1552 lines
42 KiB
ArmAsm
1552 lines
42 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Boot code and exception vectors for Book3E processors
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*
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* Copyright (C) 2007 Ben. Herrenschmidt (benh@kernel.crashing.org), IBM Corp.
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*/
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#include <linux/threads.h>
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#include <asm/reg.h>
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#include <asm/page.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/cputable.h>
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#include <asm/setup.h>
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#include <asm/thread_info.h>
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#include <asm/reg_a2.h>
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#include <asm/exception-64e.h>
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#include <asm/bug.h>
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#include <asm/irqflags.h>
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#include <asm/ptrace.h>
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#include <asm/ppc-opcode.h>
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#include <asm/mmu.h>
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#include <asm/hw_irq.h>
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#include <asm/kvm_asm.h>
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#include <asm/kvm_booke_hv_asm.h>
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#include <asm/feature-fixups.h>
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#include <asm/context_tracking.h>
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/* 64e interrupt returns always use SRR registers */
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#define fast_interrupt_return fast_interrupt_return_srr
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#define interrupt_return interrupt_return_srr
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/* XXX This will ultimately add space for a special exception save
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* structure used to save things like SRR0/SRR1, SPRGs, MAS, etc...
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* when taking special interrupts. For now we don't support that,
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* special interrupts from within a non-standard level will probably
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* blow you up
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*/
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#define SPECIAL_EXC_SRR0 0
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#define SPECIAL_EXC_SRR1 1
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#define SPECIAL_EXC_SPRG_GEN 2
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#define SPECIAL_EXC_SPRG_TLB 3
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#define SPECIAL_EXC_MAS0 4
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#define SPECIAL_EXC_MAS1 5
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#define SPECIAL_EXC_MAS2 6
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#define SPECIAL_EXC_MAS3 7
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#define SPECIAL_EXC_MAS6 8
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#define SPECIAL_EXC_MAS7 9
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#define SPECIAL_EXC_MAS5 10 /* E.HV only */
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#define SPECIAL_EXC_MAS8 11 /* E.HV only */
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#define SPECIAL_EXC_IRQHAPPENED 12
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#define SPECIAL_EXC_DEAR 13
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#define SPECIAL_EXC_ESR 14
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#define SPECIAL_EXC_SOFTE 15
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#define SPECIAL_EXC_CSRR0 16
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#define SPECIAL_EXC_CSRR1 17
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/* must be even to keep 16-byte stack alignment */
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#define SPECIAL_EXC_END 18
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#define SPECIAL_EXC_FRAME_SIZE (INT_FRAME_SIZE + SPECIAL_EXC_END * 8)
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#define SPECIAL_EXC_FRAME_OFFS (INT_FRAME_SIZE - 288)
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#define SPECIAL_EXC_STORE(reg, name) \
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std reg, (SPECIAL_EXC_##name * 8 + SPECIAL_EXC_FRAME_OFFS)(r1)
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#define SPECIAL_EXC_LOAD(reg, name) \
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ld reg, (SPECIAL_EXC_##name * 8 + SPECIAL_EXC_FRAME_OFFS)(r1)
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special_reg_save:
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/*
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* We only need (or have stack space) to save this stuff if
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* we interrupted the kernel.
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*/
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ld r3,_MSR(r1)
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andi. r3,r3,MSR_PR
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bnelr
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/*
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* Advance to the next TLB exception frame for handler
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* types that don't do it automatically.
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*/
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LOAD_REG_ADDR(r11,extlb_level_exc)
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lwz r12,0(r11)
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mfspr r10,SPRN_SPRG_TLB_EXFRAME
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add r10,r10,r12
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mtspr SPRN_SPRG_TLB_EXFRAME,r10
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/*
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* Save registers needed to allow nesting of certain exceptions
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* (such as TLB misses) inside special exception levels
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*/
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mfspr r10,SPRN_SRR0
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SPECIAL_EXC_STORE(r10,SRR0)
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mfspr r10,SPRN_SRR1
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SPECIAL_EXC_STORE(r10,SRR1)
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mfspr r10,SPRN_SPRG_GEN_SCRATCH
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SPECIAL_EXC_STORE(r10,SPRG_GEN)
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mfspr r10,SPRN_SPRG_TLB_SCRATCH
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SPECIAL_EXC_STORE(r10,SPRG_TLB)
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mfspr r10,SPRN_MAS0
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SPECIAL_EXC_STORE(r10,MAS0)
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mfspr r10,SPRN_MAS1
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SPECIAL_EXC_STORE(r10,MAS1)
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mfspr r10,SPRN_MAS2
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SPECIAL_EXC_STORE(r10,MAS2)
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mfspr r10,SPRN_MAS3
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SPECIAL_EXC_STORE(r10,MAS3)
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mfspr r10,SPRN_MAS6
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SPECIAL_EXC_STORE(r10,MAS6)
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mfspr r10,SPRN_MAS7
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SPECIAL_EXC_STORE(r10,MAS7)
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BEGIN_FTR_SECTION
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mfspr r10,SPRN_MAS5
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SPECIAL_EXC_STORE(r10,MAS5)
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mfspr r10,SPRN_MAS8
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SPECIAL_EXC_STORE(r10,MAS8)
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/* MAS5/8 could have inappropriate values if we interrupted KVM code */
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li r10,0
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mtspr SPRN_MAS5,r10
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mtspr SPRN_MAS8,r10
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END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
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mfspr r10,SPRN_DEAR
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SPECIAL_EXC_STORE(r10,DEAR)
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mfspr r10,SPRN_ESR
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SPECIAL_EXC_STORE(r10,ESR)
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ld r10,_NIP(r1)
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SPECIAL_EXC_STORE(r10,CSRR0)
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ld r10,_MSR(r1)
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SPECIAL_EXC_STORE(r10,CSRR1)
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blr
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ret_from_level_except:
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ld r3,_MSR(r1)
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andi. r3,r3,MSR_PR
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beq 1f
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REST_NVGPRS(r1)
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b interrupt_return
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1:
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LOAD_REG_ADDR(r11,extlb_level_exc)
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lwz r12,0(r11)
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mfspr r10,SPRN_SPRG_TLB_EXFRAME
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sub r10,r10,r12
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mtspr SPRN_SPRG_TLB_EXFRAME,r10
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/*
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* It's possible that the special level exception interrupted a
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* TLB miss handler, and inserted the same entry that the
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* interrupted handler was about to insert. On CPUs without TLB
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* write conditional, this can result in a duplicate TLB entry.
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* Wipe all non-bolted entries to be safe.
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*
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* Note that this doesn't protect against any TLB misses
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* we may take accessing the stack from here to the end of
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* the special level exception. It's not clear how we can
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* reasonably protect against that, but only CPUs with
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* neither TLB write conditional nor bolted kernel memory
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* are affected. Do any such CPUs even exist?
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*/
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PPC_TLBILX_ALL(0,R0)
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REST_NVGPRS(r1)
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SPECIAL_EXC_LOAD(r10,SRR0)
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mtspr SPRN_SRR0,r10
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SPECIAL_EXC_LOAD(r10,SRR1)
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mtspr SPRN_SRR1,r10
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SPECIAL_EXC_LOAD(r10,SPRG_GEN)
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mtspr SPRN_SPRG_GEN_SCRATCH,r10
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SPECIAL_EXC_LOAD(r10,SPRG_TLB)
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mtspr SPRN_SPRG_TLB_SCRATCH,r10
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SPECIAL_EXC_LOAD(r10,MAS0)
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mtspr SPRN_MAS0,r10
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SPECIAL_EXC_LOAD(r10,MAS1)
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mtspr SPRN_MAS1,r10
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SPECIAL_EXC_LOAD(r10,MAS2)
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mtspr SPRN_MAS2,r10
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SPECIAL_EXC_LOAD(r10,MAS3)
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mtspr SPRN_MAS3,r10
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SPECIAL_EXC_LOAD(r10,MAS6)
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mtspr SPRN_MAS6,r10
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SPECIAL_EXC_LOAD(r10,MAS7)
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mtspr SPRN_MAS7,r10
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BEGIN_FTR_SECTION
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SPECIAL_EXC_LOAD(r10,MAS5)
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mtspr SPRN_MAS5,r10
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SPECIAL_EXC_LOAD(r10,MAS8)
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mtspr SPRN_MAS8,r10
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END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
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SPECIAL_EXC_LOAD(r10,DEAR)
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mtspr SPRN_DEAR,r10
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SPECIAL_EXC_LOAD(r10,ESR)
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mtspr SPRN_ESR,r10
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stdcx. r0,0,r1 /* to clear the reservation */
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REST_GPRS(2, 9, r1)
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ld r10,_CTR(r1)
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ld r11,_XER(r1)
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mtctr r10
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mtxer r11
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blr
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.macro ret_from_level srr0 srr1 paca_ex scratch
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bl ret_from_level_except
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ld r10,_LINK(r1)
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ld r11,_CCR(r1)
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ld r0,GPR13(r1)
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mtlr r10
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mtcr r11
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REST_GPRS(10, 12, r1)
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mtspr \scratch,r0
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std r10,\paca_ex+EX_R10(r13);
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std r11,\paca_ex+EX_R11(r13);
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ld r10,_NIP(r1)
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ld r11,_MSR(r1)
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REST_GPR(0, r1)
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REST_GPR(1, r1)
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mtspr \srr0,r10
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mtspr \srr1,r11
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ld r10,\paca_ex+EX_R10(r13)
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ld r11,\paca_ex+EX_R11(r13)
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mfspr r13,\scratch
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.endm
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ret_from_crit_except:
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ret_from_level SPRN_CSRR0 SPRN_CSRR1 PACA_EXCRIT SPRN_SPRG_CRIT_SCRATCH
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rfci
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ret_from_mc_except:
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ret_from_level SPRN_MCSRR0 SPRN_MCSRR1 PACA_EXMC SPRN_SPRG_MC_SCRATCH
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rfmci
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/* Exception prolog code for all exceptions */
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#define EXCEPTION_PROLOG(n, intnum, type, addition) \
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mtspr SPRN_SPRG_##type##_SCRATCH,r13; /* get spare registers */ \
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mfspr r13,SPRN_SPRG_PACA; /* get PACA */ \
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std r10,PACA_EX##type+EX_R10(r13); \
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std r11,PACA_EX##type+EX_R11(r13); \
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mfcr r10; /* save CR */ \
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mfspr r11,SPRN_##type##_SRR1;/* what are we coming from */ \
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DO_KVM intnum,SPRN_##type##_SRR1; /* KVM hook */ \
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stw r10,PACA_EX##type+EX_CR(r13); /* save old CR in the PACA */ \
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addition; /* additional code for that exc. */ \
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std r1,PACA_EX##type+EX_R1(r13); /* save old r1 in the PACA */ \
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type##_SET_KSTACK; /* get special stack if necessary */\
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andi. r10,r11,MSR_PR; /* save stack pointer */ \
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beq 1f; /* branch around if supervisor */ \
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ld r1,PACAKSAVE(r13); /* get kernel stack coming from usr */\
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1: type##_BTB_FLUSH \
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cmpdi cr1,r1,0; /* check if SP makes sense */ \
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bge- cr1,exc_##n##_bad_stack;/* bad stack (TODO: out of line) */ \
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mfspr r10,SPRN_##type##_SRR0; /* read SRR0 before touching stack */
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/* Exception type-specific macros */
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#define GEN_SET_KSTACK \
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subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */
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#define SPRN_GEN_SRR0 SPRN_SRR0
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#define SPRN_GEN_SRR1 SPRN_SRR1
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#define GDBELL_SET_KSTACK GEN_SET_KSTACK
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#define SPRN_GDBELL_SRR0 SPRN_GSRR0
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#define SPRN_GDBELL_SRR1 SPRN_GSRR1
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#define CRIT_SET_KSTACK \
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ld r1,PACA_CRIT_STACK(r13); \
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subi r1,r1,SPECIAL_EXC_FRAME_SIZE
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#define SPRN_CRIT_SRR0 SPRN_CSRR0
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#define SPRN_CRIT_SRR1 SPRN_CSRR1
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#define DBG_SET_KSTACK \
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ld r1,PACA_DBG_STACK(r13); \
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subi r1,r1,SPECIAL_EXC_FRAME_SIZE
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#define SPRN_DBG_SRR0 SPRN_DSRR0
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#define SPRN_DBG_SRR1 SPRN_DSRR1
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#define MC_SET_KSTACK \
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ld r1,PACA_MC_STACK(r13); \
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subi r1,r1,SPECIAL_EXC_FRAME_SIZE
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#define SPRN_MC_SRR0 SPRN_MCSRR0
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#define SPRN_MC_SRR1 SPRN_MCSRR1
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#define GEN_BTB_FLUSH \
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START_BTB_FLUSH_SECTION \
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beq 1f; \
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BTB_FLUSH(r10) \
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1: \
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END_BTB_FLUSH_SECTION
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#define CRIT_BTB_FLUSH \
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START_BTB_FLUSH_SECTION \
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BTB_FLUSH(r10) \
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END_BTB_FLUSH_SECTION
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#define DBG_BTB_FLUSH CRIT_BTB_FLUSH
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#define MC_BTB_FLUSH CRIT_BTB_FLUSH
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#define GDBELL_BTB_FLUSH GEN_BTB_FLUSH
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#define NORMAL_EXCEPTION_PROLOG(n, intnum, addition) \
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EXCEPTION_PROLOG(n, intnum, GEN, addition##_GEN(n))
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#define CRIT_EXCEPTION_PROLOG(n, intnum, addition) \
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EXCEPTION_PROLOG(n, intnum, CRIT, addition##_CRIT(n))
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#define DBG_EXCEPTION_PROLOG(n, intnum, addition) \
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EXCEPTION_PROLOG(n, intnum, DBG, addition##_DBG(n))
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#define MC_EXCEPTION_PROLOG(n, intnum, addition) \
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EXCEPTION_PROLOG(n, intnum, MC, addition##_MC(n))
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#define GDBELL_EXCEPTION_PROLOG(n, intnum, addition) \
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EXCEPTION_PROLOG(n, intnum, GDBELL, addition##_GDBELL(n))
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/* Variants of the "addition" argument for the prolog
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*/
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#define PROLOG_ADDITION_NONE_GEN(n)
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#define PROLOG_ADDITION_NONE_GDBELL(n)
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#define PROLOG_ADDITION_NONE_CRIT(n)
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#define PROLOG_ADDITION_NONE_DBG(n)
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#define PROLOG_ADDITION_NONE_MC(n)
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#define PROLOG_ADDITION_MASKABLE_GEN(n) \
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lbz r10,PACAIRQSOFTMASK(r13); /* are irqs soft-masked? */ \
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andi. r10,r10,IRQS_DISABLED; /* yes -> go out of line */ \
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bne masked_interrupt_book3e_##n
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/*
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* Additional regs must be re-loaded from paca before EXCEPTION_COMMON* is
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* called, because that does SAVE_NVGPRS which must see the original register
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* values, otherwise the scratch values might be restored when exiting the
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* interrupt.
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*/
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#define PROLOG_ADDITION_2REGS_GEN(n) \
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std r14,PACA_EXGEN+EX_R14(r13); \
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std r15,PACA_EXGEN+EX_R15(r13)
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#define PROLOG_ADDITION_1REG_GEN(n) \
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std r14,PACA_EXGEN+EX_R14(r13);
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#define PROLOG_ADDITION_2REGS_CRIT(n) \
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std r14,PACA_EXCRIT+EX_R14(r13); \
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std r15,PACA_EXCRIT+EX_R15(r13)
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#define PROLOG_ADDITION_2REGS_DBG(n) \
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std r14,PACA_EXDBG+EX_R14(r13); \
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std r15,PACA_EXDBG+EX_R15(r13)
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#define PROLOG_ADDITION_2REGS_MC(n) \
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std r14,PACA_EXMC+EX_R14(r13); \
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std r15,PACA_EXMC+EX_R15(r13)
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/* Core exception code for all exceptions except TLB misses. */
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#define EXCEPTION_COMMON_LVL(n, scratch, excf) \
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exc_##n##_common: \
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SAVE_GPR(0, r1); /* save r0 in stackframe */ \
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SAVE_GPRS(2, 9, r1); /* save r2 - r9 in stackframe */ \
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std r10,_NIP(r1); /* save SRR0 to stackframe */ \
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std r11,_MSR(r1); /* save SRR1 to stackframe */ \
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beq 2f; /* if from kernel mode */ \
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2: ld r3,excf+EX_R10(r13); /* get back r10 */ \
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ld r4,excf+EX_R11(r13); /* get back r11 */ \
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mfspr r5,scratch; /* get back r13 */ \
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SAVE_GPR(12, r1); /* save r12 in stackframe */ \
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LOAD_PACA_TOC(); /* get kernel TOC into r2 */ \
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mflr r6; /* save LR in stackframe */ \
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mfctr r7; /* save CTR in stackframe */ \
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mfspr r8,SPRN_XER; /* save XER in stackframe */ \
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ld r9,excf+EX_R1(r13); /* load orig r1 back from PACA */ \
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lwz r10,excf+EX_CR(r13); /* load orig CR back from PACA */ \
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lbz r11,PACAIRQSOFTMASK(r13); /* get current IRQ softe */ \
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LOAD_REG_IMMEDIATE(r12, STACK_FRAME_REGS_MARKER); \
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ZEROIZE_GPR(0); \
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std r3,GPR10(r1); /* save r10 to stackframe */ \
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std r4,GPR11(r1); /* save r11 to stackframe */ \
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std r5,GPR13(r1); /* save it to stackframe */ \
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std r6,_LINK(r1); \
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std r7,_CTR(r1); \
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std r8,_XER(r1); \
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li r3,(n); /* regs.trap vector */ \
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std r9,0(r1); /* store stack frame back link */ \
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std r10,_CCR(r1); /* store orig CR in stackframe */ \
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std r9,GPR1(r1); /* store stack frame back link */ \
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std r11,SOFTE(r1); /* and save it to stackframe */ \
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std r12,STACK_INT_FRAME_MARKER(r1); /* mark the frame */ \
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std r3,_TRAP(r1); /* set trap number */ \
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std r0,RESULT(r1); /* clear regs->result */ \
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SAVE_NVGPRS(r1); \
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SANITIZE_NVGPRS(); /* minimise speculation influence */
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#define EXCEPTION_COMMON(n) \
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EXCEPTION_COMMON_LVL(n, SPRN_SPRG_GEN_SCRATCH, PACA_EXGEN)
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#define EXCEPTION_COMMON_CRIT(n) \
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EXCEPTION_COMMON_LVL(n, SPRN_SPRG_CRIT_SCRATCH, PACA_EXCRIT)
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#define EXCEPTION_COMMON_MC(n) \
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EXCEPTION_COMMON_LVL(n, SPRN_SPRG_MC_SCRATCH, PACA_EXMC)
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#define EXCEPTION_COMMON_DBG(n) \
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EXCEPTION_COMMON_LVL(n, SPRN_SPRG_DBG_SCRATCH, PACA_EXDBG)
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/* XXX FIXME: Restore r14/r15 when necessary */
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#define BAD_STACK_TRAMPOLINE(n) \
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|
exc_##n##_bad_stack: \
|
|
li r1,(n); /* get exception number */ \
|
|
sth r1,PACA_TRAP_SAVE(r13); /* store trap */ \
|
|
b bad_stack_book3e; /* bad stack error */
|
|
|
|
/* WARNING: If you change the layout of this stub, make sure you check
|
|
* the debug exception handler which handles single stepping
|
|
* into exceptions from userspace, and the MM code in
|
|
* arch/powerpc/mm/tlb_nohash.c which patches the branch here
|
|
* and would need to be updated if that branch is moved
|
|
*/
|
|
#define EXCEPTION_STUB(loc, label) \
|
|
. = interrupt_base_book3e + loc; \
|
|
nop; /* To make debug interrupts happy */ \
|
|
b exc_##label##_book3e;
|
|
|
|
#define ACK_NONE(r)
|
|
#define ACK_DEC(r) \
|
|
lis r,TSR_DIS@h; \
|
|
mtspr SPRN_TSR,r
|
|
#define ACK_FIT(r) \
|
|
lis r,TSR_FIS@h; \
|
|
mtspr SPRN_TSR,r
|
|
|
|
/* Used by asynchronous interrupt that may happen in the idle loop.
|
|
*
|
|
* This check if the thread was in the idle loop, and if yes, returns
|
|
* to the caller rather than the PC. This is to avoid a race if
|
|
* interrupts happen before the wait instruction.
|
|
*/
|
|
#define CHECK_NAPPING() \
|
|
ld r11, PACA_THREAD_INFO(r13); \
|
|
ld r10,TI_LOCAL_FLAGS(r11); \
|
|
andi. r9,r10,_TLF_NAPPING; \
|
|
beq+ 1f; \
|
|
ld r8,_LINK(r1); \
|
|
rlwinm r7,r10,0,~_TLF_NAPPING; \
|
|
std r8,_NIP(r1); \
|
|
std r7,TI_LOCAL_FLAGS(r11); \
|
|
1:
|
|
|
|
|
|
#define MASKABLE_EXCEPTION(trapnum, intnum, label, hdlr, ack) \
|
|
START_EXCEPTION(label); \
|
|
NORMAL_EXCEPTION_PROLOG(trapnum, intnum, PROLOG_ADDITION_MASKABLE)\
|
|
EXCEPTION_COMMON(trapnum) \
|
|
ack(r8); \
|
|
CHECK_NAPPING(); \
|
|
addi r3,r1,STACK_INT_FRAME_REGS; \
|
|
bl hdlr; \
|
|
b interrupt_return
|
|
|
|
/*
|
|
* And here we have the exception vectors !
|
|
*/
|
|
|
|
.text
|
|
.balign 0x1000
|
|
.globl interrupt_base_book3e
|
|
interrupt_base_book3e: /* fake trap */
|
|
EXCEPTION_STUB(0x000, machine_check)
|
|
EXCEPTION_STUB(0x020, critical_input) /* 0x0100 */
|
|
EXCEPTION_STUB(0x040, debug_crit) /* 0x0d00 */
|
|
EXCEPTION_STUB(0x060, data_storage) /* 0x0300 */
|
|
EXCEPTION_STUB(0x080, instruction_storage) /* 0x0400 */
|
|
EXCEPTION_STUB(0x0a0, external_input) /* 0x0500 */
|
|
EXCEPTION_STUB(0x0c0, alignment) /* 0x0600 */
|
|
EXCEPTION_STUB(0x0e0, program) /* 0x0700 */
|
|
EXCEPTION_STUB(0x100, fp_unavailable) /* 0x0800 */
|
|
EXCEPTION_STUB(0x120, system_call) /* 0x0c00 */
|
|
EXCEPTION_STUB(0x140, ap_unavailable) /* 0x0f20 */
|
|
EXCEPTION_STUB(0x160, decrementer) /* 0x0900 */
|
|
EXCEPTION_STUB(0x180, fixed_interval) /* 0x0980 */
|
|
EXCEPTION_STUB(0x1a0, watchdog) /* 0x09f0 */
|
|
EXCEPTION_STUB(0x1c0, data_tlb_miss)
|
|
EXCEPTION_STUB(0x1e0, instruction_tlb_miss)
|
|
EXCEPTION_STUB(0x200, altivec_unavailable)
|
|
EXCEPTION_STUB(0x220, altivec_assist)
|
|
EXCEPTION_STUB(0x260, perfmon)
|
|
EXCEPTION_STUB(0x280, doorbell)
|
|
EXCEPTION_STUB(0x2a0, doorbell_crit)
|
|
EXCEPTION_STUB(0x2c0, guest_doorbell)
|
|
EXCEPTION_STUB(0x2e0, guest_doorbell_crit)
|
|
EXCEPTION_STUB(0x300, hypercall)
|
|
EXCEPTION_STUB(0x320, ehpriv)
|
|
EXCEPTION_STUB(0x340, lrat_error)
|
|
|
|
.globl __end_interrupts
|
|
__end_interrupts:
|
|
|
|
/* Critical Input Interrupt */
|
|
START_EXCEPTION(critical_input);
|
|
CRIT_EXCEPTION_PROLOG(0x100, BOOKE_INTERRUPT_CRITICAL,
|
|
PROLOG_ADDITION_NONE)
|
|
EXCEPTION_COMMON_CRIT(0x100)
|
|
bl special_reg_save
|
|
CHECK_NAPPING();
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl unknown_nmi_exception
|
|
b ret_from_crit_except
|
|
|
|
/* Machine Check Interrupt */
|
|
START_EXCEPTION(machine_check);
|
|
MC_EXCEPTION_PROLOG(0x000, BOOKE_INTERRUPT_MACHINE_CHECK,
|
|
PROLOG_ADDITION_NONE)
|
|
EXCEPTION_COMMON_MC(0x000)
|
|
bl special_reg_save
|
|
CHECK_NAPPING();
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl machine_check_exception
|
|
b ret_from_mc_except
|
|
|
|
/* Data Storage Interrupt */
|
|
START_EXCEPTION(data_storage)
|
|
NORMAL_EXCEPTION_PROLOG(0x300, BOOKE_INTERRUPT_DATA_STORAGE,
|
|
PROLOG_ADDITION_2REGS)
|
|
mfspr r14,SPRN_DEAR
|
|
mfspr r15,SPRN_ESR
|
|
std r14,_DEAR(r1)
|
|
std r15,_ESR(r1)
|
|
ld r14,PACA_EXGEN+EX_R14(r13)
|
|
ld r15,PACA_EXGEN+EX_R15(r13)
|
|
EXCEPTION_COMMON(0x300)
|
|
b storage_fault_common
|
|
|
|
/* Instruction Storage Interrupt */
|
|
START_EXCEPTION(instruction_storage);
|
|
NORMAL_EXCEPTION_PROLOG(0x400, BOOKE_INTERRUPT_INST_STORAGE,
|
|
PROLOG_ADDITION_2REGS)
|
|
li r15,0
|
|
mr r14,r10
|
|
std r14,_DEAR(r1)
|
|
std r15,_ESR(r1)
|
|
ld r14,PACA_EXGEN+EX_R14(r13)
|
|
ld r15,PACA_EXGEN+EX_R15(r13)
|
|
EXCEPTION_COMMON(0x400)
|
|
b storage_fault_common
|
|
|
|
/* External Input Interrupt */
|
|
MASKABLE_EXCEPTION(0x500, BOOKE_INTERRUPT_EXTERNAL,
|
|
external_input, do_IRQ, ACK_NONE)
|
|
|
|
/* Alignment */
|
|
START_EXCEPTION(alignment);
|
|
NORMAL_EXCEPTION_PROLOG(0x600, BOOKE_INTERRUPT_ALIGNMENT,
|
|
PROLOG_ADDITION_2REGS)
|
|
mfspr r14,SPRN_DEAR
|
|
mfspr r15,SPRN_ESR
|
|
std r14,_DEAR(r1)
|
|
std r15,_ESR(r1)
|
|
ld r14,PACA_EXGEN+EX_R14(r13)
|
|
ld r15,PACA_EXGEN+EX_R15(r13)
|
|
EXCEPTION_COMMON(0x600)
|
|
b alignment_more /* no room, go out of line */
|
|
|
|
/* Program Interrupt */
|
|
START_EXCEPTION(program);
|
|
NORMAL_EXCEPTION_PROLOG(0x700, BOOKE_INTERRUPT_PROGRAM,
|
|
PROLOG_ADDITION_1REG)
|
|
mfspr r14,SPRN_ESR
|
|
std r14,_ESR(r1)
|
|
ld r14,PACA_EXGEN+EX_R14(r13)
|
|
EXCEPTION_COMMON(0x700)
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl program_check_exception
|
|
REST_NVGPRS(r1)
|
|
b interrupt_return
|
|
|
|
/* Floating Point Unavailable Interrupt */
|
|
START_EXCEPTION(fp_unavailable);
|
|
NORMAL_EXCEPTION_PROLOG(0x800, BOOKE_INTERRUPT_FP_UNAVAIL,
|
|
PROLOG_ADDITION_NONE)
|
|
/* we can probably do a shorter exception entry for that one... */
|
|
EXCEPTION_COMMON(0x800)
|
|
ld r12,_MSR(r1)
|
|
andi. r0,r12,MSR_PR;
|
|
beq- 1f
|
|
bl load_up_fpu
|
|
b fast_interrupt_return
|
|
1: addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl kernel_fp_unavailable_exception
|
|
b interrupt_return
|
|
|
|
/* Altivec Unavailable Interrupt */
|
|
START_EXCEPTION(altivec_unavailable);
|
|
NORMAL_EXCEPTION_PROLOG(0x200, BOOKE_INTERRUPT_ALTIVEC_UNAVAIL,
|
|
PROLOG_ADDITION_NONE)
|
|
/* we can probably do a shorter exception entry for that one... */
|
|
EXCEPTION_COMMON(0x200)
|
|
#ifdef CONFIG_ALTIVEC
|
|
BEGIN_FTR_SECTION
|
|
ld r12,_MSR(r1)
|
|
andi. r0,r12,MSR_PR;
|
|
beq- 1f
|
|
bl load_up_altivec
|
|
b fast_interrupt_return
|
|
1:
|
|
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
|
|
#endif
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl altivec_unavailable_exception
|
|
b interrupt_return
|
|
|
|
/* AltiVec Assist */
|
|
START_EXCEPTION(altivec_assist);
|
|
NORMAL_EXCEPTION_PROLOG(0x220,
|
|
BOOKE_INTERRUPT_ALTIVEC_ASSIST,
|
|
PROLOG_ADDITION_NONE)
|
|
EXCEPTION_COMMON(0x220)
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
#ifdef CONFIG_ALTIVEC
|
|
BEGIN_FTR_SECTION
|
|
bl altivec_assist_exception
|
|
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
|
|
REST_NVGPRS(r1)
|
|
#else
|
|
bl unknown_exception
|
|
#endif
|
|
b interrupt_return
|
|
|
|
|
|
/* Decrementer Interrupt */
|
|
MASKABLE_EXCEPTION(0x900, BOOKE_INTERRUPT_DECREMENTER,
|
|
decrementer, timer_interrupt, ACK_DEC)
|
|
|
|
/* Fixed Interval Timer Interrupt */
|
|
MASKABLE_EXCEPTION(0x980, BOOKE_INTERRUPT_FIT,
|
|
fixed_interval, unknown_exception, ACK_FIT)
|
|
|
|
/* Watchdog Timer Interrupt */
|
|
START_EXCEPTION(watchdog);
|
|
CRIT_EXCEPTION_PROLOG(0x9f0, BOOKE_INTERRUPT_WATCHDOG,
|
|
PROLOG_ADDITION_NONE)
|
|
EXCEPTION_COMMON_CRIT(0x9f0)
|
|
bl special_reg_save
|
|
CHECK_NAPPING();
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
#ifdef CONFIG_BOOKE_WDT
|
|
bl WatchdogException
|
|
#else
|
|
bl unknown_nmi_exception
|
|
#endif
|
|
b ret_from_crit_except
|
|
|
|
/* System Call Interrupt */
|
|
START_EXCEPTION(system_call)
|
|
mr r9,r13 /* keep a copy of userland r13 */
|
|
mfspr r11,SPRN_SRR0 /* get return address */
|
|
mfspr r12,SPRN_SRR1 /* get previous MSR */
|
|
mfspr r13,SPRN_SPRG_PACA /* get our PACA */
|
|
b system_call_common
|
|
|
|
/* Auxiliary Processor Unavailable Interrupt */
|
|
START_EXCEPTION(ap_unavailable);
|
|
NORMAL_EXCEPTION_PROLOG(0xf20, BOOKE_INTERRUPT_AP_UNAVAIL,
|
|
PROLOG_ADDITION_NONE)
|
|
EXCEPTION_COMMON(0xf20)
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl unknown_exception
|
|
b interrupt_return
|
|
|
|
/* Debug exception as a critical interrupt*/
|
|
START_EXCEPTION(debug_crit);
|
|
CRIT_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG,
|
|
PROLOG_ADDITION_2REGS)
|
|
|
|
/*
|
|
* If there is a single step or branch-taken exception in an
|
|
* exception entry sequence, it was probably meant to apply to
|
|
* the code where the exception occurred (since exception entry
|
|
* doesn't turn off DE automatically). We simulate the effect
|
|
* of turning off DE on entry to an exception handler by turning
|
|
* off DE in the CSRR1 value and clearing the debug status.
|
|
*/
|
|
|
|
mfspr r14,SPRN_DBSR /* check single-step/branch taken */
|
|
andis. r15,r14,(DBSR_IC|DBSR_BT)@h
|
|
beq+ 1f
|
|
|
|
#ifdef CONFIG_RELOCATABLE
|
|
__LOAD_PACA_TOC(r15)
|
|
LOAD_REG_ADDR_ALTTOC(r14, r15, interrupt_base_book3e)
|
|
LOAD_REG_ADDR_ALTTOC(r15, r15, __end_interrupts)
|
|
cmpld cr0,r10,r14
|
|
cmpld cr1,r10,r15
|
|
#else
|
|
LOAD_REG_IMMEDIATE_SYM(r14, r15, interrupt_base_book3e)
|
|
cmpld cr0, r10, r14
|
|
LOAD_REG_IMMEDIATE_SYM(r14, r15, __end_interrupts)
|
|
cmpld cr1, r10, r14
|
|
#endif
|
|
blt+ cr0,1f
|
|
bge+ cr1,1f
|
|
|
|
/* here it looks like we got an inappropriate debug exception. */
|
|
lis r14,(DBSR_IC|DBSR_BT)@h /* clear the event */
|
|
rlwinm r11,r11,0,~MSR_DE /* clear DE in the CSRR1 value */
|
|
mtspr SPRN_DBSR,r14
|
|
mtspr SPRN_CSRR1,r11
|
|
lwz r10,PACA_EXCRIT+EX_CR(r13) /* restore registers */
|
|
ld r1,PACA_EXCRIT+EX_R1(r13)
|
|
ld r14,PACA_EXCRIT+EX_R14(r13)
|
|
ld r15,PACA_EXCRIT+EX_R15(r13)
|
|
mtcr r10
|
|
ld r10,PACA_EXCRIT+EX_R10(r13) /* restore registers */
|
|
ld r11,PACA_EXCRIT+EX_R11(r13)
|
|
mfspr r13,SPRN_SPRG_CRIT_SCRATCH
|
|
rfci
|
|
|
|
/* Normal debug exception */
|
|
/* XXX We only handle coming from userspace for now since we can't
|
|
* quite save properly an interrupted kernel state yet
|
|
*/
|
|
1: andi. r14,r11,MSR_PR; /* check for userspace again */
|
|
beq kernel_dbg_exc; /* if from kernel mode */
|
|
|
|
/* Now we mash up things to make it look like we are coming on a
|
|
* normal exception
|
|
*/
|
|
mfspr r14,SPRN_DBSR
|
|
std r14,_DSISR(r1)
|
|
ld r14,PACA_EXCRIT+EX_R14(r13)
|
|
ld r15,PACA_EXCRIT+EX_R15(r13)
|
|
EXCEPTION_COMMON_CRIT(0xd00)
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl DebugException
|
|
REST_NVGPRS(r1)
|
|
b interrupt_return
|
|
|
|
kernel_dbg_exc:
|
|
b . /* NYI */
|
|
|
|
/* Debug exception as a debug interrupt*/
|
|
START_EXCEPTION(debug_debug);
|
|
DBG_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG,
|
|
PROLOG_ADDITION_2REGS)
|
|
|
|
/*
|
|
* If there is a single step or branch-taken exception in an
|
|
* exception entry sequence, it was probably meant to apply to
|
|
* the code where the exception occurred (since exception entry
|
|
* doesn't turn off DE automatically). We simulate the effect
|
|
* of turning off DE on entry to an exception handler by turning
|
|
* off DE in the DSRR1 value and clearing the debug status.
|
|
*/
|
|
|
|
mfspr r14,SPRN_DBSR /* check single-step/branch taken */
|
|
andis. r15,r14,(DBSR_IC|DBSR_BT)@h
|
|
beq+ 1f
|
|
|
|
#ifdef CONFIG_RELOCATABLE
|
|
__LOAD_PACA_TOC(r15)
|
|
LOAD_REG_ADDR_ALTTOC(r14, r15, interrupt_base_book3e)
|
|
LOAD_REG_ADDR_ALTTOC(r15, r15, __end_interrupts)
|
|
cmpld cr0,r10,r14
|
|
cmpld cr1,r10,r15
|
|
#else
|
|
LOAD_REG_IMMEDIATE_SYM(r14, r15, interrupt_base_book3e)
|
|
cmpld cr0, r10, r14
|
|
LOAD_REG_IMMEDIATE_SYM(r14, r15,__end_interrupts)
|
|
cmpld cr1, r10, r14
|
|
#endif
|
|
blt+ cr0,1f
|
|
bge+ cr1,1f
|
|
|
|
/* here it looks like we got an inappropriate debug exception. */
|
|
lis r14,(DBSR_IC|DBSR_BT)@h /* clear the event */
|
|
rlwinm r11,r11,0,~MSR_DE /* clear DE in the DSRR1 value */
|
|
mtspr SPRN_DBSR,r14
|
|
mtspr SPRN_DSRR1,r11
|
|
lwz r10,PACA_EXDBG+EX_CR(r13) /* restore registers */
|
|
ld r1,PACA_EXDBG+EX_R1(r13)
|
|
ld r14,PACA_EXDBG+EX_R14(r13)
|
|
ld r15,PACA_EXDBG+EX_R15(r13)
|
|
mtcr r10
|
|
ld r10,PACA_EXDBG+EX_R10(r13) /* restore registers */
|
|
ld r11,PACA_EXDBG+EX_R11(r13)
|
|
mfspr r13,SPRN_SPRG_DBG_SCRATCH
|
|
rfdi
|
|
|
|
/* Normal debug exception */
|
|
/* XXX We only handle coming from userspace for now since we can't
|
|
* quite save properly an interrupted kernel state yet
|
|
*/
|
|
1: andi. r14,r11,MSR_PR; /* check for userspace again */
|
|
beq kernel_dbg_exc; /* if from kernel mode */
|
|
|
|
/* Now we mash up things to make it look like we are coming on a
|
|
* normal exception
|
|
*/
|
|
mfspr r14,SPRN_DBSR
|
|
std r14,_DSISR(r1)
|
|
ld r14,PACA_EXDBG+EX_R14(r13)
|
|
ld r15,PACA_EXDBG+EX_R15(r13)
|
|
EXCEPTION_COMMON_DBG(0xd08)
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl DebugException
|
|
REST_NVGPRS(r1)
|
|
b interrupt_return
|
|
|
|
START_EXCEPTION(perfmon);
|
|
NORMAL_EXCEPTION_PROLOG(0x260, BOOKE_INTERRUPT_PERFORMANCE_MONITOR,
|
|
PROLOG_ADDITION_NONE)
|
|
EXCEPTION_COMMON(0x260)
|
|
CHECK_NAPPING()
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
/*
|
|
* XXX: Returning from performance_monitor_exception taken as a
|
|
* soft-NMI (Linux irqs disabled) may be risky to use interrupt_return
|
|
* and could cause bugs in return or elsewhere. That case should just
|
|
* restore registers and return. There is a workaround for one known
|
|
* problem in interrupt_exit_kernel_prepare().
|
|
*/
|
|
bl performance_monitor_exception
|
|
b interrupt_return
|
|
|
|
/* Doorbell interrupt */
|
|
MASKABLE_EXCEPTION(0x280, BOOKE_INTERRUPT_DOORBELL,
|
|
doorbell, doorbell_exception, ACK_NONE)
|
|
|
|
/* Doorbell critical Interrupt */
|
|
START_EXCEPTION(doorbell_crit);
|
|
CRIT_EXCEPTION_PROLOG(0x2a0, BOOKE_INTERRUPT_DOORBELL_CRITICAL,
|
|
PROLOG_ADDITION_NONE)
|
|
EXCEPTION_COMMON_CRIT(0x2a0)
|
|
bl special_reg_save
|
|
CHECK_NAPPING();
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl unknown_nmi_exception
|
|
b ret_from_crit_except
|
|
|
|
/*
|
|
* Guest doorbell interrupt
|
|
* This general exception use GSRRx save/restore registers
|
|
*/
|
|
START_EXCEPTION(guest_doorbell);
|
|
GDBELL_EXCEPTION_PROLOG(0x2c0, BOOKE_INTERRUPT_GUEST_DBELL,
|
|
PROLOG_ADDITION_NONE)
|
|
EXCEPTION_COMMON(0x2c0)
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl unknown_exception
|
|
b interrupt_return
|
|
|
|
/* Guest Doorbell critical Interrupt */
|
|
START_EXCEPTION(guest_doorbell_crit);
|
|
CRIT_EXCEPTION_PROLOG(0x2e0, BOOKE_INTERRUPT_GUEST_DBELL_CRIT,
|
|
PROLOG_ADDITION_NONE)
|
|
EXCEPTION_COMMON_CRIT(0x2e0)
|
|
bl special_reg_save
|
|
CHECK_NAPPING();
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl unknown_nmi_exception
|
|
b ret_from_crit_except
|
|
|
|
/* Hypervisor call */
|
|
START_EXCEPTION(hypercall);
|
|
NORMAL_EXCEPTION_PROLOG(0x310, BOOKE_INTERRUPT_HV_SYSCALL,
|
|
PROLOG_ADDITION_NONE)
|
|
EXCEPTION_COMMON(0x310)
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl unknown_exception
|
|
b interrupt_return
|
|
|
|
/* Embedded Hypervisor priviledged */
|
|
START_EXCEPTION(ehpriv);
|
|
NORMAL_EXCEPTION_PROLOG(0x320, BOOKE_INTERRUPT_HV_PRIV,
|
|
PROLOG_ADDITION_NONE)
|
|
EXCEPTION_COMMON(0x320)
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl unknown_exception
|
|
b interrupt_return
|
|
|
|
/* LRAT Error interrupt */
|
|
START_EXCEPTION(lrat_error);
|
|
NORMAL_EXCEPTION_PROLOG(0x340, BOOKE_INTERRUPT_LRAT_ERROR,
|
|
PROLOG_ADDITION_NONE)
|
|
EXCEPTION_COMMON(0x340)
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl unknown_exception
|
|
b interrupt_return
|
|
|
|
.macro SEARCH_RESTART_TABLE
|
|
#ifdef CONFIG_RELOCATABLE
|
|
__LOAD_PACA_TOC(r11)
|
|
LOAD_REG_ADDR_ALTTOC(r14, r11, __start___restart_table)
|
|
LOAD_REG_ADDR_ALTTOC(r15, r11, __stop___restart_table)
|
|
#else
|
|
LOAD_REG_IMMEDIATE_SYM(r14, r11, __start___restart_table)
|
|
LOAD_REG_IMMEDIATE_SYM(r15, r11, __stop___restart_table)
|
|
#endif
|
|
300:
|
|
cmpd r14,r15
|
|
beq 302f
|
|
ld r11,0(r14)
|
|
cmpld r10,r11
|
|
blt 301f
|
|
ld r11,8(r14)
|
|
cmpld r10,r11
|
|
bge 301f
|
|
ld r11,16(r14)
|
|
b 303f
|
|
301:
|
|
addi r14,r14,24
|
|
b 300b
|
|
302:
|
|
li r11,0
|
|
303:
|
|
.endm
|
|
|
|
/*
|
|
* An interrupt came in while soft-disabled; We mark paca->irq_happened
|
|
* accordingly and if the interrupt is level sensitive, we hard disable
|
|
* hard disable (full_mask) corresponds to PACA_IRQ_MUST_HARD_MASK, so
|
|
* keep these in synch.
|
|
*/
|
|
|
|
.macro masked_interrupt_book3e paca_irq full_mask
|
|
std r14,PACA_EXGEN+EX_R14(r13)
|
|
std r15,PACA_EXGEN+EX_R15(r13)
|
|
|
|
lbz r10,PACAIRQHAPPENED(r13)
|
|
.if \full_mask == 1
|
|
ori r10,r10,\paca_irq | PACA_IRQ_HARD_DIS
|
|
.else
|
|
ori r10,r10,\paca_irq
|
|
.endif
|
|
stb r10,PACAIRQHAPPENED(r13)
|
|
|
|
.if \full_mask == 1
|
|
xori r11,r11,MSR_EE /* clear MSR_EE */
|
|
mtspr SPRN_SRR1,r11
|
|
.endif
|
|
|
|
mfspr r10,SPRN_SRR0
|
|
SEARCH_RESTART_TABLE
|
|
cmpdi r11,0
|
|
beq 1f
|
|
mtspr SPRN_SRR0,r11 /* return to restart address */
|
|
1:
|
|
|
|
lwz r11,PACA_EXGEN+EX_CR(r13)
|
|
mtcr r11
|
|
ld r10,PACA_EXGEN+EX_R10(r13)
|
|
ld r11,PACA_EXGEN+EX_R11(r13)
|
|
ld r14,PACA_EXGEN+EX_R14(r13)
|
|
ld r15,PACA_EXGEN+EX_R15(r13)
|
|
mfspr r13,SPRN_SPRG_GEN_SCRATCH
|
|
rfi
|
|
b .
|
|
.endm
|
|
|
|
masked_interrupt_book3e_0x500:
|
|
masked_interrupt_book3e PACA_IRQ_EE 1
|
|
|
|
masked_interrupt_book3e_0x900:
|
|
ACK_DEC(r10);
|
|
masked_interrupt_book3e PACA_IRQ_DEC 0
|
|
|
|
masked_interrupt_book3e_0x980:
|
|
ACK_FIT(r10);
|
|
masked_interrupt_book3e PACA_IRQ_DEC 0
|
|
|
|
masked_interrupt_book3e_0x280:
|
|
masked_interrupt_book3e_0x2c0:
|
|
masked_interrupt_book3e PACA_IRQ_DBELL 0
|
|
|
|
/*
|
|
* This is called from 0x300 and 0x400 handlers after the prologs with
|
|
* r14 and r15 containing the fault address and error code, with the
|
|
* original values stashed away in the PACA
|
|
*/
|
|
storage_fault_common:
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl do_page_fault
|
|
b interrupt_return
|
|
|
|
/*
|
|
* Alignment exception doesn't fit entirely in the 0x100 bytes so it
|
|
* continues here.
|
|
*/
|
|
alignment_more:
|
|
addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl alignment_exception
|
|
REST_NVGPRS(r1)
|
|
b interrupt_return
|
|
|
|
/*
|
|
* Trampolines used when spotting a bad kernel stack pointer in
|
|
* the exception entry code.
|
|
*
|
|
* TODO: move some bits like SRR0 read to trampoline, pass PACA
|
|
* index around, etc... to handle crit & mcheck
|
|
*/
|
|
BAD_STACK_TRAMPOLINE(0x000)
|
|
BAD_STACK_TRAMPOLINE(0x100)
|
|
BAD_STACK_TRAMPOLINE(0x200)
|
|
BAD_STACK_TRAMPOLINE(0x220)
|
|
BAD_STACK_TRAMPOLINE(0x260)
|
|
BAD_STACK_TRAMPOLINE(0x280)
|
|
BAD_STACK_TRAMPOLINE(0x2a0)
|
|
BAD_STACK_TRAMPOLINE(0x2c0)
|
|
BAD_STACK_TRAMPOLINE(0x2e0)
|
|
BAD_STACK_TRAMPOLINE(0x300)
|
|
BAD_STACK_TRAMPOLINE(0x310)
|
|
BAD_STACK_TRAMPOLINE(0x320)
|
|
BAD_STACK_TRAMPOLINE(0x340)
|
|
BAD_STACK_TRAMPOLINE(0x400)
|
|
BAD_STACK_TRAMPOLINE(0x500)
|
|
BAD_STACK_TRAMPOLINE(0x600)
|
|
BAD_STACK_TRAMPOLINE(0x700)
|
|
BAD_STACK_TRAMPOLINE(0x800)
|
|
BAD_STACK_TRAMPOLINE(0x900)
|
|
BAD_STACK_TRAMPOLINE(0x980)
|
|
BAD_STACK_TRAMPOLINE(0x9f0)
|
|
BAD_STACK_TRAMPOLINE(0xa00)
|
|
BAD_STACK_TRAMPOLINE(0xb00)
|
|
BAD_STACK_TRAMPOLINE(0xc00)
|
|
BAD_STACK_TRAMPOLINE(0xd00)
|
|
BAD_STACK_TRAMPOLINE(0xd08)
|
|
BAD_STACK_TRAMPOLINE(0xe00)
|
|
BAD_STACK_TRAMPOLINE(0xf00)
|
|
BAD_STACK_TRAMPOLINE(0xf20)
|
|
|
|
.globl bad_stack_book3e
|
|
bad_stack_book3e:
|
|
/* XXX: Needs to make SPRN_SPRG_GEN depend on exception type */
|
|
mfspr r10,SPRN_SRR0; /* read SRR0 before touching stack */
|
|
ld r1,PACAEMERGSP(r13)
|
|
subi r1,r1,64+INT_FRAME_SIZE
|
|
std r10,_NIP(r1)
|
|
std r11,_MSR(r1)
|
|
ld r10,PACA_EXGEN+EX_R1(r13) /* FIXME for crit & mcheck */
|
|
lwz r11,PACA_EXGEN+EX_CR(r13) /* FIXME for crit & mcheck */
|
|
std r10,GPR1(r1)
|
|
std r11,_CCR(r1)
|
|
mfspr r10,SPRN_DEAR
|
|
mfspr r11,SPRN_ESR
|
|
std r10,_DEAR(r1)
|
|
std r11,_ESR(r1)
|
|
SAVE_GPR(0, r1); /* save r0 in stackframe */ \
|
|
SAVE_GPRS(2, 9, r1); /* save r2 - r9 in stackframe */ \
|
|
ld r3,PACA_EXGEN+EX_R10(r13);/* get back r10 */ \
|
|
ld r4,PACA_EXGEN+EX_R11(r13);/* get back r11 */ \
|
|
mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 XXX can be wrong */ \
|
|
std r3,GPR10(r1); /* save r10 to stackframe */ \
|
|
std r4,GPR11(r1); /* save r11 to stackframe */ \
|
|
SAVE_GPR(12, r1); /* save r12 in stackframe */ \
|
|
std r5,GPR13(r1); /* save it to stackframe */ \
|
|
mflr r10
|
|
mfctr r11
|
|
mfxer r12
|
|
std r10,_LINK(r1)
|
|
std r11,_CTR(r1)
|
|
std r12,_XER(r1)
|
|
SAVE_NVGPRS(r1)
|
|
lhz r12,PACA_TRAP_SAVE(r13)
|
|
std r12,_TRAP(r1)
|
|
addi r11,r1,INT_FRAME_SIZE
|
|
std r11,0(r1)
|
|
ZEROIZE_GPR(12)
|
|
std r12,0(r11)
|
|
LOAD_PACA_TOC()
|
|
1: addi r3,r1,STACK_INT_FRAME_REGS
|
|
bl kernel_bad_stack
|
|
b 1b
|
|
|
|
/*
|
|
* Setup the initial TLB for a core. This current implementation
|
|
* assume that whatever we are running off will not conflict with
|
|
* the new mapping at PAGE_OFFSET.
|
|
*/
|
|
_GLOBAL(initial_tlb_book3e)
|
|
|
|
/* Look for the first TLB with IPROT set */
|
|
mfspr r4,SPRN_TLB0CFG
|
|
andi. r3,r4,TLBnCFG_IPROT
|
|
lis r3,MAS0_TLBSEL(0)@h
|
|
bne found_iprot
|
|
|
|
mfspr r4,SPRN_TLB1CFG
|
|
andi. r3,r4,TLBnCFG_IPROT
|
|
lis r3,MAS0_TLBSEL(1)@h
|
|
bne found_iprot
|
|
|
|
mfspr r4,SPRN_TLB2CFG
|
|
andi. r3,r4,TLBnCFG_IPROT
|
|
lis r3,MAS0_TLBSEL(2)@h
|
|
bne found_iprot
|
|
|
|
lis r3,MAS0_TLBSEL(3)@h
|
|
mfspr r4,SPRN_TLB3CFG
|
|
/* fall through */
|
|
|
|
found_iprot:
|
|
andi. r5,r4,TLBnCFG_HES
|
|
bne have_hes
|
|
|
|
mflr r8 /* save LR */
|
|
/* 1. Find the index of the entry we're executing in
|
|
*
|
|
* r3 = MAS0_TLBSEL (for the iprot array)
|
|
* r4 = SPRN_TLBnCFG
|
|
*/
|
|
bcl 20,31,$+4 /* Find our address */
|
|
invstr: mflr r6 /* Make it accessible */
|
|
mfmsr r7
|
|
rlwinm r5,r7,27,31,31 /* extract MSR[IS] */
|
|
mfspr r7,SPRN_PID
|
|
slwi r7,r7,16
|
|
or r7,r7,r5
|
|
mtspr SPRN_MAS6,r7
|
|
tlbsx 0,r6 /* search MSR[IS], SPID=PID */
|
|
|
|
mfspr r3,SPRN_MAS0
|
|
rlwinm r5,r3,16,20,31 /* Extract MAS0(Entry) */
|
|
|
|
mfspr r7,SPRN_MAS1 /* Insure IPROT set */
|
|
oris r7,r7,MAS1_IPROT@h
|
|
mtspr SPRN_MAS1,r7
|
|
tlbwe
|
|
|
|
/* 2. Invalidate all entries except the entry we're executing in
|
|
*
|
|
* r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
|
|
* r4 = SPRN_TLBnCFG
|
|
* r5 = ESEL of entry we are running in
|
|
*/
|
|
andi. r4,r4,TLBnCFG_N_ENTRY /* Extract # entries */
|
|
li r6,0 /* Set Entry counter to 0 */
|
|
1: mr r7,r3 /* Set MAS0(TLBSEL) */
|
|
rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */
|
|
mtspr SPRN_MAS0,r7
|
|
tlbre
|
|
mfspr r7,SPRN_MAS1
|
|
rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */
|
|
cmpw r5,r6
|
|
beq skpinv /* Dont update the current execution TLB */
|
|
mtspr SPRN_MAS1,r7
|
|
tlbwe
|
|
isync
|
|
skpinv: addi r6,r6,1 /* Increment */
|
|
cmpw r6,r4 /* Are we done? */
|
|
bne 1b /* If not, repeat */
|
|
|
|
/* Invalidate all TLBs */
|
|
PPC_TLBILX_ALL(0,R0)
|
|
sync
|
|
isync
|
|
|
|
/* 3. Setup a temp mapping and jump to it
|
|
*
|
|
* r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
|
|
* r5 = ESEL of entry we are running in
|
|
*/
|
|
andi. r7,r5,0x1 /* Find an entry not used and is non-zero */
|
|
addi r7,r7,0x1
|
|
mr r4,r3 /* Set MAS0(TLBSEL) = 1 */
|
|
mtspr SPRN_MAS0,r4
|
|
tlbre
|
|
|
|
rlwimi r4,r7,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r7) */
|
|
mtspr SPRN_MAS0,r4
|
|
|
|
mfspr r7,SPRN_MAS1
|
|
xori r6,r7,MAS1_TS /* Setup TMP mapping in the other Address space */
|
|
mtspr SPRN_MAS1,r6
|
|
|
|
tlbwe
|
|
|
|
mfmsr r6
|
|
xori r6,r6,MSR_IS
|
|
mtspr SPRN_SRR1,r6
|
|
bcl 20,31,$+4 /* Find our address */
|
|
1: mflr r6
|
|
addi r6,r6,(2f - 1b)
|
|
mtspr SPRN_SRR0,r6
|
|
rfi
|
|
2:
|
|
|
|
/* 4. Clear out PIDs & Search info
|
|
*
|
|
* r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
|
|
* r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
|
|
* r5 = MAS3
|
|
*/
|
|
li r6,0
|
|
mtspr SPRN_MAS6,r6
|
|
mtspr SPRN_PID,r6
|
|
|
|
/* 5. Invalidate mapping we started in
|
|
*
|
|
* r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
|
|
* r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
|
|
* r5 = MAS3
|
|
*/
|
|
mtspr SPRN_MAS0,r3
|
|
tlbre
|
|
mfspr r6,SPRN_MAS1
|
|
rlwinm r6,r6,0,2,31 /* clear IPROT and VALID */
|
|
mtspr SPRN_MAS1,r6
|
|
tlbwe
|
|
sync
|
|
isync
|
|
|
|
/* 6. Setup KERNELBASE mapping in TLB[0]
|
|
*
|
|
* r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
|
|
* r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
|
|
* r5 = MAS3
|
|
*/
|
|
rlwinm r3,r3,0,16,3 /* clear ESEL */
|
|
mtspr SPRN_MAS0,r3
|
|
lis r6,(MAS1_VALID|MAS1_IPROT)@h
|
|
ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_1GB))@l
|
|
mtspr SPRN_MAS1,r6
|
|
|
|
LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET | MAS2_M_IF_NEEDED)
|
|
mtspr SPRN_MAS2,r6
|
|
|
|
rlwinm r5,r5,0,0,25
|
|
ori r5,r5,MAS3_SR | MAS3_SW | MAS3_SX
|
|
mtspr SPRN_MAS3,r5
|
|
li r5,-1
|
|
rlwinm r5,r5,0,0,25
|
|
|
|
tlbwe
|
|
|
|
/* 7. Jump to KERNELBASE mapping
|
|
*
|
|
* r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
|
|
*/
|
|
/* Now we branch the new virtual address mapped by this entry */
|
|
bcl 20,31,$+4 /* Find our address */
|
|
1: mflr r6
|
|
addi r6,r6,(2f - 1b)
|
|
tovirt(r6,r6)
|
|
lis r7,MSR_KERNEL@h
|
|
ori r7,r7,MSR_KERNEL@l
|
|
mtspr SPRN_SRR0,r6
|
|
mtspr SPRN_SRR1,r7
|
|
rfi /* start execution out of TLB1[0] entry */
|
|
2:
|
|
|
|
/* 8. Clear out the temp mapping
|
|
*
|
|
* r4 = MAS0 w/TLBSEL & ESEL for the entry we are running in
|
|
*/
|
|
mtspr SPRN_MAS0,r4
|
|
tlbre
|
|
mfspr r5,SPRN_MAS1
|
|
rlwinm r5,r5,0,2,31 /* clear IPROT and VALID */
|
|
mtspr SPRN_MAS1,r5
|
|
tlbwe
|
|
sync
|
|
isync
|
|
|
|
/* We translate LR and return */
|
|
tovirt(r8,r8)
|
|
mtlr r8
|
|
blr
|
|
|
|
have_hes:
|
|
/* Setup MAS 0,1,2,3 and 7 for tlbwe of a 1G entry that maps the
|
|
* kernel linear mapping. We also set MAS8 once for all here though
|
|
* that will have to be made dependent on whether we are running under
|
|
* a hypervisor I suppose.
|
|
*/
|
|
|
|
/* BEWARE, MAGIC
|
|
* This code is called as an ordinary function on the boot CPU. But to
|
|
* avoid duplication, this code is also used in SCOM bringup of
|
|
* secondary CPUs. We read the code between the initial_tlb_code_start
|
|
* and initial_tlb_code_end labels one instruction at a time and RAM it
|
|
* into the new core via SCOM. That doesn't process branches, so there
|
|
* must be none between those two labels. It also means if this code
|
|
* ever takes any parameters, the SCOM code must also be updated to
|
|
* provide them.
|
|
*/
|
|
.globl a2_tlbinit_code_start
|
|
a2_tlbinit_code_start:
|
|
|
|
ori r11,r3,MAS0_WQ_ALLWAYS
|
|
oris r11,r11,MAS0_ESEL(3)@h /* Use way 3: workaround A2 erratum 376 */
|
|
mtspr SPRN_MAS0,r11
|
|
lis r3,(MAS1_VALID | MAS1_IPROT)@h
|
|
ori r3,r3,BOOK3E_PAGESZ_1GB << MAS1_TSIZE_SHIFT
|
|
mtspr SPRN_MAS1,r3
|
|
LOAD_REG_IMMEDIATE(r3, PAGE_OFFSET | MAS2_M)
|
|
mtspr SPRN_MAS2,r3
|
|
li r3,MAS3_SR | MAS3_SW | MAS3_SX
|
|
mtspr SPRN_MAS7_MAS3,r3
|
|
li r3,0
|
|
mtspr SPRN_MAS8,r3
|
|
|
|
/* Write the TLB entry */
|
|
tlbwe
|
|
|
|
.globl a2_tlbinit_after_linear_map
|
|
a2_tlbinit_after_linear_map:
|
|
|
|
/* Now we branch the new virtual address mapped by this entry */
|
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#ifdef CONFIG_RELOCATABLE
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__LOAD_PACA_TOC(r5)
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LOAD_REG_ADDR_ALTTOC(r3, r5, 1f)
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#else
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LOAD_REG_IMMEDIATE_SYM(r3, r5, 1f)
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#endif
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mtctr r3
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bctr
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1: /* We are now running at PAGE_OFFSET, clean the TLB of everything
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* else (including IPROTed things left by firmware)
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* r4 = TLBnCFG
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* r3 = current address (more or less)
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*/
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li r5,0
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mtspr SPRN_MAS6,r5
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tlbsx 0,r3
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rlwinm r9,r4,0,TLBnCFG_N_ENTRY
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rlwinm r10,r4,8,0xff
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addi r10,r10,-1 /* Get inner loop mask */
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li r3,1
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mfspr r5,SPRN_MAS1
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rlwinm r5,r5,0,(~(MAS1_VALID|MAS1_IPROT))
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mfspr r6,SPRN_MAS2
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rldicr r6,r6,0,51 /* Extract EPN */
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mfspr r7,SPRN_MAS0
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rlwinm r7,r7,0,0xffff0fff /* Clear HES and WQ */
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rlwinm r8,r7,16,0xfff /* Extract ESEL */
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2: add r4,r3,r8
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and r4,r4,r10
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rlwimi r7,r4,16,MAS0_ESEL_MASK
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mtspr SPRN_MAS0,r7
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mtspr SPRN_MAS1,r5
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mtspr SPRN_MAS2,r6
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tlbwe
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addi r3,r3,1
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and. r4,r3,r10
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|
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bne 3f
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addis r6,r6,(1<<30)@h
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3:
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cmpw r3,r9
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blt 2b
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.globl a2_tlbinit_after_iprot_flush
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a2_tlbinit_after_iprot_flush:
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PPC_TLBILX(0,0,R0)
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sync
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isync
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.globl a2_tlbinit_code_end
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a2_tlbinit_code_end:
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/* We translate LR and return */
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mflr r3
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tovirt(r3,r3)
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mtlr r3
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blr
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|
/*
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* Main entry (boot CPU, thread 0)
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*
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* We enter here from head_64.S, possibly after the prom_init trampoline
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* with r3 and r4 already saved to r31 and 30 respectively and in 64 bits
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* mode. Anything else is as it was left by the bootloader
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*
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* Initial requirements of this port:
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*
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* - Kernel loaded at 0 physical
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* - A good lump of memory mapped 0:0 by UTLB entry 0
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* - MSR:IS & MSR:DS set to 0
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*
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|
* Note that some of the above requirements will be relaxed in the future
|
|
* as the kernel becomes smarter at dealing with different initial conditions
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|
* but for now you have to be careful
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|
*/
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_GLOBAL(start_initialization_book3e)
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mflr r28
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|
/* First, we need to setup some initial TLBs to map the kernel
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* text, data and bss at PAGE_OFFSET. We don't have a real mode
|
|
* and always use AS 0, so we just set it up to match our link
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|
* address and never use 0 based addresses.
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*/
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bl initial_tlb_book3e
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|
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/* Init global core bits */
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|
bl init_core_book3e
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|
|
|
/* Init per-thread bits */
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|
bl init_thread_book3e
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|
|
|
/* Return to common init code */
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|
tovirt(r28,r28)
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|
mtlr r28
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|
blr
|
|
|
|
|
|
/*
|
|
* Secondary core/processor entry
|
|
*
|
|
* This is entered for thread 0 of a secondary core, all other threads
|
|
* are expected to be stopped. It's similar to start_initialization_book3e
|
|
* except that it's generally entered from the holding loop in head_64.S
|
|
* after CPUs have been gathered by Open Firmware.
|
|
*
|
|
* We assume we are in 32 bits mode running with whatever TLB entry was
|
|
* set for us by the firmware or POR engine.
|
|
*/
|
|
_GLOBAL(book3e_secondary_core_init_tlb_set)
|
|
li r4,1
|
|
b generic_secondary_smp_init
|
|
|
|
_GLOBAL(book3e_secondary_core_init)
|
|
mflr r28
|
|
|
|
/* Do we need to setup initial TLB entry ? */
|
|
cmplwi r4,0
|
|
bne 2f
|
|
|
|
/* Setup TLB for this core */
|
|
bl initial_tlb_book3e
|
|
|
|
/* We can return from the above running at a different
|
|
* address, so recalculate r2 (TOC)
|
|
*/
|
|
bl relative_toc
|
|
|
|
/* Init global core bits */
|
|
2: bl init_core_book3e
|
|
|
|
/* Init per-thread bits */
|
|
3: bl init_thread_book3e
|
|
|
|
/* Return to common init code at proper virtual address.
|
|
*
|
|
* Due to various previous assumptions, we know we entered this
|
|
* function at either the final PAGE_OFFSET mapping or using a
|
|
* 1:1 mapping at 0, so we don't bother doing a complicated check
|
|
* here, we just ensure the return address has the right top bits.
|
|
*
|
|
* Note that if we ever want to be smarter about where we can be
|
|
* started from, we have to be careful that by the time we reach
|
|
* the code below we may already be running at a different location
|
|
* than the one we were called from since initial_tlb_book3e can
|
|
* have moved us already.
|
|
*/
|
|
cmpdi cr0,r28,0
|
|
blt 1f
|
|
lis r3,PAGE_OFFSET@highest
|
|
sldi r3,r3,32
|
|
or r28,r28,r3
|
|
1: mtlr r28
|
|
blr
|
|
|
|
_GLOBAL(book3e_secondary_thread_init)
|
|
mflr r28
|
|
b 3b
|
|
|
|
.globl init_core_book3e
|
|
init_core_book3e:
|
|
/* Establish the interrupt vector base */
|
|
tovirt(r2,r2)
|
|
LOAD_REG_ADDR(r3, interrupt_base_book3e)
|
|
mtspr SPRN_IVPR,r3
|
|
sync
|
|
blr
|
|
|
|
init_thread_book3e:
|
|
lis r3,(SPRN_EPCR_ICM | SPRN_EPCR_GICM)@h
|
|
mtspr SPRN_EPCR,r3
|
|
|
|
/* Make sure interrupts are off */
|
|
wrteei 0
|
|
|
|
/* disable all timers and clear out status */
|
|
li r3,0
|
|
mtspr SPRN_TCR,r3
|
|
mfspr r3,SPRN_TSR
|
|
mtspr SPRN_TSR,r3
|
|
|
|
blr
|
|
|
|
_GLOBAL(__setup_base_ivors)
|
|
SET_IVOR(0, 0x020) /* Critical Input */
|
|
SET_IVOR(1, 0x000) /* Machine Check */
|
|
SET_IVOR(2, 0x060) /* Data Storage */
|
|
SET_IVOR(3, 0x080) /* Instruction Storage */
|
|
SET_IVOR(4, 0x0a0) /* External Input */
|
|
SET_IVOR(5, 0x0c0) /* Alignment */
|
|
SET_IVOR(6, 0x0e0) /* Program */
|
|
SET_IVOR(7, 0x100) /* FP Unavailable */
|
|
SET_IVOR(8, 0x120) /* System Call */
|
|
SET_IVOR(9, 0x140) /* Auxiliary Processor Unavailable */
|
|
SET_IVOR(10, 0x160) /* Decrementer */
|
|
SET_IVOR(11, 0x180) /* Fixed Interval Timer */
|
|
SET_IVOR(12, 0x1a0) /* Watchdog Timer */
|
|
SET_IVOR(13, 0x1c0) /* Data TLB Error */
|
|
SET_IVOR(14, 0x1e0) /* Instruction TLB Error */
|
|
SET_IVOR(15, 0x040) /* Debug */
|
|
|
|
sync
|
|
|
|
blr
|
|
|
|
_GLOBAL(setup_altivec_ivors)
|
|
SET_IVOR(32, 0x200) /* AltiVec Unavailable */
|
|
SET_IVOR(33, 0x220) /* AltiVec Assist */
|
|
blr
|
|
|
|
_GLOBAL(setup_perfmon_ivor)
|
|
SET_IVOR(35, 0x260) /* Performance Monitor */
|
|
blr
|
|
|
|
_GLOBAL(setup_doorbell_ivors)
|
|
SET_IVOR(36, 0x280) /* Processor Doorbell */
|
|
SET_IVOR(37, 0x2a0) /* Processor Doorbell Crit */
|
|
blr
|
|
|
|
_GLOBAL(setup_ehv_ivors)
|
|
SET_IVOR(40, 0x300) /* Embedded Hypervisor System Call */
|
|
SET_IVOR(41, 0x320) /* Embedded Hypervisor Privilege */
|
|
SET_IVOR(38, 0x2c0) /* Guest Processor Doorbell */
|
|
SET_IVOR(39, 0x2e0) /* Guest Processor Doorbell Crit/MC */
|
|
blr
|
|
|
|
_GLOBAL(setup_lrat_ivor)
|
|
SET_IVOR(42, 0x340) /* LRAT Error */
|
|
blr
|