170 lines
4.6 KiB
ArmAsm
170 lines
4.6 KiB
ArmAsm
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright SUSE Linux Products GmbH 2009
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*
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* Authors: Alexander Graf <agraf@suse.de>
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*/
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#include <asm/ppc_asm.h>
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#include <asm/kvm_asm.h>
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#include <asm/reg.h>
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#include <asm/mmu.h>
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#include <asm/page.h>
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#include <asm/asm-offsets.h>
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#ifdef CONFIG_PPC_BOOK3S_64
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#include <asm/exception-64s.h>
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#endif
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/*****************************************************************************
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* *
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* Real Mode handlers that need to be in low physical memory *
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* *
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****************************************************************************/
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#if defined(CONFIG_PPC_BOOK3S_64)
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#ifdef PPC64_ELF_ABI_v2
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#define FUNC(name) name
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#else
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#define FUNC(name) GLUE(.,name)
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#endif
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#elif defined(CONFIG_PPC_BOOK3S_32)
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#define FUNC(name) name
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.macro INTERRUPT_TRAMPOLINE intno
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.global kvmppc_trampoline_\intno
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kvmppc_trampoline_\intno:
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mtspr SPRN_SPRG_SCRATCH0, r13 /* Save r13 */
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/*
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* First thing to do is to find out if we're coming
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* from a KVM guest or a Linux process.
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*
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* To distinguish, we check a magic byte in the PACA/current
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*/
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mfspr r13, SPRN_SPRG_THREAD
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lwz r13, THREAD_KVM_SVCPU(r13)
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/* PPC32 can have a NULL pointer - let's check for that */
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mtspr SPRN_SPRG_SCRATCH1, r12 /* Save r12 */
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mfcr r12
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cmpwi r13, 0
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bne 1f
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2: mtcr r12
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mfspr r12, SPRN_SPRG_SCRATCH1
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mfspr r13, SPRN_SPRG_SCRATCH0 /* r13 = original r13 */
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b kvmppc_resume_\intno /* Get back original handler */
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1: tophys(r13, r13)
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stw r12, HSTATE_SCRATCH1(r13)
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mfspr r12, SPRN_SPRG_SCRATCH1
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stw r12, HSTATE_SCRATCH0(r13)
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lbz r12, HSTATE_IN_GUEST(r13)
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cmpwi r12, KVM_GUEST_MODE_NONE
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bne ..kvmppc_handler_hasmagic_\intno
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/* No KVM guest? Then jump back to the Linux handler! */
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lwz r12, HSTATE_SCRATCH1(r13)
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b 2b
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/* Now we know we're handling a KVM guest */
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..kvmppc_handler_hasmagic_\intno:
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/* Should we just skip the faulting instruction? */
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cmpwi r12, KVM_GUEST_MODE_SKIP
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beq kvmppc_handler_skip_ins
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/* Let's store which interrupt we're handling */
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li r12, \intno
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/* Jump into the SLB exit code that goes to the highmem handler */
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b kvmppc_handler_trampoline_exit
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.endm
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSTEM_RESET
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_MACHINE_CHECK
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DATA_STORAGE
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_INST_STORAGE
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_EXTERNAL
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALIGNMENT
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PROGRAM
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_FP_UNAVAIL
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DECREMENTER
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSCALL
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_TRACE
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PERFMON
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALTIVEC
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/*
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* Bring us back to the faulting code, but skip the
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* faulting instruction.
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*
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* This is a generic exit path from the interrupt
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* trampolines above.
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*
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* Input Registers:
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*
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* R12 = free
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* R13 = Shadow VCPU (PACA)
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* HSTATE.SCRATCH0 = guest R12
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* HSTATE.SCRATCH1 = guest CR
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* SPRG_SCRATCH0 = guest R13
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*
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*/
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kvmppc_handler_skip_ins:
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/* Patch the IP to the next instruction */
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mfsrr0 r12
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addi r12, r12, 4
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mtsrr0 r12
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/* Clean up all state */
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lwz r12, HSTATE_SCRATCH1(r13)
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mtcr r12
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PPC_LL r12, HSTATE_SCRATCH0(r13)
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GET_SCRATCH0(r13)
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/* And get back into the code */
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RFI
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#endif
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/*
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* Call kvmppc_handler_trampoline_enter in real mode
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*
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* On entry, r4 contains the guest shadow MSR
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* MSR.EE has to be 0 when calling this function
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*/
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_GLOBAL_TOC(kvmppc_entry_trampoline)
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mfmsr r5
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LOAD_REG_ADDR(r7, kvmppc_handler_trampoline_enter)
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toreal(r7)
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li r6, MSR_IR | MSR_DR
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andc r6, r5, r6 /* Clear DR and IR in MSR value */
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/*
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* Set EE in HOST_MSR so that it's enabled when we get into our
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* C exit handler function.
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*/
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ori r5, r5, MSR_EE
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mtsrr0 r7
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mtsrr1 r6
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RFI
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#include "book3s_segment.S"
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