1136 lines
28 KiB
ArmAsm
1136 lines
28 KiB
ArmAsm
/*
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* Kernel execution entry point code.
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*
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* Copyright (c) 1995-1996 Gary Thomas <gdt@linuxppc.org>
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* Initial PowerPC version.
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* Copyright (c) 1996 Cort Dougan <cort@cs.nmt.edu>
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* Rewritten for PReP
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* Copyright (c) 1996 Paul Mackerras <paulus@cs.anu.edu.au>
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* Low-level exception handers, MMU support, and rewrite.
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* Copyright (c) 1997 Dan Malek <dmalek@jlc.net>
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* PowerPC 8xx modifications.
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* Copyright (c) 1998-1999 TiVo, Inc.
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* PowerPC 403GCX modifications.
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* Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu>
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* PowerPC 403GCX/405GP modifications.
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* Copyright 2000 MontaVista Software Inc.
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* PPC405 modifications
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* PowerPC 403GCX/405GP modifications.
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* Author: MontaVista Software, Inc.
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* frank_rowand@mvista.com or source@mvista.com
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* debbie_chu@mvista.com
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* Copyright 2002-2004 MontaVista Software, Inc.
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* PowerPC 44x support, Matt Porter <mporter@kernel.crashing.org>
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* Copyright 2004 Freescale Semiconductor, Inc
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* PowerPC e500 modifications, Kumar Gala <galak@kernel.crashing.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/threads.h>
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#include <asm/processor.h>
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#include <asm/page.h>
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#include <asm/mmu.h>
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#include <asm/pgtable.h>
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#include <asm/cputable.h>
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#include <asm/thread_info.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/cache.h>
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#include "head_booke.h"
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/* As with the other PowerPC ports, it is expected that when code
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* execution begins here, the following registers contain valid, yet
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* optional, information:
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*
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* r3 - Board info structure pointer (DRAM, frequency, MAC address, etc.)
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* r4 - Starting address of the init RAM disk
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* r5 - Ending address of the init RAM disk
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* r6 - Start of kernel command line string (e.g. "mem=128")
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* r7 - End of kernel command line string
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*
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*/
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.section .text.head, "ax"
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_ENTRY(_stext);
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_ENTRY(_start);
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/*
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* Reserve a word at a fixed location to store the address
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* of abatron_pteptrs
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*/
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nop
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/*
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* Save parameters we are passed
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*/
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mr r31,r3
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mr r30,r4
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mr r29,r5
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mr r28,r6
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mr r27,r7
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li r25,0 /* phys kernel start (low) */
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li r24,0 /* CPU number */
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li r23,0 /* phys kernel start (high) */
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/* We try to not make any assumptions about how the boot loader
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* setup or used the TLBs. We invalidate all mappings from the
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* boot loader and load a single entry in TLB1[0] to map the
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* first 64M of kernel memory. Any boot info passed from the
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* bootloader needs to live in this first 64M.
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*
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* Requirement on bootloader:
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* - The page we're executing in needs to reside in TLB1 and
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* have IPROT=1. If not an invalidate broadcast could
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* evict the entry we're currently executing in.
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*
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* r3 = Index of TLB1 were executing in
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* r4 = Current MSR[IS]
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* r5 = Index of TLB1 temp mapping
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*
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* Later in mapin_ram we will correctly map lowmem, and resize TLB1[0]
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* if needed
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*/
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_ENTRY(__early_start)
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/* 1. Find the index of the entry we're executing in */
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bl invstr /* Find our address */
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invstr: mflr r6 /* Make it accessible */
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mfmsr r7
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rlwinm r4,r7,27,31,31 /* extract MSR[IS] */
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mfspr r7, SPRN_PID0
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slwi r7,r7,16
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or r7,r7,r4
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mtspr SPRN_MAS6,r7
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tlbsx 0,r6 /* search MSR[IS], SPID=PID0 */
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#ifndef CONFIG_E200
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mfspr r7,SPRN_MAS1
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andis. r7,r7,MAS1_VALID@h
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bne match_TLB
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mfspr r7,SPRN_PID1
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slwi r7,r7,16
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or r7,r7,r4
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mtspr SPRN_MAS6,r7
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tlbsx 0,r6 /* search MSR[IS], SPID=PID1 */
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mfspr r7,SPRN_MAS1
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andis. r7,r7,MAS1_VALID@h
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bne match_TLB
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mfspr r7, SPRN_PID2
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slwi r7,r7,16
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or r7,r7,r4
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mtspr SPRN_MAS6,r7
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tlbsx 0,r6 /* Fall through, we had to match */
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#endif
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match_TLB:
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mfspr r7,SPRN_MAS0
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rlwinm r3,r7,16,20,31 /* Extract MAS0(Entry) */
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mfspr r7,SPRN_MAS1 /* Insure IPROT set */
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oris r7,r7,MAS1_IPROT@h
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mtspr SPRN_MAS1,r7
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tlbwe
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/* 2. Invalidate all entries except the entry we're executing in */
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mfspr r9,SPRN_TLB1CFG
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andi. r9,r9,0xfff
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li r6,0 /* Set Entry counter to 0 */
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1: lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
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rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */
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mtspr SPRN_MAS0,r7
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tlbre
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mfspr r7,SPRN_MAS1
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rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */
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cmpw r3,r6
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beq skpinv /* Dont update the current execution TLB */
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mtspr SPRN_MAS1,r7
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tlbwe
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isync
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skpinv: addi r6,r6,1 /* Increment */
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cmpw r6,r9 /* Are we done? */
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bne 1b /* If not, repeat */
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/* Invalidate TLB0 */
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li r6,0x04
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tlbivax 0,r6
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TLBSYNC
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/* Invalidate TLB1 */
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li r6,0x0c
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tlbivax 0,r6
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TLBSYNC
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/* 3. Setup a temp mapping and jump to it */
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andi. r5, r3, 0x1 /* Find an entry not used and is non-zero */
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addi r5, r5, 0x1
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lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
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rlwimi r7,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */
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mtspr SPRN_MAS0,r7
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tlbre
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/* grab and fixup the RPN */
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mfspr r6,SPRN_MAS1 /* extract MAS1[SIZE] */
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rlwinm r6,r6,25,27,30
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li r8,-1
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addi r6,r6,10
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slw r6,r8,r6 /* convert to mask */
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bl 1f /* Find our address */
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1: mflr r7
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mfspr r8,SPRN_MAS3
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#ifdef CONFIG_PHYS_64BIT
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mfspr r23,SPRN_MAS7
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#endif
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and r8,r6,r8
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subfic r9,r6,-4096
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and r9,r9,r7
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or r25,r8,r9
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ori r8,r25,(MAS3_SX|MAS3_SW|MAS3_SR)
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/* Just modify the entry ID and EPN for the temp mapping */
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lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
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rlwimi r7,r5,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r5) */
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mtspr SPRN_MAS0,r7
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xori r6,r4,1 /* Setup TMP mapping in the other Address space */
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slwi r6,r6,12
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oris r6,r6,(MAS1_VALID|MAS1_IPROT)@h
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ori r6,r6,(MAS1_TSIZE(BOOKE_PAGESZ_4K))@l
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mtspr SPRN_MAS1,r6
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mfspr r6,SPRN_MAS2
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li r7,0 /* temp EPN = 0 */
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rlwimi r7,r6,0,20,31
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mtspr SPRN_MAS2,r7
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mtspr SPRN_MAS3,r8
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tlbwe
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xori r6,r4,1
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slwi r6,r6,5 /* setup new context with other address space */
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bl 1f /* Find our address */
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1: mflr r9
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rlwimi r7,r9,0,20,31
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addi r7,r7,24
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mtspr SPRN_SRR0,r7
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mtspr SPRN_SRR1,r6
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rfi
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/* 4. Clear out PIDs & Search info */
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li r6,0
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mtspr SPRN_PID0,r6
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#ifndef CONFIG_E200
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mtspr SPRN_PID1,r6
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mtspr SPRN_PID2,r6
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#endif
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mtspr SPRN_MAS6,r6
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/* 5. Invalidate mapping we started in */
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lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
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rlwimi r7,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */
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mtspr SPRN_MAS0,r7
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tlbre
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mfspr r6,SPRN_MAS1
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rlwinm r6,r6,0,2,0 /* clear IPROT */
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mtspr SPRN_MAS1,r6
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tlbwe
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/* Invalidate TLB1 */
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li r9,0x0c
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tlbivax 0,r9
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TLBSYNC
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/* The mapping only needs to be cache-coherent on SMP */
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#ifdef CONFIG_SMP
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#define M_IF_SMP MAS2_M
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#else
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#define M_IF_SMP 0
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#endif
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/* 6. Setup KERNELBASE mapping in TLB1[0] */
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lis r6,0x1000 /* Set MAS0(TLBSEL) = TLB1(1), ESEL = 0 */
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mtspr SPRN_MAS0,r6
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lis r6,(MAS1_VALID|MAS1_IPROT)@h
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ori r6,r6,(MAS1_TSIZE(BOOKE_PAGESZ_64M))@l
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mtspr SPRN_MAS1,r6
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lis r6,MAS2_VAL(PAGE_OFFSET, BOOKE_PAGESZ_64M, M_IF_SMP)@h
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ori r6,r6,MAS2_VAL(PAGE_OFFSET, BOOKE_PAGESZ_64M, M_IF_SMP)@l
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mtspr SPRN_MAS2,r6
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mtspr SPRN_MAS3,r8
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tlbwe
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/* 7. Jump to KERNELBASE mapping */
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lis r6,(KERNELBASE & ~0xfff)@h
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ori r6,r6,(KERNELBASE & ~0xfff)@l
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lis r7,MSR_KERNEL@h
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ori r7,r7,MSR_KERNEL@l
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bl 1f /* Find our address */
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1: mflr r9
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rlwimi r6,r9,0,20,31
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addi r6,r6,(2f - 1b)
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mtspr SPRN_SRR0,r6
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mtspr SPRN_SRR1,r7
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rfi /* start execution out of TLB1[0] entry */
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/* 8. Clear out the temp mapping */
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2: lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
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rlwimi r7,r5,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r5) */
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mtspr SPRN_MAS0,r7
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tlbre
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mfspr r8,SPRN_MAS1
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rlwinm r8,r8,0,2,0 /* clear IPROT */
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mtspr SPRN_MAS1,r8
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tlbwe
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/* Invalidate TLB1 */
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li r9,0x0c
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tlbivax 0,r9
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TLBSYNC
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/* Establish the interrupt vector offsets */
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SET_IVOR(0, CriticalInput);
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SET_IVOR(1, MachineCheck);
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SET_IVOR(2, DataStorage);
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SET_IVOR(3, InstructionStorage);
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SET_IVOR(4, ExternalInput);
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SET_IVOR(5, Alignment);
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SET_IVOR(6, Program);
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SET_IVOR(7, FloatingPointUnavailable);
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SET_IVOR(8, SystemCall);
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SET_IVOR(9, AuxillaryProcessorUnavailable);
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SET_IVOR(10, Decrementer);
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SET_IVOR(11, FixedIntervalTimer);
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SET_IVOR(12, WatchdogTimer);
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SET_IVOR(13, DataTLBError);
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SET_IVOR(14, InstructionTLBError);
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SET_IVOR(15, DebugDebug);
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#if defined(CONFIG_E500) && !defined(CONFIG_PPC_E500MC)
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SET_IVOR(15, DebugCrit);
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#endif
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SET_IVOR(32, SPEUnavailable);
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SET_IVOR(33, SPEFloatingPointData);
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SET_IVOR(34, SPEFloatingPointRound);
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#ifndef CONFIG_E200
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SET_IVOR(35, PerformanceMonitor);
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#endif
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#ifdef CONFIG_PPC_E500MC
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SET_IVOR(36, Doorbell);
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#endif
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/* Establish the interrupt vector base */
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lis r4,interrupt_base@h /* IVPR only uses the high 16-bits */
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mtspr SPRN_IVPR,r4
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/* Setup the defaults for TLB entries */
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li r2,(MAS4_TSIZED(BOOKE_PAGESZ_4K))@l
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#ifdef CONFIG_E200
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oris r2,r2,MAS4_TLBSELD(1)@h
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#endif
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mtspr SPRN_MAS4, r2
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#if 0
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/* Enable DOZE */
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mfspr r2,SPRN_HID0
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oris r2,r2,HID0_DOZE@h
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mtspr SPRN_HID0, r2
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#endif
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#ifdef CONFIG_E200
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/* enable dedicated debug exception handling resources (Debug APU) */
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mfspr r2,SPRN_HID0
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ori r2,r2,HID0_DAPUEN@l
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mtspr SPRN_HID0,r2
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#endif
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#if !defined(CONFIG_BDI_SWITCH)
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/*
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* The Abatron BDI JTAG debugger does not tolerate others
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* mucking with the debug registers.
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*/
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lis r2,DBCR0_IDM@h
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mtspr SPRN_DBCR0,r2
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isync
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/* clear any residual debug events */
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li r2,-1
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mtspr SPRN_DBSR,r2
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#endif
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#ifdef CONFIG_SMP
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/* Check to see if we're the second processor, and jump
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* to the secondary_start code if so
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*/
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mfspr r24,SPRN_PIR
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cmpwi r24,0
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bne __secondary_start
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#endif
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/*
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* This is where the main kernel code starts.
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*/
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/* ptr to current */
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lis r2,init_task@h
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ori r2,r2,init_task@l
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/* ptr to current thread */
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addi r4,r2,THREAD /* init task's THREAD */
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mtspr SPRN_SPRG3,r4
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/* stack */
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lis r1,init_thread_union@h
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ori r1,r1,init_thread_union@l
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li r0,0
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stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1)
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bl early_init
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#ifdef CONFIG_RELOCATABLE
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lis r3,kernstart_addr@ha
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la r3,kernstart_addr@l(r3)
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#ifdef CONFIG_PHYS_64BIT
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stw r23,0(r3)
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stw r25,4(r3)
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#else
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stw r25,0(r3)
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#endif
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#endif
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mfspr r3,SPRN_TLB1CFG
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andi. r3,r3,0xfff
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lis r4,num_tlbcam_entries@ha
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stw r3,num_tlbcam_entries@l(r4)
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/*
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* Decide what sort of machine this is and initialize the MMU.
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*/
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mr r3,r31
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mr r4,r30
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mr r5,r29
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mr r6,r28
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mr r7,r27
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bl machine_init
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bl MMU_init
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/* Setup PTE pointers for the Abatron bdiGDB */
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lis r6, swapper_pg_dir@h
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ori r6, r6, swapper_pg_dir@l
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lis r5, abatron_pteptrs@h
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ori r5, r5, abatron_pteptrs@l
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lis r4, KERNELBASE@h
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ori r4, r4, KERNELBASE@l
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stw r5, 0(r4) /* Save abatron_pteptrs at a fixed location */
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stw r6, 0(r5)
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/* Let's move on */
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lis r4,start_kernel@h
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ori r4,r4,start_kernel@l
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lis r3,MSR_KERNEL@h
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ori r3,r3,MSR_KERNEL@l
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mtspr SPRN_SRR0,r4
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mtspr SPRN_SRR1,r3
|
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rfi /* change context and jump to start_kernel */
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|
|
/* Macros to hide the PTE size differences
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|
*
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* FIND_PTE -- walks the page tables given EA & pgdir pointer
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* r10 -- EA of fault
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* r11 -- PGDIR pointer
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* r12 -- free
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* label 2: is the bailout case
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*
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* if we find the pte (fall through):
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* r11 is low pte word
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* r12 is pointer to the pte
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*/
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#ifdef CONFIG_PTE_64BIT
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#define FIND_PTE \
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rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \
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lwzx r11, r12, r11; /* Get pgd/pmd entry */ \
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rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \
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beq 2f; /* Bail if no table */ \
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rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \
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lwz r11, 4(r12); /* Get pte entry */
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#else
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#define FIND_PTE \
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rlwimi r11, r10, 12, 20, 29; /* Create L1 (pgdir/pmd) address */ \
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lwz r11, 0(r11); /* Get L1 entry */ \
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rlwinm. r12, r11, 0, 0, 19; /* Extract L2 (pte) base address */ \
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beq 2f; /* Bail if no table */ \
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rlwimi r12, r10, 22, 20, 29; /* Compute PTE address */ \
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lwz r11, 0(r12); /* Get Linux PTE */
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#endif
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|
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/*
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* Interrupt vector entry code
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|
*
|
|
* The Book E MMUs are always on so we don't need to handle
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|
* interrupts in real mode as with previous PPC processors. In
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|
* this case we handle interrupts in the kernel virtual address
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|
* space.
|
|
*
|
|
* Interrupt vectors are dynamically placed relative to the
|
|
* interrupt prefix as determined by the address of interrupt_base.
|
|
* The interrupt vectors offsets are programmed using the labels
|
|
* for each interrupt vector entry.
|
|
*
|
|
* Interrupt vectors must be aligned on a 16 byte boundary.
|
|
* We align on a 32 byte cache line boundary for good measure.
|
|
*/
|
|
|
|
interrupt_base:
|
|
/* Critical Input Interrupt */
|
|
CRITICAL_EXCEPTION(0x0100, CriticalInput, unknown_exception)
|
|
|
|
/* Machine Check Interrupt */
|
|
#ifdef CONFIG_E200
|
|
/* no RFMCI, MCSRRs on E200 */
|
|
CRITICAL_EXCEPTION(0x0200, MachineCheck, machine_check_exception)
|
|
#else
|
|
MCHECK_EXCEPTION(0x0200, MachineCheck, machine_check_exception)
|
|
#endif
|
|
|
|
/* Data Storage Interrupt */
|
|
START_EXCEPTION(DataStorage)
|
|
NORMAL_EXCEPTION_PROLOG
|
|
mfspr r5,SPRN_ESR /* Grab the ESR, save it, pass arg3 */
|
|
stw r5,_ESR(r11)
|
|
mfspr r4,SPRN_DEAR /* Grab the DEAR, save it, pass arg2 */
|
|
andis. r10,r5,(ESR_ILK|ESR_DLK)@h
|
|
bne 1f
|
|
EXC_XFER_EE_LITE(0x0300, handle_page_fault)
|
|
1:
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
EXC_XFER_EE_LITE(0x0300, CacheLockingException)
|
|
|
|
/* Instruction Storage Interrupt */
|
|
INSTRUCTION_STORAGE_EXCEPTION
|
|
|
|
/* External Input Interrupt */
|
|
EXCEPTION(0x0500, ExternalInput, do_IRQ, EXC_XFER_LITE)
|
|
|
|
/* Alignment Interrupt */
|
|
ALIGNMENT_EXCEPTION
|
|
|
|
/* Program Interrupt */
|
|
PROGRAM_EXCEPTION
|
|
|
|
/* Floating Point Unavailable Interrupt */
|
|
#ifdef CONFIG_PPC_FPU
|
|
FP_UNAVAILABLE_EXCEPTION
|
|
#else
|
|
#ifdef CONFIG_E200
|
|
/* E200 treats 'normal' floating point instructions as FP Unavail exception */
|
|
EXCEPTION(0x0800, FloatingPointUnavailable, program_check_exception, EXC_XFER_EE)
|
|
#else
|
|
EXCEPTION(0x0800, FloatingPointUnavailable, unknown_exception, EXC_XFER_EE)
|
|
#endif
|
|
#endif
|
|
|
|
/* System Call Interrupt */
|
|
START_EXCEPTION(SystemCall)
|
|
NORMAL_EXCEPTION_PROLOG
|
|
EXC_XFER_EE_LITE(0x0c00, DoSyscall)
|
|
|
|
/* Auxillary Processor Unavailable Interrupt */
|
|
EXCEPTION(0x2900, AuxillaryProcessorUnavailable, unknown_exception, EXC_XFER_EE)
|
|
|
|
/* Decrementer Interrupt */
|
|
DECREMENTER_EXCEPTION
|
|
|
|
/* Fixed Internal Timer Interrupt */
|
|
/* TODO: Add FIT support */
|
|
EXCEPTION(0x3100, FixedIntervalTimer, unknown_exception, EXC_XFER_EE)
|
|
|
|
/* Watchdog Timer Interrupt */
|
|
#ifdef CONFIG_BOOKE_WDT
|
|
CRITICAL_EXCEPTION(0x3200, WatchdogTimer, WatchdogException)
|
|
#else
|
|
CRITICAL_EXCEPTION(0x3200, WatchdogTimer, unknown_exception)
|
|
#endif
|
|
|
|
/* Data TLB Error Interrupt */
|
|
START_EXCEPTION(DataTLBError)
|
|
mtspr SPRN_SPRG0, r10 /* Save some working registers */
|
|
mtspr SPRN_SPRG1, r11
|
|
mtspr SPRN_SPRG4W, r12
|
|
mtspr SPRN_SPRG5W, r13
|
|
mfcr r11
|
|
mtspr SPRN_SPRG7W, r11
|
|
mfspr r10, SPRN_DEAR /* Get faulting address */
|
|
|
|
/* If we are faulting a kernel address, we have to use the
|
|
* kernel page tables.
|
|
*/
|
|
lis r11, PAGE_OFFSET@h
|
|
cmplw 5, r10, r11
|
|
blt 5, 3f
|
|
lis r11, swapper_pg_dir@h
|
|
ori r11, r11, swapper_pg_dir@l
|
|
|
|
mfspr r12,SPRN_MAS1 /* Set TID to 0 */
|
|
rlwinm r12,r12,0,16,1
|
|
mtspr SPRN_MAS1,r12
|
|
|
|
b 4f
|
|
|
|
/* Get the PGD for the current thread */
|
|
3:
|
|
mfspr r11,SPRN_SPRG3
|
|
lwz r11,PGDIR(r11)
|
|
|
|
4:
|
|
/* Mask of required permission bits. Note that while we
|
|
* do copy ESR:ST to _PAGE_RW position as trying to write
|
|
* to an RO page is pretty common, we don't do it with
|
|
* _PAGE_DIRTY. We could do it, but it's a fairly rare
|
|
* event so I'd rather take the overhead when it happens
|
|
* rather than adding an instruction here. We should measure
|
|
* whether the whole thing is worth it in the first place
|
|
* as we could avoid loading SPRN_ESR completely in the first
|
|
* place...
|
|
*
|
|
* TODO: Is it worth doing that mfspr & rlwimi in the first
|
|
* place or can we save a couple of instructions here ?
|
|
*/
|
|
mfspr r12,SPRN_ESR
|
|
li r13,_PAGE_PRESENT|_PAGE_ACCESSED
|
|
rlwimi r13,r12,11,29,29
|
|
|
|
FIND_PTE
|
|
andc. r13,r13,r11 /* Check permission */
|
|
|
|
#ifdef CONFIG_PTE_64BIT
|
|
#ifdef CONFIG_SMP
|
|
subf r10,r11,r12 /* create false data dep */
|
|
lwzx r13,r11,r10 /* Get upper pte bits */
|
|
#else
|
|
lwz r13,0(r12) /* Get upper pte bits */
|
|
#endif
|
|
#endif
|
|
|
|
bne 2f /* Bail if permission/valid mismach */
|
|
|
|
/* Jump to common tlb load */
|
|
b finish_tlb_load
|
|
2:
|
|
/* The bailout. Restore registers to pre-exception conditions
|
|
* and call the heavyweights to help us out.
|
|
*/
|
|
mfspr r11, SPRN_SPRG7R
|
|
mtcr r11
|
|
mfspr r13, SPRN_SPRG5R
|
|
mfspr r12, SPRN_SPRG4R
|
|
mfspr r11, SPRN_SPRG1
|
|
mfspr r10, SPRN_SPRG0
|
|
b DataStorage
|
|
|
|
/* Instruction TLB Error Interrupt */
|
|
/*
|
|
* Nearly the same as above, except we get our
|
|
* information from different registers and bailout
|
|
* to a different point.
|
|
*/
|
|
START_EXCEPTION(InstructionTLBError)
|
|
mtspr SPRN_SPRG0, r10 /* Save some working registers */
|
|
mtspr SPRN_SPRG1, r11
|
|
mtspr SPRN_SPRG4W, r12
|
|
mtspr SPRN_SPRG5W, r13
|
|
mfcr r11
|
|
mtspr SPRN_SPRG7W, r11
|
|
mfspr r10, SPRN_SRR0 /* Get faulting address */
|
|
|
|
/* If we are faulting a kernel address, we have to use the
|
|
* kernel page tables.
|
|
*/
|
|
lis r11, PAGE_OFFSET@h
|
|
cmplw 5, r10, r11
|
|
blt 5, 3f
|
|
lis r11, swapper_pg_dir@h
|
|
ori r11, r11, swapper_pg_dir@l
|
|
|
|
mfspr r12,SPRN_MAS1 /* Set TID to 0 */
|
|
rlwinm r12,r12,0,16,1
|
|
mtspr SPRN_MAS1,r12
|
|
|
|
b 4f
|
|
|
|
/* Get the PGD for the current thread */
|
|
3:
|
|
mfspr r11,SPRN_SPRG3
|
|
lwz r11,PGDIR(r11)
|
|
|
|
4:
|
|
/* Make up the required permissions */
|
|
li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_HWEXEC
|
|
|
|
FIND_PTE
|
|
andc. r13,r13,r11 /* Check permission */
|
|
|
|
#ifdef CONFIG_PTE_64BIT
|
|
#ifdef CONFIG_SMP
|
|
subf r10,r11,r12 /* create false data dep */
|
|
lwzx r13,r11,r10 /* Get upper pte bits */
|
|
#else
|
|
lwz r13,0(r12) /* Get upper pte bits */
|
|
#endif
|
|
#endif
|
|
|
|
bne 2f /* Bail if permission mismach */
|
|
|
|
/* Jump to common TLB load point */
|
|
b finish_tlb_load
|
|
|
|
2:
|
|
/* The bailout. Restore registers to pre-exception conditions
|
|
* and call the heavyweights to help us out.
|
|
*/
|
|
mfspr r11, SPRN_SPRG7R
|
|
mtcr r11
|
|
mfspr r13, SPRN_SPRG5R
|
|
mfspr r12, SPRN_SPRG4R
|
|
mfspr r11, SPRN_SPRG1
|
|
mfspr r10, SPRN_SPRG0
|
|
b InstructionStorage
|
|
|
|
#ifdef CONFIG_SPE
|
|
/* SPE Unavailable */
|
|
START_EXCEPTION(SPEUnavailable)
|
|
NORMAL_EXCEPTION_PROLOG
|
|
bne load_up_spe
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
EXC_XFER_EE_LITE(0x2010, KernelSPE)
|
|
#else
|
|
EXCEPTION(0x2020, SPEUnavailable, unknown_exception, EXC_XFER_EE)
|
|
#endif /* CONFIG_SPE */
|
|
|
|
/* SPE Floating Point Data */
|
|
#ifdef CONFIG_SPE
|
|
EXCEPTION(0x2030, SPEFloatingPointData, SPEFloatingPointException, EXC_XFER_EE);
|
|
|
|
/* SPE Floating Point Round */
|
|
EXCEPTION(0x2050, SPEFloatingPointRound, SPEFloatingPointRoundException, EXC_XFER_EE)
|
|
#else
|
|
EXCEPTION(0x2040, SPEFloatingPointData, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x2050, SPEFloatingPointRound, unknown_exception, EXC_XFER_EE)
|
|
#endif /* CONFIG_SPE */
|
|
|
|
/* Performance Monitor */
|
|
EXCEPTION(0x2060, PerformanceMonitor, performance_monitor_exception, EXC_XFER_STD)
|
|
|
|
#ifdef CONFIG_PPC_E500MC
|
|
EXCEPTION(0x2070, Doorbell, unknown_exception, EXC_XFER_EE)
|
|
#endif
|
|
|
|
/* Debug Interrupt */
|
|
DEBUG_DEBUG_EXCEPTION
|
|
#if defined(CONFIG_E500) && !defined(CONFIG_PPC_E500MC)
|
|
DEBUG_CRIT_EXCEPTION
|
|
#endif
|
|
|
|
/*
|
|
* Local functions
|
|
*/
|
|
|
|
/*
|
|
* Both the instruction and data TLB miss get to this
|
|
* point to load the TLB.
|
|
* r10 - available to use
|
|
* r11 - TLB (info from Linux PTE)
|
|
* r12 - available to use
|
|
* r13 - upper bits of PTE (if PTE_64BIT) or available to use
|
|
* CR5 - results of addr >= PAGE_OFFSET
|
|
* MAS0, MAS1 - loaded with proper value when we get here
|
|
* MAS2, MAS3 - will need additional info from Linux PTE
|
|
* Upon exit, we reload everything and RFI.
|
|
*/
|
|
finish_tlb_load:
|
|
/*
|
|
* We set execute, because we don't have the granularity to
|
|
* properly set this at the page level (Linux problem).
|
|
* Many of these bits are software only. Bits we don't set
|
|
* here we (properly should) assume have the appropriate value.
|
|
*/
|
|
|
|
mfspr r12, SPRN_MAS2
|
|
#ifdef CONFIG_PTE_64BIT
|
|
rlwimi r12, r11, 26, 24, 31 /* extract ...WIMGE from pte */
|
|
#else
|
|
rlwimi r12, r11, 26, 27, 31 /* extract WIMGE from pte */
|
|
#endif
|
|
#ifdef CONFIG_SMP
|
|
ori r12, r12, MAS2_M
|
|
#endif
|
|
mtspr SPRN_MAS2, r12
|
|
|
|
li r10, (_PAGE_HWEXEC | _PAGE_PRESENT)
|
|
rlwimi r10, r11, 31, 29, 29 /* extract _PAGE_DIRTY into SW */
|
|
and r12, r11, r10
|
|
andi. r10, r11, _PAGE_USER /* Test for _PAGE_USER */
|
|
slwi r10, r12, 1
|
|
or r10, r10, r12
|
|
iseleq r12, r12, r10
|
|
|
|
#ifdef CONFIG_PTE_64BIT
|
|
rlwimi r12, r13, 24, 0, 7 /* grab RPN[32:39] */
|
|
rlwimi r12, r11, 24, 8, 19 /* grab RPN[40:51] */
|
|
mtspr SPRN_MAS3, r12
|
|
BEGIN_MMU_FTR_SECTION
|
|
srwi r10, r13, 8 /* grab RPN[8:31] */
|
|
mtspr SPRN_MAS7, r10
|
|
END_MMU_FTR_SECTION_IFSET(MMU_FTR_BIG_PHYS)
|
|
#else
|
|
rlwimi r11, r12, 0, 20, 31 /* Extract RPN from PTE and merge with perms */
|
|
mtspr SPRN_MAS3, r11
|
|
#endif
|
|
#ifdef CONFIG_E200
|
|
/* Round robin TLB1 entries assignment */
|
|
mfspr r12, SPRN_MAS0
|
|
|
|
/* Extract TLB1CFG(NENTRY) */
|
|
mfspr r11, SPRN_TLB1CFG
|
|
andi. r11, r11, 0xfff
|
|
|
|
/* Extract MAS0(NV) */
|
|
andi. r13, r12, 0xfff
|
|
addi r13, r13, 1
|
|
cmpw 0, r13, r11
|
|
addi r12, r12, 1
|
|
|
|
/* check if we need to wrap */
|
|
blt 7f
|
|
|
|
/* wrap back to first free tlbcam entry */
|
|
lis r13, tlbcam_index@ha
|
|
lwz r13, tlbcam_index@l(r13)
|
|
rlwimi r12, r13, 0, 20, 31
|
|
7:
|
|
mtspr SPRN_MAS0,r12
|
|
#endif /* CONFIG_E200 */
|
|
|
|
tlbwe
|
|
|
|
/* Done...restore registers and get out of here. */
|
|
mfspr r11, SPRN_SPRG7R
|
|
mtcr r11
|
|
mfspr r13, SPRN_SPRG5R
|
|
mfspr r12, SPRN_SPRG4R
|
|
mfspr r11, SPRN_SPRG1
|
|
mfspr r10, SPRN_SPRG0
|
|
rfi /* Force context change */
|
|
|
|
#ifdef CONFIG_SPE
|
|
/* Note that the SPE support is closely modeled after the AltiVec
|
|
* support. Changes to one are likely to be applicable to the
|
|
* other! */
|
|
load_up_spe:
|
|
/*
|
|
* Disable SPE for the task which had SPE previously,
|
|
* and save its SPE registers in its thread_struct.
|
|
* Enables SPE for use in the kernel on return.
|
|
* On SMP we know the SPE units are free, since we give it up every
|
|
* switch. -- Kumar
|
|
*/
|
|
mfmsr r5
|
|
oris r5,r5,MSR_SPE@h
|
|
mtmsr r5 /* enable use of SPE now */
|
|
isync
|
|
/*
|
|
* For SMP, we don't do lazy SPE switching because it just gets too
|
|
* horrendously complex, especially when a task switches from one CPU
|
|
* to another. Instead we call giveup_spe in switch_to.
|
|
*/
|
|
#ifndef CONFIG_SMP
|
|
lis r3,last_task_used_spe@ha
|
|
lwz r4,last_task_used_spe@l(r3)
|
|
cmpi 0,r4,0
|
|
beq 1f
|
|
addi r4,r4,THREAD /* want THREAD of last_task_used_spe */
|
|
SAVE_32EVRS(0,r10,r4)
|
|
evxor evr10, evr10, evr10 /* clear out evr10 */
|
|
evmwumiaa evr10, evr10, evr10 /* evr10 <- ACC = 0 * 0 + ACC */
|
|
li r5,THREAD_ACC
|
|
evstddx evr10, r4, r5 /* save off accumulator */
|
|
lwz r5,PT_REGS(r4)
|
|
lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5)
|
|
lis r10,MSR_SPE@h
|
|
andc r4,r4,r10 /* disable SPE for previous task */
|
|
stw r4,_MSR-STACK_FRAME_OVERHEAD(r5)
|
|
1:
|
|
#endif /* !CONFIG_SMP */
|
|
/* enable use of SPE after return */
|
|
oris r9,r9,MSR_SPE@h
|
|
mfspr r5,SPRN_SPRG3 /* current task's THREAD (phys) */
|
|
li r4,1
|
|
li r10,THREAD_ACC
|
|
stw r4,THREAD_USED_SPE(r5)
|
|
evlddx evr4,r10,r5
|
|
evmra evr4,evr4
|
|
REST_32EVRS(0,r10,r5)
|
|
#ifndef CONFIG_SMP
|
|
subi r4,r5,THREAD
|
|
stw r4,last_task_used_spe@l(r3)
|
|
#endif /* !CONFIG_SMP */
|
|
/* restore registers and return */
|
|
2: REST_4GPRS(3, r11)
|
|
lwz r10,_CCR(r11)
|
|
REST_GPR(1, r11)
|
|
mtcr r10
|
|
lwz r10,_LINK(r11)
|
|
mtlr r10
|
|
REST_GPR(10, r11)
|
|
mtspr SPRN_SRR1,r9
|
|
mtspr SPRN_SRR0,r12
|
|
REST_GPR(9, r11)
|
|
REST_GPR(12, r11)
|
|
lwz r11,GPR11(r11)
|
|
rfi
|
|
|
|
/*
|
|
* SPE unavailable trap from kernel - print a message, but let
|
|
* the task use SPE in the kernel until it returns to user mode.
|
|
*/
|
|
KernelSPE:
|
|
lwz r3,_MSR(r1)
|
|
oris r3,r3,MSR_SPE@h
|
|
stw r3,_MSR(r1) /* enable use of SPE after return */
|
|
lis r3,87f@h
|
|
ori r3,r3,87f@l
|
|
mr r4,r2 /* current */
|
|
lwz r5,_NIP(r1)
|
|
bl printk
|
|
b ret_from_except
|
|
87: .string "SPE used in kernel (task=%p, pc=%x) \n"
|
|
.align 4,0
|
|
|
|
#endif /* CONFIG_SPE */
|
|
|
|
/*
|
|
* Global functions
|
|
*/
|
|
|
|
/*
|
|
* extern void loadcam_entry(unsigned int index)
|
|
*
|
|
* Load TLBCAM[index] entry in to the L2 CAM MMU
|
|
*/
|
|
_GLOBAL(loadcam_entry)
|
|
lis r4,TLBCAM@ha
|
|
addi r4,r4,TLBCAM@l
|
|
mulli r5,r3,20
|
|
add r3,r5,r4
|
|
lwz r4,0(r3)
|
|
mtspr SPRN_MAS0,r4
|
|
lwz r4,4(r3)
|
|
mtspr SPRN_MAS1,r4
|
|
lwz r4,8(r3)
|
|
mtspr SPRN_MAS2,r4
|
|
lwz r4,12(r3)
|
|
mtspr SPRN_MAS3,r4
|
|
tlbwe
|
|
isync
|
|
blr
|
|
|
|
/*
|
|
* extern void giveup_altivec(struct task_struct *prev)
|
|
*
|
|
* The e500 core does not have an AltiVec unit.
|
|
*/
|
|
_GLOBAL(giveup_altivec)
|
|
blr
|
|
|
|
#ifdef CONFIG_SPE
|
|
/*
|
|
* extern void giveup_spe(struct task_struct *prev)
|
|
*
|
|
*/
|
|
_GLOBAL(giveup_spe)
|
|
mfmsr r5
|
|
oris r5,r5,MSR_SPE@h
|
|
mtmsr r5 /* enable use of SPE now */
|
|
isync
|
|
cmpi 0,r3,0
|
|
beqlr- /* if no previous owner, done */
|
|
addi r3,r3,THREAD /* want THREAD of task */
|
|
lwz r5,PT_REGS(r3)
|
|
cmpi 0,r5,0
|
|
SAVE_32EVRS(0, r4, r3)
|
|
evxor evr6, evr6, evr6 /* clear out evr6 */
|
|
evmwumiaa evr6, evr6, evr6 /* evr6 <- ACC = 0 * 0 + ACC */
|
|
li r4,THREAD_ACC
|
|
evstddx evr6, r4, r3 /* save off accumulator */
|
|
mfspr r6,SPRN_SPEFSCR
|
|
stw r6,THREAD_SPEFSCR(r3) /* save spefscr register value */
|
|
beq 1f
|
|
lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5)
|
|
lis r3,MSR_SPE@h
|
|
andc r4,r4,r3 /* disable SPE for previous task */
|
|
stw r4,_MSR-STACK_FRAME_OVERHEAD(r5)
|
|
1:
|
|
#ifndef CONFIG_SMP
|
|
li r5,0
|
|
lis r4,last_task_used_spe@ha
|
|
stw r5,last_task_used_spe@l(r4)
|
|
#endif /* !CONFIG_SMP */
|
|
blr
|
|
#endif /* CONFIG_SPE */
|
|
|
|
/*
|
|
* extern void giveup_fpu(struct task_struct *prev)
|
|
*
|
|
* Not all FSL Book-E cores have an FPU
|
|
*/
|
|
#ifndef CONFIG_PPC_FPU
|
|
_GLOBAL(giveup_fpu)
|
|
blr
|
|
#endif
|
|
|
|
/*
|
|
* extern void abort(void)
|
|
*
|
|
* At present, this routine just applies a system reset.
|
|
*/
|
|
_GLOBAL(abort)
|
|
li r13,0
|
|
mtspr SPRN_DBCR0,r13 /* disable all debug events */
|
|
isync
|
|
mfmsr r13
|
|
ori r13,r13,MSR_DE@l /* Enable Debug Events */
|
|
mtmsr r13
|
|
isync
|
|
mfspr r13,SPRN_DBCR0
|
|
lis r13,(DBCR0_IDM|DBCR0_RST_CHIP)@h
|
|
mtspr SPRN_DBCR0,r13
|
|
isync
|
|
|
|
_GLOBAL(set_context)
|
|
|
|
#ifdef CONFIG_BDI_SWITCH
|
|
/* Context switch the PTE pointer for the Abatron BDI2000.
|
|
* The PGDIR is the second parameter.
|
|
*/
|
|
lis r5, abatron_pteptrs@h
|
|
ori r5, r5, abatron_pteptrs@l
|
|
stw r4, 0x4(r5)
|
|
#endif
|
|
mtspr SPRN_PID,r3
|
|
isync /* Force context change */
|
|
blr
|
|
|
|
_GLOBAL(flush_dcache_L1)
|
|
mfspr r3,SPRN_L1CFG0
|
|
|
|
rlwinm r5,r3,9,3 /* Extract cache block size */
|
|
twlgti r5,1 /* Only 32 and 64 byte cache blocks
|
|
* are currently defined.
|
|
*/
|
|
li r4,32
|
|
subfic r6,r5,2 /* r6 = log2(1KiB / cache block size) -
|
|
* log2(number of ways)
|
|
*/
|
|
slw r5,r4,r5 /* r5 = cache block size */
|
|
|
|
rlwinm r7,r3,0,0xff /* Extract number of KiB in the cache */
|
|
mulli r7,r7,13 /* An 8-way cache will require 13
|
|
* loads per set.
|
|
*/
|
|
slw r7,r7,r6
|
|
|
|
/* save off HID0 and set DCFA */
|
|
mfspr r8,SPRN_HID0
|
|
ori r9,r8,HID0_DCFA@l
|
|
mtspr SPRN_HID0,r9
|
|
isync
|
|
|
|
lis r4,KERNELBASE@h
|
|
mtctr r7
|
|
|
|
1: lwz r3,0(r4) /* Load... */
|
|
add r4,r4,r5
|
|
bdnz 1b
|
|
|
|
msync
|
|
lis r4,KERNELBASE@h
|
|
mtctr r7
|
|
|
|
1: dcbf 0,r4 /* ...and flush. */
|
|
add r4,r4,r5
|
|
bdnz 1b
|
|
|
|
/* restore HID0 */
|
|
mtspr SPRN_HID0,r8
|
|
isync
|
|
|
|
blr
|
|
|
|
#ifdef CONFIG_SMP
|
|
/* When we get here, r24 needs to hold the CPU # */
|
|
.globl __secondary_start
|
|
__secondary_start:
|
|
lis r3,__secondary_hold_acknowledge@h
|
|
ori r3,r3,__secondary_hold_acknowledge@l
|
|
stw r24,0(r3)
|
|
|
|
li r3,0
|
|
mr r4,r24 /* Why? */
|
|
bl call_setup_cpu
|
|
|
|
lis r3,tlbcam_index@ha
|
|
lwz r3,tlbcam_index@l(r3)
|
|
mtctr r3
|
|
li r26,0 /* r26 safe? */
|
|
|
|
/* Load each CAM entry */
|
|
1: mr r3,r26
|
|
bl loadcam_entry
|
|
addi r26,r26,1
|
|
bdnz 1b
|
|
|
|
/* get current_thread_info and current */
|
|
lis r1,secondary_ti@ha
|
|
lwz r1,secondary_ti@l(r1)
|
|
lwz r2,TI_TASK(r1)
|
|
|
|
/* stack */
|
|
addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
|
|
li r0,0
|
|
stw r0,0(r1)
|
|
|
|
/* ptr to current thread */
|
|
addi r4,r2,THREAD /* address of our thread_struct */
|
|
mtspr SPRN_SPRG3,r4
|
|
|
|
/* Setup the defaults for TLB entries */
|
|
li r4,(MAS4_TSIZED(BOOKE_PAGESZ_4K))@l
|
|
mtspr SPRN_MAS4,r4
|
|
|
|
/* Jump to start_secondary */
|
|
lis r4,MSR_KERNEL@h
|
|
ori r4,r4,MSR_KERNEL@l
|
|
lis r3,start_secondary@h
|
|
ori r3,r3,start_secondary@l
|
|
mtspr SPRN_SRR0,r3
|
|
mtspr SPRN_SRR1,r4
|
|
sync
|
|
rfi
|
|
sync
|
|
|
|
.globl __secondary_hold_acknowledge
|
|
__secondary_hold_acknowledge:
|
|
.long -1
|
|
#endif
|
|
|
|
/*
|
|
* We put a few things here that have to be page-aligned. This stuff
|
|
* goes at the beginning of the data segment, which is page-aligned.
|
|
*/
|
|
.data
|
|
.align 12
|
|
.globl sdata
|
|
sdata:
|
|
.globl empty_zero_page
|
|
empty_zero_page:
|
|
.space 4096
|
|
.globl swapper_pg_dir
|
|
swapper_pg_dir:
|
|
.space PGD_TABLE_SIZE
|
|
|
|
/*
|
|
* Room for two PTE pointers, usually the kernel and current user pointers
|
|
* to their respective root page table.
|
|
*/
|
|
abatron_pteptrs:
|
|
.space 8
|