forked from Minki/linux
eb0cd5fd29
The architecture allows for "Book-E" style debug interrupts to either go to critial interrupts of their own debug interrupt level. To allow for a dynamic kernel to support machines of either type we want to be able to compile in the interrupt handling code for both exception levels. Towards this goal we renamed the debug handling macros to specify the interrupt level in their name (DEBUG_CRIT_EXCEPTION/DebugCrit and DEBUG_DEBUG_EXCEPTION/DebugDebug). Additionally, on the Freescale Book-e parts we expanded the exception stacks to cover the maximum case of needing three exception stacks (normal, machine check and debug). There is some kernel text space optimization to be gained if a kernel is configured for a specific Freescale implementation but we aren't handling that now to allow for the single kernel image support. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
1087 lines
26 KiB
ArmAsm
1087 lines
26 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 "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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/* 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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#ifdef CONFIG_SMP
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tlbsync
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#endif
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/* Invalidate TLB1 */
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li r6,0x0c
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tlbivax 0,r6
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#ifdef CONFIG_SMP
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tlbsync
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#endif
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msync
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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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#ifdef CONFIG_SMP
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tlbsync
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#endif
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msync
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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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li r7,0
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lis r6,PAGE_OFFSET@h
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ori r6,r6,PAGE_OFFSET@l
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rlwimi r6,r7,0,20,31
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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@h
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ori r6,r6,KERNELBASE@l
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rlwimi r6,r7,0,20,31
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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,r6,24
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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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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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#ifdef CONFIG_SMP
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tlbsync
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#endif
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msync
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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)
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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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/* 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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/*
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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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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 PTE_FLAGS_OFFSET 4
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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 PTE_FLAGS_OFFSET 0
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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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* Interrupt vector entry code
|
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*
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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.
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*
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* Interrupt vectors are dynamically placed relative to the
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* interrupt prefix as determined by the address of interrupt_base.
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* The interrupt vectors offsets are programmed using the labels
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* for each interrupt vector entry.
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*
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* 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)
|
|
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
|
|
|
|
/*
|
|
* Check if it was a store fault, if not then bail
|
|
* because a user tried to access a kernel or
|
|
* read-protected page. Otherwise, get the
|
|
* offending address and handle it.
|
|
*/
|
|
mfspr r10, SPRN_ESR
|
|
andis. r10, r10, ESR_ST@h
|
|
beq 2f
|
|
|
|
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 0, r10, r11
|
|
bge 2f
|
|
|
|
/* Get the PGD for the current thread */
|
|
3:
|
|
mfspr r11,SPRN_SPRG3
|
|
lwz r11,PGDIR(r11)
|
|
4:
|
|
FIND_PTE
|
|
|
|
/* Are _PAGE_USER & _PAGE_RW set & _PAGE_HWWRITE not? */
|
|
andi. r13, r11, _PAGE_RW|_PAGE_USER|_PAGE_HWWRITE
|
|
cmpwi 0, r13, _PAGE_RW|_PAGE_USER
|
|
bne 2f /* Bail if not */
|
|
|
|
/* Update 'changed'. */
|
|
ori r11, r11, _PAGE_DIRTY|_PAGE_ACCESSED|_PAGE_HWWRITE
|
|
stw r11, PTE_FLAGS_OFFSET(r12) /* Update Linux page table */
|
|
|
|
/* MAS2 not updated as the entry does exist in the tlb, this
|
|
fault taken to detect state transition (eg: COW -> DIRTY)
|
|
*/
|
|
andi. r11, r11, _PAGE_HWEXEC
|
|
rlwimi r11, r11, 31, 27, 27 /* SX <- _PAGE_HWEXEC */
|
|
ori r11, r11, (MAS3_UW|MAS3_SW|MAS3_UR|MAS3_SR)@l /* set static perms */
|
|
|
|
/* update search PID in MAS6, AS = 0 */
|
|
mfspr r12, SPRN_PID0
|
|
slwi r12, r12, 16
|
|
mtspr SPRN_MAS6, r12
|
|
|
|
/* find the TLB index that caused the fault. It has to be here. */
|
|
tlbsx 0, r10
|
|
|
|
/* only update the perm bits, assume the RPN is fine */
|
|
mfspr r12, SPRN_MAS3
|
|
rlwimi r12, r11, 0, 20, 31
|
|
mtspr SPRN_MAS3,r12
|
|
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 */
|
|
|
|
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 data_access
|
|
|
|
/* 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:
|
|
FIND_PTE
|
|
andi. r13, r11, _PAGE_PRESENT /* Is the page present? */
|
|
beq 2f /* Bail if not present */
|
|
|
|
#ifdef CONFIG_PTE_64BIT
|
|
lwz r13, 0(r12)
|
|
#endif
|
|
ori r11, r11, _PAGE_ACCESSED
|
|
stw r11, PTE_FLAGS_OFFSET(r12)
|
|
|
|
/* 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 data_access
|
|
|
|
/* 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:
|
|
FIND_PTE
|
|
andi. r13, r11, _PAGE_PRESENT /* Is the page present? */
|
|
beq 2f /* Bail if not present */
|
|
|
|
#ifdef CONFIG_PTE_64BIT
|
|
lwz r13, 0(r12)
|
|
#endif
|
|
ori r11, r11, _PAGE_ACCESSED
|
|
stw r11, PTE_FLAGS_OFFSET(r12)
|
|
|
|
/* 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);
|
|
#else
|
|
EXCEPTION(0x2040, SPEFloatingPointData, unknown_exception, EXC_XFER_EE)
|
|
#endif /* CONFIG_SPE */
|
|
|
|
/* SPE Floating Point Round */
|
|
EXCEPTION(0x2050, SPEFloatingPointRound, unknown_exception, EXC_XFER_EE)
|
|
|
|
/* Performance Monitor */
|
|
EXCEPTION(0x2060, PerformanceMonitor, performance_monitor_exception, EXC_XFER_STD)
|
|
|
|
|
|
/* Debug Interrupt */
|
|
DEBUG_DEBUG_EXCEPTION
|
|
#if defined(CONFIG_E500)
|
|
DEBUG_CRIT_EXCEPTION
|
|
#endif
|
|
|
|
/*
|
|
* Local functions
|
|
*/
|
|
|
|
/*
|
|
* Data TLB exceptions will bail out to this point
|
|
* if they can't resolve the lightweight TLB fault.
|
|
*/
|
|
data_access:
|
|
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)
|
|
|
|
/*
|
|
|
|
* Both the instruction and data TLB miss get to this
|
|
* point to load the TLB.
|
|
* r10 - EA of fault
|
|
* r11 - TLB (info from Linux PTE)
|
|
* r12, r13 - 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
|
|
mtspr SPRN_MAS2, r12
|
|
|
|
bge 5, 1f
|
|
|
|
/* is user addr */
|
|
andi. r12, r11, (_PAGE_USER | _PAGE_HWWRITE | _PAGE_HWEXEC)
|
|
andi. r10, r11, _PAGE_USER /* Test for _PAGE_USER */
|
|
srwi r10, r12, 1
|
|
or r12, r12, r10 /* Copy user perms into supervisor */
|
|
iseleq r12, 0, r12
|
|
b 2f
|
|
|
|
/* is kernel addr */
|
|
1: rlwinm r12, r11, 31, 29, 29 /* Extract _PAGE_HWWRITE into SW */
|
|
ori r12, r12, (MAS3_SX | MAS3_SR)
|
|
|
|
#ifdef CONFIG_PTE_64BIT
|
|
2: 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_FTR_SECTION
|
|
srwi r10, r13, 8 /* grab RPN[8:31] */
|
|
mtspr SPRN_MAS7, r10
|
|
END_FTR_SECTION_IFSET(CPU_FTR_BIG_PHYS)
|
|
#else
|
|
2: 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
|
|
|
|
/*
|
|
* 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
|
|
|
|
/* Reserved 4k for the critical exception stack & 4k for the machine
|
|
* check stack per CPU for kernel mode exceptions */
|
|
.section .bss
|
|
.align 12
|
|
exception_stack_bottom:
|
|
.space BOOKE_EXCEPTION_STACK_SIZE * NR_CPUS
|
|
.globl exception_stack_top
|
|
exception_stack_top:
|
|
|
|
/*
|
|
* Room for two PTE pointers, usually the kernel and current user pointers
|
|
* to their respective root page table.
|
|
*/
|
|
abatron_pteptrs:
|
|
.space 8
|