1238 строки
31 KiB
ArmAsm
1238 строки
31 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/init.h>
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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 <asm/ptrace.h>
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#include <asm/export.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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__HEAD
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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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/* Translate device tree address to physical, save in r30/r31 */
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bl get_phys_addr
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mr r30,r3
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mr r31,r4
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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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#ifdef CONFIG_RELOCATABLE
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LOAD_REG_ADDR_PIC(r3, _stext) /* Get our current runtime base */
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/* Translate _stext address to physical, save in r23/r25 */
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bl get_phys_addr
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mr r23,r3
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mr r25,r4
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bl 0f
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0: mflr r8
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addis r3,r8,(is_second_reloc - 0b)@ha
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lwz r19,(is_second_reloc - 0b)@l(r3)
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/* Check if this is the second relocation. */
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cmpwi r19,1
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bne 1f
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/*
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* For the second relocation, we already get the real memstart_addr
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* from device tree. So we will map PAGE_OFFSET to memstart_addr,
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* then the virtual address of start kernel should be:
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* PAGE_OFFSET + (kernstart_addr - memstart_addr)
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* Since the offset between kernstart_addr and memstart_addr should
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* never be beyond 1G, so we can just use the lower 32bit of them
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* for the calculation.
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*/
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lis r3,PAGE_OFFSET@h
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addis r4,r8,(kernstart_addr - 0b)@ha
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addi r4,r4,(kernstart_addr - 0b)@l
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lwz r5,4(r4)
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addis r6,r8,(memstart_addr - 0b)@ha
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addi r6,r6,(memstart_addr - 0b)@l
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lwz r7,4(r6)
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subf r5,r7,r5
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add r3,r3,r5
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b 2f
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1:
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/*
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* We have the runtime (virutal) address of our base.
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* We calculate our shift of offset from a 64M page.
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* We could map the 64M page we belong to at PAGE_OFFSET and
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* get going from there.
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*/
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lis r4,KERNELBASE@h
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ori r4,r4,KERNELBASE@l
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rlwinm r6,r25,0,0x3ffffff /* r6 = PHYS_START % 64M */
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rlwinm r5,r4,0,0x3ffffff /* r5 = KERNELBASE % 64M */
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subf r3,r5,r6 /* r3 = r6 - r5 */
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add r3,r4,r3 /* Required Virtual Address */
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2: bl relocate
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/*
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* For the second relocation, we already set the right tlb entries
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* for the kernel space, so skip the code in fsl_booke_entry_mapping.S
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*/
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cmpwi r19,1
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beq set_ivor
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#endif
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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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#define ENTRY_MAPPING_BOOT_SETUP
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#include "fsl_booke_entry_mapping.S"
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#undef ENTRY_MAPPING_BOOT_SETUP
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set_ivor:
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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, DebugCrit);
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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(BOOK3E_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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#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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LOAD_REG_ADDR_PIC(r24, boot_cpuid)
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lwz r24, 0(r24)
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cmpwi r24, -1
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mfspr r24,SPRN_PIR
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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_SPRG_THREAD,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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CURRENT_THREAD_INFO(r22, r1)
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stw r24, TI_CPU(r22)
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bl early_init
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#ifdef CONFIG_RELOCATABLE
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mr r3,r30
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mr r4,r31
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#ifdef CONFIG_PHYS_64BIT
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mr r5,r23
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mr r6,r25
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#else
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mr r5,r25
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#endif
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bl relocate_init
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#endif
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#ifdef CONFIG_DYNAMIC_MEMSTART
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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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/*
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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,r30
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mr r4,r31
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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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* r10 is the pshift from the PGD, if we're a hugepage
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*/
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#ifdef CONFIG_PTE_64BIT
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#ifdef CONFIG_HUGETLB_PAGE
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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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blt 1000f; /* Normal non-huge page */ \
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beq 2f; /* Bail if no table */ \
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oris r11, r11, PD_HUGE@h; /* Put back address bit */ \
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andi. r10, r11, HUGEPD_SHIFT_MASK@l; /* extract size field */ \
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xor r12, r10, r11; /* drop size bits from pointer */ \
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b 1001f; \
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1000: rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \
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li r10, 0; /* clear r10 */ \
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1001: lwz r11, 4(r12); /* Get pte entry */
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#else
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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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#endif /* HUGEPAGE */
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#else /* !PTE_64BIT */
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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.
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* We align on a 32 byte cache line boundary for good measure.
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*/
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interrupt_base:
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/* Critical Input Interrupt */
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CRITICAL_EXCEPTION(0x0100, CRITICAL, CriticalInput, unknown_exception)
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/* Machine Check Interrupt */
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#ifdef CONFIG_E200
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/* no RFMCI, MCSRRs on E200 */
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CRITICAL_EXCEPTION(0x0200, MACHINE_CHECK, MachineCheck, \
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machine_check_exception)
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#else
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MCHECK_EXCEPTION(0x0200, MachineCheck, machine_check_exception)
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#endif
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/* Data Storage Interrupt */
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START_EXCEPTION(DataStorage)
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NORMAL_EXCEPTION_PROLOG(DATA_STORAGE)
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mfspr r5,SPRN_ESR /* Grab the ESR, save it, pass arg3 */
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stw r5,_ESR(r11)
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mfspr r4,SPRN_DEAR /* Grab the DEAR, save it, pass arg2 */
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andis. r10,r5,(ESR_ILK|ESR_DLK)@h
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bne 1f
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EXC_XFER_LITE(0x0300, handle_page_fault)
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1:
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addi r3,r1,STACK_FRAME_OVERHEAD
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EXC_XFER_EE_LITE(0x0300, CacheLockingException)
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/* Instruction Storage Interrupt */
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INSTRUCTION_STORAGE_EXCEPTION
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/* External Input Interrupt */
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EXCEPTION(0x0500, EXTERNAL, ExternalInput, do_IRQ, EXC_XFER_LITE)
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/* Alignment Interrupt */
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ALIGNMENT_EXCEPTION
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/* Program Interrupt */
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PROGRAM_EXCEPTION
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/* Floating Point Unavailable Interrupt */
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#ifdef CONFIG_PPC_FPU
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FP_UNAVAILABLE_EXCEPTION
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#else
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#ifdef CONFIG_E200
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/* E200 treats 'normal' floating point instructions as FP Unavail exception */
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EXCEPTION(0x0800, FP_UNAVAIL, FloatingPointUnavailable, \
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program_check_exception, EXC_XFER_EE)
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#else
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EXCEPTION(0x0800, FP_UNAVAIL, FloatingPointUnavailable, \
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unknown_exception, EXC_XFER_EE)
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#endif
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#endif
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/* System Call Interrupt */
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START_EXCEPTION(SystemCall)
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NORMAL_EXCEPTION_PROLOG(SYSCALL)
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EXC_XFER_EE_LITE(0x0c00, DoSyscall)
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/* Auxiliary Processor Unavailable Interrupt */
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EXCEPTION(0x2900, AP_UNAVAIL, AuxillaryProcessorUnavailable, \
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unknown_exception, EXC_XFER_EE)
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/* Decrementer Interrupt */
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DECREMENTER_EXCEPTION
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/* Fixed Internal Timer Interrupt */
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/* TODO: Add FIT support */
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EXCEPTION(0x3100, FIT, FixedIntervalTimer, \
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unknown_exception, EXC_XFER_EE)
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/* Watchdog Timer Interrupt */
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#ifdef CONFIG_BOOKE_WDT
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CRITICAL_EXCEPTION(0x3200, WATCHDOG, WatchdogTimer, WatchdogException)
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#else
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CRITICAL_EXCEPTION(0x3200, WATCHDOG, WatchdogTimer, unknown_exception)
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#endif
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/* Data TLB Error Interrupt */
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START_EXCEPTION(DataTLBError)
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mtspr SPRN_SPRG_WSCRATCH0, r10 /* Save some working registers */
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mfspr r10, SPRN_SPRG_THREAD
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stw r11, THREAD_NORMSAVE(0)(r10)
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#ifdef CONFIG_KVM_BOOKE_HV
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BEGIN_FTR_SECTION
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mfspr r11, SPRN_SRR1
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END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
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#endif
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stw r12, THREAD_NORMSAVE(1)(r10)
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stw r13, THREAD_NORMSAVE(2)(r10)
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mfcr r13
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stw r13, THREAD_NORMSAVE(3)(r10)
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DO_KVM BOOKE_INTERRUPT_DTLB_MISS SPRN_SRR1
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mfspr r10, SPRN_DEAR /* Get faulting address */
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/* If we are faulting a kernel address, we have to use the
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* kernel page tables.
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*/
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lis r11, PAGE_OFFSET@h
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cmplw 5, r10, r11
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blt 5, 3f
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lis r11, swapper_pg_dir@h
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ori r11, r11, swapper_pg_dir@l
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mfspr r12,SPRN_MAS1 /* Set TID to 0 */
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rlwinm r12,r12,0,16,1
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mtspr SPRN_MAS1,r12
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b 4f
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/* Get the PGD for the current thread */
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3:
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mfspr r11,SPRN_SPRG_THREAD
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lwz r11,PGDIR(r11)
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4:
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/* Mask of required permission bits. Note that while we
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|
* 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
|
|
#ifdef CONFIG_PTE_64BIT
|
|
li r13,_PAGE_PRESENT
|
|
oris r13,r13,_PAGE_ACCESSED@h
|
|
#else
|
|
li r13,_PAGE_PRESENT|_PAGE_ACCESSED
|
|
#endif
|
|
rlwimi r13,r12,11,29,29
|
|
|
|
FIND_PTE
|
|
andc. r13,r13,r11 /* Check permission */
|
|
|
|
#ifdef CONFIG_PTE_64BIT
|
|
#ifdef CONFIG_SMP
|
|
subf r13,r11,r12 /* create false data dep */
|
|
lwzx r13,r11,r13 /* 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 r10, SPRN_SPRG_THREAD
|
|
lwz r11, THREAD_NORMSAVE(3)(r10)
|
|
mtcr r11
|
|
lwz r13, THREAD_NORMSAVE(2)(r10)
|
|
lwz r12, THREAD_NORMSAVE(1)(r10)
|
|
lwz r11, THREAD_NORMSAVE(0)(r10)
|
|
mfspr r10, SPRN_SPRG_RSCRATCH0
|
|
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_SPRG_WSCRATCH0, r10 /* Save some working registers */
|
|
mfspr r10, SPRN_SPRG_THREAD
|
|
stw r11, THREAD_NORMSAVE(0)(r10)
|
|
#ifdef CONFIG_KVM_BOOKE_HV
|
|
BEGIN_FTR_SECTION
|
|
mfspr r11, SPRN_SRR1
|
|
END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
|
|
#endif
|
|
stw r12, THREAD_NORMSAVE(1)(r10)
|
|
stw r13, THREAD_NORMSAVE(2)(r10)
|
|
mfcr r13
|
|
stw r13, THREAD_NORMSAVE(3)(r10)
|
|
DO_KVM BOOKE_INTERRUPT_ITLB_MISS SPRN_SRR1
|
|
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
|
|
|
|
/* Make up the required permissions for kernel code */
|
|
#ifdef CONFIG_PTE_64BIT
|
|
li r13,_PAGE_PRESENT | _PAGE_BAP_SX
|
|
oris r13,r13,_PAGE_ACCESSED@h
|
|
#else
|
|
li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC
|
|
#endif
|
|
b 4f
|
|
|
|
/* Get the PGD for the current thread */
|
|
3:
|
|
mfspr r11,SPRN_SPRG_THREAD
|
|
lwz r11,PGDIR(r11)
|
|
|
|
/* Make up the required permissions for user code */
|
|
#ifdef CONFIG_PTE_64BIT
|
|
li r13,_PAGE_PRESENT | _PAGE_BAP_UX
|
|
oris r13,r13,_PAGE_ACCESSED@h
|
|
#else
|
|
li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC
|
|
#endif
|
|
|
|
4:
|
|
FIND_PTE
|
|
andc. r13,r13,r11 /* Check permission */
|
|
|
|
#ifdef CONFIG_PTE_64BIT
|
|
#ifdef CONFIG_SMP
|
|
subf r13,r11,r12 /* create false data dep */
|
|
lwzx r13,r11,r13 /* 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 r10, SPRN_SPRG_THREAD
|
|
lwz r11, THREAD_NORMSAVE(3)(r10)
|
|
mtcr r11
|
|
lwz r13, THREAD_NORMSAVE(2)(r10)
|
|
lwz r12, THREAD_NORMSAVE(1)(r10)
|
|
lwz r11, THREAD_NORMSAVE(0)(r10)
|
|
mfspr r10, SPRN_SPRG_RSCRATCH0
|
|
b InstructionStorage
|
|
|
|
/* Define SPE handlers for e200 and e500v2 */
|
|
#ifdef CONFIG_SPE
|
|
/* SPE Unavailable */
|
|
START_EXCEPTION(SPEUnavailable)
|
|
NORMAL_EXCEPTION_PROLOG(SPE_UNAVAIL)
|
|
beq 1f
|
|
bl load_up_spe
|
|
b fast_exception_return
|
|
1: addi r3,r1,STACK_FRAME_OVERHEAD
|
|
EXC_XFER_EE_LITE(0x2010, KernelSPE)
|
|
#elif defined(CONFIG_SPE_POSSIBLE)
|
|
EXCEPTION(0x2020, SPE_UNAVAIL, SPEUnavailable, \
|
|
unknown_exception, EXC_XFER_EE)
|
|
#endif /* CONFIG_SPE_POSSIBLE */
|
|
|
|
/* SPE Floating Point Data */
|
|
#ifdef CONFIG_SPE
|
|
EXCEPTION(0x2030, SPE_FP_DATA, SPEFloatingPointData,
|
|
SPEFloatingPointException, EXC_XFER_EE)
|
|
|
|
/* SPE Floating Point Round */
|
|
EXCEPTION(0x2050, SPE_FP_ROUND, SPEFloatingPointRound, \
|
|
SPEFloatingPointRoundException, EXC_XFER_EE)
|
|
#elif defined(CONFIG_SPE_POSSIBLE)
|
|
EXCEPTION(0x2040, SPE_FP_DATA, SPEFloatingPointData,
|
|
unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x2050, SPE_FP_ROUND, SPEFloatingPointRound, \
|
|
unknown_exception, EXC_XFER_EE)
|
|
#endif /* CONFIG_SPE_POSSIBLE */
|
|
|
|
|
|
/* Performance Monitor */
|
|
EXCEPTION(0x2060, PERFORMANCE_MONITOR, PerformanceMonitor, \
|
|
performance_monitor_exception, EXC_XFER_STD)
|
|
|
|
EXCEPTION(0x2070, DOORBELL, Doorbell, doorbell_exception, EXC_XFER_STD)
|
|
|
|
CRITICAL_EXCEPTION(0x2080, DOORBELL_CRITICAL, \
|
|
CriticalDoorbell, unknown_exception)
|
|
|
|
/* Debug Interrupt */
|
|
DEBUG_DEBUG_EXCEPTION
|
|
DEBUG_CRIT_EXCEPTION
|
|
|
|
GUEST_DOORBELL_EXCEPTION
|
|
|
|
CRITICAL_EXCEPTION(0, GUEST_DBELL_CRIT, CriticalGuestDoorbell, \
|
|
unknown_exception)
|
|
|
|
/* Hypercall */
|
|
EXCEPTION(0, HV_SYSCALL, Hypercall, unknown_exception, EXC_XFER_EE)
|
|
|
|
/* Embedded Hypervisor Privilege */
|
|
EXCEPTION(0, HV_PRIV, Ehvpriv, unknown_exception, EXC_XFER_EE)
|
|
|
|
interrupt_end:
|
|
|
|
/*
|
|
* Local functions
|
|
*/
|
|
|
|
/*
|
|
* Both the instruction and data TLB miss get to this
|
|
* point to load the TLB.
|
|
* r10 - tsize encoding (if HUGETLB_PAGE) or 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:
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
cmpwi 6, r10, 0 /* check for huge page */
|
|
beq 6, finish_tlb_load_cont /* !huge */
|
|
|
|
/* Alas, we need more scratch registers for hugepages */
|
|
mfspr r12, SPRN_SPRG_THREAD
|
|
stw r14, THREAD_NORMSAVE(4)(r12)
|
|
stw r15, THREAD_NORMSAVE(5)(r12)
|
|
stw r16, THREAD_NORMSAVE(6)(r12)
|
|
stw r17, THREAD_NORMSAVE(7)(r12)
|
|
|
|
/* Get the next_tlbcam_idx percpu var */
|
|
#ifdef CONFIG_SMP
|
|
lwz r12, THREAD_INFO-THREAD(r12)
|
|
lwz r15, TI_CPU(r12)
|
|
lis r14, __per_cpu_offset@h
|
|
ori r14, r14, __per_cpu_offset@l
|
|
rlwinm r15, r15, 2, 0, 29
|
|
lwzx r16, r14, r15
|
|
#else
|
|
li r16, 0
|
|
#endif
|
|
lis r17, next_tlbcam_idx@h
|
|
ori r17, r17, next_tlbcam_idx@l
|
|
add r17, r17, r16 /* r17 = *next_tlbcam_idx */
|
|
lwz r15, 0(r17) /* r15 = next_tlbcam_idx */
|
|
|
|
lis r14, MAS0_TLBSEL(1)@h /* select TLB1 (TLBCAM) */
|
|
rlwimi r14, r15, 16, 4, 15 /* next_tlbcam_idx entry */
|
|
mtspr SPRN_MAS0, r14
|
|
|
|
/* Extract TLB1CFG(NENTRY) */
|
|
mfspr r16, SPRN_TLB1CFG
|
|
andi. r16, r16, 0xfff
|
|
|
|
/* Update next_tlbcam_idx, wrapping when necessary */
|
|
addi r15, r15, 1
|
|
cmpw r15, r16
|
|
blt 100f
|
|
lis r14, tlbcam_index@h
|
|
ori r14, r14, tlbcam_index@l
|
|
lwz r15, 0(r14)
|
|
100: stw r15, 0(r17)
|
|
|
|
/*
|
|
* Calc MAS1_TSIZE from r10 (which has pshift encoded)
|
|
* tlb_enc = (pshift - 10).
|
|
*/
|
|
subi r15, r10, 10
|
|
mfspr r16, SPRN_MAS1
|
|
rlwimi r16, r15, 7, 20, 24
|
|
mtspr SPRN_MAS1, r16
|
|
|
|
/* copy the pshift for use later */
|
|
mr r14, r10
|
|
|
|
/* fall through */
|
|
|
|
#endif /* CONFIG_HUGETLB_PAGE */
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
finish_tlb_load_cont:
|
|
#ifdef CONFIG_PTE_64BIT
|
|
rlwinm r12, r11, 32-2, 26, 31 /* Move in perm bits */
|
|
andi. r10, r11, _PAGE_DIRTY
|
|
bne 1f
|
|
li r10, MAS3_SW | MAS3_UW
|
|
andc r12, r12, r10
|
|
1: rlwimi r12, r13, 20, 0, 11 /* grab RPN[32:43] */
|
|
rlwimi r12, r11, 20, 12, 19 /* grab RPN[44:51] */
|
|
2: mtspr SPRN_MAS3, r12
|
|
BEGIN_MMU_FTR_SECTION
|
|
srwi r10, r13, 12 /* grab RPN[12:31] */
|
|
mtspr SPRN_MAS7, r10
|
|
END_MMU_FTR_SECTION_IFSET(MMU_FTR_BIG_PHYS)
|
|
#else
|
|
li r10, (_PAGE_EXEC | _PAGE_PRESENT)
|
|
mr r13, r11
|
|
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
|
|
rlwimi r13, r12, 0, 20, 31 /* Get RPN from PTE, merge w/ perms */
|
|
mtspr SPRN_MAS3, r13
|
|
#endif
|
|
|
|
mfspr r12, SPRN_MAS2
|
|
#ifdef CONFIG_PTE_64BIT
|
|
rlwimi r12, r11, 32-19, 27, 31 /* extract WIMGE from pte */
|
|
#else
|
|
rlwimi r12, r11, 26, 27, 31 /* extract WIMGE from pte */
|
|
#endif
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
beq 6, 3f /* don't mask if page isn't huge */
|
|
li r13, 1
|
|
slw r13, r13, r14
|
|
subi r13, r13, 1
|
|
rlwinm r13, r13, 0, 0, 19 /* bottom bits used for WIMGE/etc */
|
|
andc r12, r12, r13 /* mask off ea bits within the page */
|
|
#endif
|
|
3: mtspr SPRN_MAS2, r12
|
|
|
|
#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 */
|
|
|
|
tlb_write_entry:
|
|
tlbwe
|
|
|
|
/* Done...restore registers and get out of here. */
|
|
mfspr r10, SPRN_SPRG_THREAD
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
beq 6, 8f /* skip restore for 4k page faults */
|
|
lwz r14, THREAD_NORMSAVE(4)(r10)
|
|
lwz r15, THREAD_NORMSAVE(5)(r10)
|
|
lwz r16, THREAD_NORMSAVE(6)(r10)
|
|
lwz r17, THREAD_NORMSAVE(7)(r10)
|
|
#endif
|
|
8: lwz r11, THREAD_NORMSAVE(3)(r10)
|
|
mtcr r11
|
|
lwz r13, THREAD_NORMSAVE(2)(r10)
|
|
lwz r12, THREAD_NORMSAVE(1)(r10)
|
|
lwz r11, THREAD_NORMSAVE(0)(r10)
|
|
mfspr r10, SPRN_SPRG_RSCRATCH0
|
|
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! */
|
|
_GLOBAL(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
|
|
/* enable use of SPE after return */
|
|
oris r9,r9,MSR_SPE@h
|
|
mfspr r5,SPRN_SPRG_THREAD /* 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,THREAD_EVR0)
|
|
blr
|
|
|
|
/*
|
|
* 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 */
|
|
#ifdef CONFIG_PRINTK
|
|
lis r3,87f@h
|
|
ori r3,r3,87f@l
|
|
mr r4,r2 /* current */
|
|
lwz r5,_NIP(r1)
|
|
bl printk
|
|
#endif
|
|
b ret_from_except
|
|
#ifdef CONFIG_PRINTK
|
|
87: .string "SPE used in kernel (task=%p, pc=%x) \n"
|
|
#endif
|
|
.align 4,0
|
|
|
|
#endif /* CONFIG_SPE */
|
|
|
|
/*
|
|
* Translate the effec addr in r3 to phys addr. The phys addr will be put
|
|
* into r3(higher 32bit) and r4(lower 32bit)
|
|
*/
|
|
get_phys_addr:
|
|
mfmsr r8
|
|
mfspr r9,SPRN_PID
|
|
rlwinm r9,r9,16,0x3fff0000 /* turn PID into MAS6[SPID] */
|
|
rlwimi r9,r8,28,0x00000001 /* turn MSR[DS] into MAS6[SAS] */
|
|
mtspr SPRN_MAS6,r9
|
|
|
|
tlbsx 0,r3 /* must succeed */
|
|
|
|
mfspr r8,SPRN_MAS1
|
|
mfspr r12,SPRN_MAS3
|
|
rlwinm r9,r8,25,0x1f /* r9 = log2(page size) */
|
|
li r10,1024
|
|
slw r10,r10,r9 /* r10 = page size */
|
|
addi r10,r10,-1
|
|
and r11,r3,r10 /* r11 = page offset */
|
|
andc r4,r12,r10 /* r4 = page base */
|
|
or r4,r4,r11 /* r4 = devtree phys addr */
|
|
#ifdef CONFIG_PHYS_64BIT
|
|
mfspr r3,SPRN_MAS7
|
|
#endif
|
|
blr
|
|
|
|
/*
|
|
* Global functions
|
|
*/
|
|
|
|
#ifdef CONFIG_E200
|
|
/* Adjust or setup IVORs for e200 */
|
|
_GLOBAL(__setup_e200_ivors)
|
|
li r3,DebugDebug@l
|
|
mtspr SPRN_IVOR15,r3
|
|
li r3,SPEUnavailable@l
|
|
mtspr SPRN_IVOR32,r3
|
|
li r3,SPEFloatingPointData@l
|
|
mtspr SPRN_IVOR33,r3
|
|
li r3,SPEFloatingPointRound@l
|
|
mtspr SPRN_IVOR34,r3
|
|
sync
|
|
blr
|
|
#endif
|
|
|
|
#ifdef CONFIG_E500
|
|
#ifndef CONFIG_PPC_E500MC
|
|
/* Adjust or setup IVORs for e500v1/v2 */
|
|
_GLOBAL(__setup_e500_ivors)
|
|
li r3,DebugCrit@l
|
|
mtspr SPRN_IVOR15,r3
|
|
li r3,SPEUnavailable@l
|
|
mtspr SPRN_IVOR32,r3
|
|
li r3,SPEFloatingPointData@l
|
|
mtspr SPRN_IVOR33,r3
|
|
li r3,SPEFloatingPointRound@l
|
|
mtspr SPRN_IVOR34,r3
|
|
li r3,PerformanceMonitor@l
|
|
mtspr SPRN_IVOR35,r3
|
|
sync
|
|
blr
|
|
#else
|
|
/* Adjust or setup IVORs for e500mc */
|
|
_GLOBAL(__setup_e500mc_ivors)
|
|
li r3,DebugDebug@l
|
|
mtspr SPRN_IVOR15,r3
|
|
li r3,PerformanceMonitor@l
|
|
mtspr SPRN_IVOR35,r3
|
|
li r3,Doorbell@l
|
|
mtspr SPRN_IVOR36,r3
|
|
li r3,CriticalDoorbell@l
|
|
mtspr SPRN_IVOR37,r3
|
|
sync
|
|
blr
|
|
|
|
/* setup ehv ivors for */
|
|
_GLOBAL(__setup_ehv_ivors)
|
|
li r3,GuestDoorbell@l
|
|
mtspr SPRN_IVOR38,r3
|
|
li r3,CriticalGuestDoorbell@l
|
|
mtspr SPRN_IVOR39,r3
|
|
li r3,Hypercall@l
|
|
mtspr SPRN_IVOR40,r3
|
|
li r3,Ehvpriv@l
|
|
mtspr SPRN_IVOR41,r3
|
|
sync
|
|
blr
|
|
#endif /* CONFIG_PPC_E500MC */
|
|
#endif /* CONFIG_E500 */
|
|
|
|
#ifdef CONFIG_SPE
|
|
/*
|
|
* extern void __giveup_spe(struct task_struct *prev)
|
|
*
|
|
*/
|
|
_GLOBAL(__giveup_spe)
|
|
addi r3,r3,THREAD /* want THREAD of task */
|
|
lwz r5,PT_REGS(r3)
|
|
cmpi 0,r5,0
|
|
SAVE_32EVRS(0, r4, r3, THREAD_EVR0)
|
|
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 */
|
|
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:
|
|
blr
|
|
#endif /* CONFIG_SPE */
|
|
|
|
/*
|
|
* 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
|
|
|
|
#ifdef CONFIG_SMP
|
|
/* When we get here, r24 needs to hold the CPU # */
|
|
.globl __secondary_start
|
|
__secondary_start:
|
|
LOAD_REG_ADDR_PIC(r3, tlbcam_index)
|
|
lwz r3,0(r3)
|
|
mtctr r3
|
|
li r26,0 /* r26 safe? */
|
|
|
|
bl switch_to_as1
|
|
mr r27,r3 /* tlb entry */
|
|
/* Load each CAM entry */
|
|
1: mr r3,r26
|
|
bl loadcam_entry
|
|
addi r26,r26,1
|
|
bdnz 1b
|
|
mr r3,r27 /* tlb entry */
|
|
LOAD_REG_ADDR_PIC(r4, memstart_addr)
|
|
lwz r4,0(r4)
|
|
mr r5,r25 /* phys kernel start */
|
|
rlwinm r5,r5,0,~0x3ffffff /* aligned 64M */
|
|
subf r4,r5,r4 /* memstart_addr - phys kernel start */
|
|
li r5,0 /* no device tree */
|
|
li r6,0 /* not boot cpu */
|
|
bl restore_to_as0
|
|
|
|
|
|
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
|
|
|
|
/* 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_SPRG_THREAD,r4
|
|
|
|
/* Setup the defaults for TLB entries */
|
|
li r4,(MAS4_TSIZED(BOOK3E_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
|
|
|
|
/*
|
|
* Create a tlb entry with the same effective and physical address as
|
|
* the tlb entry used by the current running code. But set the TS to 1.
|
|
* Then switch to the address space 1. It will return with the r3 set to
|
|
* the ESEL of the new created tlb.
|
|
*/
|
|
_GLOBAL(switch_to_as1)
|
|
mflr r5
|
|
|
|
/* Find a entry not used */
|
|
mfspr r3,SPRN_TLB1CFG
|
|
andi. r3,r3,0xfff
|
|
mfspr r4,SPRN_PID
|
|
rlwinm r4,r4,16,0x3fff0000 /* turn PID into MAS6[SPID] */
|
|
mtspr SPRN_MAS6,r4
|
|
1: lis r4,0x1000 /* Set MAS0(TLBSEL) = 1 */
|
|
addi r3,r3,-1
|
|
rlwimi r4,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */
|
|
mtspr SPRN_MAS0,r4
|
|
tlbre
|
|
mfspr r4,SPRN_MAS1
|
|
andis. r4,r4,MAS1_VALID@h
|
|
bne 1b
|
|
|
|
/* Get the tlb entry used by the current running code */
|
|
bl 0f
|
|
0: mflr r4
|
|
tlbsx 0,r4
|
|
|
|
mfspr r4,SPRN_MAS1
|
|
ori r4,r4,MAS1_TS /* Set the TS = 1 */
|
|
mtspr SPRN_MAS1,r4
|
|
|
|
mfspr r4,SPRN_MAS0
|
|
rlwinm r4,r4,0,~MAS0_ESEL_MASK
|
|
rlwimi r4,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */
|
|
mtspr SPRN_MAS0,r4
|
|
tlbwe
|
|
isync
|
|
sync
|
|
|
|
mfmsr r4
|
|
ori r4,r4,MSR_IS | MSR_DS
|
|
mtspr SPRN_SRR0,r5
|
|
mtspr SPRN_SRR1,r4
|
|
sync
|
|
rfi
|
|
|
|
/*
|
|
* Restore to the address space 0 and also invalidate the tlb entry created
|
|
* by switch_to_as1.
|
|
* r3 - the tlb entry which should be invalidated
|
|
* r4 - __pa(PAGE_OFFSET in AS1) - __pa(PAGE_OFFSET in AS0)
|
|
* r5 - device tree virtual address. If r4 is 0, r5 is ignored.
|
|
* r6 - boot cpu
|
|
*/
|
|
_GLOBAL(restore_to_as0)
|
|
mflr r0
|
|
|
|
bl 0f
|
|
0: mflr r9
|
|
addi r9,r9,1f - 0b
|
|
|
|
/*
|
|
* We may map the PAGE_OFFSET in AS0 to a different physical address,
|
|
* so we need calculate the right jump and device tree address based
|
|
* on the offset passed by r4.
|
|
*/
|
|
add r9,r9,r4
|
|
add r5,r5,r4
|
|
add r0,r0,r4
|
|
|
|
2: mfmsr r7
|
|
li r8,(MSR_IS | MSR_DS)
|
|
andc r7,r7,r8
|
|
|
|
mtspr SPRN_SRR0,r9
|
|
mtspr SPRN_SRR1,r7
|
|
sync
|
|
rfi
|
|
|
|
/* Invalidate the temporary tlb entry for AS1 */
|
|
1: lis r9,0x1000 /* Set MAS0(TLBSEL) = 1 */
|
|
rlwimi r9,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */
|
|
mtspr SPRN_MAS0,r9
|
|
tlbre
|
|
mfspr r9,SPRN_MAS1
|
|
rlwinm r9,r9,0,2,31 /* Clear MAS1 Valid and IPPROT */
|
|
mtspr SPRN_MAS1,r9
|
|
tlbwe
|
|
isync
|
|
|
|
cmpwi r4,0
|
|
cmpwi cr1,r6,0
|
|
cror eq,4*cr1+eq,eq
|
|
bne 3f /* offset != 0 && is_boot_cpu */
|
|
mtlr r0
|
|
blr
|
|
|
|
/*
|
|
* The PAGE_OFFSET will map to a different physical address,
|
|
* jump to _start to do another relocation again.
|
|
*/
|
|
3: mr r3,r5
|
|
bl _start
|
|
|
|
/*
|
|
* 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
|
|
EXPORT_SYMBOL(empty_zero_page)
|
|
.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
|