linux/arch/powerpc/kernel/head_fsl_booke.S

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/*
* Kernel execution entry point code.
*
* Copyright (c) 1995-1996 Gary Thomas <gdt@linuxppc.org>
* Initial PowerPC version.
* Copyright (c) 1996 Cort Dougan <cort@cs.nmt.edu>
* Rewritten for PReP
* Copyright (c) 1996 Paul Mackerras <paulus@cs.anu.edu.au>
* Low-level exception handers, MMU support, and rewrite.
* Copyright (c) 1997 Dan Malek <dmalek@jlc.net>
* PowerPC 8xx modifications.
* Copyright (c) 1998-1999 TiVo, Inc.
* PowerPC 403GCX modifications.
* Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu>
* PowerPC 403GCX/405GP modifications.
* Copyright 2000 MontaVista Software Inc.
* PPC405 modifications
* PowerPC 403GCX/405GP modifications.
* Author: MontaVista Software, Inc.
* frank_rowand@mvista.com or source@mvista.com
* debbie_chu@mvista.com
* Copyright 2002-2004 MontaVista Software, Inc.
* PowerPC 44x support, Matt Porter <mporter@kernel.crashing.org>
* Copyright 2004 Freescale Semiconductor, Inc
* PowerPC e500 modifications, Kumar Gala <galak@kernel.crashing.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/init.h>
#include <linux/threads.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/cputable.h>
#include <asm/thread_info.h>
#include <asm/ppc_asm.h>
#include <asm/asm-offsets.h>
#include <asm/cache.h>
#include "head_booke.h"
/* As with the other PowerPC ports, it is expected that when code
* execution begins here, the following registers contain valid, yet
* optional, information:
*
* r3 - Board info structure pointer (DRAM, frequency, MAC address, etc.)
* r4 - Starting address of the init RAM disk
* r5 - Ending address of the init RAM disk
* r6 - Start of kernel command line string (e.g. "mem=128")
* r7 - End of kernel command line string
*
*/
__HEAD
_ENTRY(_stext);
_ENTRY(_start);
/*
* Reserve a word at a fixed location to store the address
* of abatron_pteptrs
*/
nop
/*
* Save parameters we are passed
*/
mr r31,r3
mr r30,r4
mr r29,r5
mr r28,r6
mr r27,r7
li r25,0 /* phys kernel start (low) */
li r24,0 /* CPU number */
li r23,0 /* phys kernel start (high) */
/* We try to not make any assumptions about how the boot loader
* setup or used the TLBs. We invalidate all mappings from the
* boot loader and load a single entry in TLB1[0] to map the
* first 64M of kernel memory. Any boot info passed from the
* bootloader needs to live in this first 64M.
*
* Requirement on bootloader:
* - The page we're executing in needs to reside in TLB1 and
* have IPROT=1. If not an invalidate broadcast could
* evict the entry we're currently executing in.
*
* r3 = Index of TLB1 were executing in
* r4 = Current MSR[IS]
* r5 = Index of TLB1 temp mapping
*
* Later in mapin_ram we will correctly map lowmem, and resize TLB1[0]
* if needed
*/
_ENTRY(__early_start)
/* 1. Find the index of the entry we're executing in */
bl invstr /* Find our address */
invstr: mflr r6 /* Make it accessible */
mfmsr r7
rlwinm r4,r7,27,31,31 /* extract MSR[IS] */
mfspr r7, SPRN_PID0
slwi r7,r7,16
or r7,r7,r4
mtspr SPRN_MAS6,r7
tlbsx 0,r6 /* search MSR[IS], SPID=PID0 */
mfspr r7,SPRN_MAS1
andis. r7,r7,MAS1_VALID@h
bne match_TLB
mfspr r7,SPRN_MMUCFG
rlwinm r7,r7,21,28,31 /* extract MMUCFG[NPIDS] */
cmpwi r7,3
bne match_TLB /* skip if NPIDS != 3 */
mfspr r7,SPRN_PID1
slwi r7,r7,16
or r7,r7,r4
mtspr SPRN_MAS6,r7
tlbsx 0,r6 /* search MSR[IS], SPID=PID1 */
mfspr r7,SPRN_MAS1
andis. r7,r7,MAS1_VALID@h
bne match_TLB
mfspr r7, SPRN_PID2
slwi r7,r7,16
or r7,r7,r4
mtspr SPRN_MAS6,r7
tlbsx 0,r6 /* Fall through, we had to match */
match_TLB:
mfspr r7,SPRN_MAS0
rlwinm r3,r7,16,20,31 /* Extract MAS0(Entry) */
mfspr r7,SPRN_MAS1 /* Insure IPROT set */
oris r7,r7,MAS1_IPROT@h
mtspr SPRN_MAS1,r7
tlbwe
/* 2. Invalidate all entries except the entry we're executing in */
mfspr r9,SPRN_TLB1CFG
andi. r9,r9,0xfff
li r6,0 /* Set Entry counter to 0 */
1: lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */
mtspr SPRN_MAS0,r7
tlbre
mfspr r7,SPRN_MAS1
rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */
cmpw r3,r6
beq skpinv /* Dont update the current execution TLB */
mtspr SPRN_MAS1,r7
tlbwe
isync
skpinv: addi r6,r6,1 /* Increment */
cmpw r6,r9 /* Are we done? */
bne 1b /* If not, repeat */
/* Invalidate TLB0 */
li r6,0x04
tlbivax 0,r6
TLBSYNC
/* Invalidate TLB1 */
li r6,0x0c
tlbivax 0,r6
TLBSYNC
/* 3. Setup a temp mapping and jump to it */
andi. r5, r3, 0x1 /* Find an entry not used and is non-zero */
addi r5, r5, 0x1
lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
rlwimi r7,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */
mtspr SPRN_MAS0,r7
tlbre
/* grab and fixup the RPN */
mfspr r6,SPRN_MAS1 /* extract MAS1[SIZE] */
rlwinm r6,r6,25,27,31
li r8,-1
addi r6,r6,10
slw r6,r8,r6 /* convert to mask */
bl 1f /* Find our address */
1: mflr r7
mfspr r8,SPRN_MAS3
#ifdef CONFIG_PHYS_64BIT
mfspr r23,SPRN_MAS7
#endif
and r8,r6,r8
subfic r9,r6,-4096
and r9,r9,r7
or r25,r8,r9
ori r8,r25,(MAS3_SX|MAS3_SW|MAS3_SR)
/* Just modify the entry ID and EPN for the temp mapping */
lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
rlwimi r7,r5,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r5) */
mtspr SPRN_MAS0,r7
xori r6,r4,1 /* Setup TMP mapping in the other Address space */
slwi r6,r6,12
oris r6,r6,(MAS1_VALID|MAS1_IPROT)@h
ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_4K))@l
mtspr SPRN_MAS1,r6
mfspr r6,SPRN_MAS2
li r7,0 /* temp EPN = 0 */
rlwimi r7,r6,0,20,31
mtspr SPRN_MAS2,r7
mtspr SPRN_MAS3,r8
tlbwe
xori r6,r4,1
slwi r6,r6,5 /* setup new context with other address space */
bl 1f /* Find our address */
1: mflr r9
rlwimi r7,r9,0,20,31
addi r7,r7,(2f - 1b)
mtspr SPRN_SRR0,r7
mtspr SPRN_SRR1,r6
rfi
2:
/* 4. Clear out PIDs & Search info */
li r6,0
mtspr SPRN_MAS6,r6
mtspr SPRN_PID0,r6
mfspr r7,SPRN_MMUCFG
rlwinm r7,r7,21,28,31 /* extract MMUCFG[NPIDS] */
cmpwi r7,3
bne 2f /* skip if NPIDS != 3 */
mtspr SPRN_PID1,r6
mtspr SPRN_PID2,r6
/* 5. Invalidate mapping we started in */
2:
lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
rlwimi r7,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */
mtspr SPRN_MAS0,r7
tlbre
mfspr r6,SPRN_MAS1
rlwinm r6,r6,0,2,0 /* clear IPROT */
mtspr SPRN_MAS1,r6
tlbwe
/* Invalidate TLB1 */
li r9,0x0c
tlbivax 0,r9
TLBSYNC
powerpc: Better setup of boot page TLB entry The initial TLB mapping for the kernel boot didn't set the memory coherent attribute, MAS2[M], in SMP mode. If this code supported booting a secondary processor, which it doesn't yet, but if it did, then when a secondary processor boots, it would probably signal the primary processor by setting a variable called something like __secondary_hold_acknowledge. However, due to the lack of the M bit, the primary processor would not snoop the transaction (even if a transaction were broadcast). If primary CPU's L1 D-cache had a copy, it would not be flushed and the CPU would never see the ack. Which would have resulted in the primary CPU spinning for a long time, perhaps a full second before it gives up, while it would have waited for the ack from the secondary CPU that it wouldn't have been able to see because of the stale cache. The value of MAS2 for the boot page TLB1 entry is a compile time constant, so there is no need to calculate it in powerpc assembly language. Also, from the MPC8572 manual section 6.12.5.3, "Bits that represent offsets within a page are ignored and should be cleared." Existing code didn't clear them, this code does. The same when the page of KERNELBASE is found; we don't need to use asm to mask the lower 12 bits off. In the code that computes the address to rfi from, don't hard code the offset to 24 bytes, but have the assembler figure that out for us. Signed-off-by: Trent Piepho <tpiepho@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2008-11-19 11:13:14 +00:00
/* The mapping only needs to be cache-coherent on SMP */
#ifdef CONFIG_SMP
#define M_IF_SMP MAS2_M
#else
#define M_IF_SMP 0
#endif
/* 6. Setup KERNELBASE mapping in TLB1[0] */
lis r6,0x1000 /* Set MAS0(TLBSEL) = TLB1(1), ESEL = 0 */
mtspr SPRN_MAS0,r6
lis r6,(MAS1_VALID|MAS1_IPROT)@h
ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_64M))@l
mtspr SPRN_MAS1,r6
lis r6,MAS2_VAL(PAGE_OFFSET, BOOK3E_PAGESZ_64M, M_IF_SMP)@h
ori r6,r6,MAS2_VAL(PAGE_OFFSET, BOOK3E_PAGESZ_64M, M_IF_SMP)@l
mtspr SPRN_MAS2,r6
mtspr SPRN_MAS3,r8
tlbwe
/* 7. Jump to KERNELBASE mapping */
powerpc: Better setup of boot page TLB entry The initial TLB mapping for the kernel boot didn't set the memory coherent attribute, MAS2[M], in SMP mode. If this code supported booting a secondary processor, which it doesn't yet, but if it did, then when a secondary processor boots, it would probably signal the primary processor by setting a variable called something like __secondary_hold_acknowledge. However, due to the lack of the M bit, the primary processor would not snoop the transaction (even if a transaction were broadcast). If primary CPU's L1 D-cache had a copy, it would not be flushed and the CPU would never see the ack. Which would have resulted in the primary CPU spinning for a long time, perhaps a full second before it gives up, while it would have waited for the ack from the secondary CPU that it wouldn't have been able to see because of the stale cache. The value of MAS2 for the boot page TLB1 entry is a compile time constant, so there is no need to calculate it in powerpc assembly language. Also, from the MPC8572 manual section 6.12.5.3, "Bits that represent offsets within a page are ignored and should be cleared." Existing code didn't clear them, this code does. The same when the page of KERNELBASE is found; we don't need to use asm to mask the lower 12 bits off. In the code that computes the address to rfi from, don't hard code the offset to 24 bytes, but have the assembler figure that out for us. Signed-off-by: Trent Piepho <tpiepho@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2008-11-19 11:13:14 +00:00
lis r6,(KERNELBASE & ~0xfff)@h
ori r6,r6,(KERNELBASE & ~0xfff)@l
lis r7,MSR_KERNEL@h
ori r7,r7,MSR_KERNEL@l
bl 1f /* Find our address */
1: mflr r9
rlwimi r6,r9,0,20,31
powerpc: Better setup of boot page TLB entry The initial TLB mapping for the kernel boot didn't set the memory coherent attribute, MAS2[M], in SMP mode. If this code supported booting a secondary processor, which it doesn't yet, but if it did, then when a secondary processor boots, it would probably signal the primary processor by setting a variable called something like __secondary_hold_acknowledge. However, due to the lack of the M bit, the primary processor would not snoop the transaction (even if a transaction were broadcast). If primary CPU's L1 D-cache had a copy, it would not be flushed and the CPU would never see the ack. Which would have resulted in the primary CPU spinning for a long time, perhaps a full second before it gives up, while it would have waited for the ack from the secondary CPU that it wouldn't have been able to see because of the stale cache. The value of MAS2 for the boot page TLB1 entry is a compile time constant, so there is no need to calculate it in powerpc assembly language. Also, from the MPC8572 manual section 6.12.5.3, "Bits that represent offsets within a page are ignored and should be cleared." Existing code didn't clear them, this code does. The same when the page of KERNELBASE is found; we don't need to use asm to mask the lower 12 bits off. In the code that computes the address to rfi from, don't hard code the offset to 24 bytes, but have the assembler figure that out for us. Signed-off-by: Trent Piepho <tpiepho@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2008-11-19 11:13:14 +00:00
addi r6,r6,(2f - 1b)
mtspr SPRN_SRR0,r6
mtspr SPRN_SRR1,r7
rfi /* start execution out of TLB1[0] entry */
/* 8. Clear out the temp mapping */
powerpc: Better setup of boot page TLB entry The initial TLB mapping for the kernel boot didn't set the memory coherent attribute, MAS2[M], in SMP mode. If this code supported booting a secondary processor, which it doesn't yet, but if it did, then when a secondary processor boots, it would probably signal the primary processor by setting a variable called something like __secondary_hold_acknowledge. However, due to the lack of the M bit, the primary processor would not snoop the transaction (even if a transaction were broadcast). If primary CPU's L1 D-cache had a copy, it would not be flushed and the CPU would never see the ack. Which would have resulted in the primary CPU spinning for a long time, perhaps a full second before it gives up, while it would have waited for the ack from the secondary CPU that it wouldn't have been able to see because of the stale cache. The value of MAS2 for the boot page TLB1 entry is a compile time constant, so there is no need to calculate it in powerpc assembly language. Also, from the MPC8572 manual section 6.12.5.3, "Bits that represent offsets within a page are ignored and should be cleared." Existing code didn't clear them, this code does. The same when the page of KERNELBASE is found; we don't need to use asm to mask the lower 12 bits off. In the code that computes the address to rfi from, don't hard code the offset to 24 bytes, but have the assembler figure that out for us. Signed-off-by: Trent Piepho <tpiepho@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2008-11-19 11:13:14 +00:00
2: lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
rlwimi r7,r5,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r5) */
mtspr SPRN_MAS0,r7
tlbre
mfspr r8,SPRN_MAS1
rlwinm r8,r8,0,2,0 /* clear IPROT */
mtspr SPRN_MAS1,r8
tlbwe
/* Invalidate TLB1 */
li r9,0x0c
tlbivax 0,r9
TLBSYNC
/* Establish the interrupt vector offsets */
SET_IVOR(0, CriticalInput);
SET_IVOR(1, MachineCheck);
SET_IVOR(2, DataStorage);
SET_IVOR(3, InstructionStorage);
SET_IVOR(4, ExternalInput);
SET_IVOR(5, Alignment);
SET_IVOR(6, Program);
SET_IVOR(7, FloatingPointUnavailable);
SET_IVOR(8, SystemCall);
SET_IVOR(9, AuxillaryProcessorUnavailable);
SET_IVOR(10, Decrementer);
SET_IVOR(11, FixedIntervalTimer);
SET_IVOR(12, WatchdogTimer);
SET_IVOR(13, DataTLBError);
SET_IVOR(14, InstructionTLBError);
SET_IVOR(15, DebugCrit);
/* Establish the interrupt vector base */
lis r4,interrupt_base@h /* IVPR only uses the high 16-bits */
mtspr SPRN_IVPR,r4
/* Setup the defaults for TLB entries */
li r2,(MAS4_TSIZED(BOOK3E_PAGESZ_4K))@l
#ifdef CONFIG_E200
oris r2,r2,MAS4_TLBSELD(1)@h
#endif
mtspr SPRN_MAS4, r2
#if 0
/* Enable DOZE */
mfspr r2,SPRN_HID0
oris r2,r2,HID0_DOZE@h
mtspr SPRN_HID0, r2
#endif
#if !defined(CONFIG_BDI_SWITCH)
/*
* The Abatron BDI JTAG debugger does not tolerate others
* mucking with the debug registers.
*/
lis r2,DBCR0_IDM@h
mtspr SPRN_DBCR0,r2
isync
/* clear any residual debug events */
li r2,-1
mtspr SPRN_DBSR,r2
#endif
#ifdef CONFIG_SMP
/* Check to see if we're the second processor, and jump
* to the secondary_start code if so
*/
mfspr r24,SPRN_PIR
cmpwi r24,0
bne __secondary_start
#endif
/*
* This is where the main kernel code starts.
*/
/* ptr to current */
lis r2,init_task@h
ori r2,r2,init_task@l
/* ptr to current thread */
addi r4,r2,THREAD /* init task's THREAD */
mtspr SPRN_SPRG_THREAD,r4
/* stack */
lis r1,init_thread_union@h
ori r1,r1,init_thread_union@l
li r0,0
stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1)
bl early_init
[POWERPC] 85xx: Add support for relocatable kernel (and booting at non-zero) Added support to allow an 85xx kernel to be run from a non-zero physical address (useful for cooperative asymmetric multiprocessing situations and kdump). The support can be configured at compile time by setting CONFIG_PAGE_OFFSET, CONFIG_KERNEL_START, and CONFIG_PHYSICAL_START as desired. Alternatively, the kernel build can set CONFIG_RELOCATABLE. Setting this config option causes the kernel to determine at runtime the physical addresses of CONFIG_PAGE_OFFSET and CONFIG_KERNEL_START. If CONFIG_RELOCATABLE is set, then CONFIG_PHYSICAL_START has no meaning. However, CONFIG_PHYSICAL_START will always be used to set the LOAD program header physical address field in the resulting ELF image. Currently we are limited to running at a physical address that is a multiple of 256M. This is due to how we map TLBs to cover lowmem. This should be fixed to allow 64M or maybe even 16M alignment in the future. It is considered an error to try and run a kernel at a non-aligned physical address. All the magic for this support is accomplished by proper initialization of the kernel memory subsystem and use of ARCH_PFN_OFFSET. The use of ARCH_PFN_OFFSET only affects normal memory and not IO mappings. ioremap uses map_page and isn't affected by ARCH_PFN_OFFSET. /dev/mem continues to allow access to any physical address in the system regardless of how CONFIG_PHYSICAL_START is set. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-04-21 18:22:34 +00:00
#ifdef CONFIG_RELOCATABLE
lis r3,kernstart_addr@ha
la r3,kernstart_addr@l(r3)
#ifdef CONFIG_PHYS_64BIT
stw r23,0(r3)
stw r25,4(r3)
#else
stw r25,0(r3)
#endif
#endif
/*
* Decide what sort of machine this is and initialize the MMU.
*/
mr r3,r31
mr r4,r30
mr r5,r29
mr r6,r28
mr r7,r27
bl machine_init
bl MMU_init
/* Setup PTE pointers for the Abatron bdiGDB */
lis r6, swapper_pg_dir@h
ori r6, r6, swapper_pg_dir@l
lis r5, abatron_pteptrs@h
ori r5, r5, abatron_pteptrs@l
lis r4, KERNELBASE@h
ori r4, r4, KERNELBASE@l
stw r5, 0(r4) /* Save abatron_pteptrs at a fixed location */
stw r6, 0(r5)
/* Let's move on */
lis r4,start_kernel@h
ori r4,r4,start_kernel@l
lis r3,MSR_KERNEL@h
ori r3,r3,MSR_KERNEL@l
mtspr SPRN_SRR0,r4
mtspr SPRN_SRR1,r3
rfi /* change context and jump to start_kernel */
/* Macros to hide the PTE size differences
*
* FIND_PTE -- walks the page tables given EA & pgdir pointer
* r10 -- EA of fault
* r11 -- PGDIR pointer
* r12 -- free
* label 2: is the bailout case
*
* if we find the pte (fall through):
* r11 is low pte word
* r12 is pointer to the pte
*/
#ifdef CONFIG_PTE_64BIT
#define FIND_PTE \
rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \
lwzx r11, r12, r11; /* Get pgd/pmd entry */ \
rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \
beq 2f; /* Bail if no table */ \
rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \
lwz r11, 4(r12); /* Get pte entry */
#else
#define FIND_PTE \
rlwimi r11, r10, 12, 20, 29; /* Create L1 (pgdir/pmd) address */ \
lwz r11, 0(r11); /* Get L1 entry */ \
rlwinm. r12, r11, 0, 0, 19; /* Extract L2 (pte) base address */ \
beq 2f; /* Bail if no table */ \
rlwimi r12, r10, 22, 20, 29; /* Compute PTE address */ \
lwz r11, 0(r12); /* Get Linux PTE */
#endif
/*
* Interrupt vector entry code
*
* The Book E MMUs are always on so we don't need to handle
* interrupts in real mode as with previous PPC processors. In
* this case we handle interrupts in the kernel virtual address
* space.
*
* Interrupt vectors are dynamically placed relative to the
* interrupt prefix as determined by the address of interrupt_base.
* The interrupt vectors offsets are programmed using the labels
* for each interrupt vector entry.
*
* Interrupt vectors must be aligned on a 16 byte boundary.
* We align on a 32 byte cache line boundary for good measure.
*/
interrupt_base:
/* Critical Input Interrupt */
CRITICAL_EXCEPTION(0x0100, CriticalInput, unknown_exception)
/* Machine Check Interrupt */
#ifdef CONFIG_E200
/* no RFMCI, MCSRRs on E200 */
CRITICAL_EXCEPTION(0x0200, MachineCheck, machine_check_exception)
#else
MCHECK_EXCEPTION(0x0200, MachineCheck, machine_check_exception)
#endif
/* Data Storage Interrupt */
START_EXCEPTION(DataStorage)
NORMAL_EXCEPTION_PROLOG
mfspr r5,SPRN_ESR /* Grab the ESR, save it, pass arg3 */
stw r5,_ESR(r11)
mfspr r4,SPRN_DEAR /* Grab the DEAR, save it, pass arg2 */
andis. r10,r5,(ESR_ILK|ESR_DLK)@h
bne 1f
EXC_XFER_EE_LITE(0x0300, handle_page_fault)
1:
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_EE_LITE(0x0300, CacheLockingException)
/* Instruction Storage Interrupt */
INSTRUCTION_STORAGE_EXCEPTION
/* External Input Interrupt */
EXCEPTION(0x0500, ExternalInput, do_IRQ, EXC_XFER_LITE)
/* Alignment Interrupt */
ALIGNMENT_EXCEPTION
/* Program Interrupt */
PROGRAM_EXCEPTION
/* Floating Point Unavailable Interrupt */
#ifdef CONFIG_PPC_FPU
FP_UNAVAILABLE_EXCEPTION
#else
#ifdef CONFIG_E200
/* E200 treats 'normal' floating point instructions as FP Unavail exception */
EXCEPTION(0x0800, FloatingPointUnavailable, program_check_exception, EXC_XFER_EE)
#else
EXCEPTION(0x0800, FloatingPointUnavailable, unknown_exception, EXC_XFER_EE)
#endif
#endif
/* System Call Interrupt */
START_EXCEPTION(SystemCall)
NORMAL_EXCEPTION_PROLOG
EXC_XFER_EE_LITE(0x0c00, DoSyscall)
/* Auxillary Processor Unavailable Interrupt */
EXCEPTION(0x2900, AuxillaryProcessorUnavailable, unknown_exception, EXC_XFER_EE)
/* Decrementer Interrupt */
DECREMENTER_EXCEPTION
/* Fixed Internal Timer Interrupt */
/* TODO: Add FIT support */
EXCEPTION(0x3100, FixedIntervalTimer, unknown_exception, EXC_XFER_EE)
/* Watchdog Timer Interrupt */
#ifdef CONFIG_BOOKE_WDT
CRITICAL_EXCEPTION(0x3200, WatchdogTimer, WatchdogException)
#else
CRITICAL_EXCEPTION(0x3200, WatchdogTimer, unknown_exception)
#endif
/* Data TLB Error Interrupt */
START_EXCEPTION(DataTLBError)
mtspr SPRN_SPRG_WSCRATCH0, r10 /* Save some working registers */
mtspr SPRN_SPRG_WSCRATCH1, r11
mtspr SPRN_SPRG_WSCRATCH2, r12
mtspr SPRN_SPRG_WSCRATCH3, r13
mfcr r11
mtspr SPRN_SPRG_WSCRATCH4, 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_SPRG_THREAD
lwz r11,PGDIR(r11)
4:
/* Mask of required permission bits. Note that while we
* do copy ESR:ST to _PAGE_RW position as trying to write
* to an RO page is pretty common, we don't do it with
* _PAGE_DIRTY. We could do it, but it's a fairly rare
* event so I'd rather take the overhead when it happens
* rather than adding an instruction here. We should measure
* whether the whole thing is worth it in the first place
* as we could avoid loading SPRN_ESR completely in the first
* place...
*
* TODO: Is it worth doing that mfspr & rlwimi in the first
* place or can we save a couple of instructions here ?
*/
mfspr r12,SPRN_ESR
#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 r10,r11,r12 /* create false data dep */
lwzx r13,r11,r10 /* Get upper pte bits */
#else
lwz r13,0(r12) /* Get upper pte bits */
#endif
#endif
bne 2f /* Bail if permission/valid mismach */
/* Jump to common tlb load */
b finish_tlb_load
2:
/* The bailout. Restore registers to pre-exception conditions
* and call the heavyweights to help us out.
*/
mfspr r11, SPRN_SPRG_RSCRATCH4
mtcr r11
mfspr r13, SPRN_SPRG_RSCRATCH3
mfspr r12, SPRN_SPRG_RSCRATCH2
mfspr r11, SPRN_SPRG_RSCRATCH1
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 */
mtspr SPRN_SPRG_WSCRATCH1, r11
mtspr SPRN_SPRG_WSCRATCH2, r12
mtspr SPRN_SPRG_WSCRATCH3, r13
mfcr r11
mtspr SPRN_SPRG_WSCRATCH4, 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_SPRG_THREAD
lwz r11,PGDIR(r11)
4:
/* Make up the required permissions */
#ifdef CONFIG_PTE_64BIT
li r13,_PAGE_PRESENT | _PAGE_EXEC
oris r13,r13,_PAGE_ACCESSED@h
#else
li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC
#endif
FIND_PTE
andc. r13,r13,r11 /* Check permission */
#ifdef CONFIG_PTE_64BIT
#ifdef CONFIG_SMP
subf r10,r11,r12 /* create false data dep */
lwzx r13,r11,r10 /* Get upper pte bits */
#else
lwz r13,0(r12) /* Get upper pte bits */
#endif
#endif
bne 2f /* Bail if permission mismach */
/* Jump to common TLB load point */
b finish_tlb_load
2:
/* The bailout. Restore registers to pre-exception conditions
* and call the heavyweights to help us out.
*/
mfspr r11, SPRN_SPRG_RSCRATCH4
mtcr r11
mfspr r13, SPRN_SPRG_RSCRATCH3
mfspr r12, SPRN_SPRG_RSCRATCH2
mfspr r11, SPRN_SPRG_RSCRATCH1
mfspr r10, SPRN_SPRG_RSCRATCH0
b InstructionStorage
#ifdef CONFIG_SPE
/* SPE Unavailable */
START_EXCEPTION(SPEUnavailable)
NORMAL_EXCEPTION_PROLOG
bne load_up_spe
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_EE_LITE(0x2010, KernelSPE)
#else
EXCEPTION(0x2020, SPEUnavailable, unknown_exception, EXC_XFER_EE)
#endif /* CONFIG_SPE */
/* SPE Floating Point Data */
#ifdef CONFIG_SPE
EXCEPTION(0x2030, SPEFloatingPointData, SPEFloatingPointException, EXC_XFER_EE);
/* SPE Floating Point Round */
EXCEPTION(0x2050, SPEFloatingPointRound, SPEFloatingPointRoundException, EXC_XFER_EE)
#else
EXCEPTION(0x2040, SPEFloatingPointData, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x2050, SPEFloatingPointRound, unknown_exception, EXC_XFER_EE)
#endif /* CONFIG_SPE */
/* Performance Monitor */
EXCEPTION(0x2060, PerformanceMonitor, performance_monitor_exception, EXC_XFER_STD)
EXCEPTION(0x2070, Doorbell, doorbell_exception, EXC_XFER_STD)
CRITICAL_EXCEPTION(0x2080, CriticalDoorbell, unknown_exception)
/* Debug Interrupt */
DEBUG_DEBUG_EXCEPTION
DEBUG_CRIT_EXCEPTION
/*
* Local functions
*/
/*
* Both the instruction and data TLB miss get to this
* point to load the TLB.
* r10 - available to use
* r11 - TLB (info from Linux PTE)
* r12 - available to use
* r13 - upper bits of PTE (if PTE_64BIT) or available to use
* CR5 - results of addr >= PAGE_OFFSET
* MAS0, MAS1 - loaded with proper value when we get here
* MAS2, MAS3 - will need additional info from Linux PTE
* Upon exit, we reload everything and RFI.
*/
finish_tlb_load:
/*
* We set execute, because we don't have the granularity to
* properly set this at the page level (Linux problem).
* Many of these bits are software only. Bits we don't set
* here we (properly should) assume have the appropriate value.
*/
mfspr r12, SPRN_MAS2
#ifdef CONFIG_PTE_64BIT
rlwimi r12, r11, 32-19, 27, 31 /* extract WIMGE from pte */
#else
rlwimi r12, r11, 26, 27, 31 /* extract WIMGE from pte */
#endif
mtspr SPRN_MAS2, r12
#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] */
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)
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 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_SPRG_RSCRATCH4
mtcr r11
mfspr r13, SPRN_SPRG_RSCRATCH3
mfspr r12, SPRN_SPRG_RSCRATCH2
mfspr r11, SPRN_SPRG_RSCRATCH1
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! */
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_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)
#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 */
#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 */
/*
* Global functions
*/
/* 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
/* 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
/* 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
/*
* extern void giveup_altivec(struct task_struct *prev)
*
* The e500 core does not have an AltiVec unit.
*/
_GLOBAL(giveup_altivec)
blr
#ifdef CONFIG_SPE
/*
* extern void giveup_spe(struct task_struct *prev)
*
*/
_GLOBAL(giveup_spe)
mfmsr r5
oris r5,r5,MSR_SPE@h
mtmsr r5 /* enable use of SPE now */
isync
cmpi 0,r3,0
beqlr- /* if no previous owner, done */
addi r3,r3,THREAD /* want THREAD of task */
lwz r5,PT_REGS(r3)
cmpi 0,r5,0
SAVE_32EVRS(0, r4, r3)
evxor evr6, evr6, evr6 /* clear out evr6 */
evmwumiaa evr6, evr6, evr6 /* evr6 <- ACC = 0 * 0 + ACC */
li r4,THREAD_ACC
evstddx evr6, r4, r3 /* save off accumulator */
mfspr r6,SPRN_SPEFSCR
stw r6,THREAD_SPEFSCR(r3) /* save spefscr register value */
beq 1f
lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5)
lis r3,MSR_SPE@h
andc r4,r4,r3 /* disable SPE for previous task */
stw r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1:
#ifndef CONFIG_SMP
li r5,0
lis r4,last_task_used_spe@ha
stw r5,last_task_used_spe@l(r4)
#endif /* !CONFIG_SMP */
blr
#endif /* CONFIG_SPE */
/*
* extern void giveup_fpu(struct task_struct *prev)
*
* Not all FSL Book-E cores have an FPU
*/
#ifndef CONFIG_PPC_FPU
_GLOBAL(giveup_fpu)
blr
#endif
/*
* extern void abort(void)
*
* At present, this routine just applies a system reset.
*/
_GLOBAL(abort)
li r13,0
mtspr SPRN_DBCR0,r13 /* disable all debug events */
isync
mfmsr r13
ori r13,r13,MSR_DE@l /* Enable Debug Events */
mtmsr r13
isync
mfspr r13,SPRN_DBCR0
lis r13,(DBCR0_IDM|DBCR0_RST_CHIP)@h
mtspr SPRN_DBCR0,r13
isync
_GLOBAL(set_context)
#ifdef CONFIG_BDI_SWITCH
/* Context switch the PTE pointer for the Abatron BDI2000.
* The PGDIR is the second parameter.
*/
lis r5, abatron_pteptrs@h
ori r5, r5, abatron_pteptrs@l
stw r4, 0x4(r5)
#endif
mtspr SPRN_PID,r3
isync /* Force context change */
blr
_GLOBAL(flush_dcache_L1)
mfspr r3,SPRN_L1CFG0
rlwinm r5,r3,9,3 /* Extract cache block size */
twlgti r5,1 /* Only 32 and 64 byte cache blocks
* are currently defined.
*/
li r4,32
subfic r6,r5,2 /* r6 = log2(1KiB / cache block size) -
* log2(number of ways)
*/
slw r5,r4,r5 /* r5 = cache block size */
rlwinm r7,r3,0,0xff /* Extract number of KiB in the cache */
mulli r7,r7,13 /* An 8-way cache will require 13
* loads per set.
*/
slw r7,r7,r6
/* save off HID0 and set DCFA */
mfspr r8,SPRN_HID0
ori r9,r8,HID0_DCFA@l
mtspr SPRN_HID0,r9
isync
lis r4,KERNELBASE@h
mtctr r7
1: lwz r3,0(r4) /* Load... */
add r4,r4,r5
bdnz 1b
msync
lis r4,KERNELBASE@h
mtctr r7
1: dcbf 0,r4 /* ...and flush. */
add r4,r4,r5
bdnz 1b
/* restore HID0 */
mtspr SPRN_HID0,r8
isync
blr
#ifdef CONFIG_SMP
/* When we get here, r24 needs to hold the CPU # */
.globl __secondary_start
__secondary_start:
lis r3,__secondary_hold_acknowledge@h
ori r3,r3,__secondary_hold_acknowledge@l
stw r24,0(r3)
li r3,0
mr r4,r24 /* Why? */
bl call_setup_cpu
lis r3,tlbcam_index@ha
lwz r3,tlbcam_index@l(r3)
mtctr r3
li r26,0 /* r26 safe? */
/* Load each CAM entry */
1: mr r3,r26
bl loadcam_entry
addi r26,r26,1
bdnz 1b
/* get current_thread_info and current */
lis r1,secondary_ti@ha
lwz r1,secondary_ti@l(r1)
lwz r2,TI_TASK(r1)
/* stack */
addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
li r0,0
stw r0,0(r1)
/* ptr to current thread */
addi r4,r2,THREAD /* address of our thread_struct */
mtspr SPRN_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
/*
* We put a few things here that have to be page-aligned. This stuff
* goes at the beginning of the data segment, which is page-aligned.
*/
.data
.align 12
.globl sdata
sdata:
.globl empty_zero_page
empty_zero_page:
.space 4096
.globl swapper_pg_dir
swapper_pg_dir:
.space PGD_TABLE_SIZE
/*
* Room for two PTE pointers, usually the kernel and current user pointers
* to their respective root page table.
*/
abatron_pteptrs:
.space 8