mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 16:54:20 +08:00
6323875db2
Directives such as .long and .word do not magically cause the
assembler location counter to become aligned in gas. As a result,
using these directives in code sections can result in misaligned
data words when building a Thumb-2 kernel (CONFIG_THUMB2_KERNEL).
This is a Bad Thing, since the ABI permits the compiler to assume
that fundamental types of word size or above are word- aligned when
accessing them from C. If the data is not really word-aligned,
this can cause impaired performance and stray alignment faults in
some circumstances.
In general, the following rules should be applied when using data
word declaration directives inside code sections:
* .quad and .double:
.align 3
* .long, .word, .single, .float:
.align (or .align 2)
* .short:
No explicit alignment required, since Thumb-2
instructions are always 2 or 4 bytes in size.
immediately after an instruction.
In this specific case, we can achieve the desired alignment by
forcing a 32-bit branch instruction using the W() macro, since the
assembler location counter is already 32-bit aligned in this case.
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Dave Martin <dave.martin@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
426 lines
11 KiB
ArmAsm
426 lines
11 KiB
ArmAsm
/*
|
|
* linux/arch/arm/mm/proc-v7.S
|
|
*
|
|
* Copyright (C) 2001 Deep Blue Solutions Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This is the "shell" of the ARMv7 processor support.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/hwcap.h>
|
|
#include <asm/pgtable-hwdef.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
#include "proc-macros.S"
|
|
|
|
#define TTB_S (1 << 1)
|
|
#define TTB_RGN_NC (0 << 3)
|
|
#define TTB_RGN_OC_WBWA (1 << 3)
|
|
#define TTB_RGN_OC_WT (2 << 3)
|
|
#define TTB_RGN_OC_WB (3 << 3)
|
|
#define TTB_NOS (1 << 5)
|
|
#define TTB_IRGN_NC ((0 << 0) | (0 << 6))
|
|
#define TTB_IRGN_WBWA ((0 << 0) | (1 << 6))
|
|
#define TTB_IRGN_WT ((1 << 0) | (0 << 6))
|
|
#define TTB_IRGN_WB ((1 << 0) | (1 << 6))
|
|
|
|
/* PTWs cacheable, inner WB not shareable, outer WB not shareable */
|
|
#define TTB_FLAGS_UP TTB_IRGN_WB|TTB_RGN_OC_WB
|
|
#define PMD_FLAGS_UP PMD_SECT_WB
|
|
|
|
/* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */
|
|
#define TTB_FLAGS_SMP TTB_IRGN_WBWA|TTB_S|TTB_NOS|TTB_RGN_OC_WBWA
|
|
#define PMD_FLAGS_SMP PMD_SECT_WBWA|PMD_SECT_S
|
|
|
|
ENTRY(cpu_v7_proc_init)
|
|
mov pc, lr
|
|
ENDPROC(cpu_v7_proc_init)
|
|
|
|
ENTRY(cpu_v7_proc_fin)
|
|
mrc p15, 0, r0, c1, c0, 0 @ ctrl register
|
|
bic r0, r0, #0x1000 @ ...i............
|
|
bic r0, r0, #0x0006 @ .............ca.
|
|
mcr p15, 0, r0, c1, c0, 0 @ disable caches
|
|
mov pc, lr
|
|
ENDPROC(cpu_v7_proc_fin)
|
|
|
|
/*
|
|
* cpu_v7_reset(loc)
|
|
*
|
|
* Perform a soft reset of the system. Put the CPU into the
|
|
* same state as it would be if it had been reset, and branch
|
|
* to what would be the reset vector.
|
|
*
|
|
* - loc - location to jump to for soft reset
|
|
*/
|
|
.align 5
|
|
ENTRY(cpu_v7_reset)
|
|
mov pc, r0
|
|
ENDPROC(cpu_v7_reset)
|
|
|
|
/*
|
|
* cpu_v7_do_idle()
|
|
*
|
|
* Idle the processor (eg, wait for interrupt).
|
|
*
|
|
* IRQs are already disabled.
|
|
*/
|
|
ENTRY(cpu_v7_do_idle)
|
|
dsb @ WFI may enter a low-power mode
|
|
wfi
|
|
mov pc, lr
|
|
ENDPROC(cpu_v7_do_idle)
|
|
|
|
ENTRY(cpu_v7_dcache_clean_area)
|
|
#ifndef TLB_CAN_READ_FROM_L1_CACHE
|
|
dcache_line_size r2, r3
|
|
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
add r0, r0, r2
|
|
subs r1, r1, r2
|
|
bhi 1b
|
|
dsb
|
|
#endif
|
|
mov pc, lr
|
|
ENDPROC(cpu_v7_dcache_clean_area)
|
|
|
|
/*
|
|
* cpu_v7_switch_mm(pgd_phys, tsk)
|
|
*
|
|
* Set the translation table base pointer to be pgd_phys
|
|
*
|
|
* - pgd_phys - physical address of new TTB
|
|
*
|
|
* It is assumed that:
|
|
* - we are not using split page tables
|
|
*/
|
|
ENTRY(cpu_v7_switch_mm)
|
|
#ifdef CONFIG_MMU
|
|
mov r2, #0
|
|
ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id
|
|
ALT_SMP(orr r0, r0, #TTB_FLAGS_SMP)
|
|
ALT_UP(orr r0, r0, #TTB_FLAGS_UP)
|
|
#ifdef CONFIG_ARM_ERRATA_430973
|
|
mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB
|
|
#endif
|
|
mcr p15, 0, r2, c13, c0, 1 @ set reserved context ID
|
|
isb
|
|
1: mcr p15, 0, r0, c2, c0, 0 @ set TTB 0
|
|
isb
|
|
mcr p15, 0, r1, c13, c0, 1 @ set context ID
|
|
isb
|
|
#endif
|
|
mov pc, lr
|
|
ENDPROC(cpu_v7_switch_mm)
|
|
|
|
/*
|
|
* cpu_v7_set_pte_ext(ptep, pte)
|
|
*
|
|
* Set a level 2 translation table entry.
|
|
*
|
|
* - ptep - pointer to level 2 translation table entry
|
|
* (hardware version is stored at -1024 bytes)
|
|
* - pte - PTE value to store
|
|
* - ext - value for extended PTE bits
|
|
*/
|
|
ENTRY(cpu_v7_set_pte_ext)
|
|
#ifdef CONFIG_MMU
|
|
ARM( str r1, [r0], #-2048 ) @ linux version
|
|
THUMB( str r1, [r0] ) @ linux version
|
|
THUMB( sub r0, r0, #2048 )
|
|
|
|
bic r3, r1, #0x000003f0
|
|
bic r3, r3, #PTE_TYPE_MASK
|
|
orr r3, r3, r2
|
|
orr r3, r3, #PTE_EXT_AP0 | 2
|
|
|
|
tst r1, #1 << 4
|
|
orrne r3, r3, #PTE_EXT_TEX(1)
|
|
|
|
tst r1, #L_PTE_WRITE
|
|
tstne r1, #L_PTE_DIRTY
|
|
orreq r3, r3, #PTE_EXT_APX
|
|
|
|
tst r1, #L_PTE_USER
|
|
orrne r3, r3, #PTE_EXT_AP1
|
|
tstne r3, #PTE_EXT_APX
|
|
bicne r3, r3, #PTE_EXT_APX | PTE_EXT_AP0
|
|
|
|
tst r1, #L_PTE_EXEC
|
|
orreq r3, r3, #PTE_EXT_XN
|
|
|
|
tst r1, #L_PTE_YOUNG
|
|
tstne r1, #L_PTE_PRESENT
|
|
moveq r3, #0
|
|
|
|
str r3, [r0]
|
|
mcr p15, 0, r0, c7, c10, 1 @ flush_pte
|
|
#endif
|
|
mov pc, lr
|
|
ENDPROC(cpu_v7_set_pte_ext)
|
|
|
|
cpu_v7_name:
|
|
.ascii "ARMv7 Processor"
|
|
.align
|
|
|
|
__CPUINIT
|
|
|
|
/*
|
|
* __v7_setup
|
|
*
|
|
* Initialise TLB, Caches, and MMU state ready to switch the MMU
|
|
* on. Return in r0 the new CP15 C1 control register setting.
|
|
*
|
|
* We automatically detect if we have a Harvard cache, and use the
|
|
* Harvard cache control instructions insead of the unified cache
|
|
* control instructions.
|
|
*
|
|
* This should be able to cover all ARMv7 cores.
|
|
*
|
|
* It is assumed that:
|
|
* - cache type register is implemented
|
|
*/
|
|
__v7_ca9mp_setup:
|
|
#ifdef CONFIG_SMP
|
|
ALT_SMP(mrc p15, 0, r0, c1, c0, 1)
|
|
ALT_UP(mov r0, #(1 << 6)) @ fake it for UP
|
|
tst r0, #(1 << 6) @ SMP/nAMP mode enabled?
|
|
orreq r0, r0, #(1 << 6) | (1 << 0) @ Enable SMP/nAMP mode and
|
|
mcreq p15, 0, r0, c1, c0, 1 @ TLB ops broadcasting
|
|
#endif
|
|
__v7_setup:
|
|
adr r12, __v7_setup_stack @ the local stack
|
|
stmia r12, {r0-r5, r7, r9, r11, lr}
|
|
bl v7_flush_dcache_all
|
|
ldmia r12, {r0-r5, r7, r9, r11, lr}
|
|
|
|
mrc p15, 0, r0, c0, c0, 0 @ read main ID register
|
|
and r10, r0, #0xff000000 @ ARM?
|
|
teq r10, #0x41000000
|
|
bne 3f
|
|
and r5, r0, #0x00f00000 @ variant
|
|
and r6, r0, #0x0000000f @ revision
|
|
orr r6, r6, r5, lsr #20-4 @ combine variant and revision
|
|
ubfx r0, r0, #4, #12 @ primary part number
|
|
|
|
/* Cortex-A8 Errata */
|
|
ldr r10, =0x00000c08 @ Cortex-A8 primary part number
|
|
teq r0, r10
|
|
bne 2f
|
|
#ifdef CONFIG_ARM_ERRATA_430973
|
|
teq r5, #0x00100000 @ only present in r1p*
|
|
mrceq p15, 0, r10, c1, c0, 1 @ read aux control register
|
|
orreq r10, r10, #(1 << 6) @ set IBE to 1
|
|
mcreq p15, 0, r10, c1, c0, 1 @ write aux control register
|
|
#endif
|
|
#ifdef CONFIG_ARM_ERRATA_458693
|
|
teq r6, #0x20 @ only present in r2p0
|
|
mrceq p15, 0, r10, c1, c0, 1 @ read aux control register
|
|
orreq r10, r10, #(1 << 5) @ set L1NEON to 1
|
|
orreq r10, r10, #(1 << 9) @ set PLDNOP to 1
|
|
mcreq p15, 0, r10, c1, c0, 1 @ write aux control register
|
|
#endif
|
|
#ifdef CONFIG_ARM_ERRATA_460075
|
|
teq r6, #0x20 @ only present in r2p0
|
|
mrceq p15, 1, r10, c9, c0, 2 @ read L2 cache aux ctrl register
|
|
tsteq r10, #1 << 22
|
|
orreq r10, r10, #(1 << 22) @ set the Write Allocate disable bit
|
|
mcreq p15, 1, r10, c9, c0, 2 @ write the L2 cache aux ctrl register
|
|
#endif
|
|
b 3f
|
|
|
|
/* Cortex-A9 Errata */
|
|
2: ldr r10, =0x00000c09 @ Cortex-A9 primary part number
|
|
teq r0, r10
|
|
bne 3f
|
|
#ifdef CONFIG_ARM_ERRATA_742230
|
|
cmp r6, #0x22 @ only present up to r2p2
|
|
mrcle p15, 0, r10, c15, c0, 1 @ read diagnostic register
|
|
orrle r10, r10, #1 << 4 @ set bit #4
|
|
mcrle p15, 0, r10, c15, c0, 1 @ write diagnostic register
|
|
#endif
|
|
#ifdef CONFIG_ARM_ERRATA_742231
|
|
teq r6, #0x20 @ present in r2p0
|
|
teqne r6, #0x21 @ present in r2p1
|
|
teqne r6, #0x22 @ present in r2p2
|
|
mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register
|
|
orreq r10, r10, #1 << 12 @ set bit #12
|
|
orreq r10, r10, #1 << 22 @ set bit #22
|
|
mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
|
|
#endif
|
|
#ifdef CONFIG_ARM_ERRATA_743622
|
|
teq r6, #0x20 @ present in r2p0
|
|
teqne r6, #0x21 @ present in r2p1
|
|
teqne r6, #0x22 @ present in r2p2
|
|
mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register
|
|
orreq r10, r10, #1 << 6 @ set bit #6
|
|
mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
|
|
#endif
|
|
|
|
3: mov r10, #0
|
|
#ifdef HARVARD_CACHE
|
|
mcr p15, 0, r10, c7, c5, 0 @ I+BTB cache invalidate
|
|
#endif
|
|
dsb
|
|
#ifdef CONFIG_MMU
|
|
mcr p15, 0, r10, c8, c7, 0 @ invalidate I + D TLBs
|
|
mcr p15, 0, r10, c2, c0, 2 @ TTB control register
|
|
ALT_SMP(orr r4, r4, #TTB_FLAGS_SMP)
|
|
ALT_UP(orr r4, r4, #TTB_FLAGS_UP)
|
|
mcr p15, 0, r4, c2, c0, 1 @ load TTB1
|
|
mov r10, #0x1f @ domains 0, 1 = manager
|
|
mcr p15, 0, r10, c3, c0, 0 @ load domain access register
|
|
/*
|
|
* Memory region attributes with SCTLR.TRE=1
|
|
*
|
|
* n = TEX[0],C,B
|
|
* TR = PRRR[2n+1:2n] - memory type
|
|
* IR = NMRR[2n+1:2n] - inner cacheable property
|
|
* OR = NMRR[2n+17:2n+16] - outer cacheable property
|
|
*
|
|
* n TR IR OR
|
|
* UNCACHED 000 00
|
|
* BUFFERABLE 001 10 00 00
|
|
* WRITETHROUGH 010 10 10 10
|
|
* WRITEBACK 011 10 11 11
|
|
* reserved 110
|
|
* WRITEALLOC 111 10 01 01
|
|
* DEV_SHARED 100 01
|
|
* DEV_NONSHARED 100 01
|
|
* DEV_WC 001 10
|
|
* DEV_CACHED 011 10
|
|
*
|
|
* Other attributes:
|
|
*
|
|
* DS0 = PRRR[16] = 0 - device shareable property
|
|
* DS1 = PRRR[17] = 1 - device shareable property
|
|
* NS0 = PRRR[18] = 0 - normal shareable property
|
|
* NS1 = PRRR[19] = 1 - normal shareable property
|
|
* NOS = PRRR[24+n] = 1 - not outer shareable
|
|
*/
|
|
ldr r5, =0xff0a81a8 @ PRRR
|
|
ldr r6, =0x40e040e0 @ NMRR
|
|
mcr p15, 0, r5, c10, c2, 0 @ write PRRR
|
|
mcr p15, 0, r6, c10, c2, 1 @ write NMRR
|
|
#endif
|
|
adr r5, v7_crval
|
|
ldmia r5, {r5, r6}
|
|
#ifdef CONFIG_CPU_ENDIAN_BE8
|
|
orr r6, r6, #1 << 25 @ big-endian page tables
|
|
#endif
|
|
mrc p15, 0, r0, c1, c0, 0 @ read control register
|
|
bic r0, r0, r5 @ clear bits them
|
|
orr r0, r0, r6 @ set them
|
|
THUMB( orr r0, r0, #1 << 30 ) @ Thumb exceptions
|
|
mov pc, lr @ return to head.S:__ret
|
|
ENDPROC(__v7_setup)
|
|
|
|
/* AT
|
|
* TFR EV X F I D LR S
|
|
* .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM
|
|
* rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
|
|
* 1 0 110 0011 1100 .111 1101 < we want
|
|
*/
|
|
.type v7_crval, #object
|
|
v7_crval:
|
|
crval clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c
|
|
|
|
__v7_setup_stack:
|
|
.space 4 * 11 @ 11 registers
|
|
|
|
__INITDATA
|
|
|
|
.type v7_processor_functions, #object
|
|
ENTRY(v7_processor_functions)
|
|
.word v7_early_abort
|
|
.word v7_pabort
|
|
.word cpu_v7_proc_init
|
|
.word cpu_v7_proc_fin
|
|
.word cpu_v7_reset
|
|
.word cpu_v7_do_idle
|
|
.word cpu_v7_dcache_clean_area
|
|
.word cpu_v7_switch_mm
|
|
.word cpu_v7_set_pte_ext
|
|
.size v7_processor_functions, . - v7_processor_functions
|
|
|
|
.section ".rodata"
|
|
|
|
.type cpu_arch_name, #object
|
|
cpu_arch_name:
|
|
.asciz "armv7"
|
|
.size cpu_arch_name, . - cpu_arch_name
|
|
|
|
.type cpu_elf_name, #object
|
|
cpu_elf_name:
|
|
.asciz "v7"
|
|
.size cpu_elf_name, . - cpu_elf_name
|
|
.align
|
|
|
|
.section ".proc.info.init", #alloc, #execinstr
|
|
|
|
.type __v7_ca9mp_proc_info, #object
|
|
__v7_ca9mp_proc_info:
|
|
.long 0x410fc090 @ Required ID value
|
|
.long 0xff0ffff0 @ Mask for ID
|
|
ALT_SMP(.long \
|
|
PMD_TYPE_SECT | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ | \
|
|
PMD_FLAGS_SMP)
|
|
ALT_UP(.long \
|
|
PMD_TYPE_SECT | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ | \
|
|
PMD_FLAGS_UP)
|
|
.long PMD_TYPE_SECT | \
|
|
PMD_SECT_XN | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ
|
|
W(b) __v7_ca9mp_setup
|
|
.long cpu_arch_name
|
|
.long cpu_elf_name
|
|
.long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_TLS
|
|
.long cpu_v7_name
|
|
.long v7_processor_functions
|
|
.long v7wbi_tlb_fns
|
|
.long v6_user_fns
|
|
.long v7_cache_fns
|
|
.size __v7_ca9mp_proc_info, . - __v7_ca9mp_proc_info
|
|
|
|
/*
|
|
* Match any ARMv7 processor core.
|
|
*/
|
|
.type __v7_proc_info, #object
|
|
__v7_proc_info:
|
|
.long 0x000f0000 @ Required ID value
|
|
.long 0x000f0000 @ Mask for ID
|
|
ALT_SMP(.long \
|
|
PMD_TYPE_SECT | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ | \
|
|
PMD_FLAGS_SMP)
|
|
ALT_UP(.long \
|
|
PMD_TYPE_SECT | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ | \
|
|
PMD_FLAGS_UP)
|
|
.long PMD_TYPE_SECT | \
|
|
PMD_SECT_XN | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ
|
|
W(b) __v7_setup
|
|
.long cpu_arch_name
|
|
.long cpu_elf_name
|
|
.long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_TLS
|
|
.long cpu_v7_name
|
|
.long v7_processor_functions
|
|
.long v7wbi_tlb_fns
|
|
.long v6_user_fns
|
|
.long v7_cache_fns
|
|
.size __v7_proc_info, . - __v7_proc_info
|