271 lines
6.3 KiB
ArmAsm
271 lines
6.3 KiB
ArmAsm
/*
|
|
* linux/arch/arm/mm/proc-v6.S
|
|
*
|
|
* Copyright (C) 2001 Deep Blue Solutions Ltd.
|
|
* Modified by Catalin Marinas for noMMU support
|
|
*
|
|
* 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 ARMv6 processor support.
|
|
*/
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/elf.h>
|
|
#include <asm/pgtable-hwdef.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
#include "proc-macros.S"
|
|
|
|
#define D_CACHE_LINE_SIZE 32
|
|
|
|
#define TTB_C (1 << 0)
|
|
#define TTB_S (1 << 1)
|
|
#define TTB_IMP (1 << 2)
|
|
#define TTB_RGN_NC (0 << 3)
|
|
#define TTB_RGN_WBWA (1 << 3)
|
|
#define TTB_RGN_WT (2 << 3)
|
|
#define TTB_RGN_WB (3 << 3)
|
|
|
|
#ifndef CONFIG_SMP
|
|
#define TTB_FLAGS TTB_RGN_WBWA
|
|
#else
|
|
#define TTB_FLAGS TTB_RGN_WBWA|TTB_S
|
|
#endif
|
|
|
|
ENTRY(cpu_v6_proc_init)
|
|
mov pc, lr
|
|
|
|
ENTRY(cpu_v6_proc_fin)
|
|
stmfd sp!, {lr}
|
|
cpsid if @ disable interrupts
|
|
bl v6_flush_kern_cache_all
|
|
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
|
|
ldmfd sp!, {pc}
|
|
|
|
/*
|
|
* cpu_v6_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
|
|
*
|
|
* It is assumed that:
|
|
*/
|
|
.align 5
|
|
ENTRY(cpu_v6_reset)
|
|
mov pc, r0
|
|
|
|
/*
|
|
* cpu_v6_do_idle()
|
|
*
|
|
* Idle the processor (eg, wait for interrupt).
|
|
*
|
|
* IRQs are already disabled.
|
|
*/
|
|
ENTRY(cpu_v6_do_idle)
|
|
mcr p15, 0, r1, c7, c0, 4 @ wait for interrupt
|
|
mov pc, lr
|
|
|
|
ENTRY(cpu_v6_dcache_clean_area)
|
|
#ifndef TLB_CAN_READ_FROM_L1_CACHE
|
|
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
add r0, r0, #D_CACHE_LINE_SIZE
|
|
subs r1, r1, #D_CACHE_LINE_SIZE
|
|
bhi 1b
|
|
#endif
|
|
mov pc, lr
|
|
|
|
/*
|
|
* cpu_arm926_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_v6_switch_mm)
|
|
#ifdef CONFIG_MMU
|
|
mov r2, #0
|
|
ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id
|
|
orr r0, r0, #TTB_FLAGS
|
|
mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB
|
|
mcr p15, 0, r2, c7, c10, 4 @ drain write buffer
|
|
mcr p15, 0, r0, c2, c0, 0 @ set TTB 0
|
|
mcr p15, 0, r1, c13, c0, 1 @ set context ID
|
|
#endif
|
|
mov pc, lr
|
|
|
|
/*
|
|
* cpu_v6_set_pte_ext(ptep, pte, ext)
|
|
*
|
|
* 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
|
|
*
|
|
* Permissions:
|
|
* YUWD APX AP1 AP0 SVC User
|
|
* 0xxx 0 0 0 no acc no acc
|
|
* 100x 1 0 1 r/o no acc
|
|
* 10x0 1 0 1 r/o no acc
|
|
* 1011 0 0 1 r/w no acc
|
|
* 110x 0 1 0 r/w r/o
|
|
* 11x0 0 1 0 r/w r/o
|
|
* 1111 0 1 1 r/w r/w
|
|
*/
|
|
ENTRY(cpu_v6_set_pte_ext)
|
|
#ifdef CONFIG_MMU
|
|
str r1, [r0], #-2048 @ linux version
|
|
|
|
bic r3, r1, #0x000003f0
|
|
bic r3, r3, #0x00000003
|
|
orr r3, r3, r2
|
|
orr r3, r3, #PTE_EXT_AP0 | 2
|
|
|
|
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_YOUNG
|
|
biceq r3, r3, #PTE_EXT_APX | PTE_EXT_AP_MASK
|
|
|
|
tst r1, #L_PTE_EXEC
|
|
orreq r3, r3, #PTE_EXT_XN
|
|
|
|
tst r1, #L_PTE_PRESENT
|
|
moveq r3, #0
|
|
|
|
str r3, [r0]
|
|
mcr p15, 0, r0, c7, c10, 1 @ flush_pte
|
|
#endif
|
|
mov pc, lr
|
|
|
|
|
|
|
|
|
|
cpu_v6_name:
|
|
.asciz "ARMv6-compatible processor"
|
|
.align
|
|
|
|
.section ".text.init", #alloc, #execinstr
|
|
|
|
/*
|
|
* __v6_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 ARMv6 cores.
|
|
*
|
|
* It is assumed that:
|
|
* - cache type register is implemented
|
|
*/
|
|
__v6_setup:
|
|
#ifdef CONFIG_SMP
|
|
mrc p15, 0, r0, c1, c0, 1 @ Enable SMP/nAMP mode
|
|
orr r0, r0, #0x20
|
|
mcr p15, 0, r0, c1, c0, 1
|
|
#endif
|
|
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c14, 0 @ clean+invalidate D cache
|
|
mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
|
|
mcr p15, 0, r0, c7, c15, 0 @ clean+invalidate cache
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
|
|
#ifdef CONFIG_MMU
|
|
mcr p15, 0, r0, c8, c7, 0 @ invalidate I + D TLBs
|
|
mcr p15, 0, r0, c2, c0, 2 @ TTB control register
|
|
orr r4, r4, #TTB_FLAGS
|
|
mcr p15, 0, r4, c2, c0, 1 @ load TTB1
|
|
#endif /* CONFIG_MMU */
|
|
adr r5, v6_crval
|
|
ldmia r5, {r5, r6}
|
|
mrc p15, 0, r0, c1, c0, 0 @ read control register
|
|
bic r0, r0, r5 @ clear bits them
|
|
orr r0, r0, r6 @ set them
|
|
mov pc, lr @ return to head.S:__ret
|
|
|
|
/*
|
|
* V X F I D LR
|
|
* .... ...E PUI. .T.T 4RVI ZFRS BLDP WCAM
|
|
* rrrr rrrx xxx0 0101 xxxx xxxx x111 xxxx < forced
|
|
* 0 110 0011 1.00 .111 1101 < we want
|
|
*/
|
|
.type v6_crval, #object
|
|
v6_crval:
|
|
crval clear=0x01e0fb7f, mmuset=0x00c0387d, ucset=0x00c0187c
|
|
|
|
.type v6_processor_functions, #object
|
|
ENTRY(v6_processor_functions)
|
|
.word v6_early_abort
|
|
.word pabort_noifar
|
|
.word cpu_v6_proc_init
|
|
.word cpu_v6_proc_fin
|
|
.word cpu_v6_reset
|
|
.word cpu_v6_do_idle
|
|
.word cpu_v6_dcache_clean_area
|
|
.word cpu_v6_switch_mm
|
|
.word cpu_v6_set_pte_ext
|
|
.size v6_processor_functions, . - v6_processor_functions
|
|
|
|
.type cpu_arch_name, #object
|
|
cpu_arch_name:
|
|
.asciz "armv6"
|
|
.size cpu_arch_name, . - cpu_arch_name
|
|
|
|
.type cpu_elf_name, #object
|
|
cpu_elf_name:
|
|
.asciz "v6"
|
|
.size cpu_elf_name, . - cpu_elf_name
|
|
.align
|
|
|
|
.section ".proc.info.init", #alloc, #execinstr
|
|
|
|
/*
|
|
* Match any ARMv6 processor core.
|
|
*/
|
|
.type __v6_proc_info, #object
|
|
__v6_proc_info:
|
|
.long 0x0007b000
|
|
.long 0x0007f000
|
|
.long PMD_TYPE_SECT | \
|
|
PMD_SECT_BUFFERABLE | \
|
|
PMD_SECT_CACHEABLE | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ
|
|
.long PMD_TYPE_SECT | \
|
|
PMD_SECT_XN | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ
|
|
b __v6_setup
|
|
.long cpu_arch_name
|
|
.long cpu_elf_name
|
|
.long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA
|
|
.long cpu_v6_name
|
|
.long v6_processor_functions
|
|
.long v6wbi_tlb_fns
|
|
.long v6_user_fns
|
|
.long v6_cache_fns
|
|
.size __v6_proc_info, . - __v6_proc_info
|