467 lines
11 KiB
ArmAsm
467 lines
11 KiB
ArmAsm
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
||
|
|
/*
|
||
|
|
* linux/arch/arm/mm/proc-arm920.S: MMU functions for ARM920
|
||
|
|
*
|
||
|
|
* Copyright (C) 1999,2000 ARM Limited
|
||
|
|
* Copyright (C) 2000 Deep Blue Solutions Ltd.
|
||
|
|
* hacked for non-paged-MM by Hyok S. Choi, 2003.
|
||
|
|
*
|
||
|
|
* These are the low level assembler for performing cache and TLB
|
||
|
|
* functions on the arm920.
|
||
|
|
*
|
||
|
|
* CONFIG_CPU_ARM920_CPU_IDLE -> nohlt
|
||
|
|
*/
|
||
|
|
#include <linux/linkage.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <asm/assembler.h>
|
||
|
|
#include <asm/hwcap.h>
|
||
|
|
#include <asm/pgtable-hwdef.h>
|
||
|
|
#include <asm/pgtable.h>
|
||
|
|
#include <asm/page.h>
|
||
|
|
#include <asm/ptrace.h>
|
||
|
|
#include "proc-macros.S"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The size of one data cache line.
|
||
|
|
*/
|
||
|
|
#define CACHE_DLINESIZE 32
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The number of data cache segments.
|
||
|
|
*/
|
||
|
|
#define CACHE_DSEGMENTS 8
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The number of lines in a cache segment.
|
||
|
|
*/
|
||
|
|
#define CACHE_DENTRIES 64
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This is the size at which it becomes more efficient to
|
||
|
|
* clean the whole cache, rather than using the individual
|
||
|
|
* cache line maintenance instructions.
|
||
|
|
*/
|
||
|
|
#define CACHE_DLIMIT 65536
|
||
|
|
|
||
|
|
|
||
|
|
.text
|
||
|
|
/*
|
||
|
|
* cpu_arm920_proc_init()
|
||
|
|
*/
|
||
|
|
ENTRY(cpu_arm920_proc_init)
|
||
|
|
ret lr
|
||
|
|
|
||
|
|
/*
|
||
|
|
* cpu_arm920_proc_fin()
|
||
|
|
*/
|
||
|
|
ENTRY(cpu_arm920_proc_fin)
|
||
|
|
mrc p15, 0, r0, c1, c0, 0 @ ctrl register
|
||
|
|
bic r0, r0, #0x1000 @ ...i............
|
||
|
|
bic r0, r0, #0x000e @ ............wca.
|
||
|
|
mcr p15, 0, r0, c1, c0, 0 @ disable caches
|
||
|
|
ret lr
|
||
|
|
|
||
|
|
/*
|
||
|
|
* cpu_arm920_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
|
||
|
|
.pushsection .idmap.text, "ax"
|
||
|
|
ENTRY(cpu_arm920_reset)
|
||
|
|
mov ip, #0
|
||
|
|
mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
|
||
|
|
mcr p15, 0, ip, c7, c10, 4 @ drain WB
|
||
|
|
#ifdef CONFIG_MMU
|
||
|
|
mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
|
||
|
|
#endif
|
||
|
|
mrc p15, 0, ip, c1, c0, 0 @ ctrl register
|
||
|
|
bic ip, ip, #0x000f @ ............wcam
|
||
|
|
bic ip, ip, #0x1100 @ ...i...s........
|
||
|
|
mcr p15, 0, ip, c1, c0, 0 @ ctrl register
|
||
|
|
ret r0
|
||
|
|
ENDPROC(cpu_arm920_reset)
|
||
|
|
.popsection
|
||
|
|
|
||
|
|
/*
|
||
|
|
* cpu_arm920_do_idle()
|
||
|
|
*/
|
||
|
|
.align 5
|
||
|
|
ENTRY(cpu_arm920_do_idle)
|
||
|
|
mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
|
||
|
|
ret lr
|
||
|
|
|
||
|
|
|
||
|
|
#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
|
||
|
|
|
||
|
|
/*
|
||
|
|
* flush_icache_all()
|
||
|
|
*
|
||
|
|
* Unconditionally clean and invalidate the entire icache.
|
||
|
|
*/
|
||
|
|
ENTRY(arm920_flush_icache_all)
|
||
|
|
mov r0, #0
|
||
|
|
mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
|
||
|
|
ret lr
|
||
|
|
ENDPROC(arm920_flush_icache_all)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* flush_user_cache_all()
|
||
|
|
*
|
||
|
|
* Invalidate all cache entries in a particular address
|
||
|
|
* space.
|
||
|
|
*/
|
||
|
|
ENTRY(arm920_flush_user_cache_all)
|
||
|
|
/* FALLTHROUGH */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* flush_kern_cache_all()
|
||
|
|
*
|
||
|
|
* Clean and invalidate the entire cache.
|
||
|
|
*/
|
||
|
|
ENTRY(arm920_flush_kern_cache_all)
|
||
|
|
mov r2, #VM_EXEC
|
||
|
|
mov ip, #0
|
||
|
|
__flush_whole_cache:
|
||
|
|
mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
|
||
|
|
1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
|
||
|
|
2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
|
||
|
|
subs r3, r3, #1 << 26
|
||
|
|
bcs 2b @ entries 63 to 0
|
||
|
|
subs r1, r1, #1 << 5
|
||
|
|
bcs 1b @ segments 7 to 0
|
||
|
|
tst r2, #VM_EXEC
|
||
|
|
mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
|
||
|
|
mcrne p15, 0, ip, c7, c10, 4 @ drain WB
|
||
|
|
ret lr
|
||
|
|
|
||
|
|
/*
|
||
|
|
* flush_user_cache_range(start, end, flags)
|
||
|
|
*
|
||
|
|
* Invalidate a range of cache entries in the specified
|
||
|
|
* address space.
|
||
|
|
*
|
||
|
|
* - start - start address (inclusive)
|
||
|
|
* - end - end address (exclusive)
|
||
|
|
* - flags - vm_flags for address space
|
||
|
|
*/
|
||
|
|
ENTRY(arm920_flush_user_cache_range)
|
||
|
|
mov ip, #0
|
||
|
|
sub r3, r1, r0 @ calculate total size
|
||
|
|
cmp r3, #CACHE_DLIMIT
|
||
|
|
bhs __flush_whole_cache
|
||
|
|
|
||
|
|
1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
|
||
|
|
tst r2, #VM_EXEC
|
||
|
|
mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
|
||
|
|
add r0, r0, #CACHE_DLINESIZE
|
||
|
|
cmp r0, r1
|
||
|
|
blo 1b
|
||
|
|
tst r2, #VM_EXEC
|
||
|
|
mcrne p15, 0, ip, c7, c10, 4 @ drain WB
|
||
|
|
ret lr
|
||
|
|
|
||
|
|
/*
|
||
|
|
* coherent_kern_range(start, end)
|
||
|
|
*
|
||
|
|
* Ensure coherency between the Icache and the Dcache in the
|
||
|
|
* region described by start, end. If you have non-snooping
|
||
|
|
* Harvard caches, you need to implement this function.
|
||
|
|
*
|
||
|
|
* - start - virtual start address
|
||
|
|
* - end - virtual end address
|
||
|
|
*/
|
||
|
|
ENTRY(arm920_coherent_kern_range)
|
||
|
|
/* FALLTHROUGH */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* coherent_user_range(start, end)
|
||
|
|
*
|
||
|
|
* Ensure coherency between the Icache and the Dcache in the
|
||
|
|
* region described by start, end. If you have non-snooping
|
||
|
|
* Harvard caches, you need to implement this function.
|
||
|
|
*
|
||
|
|
* - start - virtual start address
|
||
|
|
* - end - virtual end address
|
||
|
|
*/
|
||
|
|
ENTRY(arm920_coherent_user_range)
|
||
|
|
bic r0, r0, #CACHE_DLINESIZE - 1
|
||
|
|
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
||
|
|
mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
|
||
|
|
add r0, r0, #CACHE_DLINESIZE
|
||
|
|
cmp r0, r1
|
||
|
|
blo 1b
|
||
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
||
|
|
mov r0, #0
|
||
|
|
ret lr
|
||
|
|
|
||
|
|
/*
|
||
|
|
* flush_kern_dcache_area(void *addr, size_t size)
|
||
|
|
*
|
||
|
|
* Ensure no D cache aliasing occurs, either with itself or
|
||
|
|
* the I cache
|
||
|
|
*
|
||
|
|
* - addr - kernel address
|
||
|
|
* - size - region size
|
||
|
|
*/
|
||
|
|
ENTRY(arm920_flush_kern_dcache_area)
|
||
|
|
add r1, r0, r1
|
||
|
|
1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
|
||
|
|
add r0, r0, #CACHE_DLINESIZE
|
||
|
|
cmp r0, r1
|
||
|
|
blo 1b
|
||
|
|
mov r0, #0
|
||
|
|
mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
|
||
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
||
|
|
ret lr
|
||
|
|
|
||
|
|
/*
|
||
|
|
* dma_inv_range(start, end)
|
||
|
|
*
|
||
|
|
* Invalidate (discard) the specified virtual address range.
|
||
|
|
* May not write back any entries. If 'start' or 'end'
|
||
|
|
* are not cache line aligned, those lines must be written
|
||
|
|
* back.
|
||
|
|
*
|
||
|
|
* - start - virtual start address
|
||
|
|
* - end - virtual end address
|
||
|
|
*
|
||
|
|
* (same as v4wb)
|
||
|
|
*/
|
||
|
|
arm920_dma_inv_range:
|
||
|
|
tst r0, #CACHE_DLINESIZE - 1
|
||
|
|
bic r0, r0, #CACHE_DLINESIZE - 1
|
||
|
|
mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
|
||
|
|
tst r1, #CACHE_DLINESIZE - 1
|
||
|
|
mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
|
||
|
|
1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
|
||
|
|
add r0, r0, #CACHE_DLINESIZE
|
||
|
|
cmp r0, r1
|
||
|
|
blo 1b
|
||
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
||
|
|
ret lr
|
||
|
|
|
||
|
|
/*
|
||
|
|
* dma_clean_range(start, end)
|
||
|
|
*
|
||
|
|
* Clean the specified virtual address range.
|
||
|
|
*
|
||
|
|
* - start - virtual start address
|
||
|
|
* - end - virtual end address
|
||
|
|
*
|
||
|
|
* (same as v4wb)
|
||
|
|
*/
|
||
|
|
arm920_dma_clean_range:
|
||
|
|
bic r0, r0, #CACHE_DLINESIZE - 1
|
||
|
|
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
||
|
|
add r0, r0, #CACHE_DLINESIZE
|
||
|
|
cmp r0, r1
|
||
|
|
blo 1b
|
||
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
||
|
|
ret lr
|
||
|
|
|
||
|
|
/*
|
||
|
|
* dma_flush_range(start, end)
|
||
|
|
*
|
||
|
|
* Clean and invalidate the specified virtual address range.
|
||
|
|
*
|
||
|
|
* - start - virtual start address
|
||
|
|
* - end - virtual end address
|
||
|
|
*/
|
||
|
|
ENTRY(arm920_dma_flush_range)
|
||
|
|
bic r0, r0, #CACHE_DLINESIZE - 1
|
||
|
|
1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
|
||
|
|
add r0, r0, #CACHE_DLINESIZE
|
||
|
|
cmp r0, r1
|
||
|
|
blo 1b
|
||
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
||
|
|
ret lr
|
||
|
|
|
||
|
|
/*
|
||
|
|
* dma_map_area(start, size, dir)
|
||
|
|
* - start - kernel virtual start address
|
||
|
|
* - size - size of region
|
||
|
|
* - dir - DMA direction
|
||
|
|
*/
|
||
|
|
ENTRY(arm920_dma_map_area)
|
||
|
|
add r1, r1, r0
|
||
|
|
cmp r2, #DMA_TO_DEVICE
|
||
|
|
beq arm920_dma_clean_range
|
||
|
|
bcs arm920_dma_inv_range
|
||
|
|
b arm920_dma_flush_range
|
||
|
|
ENDPROC(arm920_dma_map_area)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* dma_unmap_area(start, size, dir)
|
||
|
|
* - start - kernel virtual start address
|
||
|
|
* - size - size of region
|
||
|
|
* - dir - DMA direction
|
||
|
|
*/
|
||
|
|
ENTRY(arm920_dma_unmap_area)
|
||
|
|
ret lr
|
||
|
|
ENDPROC(arm920_dma_unmap_area)
|
||
|
|
|
||
|
|
.globl arm920_flush_kern_cache_louis
|
||
|
|
.equ arm920_flush_kern_cache_louis, arm920_flush_kern_cache_all
|
||
|
|
|
||
|
|
@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
|
||
|
|
define_cache_functions arm920
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
ENTRY(cpu_arm920_dcache_clean_area)
|
||
|
|
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
||
|
|
add r0, r0, #CACHE_DLINESIZE
|
||
|
|
subs r1, r1, #CACHE_DLINESIZE
|
||
|
|
bhi 1b
|
||
|
|
ret lr
|
||
|
|
|
||
|
|
/* =============================== PageTable ============================== */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* cpu_arm920_switch_mm(pgd)
|
||
|
|
*
|
||
|
|
* Set the translation base pointer to be as described by pgd.
|
||
|
|
*
|
||
|
|
* pgd: new page tables
|
||
|
|
*/
|
||
|
|
.align 5
|
||
|
|
ENTRY(cpu_arm920_switch_mm)
|
||
|
|
#ifdef CONFIG_MMU
|
||
|
|
mov ip, #0
|
||
|
|
#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
|
||
|
|
mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
|
||
|
|
#else
|
||
|
|
@ && 'Clean & Invalidate whole DCache'
|
||
|
|
@ && Re-written to use Index Ops.
|
||
|
|
@ && Uses registers r1, r3 and ip
|
||
|
|
|
||
|
|
mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
|
||
|
|
1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
|
||
|
|
2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index
|
||
|
|
subs r3, r3, #1 << 26
|
||
|
|
bcs 2b @ entries 63 to 0
|
||
|
|
subs r1, r1, #1 << 5
|
||
|
|
bcs 1b @ segments 7 to 0
|
||
|
|
#endif
|
||
|
|
mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
|
||
|
|
mcr p15, 0, ip, c7, c10, 4 @ drain WB
|
||
|
|
mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
|
||
|
|
mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
|
||
|
|
#endif
|
||
|
|
ret lr
|
||
|
|
|
||
|
|
/*
|
||
|
|
* cpu_arm920_set_pte(ptep, pte, ext)
|
||
|
|
*
|
||
|
|
* Set a PTE and flush it out
|
||
|
|
*/
|
||
|
|
.align 5
|
||
|
|
ENTRY(cpu_arm920_set_pte_ext)
|
||
|
|
#ifdef CONFIG_MMU
|
||
|
|
armv3_set_pte_ext
|
||
|
|
mov r0, r0
|
||
|
|
mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
||
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
||
|
|
#endif
|
||
|
|
ret lr
|
||
|
|
|
||
|
|
/* Suspend/resume support: taken from arch/arm/plat-s3c24xx/sleep.S */
|
||
|
|
.globl cpu_arm920_suspend_size
|
||
|
|
.equ cpu_arm920_suspend_size, 4 * 3
|
||
|
|
#ifdef CONFIG_ARM_CPU_SUSPEND
|
||
|
|
ENTRY(cpu_arm920_do_suspend)
|
||
|
|
stmfd sp!, {r4 - r6, lr}
|
||
|
|
mrc p15, 0, r4, c13, c0, 0 @ PID
|
||
|
|
mrc p15, 0, r5, c3, c0, 0 @ Domain ID
|
||
|
|
mrc p15, 0, r6, c1, c0, 0 @ Control register
|
||
|
|
stmia r0, {r4 - r6}
|
||
|
|
ldmfd sp!, {r4 - r6, pc}
|
||
|
|
ENDPROC(cpu_arm920_do_suspend)
|
||
|
|
|
||
|
|
ENTRY(cpu_arm920_do_resume)
|
||
|
|
mov ip, #0
|
||
|
|
mcr p15, 0, ip, c8, c7, 0 @ invalidate I+D TLBs
|
||
|
|
mcr p15, 0, ip, c7, c7, 0 @ invalidate I+D caches
|
||
|
|
ldmia r0, {r4 - r6}
|
||
|
|
mcr p15, 0, r4, c13, c0, 0 @ PID
|
||
|
|
mcr p15, 0, r5, c3, c0, 0 @ Domain ID
|
||
|
|
mcr p15, 0, r1, c2, c0, 0 @ TTB address
|
||
|
|
mov r0, r6 @ control register
|
||
|
|
b cpu_resume_mmu
|
||
|
|
ENDPROC(cpu_arm920_do_resume)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
.type __arm920_setup, #function
|
||
|
|
__arm920_setup:
|
||
|
|
mov r0, #0
|
||
|
|
mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
|
||
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
|
||
|
|
#ifdef CONFIG_MMU
|
||
|
|
mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
|
||
|
|
#endif
|
||
|
|
adr r5, arm920_crval
|
||
|
|
ldmia r5, {r5, r6}
|
||
|
|
mrc p15, 0, r0, c1, c0 @ get control register v4
|
||
|
|
bic r0, r0, r5
|
||
|
|
orr r0, r0, r6
|
||
|
|
ret lr
|
||
|
|
.size __arm920_setup, . - __arm920_setup
|
||
|
|
|
||
|
|
/*
|
||
|
|
* R
|
||
|
|
* .RVI ZFRS BLDP WCAM
|
||
|
|
* ..11 0001 ..11 0101
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
.type arm920_crval, #object
|
||
|
|
arm920_crval:
|
||
|
|
crval clear=0x00003f3f, mmuset=0x00003135, ucset=0x00001130
|
||
|
|
|
||
|
|
__INITDATA
|
||
|
|
@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
|
||
|
|
define_processor_functions arm920, dabort=v4t_early_abort, pabort=legacy_pabort, suspend=1
|
||
|
|
|
||
|
|
.section ".rodata"
|
||
|
|
|
||
|
|
string cpu_arch_name, "armv4t"
|
||
|
|
string cpu_elf_name, "v4"
|
||
|
|
string cpu_arm920_name, "ARM920T"
|
||
|
|
|
||
|
|
.align
|
||
|
|
|
||
|
|
.section ".proc.info.init", #alloc
|
||
|
|
|
||
|
|
.type __arm920_proc_info,#object
|
||
|
|
__arm920_proc_info:
|
||
|
|
.long 0x41009200
|
||
|
|
.long 0xff00fff0
|
||
|
|
.long PMD_TYPE_SECT | \
|
||
|
|
PMD_SECT_BUFFERABLE | \
|
||
|
|
PMD_SECT_CACHEABLE | \
|
||
|
|
PMD_BIT4 | \
|
||
|
|
PMD_SECT_AP_WRITE | \
|
||
|
|
PMD_SECT_AP_READ
|
||
|
|
.long PMD_TYPE_SECT | \
|
||
|
|
PMD_BIT4 | \
|
||
|
|
PMD_SECT_AP_WRITE | \
|
||
|
|
PMD_SECT_AP_READ
|
||
|
|
initfn __arm920_setup, __arm920_proc_info
|
||
|
|
.long cpu_arch_name
|
||
|
|
.long cpu_elf_name
|
||
|
|
.long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
|
||
|
|
.long cpu_arm920_name
|
||
|
|
.long arm920_processor_functions
|
||
|
|
.long v4wbi_tlb_fns
|
||
|
|
.long v4wb_user_fns
|
||
|
|
#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
|
||
|
|
.long arm920_cache_fns
|
||
|
|
#else
|
||
|
|
.long v4wt_cache_fns
|
||
|
|
#endif
|
||
|
|
.size __arm920_proc_info, . - __arm920_proc_info
|