mirror of
https://github.com/torvalds/linux.git
synced 2024-12-15 07:33:56 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
324 lines
7.6 KiB
ArmAsm
324 lines
7.6 KiB
ArmAsm
/*
|
|
* linux/arch/arm/mm/proc-sa1100.S
|
|
*
|
|
* Copyright (C) 1997-2002 Russell King
|
|
*
|
|
* 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.
|
|
*
|
|
* MMU functions for SA110
|
|
*
|
|
* These are the low level assembler for performing cache and TLB
|
|
* functions on the StrongARM-1100 and StrongARM-1110.
|
|
*
|
|
* Note that SA1100 and SA1110 share everything but their name and CPU ID.
|
|
*
|
|
* 12-jun-2000, Erik Mouw (J.A.K.Mouw@its.tudelft.nl):
|
|
* Flush the read buffer at context switches
|
|
*/
|
|
#include <linux/linkage.h>
|
|
#include <linux/init.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/constants.h>
|
|
#include <asm/procinfo.h>
|
|
#include <asm/hardware.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
/*
|
|
* the cache line size of the I and D cache
|
|
*/
|
|
#define DCACHELINESIZE 32
|
|
#define FLUSH_OFFSET 32768
|
|
|
|
.macro flush_1100_dcache rd, ra, re
|
|
ldr \rd, =flush_base
|
|
ldr \ra, [\rd]
|
|
eor \ra, \ra, #FLUSH_OFFSET
|
|
str \ra, [\rd]
|
|
add \re, \ra, #8192 @ only necessary for 8k
|
|
1001: ldr \rd, [\ra], #DCACHELINESIZE
|
|
teq \re, \ra
|
|
bne 1001b
|
|
#ifdef FLUSH_BASE_MINICACHE
|
|
add \ra, \ra, #FLUSH_BASE_MINICACHE - FLUSH_BASE
|
|
add \re, \ra, #512 @ only 512 bytes
|
|
1002: ldr \rd, [\ra], #DCACHELINESIZE
|
|
teq \re, \ra
|
|
bne 1002b
|
|
#endif
|
|
.endm
|
|
|
|
.data
|
|
flush_base:
|
|
.long FLUSH_BASE
|
|
.text
|
|
|
|
__INIT
|
|
|
|
/*
|
|
* cpu_sa1100_proc_init()
|
|
*/
|
|
ENTRY(cpu_sa1100_proc_init)
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching
|
|
mcr p15, 0, r0, c9, c0, 5 @ Allow read-buffer operations from userland
|
|
mov pc, lr
|
|
|
|
.previous
|
|
|
|
/*
|
|
* cpu_sa1100_proc_fin()
|
|
*
|
|
* Prepare the CPU for reset:
|
|
* - Disable interrupts
|
|
* - Clean and turn off caches.
|
|
*/
|
|
ENTRY(cpu_sa1100_proc_fin)
|
|
stmfd sp!, {lr}
|
|
mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
|
|
msr cpsr_c, ip
|
|
flush_1100_dcache r0, r1, r2 @ clean caches
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c15, c2, 2 @ Disable clock switching
|
|
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
|
|
ldmfd sp!, {pc}
|
|
|
|
/*
|
|
* cpu_sa1100_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_sa1100_reset)
|
|
mov ip, #0
|
|
mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
|
|
mcr p15, 0, ip, c7, c10, 4 @ drain WB
|
|
mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
|
|
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
|
|
mov pc, r0
|
|
|
|
/*
|
|
* cpu_sa1100_do_idle(type)
|
|
*
|
|
* Cause the processor to idle
|
|
*
|
|
* type: call type:
|
|
* 0 = slow idle
|
|
* 1 = fast idle
|
|
* 2 = switch to slow processor clock
|
|
* 3 = switch to fast processor clock
|
|
*/
|
|
.align 5
|
|
ENTRY(cpu_sa1100_do_idle)
|
|
mov r0, r0 @ 4 nop padding
|
|
mov r0, r0
|
|
mov r0, r0
|
|
mov r0, r0 @ 4 nop padding
|
|
mov r0, r0
|
|
mov r0, r0
|
|
mov r0, #0
|
|
ldr r1, =UNCACHEABLE_ADDR @ ptr to uncacheable address
|
|
@ --- aligned to a cache line
|
|
mcr p15, 0, r0, c15, c2, 2 @ disable clock switching
|
|
ldr r1, [r1, #0] @ force switch to MCLK
|
|
mcr p15, 0, r0, c15, c8, 2 @ wait for interrupt
|
|
mov r0, r0 @ safety
|
|
mcr p15, 0, r0, c15, c1, 2 @ enable clock switching
|
|
mov pc, lr
|
|
|
|
/* ================================= CACHE ================================ */
|
|
|
|
/*
|
|
* cpu_sa1100_dcache_clean_area(addr,sz)
|
|
*
|
|
* Clean the specified entry of any caches such that the MMU
|
|
* translation fetches will obtain correct data.
|
|
*
|
|
* addr: cache-unaligned virtual address
|
|
*/
|
|
.align 5
|
|
ENTRY(cpu_sa1100_dcache_clean_area)
|
|
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
add r0, r0, #DCACHELINESIZE
|
|
subs r1, r1, #DCACHELINESIZE
|
|
bhi 1b
|
|
mov pc, lr
|
|
|
|
/* =============================== PageTable ============================== */
|
|
|
|
/*
|
|
* cpu_sa1100_switch_mm(pgd)
|
|
*
|
|
* Set the translation base pointer to be as described by pgd.
|
|
*
|
|
* pgd: new page tables
|
|
*/
|
|
.align 5
|
|
ENTRY(cpu_sa1100_switch_mm)
|
|
flush_1100_dcache r3, ip, r1
|
|
mov ip, #0
|
|
mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
|
|
mcr p15, 0, ip, c9, c0, 0 @ invalidate RB
|
|
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
|
|
mov pc, lr
|
|
|
|
/*
|
|
* cpu_sa1100_set_pte(ptep, pte)
|
|
*
|
|
* Set a PTE and flush it out
|
|
*/
|
|
.align 5
|
|
ENTRY(cpu_sa1100_set_pte)
|
|
str r1, [r0], #-2048 @ linux version
|
|
|
|
eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
|
|
|
|
bic r2, r1, #PTE_SMALL_AP_MASK
|
|
bic r2, r2, #PTE_TYPE_MASK
|
|
orr r2, r2, #PTE_TYPE_SMALL
|
|
|
|
tst r1, #L_PTE_USER @ User?
|
|
orrne r2, r2, #PTE_SMALL_AP_URO_SRW
|
|
|
|
tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
|
|
orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
|
|
|
|
tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
|
|
movne r2, #0
|
|
|
|
str r2, [r0] @ hardware version
|
|
mov r0, r0
|
|
mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
|
mov pc, lr
|
|
|
|
__INIT
|
|
|
|
.type __sa1100_setup, #function
|
|
__sa1100_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
|
|
mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
|
|
mrc p15, 0, r0, c1, c0 @ get control register v4
|
|
ldr r5, sa1100_cr1_clear
|
|
bic r0, r0, r5
|
|
ldr r5, sa1100_cr1_set
|
|
orr r0, r0, r5
|
|
mov pc, lr
|
|
.size __sa1100_setup, . - __sa1100_setup
|
|
|
|
/*
|
|
* R
|
|
* .RVI ZFRS BLDP WCAM
|
|
* ..11 0001 ..11 1101
|
|
*
|
|
*/
|
|
.type sa1100_cr1_clear, #object
|
|
.type sa1100_cr1_set, #object
|
|
sa1100_cr1_clear:
|
|
.word 0x3f3f
|
|
sa1100_cr1_set:
|
|
.word 0x313d
|
|
|
|
__INITDATA
|
|
|
|
/*
|
|
* Purpose : Function pointers used to access above functions - all calls
|
|
* come through these
|
|
*/
|
|
|
|
/*
|
|
* SA1100 and SA1110 share the same function calls
|
|
*/
|
|
.type sa1100_processor_functions, #object
|
|
ENTRY(sa1100_processor_functions)
|
|
.word v4_early_abort
|
|
.word cpu_sa1100_proc_init
|
|
.word cpu_sa1100_proc_fin
|
|
.word cpu_sa1100_reset
|
|
.word cpu_sa1100_do_idle
|
|
.word cpu_sa1100_dcache_clean_area
|
|
.word cpu_sa1100_switch_mm
|
|
.word cpu_sa1100_set_pte
|
|
.size sa1100_processor_functions, . - sa1100_processor_functions
|
|
|
|
.section ".rodata"
|
|
|
|
.type cpu_arch_name, #object
|
|
cpu_arch_name:
|
|
.asciz "armv4"
|
|
.size cpu_arch_name, . - cpu_arch_name
|
|
|
|
.type cpu_elf_name, #object
|
|
cpu_elf_name:
|
|
.asciz "v4"
|
|
.size cpu_elf_name, . - cpu_elf_name
|
|
|
|
.type cpu_sa1100_name, #object
|
|
cpu_sa1100_name:
|
|
.asciz "StrongARM-1100"
|
|
.size cpu_sa1100_name, . - cpu_sa1100_name
|
|
|
|
.type cpu_sa1110_name, #object
|
|
cpu_sa1110_name:
|
|
.asciz "StrongARM-1110"
|
|
.size cpu_sa1110_name, . - cpu_sa1110_name
|
|
|
|
.align
|
|
|
|
.section ".proc.info", #alloc, #execinstr
|
|
|
|
.type __sa1100_proc_info,#object
|
|
__sa1100_proc_info:
|
|
.long 0x4401a110
|
|
.long 0xfffffff0
|
|
.long PMD_TYPE_SECT | \
|
|
PMD_SECT_BUFFERABLE | \
|
|
PMD_SECT_CACHEABLE | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ
|
|
b __sa1100_setup
|
|
.long cpu_arch_name
|
|
.long cpu_elf_name
|
|
.long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
|
|
.long cpu_sa1100_name
|
|
.long sa1100_processor_functions
|
|
.long v4wb_tlb_fns
|
|
.long v4_mc_user_fns
|
|
.long v4wb_cache_fns
|
|
.size __sa1100_proc_info, . - __sa1100_proc_info
|
|
|
|
.type __sa1110_proc_info,#object
|
|
__sa1110_proc_info:
|
|
.long 0x6901b110
|
|
.long 0xfffffff0
|
|
.long PMD_TYPE_SECT | \
|
|
PMD_SECT_BUFFERABLE | \
|
|
PMD_SECT_CACHEABLE | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ
|
|
b __sa1100_setup
|
|
.long cpu_arch_name
|
|
.long cpu_elf_name
|
|
.long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
|
|
.long cpu_sa1110_name
|
|
.long sa1100_processor_functions
|
|
.long v4wb_tlb_fns
|
|
.long v4_mc_user_fns
|
|
.long v4wb_cache_fns
|
|
.size __sa1110_proc_info, . - __sa1110_proc_info
|