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/* $NetBSD: cpufunc_asm_sa1.S,v 1.8 2002/08/17 16:36:32 thorpej Exp $ */
/*-
* Copyright (c) 1997,1998 Mark Brinicombe.
* Copyright (c) 1997 Causality Limited
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Causality Limited.
* 4. The name of Causality Limited may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY CAUSALITY LIMITED ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL CAUSALITY LIMITED BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* SA-1 assembly functions for CPU / MMU / TLB specific operations
*
*/
#include <machine/asm.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/arm/arm/cpufunc_asm_sa1.S 139735 2005-01-05 21:58:49Z imp $");
.Lblock_userspace_access:
.word _C_LABEL(block_userspace_access)
/*
* Functions to set the MMU Translation Table Base register
*
* We need to clean and flush the cache as it uses virtual
* addresses that are about to change.
*/
ENTRY(getttb)
mrc p15, 0, r0, c2, c0, 0
ENTRY(sa1_setttb)
#ifdef CACHE_CLEAN_BLOCK_INTR
mrs r3, cpsr_all
orr r1, r3, #(I32_bit | F32_bit)
msr cpsr_all, r1
#else
ldr r3, .Lblock_userspace_access
ldr r2, [r3]
orr r1, r2, #1
str r1, [r3]
#endif
stmfd sp!, {r0-r3, lr}
bl _C_LABEL(sa1_cache_cleanID)
ldmfd sp!, {r0-r3, lr}
mcr p15, 0, r0, c7, c5, 0 /* invalidate I$ and BTB */
mcr p15, 0, r0, c7, c10, 4 /* drain write and fill buffer */
/* Write the TTB */
mcr p15, 0, r0, c2, c0, 0
/* If we have updated the TTB we must flush the TLB */
mcr p15, 0, r0, c8, c7, 0 /* invalidate I+D TLB */
/* The cleanID above means we only need to flush the I cache here */
mcr p15, 0, r0, c7, c5, 0 /* invalidate I$ and BTB */
/* Make sure that pipeline is emptied */
mov r0, r0
mov r0, r0
#ifdef CACHE_CLEAN_BLOCK_INTR
msr cpsr_all, r3
#else
str r2, [r3]
#endif
RET
/*
* TLB functions
*/
ENTRY(sa1_tlb_flushID_SE)
mcr p15, 0, r0, c8, c6, 1 /* flush D tlb single entry */
mcr p15, 0, r0, c8, c5, 0 /* flush I tlb */
RET
/*
* Cache functions
*/
ENTRY(sa1_cache_flushID)
mcr p15, 0, r0, c7, c7, 0 /* flush I+D cache */
RET
ENTRY(sa1_cache_flushI)
mcr p15, 0, r0, c7, c5, 0 /* flush I cache */
RET
ENTRY(sa1_cache_flushD)
mcr p15, 0, r0, c7, c6, 0 /* flush D cache */
RET
ENTRY(sa1_cache_flushD_SE)
mcr p15, 0, r0, c7, c6, 1 /* flush D cache single entry */
RET
ENTRY(sa1_cache_cleanD_E)
mcr p15, 0, r0, c7, c10, 1 /* clean D cache entry */
RET
/*
* Information for the SA-1 cache clean/purge functions:
*
* * Virtual address of the memory region to use
* * Size of memory region
*/
.data
.global _C_LABEL(sa1_cache_clean_addr)
_C_LABEL(sa1_cache_clean_addr):
.word 0xf0000000
.global _C_LABEL(sa1_cache_clean_size)
_C_LABEL(sa1_cache_clean_size):
#if defined(CPU_SA1100) || defined(CPU_SA1110)
.word 0x00004000
#else
.word 0x00008000
#endif
.text
.Lsa1_cache_clean_addr:
.word _C_LABEL(sa1_cache_clean_addr)
.Lsa1_cache_clean_size:
.word _C_LABEL(sa1_cache_clean_size)
#ifdef CACHE_CLEAN_BLOCK_INTR
#define SA1_CACHE_CLEAN_BLOCK \
mrs r3, cpsr_all ; \
orr r0, r3, #(I32_bit | F32_bit) ; \
msr cpsr_all, r0
#define SA1_CACHE_CLEAN_UNBLOCK \
msr cpsr_all, r3
#else
#define SA1_CACHE_CLEAN_BLOCK \
ldr r3, .Lblock_userspace_access ; \
ldr ip, [r3] ; \
orr r0, ip, #1 ; \
str r0, [r3]
#define SA1_CACHE_CLEAN_UNBLOCK \
str ip, [r3]
#endif /* CACHE_CLEAN_BLOCK_INTR */
#ifdef DOUBLE_CACHE_CLEAN_BANK
#define SA1_DOUBLE_CACHE_CLEAN_BANK \
eor r0, r0, r1 ; \
str r0, [r2]
#else
#define SA1_DOUBLE_CACHE_CLEAN_BANK /* nothing */
#endif /* DOUBLE_CACHE_CLEAN_BANK */
#define SA1_CACHE_CLEAN_PROLOGUE \
SA1_CACHE_CLEAN_BLOCK ; \
ldr r2, .Lsa1_cache_clean_addr ; \
ldmia r2, {r0, r1} ; \
SA1_DOUBLE_CACHE_CLEAN_BANK
#define SA1_CACHE_CLEAN_EPILOGUE \
SA1_CACHE_CLEAN_UNBLOCK
ENTRY_NP(sa1_cache_syncI)
ENTRY_NP(sa1_cache_purgeID)
mcr p15, 0, r0, c7, c5, 0 /* flush I cache (D cleaned below) */
ENTRY_NP(sa1_cache_cleanID)
ENTRY_NP(sa1_cache_purgeD)
ENTRY(sa1_cache_cleanD)
SA1_CACHE_CLEAN_PROLOGUE
1: ldr r2, [r0], #32
subs r1, r1, #32
bne 1b
mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
SA1_CACHE_CLEAN_EPILOGUE
RET
ENTRY(sa1_cache_purgeID_E)
mcr p15, 0, r0, c7, c10, 1 /* clean dcache entry */
mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
mcr p15, 0, r0, c7, c5, 0 /* flush I cache */
mcr p15, 0, r0, c7, c6, 1 /* flush D cache single entry */
RET
ENTRY(sa1_cache_purgeD_E)
mcr p15, 0, r0, c7, c10, 1 /* clean dcache entry */
mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
mcr p15, 0, r0, c7, c6, 1 /* flush D cache single entry */
RET
/*
* Soft functions
*/
/* sa1_cache_syncI is identical to sa1_cache_purgeID */
ENTRY(sa1_cache_cleanID_rng)
ENTRY(sa1_cache_cleanD_rng)
cmp r1, #0x4000
bcs _C_LABEL(sa1_cache_cleanID)
and r2, r0, #0x1f
add r1, r1, r2
bic r0, r0, #0x1f
1: mcr p15, 0, r0, c7, c10, 1 /* clean D cache entry */
add r0, r0, #32
subs r1, r1, #32
bhi 1b
mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
RET
ENTRY(sa1_cache_purgeID_rng)
cmp r1, #0x4000
bcs _C_LABEL(sa1_cache_purgeID)
and r2, r0, #0x1f
add r1, r1, r2
bic r0, r0, #0x1f
1: mcr p15, 0, r0, c7, c10, 1 /* clean D cache entry */
mcr p15, 0, r0, c7, c6, 1 /* flush D cache single entry */
add r0, r0, #32
subs r1, r1, #32
bhi 1b
mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
mcr p15, 0, r0, c7, c5, 0 /* flush I cache */
RET
ENTRY(sa1_cache_purgeD_rng)
cmp r1, #0x4000
bcs _C_LABEL(sa1_cache_purgeD)
and r2, r0, #0x1f
add r1, r1, r2
bic r0, r0, #0x1f
1: mcr p15, 0, r0, c7, c10, 1 /* clean D cache entry */
mcr p15, 0, r0, c7, c6, 1 /* flush D cache single entry */
add r0, r0, #32
subs r1, r1, #32
bhi 1b
mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
RET
ENTRY(sa1_cache_syncI_rng)
cmp r1, #0x4000
bcs _C_LABEL(sa1_cache_syncI)
and r2, r0, #0x1f
add r1, r1, r2
bic r0, r0, #0x1f
1: mcr p15, 0, r0, c7, c10, 1 /* clean D cache entry */
add r0, r0, #32
subs r1, r1, #32
bhi 1b
mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
mcr p15, 0, r0, c7, c5, 0 /* flush I cache */
RET
/*
* Context switch.
*
* These is the CPU-specific parts of the context switcher cpu_switch()
* These functions actually perform the TTB reload.
*
* NOTE: Special calling convention
* r1, r4-r13 must be preserved
*/
#if defined(CPU_SA110)
ENTRY(sa110_context_switch)
/*
* CF_CACHE_PURGE_ID will *ALWAYS* be called prior to this.
* Thus the data cache will contain only kernel data and the
* instruction cache will contain only kernel code, and all
* kernel mappings are shared by all processes.
*/
/* Write the TTB */
mcr p15, 0, r0, c2, c0, 0
/* If we have updated the TTB we must flush the TLB */
mcr p15, 0, r0, c8, c7, 0 /* flush the I+D tlb */
/* Make sure that pipeline is emptied */
mov r0, r0
mov r0, r0
RET
#endif