/* $OpenBSD: cpufunc_asm_xscale.S,v 1.2 2005/01/02 19:57:57 drahn Exp $ */
/* $NetBSD: cpufunc_asm_xscale.S,v 1.16 2002/08/17 16:36:32 thorpej Exp $ */
/*
* Copyright (c) 2001, 2002 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Allen Briggs and Jason R. Thorpe for Wasabi Systems, Inc.
*
* 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 for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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.
*/
/*
* Copyright (c) 2001 Matt Thomas.
* 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.
*
* XScale assembly functions for CPU / MMU / TLB specific operations
*/
#include <machine/cpu.h>
#include <machine/asm.h>
/*
* Size of the XScale core D-cache.
*/
#define DCACHE_SIZE 0x00008000
#ifndef CACHE_CLEAN_BLOCK_INTR
.Lblock_userspace_access:
.word _C_LABEL(block_userspace_access)
#endif
/*
* CPWAIT -- Canonical method to wait for CP15 update.
* From: Intel 80200 manual, section 2.3.3.
*
* NOTE: Clobbers the specified temp reg.
*/
#define CPWAIT_BRANCH \
sub pc, pc, #4
#define CPWAIT(tmp) \
mrc p15, 0, tmp, c2, c0, 0 /* arbitrary read of CP15 */ ;\
mov tmp, tmp /* wait for it to complete */ ;\
CPWAIT_BRANCH /* branch to next insn */
#define CPWAIT_AND_RETURN_SHIFTER lsr #32
#define CPWAIT_AND_RETURN(tmp) \
mrc p15, 0, tmp, c2, c0, 0 /* arbitrary read of CP15 */ ;\
/* Wait for it to complete and branch to the return address */ \
sub pc, lr, tmp, CPWAIT_AND_RETURN_SHIFTER
ENTRY(xscale_cpwait)
CPWAIT_AND_RETURN(r0)
/*
* We need a separate cpu_control() entry point, since we have to
* invalidate the Branch Target Buffer in the event the BPRD bit
* changes in the control register.
*/
ENTRY(xscale_control)
mrc p15, 0, r3, c1, c0, 0 /* Read the control register */
bic r2, r3, r0 /* Clear bits */
eor r2, r2, r1 /* XOR bits */
teq r2, r3 /* Only write if there was a change */
mcrne p15, 0, r0, c7, c5, 6 /* Invalidate the BTB */
mcrne p15, 0, r2, c1, c0, 0 /* Write new control register */
mov r0, r3 /* Return old value */
CPWAIT_AND_RETURN(r1)
/*
* 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(xscale_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(xscale_cache_cleanID)
mcr p15, 0, r0, c7, c5, 0 /* invalidate I$ and BTB */
mcr p15, 0, r0, c7, c10, 4 /* drain write and fill buffer */
CPWAIT(r0)
ldmfd sp!, {r0-r3, lr}
/* 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 */
CPWAIT(r0)
#ifdef CACHE_CLEAN_BLOCK_INTR
msr cpsr_all, r3
#else
str r2, [r3]
#endif
mov pc, lr
/*
* TLB functions
*
* Note: We don't need to worry about issuing a CPWAIT after
* TLB operations, because we expect a pmap_update() to follow.
*/
ENTRY(xscale_tlb_flushID_SE)
mcr p15, 0, r0, c8, c6, 1 /* flush D tlb single entry */
mcr p15, 0, r0, c8, c5, 1 /* flush I tlb single entry */
mov pc, lr
/*
* Cache functions
*/
ENTRY(xscale_cache_flushID)
mcr p15, 0, r0, c7, c7, 0 /* flush I+D cache */
CPWAIT_AND_RETURN(r0)
ENTRY(xscale_cache_flushI)
mcr p15, 0, r0, c7, c5, 0 /* flush I cache */
CPWAIT_AND_RETURN(r0)
ENTRY(xscale_cache_flushD)
mcr p15, 0, r0, c7, c6, 0 /* flush D cache */
CPWAIT_AND_RETURN(r0)
ENTRY(xscale_cache_flushI_SE)
mcr p15, 0, r0, c7, c5, 1 /* flush I cache single entry */
CPWAIT_AND_RETURN(r0)
ENTRY(xscale_cache_flushD_SE)
/*
* Errata (rev < 2): Must clean-dcache-line to an address
* before invalidate-dcache-line to an address, or dirty
* bits will not be cleared in the dcache array.
*/
mcr p15, 0, r0, c7, c10, 1
mcr p15, 0, r0, c7, c6, 1 /* flush D cache single entry */
CPWAIT_AND_RETURN(r0)
ENTRY(xscale_cache_cleanD_E)
mcr p15, 0, r0, c7, c10, 1 /* clean D cache entry */
CPWAIT_AND_RETURN(r0)
/*
* Information for the XScale cache clean/purge functions:
*
* * Virtual address of the memory region to use
* * Size of memory region
*
* Note the virtual address for the Data cache clean operation
* does not need to be backed by physical memory, since no loads
* will actually be performed by the allocate-line operation.
*
* Note that the Mini-Data cache MUST be cleaned by executing
* loads from memory mapped into a region reserved exclusively
* for cleaning of the Mini-Data cache.
*/
.data
.global _C_LABEL(xscale_cache_clean_addr)
_C_LABEL(xscale_cache_clean_addr):
.word 0x00000000
.global _C_LABEL(xscale_cache_clean_size)
_C_LABEL(xscale_cache_clean_size):
.word DCACHE_SIZE
# .global _C_LABEL(xscale_minidata_clean_addr)
#_C_LABEL(xscale_minidata_clean_addr):
# .word 0x00000000
# .global _C_LABEL(xscale_minidata_clean_size)
#_C_LABEL(xscale_minidata_clean_size):
# .word 0x00000800
.text
.Lxscale_cache_clean_addr:
.word _C_LABEL(xscale_cache_clean_addr)
.Lxscale_cache_clean_size:
.word _C_LABEL(xscale_cache_clean_size)
.Lxscale_minidata_clean_addr:
.word _C_LABEL(xscale_minidata_clean_addr)
.Lxscale_minidata_clean_size:
.word _C_LABEL(xscale_minidata_clean_size)
#ifdef CACHE_CLEAN_BLOCK_INTR
#define XSCALE_CACHE_CLEAN_BLOCK \
mrs r3, cpsr_all ; \
orr r0, r3, #(I32_bit | F32_bit) ; \
msr cpsr_all, r0
#define XSCALE_CACHE_CLEAN_UNBLOCK \
msr cpsr_all, r3
#else
#define XSCALE_CACHE_CLEAN_BLOCK \
ldr r3, .Lblock_userspace_access ; \
ldr ip, [r3] ; \
orr r0, ip, #1 ; \
str r0, [r3]
#define XSCALE_CACHE_CLEAN_UNBLOCK \
str ip, [r3]
#endif /* CACHE_CLEAN_BLOCK_INTR */
#define XSCALE_CACHE_CLEAN_PROLOGUE \
XSCALE_CACHE_CLEAN_BLOCK ; \
ldr r2, .Lxscale_cache_clean_addr ; \
ldmia r2, {r0, r1} ; \
/* \
* BUG ALERT! \
* \
* The XScale core has a strange cache eviction bug, which \
* requires us to use 2x the cache size for the cache clean \
* and for that area to be aligned to 2 * cache size. \
* \
* The work-around is to use 2 areas for cache clean, and to \
* alternate between them whenever this is done. No one knows \
* why the work-around works (mmm!). \
*/ \
eor r0, r0, #(DCACHE_SIZE) ; \
str r0, [r2] ; \
add r0, r0, r1
#define XSCALE_CACHE_CLEAN_EPILOGUE \
XSCALE_CACHE_CLEAN_UNBLOCK
ENTRY_NP(xscale_cache_syncI)
ENTRY_NP(xscale_cache_purgeID)
mcr p15, 0, r0, c7, c5, 0 /* flush I cache (D cleaned below) */
ENTRY_NP(xscale_cache_cleanID)
ENTRY_NP(xscale_cache_purgeD)
ENTRY(xscale_cache_cleanD)
XSCALE_CACHE_CLEAN_PROLOGUE
1: subs r0, r0, #32
mcr p15, 0, r0, c7, c2, 5 /* allocate cache line */
subs r1, r1, #32
bne 1b
CPWAIT(r0)
mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
CPWAIT(r0)
XSCALE_CACHE_CLEAN_EPILOGUE
mov pc, lr
/*
* Clean the mini-data cache.
*
* It's expected that we only use the mini-data cache for
* kernel addresses, so there is no need to purge it on
* context switch, and no need to prevent userspace access
* while we clean it.
*/
ENTRY(xscale_cache_clean_minidata)
ldr r2, .Lxscale_minidata_clean_addr
ldmia r2, {r0, r1}
1: ldr r3, [r0], #32
subs r1, r1, #32
bne 1b
mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
CPWAIT_AND_RETURN(r1)
ENTRY(xscale_cache_purgeID_E)
mcr p15, 0, r0, c7, c10, 1 /* clean D cache entry */
CPWAIT(r1)
mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
mcr p15, 0, r0, c7, c5, 1 /* flush I cache single entry */
mcr p15, 0, r0, c7, c6, 1 /* flush D cache single entry */
CPWAIT_AND_RETURN(r1)
ENTRY(xscale_cache_purgeD_E)
mcr p15, 0, r0, c7, c10, 1 /* clean D cache entry */
CPWAIT(r1)
mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
mcr p15, 0, r0, c7, c6, 1 /* flush D cache single entry */
CPWAIT_AND_RETURN(r1)
/*
* Soft functions
*/
/* xscale_cache_syncI is identical to xscale_cache_purgeID */
ENTRY(xscale_cache_cleanID_rng)
ENTRY(xscale_cache_cleanD_rng)
cmp r1, #0x4000
bcs _C_LABEL(xscale_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
CPWAIT(r0)
mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
CPWAIT_AND_RETURN(r0)
ENTRY(xscale_cache_purgeID_rng)
cmp r1, #0x4000
bcs _C_LABEL(xscale_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 */
mcr p15, 0, r0, c7, c5, 1 /* flush I cache single entry */
add r0, r0, #32
subs r1, r1, #32
bhi 1b
CPWAIT(r0)
mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
CPWAIT_AND_RETURN(r0)
ENTRY(xscale_cache_purgeD_rng)
cmp r1, #0x4000
bcs _C_LABEL(xscale_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
CPWAIT(r0)
mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
CPWAIT_AND_RETURN(r0)
ENTRY(xscale_cache_syncI_rng)
cmp r1, #0x4000
bcs _C_LABEL(xscale_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 */
mcr p15, 0, r0, c7, c5, 1 /* flush I cache single entry */
add r0, r0, #32
subs r1, r1, #32
bhi 1b
CPWAIT(r0)
mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
CPWAIT_AND_RETURN(r0)
ENTRY(xscale_cache_flushD_rng)
and r2, r0, #0x1f
add r1, r1, r2
bic r0, r0, #0x1f
1: 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 */
CPWAIT_AND_RETURN(r0)
/*
* 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
*/
ENTRY(xscale_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 */
CPWAIT_AND_RETURN(r0)
/*
* xscale_cpu_sleep
*
* This is called when there is nothing on any of the run queues.
* We go into IDLE mode so that any IRQ or FIQ will awaken us.
*
* If this is called with anything other than ARM_SLEEP_MODE_IDLE,
* ignore it.
*/
ENTRY(xscale_cpu_sleep)
tst r0, #0x00000000
bne 1f
mov r0, #0x1
mcr p14, 0, r0, c7, c0, 0
1:
mov pc, lr
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