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/* $NetBSD: cpufunc_asm_arm8.S,v 1.2 2001/11/11 00:47:49 thorpej Exp $ */
/*-
* Copyright (c) 1997 ARM Limited
* 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.
*
* ARM8 assembly functions for CPU / MMU / TLB specific operations
*
*/
#include <machine/asm.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/arm/arm/cpufunc_asm_arm8.S 139735 2005-01-05 21:58:49Z imp $");
ENTRY(arm8_clock_config)
mrc p15, 0, r3, c15, c0, 0 /* Read the clock register */
bic r2, r3, #0x11 /* turn off dynamic clocking
and clear L bit */
mcr p15, 0, r2, c15, c0, 0 /* Write clock register */
bic r2, r3, r0 /* Clear bits */
eor r2, r2, r1 /* XOR bits */
bic r2, r2, #0x10 /* clear the L bit */
bic r1, r2, #0x01 /* still keep dynamic clocking off */
mcr p15, 0, r1, c15, c0, 0 /* Write clock register */
mov r0, r0 /* NOP */
mov r0, r0 /* NOP */
mov r0, r0 /* NOP */
mov r0, r0 /* NOP */
mcr p15, 0, r2, c15, c0, 0 /* Write clock register */
mov r0, r3 /* Return old value */
RET
/*
* 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(arm8_setttb)
mrs r3, cpsr_all
orr r1, r3, #(I32_bit | F32_bit)
msr cpsr_all, r1
stmfd sp!, {r0-r3, lr}
bl _C_LABEL(arm8_cache_cleanID)
ldmfd sp!, {r0-r3, lr}
mcr p15, 0, r0, c7, c7, 0 /* flush I+D cache */
/* 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
/* For good measure we will flush the IDC as well */
mcr p15, 0, r0, c7, c7, 0
/* Make sure that pipeline is emptied */
mov r0, r0
mov r0, r0
msr cpsr_all, r3
RET
/*
* TLB functions
*/
ENTRY(arm8_tlb_flushID)
mcr p15, 0, r0, c8, c7, 0 /* flush I+D tlb */
RET
ENTRY(arm8_tlb_flushID_SE)
mcr p15, 0, r0, c8, c7, 1 /* flush I+D tlb single entry */
RET
/*
* Cache functions
*/
ENTRY(arm8_cache_flushID)
mcr p15, 0, r0, c7, c7, 0 /* flush I+D cache */
RET
ENTRY(arm8_cache_flushID_E)
mcr p15, 0, r0, c7, c7, 1 /* flush I+D single entry */
RET
ENTRY(arm8_cache_cleanID)
mov r0, #0x00000000
1: mov r2, r0
mcr p15, 0, r2, c7, c11, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
adds r0, r0, #0x04000000
bne 1b
RET
ENTRY(arm8_cache_cleanID_E)
mcr p15, 0, r0, c7, c11, 1 /* clean I+D single entry */
RET
ENTRY(arm8_cache_purgeID)
/*
* ARM810 bug 3
*
* Clean and invalidate entry will not invalidate the entry
* if the line was already clean. (mcr p15, 0, rd, c7, 15, 1)
*
* Instead of using the clean and invalidate entry operation
* use a separate clean and invalidate entry operations.
* i.e.
* mcr p15, 0, rd, c7, c11, 1
* mcr p15, 0, rd, c7, c7, 1
*/
mov r0, #0x00000000
mrs r3, cpsr_all
orr r2, r3, #(I32_bit | F32_bit)
msr cpsr_all, r2
1: mov r2, r0
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
add r2, r2, #0x10
mcr p15, 0, r2, c7, c11, 1
mcr p15, 0, r2, c7, c7, 1
adds r0, r0, #0x04000000
bne 1b
msr cpsr_all, r3
RET
ENTRY(arm8_cache_purgeID_E)
/*
* ARM810 bug 3
*
* Clean and invalidate entry will not invalidate the entry
* if the line was already clean. (mcr p15, 0, rd, c7, 15, 1)
*
* Instead of using the clean and invalidate entry operation
* use a separate clean and invalidate entry operations.
* i.e.
* mcr p15, 0, rd, c7, c11, 1
* mcr p15, 0, rd, c7, c7, 1
*/
mrs r3, cpsr_all
orr r2, r3, #(I32_bit | F32_bit)
msr cpsr_all, r2
mcr p15, 0, r0, c7, c11, 1 /* clean I+D single entry */
mcr p15, 0, r0, c7, c7, 1 /* flush I+D single entry */
msr cpsr_all, r3
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
*/
ENTRY(arm8_context_switch)
/* For good measure we will flush the IDC as well */
mcr p15, 0, r0, c7, c7, 0 /* flush I+D cache */
/* 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 */
#if 0
/* For good measure we will flush the IDC as well */
mcr p15, 0, r0, c7, c7, 0 /* flush I+D cache */
#endif
/* Make sure that pipeline is emptied */
mov r0, r0
mov r0, r0
RET