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/* caches-asm.S -- cache manipulation for OpenRISC 1000.
*
* Copyright (c) 2011, 2014 Authors
*
* Contributor Julius Baxter <juliusbaxter@gmail.com>
* Contributor Stefan Wallentowitz <stefan.wallentowitz@tum.de>
*
* The authors hereby grant permission to use, copy, modify, distribute,
* and license this software and its documentation for any purpose, provided
* that existing copyright notices are retained in all copies and that this
* notice is included verbatim in any distributions. No written agreement,
* license, or royalty fee is required for any of the authorized uses.
* Modifications to this software may be copyrighted by their authors
* and need not follow the licensing terms described here, provided that
* the new terms are clearly indicated on the first page of each file where
* they apply.
*/
#include "include/or1k-asm.h"
#include "include/or1k-sprs.h"
/* -------------------------------------------------------------------------- */
/*!Function used at reset to clear and enable all caches
*/
/* -------------------------------------------------------------------------- */
.global _or1k_cache_init
.type _or1k_cache_init,@function
_or1k_cache_init:
/* Instruction cache enable */
/* Check if IC present and skip enabling otherwise */
l.mfspr r3,r0,OR1K_SPR_SYS_UPR_ADDR
l.andi r4,r3,OR1K_SPR_SYS_UPR_ICP_MASK
l.sfeq r4,r0
OR1K_DELAYED_NOP(OR1K_INST(l.bf .Lnoic))
/* Disable IC */
l.mfspr r6,r0,OR1K_SPR_SYS_SR_ADDR
l.addi r5,r0,-1
l.xori r5,r5,OR1K_SPR_SYS_SR_ICE_MASK
l.and r5,r6,r5
l.mtspr r0,r5,OR1K_SPR_SYS_SR_ADDR
/* Establish cache block size
If BS=0, 16;
If BS=1, 32;
r14 contain block size
*/
l.mfspr r3,r0,OR1K_SPR_SYS_ICCFGR_ADDR
l.andi r4,r3,OR1K_SPR_SYS_ICCFGR_CBS_MASK
l.srli r7,r4,7
l.ori r8,r0,16
l.sll r14,r8,r7
/* Establish number of cache sets
r13 contains number of cache sets
r7 contains log(# of cache sets)
*/
l.andi r4,r3,OR1K_SPR_SYS_ICCFGR_NCS_MASK
l.srli r7,r4,3
l.ori r8,r0,1
l.sll r13,r8,r7
/* Invalidate IC */
l.addi r6,r0,0
l.sll r5,r14,r7
.Linvi: l.mtspr r0,r6,OR1K_SPR_ICACHE_ICBIR_ADDR
l.sfne r6,r5
OR1K_DELAYED(
OR1K_INST(l.add r6,r6,r14),
OR1K_INST(l.bf .Linvi)
)
/* Enable IC */
l.mfspr r6,r0,OR1K_SPR_SYS_SR_ADDR
l.ori r6,r6,OR1K_SPR_SYS_SR_ICE_MASK
l.mtspr r0,r6,OR1K_SPR_SYS_SR_ADDR
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
/* Data cache enable */
/* Check if DC present and skip enabling otherwise */
.Lnoic: l.mfspr r3,r0,OR1K_SPR_SYS_UPR_ADDR
l.andi r4,r3,OR1K_SPR_SYS_UPR_DCP_MASK
l.sfeq r4,r0
OR1K_DELAYED_NOP(OR1K_INST(l.bf .Lnodc))
/* Disable DC */
l.mfspr r6,r0,OR1K_SPR_SYS_SR_ADDR
l.addi r5,r0,-1
l.xori r5,r5,OR1K_SPR_SYS_SR_DCE_MASK
l.and r5,r6,r5
l.mtspr r0,r5,OR1K_SPR_SYS_SR_ADDR
/* Establish cache block size
If BS=0, 16;
If BS=1, 32;
r14 contain block size */
l.mfspr r3,r0,OR1K_SPR_SYS_DCCFGR_ADDR
l.andi r4,r3,OR1K_SPR_SYS_DCCFGR_CBS_MASK
l.srli r7,r4,7
l.ori r8,r0,16
l.sll r14,r8,r7
/* Establish number of cache sets
r13 contains number of cache sets
r7 contains log(# of cache sets) */
l.andi r4,r3,OR1K_SPR_SYS_ICCFGR_NCS_MASK
l.srli r7,r4,3
l.ori r8,r0,1
l.sll r13,r8,r7
/* Invalidate DC */
l.addi r6,r0,0
l.sll r5,r14,r7
.Linvd: l.mtspr r0,r6,OR1K_SPR_DCACHE_DCBIR_ADDR
l.sfne r6,r5
OR1K_DELAYED(
OR1K_INST(l.add r6,r6,r14),
OR1K_INST(l.bf .Linvd)
)
/* Enable DC */
l.mfspr r6,r0,OR1K_SPR_SYS_SR_ADDR
l.ori r6,r6,OR1K_SPR_SYS_SR_DCE_MASK
l.mtspr r0,r6,OR1K_SPR_SYS_SR_ADDR
.Lnodc:
/* Return */
OR1K_DELAYED_NOP(OR1K_INST(l.jr r9))
/* -------------------------------------------------------------------------- */
/*!Function to enable instruction cache
*/
/* -------------------------------------------------------------------------- */
.global or1k_icache_enable
.type or1k_icache_enable,@function
or1k_icache_enable:
/* Enable IC */
l.mfspr r13,r0,OR1K_SPR_SYS_SR_ADDR
l.ori r13,r13,OR1K_SPR_SYS_SR_ICE_MASK
l.mtspr r0,r13,OR1K_SPR_SYS_SR_ADDR
l.nop
l.nop
l.nop
l.nop
l.nop
OR1K_DELAYED_NOP(OR1K_INST(l.jr r9))
/* -------------------------------------------------------------------------- */
/*!Function to disable instruction cache
*/
/* -------------------------------------------------------------------------- */
.global or1k_icache_disable
.type or1k_icache_disable,@function
or1k_icache_disable:
/* Disable IC */
l.mfspr r13,r0,OR1K_SPR_SYS_SR_ADDR
l.addi r12,r0,-1
l.xori r12,r12,OR1K_SPR_SYS_SR_ICE_MASK
l.and r12,r13,r12
l.mtspr r0,r12,OR1K_SPR_SYS_SR_ADDR
OR1K_DELAYED_NOP(OR1K_INST(l.jr r9))
/* -------------------------------------------------------------------------- */
/*!Function to flush address of instruction cache
*/
/* -------------------------------------------------------------------------- */
.global or1k_icache_flush
.type or1k_icache_flush,@function
or1k_icache_flush:
OR1K_DELAYED(
OR1K_INST(l.mtspr r0,r3,OR1K_SPR_ICACHE_ICBIR_ADDR),
/* Push r3 into IC invalidate reg */
OR1K_INST(l.jr r9)
)
/* -------------------------------------------------------------------------- */
/*!Function to enable data cache
*/
/* -------------------------------------------------------------------------- */
.global or1k_dcache_enable
.type or1k_dcache_enable,@function
or1k_dcache_enable:
/* Enable DC */
l.mfspr r13,r0,OR1K_SPR_SYS_SR_ADDR
l.ori r13,r13,OR1K_SPR_SYS_SR_DCE_MASK
l.mtspr r0,r13,OR1K_SPR_SYS_SR_ADDR
l.nop
l.nop
l.nop
l.nop
l.nop
OR1K_DELAYED_NOP(OR1K_INST(l.jr r9))
/* -------------------------------------------------------------------------- */
/*!Function to disable data cache
*/
/* -------------------------------------------------------------------------- */
.global or1k_dcache_disable
.type or1k_dcache_disable,@function
or1k_dcache_disable:
/* Disable DC */
l.mfspr r13,r0,OR1K_SPR_SYS_SR_ADDR
l.addi r12,r0,-1
l.xori r12,r12,OR1K_SPR_SYS_SR_DCE_MASK
l.and r12,r13,r12
l.mtspr r0,r12,OR1K_SPR_SYS_SR_ADDR
OR1K_DELAYED_NOP(OR1K_INST(l.jr r9))
/* -------------------------------------------------------------------------- */
/*!Function to flush address of data cache
*/
/* -------------------------------------------------------------------------- */
.global or1k_dcache_flush
.type or1k_dcache_flush,@function
or1k_dcache_flush:
OR1K_DELAYED(
OR1K_INST(l.mtspr r0,r3,OR1K_SPR_DCACHE_DCBIR_ADDR),
/* Push r3 into DC invalidate reg */
OR1K_INST(l.jr r9)
)
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