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/* mmu-asm.S -- MMU handling 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.
*/
/* -------------------------------------------------------------------------- */
/*!Function to control MMU
*/
/* -------------------------------------------------------------------------- */
#include "include/or1k-asm.h"
#include "include/or1k-sprs.h"
/* MMU control functions always switch MMU control with a l.rfe to return
from function */
.section .text
.global or1k_dmmu_enable
or1k_dmmu_enable:
l.mfspr r3,r0,OR1K_SPR_SYS_SR_ADDR
l.ori r3,r3,OR1K_SPR_SYS_SR_DME_MASK
l.mtspr r0,r3,OR1K_SPR_SYS_ESR_BASE
l.mtspr r0,r9,OR1K_SPR_SYS_EPCR_BASE
OR1K_DELAYED_NOP(OR1K_INST(l.rfe))
.global or1k_dmmu_disable
or1k_dmmu_disable:
l.ori r3,r0,OR1K_SPR_SYS_SR_DME_MASK
l.xori r4,r3,0xffff
l.mfspr r3,r0,OR1K_SPR_SYS_SR_ADDR
l.and r3,r4,r3
l.mtspr r0,r3,OR1K_SPR_SYS_ESR_BASE
l.mtspr r0,r9,OR1K_SPR_SYS_EPCR_BASE
OR1K_DELAYED_NOP(OR1K_INST(l.rfe))
.global or1k_immu_enable
or1k_immu_enable:
l.mfspr r3,r0,OR1K_SPR_SYS_SR_ADDR
l.ori r3,r3,OR1K_SPR_SYS_SR_IME_MASK
l.mtspr r0,r3,OR1K_SPR_SYS_ESR_BASE
l.mtspr r0,r9,OR1K_SPR_SYS_EPCR_BASE
OR1K_DELAYED_NOP(OR1K_INST(l.rfe))
.global or1k_immu_disable
or1k_immu_disable:
l.ori r3,r0,OR1K_SPR_SYS_SR_IME_MASK
l.xori r4,r3,0xffff
l.mfspr r3,r0,OR1K_SPR_SYS_SR_ADDR
l.and r3,r4,r3
l.mtspr r0,r3,OR1K_SPR_SYS_ESR_BASE
l.mtspr r0,r9,OR1K_SPR_SYS_EPCR_BASE
OR1K_DELAYED_NOP(OR1K_INST(l.rfe))
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