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    /or1k/tags/stable_0_2_0_rc3/or1ksim/mmu
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Rev 1648 → Rev 1765

/Makefile.in
0,0 → 1,420
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# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
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# Makefile -- Makefile for cpu architecture independent simulation
# Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
#
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#
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# Tell versions [3.59,3.63) of GNU make to not export all variables.
# Otherwise a system limit (for SysV at least) may be exceeded.
.NOEXPORT:
/dmmu.c
0,0 → 1,377
/* dmmu.c -- Data MMU simulation
Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
This file is part of OpenRISC 1000 Architectural Simulator.
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
 
/* DMMU model, perfectly functional. */
 
#include "config.h"
 
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif
 
#include "port.h"
#include "arch.h"
#include "dmmu.h"
#include "abstract.h"
#include "opcode/or32.h"
#include "spr_defs.h"
#include "execute.h"
#include "stats.h"
#include "sprs.h"
#include "except.h"
#include "sim-config.h"
#include "debug.h"
#include "misc.h"
 
DEFAULT_DEBUG_CHANNEL(dmmu);
 
/* Data MMU */
 
/* Precalculates some values for use during address translation */
void init_dmmu(void)
{
config.dmmu.pagesize_log2 = log2_int(config.dmmu.pagesize);
config.dmmu.page_offset_mask = config.dmmu.pagesize - 1;
config.dmmu.page_mask = ~config.dmmu.page_offset_mask;
config.dmmu.vpn_mask = ~((config.dmmu.pagesize * config.dmmu.nsets) - 1);
config.dmmu.set_mask = config.dmmu.nsets - 1;
config.dmmu.lru_reload = (config.dmmu.set_mask << 6) & SPR_DTLBMR_LRU;
}
 
inline uorreg_t *dmmu_find_tlbmr(oraddr_t virtaddr, uorreg_t **dtlbmr_lru)
{
int set;
int i;
oraddr_t vpn;
uorreg_t *dtlbmr;
 
/* Which set to check out? */
set = DADDR_PAGE(virtaddr) >> config.dmmu.pagesize_log2;
set &= config.dmmu.set_mask;
vpn = virtaddr & config.dmmu.vpn_mask;
 
dtlbmr = &cpu_state.sprs[SPR_DTLBMR_BASE(0) + set];
*dtlbmr_lru = dtlbmr;
 
/* FIXME: Should this be reversed? */
for(i = config.dmmu.nways; i; i--, dtlbmr += (128 * 2)) {
if(((*dtlbmr & config.dmmu.vpn_mask) == vpn) && (*dtlbmr & SPR_DTLBMR_V))
return dtlbmr;
}
 
return NULL;
}
 
oraddr_t dmmu_translate(oraddr_t virtaddr, int write_access)
{
int i;
uorreg_t *dtlbmr;
uorreg_t *dtlbtr;
uorreg_t *dtlbmr_lru;
 
if (!(cpu_state.sprs[SPR_SR] & SPR_SR_DME) ||
!(cpu_state.sprs[SPR_UPR] & SPR_UPR_DMP)) {
data_ci = (virtaddr >= 0x80000000);
return virtaddr;
}
 
dtlbmr = dmmu_find_tlbmr(virtaddr, &dtlbmr_lru);
 
/* Did we find our tlb entry? */
if(dtlbmr) { /* Yes, we did. */
dmmu_stats.loads_tlbhit++;
 
dtlbtr = dtlbmr + 128;
TRACE("DTLB hit (virtaddr=%"PRIxADDR") at %lli.\n", virtaddr,
runtime.sim.cycles);
/* Set LRUs */
for(i = 0; i < config.dmmu.nways; i++, dtlbmr_lru += (128 * 2)) {
if(*dtlbmr_lru & SPR_DTLBMR_LRU)
*dtlbmr_lru = (*dtlbmr_lru & ~SPR_DTLBMR_LRU) |
((*dtlbmr_lru & SPR_DTLBMR_LRU) - 0x40);
}
 
/* This is not necessary `*dtlbmr &= ~SPR_DTLBMR_LRU;' since SPR_DTLBMR_LRU
* is always decremented and the number of sets is always a power of two and
* as such lru_reload has all bits set that get touched during decrementing
* SPR_DTLBMR_LRU */
*dtlbmr |= config.dmmu.lru_reload;
 
/* Check if page is cache inhibited */
data_ci = *dtlbtr & SPR_DTLBTR_CI;
 
runtime.sim.mem_cycles += config.dmmu.hitdelay;
 
/* Test for page fault */
if (cpu_state.sprs[SPR_SR] & SPR_SR_SM) {
if ( (write_access && !(*dtlbtr & SPR_DTLBTR_SWE))
|| (!write_access && !(*dtlbtr & SPR_DTLBTR_SRE)))
except_handle(EXCEPT_DPF, virtaddr);
} else {
if ( (write_access && !(*dtlbtr & SPR_DTLBTR_UWE))
|| (!write_access && !(*dtlbtr & SPR_DTLBTR_URE)))
except_handle(EXCEPT_DPF, virtaddr);
}
 
TRACE("Returning physical address %"PRIxADDR"\n",
(*dtlbtr & SPR_DTLBTR_PPN) | (virtaddr &
(config.dmmu.page_offset_mask)));
return (*dtlbtr & SPR_DTLBTR_PPN) | (virtaddr &
(config.dmmu.page_offset_mask));
}
 
/* No, we didn't. */
dmmu_stats.loads_tlbmiss++;
#if 0
for (i = 0; i < config.dmmu.nways; i++)
if (((cpu_state.sprs[SPR_DTLBMR_BASE(i) + set] & SPR_DTLBMR_LRU) >> 6) < minlru)
minway = i;
cpu_state.sprs[SPR_DTLBMR_BASE(minway) + set] &= ~SPR_DTLBMR_VPN;
cpu_state.sprs[SPR_DTLBMR_BASE(minway) + set] |= vpn << 12;
for (i = 0; i < config.dmmu.nways; i++) {
uorreg_t lru = cpu_state.sprs[SPR_DTLBMR_BASE(i) + set];
if (lru & SPR_DTLBMR_LRU) {
lru = (lru & ~SPR_DTLBMR_LRU) | ((lru & SPR_DTLBMR_LRU) - 0x40);
cpu_state.sprs[SPR_DTLBMR_BASE(i) + set] = lru;
}
}
cpu_state.sprs[SPR_DTLBMR_BASE(way) + set] &= ~SPR_DTLBMR_LRU;
cpu_state.sprs[SPR_DTLBMR_BASE(way) + set] |= (config.dmmu.nsets - 1) << 6;
 
/* 1 to 1 mapping */
cpu_state.sprs[SPR_DTLBTR_BASE(minway) + set] &= ~SPR_DTLBTR_PPN;
cpu_state.sprs[SPR_DTLBTR_BASE(minway) + set] |= vpn << 12;
 
cpu_state.sprs[SPR_DTLBMR_BASE(minway) + set] |= SPR_DTLBMR_V;
#endif
TRACE("DTLB miss (virtaddr=%"PRIxADDR") at %lli.\n", virtaddr,
runtime.sim.cycles);
runtime.sim.mem_cycles += config.dmmu.missdelay;
/* if tlb refill implemented in HW */
/* return ((cpu_state.sprs[SPR_DTLBTR_BASE(minway) + set] & SPR_DTLBTR_PPN) >> 12) * config.dmmu.pagesize + (virtaddr % config.dmmu.pagesize); */
 
except_handle(EXCEPT_DTLBMISS, virtaddr);
return 0;
}
 
/* DESC: try to find EA -> PA transaltion without changing
* any of precessor states. if this is not passible gives up
* (without triggering exceptions)
*
* PRMS: virtaddr - EA for which to find translation
*
* write_access - 0 ignore testing for write access
* 1 test for write access, if fails
* do not return translation
*
* through_dc - 1 go through data cache
* 0 ignore data cache
*
* RTRN: 0 - no DMMU, DMMU disabled or ITLB miss
* else - appropriate PA (note it DMMU is not present
* PA === EA)
*/
oraddr_t peek_into_dtlb(oraddr_t virtaddr, int write_access, int through_dc)
{
uorreg_t *dtlbmr;
uorreg_t *dtlbtr;
uorreg_t *dtlbmr_lru;
 
if (!(cpu_state.sprs[SPR_SR] & SPR_SR_DME) ||
!(cpu_state.sprs[SPR_UPR] & SPR_UPR_DMP)) {
if (through_dc)
data_ci = (virtaddr >= 0x80000000);
return virtaddr;
}
 
dtlbmr = dmmu_find_tlbmr(virtaddr, &dtlbmr_lru);
 
/* Did we find our tlb entry? */
if (dtlbmr) { /* Yes, we did. */
dmmu_stats.loads_tlbhit++;
 
dtlbtr = dtlbmr + 128;
TRACE("DTLB hit (virtaddr=%"PRIxADDR") at %lli.\n", virtaddr,
runtime.sim.cycles);
/* Test for page fault */
if (cpu_state.sprs[SPR_SR] & SPR_SR_SM) {
if((write_access && !(*dtlbtr & SPR_DTLBTR_SWE)) ||
(!write_access && !(*dtlbtr & SPR_DTLBTR_SRE)))
/* otherwise exception DPF would be raised */
return(0);
} else {
if((write_access && !(*dtlbtr & SPR_DTLBTR_UWE)) ||
(!write_access && !(*dtlbtr & SPR_DTLBTR_URE)))
/* otherwise exception DPF would be raised */
return(0);
}
 
if (through_dc) {
/* Check if page is cache inhibited */
data_ci = *dtlbtr & SPR_DTLBTR_CI;
}
 
return (*dtlbtr & SPR_DTLBTR_PPN) | (virtaddr &
(config.dmmu.page_offset_mask));
}
 
return(0);
}
 
 
void dtlb_info(void)
{
if (!(cpu_state.sprs[SPR_UPR] & SPR_UPR_DMP)) {
PRINTF("DMMU not implemented. Set UPR[DMP].\n");
return;
}
PRINTF("Data MMU %dKB: ", config.dmmu.nsets * config.dmmu.entrysize * config.dmmu.nways / 1024);
PRINTF("%d ways, %d sets, entry size %d bytes\n", config.dmmu.nways, config.dmmu.nsets, config.dmmu.entrysize);
}
 
/* First check if virtual address is covered by DTLB and if it is:
- increment DTLB read hit stats,
- set 'lru' at this way to config.dmmu.ustates - 1 and
decrement 'lru' of other ways unless they have reached 0,
- check page access attributes and invoke DMMU page fault exception
handler if necessary
and if not:
- increment DTLB read miss stats
- find lru way and entry and invoke DTLB miss exception handler
- set 'lru' with config.dmmu.ustates - 1 and decrement 'lru' of other
ways unless they have reached 0
*/
 
void dtlb_status(int start_set)
{
int set;
int way;
int end_set = config.dmmu.nsets;
 
if (!(cpu_state.sprs[SPR_UPR] & SPR_UPR_DMP)) {
PRINTF("DMMU not implemented. Set UPR[DMP].\n");
return;
}
 
if ((start_set >= 0) && (start_set < end_set))
end_set = start_set + 1;
else
start_set = 0;
 
if (start_set < end_set) PRINTF("\nDMMU: ");
/* Scan set(s) and way(s). */
for (set = start_set; set < end_set; set++) {
PRINTF("\nSet %x: ", set);
for (way = 0; way < config.dmmu.nways; way++) {
PRINTF(" way %d: ", way);
PRINTF("%s\n", dump_spr(SPR_DTLBMR_BASE(way) + set,
cpu_state.sprs[SPR_DTLBMR_BASE(way) + set]));
PRINTF("%s\n", dump_spr(SPR_DTLBTR_BASE(way) + set,
cpu_state.sprs[SPR_DTLBTR_BASE(way) + set]));
}
}
if (start_set < end_set) PRINTF("\n");
}
 
/*---------------------------------------------------[ DMMU configuration ]---*/
void dmmu_enabled(union param_val val, void *dat)
{
if(val.int_val)
cpu_state.sprs[SPR_UPR] |= SPR_UPR_DMP;
else
cpu_state.sprs[SPR_UPR] &= ~SPR_UPR_DMP;
config.dmmu.enabled = val.int_val;
}
 
void dmmu_nsets(union param_val val, void *dat)
{
if (is_power2(val.int_val) && val.int_val <= 256) {
config.dmmu.nsets = val.int_val;
cpu_state.sprs[SPR_DMMUCFGR] &= ~SPR_DMMUCFGR_NTS;
cpu_state.sprs[SPR_DMMUCFGR] |= log2_int(val.int_val) << 3;
} else
CONFIG_ERROR("value of power of two and lower or equal than 256 expected.");
}
 
void dmmu_nways(union param_val val, void *dat)
{
if (val.int_val >= 1 && val.int_val <= 4) {
config.dmmu.nways = val.int_val;
cpu_state.sprs[SPR_DMMUCFGR] &= ~SPR_DMMUCFGR_NTW;
cpu_state.sprs[SPR_DMMUCFGR] |= val.int_val - 1;
}
else
CONFIG_ERROR("value 1, 2, 3 or 4 expected.");
}
 
void dmmu_pagesize(union param_val val, void *dat)
{
if (is_power2(val.int_val))
config.dmmu.pagesize = val.int_val;
else
CONFIG_ERROR("value of power of two expected.");
}
 
void dmmu_entrysize(union param_val val, void *dat)
{
if (is_power2(val.int_val))
config.dmmu.entrysize = val.int_val;
else
CONFIG_ERROR("value of power of two expected.");
}
 
void dmmu_ustates(union param_val val, void *dat)
{
if (val.int_val >= 2 && val.int_val <= 4)
config.dmmu.ustates = val.int_val;
else
CONFIG_ERROR("invalid USTATE.");
}
 
void dmmu_missdelay(union param_val val, void *dat)
{
config.dmmu.missdelay = val.int_val;
}
 
void dmmu_hitdelay(union param_val val, void *dat)
{
config.immu.hitdelay = val.int_val;
}
 
void reg_dmmu_sec(void)
{
struct config_section *sec = reg_config_sec("dmmu", NULL, NULL);
 
reg_config_param(sec, "enabled", paramt_int, dmmu_enabled);
reg_config_param(sec, "nsets", paramt_int, dmmu_nsets);
reg_config_param(sec, "nways", paramt_int, dmmu_nways);
reg_config_param(sec, "pagesize", paramt_int, dmmu_pagesize);
reg_config_param(sec, "entrysize", paramt_int, dmmu_entrysize);
reg_config_param(sec, "ustates", paramt_int, dmmu_ustates);
reg_config_param(sec, "missdelay", paramt_int, dmmu_missdelay);
reg_config_param(sec, "hitdelay", paramt_int, dmmu_hitdelay);
}
/immu.c
0,0 → 1,353
/* immu.c -- Instruction MMU simulation
Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
This file is part of OpenRISC 1000 Architectural Simulator.
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
 
/* IMMU model, perfectly functional. */
 
#include "config.h"
 
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif
 
#include "port.h"
#include "arch.h"
#include "immu.h"
#include "abstract.h"
#include "opcode/or32.h"
#include "spr_defs.h"
#include "execute.h"
#include "stats.h"
#include "sprs.h"
#include "except.h"
#include "sim-config.h"
#include "debug.h"
#include "misc.h"
 
DEFAULT_DEBUG_CHANNEL(immu);
 
/* Insn MMU */
 
/* Precalculates some values for use during address translation */
void init_immu(void)
{
config.immu.pagesize_log2 = log2_int(config.immu.pagesize);
config.immu.page_offset_mask = config.immu.pagesize - 1;
config.immu.page_mask = ~config.immu.page_offset_mask;
config.immu.vpn_mask = ~((config.immu.pagesize * config.immu.nsets) - 1);
config.immu.set_mask = config.immu.nsets - 1;
config.immu.lru_reload = (config.immu.set_mask << 6) & SPR_ITLBMR_LRU;
}
 
inline uorreg_t *immu_find_tlbmr(oraddr_t virtaddr, uorreg_t **itlbmr_lru)
{
int set;
int i;
oraddr_t vpn;
uorreg_t *itlbmr;
 
/* Which set to check out? */
set = IADDR_PAGE(virtaddr) >> config.immu.pagesize_log2;
set &= config.immu.set_mask;
vpn = virtaddr & config.immu.vpn_mask;
 
itlbmr = &cpu_state.sprs[SPR_ITLBMR_BASE(0) + set];
*itlbmr_lru = itlbmr;
 
/* Scan all ways and try to find a matching way. */
/* FIXME: Should this be reversed? */
for(i = config.immu.nways; i; i--, itlbmr += (128 * 2)) {
if(((*itlbmr & config.immu.vpn_mask) == vpn) && (*itlbmr & SPR_ITLBMR_V))
return itlbmr;
}
 
return NULL;
}
 
oraddr_t immu_translate(oraddr_t virtaddr)
{
int i;
uorreg_t *itlbmr;
uorreg_t *itlbtr;
uorreg_t *itlbmr_lru;
 
if (!(cpu_state.sprs[SPR_SR] & SPR_SR_IME) ||
!(cpu_state.sprs[SPR_UPR] & SPR_UPR_IMP)) {
insn_ci = (virtaddr >= 0x80000000);
return virtaddr;
}
 
itlbmr = immu_find_tlbmr(virtaddr, &itlbmr_lru);
 
/* Did we find our tlb entry? */
if(itlbmr) { /* Yes, we did. */
immu_stats.fetch_tlbhit++;
TRACE("ITLB hit (virtaddr=%"PRIxADDR").\n", virtaddr);
itlbtr = itlbmr + 128;
/* Set LRUs */
for(i = 0; i < config.immu.nways; i++, itlbmr_lru += (128 * 2)) {
if(*itlbmr_lru & SPR_ITLBMR_LRU)
*itlbmr_lru = (*itlbmr_lru & ~SPR_ITLBMR_LRU) |
((*itlbmr_lru & SPR_ITLBMR_LRU) - 0x40);
}
 
/* This is not necessary `*itlbmr &= ~SPR_ITLBMR_LRU;' since SPR_DTLBMR_LRU
* is always decremented and the number of sets is always a power of two and
* as such lru_reload has all bits set that get touched during decrementing
* SPR_DTLBMR_LRU */
*itlbmr |= config.immu.lru_reload;
 
/* Check if page is cache inhibited */
insn_ci = *itlbtr & SPR_ITLBTR_CI;
 
runtime.sim.mem_cycles += config.immu.hitdelay;
 
/* Test for page fault */
if (cpu_state.sprs[SPR_SR] & SPR_SR_SM) {
if (!(*itlbtr & SPR_ITLBTR_SXE))
except_handle(EXCEPT_IPF, virtaddr);
} else {
if (!(*itlbtr & SPR_ITLBTR_UXE))
except_handle(EXCEPT_IPF, virtaddr);
}
 
TRACE("Returning physical address %"PRIxADDR"\n",
(*itlbtr & SPR_ITLBTR_PPN) | (virtaddr &
(config.immu.page_offset_mask)));
return (*itlbtr & SPR_ITLBTR_PPN) | (virtaddr &
(config.immu.page_offset_mask));
}
 
/* No, we didn't. */
immu_stats.fetch_tlbmiss++;
#if 0
for (i = 0; i < config.immu.nways; i++)
if (((cpu_state.sprs[SPR_ITLBMR_BASE(i) + set] & SPR_ITLBMR_LRU) >> 6) < minlru)
minway = i;
cpu_state.sprs[SPR_ITLBMR_BASE(minway) + set] &= ~SPR_ITLBMR_VPN;
cpu_state.sprs[SPR_ITLBMR_BASE(minway) + set] |= vpn << 12;
for (i = 0; i < config.immu.nways; i++) {
uorreg_t lru = cpu_state.sprs[SPR_ITLBMR_BASE(i) + set];
if (lru & SPR_ITLBMR_LRU) {
lru = (lru & ~SPR_ITLBMR_LRU) | ((lru & SPR_ITLBMR_LRU) - 0x40);
cpu_state.sprs[SPR_ITLBMR_BASE(i) + set] = lru;
}
}
cpu_state.sprs[SPR_ITLBMR_BASE(way) + set] &= ~SPR_ITLBMR_LRU;
cpu_state.sprs[SPR_ITLBMR_BASE(way) + set] |= (config.immu.nsets - 1) << 6;
 
/* 1 to 1 mapping */
cpu_state.sprs[SPR_ITLBTR_BASE(minway) + set] &= ~SPR_ITLBTR_PPN;
cpu_state.sprs[SPR_ITLBTR_BASE(minway) + set] |= vpn << 12;
 
cpu_state.sprs[SPR_ITLBMR_BASE(minway) + set] |= SPR_ITLBMR_V;
#endif
 
/* if tlb refill implemented in HW */
/* return ((cpu_state.sprs[SPR_ITLBTR_BASE(minway) + set] & SPR_ITLBTR_PPN) >> 12) * config.immu.pagesize + (virtaddr % config.immu.pagesize); */
runtime.sim.mem_cycles += config.immu.missdelay;
 
except_handle(EXCEPT_ITLBMISS, virtaddr);
return 0;
}
 
/* DESC: try to find EA -> PA transaltion without changing
* any of precessor states. if this is not passible gives up
* (without triggering exceptions).
*
* PRMS: virtaddr - EA for which to find translation
*
* RTRN: 0 - no IMMU, IMMU disabled or ITLB miss
* else - appropriate PA (note it IMMU is not present
* PA === EA)
*/
oraddr_t peek_into_itlb(oraddr_t virtaddr)
{
uorreg_t *itlbmr;
uorreg_t *itlbtr;
uorreg_t *itlbmr_lru;
 
if (!(cpu_state.sprs[SPR_SR] & SPR_SR_IME) ||
!(cpu_state.sprs[SPR_UPR] & SPR_UPR_IMP)) {
return(virtaddr);
}
 
itlbmr = immu_find_tlbmr(virtaddr, &itlbmr_lru);
 
/* Did we find our tlb entry? */
if(itlbmr) { /* Yes, we did. */
itlbtr = itlbmr + 128;
 
/* Test for page fault */
if (cpu_state.sprs[SPR_SR] & SPR_SR_SM) {
if (!(*itlbtr & SPR_ITLBTR_SXE)) {
/* no luck, giving up */
return(0);
}
} else {
if (!(*itlbtr & SPR_ITLBTR_UXE)) {
/* no luck, giving up */
return(0);
}
}
 
return (*itlbtr & SPR_ITLBTR_PPN) | (virtaddr &
(config.immu.page_offset_mask));
}
 
return(0);
}
 
 
void itlb_info(void)
{
if (!(cpu_state.sprs[SPR_UPR] & SPR_UPR_IMP)) {
PRINTF("IMMU not implemented. Set UPR[IMP].\n");
return;
}
 
PRINTF("Insn MMU %dKB: ", config.immu.nsets * config.immu.entrysize * config.immu.nways / 1024);
PRINTF("%d ways, %d sets, entry size %d bytes\n", config.immu.nways, config.immu.nsets, config.immu.entrysize);
}
 
/* First check if virtual address is covered by ITLB and if it is:
- increment ITLB read hit stats,
- set 'lru' at this way to config.immu.ustates - 1 and
decrement 'lru' of other ways unless they have reached 0,
- check page access attributes and invoke IMMU page fault exception
handler if necessary
and if not:
- increment ITLB read miss stats
- find lru way and entry and invoke ITLB miss exception handler
- set 'lru' with config.immu.ustates - 1 and decrement 'lru' of other
ways unless they have reached 0
*/
 
void itlb_status(int start_set)
{
int set;
int way;
int end_set = config.immu.nsets;
 
if (!(cpu_state.sprs[SPR_UPR] & SPR_UPR_IMP)) {
PRINTF("IMMU not implemented. Set UPR[IMP].\n");
return;
}
 
if ((start_set >= 0) && (start_set < end_set))
end_set = start_set + 1;
else
start_set = 0;
 
if (start_set < end_set) PRINTF("\nIMMU: ");
/* Scan set(s) and way(s). */
for (set = start_set; set < end_set; set++) {
PRINTF("\nSet %x: ", set);
for (way = 0; way < config.immu.nways; way++) {
PRINTF(" way %d: ", way);
PRINTF("%s\n", dump_spr(SPR_ITLBMR_BASE(way) + set,
cpu_state.sprs[SPR_ITLBMR_BASE(way) + set]));
PRINTF("%s\n", dump_spr(SPR_ITLBTR_BASE(way) + set,
cpu_state.sprs[SPR_ITLBTR_BASE(way) + set]));
}
}
if (start_set < end_set) PRINTF("\n");
}
 
/*---------------------------------------------------[ IMMU configuration ]---*/
void immu_enabled(union param_val val, void *dat)
{
if(val.int_val)
cpu_state.sprs[SPR_UPR] |= SPR_UPR_IMP;
else
cpu_state.sprs[SPR_UPR] &= ~SPR_UPR_IMP;
config.immu.enabled = val.int_val;
}
 
void immu_nsets(union param_val val, void *dat)
{
if (is_power2(val.int_val) && val.int_val <= 256) {
config.immu.nsets = val.int_val;
cpu_state.sprs[SPR_IMMUCFGR] &= ~SPR_IMMUCFGR_NTS;
cpu_state.sprs[SPR_IMMUCFGR] |= log2_int(val.int_val) << 3;
}
else
CONFIG_ERROR("value of power of two and lower or equal than 256 expected.");
}
 
void immu_nways(union param_val val, void *dat)
{
if (val.int_val >= 1 && val.int_val <= 4) {
config.immu.nways = val.int_val;
cpu_state.sprs[SPR_IMMUCFGR] &= ~SPR_IMMUCFGR_NTW;
cpu_state.sprs[SPR_IMMUCFGR] |= val.int_val - 1;
}
else
CONFIG_ERROR("value 1, 2, 3 or 4 expected.");
}
 
void immu_pagesize(union param_val val, void *dat)
{
if (is_power2(val.int_val))
config.immu.pagesize = val.int_val;
else
CONFIG_ERROR("value of power of two expected.");
}
 
void immu_entrysize(union param_val val, void *dat)
{
if (is_power2(val.int_val))
config.immu.entrysize = val.int_val;
else
CONFIG_ERROR("value of power of two expected.");
}
 
void immu_ustates(union param_val val, void *dat)
{
if (val.int_val >= 2 && val.int_val <= 4)
config.immu.ustates = val.int_val;
else
CONFIG_ERROR("invalid USTATE.");
}
 
void immu_missdelay(union param_val val, void *dat)
{
config.immu.missdelay = val.int_val;
}
 
void immu_hitdelay(union param_val val, void *dat)
{
config.immu.hitdelay = val.int_val;
}
 
void reg_immu_sec(void)
{
struct config_section *sec = reg_config_sec("immu", NULL, NULL);
 
reg_config_param(sec, "enabled", paramt_int, immu_enabled);
reg_config_param(sec, "nsets", paramt_int, immu_nsets);
reg_config_param(sec, "nways", paramt_int, immu_nways);
reg_config_param(sec, "pagesize", paramt_int, immu_pagesize);
reg_config_param(sec, "entrysize", paramt_int, immu_entrysize);
reg_config_param(sec, "ustates", paramt_int, immu_ustates);
reg_config_param(sec, "missdelay", paramt_int, immu_missdelay);
reg_config_param(sec, "hitdelay", paramt_int, immu_hitdelay);
}
/dmmu.h
0,0 → 1,24
/* dmmu.h -- Data MMU header file
Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
This file is part of OpenRISC 1000 Architectural Simulator.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
oraddr_t dmmu_translate(oraddr_t virtaddr, int write_access);
oraddr_t dmmu_simulate_tlb(oraddr_t virtaddr, int write_access);
oraddr_t peek_into_dtlb(oraddr_t virtaddr, int write_access, int through_dc);
void dtlb_status(int start_set);
void init_dmmu(void);
/immu.h
0,0 → 1,24
/* immu.h -- Instruction MMU header file
Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
This file is part of OpenRISC 1000 Architectural Simulator.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
 
oraddr_t immu_translate(oraddr_t virtaddr);
oraddr_t immu_simulate_tlb(oraddr_t virtaddr);
oraddr_t peek_into_itlb(oraddr_t virtaddr);
void itlb_status(int start_set);
void init_immu(void);
/Makefile.am
0,0 → 1,23
# Makefile -- Makefile for cpu architecture independent simulation
# Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
#
# This file is part of OpenRISC 1000 Architectural Simulator.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
 
noinst_LIBRARIES = libmmu.a
libmmu_a_SOURCES = dmmu.c immu.c
 
/.
. Property changes : Added: svn:ignore ## -0,0 +1,2 ## +Makefile +.deps

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