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Line 22... |
#include "immu.h"
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#include "immu.h"
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#include "abstract.h"
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#include "abstract.h"
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#include "stats.h"
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#include "stats.h"
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#include "sprs.h"
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#include "sprs.h"
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#include "except.h"
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#include "except.h"
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#include "sim-config.h"
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extern int cont_run;
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extern int cont_run;
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/* Insn MMU */
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/* Insn MMU */
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Line 36... |
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/* printf("IMMU translate(%x) = %x\n", virtaddr, phyaddr);*/
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/* printf("IMMU translate(%x) = %x\n", virtaddr, phyaddr);*/
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return phyaddr;
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return phyaddr;
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}
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}
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/* Number of ITLB sets used (power of 2, max is 256) */
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#define ITLB_SETS 16
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/* Entry size in bytes (8 == two singlewords) */
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#define ITLB_ENTRY_SIZE 8
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/* Number of ITLB ways (1, 2, 3 etc., max is 4). */
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#define ITLB_WAYS 2
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/* Number of usage states (2, 3, 4 etc., max is 4). */
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#define ITLB_USTATES 2
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void itlb_info()
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void itlb_info()
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{
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{
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if (!testsprbits(SPR_UPR, SPR_UPR_IMP)) {
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if (!testsprbits(SPR_UPR, SPR_UPR_IMP)) {
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printf("IMMU not implemented. Set UPR[IMP].\n");
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printf("IMMU not implemented. Set UPR[IMP].\n");
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return;
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return;
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}
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}
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printf("Insn MMU %dKB: ", ITLB_SETS * ITLB_ENTRY_SIZE * ITLB_WAYS / 1024);
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printf("Insn MMU %dKB: ", config.immu.nsets * config.immu.entrysize * config.immu.nways / 1024);
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printf("%d ways, %d sets, entry size %d bytes\n", ITLB_WAYS, ITLB_SETS, ITLB_ENTRY_SIZE);
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printf("%d ways, %d sets, entry size %d bytes\n", config.immu.nways, config.immu.nsets, config.immu.entrysize);
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}
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}
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/* First check if virtual address is covered by ITLB and if it is:
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/* First check if virtual address is covered by ITLB and if it is:
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- increment ITLB read hit stats,
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- increment ITLB read hit stats,
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- set 'lru' at this way to ITLB_USTATES - 1 and
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- set 'lru' at this way to config.immu.ustates - 1 and
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decrement 'lru' of other ways unless they have reached 0,
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decrement 'lru' of other ways unless they have reached 0,
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- check page access attributes and invoke IMMU page fault exception
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- check page access attributes and invoke IMMU page fault exception
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handler if necessary
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handler if necessary
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and if not:
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and if not:
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- increment ITLB read miss stats
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- increment ITLB read miss stats
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- find lru way and entry and invoke ITLB miss exception handler
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- find lru way and entry and invoke ITLB miss exception handler
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- set 'lru' with ITLB_USTATES - 1 and decrement 'lru' of other
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- set 'lru' with config.immu.ustates - 1 and decrement 'lru' of other
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ways unless they have reached 0
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ways unless they have reached 0
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*/
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*/
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void itlb_status(int start_set)
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void itlb_status(int start_set)
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{
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{
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int set;
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int set;
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int way;
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int way;
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int end_set = ITLB_SETS;
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int end_set = config.immu.nsets;
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if (!testsprbits(SPR_UPR, SPR_UPR_IMP)) {
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if (!testsprbits(SPR_UPR, SPR_UPR_IMP)) {
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printf("IMMU not implemented. Set UPR[IMP].\n");
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printf("IMMU not implemented. Set UPR[IMP].\n");
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return;
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return;
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}
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}
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Line 80... |
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printf("\nIMMU: ");
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printf("\nIMMU: ");
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/* Scan set(s) and way(s). */
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/* Scan set(s) and way(s). */
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for (set = start_set; set < end_set; set++) {
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for (set = start_set; set < end_set; set++) {
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printf("\nSet %x: ", set);
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printf("\nSet %x: ", set);
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for (way = 0; way < ITLB_WAYS; way++) {
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for (way = 0; way < config.immu.nways; way++) {
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printf(" way %d: ", way);
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printf(" way %d: ", way);
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printf("vpn=%x ", getsprbits(SPR_ITLBMR_BASE(way) + set, SPR_ITLBMR_VPN));
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printf("vpn=%x ", getsprbits(SPR_ITLBMR_BASE(way) + set, SPR_ITLBMR_VPN));
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printf("lru=%x ", getsprbits(SPR_ITLBMR_BASE(way) + set, SPR_ITLBMR_LRU));
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printf("lru=%x ", getsprbits(SPR_ITLBMR_BASE(way) + set, SPR_ITLBMR_LRU));
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printf("pl1=%x ", getsprbits(SPR_ITLBMR_BASE(way) + set, SPR_ITLBMR_PL1));
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printf("pl1=%x ", getsprbits(SPR_ITLBMR_BASE(way) + set, SPR_ITLBMR_PL1));
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printf("v=%x ", getsprbits(SPR_ITLBMR_BASE(way) + set, SPR_ITLBMR_V));
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printf("v=%x ", getsprbits(SPR_ITLBMR_BASE(way) + set, SPR_ITLBMR_V));
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Line 110... |
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if (!(mfspr(SPR_SR) & SPR_SR_IME) || !(testsprbits(SPR_UPR, SPR_UPR_IMP)))
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if (!(mfspr(SPR_SR) & SPR_SR_IME) || !(testsprbits(SPR_UPR, SPR_UPR_IMP)))
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return virtaddr;
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return virtaddr;
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/* Which set to check out? */
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/* Which set to check out? */
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set = (virtaddr / PAGE_SIZE) % ITLB_SETS;
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set = (virtaddr / config.immu.pagesize) % config.immu.nsets;
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tagaddr = (virtaddr / PAGE_SIZE) / ITLB_SETS;
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tagaddr = (virtaddr / config.immu.pagesize) / config.immu.nsets;
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vpn = virtaddr / PAGE_SIZE;
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vpn = virtaddr / config.immu.pagesize;
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/* Scan all ways and try to find a matching way. */
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/* Scan all ways and try to find a matching way. */
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for (i = 0; i < ITLB_WAYS; i++)
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for (i = 0; i < config.immu.nways; i++)
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if ((getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_VPN) == vpn) &&
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if ((getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_VPN) == vpn) &&
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testsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_V))
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testsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_V))
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way = i;
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way = i;
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/* Did we find our tlb entry? */
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/* Did we find our tlb entry? */
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if (way >= 0) { /* Yes, we did. */
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if (way >= 0) { /* Yes, we did. */
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immu_stats.fetch_tlbhit++;
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immu_stats.fetch_tlbhit++;
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debug(5, "ITLB hit (virtaddr=%x).\n", virtaddr);
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debug(5, "ITLB hit (virtaddr=%x).\n", virtaddr);
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/* Set LRUs */
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/* Set LRUs */
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for (i = 0; i < ITLB_WAYS; i++)
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for (i = 0; i < config.immu.nways; i++)
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if (testsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU))
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if (testsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU))
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setsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU, getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU) - 1);
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setsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU, getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU) - 1);
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setsprbits(SPR_ITLBMR_BASE(way) + set, SPR_ITLBMR_LRU, ITLB_USTATES - 1);
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setsprbits(SPR_ITLBMR_BASE(way) + set, SPR_ITLBMR_LRU, config.immu.ustates - 1);
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return getsprbits(SPR_ITLBTR_BASE(way) + set, SPR_ITLBTR_PPN) * PAGE_SIZE + (virtaddr % PAGE_SIZE);
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return getsprbits(SPR_ITLBTR_BASE(way) + set, SPR_ITLBTR_PPN) * config.immu.pagesize + (virtaddr % config.immu.pagesize);
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}
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}
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else { /* No, we didn't. */
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else { /* No, we didn't. */
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int minlru = ITLB_USTATES - 1;
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int minlru = config.immu.ustates - 1;
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int minway = 0;
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int minway = 0;
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immu_stats.fetch_tlbmiss++;
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immu_stats.fetch_tlbmiss++;
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#if 0
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#if 0
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for (i = 0; i < ITLB_WAYS; i++)
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for (i = 0; i < config.immu.nways; i++)
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if (getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU) < minlru)
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if (getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU) < minlru)
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minway = i;
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minway = i;
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setsprbits(SPR_ITLBMR_BASE(minway) + set, SPR_ITLBMR_VPN, vpn);
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setsprbits(SPR_ITLBMR_BASE(minway) + set, SPR_ITLBMR_VPN, vpn);
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for (i = 0; i < ITLB_WAYS; i++)
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for (i = 0; i < config.immu.nways; i++)
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if (testsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU))
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if (testsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU))
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setsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU, getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU) - 1);
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setsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU, getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU) - 1);
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setsprbits(SPR_ITLBMR_BASE(minway) + set, SPR_ITLBMR_LRU, ITLB_USTATES - 1);
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setsprbits(SPR_ITLBMR_BASE(minway) + set, SPR_ITLBMR_LRU, config.immu.ustates - 1);
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setsprbits(SPR_ITLBTR_BASE(minway) + set, SPR_ITLBTR_PPN, vpn); /* 1 to 1 */
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setsprbits(SPR_ITLBTR_BASE(minway) + set, SPR_ITLBTR_PPN, vpn); /* 1 to 1 */
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setsprbits(SPR_ITLBMR_BASE(minway) + set, SPR_ITLBMR_V, 1);
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setsprbits(SPR_ITLBMR_BASE(minway) + set, SPR_ITLBMR_V, 1);
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#endif
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#endif
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except_handle(EXCEPT_ITLBMISS, virtaddr);
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except_handle(EXCEPT_ITLBMISS, virtaddr);
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/* if tlb refill implemented in HW */
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/* if tlb refill implemented in HW */
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/* return getsprbits(SPR_ITLBTR_BASE(minway) + set, SPR_ITLBTR_PPN) * PAGE_SIZE + (virtaddr % PAGE_SIZE); */
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/* return getsprbits(SPR_ITLBTR_BASE(minway) + set, SPR_ITLBTR_PPN) * config.immu.pagesize + (virtaddr % config.immu.pagesize); */
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return 0;
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return 0;
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}
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}
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}
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}
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No newline at end of file
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No newline at end of file
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