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/* alpha_ev5_tlb.c - Alpha EV5 TLB simulator
Copyright (c) 2003-2006, Robert M Supnik
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Robert M Supnik shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Robert M Supnik.
EV5 was the second generation Alpha CPU. It was a four-way, in order issue
CPU with onchip primary instruction and data caches, an onchip second level
cache, and support for an offchip third level cache. EV56 was a shrink, with
added support for byte and word operations. EV56PC was a version of EV56
without the onchip second level cache.
This module contains the routines for
itlb_lookup lookup vpn in instruction TLB
itlb_load load pte into instruction TLB
itlb_read read pte from instruction TLB using NLU pointer
itlb_set_asn set iasn
itlb_set_cm set icm
itlb_set_spage set ispage
dtlb_lookup lookup vpn in data TLB
dtlb_load load pte into data TLB
dtlb_read read pte from data TLB using NLU pointer
dtlb_set_asn set dasn
dtlb_set_cm set dcm
dtlb_set_spage set dspage
tlb_ia TLB invalidate all
tlb_is TLB invalidate single
tlb_set_cm TLB set current mode
*/
#include "alpha_defs.h"
#include "alpha_ev5_defs.h"
#define ITLB_SORT qsort (itlb, ITLB_SIZE, sizeof (TLBENT), &tlb_comp);
#define DTLB_SORT qsort (dtlb, DTLB_SIZE, sizeof (TLBENT), &tlb_comp);
#define TLB_ESIZE (sizeof (TLBENT)/sizeof (uint32))
#define MM_RW(x) (((x) & PTE_FOW)? EXC_W: EXC_R)
uint32 itlb_cm = 0; /* current modes */
uint32 itlb_spage = 0; /* superpage enables */
uint32 itlb_asn = 0;
uint32 itlb_nlu = 0;
TLBENT i_mini_tlb;
TLBENT itlb[ITLB_SIZE];
uint32 dtlb_cm = 0;
uint32 dtlb_spage = 0;
uint32 dtlb_asn = 0;
uint32 dtlb_nlu = 0;
TLBENT d_mini_tlb;
TLBENT dtlb[DTLB_SIZE];
uint32 cm_eacc = ACC_E (MODE_K); /* precomputed */
uint32 cm_racc = ACC_R (MODE_K); /* access checks */
uint32 cm_wacc = ACC_W (MODE_K);
uint32 cm_macc = ACC_M (MODE_K);
extern t_uint64 p1;
extern jmp_buf save_env;
uint32 mm_exc (uint32 macc);
void tlb_inval (TLBENT *tlbp);
t_stat itlb_reset (void);
t_stat dtlb_reset (void);
int tlb_comp (const void *e1, const void *e2);
t_stat tlb_reset (DEVICE *dptr);
/* TLB data structures
tlb_dev pager device descriptor
tlb_unit pager units
tlb_reg pager register list
*/
UNIT tlb_unit = { UDATA (NULL, 0, 0) };
REG tlb_reg[] = {
{ HRDATA (ICM, itlb_cm, 2) },
{ HRDATA (ISPAGE, itlb_spage, 2), REG_HRO },
{ HRDATA (IASN, itlb_asn, ITB_ASN_WIDTH) },
{ HRDATA (INLU, itlb_nlu, ITLB_WIDTH) },
{ BRDATA (IMINI, &i_mini_tlb, 16, 32, TLB_ESIZE) },
{ BRDATA (ITLB, itlb, 16, 32, ITLB_SIZE*TLB_ESIZE) },
{ HRDATA (DCM, dtlb_cm, 2) },
{ HRDATA (DSPAGE, dtlb_spage, 2), REG_HRO },
{ HRDATA (DASN, dtlb_asn, DTB_ASN_WIDTH) },
{ HRDATA (DNLU, dtlb_nlu, DTLB_WIDTH) },
{ BRDATA (DMINI, &d_mini_tlb, 16, 32, TLB_ESIZE) },
{ BRDATA (DTLB, dtlb, 16, 32, DTLB_SIZE*TLB_ESIZE) },
{ NULL }
};
DEVICE tlb_dev = {
"TLB", &tlb_unit, tlb_reg, NULL,
1, 0, 0, 1, 0, 0,
NULL, NULL, &tlb_reset,
NULL, NULL, NULL
};
/* Translate address, instruction, data, and console
Inputs:
va = virtual address
acc = (VAX only) access mode
Outputs:
pa = translation buffer index
*/
t_uint64 trans_i (t_uint64 va)
{
uint32 va_sext = VA_GETSEXT (va);
uint32 vpn = VA_GETVPN (va);
TLBENT *tlbp;
if ((va_sext != 0) && (va_sext != VA_M_SEXT)) /* invalid virt addr? */
ABORT1 (va, EXC_BVA + EXC_E);
if ((itlb_spage & SPEN_43) && VPN_GETSP43 (vpn) == 2) { /* 43b superpage? */
if (itlb_cm != MODE_K) ABORT1 (va, EXC_ACV + EXC_E);
return (va & SP43_MASK);
}
if ((itlb_spage & SPEN_32) && (VPN_GETSP32 (vpn) == 0x1FFE)) {
if (itlb_cm != MODE_K) ABORT1 (va, EXC_ACV + EXC_E);
return (va & SP32_MASK); /* 32b superpage? */
}
if (!(tlbp = itlb_lookup (vpn))) /* lookup vpn; miss? */
ABORT1 (va, EXC_TBM + EXC_E); /* abort reference */
if (cm_eacc & ~tlbp->pte) /* check access */
ABORT1 (va, mm_exc (cm_eacc & ~tlbp->pte) | EXC_E);
return PHYS_ADDR (tlbp->pfn, va); /* return phys addr */
}
t_uint64 trans_d (t_uint64 va, uint32 acc)
{
uint32 va_sext = VA_GETSEXT (va);
uint32 vpn = VA_GETVPN (va);
TLBENT *tlbp;
if ((va_sext != 0) && (va_sext != VA_M_SEXT)) /* invalid virt addr? */
ABORT1 (va, EXC_BVA + MM_RW (acc));
if ((dtlb_spage & SPEN_43) && (VPN_GETSP43 (vpn) == 2)) {
if (dtlb_cm != MODE_K) ABORT1 (va, EXC_ACV + MM_RW (acc));
return (va & SP43_MASK); /* 43b superpage? */
}
if ((dtlb_spage & SPEN_32) && (VPN_GETSP32 (vpn) == 0x1FFE)) {
if (dtlb_cm != MODE_K) ABORT1 (va, EXC_ACV + MM_RW (acc));
return (va & SP32_MASK); /* 32b superpage? */
}
if (!(tlbp = dtlb_lookup (vpn))) /* lookup vpn; miss? */
ABORT1 (va, EXC_TBM + MM_RW (acc)); /* abort reference */
if (acc & ~tlbp->pte) /* check access */
ABORT1 (va, mm_exc (acc & ~tlbp->pte) | MM_RW (acc));
return PHYS_ADDR (tlbp->pfn, va); /* return phys addr */
}
/* Generate a memory management error code, based on the access check bits not
set in PTE
- If the access check bits, without FOx and V, fail, then ACV
- If FOx set, then FOx
- Otherwise, TNV */
uint32 mm_exc (uint32 not_set)
{
uint32 tacc;
tacc = not_set & ~(PTE_FOR | PTE_FOW | PTE_FOE | PTE_V);
if (tacc) return EXC_ACV;
tacc = not_set & (PTE_FOR | PTE_FOW | PTE_FOE);
if (tacc) return EXC_FOX;
return EXC_TNV;
}
/* TLB invalidate single */
void tlb_is (t_uint64 va, uint32 flags)
{
uint32 va_sext = VA_GETSEXT (va);
uint32 vpn = VA_GETVPN (va);
TLBENT *itlbp, *dtlbp;
if ((va_sext != 0) && (va_sext != VA_M_SEXT)) return;
if ((flags & TLB_CI) && (itlbp = itlb_lookup (vpn))) {
tlb_inval (itlbp);
tlb_inval (&i_mini_tlb);
ITLB_SORT;
}
if ((flags & TLB_CD) && (dtlbp = dtlb_lookup (vpn))) {
tlb_inval (dtlbp);
tlb_inval (&d_mini_tlb);
DTLB_SORT;
}
return;
}
/* TLB invalidate all */
void tlb_ia (uint32 flags)
{
uint32 i;
if (flags & TLB_CA) {
if (flags & TLB_CI) itlb_reset ();
if (flags & TLB_CD) dtlb_reset ();
return;
}
if (flags & TLB_CI) {
for (i = 0; i < ITLB_SIZE; i++) {
if (!(itlb[i].pte & PTE_ASM)) tlb_inval (&itlb[i]);
}
tlb_inval (&i_mini_tlb);
ITLB_SORT;
}
if (flags & TLB_CD) {
for (i = 0; i < DTLB_SIZE; i++) {
if (!(dtlb[i].pte & PTE_ASM)) tlb_inval (&dtlb[i]);
}
tlb_inval (&d_mini_tlb);
DTLB_SORT;
}
return;
}
/* TLB lookup */
TLBENT *itlb_lookup (uint32 vpn)
{
int32 p, hi, lo;
if (vpn == i_mini_tlb.tag) return &i_mini_tlb;
lo = 0; /* initial bounds */
hi = ITLB_SIZE - 1;
do {
p = (lo + hi) >> 1; /* probe */
if ((itlb_asn == itlb[p].asn) &&
(((vpn ^ itlb[p].tag) &
~((uint32) itlb[p].gh_mask)) == 0)) { /* match to TLB? */
i_mini_tlb.tag = vpn;
i_mini_tlb.pte = itlb[p].pte;
i_mini_tlb.pfn = itlb[p].pfn;
itlb_nlu = itlb[p].idx + 1;
if (itlb_nlu >= ITLB_SIZE) itlb_nlu = 0;
return &i_mini_tlb;
}
if ((itlb_asn < itlb[p].asn) ||
((itlb_asn == itlb[p].asn) && (vpn < itlb[p].tag)))
hi = p - 1; /* go down? p is upper */
else lo = p + 1; /* go up? p is lower */
}
while (lo <= hi);
return NULL;
}
TLBENT *dtlb_lookup (uint32 vpn)
{
int32 p, hi, lo;
if (vpn == d_mini_tlb.tag) return &d_mini_tlb;
lo = 0; /* initial bounds */
hi = DTLB_SIZE - 1;
do {
p = (lo + hi) >> 1; /* probe */
if ((dtlb_asn == dtlb[p].asn) &&
(((vpn ^ dtlb[p].tag) &
~((uint32) dtlb[p].gh_mask)) == 0)) { /* match to TLB? */
d_mini_tlb.tag = vpn;
d_mini_tlb.pte = dtlb[p].pte;
d_mini_tlb.pfn = dtlb[p].pfn;
dtlb_nlu = dtlb[p].idx + 1;
if (dtlb_nlu >= DTLB_SIZE) dtlb_nlu = 0;
return &d_mini_tlb;
}
if ((dtlb_asn < dtlb[p].asn) ||
((dtlb_asn == dtlb[p].asn) && (vpn < dtlb[p].tag)))
hi = p - 1; /* go down? p is upper */
else lo = p + 1; /* go up? p is lower */
}
while (lo <= hi);
return NULL;
}
/* Load TLB entry at NLU pointer, advance NLU pointer */
TLBENT *itlb_load (uint32 vpn, t_uint64 l3pte)
{
uint32 i, gh;
for (i = 0; i < ITLB_SIZE; i++) {
if (itlb[i].idx == itlb_nlu) {
TLBENT *tlbp = itlb + i;
itlb_nlu = itlb_nlu + 1;
if (itlb_nlu >= ITLB_SIZE) itlb_nlu = 0;
tlbp->tag = vpn;
tlbp->pte = (uint32) (l3pte & PTE_MASK) ^ (PTE_FOR|PTE_FOR|PTE_FOE);
tlbp->pfn = ((uint32) (l3pte >> PTE_V_PFN)) & PFN_MASK;
tlbp->asn = itlb_asn;
gh = PTE_GETGH (tlbp->pte);
tlbp->gh_mask = (1u << (3 * gh)) - 1;
tlb_inval (&i_mini_tlb);
ITLB_SORT;
return tlbp;
}
}
fprintf (stderr, "%%ITLB entry not found, itlb_nlu = %d\n", itlb_nlu);
ABORT (-SCPE_IERR);
return NULL;
}
TLBENT *dtlb_load (uint32 vpn, t_uint64 l3pte)
{
uint32 i, gh;
for (i = 0; i < DTLB_SIZE; i++) {
if (dtlb[i].idx == dtlb_nlu) {
TLBENT *tlbp = dtlb + i;
dtlb_nlu = dtlb_nlu + 1;
if (dtlb_nlu >= ITLB_SIZE) dtlb_nlu = 0;
tlbp->tag = vpn;
tlbp->pte = (uint32) (l3pte & PTE_MASK) ^ (PTE_FOR|PTE_FOR|PTE_FOE);
tlbp->pfn = ((uint32) (l3pte >> PTE_V_PFN)) & PFN_MASK;
tlbp->asn = dtlb_asn;
gh = PTE_GETGH (tlbp->pte);
tlbp->gh_mask = (1u << (3 * gh)) - 1;
tlb_inval (&d_mini_tlb);
DTLB_SORT;
return tlbp;
}
}
fprintf (stderr, "%%DTLB entry not found, dtlb_nlu = %d\n", dtlb_nlu);
ABORT (-SCPE_IERR);
return NULL;
}
/* Read TLB entry at NLU pointer, advance NLU pointer */
t_uint64 itlb_read (void)
{
uint8 i;
for (i = 0; i < ITLB_SIZE; i++) {
if (itlb[i].idx == itlb_nlu) {
TLBENT *tlbp = itlb + i;
itlb_nlu = itlb_nlu + 1;
if (itlb_nlu >= ITLB_SIZE) itlb_nlu = 0;
return (((t_uint64) tlbp->pfn) << PTE_V_PFN) |
((tlbp->pte ^ (PTE_FOR|PTE_FOR|PTE_FOE)) & PTE_MASK);
}
}
fprintf (stderr, "%%ITLB entry not found, itlb_nlu = %d\n", itlb_nlu);
ABORT (-SCPE_IERR);
return 0;
}
t_uint64 dtlb_read (void)
{
uint8 i;
for (i = 0; i < DTLB_SIZE; i++) {
if (dtlb[i].idx == dtlb_nlu) {
TLBENT *tlbp = dtlb + i;
dtlb_nlu = dtlb_nlu + 1;
if (dtlb_nlu >= DTLB_SIZE) dtlb_nlu = 0;
return (((t_uint64) tlbp->pfn) << PTE_V_PFN) |
((tlbp->pte ^ (PTE_FOR|PTE_FOR|PTE_FOE)) & PTE_MASK);
}
}
fprintf (stderr, "%%DTLB entry not found, dtlb_nlu = %d\n", dtlb_nlu);
ABORT (-SCPE_IERR);
return 0;
}
/* Set ASN - rewrite TLB globals with correct ASN */
void itlb_set_asn (uint32 asn)
{
int32 i;
itlb_asn = asn;
for (i = 0; i < ITLB_SIZE; i++) {
if (itlb[i].pte & PTE_ASM) itlb[i].asn = asn;
}
tlb_inval (&i_mini_tlb);
ITLB_SORT;
return;
}
void dtlb_set_asn (uint32 asn)
{
int32 i;
dtlb_asn = asn;
for (i = 0; i < DTLB_SIZE; i++) {
if (dtlb[i].pte & PTE_ASM) dtlb[i].asn = asn;
}
tlb_inval (&d_mini_tlb);
DTLB_SORT;
return;
}
/* Set superpage */
void itlb_set_spage (uint32 spage)
{
itlb_spage = spage;
return;
}
void dtlb_set_spage (uint32 spage)
{
dtlb_spage = spage;
return;
}
/* Set current mode */
void itlb_set_cm (uint32 mode)
{
itlb_cm = mode;
cm_eacc = ACC_E (mode);
return;
}
void dtlb_set_cm (uint32 mode)
{
dtlb_cm = mode;
cm_racc = ACC_R (mode);
cm_wacc = ACC_W (mode);
return;
}
uint32 tlb_set_cm (int32 cm)
{
if (cm >= 0) {
itlb_set_cm (cm);
dtlb_set_cm (cm);
return cm;
}
itlb_set_cm (itlb_cm);
dtlb_set_cm (dtlb_cm);
return dtlb_cm;
}
/* Invalidate TLB entry */
void tlb_inval (TLBENT *tlbp)
{
tlbp->tag = INV_TAG;
tlbp->pte = 0;
tlbp->pfn = 0;
tlbp->asn = tlbp->idx;
tlbp->gh_mask = 0;
return;
}
/* Compare routine for qsort */
int tlb_comp (const void *e1, const void *e2)
{
TLBENT *t1 = (TLBENT *) e1;
TLBENT *t2 = (TLBENT *) e2;
if (t1->asn > t2->asn) return +1;
if (t1->asn < t2->asn) return -1;
if (t1->tag > t2->tag) return +1;
if (t1->tag < t2->tag) return -1;
return 0;
}
/* ITLB reset */
t_stat itlb_reset (void)
{
int32 i;
itlb_nlu = 0;
for (i = 0; i < ITLB_SIZE; i++) {
itlb[i].tag = INV_TAG;
itlb[i].pte = 0;
itlb[i].pfn = 0;
itlb[i].asn = i;
itlb[i].gh_mask = 0;
itlb[i].idx = i;
}
tlb_inval (&i_mini_tlb);
return SCPE_OK;
}
/* DTLB reset */
t_stat dtlb_reset (void)
{
int32 i;
dtlb_nlu = 0;
for (i = 0; i < DTLB_SIZE; i++) {
dtlb[i].tag = INV_TAG;
dtlb[i].pte = 0;
dtlb[i].pfn = 0;
dtlb[i].asn = i;
dtlb[i].gh_mask = 0;
dtlb[i].idx = i;
}
tlb_inval (&d_mini_tlb);
return SCPE_OK;
}
/* SimH reset */
t_stat tlb_reset (DEVICE *dptr)
{
itlb_reset ();
dtlb_reset ();
return SCPE_OK;
}
/* Show TLB entry or entries */
t_stat cpu_show_tlb (FILE *of, UNIT *uptr, int32 val, void *desc)
{
t_addr lo, hi;
uint32 lnt;
TLBENT *tlbp;
DEVICE *dptr;
char *cptr = (char *) desc;
lnt = (val)? DTLB_SIZE: ITLB_SIZE;
dptr = find_dev_from_unit (uptr);
if (dptr == NULL) return SCPE_IERR;
if (cptr) {
cptr = get_range (dptr, cptr, &lo, &hi, 10, lnt, 0);
if ((cptr == NULL) || (*cptr != 0)) return SCPE_ARG;
}
else {
lo = 0;
hi = lnt - 1;
}
tlbp = (val)? dtlb + lo: itlb + lo;
do {
fprintf (of, "TLB %02d\tTAG=%02X/%08X, ", (uint32) lo, tlbp->asn, tlbp->tag);
fprintf (of, "MASK=%X, INDX=%d, ", tlbp->gh_mask, tlbp->idx);
fprintf (of, "PTE=%04X, PFN=%08X\n", tlbp->pte, tlbp->pfn);
tlbp++;
lo++;
} while (lo <= hi);
return SCPE_OK;
}