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Extended the VAX 8600 memory to 512MB and reworked the memory board slot allocation logic to fill as many slots as possible.

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This commit is contained in:
Mark Pizzolato 2013-04-05 12:16:01 -07:00
parent ed6e3f75d2
commit a005822186
3 changed files with 41 additions and 20 deletions
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52
VAX/vax860_abus.c
View file

@ -192,7 +192,7 @@ DEVICE abus_dev = {
};
/*
The 8600/8650 systems can have a max of 260MB of memory.
The 8600/8650 systems can have a max of 260MB of physical memory.
There are three different memory boards that exists: 4MB, 16MB, and 64MB.
In addition, you can mix different boards.
The rule is to put large boards first, and smaller boards later.
@ -205,6 +205,13 @@ up any other slot.
If you are using 16MB boards, the max memory is 68MB.
Slot 0,2,4 and 6 will have 16MB boards. And then you can place a 4MB board in slot 7.
Same story with the 64MB boards.
The system architecture reserves 512MB of address space for memory, so the
simulated memory can be expanded up to 512MB using 2 256MB memory boards which
never existed but are easy to simulate. We call these fictional boards MS86-E
The logic here fills as many slots as possible with memory boards to describe
the total system memory size.
*/
void init_pamm()
@ -212,28 +219,27 @@ void init_pamm()
int32 addr = 0;
int32 mem = (int32)(MEMSIZE >> 20);
int32 slot = 0;
int32 size = 0;
int32 slots_remaining = 8;
int32 size = 4;
int32 i;
for (i=0; i<1024; i++)
pamm[i] = PAMM_NXM;
for (;mem > 0; ) {
if (mem >= 64)
size = 64;
else {
if (mem >= 16)
size = 16;
else
size = 4;
}
if ((size > 4) && (slot > 0))
size = 4;
while (mem/size > slots_remaining/((size > 4) ? 2 : 1))
size = size * 4;
if ((size > 4) && (slot > 0)) {
slot++;
slots_remaining--;
}
if (slot < 8) {
for (i=0; i<size; i++)
pamm[addr++] = slot;
}
slot++;
slots_remaining--;
mem -= size;
}
@ -245,7 +251,16 @@ t_stat cpu_show_memory (FILE* st, UNIT* uptr, int32 val, void* desc)
{
int32 slot[32];
int32 base[32];
int32 i;
struct {
int capacity;
char *option;
} boards[] = {
{ 4, "MS86-B"},
{ 16, "MS86-C"},
{ 64, "MS86-D"},
{256, "MS86-E"}, /* Fake 256MB board which never existed */
{ 0, NULL}};
int32 i, j;
for (i=0; i<32; i++)
slot[i] = base[i] = 0;
@ -256,23 +271,26 @@ for (i=1023; i>=0; i--) {
}
for (i=0; i<8; i++) {
if (slot[i] > 0)
fprintf(st, "Memory slot %d (@0x%08x): %d Mbytes.\n", i, base[i] << 20, slot[i]);
if (slot[i] > 0) {
for (j=0; boards[j].option && boards[j].capacity != slot[i]; ++j)
;
fprintf(st, "Memory slot %d (@0x%08x): %3d Mbytes (%s).\n", i, base[i] << 20, boards[j].capacity, boards[j].option);
}
}
for (i=8; i<0x18; i++) {
if (slot[i] > 0)
fprintf(st, "Unused code %d (@0x%08x): %d Mbytes.\n", i, base[i] << 20, slot[i]);
fprintf(st, "Unused code %d (@0x%08x): %3d Mbytes.\n", i, base[i] << 20, slot[i]);
}
for (i=0x18; i<0x1c; i++) {
if (slot[i] > 0)
fprintf(st, "I/O adapter %d (@0x%08x): %d Mbytes.\n", i-0x18, base[i] << 20, slot[i]);
fprintf(st, "I/O adapter %d (@0x%08x): %3d Mbytes.\n", i-0x18, base[i] << 20, slot[i]);
}
for (i=0x1c; i<0x1f; i++) {
if (slot[i] > 0)
fprintf(st, "Unused code %d (@0x%08x): %d Mbytes.\n", i, base[i] << 20, slot[i]);
fprintf(st, "Unused code %d (@0x%08x): %3d Mbytes.\n", i, base[i] << 20, slot[i]);
}
fprintf(st, "Ununsed address space: %d Mbytes.\n", slot[0x1f]);

5
VAX/vax860_defs.h
View file

@ -178,8 +178,8 @@
#define MAXMEMWIDTH 25 /* max mem, 4MB boards */
#define MAXMEMSIZE (1 << MAXMEMWIDTH)
#define MAXMEMWIDTH_X 28 /* max mem, 64MB boards */
#define MAXMEMSIZE_X ((1 << MAXMEMWIDTH_X) + (1 << 22)) /* 8 64MB + 1 4MB */
#define MAXMEMWIDTH_X 29 /* max mem space using non-existant 256MB boards */
#define MAXMEMSIZE_X (1 << MAXMEMWIDTH_X)
#define INITMEMSIZE (1 << MAXMEMWIDTH) /* initial memory size */
#define MEMSIZE (cpu_unit.capac)
#define ADDR_IS_MEM(x) (((uint32) (x)) < MEMSIZE)
@ -192,6 +192,7 @@
{ UNIT_MSIZE, (1u << 27), NULL, "128M", &cpu_set_size, NULL, NULL, "Set Memory to 128M bytes" }, \
{ UNIT_MSIZE, (1u << 28), NULL, "256M", &cpu_set_size, NULL, NULL, "Set Memory to 256M bytes" }, \
{ UNIT_MSIZE, (1u << 28) + (1u << 22), NULL, "260M", &cpu_set_size, NULL, NULL, "Set Memory to 260M bytes" }, \
{ UNIT_MSIZE, (1u << 29), NULL, "512M", &cpu_set_size, NULL, NULL, "Set Memory to 512M bytes" }, \
{ MTAB_XTD|MTAB_VDV|MTAB_NMO, 0, "MEMORY", NULL, NULL, &cpu_show_memory, NULL, "Display memory configuration" }
extern t_stat cpu_show_memory (FILE* st, UNIT* uptr, int32 val, void* desc);

4
scp.c
View file

@ -2556,7 +2556,9 @@ else if ((shptr = find_shtab (show_glob_tab, gbuf))) /* global? */
else {
if (sim_dflt_dev->modifiers)
for (mptr = sim_dflt_dev->modifiers; mptr->mask != 0; mptr++) {
if (mptr->mstring && (MATCH_CMD (gbuf, mptr->mstring) == 0)) {
if ((((mptr->mask & MTAB_VDV) == MTAB_VDV) &&
(mptr->pstring && (MATCH_CMD (gbuf, mptr->pstring) == 0))) ||
(!(mptr->mask & MTAB_VDV) && (mptr->mstring && (MATCH_CMD (gbuf, mptr->mstring) == 0)))) {
dptr = sim_dflt_dev;
cptr -= strlen (gbuf) + 1;
while (isspace(*cptr))