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Add base memory backfill for Everex EV-159

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Add standard base memory backfill and special CS8220 mode backfill for Everex EV-159
This commit is contained in:
WNT50
2025-11-10 05:29:08 +08:00
parent e852aa0d61
commit 3444080d97
1 changed files with 21 additions and 0 deletions
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21
src/device/isamem.c
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@@ -115,6 +115,10 @@
#define RAM_UMAMEM (384 << 10) /* upper memory block */
#define RAM_EXTMEM (1024 << 10) /* start of high memory */
#define EV159_BASE_MEM (128 << 10) /* size of EV-159 base memory in cs8220 mode*/
#define EV159_EXT_1536 (1536 << 10) /* start of EV-159 high memory in cs8220 mode*/
#define EV159_EXT_1024 (1024 << 10) /* start of EV-159 high memory in backfill mode*/
#define EMS_MAXSIZE (2048 << 10) /* max EMS memory size */
#define EMS_EV159_MAXSIZE (3072 << 10) /* max EMS memory size for EV-159 cards */
#define EMS_LOTECH_MAXSIZE (4096 << 10) /* max EMS memory size for lotech cards */
@@ -635,6 +639,14 @@ isamem_init(const device_t *info)
* so check this first.
*/
t = (addr < RAM_TOPMEM) ? RAM_TOPMEM - addr : 0;
/* Check for Everex EV-159 cards in CS8220 backfill mode. */
if ((addr == RAM_TOPMEM) && (dev->board == ISAMEM_EV159_CARD)) {
/* Reserve 128K RAM for base memory. */
t = EV159_BASE_MEM;
addr -= t;
}
if (t > 0) {
/*
* We need T bytes to extend that area.
@@ -669,6 +681,15 @@ isamem_init(const device_t *info)
addr += t;
}
/* Assign high memory address for EV-159 in backfill modes. */
if ((addr == RAM_TOPMEM) && (dev->board == ISAMEM_EV159_CARD)) {
if (dev->start_addr == RAM_TOPMEM) {
addr = EV159_EXT_1536;
} else {
addr = EV159_EXT_1024;
}
}
/* Skip to high memory if needed. */
if ((addr == RAM_TOPMEM) && (tot >= RAM_UMAMEM)) {
/*