80486DX2-66/86Box-fork
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Added a fix for newly-initialized NVR on the Lucky Star 486 and AMI Apollo.

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OBattler
2021-04-25 18:47:33 +02:00
parent 4fb1c8e51f
commit b4c2a657a1
3 changed files with 15 additions and 6 deletions
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2
src/include/86box/nvr.h
View File

@@ -67,7 +67,7 @@
typedef struct _nvr_ {
char *fn; /* pathname of image file */
uint16_t size; /* device configuration */
int8_t irq;
int8_t irq, new;
uint8_t onesec_cnt;
pc_timer_t onesec_time;

4
src/nvr.c
View File

@@ -262,13 +262,15 @@ nvr_load(void)
path = nvr_path(saved_nvr->fn);
nvr_log("NVR: loading from '%s'\n", path);
fp = plat_fopen(path, "rb");
saved_nvr->new = (fp == NULL);
if (fp != NULL) {
/* Read NVR contents from file. */
if (fread(saved_nvr->regs, 1, saved_nvr->size, fp) != saved_nvr->size)
fatal("nvr_load(): Error reading data\n");
(void)fclose(fp);
}
}
} else
saved_nvr->new = 1;
/* Get the local RTC running! */
if (saved_nvr->start != NULL)

15
src/nvr_at.c
View File

@@ -610,6 +610,10 @@ nvr_reg_write(uint16_t reg, uint8_t val, void *priv)
/*FALLTHROUGH*/
default: /* non-RTC registers are just NVRAM */
if ((reg == 0x2c) && (local->flags & FLAG_LS_HACK))
nvr->new = 0;
if ((reg == 0x52) && (local->flags & FLAG_APOLLO_HACK))
nvr->new = 0;
if ((reg >= 0x38) && (reg <= 0x3f) && local->wp[0])
break;
if ((reg >= 0xb8) && (reg <= 0xbf) && local->wp[1])
@@ -701,7 +705,7 @@ nvr_read(uint16_t addr, void *priv)
break;
case 0x2c:
if (local->flags & FLAG_LS_HACK)
if (!nvr->new && (local->flags & FLAG_LS_HACK))
ret = nvr->regs[local->addr[addr_id]] & 0x7f;
else
ret = nvr->regs[local->addr[addr_id]];
@@ -709,7 +713,7 @@ nvr_read(uint16_t addr, void *priv)
case 0x2e:
case 0x2f:
if (local->flags & FLAG_LS_HACK) {
if (!nvr->new && (local->flags & FLAG_LS_HACK)) {
for (i = 0x10; i <= 0x2d; i++) {
if (i == 0x2c)
checksum += (nvr->regs[i] & 0x7f);
@@ -726,7 +730,7 @@ nvr_read(uint16_t addr, void *priv)
case 0x3e:
case 0x3f:
if (local->flags & FLAG_APOLLO_HACK) {
if (!nvr->new && (local->flags & FLAG_APOLLO_HACK)) {
/* The checksum at 3E-3F is for 37-3D and 40-7F. */
for (i = 0x37; i <= 0x3d; i++)
checksum += nvr->regs[i];
@@ -745,7 +749,7 @@ nvr_read(uint16_t addr, void *priv)
break;
case 0x52:
if (local->flags & FLAG_APOLLO_HACK)
if (!nvr->new && (local->flags & FLAG_APOLLO_HACK))
ret = nvr->regs[local->addr[addr_id]] & 0xf3;
else
ret = nvr->regs[local->addr[addr_id]];
@@ -935,10 +939,13 @@ nvr_at_init(const device_t *info)
if (info->local == 9)
local->flags |= FLAG_PIIX4;
else {
local->def = 0x00;
if ((info->local & 7) == 5)
local->flags |= FLAG_LS_HACK;
else if ((info->local & 7) == 6)
local->flags |= FLAG_APOLLO_HACK;
else
local->def = 0xff;
}
nvr->irq = 8;
local->cent = RTC_CENTURY_AT;