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Small changes to floppy type sync code

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This commit is contained in:
RichardG867
2020-05-01 20:11:19 -03:00
parent 6c4a6026f3
commit 216d5f9fa2
1 changed files with 25 additions and 25 deletions
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50
src/nvr_at.c
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@@ -772,44 +772,44 @@ nvr_start(nvr_t *nvr)
mark everything as bad. */
if (machines[machine].flags & MACHINE_COREBOOT) {
/* Sync floppy drive types on coreboot machines, as SeaBIOS lacks a setup
utility and just leaves these untouched. */
/* Sync floppy drive types on coreboot machines, as SeaBIOS
lacks a setup utility and just leaves these untouched. */
nvr->regs[RTC_FDD_TYPES] = 0x00;
nvr->regs[RTC_INST_EQUIP] |= 0xc0;
for (i = 0; i <= 1; i++) {
if (fdd_get_type(i)) {
if (fdd_is_525(i)) {
if (fdd_is_hd(i))
fdd = 2;
else if (fdd_doublestep_40(i))
fdd = 3;
else
fdd = 1;
} else {
if (fdd_is_hd(i))
fdd = 4;
else if (fdd_is_double_sided(i))
fdd = 3;
else
fdd = 1;
}
if (!fdd_get_type(i))
continue; /* No floppy drive. */
nvr->regs[RTC_FDD_TYPES] |= (fdd << ((1 - i) * 4));
nvr->regs[RTC_INST_EQUIP] &= 0x3f; /* At least one drive installed. */
if (fdd_is_525(i)) {
if (fdd_is_hd(i))
fdd = 2; /* 1.2 MB */
else if (fdd_doublestep_40(i))
fdd = 3; /* 720 KB */
else
fdd = 1; /* 360 KB */
} else {
if (fdd_is_hd(i))
fdd = 4; /* 1.44 MB */
else if (fdd_is_double_sided(i))
fdd = 3; /* 720 KB */
else
fdd = 1; /* 360 KB */
}
nvr->regs[RTC_FDD_TYPES] |= (fdd << ((1 - i) * 4));
nvr->regs[RTC_INST_EQUIP] &= 0x3f; /* At least one drive installed. */
}
if ((nvr->regs[RTC_FDD_TYPES] >> 4) && (nvr->regs[RTC_FDD_TYPES] & 0xf))
nvr->regs[RTC_INST_EQUIP] |= 0x40; /* Two drives installed. */
/* Re-compute CMOS checksum. SeaBIOS also doesn't care about the checksum,
but Windows does. */
/* Re-compute CMOS checksum. SeaBIOS doesn't care
about the checksum either, but Windows does. */
uint16_t checksum = 0;
for (i = 0x10; i <= 0x2d; i++) {
checksum += nvr->regs[i];
}
for (i = 0x10; i <= 0x2d; i++)
checksum += nvr->regs[i];
nvr->regs[0x2e] = checksum >> 8;
nvr->regs[0x2f] = checksum;
}