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time: Work around potential issue with day wraparound

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This commit is contained in:
mintsuki 2022-03-08 14:26:08 +01:00
parent f59a1eac0b
commit 08547c0d8f
1 changed files with 12 additions and 1 deletions
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13
common/lib/time.c
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@ -28,8 +28,10 @@ static uint64_t get_unix_epoch(uint8_t seconds, uint8_t minutes, uint8_t hours,
#if bios == 1
uint64_t time(void) {
struct rm_regs r = {0};
struct rm_regs r;
again:
r = (struct rm_regs){0};
r.eax = 0x0400;
rm_int(0x1a, &r, &r);
@ -38,6 +40,7 @@ uint64_t time(void) {
uint16_t year = bcd_to_int( r.ecx & 0x00ff) +
/* century */ bcd_to_int((r.ecx & 0xff00) >> 8) * 100;
r = (struct rm_regs){0};
r.eax = 0x0200;
rm_int(0x1a, &r, &r);
@ -45,6 +48,14 @@ uint64_t time(void) {
uint8_t minute = bcd_to_int( r.ecx & 0x00ff);
uint8_t hour = bcd_to_int((r.ecx & 0xff00) >> 8);
// Check RTC day wraparound
r = (struct rm_regs){0};
r.eax = 0x0400;
rm_int(0x1a, &r, &r);
if (bcd_to_int(r.edx & 0x00ff) != day) {
goto again;
}
return get_unix_epoch(second, minute, hour, day, month, year);
}
#endif