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Improve cmos reading

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This commit is contained in:
Fabien Siron 2016-01-27 17:51:46 +00:00
parent fd49119efa
commit 135c881e4d
1 changed files with 35 additions and 0 deletions
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35
kernel/devices/cmos.c
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@ -18,6 +18,16 @@
* and regular decimal integers. */
#define from_bcd(val) ((val / 16) * 10 + (val & 0xf))
enum cmos_values
{
CMOS_SECOND = 0,
CMOS_MINUTE = 2,
CMOS_HOUR = 4,
CMOS_DAY = 7,
CMOS_MONTH = 8,
CMOS_YEAR = 9
};
void
cmos_dump(
uint16_t * values
@ -29,6 +39,12 @@ cmos_dump(
}
}
int is_update_in_progress(void)
{
outportb(0x70, 0x0a);
return inportb(0x71) & 0x80;
}
/**
* Get the current month and day.
*
@ -127,8 +143,27 @@ uint32_t boot_time = 0;
uint32_t read_cmos(void) {
uint16_t values[128];
uint16_t old_values[128];
while (is_update_in_progress())
;
cmos_dump(values);
do
{
memcpy(old_values, values, 128);
while (is_update_in_progress())
;
cmos_dump(values);
} while ((old_values[CMOS_SECOND] != values[CMOS_SECOND]) ||
(old_values[CMOS_MINUTE] != values[CMOS_MINUTE]) ||
(old_values[CMOS_HOUR] != values[CMOS_HOUR]) ||
(old_values[CMOS_DAY] != values[CMOS_DAY]) ||
(old_values[CMOS_MONTH] != values[CMOS_MONTH]) ||
(old_values[CMOS_YEAR] != values[CMOS_YEAR]));
/* Math Time */
uint32_t time = secs_of_years(from_bcd(values[9]) - 1) +
secs_of_month(from_bcd(values[8]) - 1, from_bcd(values[9])) +