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| author | Kevin O'Connor <kevin@koconnor.net> | 2013-02-07 23:41:53 -0500 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2013-02-09 11:09:36 -0500 |
| commit | 0f6198a116fdffeeaa3cf6036f4ca6611a71b2b3 (patch) | |
| tree | 56cb4059889df49c8fd7930b61227c9c4d59a612 | |
| parent | 5d47eb484efed2ab20ce21f2211ab1f5f57b963f (diff) | |
| download | seabios-0f6198a116fdffeeaa3cf6036f4ca6611a71b2b3.tar.gz | |
Determine century during init and store in VARLOW mem during runtime.
Avoid reading/writing to cmos at runtime to get the QEMU century
information. Instead, read it at startup and cache the info.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
| -rw-r--r-- | src/clock.c | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/src/clock.c b/src/clock.c index 3edcaf5..bbcafd7 100644 --- a/src/clock.c +++ b/src/clock.c @@ -281,6 +281,8 @@ bcd2bin(u8 val) return (val & 0xf) + ((val >> 4) * 10); } +u8 Century VARLOW; + void timer_setup(void) { @@ -297,6 +299,18 @@ timer_setup(void) ticks = ((u64)ticks * PIT_TICK_RATE) / PIT_TICK_INTERVAL; SET_BDA(timer_counter, ticks); + // Setup Century storage + if (CONFIG_QEMU) { + Century = inb_cmos(CMOS_CENTURY); + } else { + // Infer current century from the year. + u8 year = inb_cmos(CMOS_RTC_YEAR); + if (year > 0x80) + Century = 0x19; + else + Century = 0x20; + } + enable_hwirq(0, FUNC16(entry_08)); enable_hwirq(8, FUNC16(entry_70)); } @@ -420,14 +434,7 @@ handle_1a04(struct bregs *regs) regs->cl = inb_cmos(CMOS_RTC_YEAR); regs->dh = inb_cmos(CMOS_RTC_MONTH); regs->dl = inb_cmos(CMOS_RTC_DAY_MONTH); - if (CONFIG_COREBOOT) { - if (regs->cl > 0x80) - regs->ch = 0x19; - else - regs->ch = 0x20; - } else { - regs->ch = inb_cmos(CMOS_CENTURY); - } + regs->ch = GET_LOW(Century); regs->al = regs->ch; set_success(regs); } @@ -454,8 +461,7 @@ handle_1a05(struct bregs *regs) outb_cmos(regs->cl, CMOS_RTC_YEAR); outb_cmos(regs->dh, CMOS_RTC_MONTH); outb_cmos(regs->dl, CMOS_RTC_DAY_MONTH); - if (!CONFIG_COREBOOT) - outb_cmos(regs->ch, CMOS_CENTURY); + SET_LOW(Century, regs->ch); // clear halt-clock bit u8 val8 = inb_cmos(CMOS_STATUS_B) & ~RTC_B_SET; outb_cmos(val8, CMOS_STATUS_B); |