diff options
| author | Duncan Laurie <dlaurie@chromium.org> | 2011-09-26 13:24:40 -0700 |
|---|---|---|
| committer | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2012-03-28 21:35:10 +0200 |
| commit | 654f2934653ee5ca4bd43217abbc49a9140c8ad0 (patch) | |
| tree | 3a3e23df89dcbfbdc707aa6df3682609b8f0e114 /src/include/pc80 | |
| parent | 9ec8ed8a40c5c5aff8053693dd2ecd403034605b (diff) | |
Add cmos helper functions for reading/writing a dword
These get used later for saving/restoring the MRC scrambler
seed values on each boot.
Change-Id: I6e23f17649bea6d22c4b279ed8d0e5cb6c0885e7
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: http://review.coreboot.org/717
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/include/pc80')
| -rw-r--r-- | src/include/pc80/mc146818rtc.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/include/pc80/mc146818rtc.h b/src/include/pc80/mc146818rtc.h index 3e5a61a706..24dac2c098 100644 --- a/src/include/pc80/mc146818rtc.h +++ b/src/include/pc80/mc146818rtc.h @@ -104,6 +104,22 @@ static inline void cmos_write(unsigned char val, unsigned char addr) outb(addr, RTC_BASE_PORT + offs + 0); outb(val, RTC_BASE_PORT + offs + 1); } + +static inline u32 cmos_read32(u8 offset) +{ + u32 value = 0; + u8 i; + for (i = 0; i < sizeof(value); ++i) + value |= cmos_read(offset + i) << (i << 3); + return value; +} + +static inline void cmos_write32(u8 offset, u32 value) +{ + u8 i; + for (i = 0; i < sizeof(value); ++i) + cmos_write((value >> (i << 3)) & 0xff, offset + i); +} #endif #if !defined(__ROMCC__) |