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>
diff --git a/src/include/pc80/mc146818rtc.h b/src/include/pc80/mc146818rtc.h
index 3e5a61a..24dac2c 100644
--- a/src/include/pc80/mc146818rtc.h
+++ b/src/include/pc80/mc146818rtc.h
@@ -104,6 +104,22 @@
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__)