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authorPatrick Georgi <patrick.georgi@secunet.com>2011-01-21 07:18:20 +0000
committerPatrick Georgi <patrick.georgi@coresystems.de>2011-01-21 07:18:20 +0000
commitbe5a178de731dd6b255c38c1e63b3de8b3008a14 (patch)
tree0dd2355ea5b840af525d11d894bc17c216f7ae3f
parent0d4f6536b0b61ead20b4a8c2e1600dec513218e8 (diff)
downloadcoreboot-be5a178de731dd6b255c38c1e63b3de8b3008a14.tar.xz
Abstract CMOS accesses a bit more in preparation of using
files for CMOS data. Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com> Acked-by: Stefan Reinauer <stepan@coreboot.org> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6283 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
-rw-r--r--util/nvramtool/cmos_lowlevel.c91
1 files changed, 63 insertions, 28 deletions
diff --git a/util/nvramtool/cmos_lowlevel.c b/util/nvramtool/cmos_lowlevel.c
index ecfc99b74f..9f44a0b18a 100644
--- a/util/nvramtool/cmos_lowlevel.c
+++ b/util/nvramtool/cmos_lowlevel.c
@@ -36,6 +36,67 @@
#include "common.h"
#include "cmos_lowlevel.h"
+/* Hardware Abstraction Layer: lowlevel byte-wise write access */
+typedef struct {
+ void (*init)(void* data);
+ unsigned char (*read)(unsigned addr);
+ void (*write)(unsigned addr, unsigned char value);
+} cmos_access_t;
+
+static void cmos_hal_init(void* data);
+static unsigned char cmos_hal_read(unsigned addr);
+static void cmos_hal_write(unsigned addr, unsigned char value);
+
+static cmos_access_t cmos_hal = {
+ .init = cmos_hal_init,
+ .read = cmos_hal_read,
+ .write = cmos_hal_write
+};
+
+static cmos_access_t *current_access = &cmos_hal;
+
+/* no need to initialize anything */
+static void cmos_hal_init(__attribute__((unused)) void *data)
+{
+}
+
+static unsigned char cmos_hal_read(unsigned index)
+{
+ unsigned short port_0, port_1;
+
+ assert(!verify_cmos_byte_index(index));
+
+ if (index < 128) {
+ port_0 = 0x70;
+ port_1 = 0x71;
+ } else {
+ port_0 = 0x72;
+ port_1 = 0x73;
+ }
+
+ OUTB(index, port_0);
+ return INB(port_1);
+}
+
+static void cmos_hal_write(unsigned index, unsigned char value)
+{
+ unsigned short port_0, port_1;
+
+ assert(!verify_cmos_byte_index(index));
+
+ if (index < 128) {
+ port_0 = 0x70;
+ port_1 = 0x71;
+ } else {
+ port_0 = 0x72;
+ port_1 = 0x73;
+ }
+
+ OUTB(index, port_0);
+ OUTB(value, port_1);
+}
+
+/* Bit-level access */
typedef struct {
unsigned byte_index;
unsigned bit_offset;
@@ -181,20 +242,7 @@ void cmos_write(const cmos_entry_t * e, unsigned long long value)
****************************************************************************/
unsigned char cmos_read_byte(unsigned index)
{
- unsigned short port_0, port_1;
-
- assert(!verify_cmos_byte_index(index));
-
- if (index < 128) {
- port_0 = 0x70;
- port_1 = 0x71;
- } else {
- port_0 = 0x72;
- port_1 = 0x73;
- }
-
- OUTB(index, port_0);
- return INB(port_1);
+ return current_access->read(index);
}
/****************************************************************************
@@ -209,20 +257,7 @@ unsigned char cmos_read_byte(unsigned index)
****************************************************************************/
void cmos_write_byte(unsigned index, unsigned char value)
{
- unsigned short port_0, port_1;
-
- assert(!verify_cmos_byte_index(index));
-
- if (index < 128) {
- port_0 = 0x70;
- port_1 = 0x71;
- } else {
- port_0 = 0x72;
- port_1 = 0x73;
- }
-
- OUTB(index, port_0);
- OUTB(value, port_1);
+ current_access->write(index, value);
}
/****************************************************************************