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
diff --git a/util/nvramtool/cmos_lowlevel.c b/util/nvramtool/cmos_lowlevel.c
index ecfc99b..9f44a0b 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 @@
****************************************************************************/
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 @@
****************************************************************************/
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);
}
/****************************************************************************