libpayload: Refactor highlevel CMOS access
This will allow using libpayload functions to access CMOS data in
template files in RAM or CBFS.
Change-Id: I323ed625e657cbdc1fae8c279a82ee578e83ad00
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/583
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
diff --git a/payloads/libpayload/drivers/options.c b/payloads/libpayload/drivers/options.c
index e3f08477..61e6cc5 100644
--- a/payloads/libpayload/drivers/options.c
+++ b/payloads/libpayload/drivers/options.c
@@ -30,7 +30,17 @@
#include <libpayload.h>
#include <coreboot_tables.h>
-static int options_checksum_valid(void)
+struct nvram_accessor *use_nvram = &(struct nvram_accessor) {
+ nvram_read,
+ nvram_write
+};
+
+struct cb_cmos_option_table *get_system_option_table(void)
+{
+ return phys_to_virt(lib_sysinfo.option_table);
+}
+
+static int options_checksum_valid(const struct nvram_accessor *nvram)
{
int i;
int range_start = lib_sysinfo.cmos_range_start / 8;
@@ -39,15 +49,15 @@
u16 checksum = 0, checksum_old;
for(i = range_start; i <= range_end; i++) {
- checksum += nvram_read(i);
+ checksum += nvram->read(i);
}
- checksum_old = ((nvram_read(checksum_location)<<8) | nvram_read(checksum_location+1));
+ checksum_old = ((nvram->read(checksum_location)<<8) | nvram->read(checksum_location+1));
return (checksum_old == checksum);
}
-void fix_options_checksum(void)
+void fix_options_checksum_with(const struct nvram_accessor *nvram)
{
int i;
int range_start = lib_sysinfo.cmos_range_start / 8;
@@ -56,14 +66,19 @@
u16 checksum = 0;
for(i = range_start; i <= range_end; i++) {
- checksum += nvram_read(i);
+ checksum += nvram->read(i);
}
- nvram_write((checksum >> 8), checksum_location);
- nvram_write((checksum & 0xff), checksum_location + 1);
+ nvram->write((checksum >> 8), checksum_location);
+ nvram->write((checksum & 0xff), checksum_location + 1);
}
-static int get_cmos_value(u32 bitnum, u32 len, void *valptr)
+void fix_options_checksum(void)
+{
+ fix_options_checksum_with(use_nvram);
+}
+
+static int get_cmos_value(const struct nvram_accessor *nvram, u32 bitnum, u32 len, void *valptr)
{
u8 *value = (u8 *)valptr;
int offs = 0;
@@ -76,7 +91,7 @@
/* Handle single byte or less */
if(len <= 8) {
- reg8 = nvram_read(addr);
+ reg8 = nvram->read(addr);
reg8 >>= bit;
value[0] = reg8 & ((1 << len) -1);
return 0;
@@ -85,13 +100,13 @@
/* When handling more than a byte, copy whole bytes */
while (len > 0) {
len -= 8;
- value[offs++]=nvram_read(addr++);
+ value[offs++]=nvram->read(addr++);
}
return 0;
}
-static int set_cmos_value(u32 bitnum, u32 len, void *valptr)
+static int set_cmos_value(const struct nvram_accessor *nvram, u32 bitnum, u32 len, void *valptr)
{
u8 *value = (u8 *)valptr;
int offs = 0;
@@ -104,17 +119,17 @@
/* Handle single byte or less */
if (len <= 8) {
- reg8 = nvram_read(addr);
+ reg8 = nvram->read(addr);
reg8 &= ~(((1 << len) - 1) << bit);
reg8 |= (value[0] & ((1 << len) - 1)) << bit;
- nvram_write(reg8, addr);
+ nvram->write(reg8, addr);
return 0;
}
/* When handling more than a byte, copy whole bytes */
while (len > 0) {
len -= 8;
- nvram_write(value[offs++], addr++);
+ nvram->write(value[offs++], addr++);
}
return 0;
@@ -139,14 +154,14 @@
return NULL;
}
-int get_option_from(struct cb_cmos_option_table *option_table, void *dest, char *name)
+int get_option_with(const struct nvram_accessor *nvram, struct cb_cmos_option_table *option_table, void *dest, char *name)
{
struct cb_cmos_entries *cmos_entry = lookup_cmos_entry(option_table, name);
if (cmos_entry) {
- if(get_cmos_value(cmos_entry->bit, cmos_entry->length, dest))
+ if(get_cmos_value(nvram, cmos_entry->bit, cmos_entry->length, dest))
return 1;
- if(!options_checksum_valid())
+ if(!options_checksum_valid(nvram))
return 1;
return 0;
@@ -154,21 +169,28 @@
return 1;
}
+int get_option_from(struct cb_cmos_option_table *option_table, void *dest, char *name)
+{
+ return get_option_with(use_nvram, option_table, dest, name);
+}
+
int get_option(void *dest, char *name)
{
- struct cb_cmos_option_table *option_table = phys_to_virt(lib_sysinfo.option_table);
- return get_option_from(option_table, dest, name);
+ return get_option_from(get_system_option_table(), dest, name);
}
-int set_option(void *value, char *name)
+int set_option_with(const struct nvram_accessor *nvram, struct cb_cmos_option_table *option_table, void *value, char *name)
{
- struct cb_cmos_option_table *option_table = phys_to_virt(lib_sysinfo.option_table);
struct cb_cmos_entries *cmos_entry = lookup_cmos_entry(option_table, name);
if (cmos_entry) {
- set_cmos_value(cmos_entry->bit, cmos_entry->length, value);
- fix_options_checksum();
+ set_cmos_value(nvram, cmos_entry->bit, cmos_entry->length, value);
+ fix_options_checksum_with(nvram);
return 0;
}
return 1;
}
+int set_option(void *value, char *name)
+{
+ return set_option_with(use_nvram, get_system_option_table(), value, name);
+}