libpayload: add set_option() function

It allows to change CMOS values from payloads

Change-Id: I4872fc27476923adafe13504126235b92b30de85
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/445
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

diff --git a/payloads/libpayload/drivers/options.c b/payloads/libpayload/drivers/options.c
index 394c7920ec99fb4621cc92d479f58478b632ff0c..e3f084778cb00380c2b9a8c848365ca2023cd4b5 100644 (file)
--- a/payloads/libpayload/drivers/options.c
+++ b/payloads/libpayload/drivers/options.c
@@ -91,7 +91,36 @@ static int get_cmos_value(u32 bitnum, u32 len, void *valptr)
        return 0;
 }
 
-int get_option_from(struct cb_cmos_option_table *option_table, void *dest, char *name)
+static int set_cmos_value(u32 bitnum, u32 len, void *valptr)
+{
+       u8 *value = (u8 *)valptr;
+       int offs = 0;
+       u32 addr, bit;
+       u8 reg8;
+
+       /* Convert to byte borders */
+       addr=(bitnum / 8);
+       bit=(bitnum % 8);
+
+       /* Handle single byte or less */
+       if (len <= 8) {
+               reg8 = nvram_read(addr);
+               reg8 &= ~(((1 << len) - 1) << bit);
+               reg8 |= (value[0] & ((1 << len) - 1)) << bit;
+               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++);
+       }
+
+       return 0;
+}
+
+static struct cb_cmos_entries *lookup_cmos_entry(struct cb_cmos_option_table *option_table, char *name)
 {
        struct cb_cmos_entries *cmos_entry;
        int len = strnlen(name, CMOS_MAX_NAME_LENGTH);
@@ -103,6 +132,17 @@ int get_option_from(struct cb_cmos_option_table *option_table, void *dest, char
                cmos_entry = (struct cb_cmos_entries*)((unsigned char *)cmos_entry + cmos_entry->size)) {
                if (memcmp((const char*)cmos_entry->name, name, len))
                        continue;
+               return cmos_entry;
+       }
+
+       printf("ERROR: No such CMOS option (%s)\n", name);
+       return NULL;
+}
+
+int get_option_from(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))
                        return 1;
 
@@ -111,8 +151,6 @@ int get_option_from(struct cb_cmos_option_table *option_table, void *dest, char
 
                return 0;
        }
-
-       printf("ERROR: No such CMOS option (%s)\n", name);
        return 1;
 }
 
@@ -121,3 +159,16 @@ 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);
 }
+
+int set_option(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();
+               return 0;
+       }
+       return 1;
+}
+

diff --git a/payloads/libpayload/include/libpayload.h b/payloads/libpayload/include/libpayload.h
index 0e892c80cd3e806a9dae418e063bdf22f06ba118..8c8abc437ed822b736f59d710e36a3f36696ed1c 100644 (file)
--- a/payloads/libpayload/include/libpayload.h
+++ b/payloads/libpayload/include/libpayload.h
@@ -197,6 +197,7 @@ void video_console_set_cursor(unsigned int cursorx, unsigned int cursory);
 void fix_options_checksum(void);
 int get_option_from(struct cb_cmos_option_table *option_table, void *dest, char *name);
 int get_option(void *dest, char *name);
+int set_option(void *value, char *name);
 
 /**
  * @defgroup console Console functions