diff options
| -rw-r--r-- | src/include/pc80/mc146818rtc.h | 2 | ||||
| -rw-r--r-- | src/pc80/mc146818rtc.c | 83 |
2 files changed, 85 insertions, 0 deletions
diff --git a/src/include/pc80/mc146818rtc.h b/src/include/pc80/mc146818rtc.h index 7be552d157..d6dcf01b77 100644 --- a/src/include/pc80/mc146818rtc.h +++ b/src/include/pc80/mc146818rtc.h @@ -109,9 +109,11 @@ static inline void cmos_write(unsigned char val, unsigned char addr) #if !defined(__ROMCC__) void rtc_init(int invalid); #if CONFIG_USE_OPTION_TABLE +int set_option(const char *name, void *val); int get_option(void *dest, const char *name); unsigned read_option_lowlevel(unsigned start, unsigned size, unsigned def); #else +static inline int set_option(const char *name __attribute__((unused)), void *val __attribute__((unused))) { return -2; }; static inline int get_option(void *dest __attribute__((unused)), const char *name __attribute__((unused))) { return -2; } static inline unsigned read_option_lowlevel(unsigned start, unsigned size, unsigned def) diff --git a/src/pc80/mc146818rtc.c b/src/pc80/mc146818rtc.c index 5850ec6784..4bbfa9ea04 100644 --- a/src/pc80/mc146818rtc.c +++ b/src/pc80/mc146818rtc.c @@ -252,4 +252,87 @@ int get_option(void *dest, const char *name) return(-4); return(0); } + +static int set_cmos_value(unsigned long bit, unsigned long length, void *vret) +{ + unsigned char *ret; + unsigned long byte,byte_bit; + unsigned long i; + unsigned char uchar, mask; + unsigned int chksum_update_needed = 0; + + ret = vret; + byte = bit / 8; /* find the byte where the data starts */ + byte_bit = bit % 8; /* find the bit in the byte where the data starts */ + if(length <= 8) { /* one byte or less */ + mask = (1 << length) - 1; + mask <<= byte_bit; + + uchar = cmos_read(byte); + uchar &= ~mask; + uchar |= (ret[0] << byte_bit); + cmos_write(uchar, byte); + if (byte >= LB_CKS_RANGE_START && byte <= LB_CKS_RANGE_END) + chksum_update_needed = 1; + } else { /* more that one byte so transfer the whole bytes */ + if (byte_bit || length % 8) + return -1; + + for(i=0; length; i++, length-=8, byte++) + cmos_write(ret[i], byte); + if (byte >= LB_CKS_RANGE_START && byte <= LB_CKS_RANGE_END) + chksum_update_needed = 1; + } + + if (chksum_update_needed) { + rtc_set_checksum(LB_CKS_RANGE_START, + LB_CKS_RANGE_END,LB_CKS_LOC); + } + return 0; +} + + +int set_option(const char *name, void *value) +{ + struct cmos_option_table *ct; + struct cmos_entries *ce; + unsigned long length; + size_t namelen; + int found=0; + + /* Figure out how long name is */ + namelen = strnlen(name, CMOS_MAX_NAME_LENGTH); + + /* find the requested entry record */ + ct=cbfs_find_file("cmos_layout.bin", CBFS_COMPONENT_CMOS_LAYOUT); + if (!ct) { + printk(BIOS_ERR, "cmos_layout.bin could not be found. Options are disabled\n"); + return(-2); + } + ce=(struct cmos_entries*)((unsigned char *)ct + ct->header_length); + for(;ce->tag==LB_TAG_OPTION; + ce=(struct cmos_entries*)((unsigned char *)ce + ce->size)) { + if (memcmp(ce->name, name, namelen) == 0) { + found=1; + break; + } + } + if(!found) { + printk(BIOS_DEBUG, "WARNING: No CMOS option '%s'.\n", name); + return(-2); + } + + length = ce->length; + if (ce->config == 's') { + length = MAX(strlen((const char *)value) * 8, ce->length - 8); + /* make sure the string is null terminated */ + if ((set_cmos_value(ce->bit + ce->length - 8, 8, &(u8[]){0}))) + return (-3); + } + + if ((set_cmos_value(ce->bit, length, value))) + return (-3); + + return 0; +} #endif /* CONFIG_USE_OPTION_TABLE */ |