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Diffstat (limited to '')
| -rw-r--r-- | include/grub/cmos.h | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/include/grub/cmos.h b/include/grub/cmos.h new file mode 100644 index 0000000..56ccc71 --- /dev/null +++ b/include/grub/cmos.h @@ -0,0 +1,128 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2008, 2009 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef GRUB_CMOS_H +#define GRUB_CMOS_H 1 + +#include <grub/types.h> +#if !defined (__powerpc__) && !defined (__sparc__) +#include <grub/cpu/io.h> +#include <grub/cpu/cmos.h> +#endif + +#define GRUB_CMOS_INDEX_SECOND 0 +#define GRUB_CMOS_INDEX_SECOND_ALARM 1 +#define GRUB_CMOS_INDEX_MINUTE 2 +#define GRUB_CMOS_INDEX_MINUTE_ALARM 3 +#define GRUB_CMOS_INDEX_HOUR 4 +#define GRUB_CMOS_INDEX_HOUR_ALARM 5 +#define GRUB_CMOS_INDEX_DAY_OF_WEEK 6 +#define GRUB_CMOS_INDEX_DAY_OF_MONTH 7 +#define GRUB_CMOS_INDEX_MONTH 8 +#define GRUB_CMOS_INDEX_YEAR 9 + +#define GRUB_CMOS_INDEX_STATUS_A 0xA +#define GRUB_CMOS_INDEX_STATUS_B 0xB +#define GRUB_CMOS_INDEX_STATUS_C 0xC +#define GRUB_CMOS_INDEX_STATUS_D 0xD + +#define GRUB_CMOS_STATUS_B_DAYLIGHT 1 +#define GRUB_CMOS_STATUS_B_24HOUR 2 +#define GRUB_CMOS_STATUS_B_BINARY 4 + +static inline grub_uint8_t +grub_bcd_to_num (grub_uint8_t a) +{ + return ((a >> 4) * 10 + (a & 0xF)); +} + +static inline grub_uint8_t +grub_num_to_bcd (grub_uint8_t a) +{ + return (((a / 10) << 4) + (a % 10)); +} + +#if !defined (__powerpc__) && !defined (__sparc__) +static inline grub_err_t +grub_cmos_read (grub_uint8_t index, grub_uint8_t *val) +{ + if (index & 0x80) + { + grub_outb (index & 0x7f, GRUB_CMOS_ADDR_REG_HI); + *val = grub_inb (GRUB_CMOS_DATA_REG_HI); + } + else + { + grub_outb (index & 0x7f, GRUB_CMOS_ADDR_REG); + *val = grub_inb (GRUB_CMOS_DATA_REG); + } + return GRUB_ERR_NONE; +} + +static inline grub_err_t +grub_cmos_write (grub_uint8_t index, grub_uint8_t value) +{ + if (index & 0x80) + { + grub_outb (index & 0x7f, GRUB_CMOS_ADDR_REG_HI); + grub_outb (value, GRUB_CMOS_DATA_REG_HI); + } + else + { + grub_outb (index & 0x7f, GRUB_CMOS_ADDR_REG); + grub_outb (value, GRUB_CMOS_DATA_REG); + } + return GRUB_ERR_NONE; +} +#else +grub_err_t grub_cmos_find_port (void); +extern volatile grub_uint8_t *grub_cmos_port; + +static inline grub_err_t +grub_cmos_read (grub_uint8_t index, grub_uint8_t *val) +{ + if (!grub_cmos_port) + { + grub_err_t err; + err = grub_cmos_find_port (); + if (err) + return err; + } + grub_cmos_port[((index & 0x80) >> 6) | 0] = index & 0x7f; + *val = grub_cmos_port[((index & 0x80) >> 6) | 1]; + return GRUB_ERR_NONE; +} + +static inline grub_err_t +grub_cmos_write (grub_uint8_t index, grub_uint8_t val) +{ + if (!grub_cmos_port) + { + grub_err_t err; + err = grub_cmos_find_port (); + if (err) + return err; + } + grub_cmos_port[((index & 0x80) >> 6) | 0] = index; + grub_cmos_port[((index & 0x80) >> 6) | 1] = val; + return GRUB_ERR_NONE; +} + +#endif + +#endif /* GRUB_CMOS_H */ |