diff options
Diffstat (limited to 'src/nvram.c')
| -rw-r--r-- | src/nvram.c | 450 |
1 files changed, 450 insertions, 0 deletions
diff --git a/src/nvram.c b/src/nvram.c new file mode 100644 index 0000000..58d63df --- /dev/null +++ b/src/nvram.c @@ -0,0 +1,450 @@ +/* + * <nvram.c> + * + * Open Hack'Ware BIOS NVRAM management routines. + * + * Copyright (c) 2004-2005 Jocelyn Mayer + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License V2 + * as published by the Free Software Foundation + * + * This program 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 this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <stdlib.h> +#include <stdio.h> +#include "bios.h" + +#define NVRAM_MAX_SIZE 0x2000 +#define NVRAM_IO_BASE 0x0074 + +struct nvram_t { + uint16_t io_base; + uint16_t size; +}; + +/* NVRAM access */ +static void NVRAM_set_byte (nvram_t *nvram, uint32_t addr, uint8_t value) +{ + NVRAM_write(nvram, addr, value); +} + +static uint8_t NVRAM_get_byte (nvram_t *nvram, uint16_t addr) +{ + return NVRAM_read(nvram, addr); +} + +static void NVRAM_set_word (nvram_t *nvram, uint16_t addr, uint16_t value) +{ + NVRAM_write(nvram, addr, value >> 8); + NVRAM_write(nvram, addr + 1, value); +} + +static uint16_t NVRAM_get_word (nvram_t *nvram, uint16_t addr) +{ + uint16_t tmp; + + tmp = NVRAM_read(nvram, addr) << 8; + tmp |= NVRAM_read(nvram, addr + 1); + + return tmp; +} + +static void NVRAM_set_lword (nvram_t *nvram, uint16_t addr, uint32_t value) +{ + NVRAM_write(nvram, addr, value >> 24); + NVRAM_write(nvram, addr + 1, value >> 16); + NVRAM_write(nvram, addr + 2, value >> 8); + NVRAM_write(nvram, addr + 3, value); +} + +static uint32_t NVRAM_get_lword (nvram_t *nvram, uint16_t addr) +{ + uint32_t tmp; + + tmp = NVRAM_read(nvram, addr) << 24; + tmp |= NVRAM_read(nvram, addr + 1) << 16; + tmp |= NVRAM_read(nvram, addr + 2) << 8; + tmp |= NVRAM_read(nvram, addr + 3); + + return tmp; +} + +static void NVRAM_set_string (nvram_t *nvram, uint32_t addr, + const unsigned char *str, uint32_t max) +{ + uint32_t i; + + for (i = 0; i < max && str[i] != '\0'; i++) { + NVRAM_write(nvram, addr + i, str[i]); + } + NVRAM_write(nvram, addr + i, '\0'); +} + +static int NVRAM_get_string (nvram_t *nvram, uint8_t *dst, + uint16_t addr, int max) +{ + int i; + + memset(dst, 0, max); + for (i = 0; i < max; i++) { + dst[i] = NVRAM_get_byte(nvram, addr + i); + if (dst[i] == '\0') + break; + } + + return i; +} + +static uint16_t NVRAM_crc_update (uint16_t prev, uint16_t value) +{ + uint16_t tmp; + uint16_t pd, pd1, pd2; + + tmp = prev >> 8; + pd = prev ^ value; + pd1 = pd & 0x000F; + pd2 = ((pd >> 4) & 0x000F) ^ pd1; + tmp ^= (pd1 << 3) | (pd1 << 8); + tmp ^= pd2 | (pd2 << 7) | (pd2 << 12); + + return tmp; +} + +static uint16_t NVRAM_compute_crc (nvram_t *nvram, + uint32_t start, uint32_t count) +{ + uint32_t i; + uint16_t crc = 0xFFFF; + int odd; + + odd = count & 1; + count &= ~1; + for (i = 0; i != count; i++) { + crc = NVRAM_crc_update(crc, NVRAM_get_word(nvram, start + i)); + } + if (odd) { + crc = NVRAM_crc_update(crc, NVRAM_get_byte(nvram, start + i) << 8); + } + + return crc; +} + +/* Format NVRAM for PREP target */ +static int NVRAM_prep_format (nvram_t *nvram) +{ +#define NVRAM_PREP_OSAREA_SIZE 512 +#define NVRAM_PREP_CONFSIZE 1024 + uint16_t crc; + + /* NVRAM header */ + /* 0x00: NVRAM size in kB */ + NVRAM_set_word(nvram, 0x00, nvram->size >> 10); + /* 0x02: NVRAM version */ + NVRAM_set_byte(nvram, 0x02, 0x01); + /* 0x03: NVRAM revision */ + NVRAM_set_byte(nvram, 0x03, 0x01); + /* 0x08: last OS */ + NVRAM_set_byte(nvram, 0x08, 0x00); /* Unknown */ + /* 0x09: endian */ + NVRAM_set_byte(nvram, 0x09, 'B'); /* Big-endian */ + /* 0x0A: OSArea usage */ + NVRAM_set_byte(nvram, 0x0A, 0x00); /* Empty */ + /* 0x0B: PM mode */ + NVRAM_set_byte(nvram, 0x0B, 0x00); /* Normal */ + /* Restart block description record */ + /* 0x0C: restart block version */ + NVRAM_set_word(nvram, 0x0C, 0x01); + /* 0x0E: restart block revision */ + NVRAM_set_word(nvram, 0x0E, 0x01); + /* 0x20: restart address */ + NVRAM_set_lword(nvram, 0x20, 0x00); + /* 0x24: save area address */ + NVRAM_set_lword(nvram, 0x24, 0x00); + /* 0x28: save area length */ + NVRAM_set_lword(nvram, 0x28, 0x00); + /* 0x1C: checksum of restart block */ + crc = NVRAM_compute_crc(nvram, 0x0C, 32); + NVRAM_set_word(nvram, 0x1C, crc); + + /* Security section */ + /* Set all to zero */ + /* 0xC4: pointer to global environment area */ + NVRAM_set_lword(nvram, 0xC4, 0x0100); + /* 0xC8: size of global environment area */ + NVRAM_set_lword(nvram, 0xC8, nvram->size - NVRAM_PREP_OSAREA_SIZE - + NVRAM_PREP_CONFSIZE - 0x0100); + /* 0xD4: pointer to configuration area */ + NVRAM_set_lword(nvram, 0xD4, nvram->size - NVRAM_PREP_CONFSIZE); + /* 0xD8: size of configuration area */ + NVRAM_set_lword(nvram, 0xD8, NVRAM_PREP_CONFSIZE); + /* 0xE8: pointer to OS specific area */ + NVRAM_set_lword(nvram, 0xE8, nvram->size - NVRAM_PREP_CONFSIZE + - NVRAM_PREP_OSAREA_SIZE); + /* 0xD8: size of OS specific area */ + NVRAM_set_lword(nvram, 0xEC, NVRAM_PREP_OSAREA_SIZE); + + /* Configuration area */ + + /* 0x04: checksum 0 => OS area */ + crc = NVRAM_compute_crc(nvram, 0x00, nvram->size - NVRAM_PREP_CONFSIZE - + NVRAM_PREP_OSAREA_SIZE); + NVRAM_set_word(nvram, 0x04, crc); + /* 0x06: checksum of config area */ + crc = NVRAM_compute_crc(nvram, nvram->size - NVRAM_PREP_CONFSIZE, + NVRAM_PREP_CONFSIZE); + NVRAM_set_word(nvram, 0x06, crc); + + return 0; +} + +static uint8_t NVRAM_chrp_chksum (nvram_t *nvram, uint16_t pos) +{ + uint16_t sum, end; + + end = pos + 0x10; + sum = NVRAM_get_byte(nvram, pos); + for (pos += 2; pos < end; pos++) { + sum += NVRAM_get_byte(nvram, pos); + } + while (sum > 0xFF) { + sum = (sum & 0xFF) + (sum >> 8); + } + + return sum; +} + +static int NVRAM_chrp_format (unused nvram_t *nvram) +{ + uint8_t chksum; + + /* Mark NVRAM as free */ + NVRAM_set_byte(nvram, 0x00, 0x5A); + NVRAM_set_byte(nvram, 0x01, 0x00); + NVRAM_set_word(nvram, 0x02, 0x2000); + NVRAM_set_string(nvram, 0x04, "wwwwwwwwwwww", 12); + chksum = NVRAM_chrp_chksum(nvram, 0x00); + NVRAM_set_byte(nvram, 0x01, chksum); + + return 0; +} + +#if 0 +static uint16_t NVRAM_mac99_chksum (nvram_t *nvram, + uint16_t start, uint16_t len) + int cnt; + u32 low, high; + + buffer += CORE99_ADLER_START; + low = 1; + high = 0; + for (cnt=0; cnt<(NVRAM_SIZE-CORE99_ADLER_START); cnt++) { + if ((cnt % 5000) == 0) { + high %= 65521UL; + high %= 65521UL; + } + low += buffer[cnt]; + high += low; + } + low %= 65521UL; + high %= 65521UL; + + return (high << 16) | low; +{ + uint16_t pos; + uint8_t tmp, sum; + + sum = 0; + for (pos = start; pos < (start + len); pos++) { + tmp = sum + NVRAM_get_byte(nvram, pos); + if (tmp < sum) + tmp++; + sum = tmp; + } + + return sum; +} +#endif + +static int NVRAM_mac99_format (nvram_t *nvram) +{ + uint8_t chksum; + + /* Mark NVRAM as free */ + NVRAM_set_byte(nvram, 0x00, 0x5A); + NVRAM_set_byte(nvram, 0x01, 0x00); + NVRAM_set_word(nvram, 0x02, 0x2000); + NVRAM_set_string(nvram, 0x04, "wwwwwwwwwwww", 12); + chksum = NVRAM_chrp_chksum(nvram, 0x00); + NVRAM_set_byte(nvram, 0x01, chksum); + + return 0; +} + +static int NVRAM_pop_format (unused nvram_t *nvram) +{ + /* TODO */ + return -1; +} + +/* Interface */ +uint8_t NVRAM_read (nvram_t *nvram, uint32_t addr) +{ + outb(nvram->io_base + 0x00, addr); + outb(nvram->io_base + 0x01, addr >> 8); + + return inb(NVRAM_IO_BASE + 0x03); +} + +void NVRAM_write (nvram_t *nvram, uint32_t addr, uint8_t value) +{ + outb(nvram->io_base + 0x00, addr); + outb(nvram->io_base + 0x01, addr >> 8); + outb(nvram->io_base + 0x03, value); +} + +uint16_t NVRAM_get_size (nvram_t *nvram) +{ + return nvram->size; +} + +int NVRAM_format (nvram_t *nvram) +{ + int ret; + + { + uint16_t pos; + + for (pos = 0; pos < nvram->size; pos += 4) + NVRAM_set_lword(nvram, pos, 0); + } + switch (arch) { + case ARCH_PREP: + ret = NVRAM_prep_format(nvram); + break; + case ARCH_CHRP: + ret = NVRAM_chrp_format(nvram); + break; + case ARCH_MAC99: + ret = NVRAM_mac99_format(nvram); + break; + case ARCH_POP: + ret = NVRAM_pop_format(nvram); + break; + default: + ret = -1; + break; + } + + return ret; +} + +/* HACK... */ +extern int vga_width, vga_height, vga_depth; + +static nvram_t global_nvram; + +nvram_t *NVRAM_get_config (uint32_t *RAM_size, int *boot_device, + void **boot_image, uint32_t *boot_size, + void **cmdline, uint32_t *cmdline_size, + void **ramdisk, uint32_t *ramdisk_size) +{ + unsigned char sign[16]; + nvram_t *nvram; + uint32_t lword; + uint16_t NVRAM_size, crc; + uint8_t byte; + +#if 0 + nvram = malloc(sizeof(nvram_t)); + if (nvram == NULL) + return NULL; +#else + nvram = &global_nvram; +#endif + nvram->io_base = NVRAM_IO_BASE; + /* Pre-initialised NVRAM is not supported any more */ + if (NVRAM_get_string(nvram, sign, 0x00, 0x10) <= 0 || + strcmp(sign, "QEMU_BIOS") != 0) { + ERROR("Wrong NVRAM signature %s\n", sign); + return NULL; + } + /* Check structure version */ + lword = NVRAM_get_lword(nvram, 0x10); + if (lword != 0x00000002) { + ERROR("Wrong NVRAM structure version: %0x\n", lword); + return NULL; + } + /* Check CRC */ + crc = NVRAM_compute_crc(nvram, 0x00, 0xF8); + if (NVRAM_get_word(nvram, 0xFC) != crc) { + ERROR("Invalid NVRAM structure CRC: %0x <=> %0x\n", crc, + NVRAM_get_word(nvram, 0xFC)); + return NULL; + } + NVRAM_size = NVRAM_get_word(nvram, 0x14); + if ((NVRAM_size & 0x100) != 0x00 || NVRAM_size < 0x400 || + NVRAM_size > 0x2000) { + ERROR("Invalid NVRAM size: %d\n", NVRAM_size); + return NULL; + } + nvram->size = NVRAM_size; + if (NVRAM_get_string(nvram, sign, 0x20, 0x10) < 0) { + ERROR("Unable to get architecture from NVRAM\n"); + return NULL; + } + if (strcmp(sign, "PREP") == 0) { + arch = ARCH_PREP; + } else if (strcmp(sign, "CHRP") == 0) { + arch = ARCH_CHRP; + } else if (strcmp(sign, "MAC99") == 0) { + arch = ARCH_MAC99; + } else if (strcmp(sign, "POP") == 0) { + arch = ARCH_POP; + } else { + ERROR("Unknown PPC architecture: '%s'\n", sign); + return NULL; + } + /* HACK */ + if (arch == ARCH_CHRP) + arch = ARCH_MAC99; + lword = NVRAM_get_lword(nvram, 0x30); + *RAM_size = lword; + byte = NVRAM_get_byte(nvram, 0x34); + *boot_device = byte; + /* Preloaded boot image */ + lword = NVRAM_get_lword(nvram, 0x38); + *boot_image = (void *)lword; + lword = NVRAM_get_lword(nvram, 0x3C); + *boot_size = lword; + /* Preloaded cmdline */ + lword = NVRAM_get_lword(nvram, 0x40); + *cmdline = (void *)lword; + lword = NVRAM_get_lword(nvram, 0x44); + *cmdline_size = lword; + /* Preloaded RAM disk */ + lword = NVRAM_get_lword(nvram, 0x48); + *ramdisk = (void *)lword; + lword = NVRAM_get_lword(nvram, 0x4C); + *ramdisk_size = lword; + /* Preloaded NVRAM image */ + lword = NVRAM_get_lword(nvram, 0x50); + /* Display init geometry */ + lword = NVRAM_get_word(nvram, 0x54); + vga_width = lword; + lword = NVRAM_get_word(nvram, 0x56); + vga_height = lword; + lword = NVRAM_get_word(nvram, 0x58); + vga_depth = lword; + /* TODO: write it into NVRAM */ + + return nvram; +} |