diff options
Diffstat (limited to 'contrib/syslinux-4.02/memdisk/setup.c')
| -rw-r--r-- | contrib/syslinux-4.02/memdisk/setup.c | 1189 |
1 files changed, 1189 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/memdisk/setup.c b/contrib/syslinux-4.02/memdisk/setup.c new file mode 100644 index 0000000..3f69cd3 --- /dev/null +++ b/contrib/syslinux-4.02/memdisk/setup.c @@ -0,0 +1,1189 @@ +/* ----------------------------------------------------------------------- * + * + * Copyright 2001-2009 H. Peter Anvin - All Rights Reserved + * Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin + * Portions copyright 2009-2010 Shao Miller + * [El Torito code, mBFT, "safe hook"] + * + * This program 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, Inc., 53 Temple Place Ste 330, + * Boston MA 02111-1307, USA; either version 2 of the License, or + * (at your option) any later version; incorporated herein by reference. + * + * ----------------------------------------------------------------------- */ + +#include <stdint.h> +#include "bda.h" +#include "dskprobe.h" +#include "e820.h" +#include "conio.h" +#include "version.h" +#include "memdisk.h" +#include "../version.h" + +const char memdisk_version[] = "MEMDISK " VERSION_STR " " DATE; +const char copyright[] = + "Copyright " FIRSTYEAR "-" YEAR_STR " H. Peter Anvin et al"; + +extern const char _binary_memdisk_chs_512_bin_start[]; +extern const char _binary_memdisk_chs_512_bin_end[]; +extern const char _binary_memdisk_chs_512_bin_size[]; +extern const char _binary_memdisk_edd_512_bin_start[]; +extern const char _binary_memdisk_edd_512_bin_end[]; +extern const char _binary_memdisk_edd_512_bin_size[]; +extern const char _binary_memdisk_iso_512_bin_start[]; +extern const char _binary_memdisk_iso_512_bin_end[]; +extern const char _binary_memdisk_iso_512_bin_size[]; +extern const char _binary_memdisk_iso_2048_bin_start[]; +extern const char _binary_memdisk_iso_2048_bin_end[]; +extern const char _binary_memdisk_iso_2048_bin_size[]; + +/* Pull in structures common to MEMDISK and MDISKCHK.COM */ +#include "mstructs.h" + +/* An EDD disk packet */ +struct edd_dsk_pkt { + uint8_t size; /* Packet size */ + uint8_t res1; /* Reserved */ + uint16_t count; /* Count to transfer */ + uint32_t buf; /* Buffer pointer */ + uint64_t start; /* LBA to start from */ + uint64_t buf64; /* 64-bit buf pointer */ +} __attribute__ ((packed)); + +/* Change to 1 for El Torito debugging */ +#define DBG_ELTORITO 0 + +#if DBG_ELTORITO +extern void eltorito_dump(uint32_t); +#endif + +/* + * Routine to seek for a command-line item and return a pointer + * to the data portion, if present + */ + +/* Magic return values */ +#define CMD_NOTFOUND ((char *)-1) /* Not found */ +#define CMD_BOOL ((char *)-2) /* Found boolean option */ +#define CMD_HASDATA(X) ((int)(X) >= 0) + +static const char *getcmditem(const char *what) +{ + const char *p; + const char *wp = what; + int match = 0; + + for (p = shdr->cmdline; *p; p++) { + switch (match) { + case 0: /* Ground state */ + if (*p == ' ') + break; + + wp = what; + match = 1; + /* Fall through */ + + case 1: /* Matching */ + if (*wp == '\0') { + if (*p == '=') + return p + 1; + else if (*p == ' ') + return CMD_BOOL; + else { + match = 2; + break; + } + } + if (*p != *wp++) + match = 2; + break; + + case 2: /* Mismatch, skip rest of option */ + if (*p == ' ') + match = 0; /* Next option */ + break; + } + } + + /* Check for matching string at end of line */ + if (match == 1 && *wp == '\0') + return CMD_BOOL; + + return CMD_NOTFOUND; +} + +/* + * Check to see if this is a gzip image + */ +#define UNZIP_ALIGN 512 + +extern void _end; /* Symbol signalling end of data */ + +void unzip_if_needed(uint32_t * where_p, uint32_t * size_p) +{ + uint32_t where = *where_p; + uint32_t size = *size_p; + uint32_t zbytes; + uint32_t startrange, endrange; + uint32_t gzdatasize, gzwhere; + uint32_t orig_crc, offset; + uint32_t target = 0; + int i, okmem; + + /* Is it a gzip image? */ + if (check_zip((void *)where, size, &zbytes, &gzdatasize, + &orig_crc, &offset) == 0) { + + if (offset + zbytes > size) { + /* + * Assertion failure; check_zip is supposed to guarantee this + * never happens. + */ + die("internal error: check_zip returned nonsense\n"); + } + + /* + * Find a good place to put it: search memory ranges in descending + * order until we find one that is legal and fits + */ + okmem = 0; + for (i = nranges - 1; i >= 0; i--) { + /* + * We can't use > 4G memory (32 bits only.) Truncate to 2^32-1 + * so we don't have to deal with funny wraparound issues. + */ + + /* Must be memory */ + if (ranges[i].type != 1) + continue; + + /* Range start */ + if (ranges[i].start >= 0xFFFFFFFF) + continue; + + startrange = (uint32_t) ranges[i].start; + + /* Range end (0 for end means 2^64) */ + endrange = ((ranges[i + 1].start >= 0xFFFFFFFF || + ranges[i + 1].start == 0) + ? 0xFFFFFFFF : (uint32_t) ranges[i + 1].start); + + /* Make sure we don't overwrite ourselves */ + if (startrange < (uint32_t) & _end) + startrange = (uint32_t) & _end; + + /* Allow for alignment */ + startrange = + (ranges[i].start + (UNZIP_ALIGN - 1)) & ~(UNZIP_ALIGN - 1); + + /* In case we just killed the whole range... */ + if (startrange >= endrange) + continue; + + /* + * Must be large enough... don't rely on gzwhere for this + * (wraparound) + */ + if (endrange - startrange < gzdatasize) + continue; + + /* + * This is where the gz image would be put if we put it in this + * range... + */ + gzwhere = (endrange - gzdatasize) & ~(UNZIP_ALIGN - 1); + + /* Cast to uint64_t just in case we're flush with the top byte */ + if ((uint64_t) where + size >= gzwhere && where < endrange) { + /* + * Need to move source data to avoid compressed/uncompressed + * overlap + */ + uint32_t newwhere; + + if (gzwhere - startrange < size) + continue; /* Can't fit both old and new */ + + newwhere = (gzwhere - size) & ~(UNZIP_ALIGN - 1); + printf("Moving compressed data from 0x%08x to 0x%08x\n", + where, newwhere); + + memmove((void *)newwhere, (void *)where, size); + where = newwhere; + } + + target = gzwhere; + okmem = 1; + break; + } + + if (!okmem) + die("Not enough memory to decompress image (need 0x%08x bytes)\n", + gzdatasize); + + printf("gzip image: decompressed addr 0x%08x, len 0x%08x: ", + target, gzdatasize); + + *size_p = gzdatasize; + *where_p = (uint32_t) unzip((void *)(where + offset), zbytes, + gzdatasize, orig_crc, (void *)target); + } +} + +/* + * Figure out the "geometry" of the disk in question + */ +struct geometry { + uint32_t sectors; /* Sector count */ + uint32_t c, h, s; /* C/H/S geometry */ + uint32_t offset; /* Byte offset for disk */ + uint32_t boot_lba; /* LBA of bootstrap code */ + uint8_t type; /* Type byte for INT 13h AH=08h */ + uint8_t driveno; /* Drive no */ + uint8_t sector_shift; /* Sector size as a power of 2 */ + const char *hsrc, *ssrc; /* Origins of H and S geometries */ +}; + +/* Format of a DOS partition table entry */ +struct ptab_entry { + uint8_t active; + uint8_t start_h, start_s, start_c; + uint8_t type; + uint8_t end_h, end_s, end_c; + uint32_t start; + uint32_t size; +} __attribute__ ((packed)); + +/* Format of a FAT filesystem superblock */ +struct fat_extra { + uint8_t bs_drvnum; + uint8_t bs_resv1; + uint8_t bs_bootsig; + uint32_t bs_volid; + char bs_vollab[11]; + char bs_filsystype[8]; +} __attribute__ ((packed)); +struct fat_super { + uint8_t bs_jmpboot[3]; + char bs_oemname[8]; + uint16_t bpb_bytspersec; + uint8_t bpb_secperclus; + uint16_t bpb_rsvdseccnt; + uint8_t bpb_numfats; + uint16_t bpb_rootentcnt; + uint16_t bpb_totsec16; + uint8_t bpb_media; + uint16_t bpb_fatsz16; + uint16_t bpb_secpertrk; + uint16_t bpb_numheads; + uint32_t bpb_hiddsec; + uint32_t bpb_totsec32; + union { + struct { + struct fat_extra extra; + } fat16; + struct { + uint32_t bpb_fatsz32; + uint16_t bpb_extflags; + uint16_t bpb_fsver; + uint32_t bpb_rootclus; + uint16_t bpb_fsinfo; + uint16_t bpb_bkbootsec; + char bpb_reserved[12]; + /* Clever, eh? Same fields, different offset... */ + struct fat_extra extra; + } fat32 __attribute__ ((packed)); + } x; +} __attribute__ ((packed)); + +/* Format of a DOSEMU header */ +struct dosemu_header { + uint8_t magic[7]; /* DOSEMU\0 */ + uint32_t h; + uint32_t s; + uint32_t c; + uint32_t offset; + uint8_t pad[105]; +} __attribute__ ((packed)); + +#define FOUR(a,b,c,d) (((a) << 24)|((b) << 16)|((c) << 8)|(d)) + +static const struct geometry *get_disk_image_geometry(uint32_t where, + uint32_t size) +{ + static struct geometry hd_geometry; + struct dosemu_header dosemu; + unsigned int sectors, xsectors, v; + unsigned int offset; + int i; + const char *p; + + printf("command line: %s\n", shdr->cmdline); + + hd_geometry.sector_shift = 9; /* Assume floppy/HDD at first */ + + offset = 0; + if (CMD_HASDATA(p = getcmditem("offset")) && (v = atou(p))) + offset = v; + + sectors = xsectors = (size - offset) >> hd_geometry.sector_shift; + + hd_geometry.hsrc = "guess"; + hd_geometry.ssrc = "guess"; + hd_geometry.sectors = sectors; + hd_geometry.offset = offset; + + if ((p = getcmditem("iso")) != CMD_NOTFOUND) { +#if DBG_ELTORITO + eltorito_dump(where); +#endif + struct edd4_bvd *bvd = (struct edd4_bvd *)(where + 17 * 2048); + /* Tiny sanity check */ + if ((bvd->boot_rec_ind != 0) || (bvd->ver != 1)) + printf("El Torito BVD sanity check failed.\n"); + struct edd4_bootcat *boot_cat = + (struct edd4_bootcat *)(where + bvd->boot_cat * 2048); + /* Another tiny sanity check */ + if ((boot_cat->validation_entry.platform_id != 0) || + (boot_cat->validation_entry.key55 != 0x55) || + (boot_cat->validation_entry.keyAA != 0xAA)) + printf("El Torito boot catalog sanity check failed.\n"); + /* If we have an emulation mode, set the offset to the image */ + if (boot_cat->initial_entry.media_type) + hd_geometry.offset += boot_cat->initial_entry.load_block * 2048; + else + /* We're a no-emulation mode, so we will boot to an offset */ + hd_geometry.boot_lba = boot_cat->initial_entry.load_block * 4; + if (boot_cat->initial_entry.media_type < 4) { + /* We're a floppy emulation mode or our params will be + * overwritten by the no emulation mode case + */ + hd_geometry.driveno = 0x00; + hd_geometry.c = 80; + hd_geometry.h = 2; + } + switch (boot_cat->initial_entry.media_type) { + case 0: /* No emulation */ + hd_geometry.driveno = 0xE0; + hd_geometry.type = 10; /* ATAPI removable media device */ + hd_geometry.c = 65535; + hd_geometry.h = 255; + hd_geometry.s = 15; + /* 2048-byte sectors, so adjust the size and count */ + hd_geometry.sector_shift = 11; + break; + case 1: /* 1.2 MB floppy */ + hd_geometry.s = 15; + hd_geometry.type = 2; + sectors = 2400; + break; + case 2: /* 1.44 MB floppy */ + hd_geometry.s = 18; + hd_geometry.type = 4; + sectors = 2880; + break; + case 3: /* 2.88 MB floppy */ + hd_geometry.s = 36; + hd_geometry.type = 6; + sectors = 5760; + break; + case 4: + hd_geometry.driveno = 0x80; + hd_geometry.type = 0; + break; + } + sectors = (size - hd_geometry.offset) >> hd_geometry.sector_shift; + + /* For HDD emulation, we figure out the geometry later. Otherwise: */ + if (hd_geometry.s) { + hd_geometry.hsrc = hd_geometry.ssrc = "El Torito"; + } + hd_geometry.sectors = sectors; + } + + /* Do we have a DOSEMU header? */ + memcpy(&dosemu, (char *)where + hd_geometry.offset, sizeof dosemu); + if (!memcmp("DOSEMU", dosemu.magic, 7)) { + /* Always a hard disk unless overruled by command-line options */ + hd_geometry.driveno = 0x80; + hd_geometry.type = 0; + hd_geometry.c = dosemu.c; + hd_geometry.h = dosemu.h; + hd_geometry.s = dosemu.s; + hd_geometry.offset += dosemu.offset; + sectors = (size - hd_geometry.offset) >> hd_geometry.sector_shift; + + hd_geometry.hsrc = hd_geometry.ssrc = "DOSEMU"; + } + + if (CMD_HASDATA(p = getcmditem("c")) && (v = atou(p))) + hd_geometry.c = v; + if (CMD_HASDATA(p = getcmditem("h")) && (v = atou(p))) { + hd_geometry.h = v; + hd_geometry.hsrc = "cmd"; + } + if (CMD_HASDATA(p = getcmditem("s")) && (v = atou(p))) { + hd_geometry.s = v; + hd_geometry.ssrc = "cmd"; + } + + if (!hd_geometry.h || !hd_geometry.s) { + int h, s, max_h, max_s; + + max_h = hd_geometry.h; + max_s = hd_geometry.s; + + if (!(max_h | max_s)) { + /* Look for a FAT superblock and if we find something that looks + enough like one, use geometry from that. This takes care of + megafloppy images and unpartitioned hard disks. */ + const struct fat_extra *extra = NULL; + const struct fat_super *fs = (const struct fat_super *) + ((char *)where + hd_geometry.offset); + + if ((fs->bpb_media == 0xf0 || fs->bpb_media >= 0xf8) && + (fs->bs_jmpboot[0] == 0xe9 || fs->bs_jmpboot[0] == 0xeb) && + fs->bpb_bytspersec == 512 && + fs->bpb_numheads >= 1 && fs->bpb_numheads <= 256 && + fs->bpb_secpertrk >= 1 && fs->bpb_secpertrk <= 63) { + extra = + fs->bpb_fatsz16 ? &fs->x.fat16.extra : &fs->x.fat32.extra; + if (! + (extra->bs_bootsig == 0x29 && extra->bs_filsystype[0] == 'F' + && extra->bs_filsystype[1] == 'A' + && extra->bs_filsystype[2] == 'T')) + extra = NULL; + } + if (extra) { + hd_geometry.driveno = extra->bs_drvnum & 0x80; + max_h = fs->bpb_numheads; + max_s = fs->bpb_secpertrk; + hd_geometry.hsrc = hd_geometry.ssrc = "FAT"; + } + } + + if (!(max_h | max_s)) { + /* No FAT filesystem found to steal geometry from... */ + if ((sectors < 4096 * 2) && (hd_geometry.sector_shift == 9)) { + int ok = 0; + unsigned int xsectors = sectors; + + hd_geometry.driveno = 0; /* Assume floppy */ + + while (!ok) { + /* Assume it's a floppy drive, guess a geometry */ + unsigned int type, track; + int c, h, s = 0; + + if (xsectors < 320 * 2) { + c = 40; + h = 1; + type = 1; + } else if (xsectors < 640 * 2) { + c = 40; + h = 2; + type = 1; + } else if (xsectors < 1200 * 2) { + c = 80; + h = 2; + type = 3; + } else if (xsectors < 1440 * 2) { + c = 80; + h = 2; + type = 2; + } else if (xsectors < 2880 * 2) { + c = 80; + h = 2; + type = 4; + } else { + c = 80; + h = 2; + type = 6; + } + track = c * h; + while (c < 256) { + s = xsectors / track; + if (s < 63 && (xsectors % track) == 0) { + ok = 1; + break; + } + c++; + track += h; + } + if (ok) { + max_h = h; + max_s = s; + hd_geometry.hsrc = hd_geometry.ssrc = "fd"; + } else { + /* No valid floppy geometry, fake it by simulating broken + sectors at the end of the image... */ + xsectors++; + } + } + } else { + /* Assume it is a hard disk image and scan for a partition table */ + const struct ptab_entry *ptab = (const struct ptab_entry *) + ((char *)where + hd_geometry.offset + (512 - 2 - 4 * 16)); + + /* Assume hard disk */ + if (!hd_geometry.driveno) + hd_geometry.driveno = 0x80; + + if (*(uint16_t *) ((char *)where + hd_geometry.offset + 512 - 2) == 0xaa55) { + for (i = 0; i < 4; i++) { + if (ptab[i].type && !(ptab[i].active & 0x7f)) { + s = (ptab[i].start_s & 0x3f); + h = ptab[i].start_h + 1; + + if (max_h < h) + max_h = h; + if (max_s < s) + max_s = s; + + s = (ptab[i].end_s & 0x3f); + h = ptab[i].end_h + 1; + + if (max_h < h) { + max_h = h; + hd_geometry.hsrc = "MBR"; + } + if (max_s < s) { + max_s = s; + hd_geometry.ssrc = "MBR"; + } + } + } + } + } + } + + if (!max_h) + max_h = xsectors > 2097152 ? 255 : 64; + if (!max_s) + max_s = xsectors > 2097152 ? 63 : 32; + + hd_geometry.h = max_h; + hd_geometry.s = max_s; + } + + if (!hd_geometry.c) + hd_geometry.c = xsectors / (hd_geometry.h * hd_geometry.s); + + if ((p = getcmditem("floppy")) != CMD_NOTFOUND) { + hd_geometry.driveno = CMD_HASDATA(p) ? atou(p) & 0x7f : 0; + } else if ((p = getcmditem("harddisk")) != CMD_NOTFOUND) { + hd_geometry.driveno = CMD_HASDATA(p) ? atou(p) | 0x80 : 0x80; + } + + if (hd_geometry.driveno & 0x80) { + hd_geometry.type = 0; /* Type = hard disk */ + } else { + if (hd_geometry.type == 0) + hd_geometry.type = 0x10; /* ATAPI floppy, e.g. LS-120 */ + } + + if ((size - hd_geometry.offset) & 0x1ff) { + puts("MEMDISK: Image has fractional end sector\n"); + } + if (sectors % (hd_geometry.h * hd_geometry.s)) { + puts("MEMDISK: Image seems to have fractional end cylinder\n"); + } + if ((hd_geometry.c * hd_geometry.h * hd_geometry.s) > sectors) { + puts("MEMDISK: Image appears to be truncated\n"); + } + + return &hd_geometry; +} + +/* + * Find a $PnP installation check structure; return (ES << 16) + DI value + */ +static uint32_t pnp_install_check(void) +{ + uint32_t *seg; + unsigned char *p, csum; + int i, len; + + for (seg = (uint32_t *) 0xf0000; seg < (uint32_t *) 0x100000; seg += 4) { + if (*seg == ('$' + ('P' << 8) + ('n' << 16) + ('P' << 24))) { + p = (unsigned char *)seg; + len = p[5]; + if (len < 0x21) + continue; + csum = 0; + for (i = len; i; i--) + csum += *p++; + if (csum != 0) + continue; + + return (0xf000 << 16) + (uint16_t) (unsigned long)seg; + } + } + + return 0; +} + +/* + * Relocate the real-mode code to a new segment + */ +struct gdt_ptr { + uint16_t limit; + uint32_t base; +} __attribute__ ((packed)); + +static void set_seg_base(uint32_t gdt_base, int seg, uint32_t v) +{ + *(uint16_t *) (gdt_base + seg + 2) = v; + *(uint8_t *) (gdt_base + seg + 4) = v >> 16; + *(uint8_t *) (gdt_base + seg + 7) = v >> 24; +} + +static void relocate_rm_code(uint32_t newbase) +{ + uint32_t gdt_base; + uint32_t oldbase = rm_args.rm_base; + uint32_t delta = newbase - oldbase; + + cli(); + memmove((void *)newbase, (void *)oldbase, rm_args.rm_size); + + rm_args.rm_return += delta; + rm_args.rm_intcall += delta; + rm_args.rm_bounce += delta; + rm_args.rm_base += delta; + rm_args.rm_gdt += delta; + rm_args.rm_pmjmp += delta; + rm_args.rm_rmjmp += delta; + + gdt_base = rm_args.rm_gdt; + + *(uint32_t *) (gdt_base + 2) = gdt_base; /* GDT self-pointer */ + + /* Segments 0x10 and 0x18 are real-mode-based */ + set_seg_base(gdt_base, 0x10, rm_args.rm_base); + set_seg_base(gdt_base, 0x18, rm_args.rm_base); + + asm volatile ("lgdtl %0"::"m" (*(char *)gdt_base)); + + *(uint32_t *) rm_args.rm_pmjmp += delta; + *(uint16_t *) rm_args.rm_rmjmp += delta >> 4; + + rm_args.rm_handle_interrupt += delta; + + sti(); +} + +static uint8_t checksum_buf(const void *buf, int count) +{ + const uint8_t *p = buf; + uint8_t c = 0; + + while (count--) + c += *p++; + + return c; +} + +static int stack_needed(void) +{ + const unsigned int min_stack = 128; /* Minimum stack size */ + const unsigned int def_stack = 512; /* Default stack size */ + unsigned int v = 0; + const char *p; + + if (CMD_HASDATA(p = getcmditem("stack"))) + v = atou(p); + + if (!v) + v = def_stack; + + if (v < min_stack) + v = min_stack; + + return v; +} + +struct real_mode_args rm_args; + +/* + * Actual setup routine + * Returns the drive number (which is then passed in %dl to the + * called routine.) + */ +void setup(const struct real_mode_args *rm_args_ptr) +{ + unsigned int bin_size; + char *memdisk_hook; + struct memdisk_header *hptr; + struct patch_area *pptr; + struct mBFT *mbft; + uint16_t driverseg; + uint32_t driverptr, driveraddr; + uint16_t dosmem_k; + uint32_t stddosmem; + const struct geometry *geometry; + unsigned int total_size; + unsigned int cmdline_len, stack_len, e820_len; + const struct edd4_bvd *bvd; + const struct edd4_bootcat *boot_cat = 0; + com32sys_t regs; + uint32_t ramdisk_image, ramdisk_size; + uint32_t boot_base, rm_base; + int bios_drives; + int do_edd = 1; /* 0 = no, 1 = yes, default is yes */ + int do_eltorito = 0; /* default is no */ + int no_bpt; /* No valid BPT presented */ + uint32_t boot_seg = 0; /* Meaning 0000:7C00 */ + uint32_t boot_len = 512; /* One sector */ + + /* We need to copy the rm_args into their proper place */ + memcpy(&rm_args, rm_args_ptr, sizeof rm_args); + sti(); /* ... then interrupts are safe */ + + /* Show signs of life */ + printf("%s %s\n", memdisk_version, copyright); + + if (!shdr->ramdisk_image || !shdr->ramdisk_size) + die("MEMDISK: No ramdisk image specified!\n"); + + ramdisk_image = shdr->ramdisk_image; + ramdisk_size = shdr->ramdisk_size; + + e820map_init(); /* Initialize memory data structure */ + get_mem(); /* Query BIOS for memory map */ + parse_mem(); /* Parse memory map */ + + printf("Ramdisk at 0x%08x, length 0x%08x\n", ramdisk_image, ramdisk_size); + + unzip_if_needed(&ramdisk_image, &ramdisk_size); + + geometry = get_disk_image_geometry(ramdisk_image, ramdisk_size); + + if (getcmditem("edd") != CMD_NOTFOUND || + getcmditem("ebios") != CMD_NOTFOUND) + do_edd = 1; + else if (getcmditem("noedd") != CMD_NOTFOUND || + getcmditem("noebios") != CMD_NOTFOUND || + getcmditem("cbios") != CMD_NOTFOUND) + do_edd = 0; + else + do_edd = (geometry->driveno & 0x80) ? 1 : 0; + + if (getcmditem("iso") != CMD_NOTFOUND) { + do_eltorito = 1; + do_edd = 1; /* Mandatory */ + } + + /* Choose the appropriate installable memdisk hook */ + if (do_eltorito) { + if (geometry->sector_shift == 11) { + bin_size = (int)&_binary_memdisk_iso_2048_bin_size; + memdisk_hook = (char *)&_binary_memdisk_iso_2048_bin_start; + } else { + bin_size = (int)&_binary_memdisk_iso_512_bin_size; + memdisk_hook = (char *)&_binary_memdisk_iso_512_bin_start; + } + } else { + if (do_edd) { + bin_size = (int)&_binary_memdisk_edd_512_bin_size; + memdisk_hook = (char *)&_binary_memdisk_edd_512_bin_start; + } else { + bin_size = (int)&_binary_memdisk_chs_512_bin_size; + memdisk_hook = (char *)&_binary_memdisk_chs_512_bin_start; + } + } + + /* Reserve the ramdisk memory */ + insertrange(ramdisk_image, ramdisk_size, 2); + parse_mem(); /* Recompute variables */ + + /* Figure out where it needs to go */ + hptr = (struct memdisk_header *)memdisk_hook; + pptr = (struct patch_area *)(memdisk_hook + hptr->patch_offs); + + dosmem_k = rdz_16(BIOS_BASEMEM); + pptr->mdi.olddosmem = dosmem_k; + stddosmem = dosmem_k << 10; + /* If INT 15 E820 and INT 12 disagree, go with the most conservative */ + if (stddosmem > dos_mem) + stddosmem = dos_mem; + + pptr->driveno = geometry->driveno; + pptr->drivetype = geometry->type; + pptr->cylinders = geometry->c; /* Possible precision loss */ + pptr->heads = geometry->h; + pptr->sectors = geometry->s; + pptr->mdi.disksize = geometry->sectors; + pptr->mdi.diskbuf = ramdisk_image + geometry->offset; + pptr->mdi.sector_shift = geometry->sector_shift; + pptr->statusptr = (geometry->driveno & 0x80) ? 0x474 : 0x441; + + pptr->mdi.bootloaderid = shdr->type_of_loader; + + pptr->configflags = CONFIG_SAFEINT; /* Default */ + /* Set config flags */ + if (getcmditem("ro") != CMD_NOTFOUND) { + pptr->configflags |= CONFIG_READONLY; + } + if (getcmditem("raw") != CMD_NOTFOUND) { + pptr->configflags &= ~CONFIG_MODEMASK; + pptr->configflags |= CONFIG_RAW; + } + if (getcmditem("bigraw") != CMD_NOTFOUND) { + pptr->configflags &= ~CONFIG_MODEMASK; + pptr->configflags |= CONFIG_BIGRAW | CONFIG_RAW; + } + if (getcmditem("int") != CMD_NOTFOUND) { + pptr->configflags &= ~CONFIG_MODEMASK; + /* pptr->configflags |= 0; */ + } + if (getcmditem("safeint") != CMD_NOTFOUND) { + pptr->configflags &= ~CONFIG_MODEMASK; + pptr->configflags |= CONFIG_SAFEINT; + } + + printf("Disk is %s%d, %u%s K, C/H/S = %u/%u/%u (%s/%s), EDD %s, %s\n", + (geometry->driveno & 0x80) ? "hd" : "fd", + geometry->driveno & 0x7f, + geometry->sectors >> 1, + (geometry->sectors & 1) ? ".5" : "", + geometry->c, geometry->h, geometry->s, + geometry->hsrc, geometry->ssrc, + do_edd ? "on" : "off", + pptr->configflags & CONFIG_READONLY ? "ro" : "rw"); + + puts("Using "); + switch (pptr->configflags & CONFIG_MODEMASK) { + case 0: + puts("standard INT 15h"); + break; + case CONFIG_SAFEINT: + puts("safe INT 15h"); + break; + case CONFIG_RAW: + puts("raw"); + break; + case CONFIG_RAW | CONFIG_BIGRAW: + puts("big real mode raw"); + break; + default: + printf("unknown %#x", pptr->configflags & CONFIG_MODEMASK); + break; + } + puts(" access to high memory\n"); + + /* Set up a drive parameter table */ + if (geometry->driveno & 0x80) { + /* Hard disk */ + pptr->dpt.hd.max_cyl = geometry->c - 1; + pptr->dpt.hd.max_head = geometry->h - 1; + pptr->dpt.hd.ctrl = (geometry->h > 8) ? 0x08 : 0; + } else { + /* Floppy - most of these fields are bogus and mimic + a 1.44 MB floppy drive */ + pptr->dpt.fd.specify1 = 0xdf; + pptr->dpt.fd.specify2 = 0x02; + pptr->dpt.fd.delay = 0x25; + pptr->dpt.fd.sectors = geometry->s; + pptr->dpt.fd.bps = 0x02; + pptr->dpt.fd.isgap = 0x12; + pptr->dpt.fd.dlen = 0xff; + pptr->dpt.fd.fgap = 0x6c; + pptr->dpt.fd.ffill = 0xf6; + pptr->dpt.fd.settle = 0x0f; + pptr->dpt.fd.mstart = 0x05; + pptr->dpt.fd.maxtrack = geometry->c - 1; + pptr->dpt.fd.cmos = geometry->type > 5 ? 5 : geometry->type; + + pptr->dpt.fd.old_fd_dpt = rdz_32(BIOS_INT1E); + } + + /* Set up an EDD drive parameter table */ + if (do_edd) { + pptr->edd_dpt.sectors = geometry->sectors; + /* The EDD spec has this as <= 15482880 sectors (1024x240x63); + this seems to make very little sense. Try for something saner. */ + if (geometry->c <= 1024 && geometry->h <= 255 && geometry->s <= 63) { + pptr->edd_dpt.c = geometry->c; + pptr->edd_dpt.h = geometry->h; + pptr->edd_dpt.s = geometry->s; + /* EDD-4 states that invalid geometry should be returned + * for INT 0x13, AH=0x48 "EDD Get Disk Parameters" call on an + * El Torito ODD. Check for 2048-byte sector size + */ + if (geometry->sector_shift != 11) + pptr->edd_dpt.flags |= 0x0002; /* Geometry valid */ + } + if (!(geometry->driveno & 0x80)) { + /* Floppy drive. Mark it as a removable device with + media change notification; media is present. */ + pptr->edd_dpt.flags |= 0x0014; + } + + pptr->edd_dpt.devpath[0] = pptr->mdi.diskbuf; + pptr->edd_dpt.chksum = -checksum_buf(&pptr->edd_dpt.dpikey, 73 - 30); + } + + if (do_eltorito) { + bvd = (struct edd4_bvd *)(ramdisk_image + 17 * 2048); + boot_cat = + (struct edd4_bootcat *)(ramdisk_image + bvd->boot_cat * 2048); + pptr->cd_pkt.type = boot_cat->initial_entry.media_type; /* Cheat */ + pptr->cd_pkt.driveno = geometry->driveno; + pptr->cd_pkt.start = boot_cat->initial_entry.load_block; + boot_seg = pptr->cd_pkt.load_seg = boot_cat->initial_entry.load_seg; + pptr->cd_pkt.sect_count = boot_cat->initial_entry.sect_count; + boot_len = pptr->cd_pkt.sect_count * 512; + pptr->cd_pkt.geom1 = (uint8_t)(pptr->cylinders) & 0xFF; + pptr->cd_pkt.geom2 = + (uint8_t)(pptr->sectors) | (uint8_t)((pptr->cylinders >> 2) & 0xC0); + pptr->cd_pkt.geom3 = (uint8_t)(pptr->heads); + } + + /* The size is given by hptr->total_size plus the size of the E820 + map -- 12 bytes per range; we may need as many as 2 additional + ranges (each insertrange() can worst-case turn 1 area into 3) + plus the terminating range, over what nranges currently show. */ + total_size = hptr->total_size; /* Actual memdisk code */ + e820_len = (nranges + 3) * sizeof(ranges[0]); + total_size += e820_len; /* E820 memory ranges */ + cmdline_len = strlen(shdr->cmdline) + 1; + total_size += cmdline_len; /* Command line */ + stack_len = stack_needed(); + total_size += stack_len; /* Stack */ + printf("Code %u, meminfo %u, cmdline %u, stack %u\n", + hptr->total_size, e820_len, cmdline_len, stack_len); + printf("Total size needed = %u bytes, allocating %uK\n", + total_size, (total_size + 0x3ff) >> 10); + + if (total_size > dos_mem) + die("MEMDISK: Insufficient low memory\n"); + + driveraddr = stddosmem - total_size; + driveraddr &= ~0x3FF; + + printf("Old dos memory at 0x%05x (map says 0x%05x), loading at 0x%05x\n", + stddosmem, dos_mem, driveraddr); + + /* Reserve this range of memory */ + wrz_16(BIOS_BASEMEM, driveraddr >> 10); + insertrange(driveraddr, dos_mem - driveraddr, 2); + parse_mem(); + + pptr->mem1mb = low_mem >> 10; + pptr->mem16mb = high_mem >> 16; + if (low_mem == (15 << 20)) { + /* lowmem maxed out */ + uint32_t int1588mem = (high_mem >> 10) + (low_mem >> 10); + pptr->memint1588 = (int1588mem > 0xffff) ? 0xffff : int1588mem; + } else { + pptr->memint1588 = low_mem >> 10; + } + + printf("1588: 0x%04x 15E801: 0x%04x 0x%04x\n", + pptr->memint1588, pptr->mem1mb, pptr->mem16mb); + + driverseg = driveraddr >> 4; + driverptr = driverseg << 16; + + /* Anything beyond the end is for the stack */ + pptr->mystack = (uint16_t) (stddosmem - driveraddr); + + pptr->mdi.oldint13.uint32 = rdz_32(BIOS_INT13); + pptr->mdi.oldint15.uint32 = rdz_32(BIOS_INT15); + + /* Adjust the E820 table: if there are null ranges (type 0) + at the end, change them to type end of list (-1). + This is necessary for the driver to be able to report end + of list correctly. */ + while (nranges && ranges[nranges - 1].type == 0) { + ranges[--nranges].type = -1; + } + + if (getcmditem("nopassany") != CMD_NOTFOUND) { + printf("nopassany specified - we're the only drive of any kind\n"); + bios_drives = 0; + pptr->drivecnt = 0; + no_bpt = 1; + pptr->mdi.oldint13.uint32 = driverptr + hptr->iret_offs; + wrz_8(BIOS_EQUIP, rdz_8(BIOS_EQUIP) & ~0xc1); + wrz_8(BIOS_HD_COUNT, 0); + } else if (getcmditem("nopass") != CMD_NOTFOUND) { + printf("nopass specified - we're the only drive\n"); + bios_drives = 0; + pptr->drivecnt = 0; + no_bpt = 1; + } else { + /* Query drive parameters of this type */ + memset(®s, 0, sizeof regs); + regs.es = 0; + regs.eax.b[1] = 0x08; + regs.edx.b[0] = geometry->driveno & 0x80; + intcall(0x13, ®s, ®s); + + /* Note: per suggestion from the Interrupt List, consider + INT 13 08 to have failed if the sector count in CL is zero. */ + if ((regs.eflags.l & 1) || !(regs.ecx.b[0] & 0x3f)) { + printf("INT 13 08: Failure, assuming this is the only drive\n"); + pptr->drivecnt = 0; + no_bpt = 1; + } else { + printf("INT 13 08: Success, count = %u, BPT = %04x:%04x\n", + regs.edx.b[0], regs.es, regs.edi.w[0]); + pptr->drivecnt = regs.edx.b[0]; + no_bpt = !(regs.es | regs.edi.w[0]); + } + + /* Compare what INT 13h returned with the appropriate equipment byte */ + if (geometry->driveno & 0x80) { + bios_drives = rdz_8(BIOS_HD_COUNT); + } else { + uint8_t equip = rdz_8(BIOS_EQUIP); + + if (equip & 1) + bios_drives = (equip >> 6) + 1; + else + bios_drives = 0; + } + + if (pptr->drivecnt > bios_drives) { + printf("BIOS equipment byte says count = %d, go with that\n", + bios_drives); + pptr->drivecnt = bios_drives; + } + } + + /* Add ourselves to the drive count */ + pptr->drivecnt++; + + /* Discontiguous drive space. There is no really good solution for this. */ + if (pptr->drivecnt <= (geometry->driveno & 0x7f)) + pptr->drivecnt = (geometry->driveno & 0x7f) + 1; + + /* Probe for contiguous range of BIOS drives starting with driveno */ + pptr->driveshiftlimit = probe_drive_range(geometry->driveno) + 1; + if ((pptr->driveshiftlimit & 0x80) != (geometry->driveno & 0x80)) + printf("We lost the last drive in our class of drives.\n"); + printf("Drive probing gives drive shift limit: 0x%02x\n", + pptr->driveshiftlimit); + + /* Pointer to the command line */ + pptr->mdi.cmdline.seg_off.offset = bin_size + (nranges + 1) * sizeof(ranges[0]); + pptr->mdi.cmdline.seg_off.segment = driverseg; + + /* Copy driver followed by E820 table followed by command line */ + { + unsigned char *dpp = (unsigned char *)(driverseg << 4); + + /* Adjust these pointers to point to the installed image */ + /* Careful about the order here... the image isn't copied yet! */ + pptr = (struct patch_area *)(dpp + hptr->patch_offs); + hptr = (struct memdisk_header *)dpp; + + /* Actually copy to low memory */ + dpp = mempcpy(dpp, memdisk_hook, bin_size); + dpp = mempcpy(dpp, ranges, (nranges + 1) * sizeof(ranges[0])); + dpp = mempcpy(dpp, shdr->cmdline, cmdline_len); + } + + /* Note the previous INT 13h hook in the "safe hook" structure */ + hptr->safe_hook.old_hook.uint32 = pptr->mdi.oldint13.uint32; + + /* Re-fill the "safe hook" mBFT field with the physical address */ + mbft = (struct mBFT *)(((const char *)hptr) + hptr->safe_hook.mbft); + hptr->safe_hook.mbft = (size_t)mbft; + + /* Update various BIOS magic data areas (gotta love this shit) */ + + if (geometry->driveno & 0x80) { + /* Update BIOS hard disk count */ + uint8_t nhd = pptr->drivecnt; + + if (nhd > 128) + nhd = 128; + + if (!do_eltorito) + wrz_8(BIOS_HD_COUNT, nhd); + } else { + /* Update BIOS floppy disk count */ + uint8_t equip = rdz_8(BIOS_EQUIP); + uint8_t nflop = pptr->drivecnt; + + if (nflop > 4) /* Limit of equipment byte */ + nflop = 4; + + equip &= 0x3E; + if (nflop) + equip |= ((nflop - 1) << 6) | 0x01; + + wrz_8(BIOS_EQUIP, equip); + + /* Install DPT pointer if this was the only floppy */ + if (getcmditem("dpt") != CMD_NOTFOUND || + ((nflop == 1 || no_bpt) && getcmditem("nodpt") == CMD_NOTFOUND)) { + /* Do install a replacement DPT into INT 1Eh */ + pptr->mdi.dpt_ptr = + hptr->patch_offs + offsetof(struct patch_area, dpt); + } + } + + /* Complete the mBFT */ + mbft->acpi.signature[0] = 'm'; /* "mBFT" */ + mbft->acpi.signature[1] = 'B'; + mbft->acpi.signature[2] = 'F'; + mbft->acpi.signature[3] = 'T'; + mbft->safe_hook = (size_t)&hptr->safe_hook; + mbft->acpi.checksum = -checksum_buf(mbft, mbft->acpi.length); + + /* Install the interrupt handlers */ + printf("old: int13 = %08x int15 = %08x int1e = %08x\n", + rdz_32(BIOS_INT13), rdz_32(BIOS_INT15), rdz_32(BIOS_INT1E)); + + wrz_32(BIOS_INT13, driverptr + hptr->int13_offs); + wrz_32(BIOS_INT15, driverptr + hptr->int15_offs); + if (pptr->mdi.dpt_ptr) + wrz_32(BIOS_INT1E, driverptr + pptr->mdi.dpt_ptr); + + printf("new: int13 = %08x int15 = %08x int1e = %08x\n", + rdz_32(BIOS_INT13), rdz_32(BIOS_INT15), rdz_32(BIOS_INT1E)); + + /* Figure out entry point */ + if (!boot_seg) { + boot_base = 0x7c00; + shdr->sssp = 0x7c00; + shdr->csip = 0x7c00; + } else { + boot_base = boot_seg << 4; + shdr->sssp = boot_seg << 16; + shdr->csip = boot_seg << 16; + } + + /* Relocate the real-mode code to below the stub */ + rm_base = (driveraddr - rm_args.rm_size) & ~15; + if (rm_base < boot_base + boot_len) + die("MEMDISK: bootstrap too large to load\n"); + + relocate_rm_code(rm_base); + + /* Reboot into the new "disk" */ + puts("Loading boot sector... "); + + memcpy((void *)boot_base, + (char *)pptr->mdi.diskbuf + geometry->boot_lba * 512, + boot_len); + + if (getcmditem("pause") != CMD_NOTFOUND) { + puts("press any key to boot... "); + regs.eax.w[0] = 0; + intcall(0x16, ®s, NULL); + } + + puts("booting...\n"); + + /* On return the assembly code will jump to the boot vector */ + shdr->esdi = pnp_install_check(); + shdr->edx = geometry->driveno; +} + |