| 1 | /* ----------------------------------------------------------------------- |
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| 2 | * |
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| 3 | * Copyright 1999-2008 H. Peter Anvin - All Rights Reserved |
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| 4 | * |
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| 5 | * This program is free software; you can redistribute it and/or modify |
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| 6 | * it under the terms of the GNU General Public License as published by |
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| 7 | * the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, |
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| 8 | * Boston MA 02110-1301, USA; either version 2 of the License, or |
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| 9 | * (at your option) any later version; incorporated herein by reference. |
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| 10 | * |
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| 11 | * ----------------------------------------------------------------------- |
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| 12 | */ |
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| 13 | #include <sys/cpu.h> |
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| 14 | #include <sys/io.h> |
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| 15 | #include <string.h> |
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| 16 | #include <core.h> |
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| 17 | #include <fs.h> |
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| 18 | #include <bios.h> |
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| 19 | #include <syslinux/video.h> |
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| 20 | |
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| 21 | /* |
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| 22 | * localboot.c |
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| 23 | * |
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| 24 | * Boot from a local disk, or invoke INT 18h. |
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| 25 | */ |
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| 26 | |
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| 27 | #define LOCALBOOT_MSG "Booting from local disk..." |
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| 28 | |
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| 29 | #define retry_count 16 |
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| 30 | |
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| 31 | extern void local_boot16(void); |
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| 32 | |
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| 33 | /* |
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| 34 | * Boot a specified local disk. AX specifies the BIOS disk number; or |
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| 35 | * -1 in case we should execute INT 18h ("next device.") |
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| 36 | */ |
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| 37 | __export void local_boot(int16_t ax) |
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| 38 | { |
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| 39 | com32sys_t ireg, oreg; |
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| 40 | int i; |
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| 41 | |
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| 42 | memset(&ireg, 0, sizeof(ireg)); |
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| 43 | syslinux_force_text_mode(); |
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| 44 | |
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| 45 | writestr(LOCALBOOT_MSG); |
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| 46 | crlf(); |
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| 47 | cleanup_hardware(); |
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| 48 | |
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| 49 | if (ax == -1) { |
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| 50 | /* Hope this does the right thing */ |
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| 51 | __intcall(0x18, &zero_regs, NULL); |
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| 52 | |
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| 53 | /* If we returned, oh boy... */ |
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| 54 | kaboom(); |
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| 55 | } |
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| 56 | |
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| 57 | /* |
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| 58 | * Load boot sector from the specified BIOS device and jump to |
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| 59 | * it. |
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| 60 | */ |
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| 61 | memset(&ireg, 0, sizeof ireg); |
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| 62 | ireg.edx.b[0] = ax & 0xff; |
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| 63 | ireg.eax.w[0] = 0; /* Reset drive */ |
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| 64 | __intcall(0x13, &ireg, NULL); |
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| 65 | |
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| 66 | memset(&ireg, 0, sizeof(ireg)); |
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| 67 | ireg.eax.w[0] = 0x0201; /* Read one sector */ |
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| 68 | ireg.ecx.w[0] = 0x0001; /* C/H/S = 0/0/1 (first sector) */ |
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| 69 | ireg.ebx.w[0] = OFFS(trackbuf); |
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| 70 | ireg.es = SEG(trackbuf); |
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| 71 | |
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| 72 | for (i = 0; i < retry_count; i++) { |
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| 73 | __intcall(0x13, &ireg, &oreg); |
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| 74 | |
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| 75 | if (!(oreg.eflags.l & EFLAGS_CF)) |
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| 76 | break; |
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| 77 | } |
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| 78 | |
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| 79 | if (i == retry_count) |
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| 80 | kaboom(); |
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| 81 | |
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| 82 | cli(); /* Abandon hope, ye who enter here */ |
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| 83 | memcpy((void *)0x07C00, trackbuf, 512); |
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| 84 | |
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| 85 | ireg.esi.w[0] = OFFS(trackbuf); |
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| 86 | ireg.edi.w[0] = 0x07C00; |
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| 87 | ireg.edx.w[0] = ax; |
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| 88 | call16(local_boot16, &ireg, NULL); |
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| 89 | } |
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| 90 | |
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| 91 | void pm_local_boot(com32sys_t *regs) |
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| 92 | { |
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| 93 | local_boot(regs->eax.w[0]); |
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| 94 | } |
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