diff options
Diffstat (limited to 'src/VBox/Devices/PC/BIOS/boot.c')
| -rw-r--r-- | src/VBox/Devices/PC/BIOS/boot.c | 56 |
1 files changed, 28 insertions, 28 deletions
diff --git a/src/VBox/Devices/PC/BIOS/boot.c b/src/VBox/Devices/PC/BIOS/boot.c index 57212fa6..37daeac2 100644 --- a/src/VBox/Devices/PC/BIOS/boot.c +++ b/src/VBox/Devices/PC/BIOS/boot.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2006-2011 Oracle Corporation + * Copyright (C) 2006-2012 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; @@ -91,17 +91,17 @@ static const char drivetypes[][10]={"Floppy","Hard Disk","CD-ROM","LAN"}; void print_boot_device(uint8_t cdboot, uint8_t lanboot, uint8_t drive) { int i; - + // cdboot contains 0 if lan/floppy/harddisk, 1 otherwise // lanboot contains 0 if floppy/harddisk, 1 otherwise // drive contains real/emulated boot drive - + if(cdboot)i=2; // CD-Rom else if(lanboot)i=3; // LAN else if((drive&0x0080)==0x00)i=0; // Floppy else if((drive&0x0080)==0x80)i=1; // Hard drive else return; - + BX_INFO("Booting from %s...\n",drivetypes[i]); } @@ -110,17 +110,17 @@ void print_boot_device(uint8_t cdboot, uint8_t lanboot, uint8_t drive) // displays the reason why boot failed //-------------------------------------------------------------------------- //@todo: pass inputs as bit flags rather than bytes? -void print_boot_failure(uint8_t cdboot, uint8_t lanboot, uint8_t drive, +void print_boot_failure(uint8_t cdboot, uint8_t lanboot, uint8_t drive, uint8_t reason, uint8_t lastdrive) { uint16_t drivenum = drive&0x7f; - + // cdboot: 1 if boot from cd, 0 otherwise // lanboot: 1 if boot from lan, 0 otherwise // drive : drive number // reason: 0 signature check failed, 1 read error // lastdrive: 1 boot drive is the last one in boot sequence - + if (cdboot) BX_INFO("Boot from %s failed\n",drivetypes[2]); else if (lanboot) @@ -129,7 +129,7 @@ void print_boot_failure(uint8_t cdboot, uint8_t lanboot, uint8_t drive, BX_INFO("Boot from %s %d failed\n", drivetypes[1],drivenum); else BX_INFO("Boot from %s %d failed\n", drivetypes[0],drivenum); - + if (lastdrive==1) { if (reason==0) BX_PANIC("No bootable medium found! System halted.\n"); @@ -161,7 +161,7 @@ uint32_t BIOSCALL int19_function(uint8_t bseqnr) uint16_t bootseg; uint16_t status; uint8_t lastdrive=0; - + // if BX_ELTORITO_BOOT is not defined, old behavior // check bit 5 in CMOS reg 0x2d. load either 0x00 or 0x80 into DL // in preparation for the initial INT 13h (0=floppy A:, 0x80=C:) @@ -180,7 +180,7 @@ uint32_t BIOSCALL int19_function(uint8_t bseqnr) // 0x03 : first cdrom // 0x04 : local area network // else : boot failure - + // Get the boot sequence #if BX_ELTORITO_BOOT bootseq=inb_cmos(0x3d); @@ -191,15 +191,15 @@ uint32_t BIOSCALL int19_function(uint8_t bseqnr) /* Boot delay hack. */ if (bseqnr == 1) delay_boot((inb_cmos(0x3c) & 0xf0) >> 4); /* Implemented in logo.c */ - + if (bseqnr==2) bootseq >>= 4; if (bseqnr==3) bootseq >>= 8; if (bseqnr==4) bootseq >>= 12; if (bootseq<0x10) lastdrive = 1; bootdrv=0x00; bootcd=0; bootlan=0; - BX_INFO("Boot : bseqnr=%d, bootseq=%x\r\n",bseqnr, bootseq); - + BX_INFO("Boot : bseqnr=%d, bootseq=%x\r\n",bseqnr, bootseq); + switch(bootseq & 0x0f) { case 0x01: bootdrv=0x00; @@ -209,7 +209,7 @@ uint32_t BIOSCALL int19_function(uint8_t bseqnr) { // Get the Boot drive. uint8_t boot_drive = read_byte(ebda_seg, (uint16_t)&EbdaData->uForceBootDrive); - + bootdrv = boot_drive + 0x80; bootcd=0; break; @@ -223,7 +223,7 @@ uint32_t BIOSCALL int19_function(uint8_t bseqnr) } #else bootseq=inb_cmos(0x2d); - + if (bseqnr==2) { bootseq ^= 0x20; lastdrive = 1; @@ -231,25 +231,25 @@ uint32_t BIOSCALL int19_function(uint8_t bseqnr) bootdrv=0x00; bootcd=0; if((bootseq&0x20)==0) bootdrv=0x80; #endif // BX_ELTORITO_BOOT - + #if BX_ELTORITO_BOOT // We have to boot from cd if (bootcd != 0) { status = cdrom_boot(); - + // If failure if ( (status & 0x00ff) !=0 ) { print_cdromboot_failure(status); print_boot_failure(bootcd, bootlan, bootdrv, 1, lastdrive); return 0x00000000; } - + bootseg = read_word(ebda_seg,(uint16_t)&EbdaData->cdemu.load_segment); bootdrv = (uint8_t)(status>>8); } - + #endif // BX_ELTORITO_BOOT - + // Check for boot from LAN first if (bootlan == 1) { uint8_t __far *fplan; @@ -270,7 +270,7 @@ uint32_t BIOSCALL int19_function(uint8_t bseqnr) print_boot_device(bootcd, bootlan, bootdrv); netboot_entry = (void __far *)(fplan + 6); netboot_entry(); - } + } else { //Found Normal Pnp ROM @@ -281,7 +281,7 @@ uint32_t BIOSCALL int19_function(uint8_t bseqnr) } } } - + // boot from LAN will not return if successful. print_boot_failure(bootcd, bootlan, bootdrv, 1, lastdrive); return 0x00000000; @@ -290,14 +290,14 @@ uint32_t BIOSCALL int19_function(uint8_t bseqnr) // We have to boot from harddisk or floppy if (bootcd == 0 && bootlan == 0) { bootseg=0x07c0; - + status = read_boot_sec(bootdrv,bootseg); if (status != 0) { print_boot_failure(bootcd, bootlan, bootdrv, 1, lastdrive); return 0x00000000; } } - + // There is *no* requirement whatsoever for a valid floppy boot sector // to have a 55AAh signature. UNIX boot floppies typically have no such // signature. In general, it is impossible to tell a valid bootsector @@ -309,27 +309,27 @@ uint32_t BIOSCALL int19_function(uint8_t bseqnr) // extremely unlikely to be valid. if (bootdrv != 0) bootchk = 0; else bootchk = 1; /* disable 0x55AA signature check on drive A: */ - + #if BX_ELTORITO_BOOT // if boot from cd, no signature check if (bootcd != 0) bootchk = 1; #endif // BX_ELTORITO_BOOT - + if (read_word(bootseg,0) == read_word(bootseg,2) || (bootchk == 0 && read_word(bootseg,0x1fe) != 0xaa55)) { print_boot_failure(bootcd, bootlan, bootdrv, 0, lastdrive); return 0x00000000; } - + #if BX_ELTORITO_BOOT // Print out the boot string print_boot_device(bootcd, bootlan, bootdrv); #else // BX_ELTORITO_BOOT print_boot_device(0, bootlan, bootdrv); #endif // BX_ELTORITO_BOOT - + // return the boot segment return (((uint32_t)bootdrv) << 16) + bootseg; } |