diff options
Diffstat (limited to 'contrib/syslinux/syslinux-4.03/com32/gpllib/disk/geom.c')
| -rw-r--r-- | contrib/syslinux/syslinux-4.03/com32/gpllib/disk/geom.c | 271 |
1 files changed, 0 insertions, 271 deletions
diff --git a/contrib/syslinux/syslinux-4.03/com32/gpllib/disk/geom.c b/contrib/syslinux/syslinux-4.03/com32/gpllib/disk/geom.c deleted file mode 100644 index 9e673ed..0000000 --- a/contrib/syslinux/syslinux-4.03/com32/gpllib/disk/geom.c +++ /dev/null @@ -1,271 +0,0 @@ -/* ----------------------------------------------------------------------- * - * - * Copyright 2009 Pierre-Alexandre Meyer - * - * Some parts borrowed from chain.c32: - * - * Copyright 2003-2009 H. Peter Anvin - All Rights Reserved - * Copyright 2009 Intel Corporation; author: H. Peter Anvin - * - * This file is part of Syslinux, and is made available under - * the terms of the GNU General Public License version 2. - * - * ----------------------------------------------------------------------- */ - -#include <com32.h> -#include <string.h> -#include <stdio.h> -#include <disk/geom.h> - -#include <stdio.h> - -/** - * lba_to_chs - split given lba into cylinders/heads/sectors - **/ -void lba_to_chs(const struct driveinfo *drive_info, const int lba, - unsigned int *cylinder, unsigned int *head, - unsigned int *sector) -{ - unsigned int track; - - /* Use EDD, if valid */ - if (drive_info->edd_params.sectors_per_track > 0 && - drive_info->edd_params.heads > 0) { - *cylinder = (lba % drive_info->edd_params.sectors_per_track) + 1; - track = lba / drive_info->edd_params.sectors_per_track; - *head = track % drive_info->edd_params.heads; - *sector = track / drive_info->edd_params.heads; - } else if (drive_info->cbios) { - *cylinder = (lba % drive_info->legacy_sectors_per_track) + 1; - track = lba / drive_info->legacy_sectors_per_track; - *head = track % (drive_info->legacy_max_head + 1); - *sector = track / (drive_info->legacy_max_head + 1); - } -} - -/** - * detect_extensions - detect if we can use extensions - * - * INT 13 - IBM/MS INT 13 Extensions - INSTALLATION CHECK - * AH = 41h - * BX = 55AAh - * DL = drive (80h-FFh) - * - * Return: CF set on error (extensions not supported) - * AH = 01h (invalid function) - * CF clear if successful - * BX = AA55h if installed - * AH = major version of extensions - * 01h = 1.x - * 20h = 2.0 / EDD-1.0 - * 21h = 2.1 / EDD-1.1 - * 30h = EDD-3.0 - * AL = internal use - * CX = API subset support bitmap (see #00271) - * DH = extension version (v2.0+ ??? -- not present in 1.x) - * - * Note: the Phoenix Enhanced Disk Drive Specification v1.0 uses version 2.0 of - * the INT 13 Extensions API - * - * Bitfields for IBM/MS INT 13 Extensions API support bitmap: - * Bit(s) Description (Table 00271) - * 0 extended disk access functions (AH=42h-44h,47h,48h) supported - * 1 removable drive controller functions (AH=45h,46h,48h,49h,INT 15/AH=52h) - * supported - * 2 enhanced disk drive (EDD) functions (AH=48h,AH=4Eh) supported - * extended drive parameter table is valid (see #00273,#00278) - * 3-15 reserved (0) - **/ -static int detect_extensions(struct driveinfo *drive_info) -{ - com32sys_t getebios, ebios; - - memset(&getebios, 0, sizeof getebios); - memset(&ebios, 0, sizeof ebios); - - getebios.eflags.b[0] = 0x3; /* CF set */ - getebios.ebx.w[0] = 0x55aa; - getebios.edx.b[0] = drive_info->disk; - getebios.eax.b[1] = 0x41; - - __intcall(0x13, &getebios, &ebios); - - if (!(ebios.eflags.l & EFLAGS_CF) && ebios.ebx.w[0] == 0xaa55) { - drive_info->ebios = 1; - drive_info->edd_version = ebios.eax.b[1]; - drive_info->edd_functionality_subset = ebios.ecx.w[0]; - return 0; - } else - return -1; /* Drive does not exist? */ -} - -/** - * get_drive_parameters_with_extensions - retrieve disk parameters via AH=48h - * - * INT 13 - IBM/MS INT 13 Extensions - GET DRIVE PARAMETERS - * AH = 48h - * DL = drive (80h-FFh) - * DS:SI -> buffer for drive parameters - * Return: CF clear if successful - * AH = 00h - * DS:SI buffer filled - * CF set on error - * AH = error code (see #00234) - * BUG: several different Compaq BIOSes incorrectly report high-numbered - * drives (such as 90h, B0h, D0h, and F0h) as present, giving them the - * same geometry as drive 80h; as a workaround, scan through disk - * numbers, stopping as soon as the number of valid drives encountered - * equals the value in 0040h:0075h - **/ -static int get_drive_parameters_with_extensions(struct driveinfo *drive_info) -{ - com32sys_t inreg, outreg; - struct edd_device_parameters *dp = __com32.cs_bounce; - - memset(&inreg, 0, sizeof inreg); - - /* - * The caller shall set this value to the maximum Result Buffer - * length, in bytes. If the length of this buffer is less than 30 - * bytes, this function shall not return the pointer to Drive Parameter - * Table (DPT) extension. If the buffer length is 30 or greater on - * entry, it shall be set to 30 on exit. If the buffer length is - * between 26 and 29, it shall be set to 26 on exit. - * If the buffer length is less than 26 on entry an error shall be - * returned. - */ - dp->len = sizeof(struct edd_device_parameters); - - inreg.esi.w[0] = OFFS(dp); - inreg.ds = SEG(dp); - inreg.edx.b[0] = drive_info->disk; - inreg.eax.b[1] = 0x48; - - __intcall(0x13, &inreg, &outreg); - - /* CF set on error */ - if (outreg.eflags.l & EFLAGS_CF) - return outreg.eax.b[1]; - - memcpy(&drive_info->edd_params, dp, sizeof drive_info->edd_params); - - return 0; -} - -/** - * get_drive_parameters_without_extensions - retrieve drive parameters via AH=08h - * - * INT 13 - DISK - GET DRIVE PARAMETERS (PC,XT286,CONV,PS,ESDI,SCSI) - * AH = 08h - * DL = drive (bit 7 set for hard disk) - * - * Return: CF set on error - * AH = status (07h) (see #00234) - * CF clear if successful - * AH = 00h - * AL = 00h on at least some BIOSes - * BL = drive type (AT/PS2 floppies only) (see #00242) - * CH = low eight bits of maximum cylinder number - * CL = maximum sector number (bits 5-0) - * high two bits of maximum cylinder number (bits 7-6) - * DH = maximum head number - * DL = number of drives - * ES:DI -> drive parameter table (floppies only) - * - * Notes: - * - may return successful even though specified drive is greater than the - * number of attached drives of that type (floppy/hard); check DL to - * ensure validity - * - for systems predating the IBM AT, this call is only valid for hard - * disks, as it is implemented by the hard disk BIOS rather than the - * ROM BIOS - * - Toshiba laptops with HardRAM return DL=02h when called with DL=80h, - * but fail on DL=81h. The BIOS data at 40h:75h correctly reports 01h. - * may indicate only two drives present even if more are attached; to - * ensure a correct count, one can use AH=15h to scan through possible - * drives - * - for BIOSes which reserve the last cylinder for testing purposes, the - * cylinder count is automatically decremented - * on PS/1s with IBM ROM DOS 4, nonexistent drives return CF clear, - * BX=CX=0000h, and ES:DI = 0000h:0000h - * - the PC-Tools PCFORMAT program requires that AL=00h before it will - * proceed with the formatting - * - * BUG: several different Compaq BIOSes incorrectly report high-numbered - * drives (such as 90h, B0h, D0h, and F0h) as present, giving them the - * same geometry as drive 80h; as a workaround, scan through disk - * numbers, stopping as soon as the number of valid drives encountered - * equals the value in 0040h:0075h - * - * SeeAlso: AH=06h"Adaptec",AH=13h"SyQuest",AH=48h,AH=15h,INT 1E - * SeeAlso: INT 41"HARD DISK 0" - **/ -static int get_drive_parameters_without_extensions(struct driveinfo *drive_info) -{ - com32sys_t getparm, parm; - - memset(&getparm, 0, sizeof getparm); - memset(&parm, 0, sizeof parm); - - /* Ralf Brown recommends setting ES:DI to 0:0 */ - getparm.esi.w[0] = 0; - getparm.ds = 0; - getparm.edx.b[0] = drive_info->disk; - getparm.eax.b[1] = 0x08; - - __intcall(0x13, &getparm, &parm); - - /* CF set on error */ - if (parm.eflags.l & EFLAGS_CF) - return parm.eax.b[1]; - - /* DL contains the maximum drive number (it starts at 0) */ - drive_info->legacy_max_drive = parm.edx.b[0]; - - // XXX broken - /* Drive specified greater than the bumber of attached drives */ - //if (drive_info->disk > drive_info->drives) - // return -1; - - drive_info->legacy_type = parm.ebx.b[0]; - - /* DH contains the maximum head number (it starts at 0) */ - drive_info->legacy_max_head = parm.edx.b[1]; - - /* Maximum sector number (bits 5-0) per track */ - drive_info->legacy_sectors_per_track = parm.ecx.b[0] & 0x3f; - - /* - * Maximum cylinder number: - * CH = low eight bits of maximum cylinder number - * CL = high two bits of maximum cylinder number (bits 7-6) - */ - drive_info->legacy_max_cylinder = parm.ecx.b[1] + - ((parm.ecx.b[0] & 0xc0) << 2); - - if (drive_info->legacy_sectors_per_track > 0) - drive_info->cbios = 1; /* Valid geometry */ - - return 0; -} - -/** - * get_drive_parameters - retrieve drive parameters - * @drive_info: driveinfo structure to fill - **/ -int get_drive_parameters(struct driveinfo *drive_info) -{ - int return_code; - - if (detect_extensions(drive_info)) - return -1; - - return_code = get_drive_parameters_without_extensions(drive_info); - - /* If geometry isn't valid, no need to try to get more info about the drive */ - /* Looks like in can confuse some optical drives */ - if (drive_info->ebios && drive_info->cbios) - get_drive_parameters_with_extensions(drive_info); - - return return_code; -} |