/* $Id: disk.c 89168 2021-05-19 13:35:28Z vboxsync $ */ /** @file * PC BIOS - ??? */ /* * Copyright (C) 2006-2020 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * -------------------------------------------------------------------- * * This code is based on: * * ROM BIOS for use with Bochs/Plex86/QEMU emulation environment * * Copyright (C) 2002 MandrakeSoft S.A. * * MandrakeSoft S.A. * 43, rue d'Aboukir * 75002 Paris - France * http://www.linux-mandrake.com/ * http://www.mandrakesoft.com/ * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * */ /* * Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice * other than GPL or LGPL is available it will apply instead, Oracle elects to use only * the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where * a choice of LGPL license versions is made available with the language indicating * that LGPLv2 or any later version may be used, or where a choice of which version * of the LGPL is applied is otherwise unspecified. */ #include #include "biosint.h" #include "inlines.h" #include "ebda.h" #include "ata.h" #if DEBUG_INT13_HD # define BX_DEBUG_INT13_HD(...) BX_DEBUG(__VA_ARGS__) #else # define BX_DEBUG_INT13_HD(...) #endif /* Generic disk read/write routine signature. */ typedef int __fastcall (* dsk_rw_func)(bio_dsk_t __far *bios_dsk); /* Controller specific disk access routines. Declared as a union to reduce * the need for conditionals when choosing between read/write functions. * Note that we get away with using near pointers, which is nice. */ typedef union { struct { dsk_rw_func read; dsk_rw_func write; } s; dsk_rw_func a[2]; } dsk_acc_t; /* Pointers to HW specific disk access routines. */ dsk_acc_t dskacc[DSKTYP_CNT] = { [DSK_TYPE_ATA] = { ata_read_sectors, ata_write_sectors }, #ifdef VBOX_WITH_AHCI [DSK_TYPE_AHCI] = { ahci_read_sectors, ahci_write_sectors }, #endif #ifdef VBOX_WITH_SCSI [DSK_TYPE_SCSI] = { scsi_read_sectors, scsi_write_sectors }, #endif }; /// @todo put in a header #define AX r.gr.u.r16.ax #define BX r.gr.u.r16.bx #define CX r.gr.u.r16.cx #define DX r.gr.u.r16.dx #define SI r.gr.u.r16.si #define DI r.gr.u.r16.di #define BP r.gr.u.r16.bp #define ELDX r.gr.u.r16.sp #define DS r.ds #define ES r.es #define FLAGS r.ra.flags.u.r16.flags /* * Build translated CHS geometry given a disk size in sectors. Based on * Phoenix EDD 3.0. This is used as a fallback to generate sane logical * geometry in case none was provided in CMOS. */ void set_geom_lba(chs_t __far *lgeo, uint64_t nsectors64) { uint32_t limit = 8257536; /* 1024 * 128 * 63 */ uint32_t nsectors; unsigned heads = 255; int i; nsectors = (nsectors64 >> 32) ? 0xFFFFFFFFL : (uint32_t)nsectors64; /* Start with ~4GB limit, go down to 504MB. */ for (i = 0; i < 4; ++i) { if (nsectors <= limit) heads = (heads + 1) / 2; limit /= 2; } lgeo->cylinders = nsectors / (heads * 63UL); if (lgeo->cylinders > 1024) lgeo->cylinders = 1024; lgeo->heads = heads; lgeo->spt = 63; /* Always 63 sectors per track, the maximum. */ } int edd_fill_dpt(dpt_t __far *dpt, bio_dsk_t __far *bios_dsk, uint8_t device) { uint16_t ebda_seg = read_word(0x0040,0x000E); /* Check if buffer is large enough. */ if (dpt->size < 0x1a) return -1; /* Fill in EDD 1.x table. */ if (dpt->size >= 0x1a) { uint64_t lba; dpt->size = 0x1a; dpt->blksize = bios_dsk->devices[device].blksize; if (bios_dsk->devices[device].device == DSK_DEVICE_CDROM) { dpt->infos = 0x74; /* Removable, media change, lockable, max values */ dpt->cylinders = 0xffffffff; dpt->heads = 0xffffffff; dpt->spt = 0xffffffff; dpt->sector_count1 = 0xffffffff; dpt->sector_count2 = 0xffffffff; } else { dpt->infos = 0x02; // geometry is valid dpt->cylinders = bios_dsk->devices[device].pchs.cylinders; dpt->heads = bios_dsk->devices[device].pchs.heads; dpt->spt = bios_dsk->devices[device].pchs.spt; lba = bios_dsk->devices[device].sectors; dpt->sector_count1 = lba; dpt->sector_count2 = lba >> 32; } } /* Fill in EDD 2.x table. */ if (dpt->size >= 0x1e) { uint8_t channel, irq, mode, checksum, i, xlation; uint16_t iobase1, iobase2, options; dpt->size = 0x1e; dpt->dpte_segment = ebda_seg; dpt->dpte_offset = (uint16_t)&EbdaData->bdisk.dpte; // Fill in dpte channel = device / 2; iobase1 = bios_dsk->channels[channel].iobase1; iobase2 = bios_dsk->channels[channel].iobase2; irq = bios_dsk->channels[channel].irq; mode = bios_dsk->devices[device].mode; xlation = bios_dsk->devices[device].translation; options = (xlation == GEO_TRANSLATION_NONE ? 0 : 1 << 3); /* CHS translation */ options |= (1 << 4); /* LBA translation */ if (bios_dsk->devices[device].device == DSK_DEVICE_CDROM) { options |= (1 << 5); /* Removable device */ options |= (1 << 6); /* ATAPI device */ } #if VBOX_BIOS_CPU >= 80386 options |= (mode == ATA_MODE_PIO32 ? 1 : 0 << 7); #endif options |= (xlation == GEO_TRANSLATION_LBA ? 1 : 0 << 9); options |= (xlation == GEO_TRANSLATION_RECHS ? 3 : 0 << 9); bios_dsk->dpte.iobase1 = iobase1; bios_dsk->dpte.iobase2 = iobase2; bios_dsk->dpte.prefix = (0xe | (device % 2)) << 4; bios_dsk->dpte.unused = 0xcb; bios_dsk->dpte.irq = irq; bios_dsk->dpte.blkcount = 1; bios_dsk->dpte.dma = 0; bios_dsk->dpte.pio = 0; bios_dsk->dpte.options = options; bios_dsk->dpte.reserved = 0; bios_dsk->dpte.revision = 0x11; checksum = 0; for (i = 0; i < 15; ++i) checksum += read_byte(ebda_seg, (uint16_t)&EbdaData->bdisk.dpte + i); checksum = -checksum; bios_dsk->dpte.checksum = checksum; } /* Fill in EDD 3.x table. */ if (dpt->size >= 0x42) { uint8_t channel, iface, checksum, i; uint16_t iobase1; channel = device / 2; iface = bios_dsk->channels[channel].iface; iobase1 = bios_dsk->channels[channel].iobase1; dpt->size = 0x42; dpt->key = 0xbedd; dpt->dpi_length = 0x24; dpt->reserved1 = 0; dpt->reserved2 = 0; if (iface == ATA_IFACE_ISA) { dpt->host_bus[0] = 'I'; dpt->host_bus[1] = 'S'; dpt->host_bus[2] = 'A'; dpt->host_bus[3] = ' '; } else { // FIXME PCI } dpt->iface_type[0] = 'A'; dpt->iface_type[1] = 'T'; dpt->iface_type[2] = 'A'; dpt->iface_type[3] = ' '; dpt->iface_type[4] = ' '; dpt->iface_type[5] = ' '; dpt->iface_type[6] = ' '; dpt->iface_type[7] = ' '; if (iface == ATA_IFACE_ISA) { ((uint16_t __far *)dpt->iface_path)[0] = iobase1; ((uint16_t __far *)dpt->iface_path)[1] = 0; ((uint32_t __far *)dpt->iface_path)[1] = 0; } else { // FIXME PCI } ((uint16_t __far *)dpt->device_path)[0] = device & 1; // device % 2; @todo: correct? ((uint16_t __far *)dpt->device_path)[1] = 0; ((uint32_t __far *)dpt->device_path)[1] = 0; checksum = 0; for (i = 30; i < 64; i++) checksum += ((uint8_t __far *)dpt)[i]; checksum = -checksum; dpt->checksum = checksum; } return 0; } void BIOSCALL int13_harddisk(disk_regs_t r) { uint32_t lba; uint16_t cylinder, head, sector; uint16_t nlc, nlh, nlspt; uint16_t count; uint8_t device, status; bio_dsk_t __far *bios_dsk; BX_DEBUG_INT13_HD("%s: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x\n", __func__, AX, BX, CX, DX, ES); SET_IF(); /* INT 13h always returns with interrupts enabled. */ bios_dsk = read_word(0x0040,0x000E) :> &EbdaData->bdisk; write_byte(0x0040, 0x008e, 0); // clear completion flag // basic check : device has to be defined if ( (GET_ELDL() < 0x80) || (GET_ELDL() >= 0x80 + BX_MAX_STORAGE_DEVICES) ) { BX_DEBUG("%s: function %02x, ELDL out of range %02x\n", __func__, GET_AH(), GET_ELDL()); goto int13_fail; } // Get the ata channel device = bios_dsk->hdidmap[GET_ELDL()-0x80]; // basic check : device has to be valid if (device >= BX_MAX_STORAGE_DEVICES) { BX_DEBUG("%s: function %02x, unmapped device for ELDL=%02x\n", __func__, GET_AH(), GET_ELDL()); goto int13_fail; } switch (GET_AH()) { case 0x00: /* disk controller reset */ #ifdef VBOX_WITH_SCSI /* SCSI controller does not need a reset. */ if (!VBOX_IS_SCSI_DEVICE(device)) #endif ata_reset (device); goto int13_success; break; case 0x01: /* read disk status */ status = read_byte(0x0040, 0x0074); SET_AH(status); SET_DISK_RET_STATUS(0); /* set CF if error status read */ if (status) goto int13_fail_nostatus; else goto int13_success_noah; break; case 0x02: // read disk sectors case 0x03: // write disk sectors case 0x04: // verify disk sectors count = GET_AL(); cylinder = GET_CH(); cylinder |= ( ((uint16_t) GET_CL()) << 2) & 0x300; sector = (GET_CL() & 0x3f); head = GET_DH(); /* Segment and offset are in ES:BX. */ if ( (count > 128) || (count == 0) ) { BX_INFO("%s: function %02x, count out of range!\n", __func__, GET_AH()); goto int13_fail; } /* Get the logical CHS geometry. */ nlc = bios_dsk->devices[device].lchs.cylinders; nlh = bios_dsk->devices[device].lchs.heads; nlspt = bios_dsk->devices[device].lchs.spt; /* Sanity check the geometry. */ if( (cylinder >= nlc) || (head >= nlh) || (sector > nlspt )) { BX_INFO("%s: function %02x, disk %02x, parameters out of range %04x/%04x/%04x!\n", __func__, GET_AH(), GET_DL(), cylinder, head, sector); goto int13_fail; } // FIXME verify if ( GET_AH() == 0x04 ) goto int13_success; /* If required, translate LCHS to LBA and execute command. */ /// @todo The IS_SCSI_DEVICE check should be redundant... if (( (bios_dsk->devices[device].pchs.heads != nlh) || (bios_dsk->devices[device].pchs.spt != nlspt)) || VBOX_IS_SCSI_DEVICE(device)) { lba = ((((uint32_t)cylinder * (uint32_t)nlh) + (uint32_t)head) * (uint32_t)nlspt) + (uint32_t)sector - 1; sector = 0; // this forces the command to be lba BX_DEBUG_INT13_HD("%s: %d sectors from lba %lu @ %04x:%04x\n", __func__, count, lba, ES, BX); } else { BX_DEBUG_INT13_HD("%s: %d sectors from C/H/S %u/%u/%u @ %04x:%04x\n", __func__, count, cylinder, head, sector, ES, BX); } /* Clear the count of transferred sectors/bytes. */ bios_dsk->drqp.trsfsectors = 0; bios_dsk->drqp.trsfbytes = 0; /* Pass request information to low level disk code. */ bios_dsk->drqp.lba = lba; bios_dsk->drqp.buffer = MK_FP(ES, BX); bios_dsk->drqp.nsect = count; bios_dsk->drqp.sect_sz = 512; /// @todo device specific? bios_dsk->drqp.cylinder = cylinder; bios_dsk->drqp.head = head; bios_dsk->drqp.sector = sector; bios_dsk->drqp.dev_id = device; status = dskacc[bios_dsk->devices[device].type].a[GET_AH() - 0x02](bios_dsk); // Set nb of sector transferred SET_AL(bios_dsk->drqp.trsfsectors); if (status != 0) { BX_INFO("%s: function %02x, error %02x !\n", __func__, GET_AH(), status); SET_AH(0x0c); goto int13_fail_noah; } goto int13_success; break; case 0x05: /* format disk track */ BX_INFO("format disk track called\n"); goto int13_success; break; case 0x08: /* read disk drive parameters */ /* Get the logical geometry from internal table. */ nlc = bios_dsk->devices[device].lchs.cylinders; nlh = bios_dsk->devices[device].lchs.heads; nlspt = bios_dsk->devices[device].lchs.spt; count = bios_dsk->hdcount; /* Maximum cylinder number is just one less than the number of cylinders. */ nlc = nlc - 1; /* 0 based , last sector not used */ SET_AL(0); SET_CH(nlc & 0xff); SET_CL(((nlc >> 2) & 0xc0) | (nlspt & 0x3f)); SET_DH(nlh - 1); SET_DL(count); /* FIXME returns 0, 1, or n hard drives */ // FIXME should set ES & DI /// @todo Actually, the above comment is nonsense. goto int13_success; break; case 0x10: /* check drive ready */ // should look at 40:8E also??? #ifdef VBOX_WITH_SCSI /* SCSI drives are always "ready". */ if (!VBOX_IS_SCSI_DEVICE(device)) { #endif // Read the status from controller status = inb(bios_dsk->channels[device/2].iobase1 + ATA_CB_STAT); if ( (status & ( ATA_CB_STAT_BSY | ATA_CB_STAT_RDY )) == ATA_CB_STAT_RDY ) { goto int13_success; } else { SET_AH(0xAA); goto int13_fail_noah; } #ifdef VBOX_WITH_SCSI } else /* It's not an ATA drive. */ goto int13_success; #endif break; case 0x15: /* read disk drive size */ /* Get the physical geometry from internal table. */ cylinder = bios_dsk->devices[device].pchs.cylinders; head = bios_dsk->devices[device].pchs.heads; sector = bios_dsk->devices[device].pchs.spt; /* Calculate sector count seen by old style INT 13h. */ lba = (uint32_t)cylinder * head * sector; CX = lba >> 16; DX = lba & 0xffff; SET_AH(3); // hard disk accessible goto int13_success_noah; break; case 0x09: /* initialize drive parameters */ case 0x0c: /* seek to specified cylinder */ case 0x0d: /* alternate disk reset */ case 0x11: /* recalibrate */ case 0x14: /* controller internal diagnostic */ BX_INFO("%s: function %02xh unimplemented, returns success\n", __func__, GET_AH()); goto int13_success; break; case 0x0a: /* read disk sectors with ECC */ case 0x0b: /* write disk sectors with ECC */ case 0x18: // set media type for format default: BX_INFO("%s: function %02xh unsupported, returns fail\n", __func__, GET_AH()); goto int13_fail; break; } int13_fail: SET_AH(0x01); // defaults to invalid function in AH or invalid parameter int13_fail_noah: SET_DISK_RET_STATUS(GET_AH()); int13_fail_nostatus: SET_CF(); // error occurred return; int13_success: SET_AH(0x00); // no error int13_success_noah: SET_DISK_RET_STATUS(0x00); CLEAR_CF(); // no error return; } void BIOSCALL int13_harddisk_ext(disk_regs_t r) { uint64_t lba; uint16_t segment, offset; uint8_t device, status; uint16_t count; uint8_t type; bio_dsk_t __far *bios_dsk; int13ext_t __far *i13_ext; #if 0 uint16_t ebda_seg = read_word(0x0040,0x000E); uint16_t npc, nph, npspt; uint16_t size; dpt_t __far *dpt; #endif bios_dsk = read_word(0x0040,0x000E) :> &EbdaData->bdisk; BX_DEBUG_INT13_HD("%s: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x DS=%04x SI=%04x\n", __func__, AX, BX, CX, DX, ES, DS, SI); write_byte(0x0040, 0x008e, 0); // clear completion flag // basic check : device has to be defined if ( (GET_ELDL() < 0x80) || (GET_ELDL() >= 0x80 + BX_MAX_STORAGE_DEVICES) ) { BX_DEBUG("%s: function %02x, ELDL out of range %02x\n", __func__, GET_AH(), GET_ELDL()); goto int13x_fail; } // Get the ata channel device = bios_dsk->hdidmap[GET_ELDL()-0x80]; // basic check : device has to be valid if (device >= BX_MAX_STORAGE_DEVICES) { BX_DEBUG("%s: function %02x, unmapped device for ELDL=%02x\n", __func__, GET_AH(), GET_ELDL()); goto int13x_fail; } switch (GET_AH()) { case 0x41: // IBM/MS installation check BX=0xaa55; // install check SET_AH(0x30); // EDD 3.0 CX=0x0007; // ext disk access and edd, removable supported goto int13x_success_noah; break; case 0x42: // IBM/MS extended read case 0x43: // IBM/MS extended write case 0x44: // IBM/MS verify case 0x47: // IBM/MS extended seek /* Get a pointer to the extended structure. */ i13_ext = DS :> (int13ext_t *)SI; count = i13_ext->count; segment = i13_ext->segment; offset = i13_ext->offset; // Get 64 bits lba and check lba = i13_ext->lba2; lba <<= 32; lba |= i13_ext->lba1; BX_DEBUG_INT13_HD("%s: %d sectors from LBA 0x%llx @ %04x:%04x\n", __func__, count, lba, segment, offset); type = bios_dsk->devices[device].type; if (lba >= bios_dsk->devices[device].sectors) { BX_INFO("%s: function %02x. LBA out of range\n", __func__, GET_AH()); goto int13x_fail; } /* Don't bother with seek or verify. */ if (( GET_AH() == 0x44 ) || ( GET_AH() == 0x47 )) goto int13x_success; /* Clear the count of transferred sectors/bytes. */ bios_dsk->drqp.trsfsectors = 0; bios_dsk->drqp.trsfbytes = 0; /* Pass request information to low level disk code. */ bios_dsk->drqp.lba = lba; bios_dsk->drqp.buffer = MK_FP(segment, offset); bios_dsk->drqp.nsect = count; bios_dsk->drqp.sect_sz = 512; /// @todo device specific? bios_dsk->drqp.sector = 0; /* Indicate LBA. */ bios_dsk->drqp.dev_id = device; /* Execute the read or write command. */ status = dskacc[type].a[GET_AH() - 0x42](bios_dsk); count = bios_dsk->drqp.trsfsectors; i13_ext->count = count; if (status != 0) { BX_INFO("%s: function %02x, error %02x !\n", __func__, GET_AH(), status); SET_AH(0x0c); goto int13x_fail_noah; } goto int13x_success; break; case 0x45: // IBM/MS lock/unlock drive case 0x49: // IBM/MS extended media change goto int13x_success; // Always success for HD break; case 0x46: // IBM/MS eject media SET_AH(0xb2); // Volume Not Removable goto int13x_fail_noah; // Always fail for HD break; case 0x48: // IBM/MS get drive parameters if (edd_fill_dpt(DS :> (dpt_t *)SI, bios_dsk, device)) goto int13x_fail; else goto int13x_success; break; case 0x4e: // // IBM/MS set hardware configuration // DMA, prefetch, PIO maximum not supported switch (GET_AL()) { case 0x01: case 0x03: case 0x04: case 0x06: goto int13x_success; break; default : goto int13x_fail; } break; case 0x50: // IBM/MS send packet command default: BX_INFO("%s: function %02xh unsupported, returns fail\n", __func__, GET_AH()); goto int13x_fail; break; } int13x_fail: SET_AH(0x01); // defaults to invalid function in AH or invalid parameter int13x_fail_noah: SET_DISK_RET_STATUS(GET_AH()); SET_CF(); // error occurred return; int13x_success: SET_AH(0x00); // no error int13x_success_noah: SET_DISK_RET_STATUS(0x00); CLEAR_CF(); // no error return; } /* Avoid saving general registers already saved by caller (PUSHA). */ #pragma aux int13_harddisk modify [di si cx dx bx]; #pragma aux int13_harddisk_ext modify [di si cx dx bx];