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seabios/src/disk.c

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// 16bit code to access hard drives.
//
// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2002 MandrakeSoft S.A.
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "disk.h" // floppy_13
#include "biosvar.h" // SET_BDA
#include "config.h" // CONFIG_*
#include "util.h" // debug_enter
#include "pic.h" // eoi_pic2
#include "bregs.h" // struct bregs
#include "pci.h" // pci_bdf_to_bus
#include "atabits.h" // ATA_CB_STAT
/****************************************************************
* Helper functions
****************************************************************/
void
__disk_ret(struct bregs *regs, u32 linecode, const char *fname)
{
u8 code = linecode;
SET_BDA(disk_last_status, code);
if (code)
__set_code_fail(regs, linecode, fname);
else
set_code_success(regs);
}
static void
__disk_stub(struct bregs *regs, int lineno, const char *fname)
{
__debug_stub(regs, lineno, fname);
__disk_ret(regs, DISK_RET_SUCCESS | (lineno << 8), fname);
}
#define DISK_STUB(regs) \
__disk_stub((regs), __LINE__, __func__)
static int
__send_disk_op(struct disk_op_s *op_p, u16 op_s)
{
struct disk_op_s dop;
memcpy_far(MAKE_FARPTR(GET_SEG(SS), &dop)
, MAKE_FARPTR(op_s, op_p)
, sizeof(dop));
dprintf(DEBUG_HDL_13, "disk_op d=%d lba=%d buf=%p count=%d cmd=%d\n"
, dop.driveid, (u32)dop.lba, dop.far_buffer
, dop.count, dop.command);
irq_enable();
int status;
if (dop.command == CMD_CDEMU_READ)
status = cdrom_read_512(&dop);
else if (dop.command == CMD_CDROM_READ)
status = cdrom_read(&dop);
else
status = ata_cmd_data(&dop);
irq_disable();
return status;
}
static int
send_disk_op(struct disk_op_s *op)
{
return stack_hop((u32)op, GET_SEG(SS), 0, __send_disk_op);
}
static void
basic_access(struct bregs *regs, u8 device, u16 command)
{
struct disk_op_s dop;
dop.lba = 0;
dop.driveid = device;
u8 type = GET_GLOBAL(ATA.devices[device].type);
u16 nlc, nlh, nlspt;
if (type == ATA_TYPE_ATA) {
nlc = GET_GLOBAL(ATA.devices[device].lchs.cylinders);
nlh = GET_GLOBAL(ATA.devices[device].lchs.heads);
nlspt = GET_GLOBAL(ATA.devices[device].lchs.spt);
dop.command = command;
} else {
// Must be cd emulation.
u16 ebda_seg = get_ebda_seg();
nlc = GET_EBDA2(ebda_seg, cdemu.cylinders);
nlh = GET_EBDA2(ebda_seg, cdemu.heads);
nlspt = GET_EBDA2(ebda_seg, cdemu.spt);
dop.lba = GET_EBDA2(ebda_seg, cdemu.ilba) * 4;
dop.command = CMD_CDEMU_READ;
}
dop.count = regs->al;
u16 cylinder = regs->ch | ((((u16) regs->cl) << 2) & 0x300);
u16 sector = regs->cl & 0x3f;
u16 head = regs->dh;
if (dop.count > 128 || dop.count == 0 || sector == 0) {
dprintf(1, "int13_harddisk: function %02x, parameter out of range!\n"
, regs->ah);
disk_ret(regs, DISK_RET_EPARAM);
return;
}
// sanity check on cyl heads, sec
if (cylinder >= nlc || head >= nlh || sector > nlspt) {
dprintf(1, "int13_harddisk: function %02x, parameters out of"
" range %04x/%04x/%04x!\n"
, regs->ah, cylinder, head, sector);
disk_ret(regs, DISK_RET_EPARAM);
return;
}
if (!command) {
// If verify or seek
disk_ret(regs, DISK_RET_SUCCESS);
return;
}
// translate lchs to lba
dop.lba += (((((u32)cylinder * (u32)nlh) + (u32)head) * (u32)nlspt)
+ (u32)sector - 1);
u16 segment = regs->es;
u16 offset = regs->bx;
dop.far_buffer = MAKE_FARPTR(segment, offset);
int status = send_disk_op(&dop);
// Set nb of sector transferred
regs->al = GET_EBDA(sector_count);
if (status != 0) {
dprintf(1, "int13_harddisk: function %02x, error %d!\n"
, regs->ah, status);
disk_ret(regs, DISK_RET_EBADTRACK);
return;
}
disk_ret(regs, DISK_RET_SUCCESS);
}
static void
extended_access(struct bregs *regs, u8 device, u16 command)
{
struct disk_op_s dop;
// Get lba and check.
dop.lba = GET_INT13EXT(regs, lba);
dop.command = command;
dop.driveid = device;
u8 type = GET_GLOBAL(ATA.devices[device].type);
if (type == ATA_TYPE_ATA) {
if (dop.lba >= GET_GLOBAL(ATA.devices[device].sectors)) {
dprintf(1, "int13_harddisk: function %02x. LBA out of range\n"
, regs->ah);
disk_ret(regs, DISK_RET_EPARAM);
return;
}
} else {
dop.command = CMD_CDROM_READ;
}
if (!command) {
// If verify or seek
disk_ret(regs, DISK_RET_SUCCESS);
return;
}
u16 segment = GET_INT13EXT(regs, segment);
u16 offset = GET_INT13EXT(regs, offset);
dop.far_buffer = MAKE_FARPTR(segment, offset);
dop.count = GET_INT13EXT(regs, count);
int status = send_disk_op(&dop);
SET_INT13EXT(regs, count, GET_EBDA(sector_count));
if (status != 0) {
dprintf(1, "int13_harddisk: function %02x, error %d!\n"
, regs->ah, status);
disk_ret(regs, DISK_RET_EBADTRACK);
return;
}
disk_ret(regs, DISK_RET_SUCCESS);
}
/****************************************************************
* Hard Drive functions
****************************************************************/
// disk controller reset
static void
disk_1300(struct bregs *regs, u8 device)
{
ata_reset(device);
}
// read disk status
static void
disk_1301(struct bregs *regs, u8 device)
{
u8 v = GET_BDA(disk_last_status);
regs->ah = v;
set_cf(regs, v);
// XXX - clear disk_last_status?
}
// read disk sectors
static void
disk_1302(struct bregs *regs, u8 device)
{
basic_access(regs, device, ATA_CMD_READ_SECTORS);
}
// write disk sectors
static void
disk_1303(struct bregs *regs, u8 device)
{
basic_access(regs, device, ATA_CMD_WRITE_SECTORS);
}
// verify disk sectors
static void
disk_1304(struct bregs *regs, u8 device)
{
basic_access(regs, device, 0);
// FIXME verify
}
// format disk track
static void
disk_1305(struct bregs *regs, u8 device)
{
DISK_STUB(regs);
}
// read disk drive parameters
static void
disk_1308(struct bregs *regs, u8 device)
{
// Get logical geometry from table
u16 nlc = GET_GLOBAL(ATA.devices[device].lchs.cylinders);
u16 nlh = GET_GLOBAL(ATA.devices[device].lchs.heads);
u16 nlspt = GET_GLOBAL(ATA.devices[device].lchs.spt);
u16 count = GET_BDA(hdcount);
nlc = nlc - 2; /* 0 based , last sector not used */
regs->al = 0;
regs->ch = nlc & 0xff;
regs->cl = ((nlc >> 2) & 0xc0) | (nlspt & 0x3f);
regs->dh = nlh - 1;
regs->dl = count; /* FIXME returns 0, 1, or n hard drives */
// FIXME should set ES & DI
disk_ret(regs, DISK_RET_SUCCESS);
}
// initialize drive parameters
static void
disk_1309(struct bregs *regs, u8 device)
{
DISK_STUB(regs);
}
// seek to specified cylinder
static void
disk_130c(struct bregs *regs, u8 device)
{
DISK_STUB(regs);
}
// alternate disk reset
static void
disk_130d(struct bregs *regs, u8 device)
{
DISK_STUB(regs);
}
// check drive ready
static void
disk_1310(struct bregs *regs, u8 device)
{
// should look at 40:8E also???
// Read the status from controller
u8 status = inb(GET_GLOBAL(ATA.channels[device/2].iobase1) + ATA_CB_STAT);
if ( (status & ( ATA_CB_STAT_BSY | ATA_CB_STAT_RDY )) == ATA_CB_STAT_RDY )
disk_ret(regs, DISK_RET_SUCCESS);
else
disk_ret(regs, DISK_RET_ENOTREADY);
}
// recalibrate
static void
disk_1311(struct bregs *regs, u8 device)
{
DISK_STUB(regs);
}
// controller internal diagnostic
static void
disk_1314(struct bregs *regs, u8 device)
{
DISK_STUB(regs);
}
// read disk drive size
static void
disk_1315(struct bregs *regs, u8 device)
{
// Get logical geometry from table
u16 nlc = GET_GLOBAL(ATA.devices[device].lchs.cylinders);
u16 nlh = GET_GLOBAL(ATA.devices[device].lchs.heads);
u16 nlspt = GET_GLOBAL(ATA.devices[device].lchs.spt);
// Compute sector count seen by int13
u32 lba = (u32)(nlc - 1) * (u32)nlh * (u32)nlspt;
regs->cx = lba >> 16;
regs->dx = lba & 0xffff;
disk_ret(regs, DISK_RET_SUCCESS);
regs->ah = 3; // hard disk accessible
}
// IBM/MS installation check
static void
disk_1341(struct bregs *regs, u8 device)
{
regs->bx = 0xaa55; // install check
regs->cx = 0x0007; // ext disk access and edd, removable supported
disk_ret(regs, DISK_RET_SUCCESS);
regs->ah = 0x30; // EDD 3.0
}
// IBM/MS extended read
static void
disk_1342(struct bregs *regs, u8 device)
{
extended_access(regs, device, ATA_CMD_READ_SECTORS);
}
// IBM/MS extended write
static void
disk_1343(struct bregs *regs, u8 device)
{
extended_access(regs, device, ATA_CMD_WRITE_SECTORS);
}
// IBM/MS verify
static void
disk_1344(struct bregs *regs, u8 device)
{
extended_access(regs, device, 0);
}
// IBM/MS lock/unlock drive
static void
disk_1345(struct bregs *regs, u8 device)
{
// Always success for HD
disk_ret(regs, DISK_RET_SUCCESS);
}
// IBM/MS eject media
static void
disk_1346(struct bregs *regs, u8 device)
{
// Volume Not Removable
disk_ret(regs, DISK_RET_ENOTREMOVABLE);
}
// IBM/MS extended seek
static void
disk_1347(struct bregs *regs, u8 device)
{
extended_access(regs, device, 0);
}
// IBM/MS get drive parameters
static void
disk_1348(struct bregs *regs, u8 device)
{
u16 size = GET_INT13DPT(regs, size);
// Buffer is too small
if (size < 26) {
disk_ret(regs, DISK_RET_EPARAM);
return;
}
// EDD 1.x
u8 type = GET_GLOBAL(ATA.devices[device].type);
u16 npc = GET_GLOBAL(ATA.devices[device].pchs.cylinders);
u16 nph = GET_GLOBAL(ATA.devices[device].pchs.heads);
u16 npspt = GET_GLOBAL(ATA.devices[device].pchs.spt);
u64 lba = GET_GLOBAL(ATA.devices[device].sectors);
u16 blksize = GET_GLOBAL(ATA.devices[device].blksize);
dprintf(DEBUG_HDL_13, "disk_1348 size=%d t=%d chs=%d,%d,%d lba=%d bs=%d\n"
, size, type, npc, nph, npspt, (u32)lba, blksize);
SET_INT13DPT(regs, size, 26);
if (type == ATA_TYPE_ATA) {
if (lba > (u64)npspt*nph*0x3fff) {
SET_INT13DPT(regs, infos, 0x00); // geometry is invalid
SET_INT13DPT(regs, cylinders, 0x3fff);
} else {
SET_INT13DPT(regs, infos, 0x02); // geometry is valid
SET_INT13DPT(regs, cylinders, (u32)npc);
}
SET_INT13DPT(regs, heads, (u32)nph);
SET_INT13DPT(regs, spt, (u32)npspt);
SET_INT13DPT(regs, sector_count, lba);
} else {
// ATAPI
// 0x74 = removable, media change, lockable, max values
SET_INT13DPT(regs, infos, 0x74);
SET_INT13DPT(regs, cylinders, 0xffffffff);
SET_INT13DPT(regs, heads, 0xffffffff);
SET_INT13DPT(regs, spt, 0xffffffff);
SET_INT13DPT(regs, sector_count, (u64)-1);
}
SET_INT13DPT(regs, blksize, blksize);
if (size < 30) {
disk_ret(regs, DISK_RET_SUCCESS);
return;
}
// EDD 2.x
u16 ebda_seg = get_ebda_seg();
SET_INT13DPT(regs, size, 30);
SET_INT13DPT(regs, dpte_segment, ebda_seg);
SET_INT13DPT(regs, dpte_offset
, offsetof(struct extended_bios_data_area_s, dpte));
// Fill in dpte
u8 channel = device / 2;
u8 slave = device % 2;
u16 iobase1 = GET_GLOBAL(ATA.channels[channel].iobase1);
u16 iobase2 = GET_GLOBAL(ATA.channels[channel].iobase2);
u8 irq = GET_GLOBAL(ATA.channels[channel].irq);
u8 mode = GET_GLOBAL(ATA.devices[device].mode);
u16 options = 0;
if (type == ATA_TYPE_ATA) {
u8 translation = GET_GLOBAL(ATA.devices[device].translation);
if (translation != ATA_TRANSLATION_NONE) {
options |= 1<<3; // CHS translation
if (translation == ATA_TRANSLATION_LBA)
options |= 1<<9;
if (translation == ATA_TRANSLATION_RECHS)
options |= 3<<9;
}
} else {
// ATAPI
options |= 1<<5; // removable device
options |= 1<<6; // atapi device
}
options |= 1<<4; // lba translation
if (mode == ATA_MODE_PIO32)
options |= 1<<7;
SET_EBDA2(ebda_seg, dpte.iobase1, iobase1);
SET_EBDA2(ebda_seg, dpte.iobase2, iobase2 + ATA_CB_DC);
SET_EBDA2(ebda_seg, dpte.prefix, ((slave ? ATA_CB_DH_DEV1 : ATA_CB_DH_DEV0)
| ATA_CB_DH_LBA));
SET_EBDA2(ebda_seg, dpte.unused, 0xcb);
SET_EBDA2(ebda_seg, dpte.irq, irq);
SET_EBDA2(ebda_seg, dpte.blkcount, 1);
SET_EBDA2(ebda_seg, dpte.dma, 0);
SET_EBDA2(ebda_seg, dpte.pio, 0);
SET_EBDA2(ebda_seg, dpte.options, options);
SET_EBDA2(ebda_seg, dpte.reserved, 0);
SET_EBDA2(ebda_seg, dpte.revision, 0x11);
u8 *p = MAKE_FARPTR(ebda_seg
, offsetof(struct extended_bios_data_area_s, dpte));
SET_EBDA2(ebda_seg, dpte.checksum, -checksum(p, 15));
if (size < 66) {
disk_ret(regs, DISK_RET_SUCCESS);
return;
}
// EDD 3.x
SET_INT13DPT(regs, key, 0xbedd);
SET_INT13DPT(regs, dpi_length, 36);
SET_INT13DPT(regs, reserved1, 0);
SET_INT13DPT(regs, reserved2, 0);
SET_INT13DPT(regs, host_bus[0], 'P');
SET_INT13DPT(regs, host_bus[1], 'C');
SET_INT13DPT(regs, host_bus[2], 'I');
SET_INT13DPT(regs, host_bus[3], 0);
u32 bdf = GET_GLOBAL(ATA.channels[channel].pci_bdf);
u32 path = (pci_bdf_to_bus(bdf) | (pci_bdf_to_dev(bdf) << 8)
| (pci_bdf_to_fn(bdf) << 16));
SET_INT13DPT(regs, iface_path, path);
SET_INT13DPT(regs, iface_type[0], 'A');
SET_INT13DPT(regs, iface_type[1], 'T');
SET_INT13DPT(regs, iface_type[2], 'A');
SET_INT13DPT(regs, iface_type[3], 0);
SET_INT13DPT(regs, iface_type[4], 0);
SET_INT13DPT(regs, iface_type[5], 0);
SET_INT13DPT(regs, iface_type[6], 0);
SET_INT13DPT(regs, iface_type[7], 0);
SET_INT13DPT(regs, device_path, slave);
SET_INT13DPT(regs, checksum, -checksum(MAKE_FARPTR(regs->ds, 30), 35));
disk_ret(regs, DISK_RET_SUCCESS);
}
// IBM/MS extended media change
static void
disk_1349(struct bregs *regs, u8 device)
{
// Always success for HD
disk_ret(regs, DISK_RET_SUCCESS);
}
static void
disk_134e01(struct bregs *regs, u8 device)
{
disk_ret(regs, DISK_RET_SUCCESS);
}
static void
disk_134e03(struct bregs *regs, u8 device)
{
disk_ret(regs, DISK_RET_SUCCESS);
}
static void
disk_134e04(struct bregs *regs, u8 device)
{
disk_ret(regs, DISK_RET_SUCCESS);
}
static void
disk_134e06(struct bregs *regs, u8 device)
{
disk_ret(regs, DISK_RET_SUCCESS);
}
static void
disk_134eXX(struct bregs *regs, u8 device)
{
disk_ret(regs, DISK_RET_EPARAM);
}
// IBM/MS set hardware configuration
static void
disk_134e(struct bregs *regs, u8 device)
{
switch (regs->al) {
case 0x01: disk_134e01(regs, device); break;
case 0x03: disk_134e03(regs, device); break;
case 0x04: disk_134e04(regs, device); break;
case 0x06: disk_134e06(regs, device); break;
default: disk_134eXX(regs, device); break;
}
}
void
disk_13XX(struct bregs *regs, u8 device)
{
disk_ret(regs, DISK_RET_EPARAM);
}
void
disk_13(struct bregs *regs, u8 device)
{
//debug_stub(regs);
// clear completion flag
SET_BDA(disk_interrupt_flag, 0);
switch (regs->ah) {
case 0x00: disk_1300(regs, device); break;
case 0x01: disk_1301(regs, device); break;
case 0x02: disk_1302(regs, device); break;
case 0x03: disk_1303(regs, device); break;
case 0x04: disk_1304(regs, device); break;
case 0x05: disk_1305(regs, device); break;
case 0x08: disk_1308(regs, device); break;
case 0x09: disk_1309(regs, device); break;
case 0x0c: disk_130c(regs, device); break;
case 0x0d: disk_130d(regs, device); break;
case 0x10: disk_1310(regs, device); break;
case 0x11: disk_1311(regs, device); break;
case 0x14: disk_1314(regs, device); break;
case 0x15: disk_1315(regs, device); break;
case 0x41: disk_1341(regs, device); break;
case 0x42: disk_1342(regs, device); break;
case 0x43: disk_1343(regs, device); break;
case 0x44: disk_1344(regs, device); break;
case 0x45: disk_1345(regs, device); break;
case 0x46: disk_1346(regs, device); break;
case 0x47: disk_1347(regs, device); break;
case 0x48: disk_1348(regs, device); break;
case 0x49: disk_1349(regs, device); break;
case 0x4e: disk_134e(regs, device); break;
default: disk_13XX(regs, device); break;
}
}
/****************************************************************
* Entry points
****************************************************************/
static u8
get_device(struct bregs *regs, u8 iscd, u8 drive)
{
// basic check : device has to be defined
if (drive >= CONFIG_MAX_ATA_DEVICES) {
disk_ret(regs, DISK_RET_EPARAM);
return CONFIG_MAX_ATA_DEVICES;
}
// Get the ata channel
u8 device = GET_GLOBAL(ATA.idmap[iscd][drive]);
// basic check : device has to be valid
if (device >= CONFIG_MAX_ATA_DEVICES) {
disk_ret(regs, DISK_RET_EPARAM);
return CONFIG_MAX_ATA_DEVICES;
}
return device;
}
static void
handle_legacy_disk(struct bregs *regs, u8 drive)
{
if (drive < 0x80) {
floppy_13(regs, drive);
return;
}
if (! CONFIG_ATA) {
// XXX - old code had other disk access method.
disk_ret(regs, DISK_RET_EPARAM);
return;
}
if (drive >= 0xe0) {
u8 device = get_device(regs, 1, drive - 0xe0);
if (device >= CONFIG_MAX_ATA_DEVICES)
return;
cdrom_13(regs, device);
return;
}
u8 device = get_device(regs, 0, drive - 0x80);
if (device >= CONFIG_MAX_ATA_DEVICES)
return;
disk_13(regs, device);
}
void VISIBLE16
handle_40(struct bregs *regs)
{
debug_enter(regs, DEBUG_HDL_40);
handle_legacy_disk(regs, regs->dl);
}
// INT 13h Fixed Disk Services Entry Point
void VISIBLE16
handle_13(struct bregs *regs)
{
debug_enter(regs, DEBUG_HDL_13);
u8 drive = regs->dl;
if (CONFIG_CDROM_EMU) {
if (regs->ah == 0x4b) {
cdemu_134b(regs);
return;
}
u16 ebda_seg = get_ebda_seg();
if (GET_EBDA2(ebda_seg, cdemu.active)) {
if (drive == GET_EBDA2(ebda_seg, cdemu.emulated_drive)) {
cdemu_13(regs);
return;
}
if (drive < 0xe0)
drive--;
}
}
handle_legacy_disk(regs, drive);
}
// record completion in BIOS task complete flag
void VISIBLE16
handle_76()
{
debug_isr(DEBUG_ISR_76);
SET_BDA(disk_interrupt_flag, 0xff);
eoi_pic2();
}
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