// 16bit code to access floppy drives.
//
-// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
+// Copyright (C) 2008,2009 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.
.drive_type = 4, // drive type in cmos
};
+// Since no provisions are made for multiple drive types, most
+// values in this table are ignored. I set parameters for 1.44M
+// floppy here
+struct floppy_dbt_s diskette_param_table VAR16FIXED(0xefc7) = {
+ .specify1 = 0xAF,
+ .specify2 = 0x02, // head load time 0000001, DMA used
+ .shutoff_ticks = 0x25,
+ .bps_code = 0x02,
+ .sectors = 18,
+ .interblock_len = 0x1B,
+ .data_len = 0xFF,
+ .gap_len = 0x6C,
+ .fill_byte = 0xF6,
+ .settle_time = 0x0F,
+ .startup_time = 0x08,
+};
+
+u8 FloppyCount VAR16_32;
+u8 FloppyTypes[2] VAR16_32;
+
void
-floppy_drive_setup()
+floppy_setup()
{
if (! CONFIG_FLOPPY_SUPPORT)
return;
dprintf(3, "init floppy drives\n");
- if (CONFIG_COREBOOT)
- // XXX - disable floppies on coreboot for now.
- outb_cmos(0, CMOS_FLOPPY_DRIVE_TYPE);
- u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
- u8 out = 0;
- u8 num_floppies = 0;
+ FloppyCount = 0;
+ FloppyTypes[0] = FloppyTypes[1] = 0;
- if (type & 0xf0) {
- out |= 0x07;
- num_floppies++;
- }
- if (type & 0x0f) {
- out |= 0x70;
- num_floppies++;
+ u8 out = 0;
+ if (CONFIG_COREBOOT) {
+ // XXX - disable floppies on coreboot for now.
+ } else {
+ u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
+ if (type & 0xf0) {
+ out |= 0x07;
+ FloppyTypes[0] = type >> 4;
+ FloppyCount++;
+ }
+ if (type & 0x0f) {
+ out |= 0x70;
+ FloppyTypes[1] = type & 0x0f;
+ FloppyCount++;
+ }
}
SET_BDA(floppy_harddisk_info, out);
// Update equipment word bits for floppy
- if (num_floppies == 1)
+ if (FloppyCount == 1)
// 1 drive, ready for boot
SETBITS_BDA(equipment_list_flags, 0x01);
- else if (num_floppies == 2)
+ else if (FloppyCount == 2)
// 2 drives, ready for boot
SETBITS_BDA(equipment_list_flags, 0x41);
enable_hwirq(6, entry_0e);
}
-static inline void
-set_diskette_current_cyl(u8 drive, u8 cyl)
-{
- if (drive)
- SET_BDA(floppy_track1, cyl);
- else
- SET_BDA(floppy_track0, cyl);
-}
+#define floppy_ret(regs, code) \
+ __floppy_ret((regs), (code) | (__LINE__ << 8), __func__)
-static u16
-get_drive_type(u8 drive)
+void
+__floppy_ret(struct bregs *regs, u32 linecode, const char *fname)
{
- // check CMOS to see if drive exists
- u8 drive_type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
- if (drive == 0)
- drive_type >>= 4;
+ u8 code = linecode;
+ SET_BDA(floppy_last_status, code);
+ if (code)
+ __set_code_fail(regs, linecode, fname);
else
- drive_type &= 0x0f;
- return drive_type;
+ set_code_success(regs);
}
-static u16
-floppy_media_known(u8 drive)
-{
- if (!(GET_BDA(floppy_recalibration_status) & (1<<drive)))
- return 0;
- u8 v = GET_BDA(floppy_media_state[drive]);
- if (!(v & FMS_MEDIA_DRIVE_ESTABLISHED))
- return 0;
- return 1;
-}
+
+/****************************************************************
+ * Low-level floppy IO
+ ****************************************************************/
static void
floppy_reset_controller()
;
}
+static int
+wait_floppy_irq()
+{
+ irq_enable();
+ u8 v;
+ for (;;) {
+ if (!GET_BDA(floppy_motor_counter)) {
+ irq_disable();
+ return -1;
+ }
+ v = GET_BDA(floppy_recalibration_status);
+ if (v & FRS_TIMEOUT)
+ break;
+ cpu_relax();
+ }
+ irq_disable();
+
+ v &= ~FRS_TIMEOUT;
+ SET_BDA(floppy_recalibration_status, v);
+ return 0;
+}
+
static void
floppy_prepare_controller(u8 drive)
{
while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
;
- if (prev_reset == 0) {
- irq_enable();
- u8 v;
- for (;;) {
- v = GET_BDA(floppy_recalibration_status);
- if (v & FRS_TIMEOUT)
- break;
- cpu_relax();
- }
- irq_disable();
-
- v &= ~FRS_TIMEOUT;
- SET_BDA(floppy_recalibration_status, v);
- }
+ if (!prev_reset)
+ wait_floppy_irq();
}
static int
for (i=0; i<cmdlen; i++)
outb(cmd[i], PORT_FD_DATA);
- irq_enable();
- u8 v;
- for (;;) {
- if (!GET_BDA(floppy_motor_counter)) {
- irq_disable();
- floppy_reset_controller();
- return -1;
- }
- v = GET_BDA(floppy_recalibration_status);
- if (v & FRS_TIMEOUT)
- break;
- cpu_relax();
+ int ret = wait_floppy_irq();
+ if (ret) {
+ floppy_reset_controller();
+ return -1;
}
- irq_disable();
-
- v &= ~FRS_TIMEOUT;
- SET_BDA(floppy_recalibration_status, v);
return 0;
}
-#define floppy_ret(regs, code) \
- __floppy_ret((regs), (code) | (__LINE__ << 8), __func__)
-
-void
-__floppy_ret(struct bregs *regs, u32 linecode, const char *fname)
-{
- u8 code = linecode;
- SET_BDA(floppy_last_status, code);
- if (code)
- __set_code_fail(regs, linecode, fname);
- else
- set_code_success(regs);
-}
-
static int
floppy_cmd(struct bregs *regs, u16 count, u8 *cmd, u8 cmdlen)
{
// es:bx = pointer to where to place information from diskette
- u32 addr = (u32)MAKE_FARPTR(regs->es, regs->bx);
+ u32 addr = (u32)MAKE_FLATPTR(regs->es, regs->bx);
// check for 64K boundary overrun
u32 last_addr = addr + count;
}
// check port 3f4 for accessibility to status bytes
- if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
- BX_PANIC("int13_diskette: ctrl not ready\n");
+ if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0) {
+ floppy_ret(regs, DISK_RET_ECONTROLLER);
+ return -1;
+ }
// read 7 return status bytes from controller
u8 i;
return 0;
}
+
+/****************************************************************
+ * Floppy media sense
+ ****************************************************************/
+
+static inline void
+set_diskette_current_cyl(u8 drive, u8 cyl)
+{
+ SET_BDA(floppy_track[drive], cyl);
+}
+
static void
floppy_drive_recal(u8 drive)
{
set_diskette_current_cyl(drive, 0);
}
-static u16
+static int
floppy_media_sense(u8 drive)
{
- u16 rv;
- u8 config_data, media_state;
-
- floppy_drive_recal(drive);
-
// for now cheat and get drive type from CMOS,
// assume media is same as drive type
// 110 reserved
// 111 all other formats/drives
- switch (get_drive_type(drive)) {
+ int rv = 0;
+ u8 config_data, media_state;
+ switch (GET_GLOBAL(FloppyTypes[drive])) {
case 1:
// 360K 5.25" drive
config_data = 0x00; // 0000 0000
media_state = 0x25; // 0010 0101
- rv = 1;
break;
case 2:
// 1.2 MB 5.25" drive
config_data = 0x00; // 0000 0000
media_state = 0x25; // 0010 0101 // need double stepping??? (bit 5)
- rv = 1;
break;
case 3:
// 720K 3.5" drive
config_data = 0x00; // 0000 0000 ???
media_state = 0x17; // 0001 0111
- rv = 1;
break;
case 4:
// 1.44 MB 3.5" drive
config_data = 0x00; // 0000 0000
media_state = 0x17; // 0001 0111
- rv = 1;
break;
case 5:
// 2.88 MB 3.5" drive
config_data = 0xCC; // 1100 1100
media_state = 0xD7; // 1101 0111
- rv = 1;
break;
//
// Extended floppy size uses special cmos setting
// 160k 5.25" drive
config_data = 0x00; // 0000 0000
media_state = 0x27; // 0010 0111
- rv = 1;
break;
case 7:
// 180k 5.25" drive
config_data = 0x00; // 0000 0000
media_state = 0x27; // 0010 0111
- rv = 1;
break;
case 8:
// 320k 5.25" drive
config_data = 0x00; // 0000 0000
media_state = 0x27; // 0010 0111
- rv = 1;
break;
default:
// not recognized
config_data = 0x00; // 0000 0000
media_state = 0x00; // 0000 0000
- rv = 0;
+ rv = -1;
}
SET_BDA(floppy_last_data_rate, config_data);
check_drive(struct bregs *regs, u8 drive)
{
// see if drive exists
- if (drive > 1 || !get_drive_type(drive)) {
- // XXX - return type doesn't match
+ if (drive > 1 || !GET_GLOBAL(FloppyTypes[drive])) {
floppy_ret(regs, DISK_RET_ETIMEOUT);
return -1;
}
- // see if media in drive, and type is known
- if (floppy_media_known(drive) == 0 && floppy_media_sense(drive) == 0) {
+ if ((GET_BDA(floppy_recalibration_status) & (1<<drive))
+ && (GET_BDA(floppy_media_state[drive]) & FMS_MEDIA_DRIVE_ESTABLISHED))
+ // Media is known.
+ return 0;
+
+ // Recalibrate drive.
+ floppy_drive_recal(drive);
+
+ // Sense media.
+ int ret = floppy_media_sense(drive);
+ if (ret) {
floppy_ret(regs, DISK_RET_EMEDIA);
return -1;
}
return 0;
}
+
+/****************************************************************
+ * Floppy int13 handlers
+ ****************************************************************/
+
// diskette controller reset
static void
floppy_1300(struct bregs *regs, u8 drive)
floppy_ret(regs, DISK_RET_EPARAM);
return;
}
- if (!get_drive_type(drive)) {
+ if (!GET_GLOBAL(FloppyTypes[drive])) {
floppy_ret(regs, DISK_RET_ETIMEOUT);
return;
}
goto fail;
if (data[0] & 0xc0) {
- if (data[1] & 0x02) {
+ if (data[1] & 0x02)
floppy_ret(regs, DISK_RET_EWRITEPROTECT);
- goto fail;
- }
- BX_PANIC("int13_diskette_function: read error\n");
+ else
+ floppy_ret(regs, DISK_RET_ECONTROLLER);
+ goto fail;
}
// ??? should track be new val from return_status[3] ?
return;
if (data[0] & 0xc0) {
- if (data[1] & 0x02) {
+ if (data[1] & 0x02)
floppy_ret(regs, DISK_RET_EWRITEPROTECT);
- return;
- }
- BX_PANIC("int13_diskette_function: read error\n");
+ else
+ floppy_ret(regs, DISK_RET_ECONTROLLER);
+ return;
}
set_diskette_current_cyl(drive, 0);
{
dprintf(3, "floppy f08\n");
- u8 drive_type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
- u8 num_floppies = 0;
- if (drive_type & 0xf0)
- num_floppies++;
- if (drive_type & 0x0f)
- num_floppies++;
-
+ regs->ax = 0;
+ regs->dx = GET_GLOBAL(FloppyCount);
if (drive > 1) {
- regs->ax = 0;
regs->bx = 0;
regs->cx = 0;
- regs->dx = 0;
regs->es = 0;
regs->di = 0;
- regs->dl = num_floppies;
set_fail(regs);
return;
}
- if (drive == 0)
- drive_type >>= 4;
- else
- drive_type &= 0x0f;
-
- regs->bh = 0;
- regs->bl = drive_type;
- regs->ah = 0;
- regs->al = 0;
- regs->dl = num_floppies;
+ u8 drive_type = GET_GLOBAL(FloppyTypes[drive]);
+ regs->bx = drive_type;
switch (drive_type) {
+ default: // ?
+ dprintf(1, "floppy: int13: bad floppy type\n");
+ // NO BREAK
case 0: // none
regs->cx = 0;
regs->dh = 0; // max head #
break;
-
case 1: // 360KB, 5.25"
regs->cx = 0x2709; // 40 tracks, 9 sectors
regs->dh = 1; // max head #
break;
-
case 2: // 1.2MB, 5.25"
regs->cx = 0x4f0f; // 80 tracks, 15 sectors
regs->dh = 1; // max head #
break;
-
case 3: // 720KB, 3.5"
regs->cx = 0x4f09; // 80 tracks, 9 sectors
regs->dh = 1; // max head #
break;
-
case 4: // 1.44MB, 3.5"
regs->cx = 0x4f12; // 80 tracks, 18 sectors
regs->dh = 1; // max head #
break;
-
case 5: // 2.88MB, 3.5"
regs->cx = 0x4f24; // 80 tracks, 36 sectors
regs->dh = 1; // max head #
break;
-
case 6: // 160k, 5.25"
regs->cx = 0x2708; // 40 tracks, 8 sectors
regs->dh = 0; // max head #
break;
-
case 7: // 180k, 5.25"
regs->cx = 0x2709; // 40 tracks, 9 sectors
regs->dh = 0; // max head #
break;
-
case 8: // 320k, 5.25"
regs->cx = 0x2708; // 40 tracks, 8 sectors
regs->dh = 1; // max head #
break;
-
- default: // ?
- BX_PANIC("floppy: int13: bad floppy type\n");
}
/* set es & di to point to 11 byte diskette param table in ROM */
// set_diskette_ret_status here ???
return;
}
- u8 drive_type = get_drive_type(drive);
+ u8 drive_type = GET_GLOBAL(FloppyTypes[drive]);
regs->ah = (drive_type != 0);
set_success(regs);
}
}
+
+/****************************************************************
+ * HW irqs
+ ****************************************************************/
+
// INT 0Eh Diskette Hardware ISR Entry Point
void VISIBLE16
handle_0e()
projects / seabios.git / blobdiff