#include "biosvar.h" // struct bregs
#include "util.h" // irq_disable
#include "cmos.h" // inb_cmos
+#include "pic.h" // unmask_pic1
-#define BX_FLOPPY_ON_CNT 37 /* 2 seconds */
-
-// XXX - //.org 0xefc7
+#define DEBUGF1(fmt, args...) bprintf(0, fmt , ##args)
+#define DEBUGF(fmt, args...)
-// Since no provisions are made for multiple drive types, most
-// values in this table are ignored. I set parameters for 1.44M
-// floppy here
-char diskette_param_table[11] = {
- 0xAF,
- 0x02, // head load time 0000001, DMA used
- 0x25,
- 0x02,
- 18,
- 0x1B,
- 0xFF,
- 0x6C,
- 0xF6,
- 0x0F,
- 0x08,
-};
+#define BX_FLOPPY_ON_CNT 37 /* 2 seconds */
// New diskette parameter table adding 3 parameters from IBM
// Since no provisions are made for multiple drive types, most
// values in this table are ignored. I set parameters for 1.44M
// floppy here
-char diskette_param_table2[14] VISIBLE = {
- 0xAF,
- 0x02, // head load time 0000001, DMA used
- 0x25,
- 0x02,
- 18,
- 0x1B,
- 0xFF,
- 0x6C,
- 0xF6,
- 0x0F,
- 0x08,
- 79, // maximum track
- 0, // data transfer rate
- 4, // drive type in cmos
+struct floppy_ext_dbt_s diskette_param_table2 VISIBLE16 = {
+ .dbt = {
+ .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,
+ },
+ .max_track = 79, // maximum track
+ .data_rate = 0, // data transfer rate
+ .drive_type = 4, // drive type in cmos
};
-// Oddities:
-// Return codes vary greatly - AL not cleared consistenlty, BDA return
-// status not set consistently, sometimes panics.
-// Extra outb(0x000a, 0x02) in read?
-// Does not disable interrupts on failure paths.
-// numfloppies used before set in int_1308
-// int_1305 verifies track but doesn't use it?
+void
+floppy_drive_setup()
+{
+ if (! CONFIG_FLOPPY_SUPPORT)
+ return;
+ dprintf(3, "init floppy drives\n");
+ u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
+ u8 out = 0;
+ u8 num_floppies = 0;
+
+ if (type & 0xf0) {
+ out |= 0x07;
+ num_floppies++;
+ }
+ if (type & 0x0f) {
+ out |= 0x70;
+ num_floppies++;
+ }
+ SET_BDA(floppy_harddisk_info, out);
+
+ // Update equipment word bits for floppy
+ if (num_floppies == 1)
+ // 1 drive, ready for boot
+ SETBITS_BDA(equipment_list_flags, 0x01);
+ else if (num_floppies == 2)
+ // 2 drives, ready for boot
+ SETBITS_BDA(equipment_list_flags, 0x41);
+
+ outb(0x02, PORT_DMA1_MASK_REG);
+
+ // Enable IRQ6 (handle_0e)
+ unmask_pic1(PIC1_IRQ6);
+}
static inline void
set_diskette_current_cyl(u8 drive, u8 cyl)
if (prev_reset == 0) {
irq_enable();
u8 v;
- do {
+ for (;;) {
v = GET_BDA(floppy_recalibration_status);
- } while ((v & FRS_TIMEOUT) == 0);
+ if (v & FRS_TIMEOUT)
+ break;
+ cpu_relax();
+ }
irq_disable();
v &= ~FRS_TIMEOUT;
irq_enable();
u8 v;
- do {
+ for (;;) {
if (!GET_BDA(floppy_motor_counter)) {
irq_disable();
floppy_reset_controller();
return DISK_RET_ETIMEOUT;
}
v = GET_BDA(floppy_recalibration_status);
- } while (!(v & FRS_TIMEOUT));
+ if (v & FRS_TIMEOUT)
+ break;
+ cpu_relax();
+ }
irq_disable();
v &= ~FRS_TIMEOUT;
SET_BDA(floppy_recalibration_status, v);
- if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
- BX_PANIC("int13_diskette: ctrl not ready\n");
-
return 0;
}
// read
mode_register = 0x46;
- DEBUGF("floppy dma c2");
+ //DEBUGF("floppy dma c2\n");
outb(0x06, PORT_DMA1_MASK_REG);
outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
outb(base_address, PORT_DMA_ADDR_2);
if (ret)
return ret;
+ // check port 3f4 for accessibility to status bytes
+ if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
+ BX_PANIC("int13_diskette: ctrl not ready\n");
+
// read 7 return status bytes from controller
u8 i;
for (i=0; i<7; i++) {
return rv;
}
-static inline void
-floppy_ret(struct bregs *regs, u8 code)
+#define floppy_ret(regs, code) \
+ __floppy_ret(__func__, (regs), (code))
+
+void
+__floppy_ret(const char *fname, struct bregs *regs, u8 code)
{
- regs->ah = code;
SET_BDA(floppy_last_status, code);
- set_cf(regs, code);
+ if (code)
+ __set_code_fail(fname, regs, code);
+ else
+ set_code_success(regs);
}
static inline void
floppy_fail(struct bregs *regs, u8 code)
{
- regs->al = 0; // no sectors read
floppy_ret(regs, code);
+ regs->al = 0; // no sectors read
}
static u16
{
// see if drive exists
if (drive > 1 || !get_drive_type(drive)) {
+ // XXX - return type doesn't match
floppy_fail(regs, DISK_RET_ETIMEOUT);
return 1;
}
if (head > 1 || sector == 0 || num_sectors == 0
|| track > 79 || num_sectors > 72) {
- BX_INFO("int13_diskette: read/write/verify: parameter out of range\n");
floppy_fail(regs, DISK_RET_EPARAM);
return;
}
if (head > 1 || sector == 0 || num_sectors == 0
|| track > 79 || num_sectors > 72) {
- BX_INFO("int13_diskette: read/write/verify: parameter out of range\n");
floppy_fail(regs, DISK_RET_EPARAM);
return;
}
if (data[0] & 0xc0) {
if (data[1] & 0x02) {
+ set_fail(regs);
regs->ax = 0x0300;
- set_cf(regs, 1);
return;
}
BX_PANIC("int13_diskette_function: read error\n");
if (head > 1 || sector == 0 || num_sectors == 0
|| track > 79 || num_sectors > 72) {
- BX_INFO("int13_diskette: read/write/verify: parameter out of range\n");
floppy_fail(regs, DISK_RET_EPARAM);
return;
}
u8 head = regs->dh;
if (head > 1 || num_sectors == 0 || num_sectors > 18) {
- BX_INFO("int13_diskette: read/write/verify: parameter out of range\n");
floppy_fail(regs, DISK_RET_EPARAM);
return;
}
if (data[0] & 0xc0) {
if (data[1] & 0x02) {
+ set_fail(regs);
regs->ax = 0x0300;
- set_cf(regs, 1);
return;
}
BX_PANIC("int13_diskette_function: read error\n");
regs->es = 0;
regs->di = 0;
regs->dl = num_floppies;
- set_cf(regs, 0);
+ set_success(regs);
return;
}
/* set es & di to point to 11 byte diskette param table in ROM */
regs->es = SEG_BIOS;
- regs->di = (u16)diskette_param_table2;
+ regs->di = (u32)&diskette_param_table2;
/* disk status not changed upon success */
}
{
DEBUGF("floppy f15\n");
if (drive > 1) {
+ set_fail(regs);
regs->ah = 0; // only 2 drives supported
// set_diskette_ret_status here ???
- set_cf(regs, 1);
return;
}
u8 drive_type = get_drive_type(drive);
regs->ah = (drive_type != 0);
- set_cf(regs, 0);
+ set_success(regs);
}
// get diskette change line status
static void
floppy_13XX(struct bregs *regs, u8 drive)
{
- BX_INFO("int13_diskette: unsupported AH=%02x\n", GET_AH());
floppy_ret(regs, DISK_RET_EPARAM);
}
void
floppy_13(struct bregs *regs, u8 drive)
{
- if (CONFIG_FLOPPY_SUPPORT) {
- switch (regs->ah) {
- case 0x00: floppy_1300(regs, drive); break;
- case 0x01: floppy_1301(regs, drive); break;
- case 0x02: floppy_1302(regs, drive); break;
- case 0x03: floppy_1303(regs, drive); break;
- case 0x04: floppy_1304(regs, drive); break;
- case 0x05: floppy_1305(regs, drive); break;
- case 0x08: floppy_1308(regs, drive); break;
- case 0x15: floppy_1315(regs, drive); break;
- case 0x16: floppy_1316(regs, drive); break;
- default: floppy_13XX(regs, drive); break;
- }
- } else {
+ if (! CONFIG_FLOPPY_SUPPORT) {
+ // Minimal stubs
switch (regs->ah) {
case 0x01: floppy_1301(regs, drive); break;
default: floppy_13XX(regs, drive); break;
}
+ return;
+ }
+ switch (regs->ah) {
+ case 0x00: floppy_1300(regs, drive); break;
+ case 0x01: floppy_1301(regs, drive); break;
+ case 0x02: floppy_1302(regs, drive); break;
+ case 0x03: floppy_1303(regs, drive); break;
+ case 0x04: floppy_1304(regs, drive); break;
+ case 0x05: floppy_1305(regs, drive); break;
+ case 0x08: floppy_1308(regs, drive); break;
+ case 0x15: floppy_1315(regs, drive); break;
+ case 0x16: floppy_1316(regs, drive); break;
+ default: floppy_13XX(regs, drive); break;
}
}
// INT 0Eh Diskette Hardware ISR Entry Point
-void VISIBLE
-handle_0e(struct bregs *regs)
+void VISIBLE16
+handle_0e()
{
- //debug_enter(regs);
+ debug_isr(DEBUG_ISR_0e);
if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0) {
outb(0x08, PORT_FD_DATA); // sense interrupt status
while ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
inb(PORT_FD_DATA);
} while ((inb(PORT_FD_STATUS) & 0xc0) == 0xc0);
}
- eoi_master_pic();
+ eoi_pic1();
// diskette interrupt has occurred
SETBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
}
projects / seabios.git / blobdiff