1 // 32bit code to Power On Self Test (POST) a machine.
3 // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
4 // Copyright (C) 2002 MandrakeSoft S.A.
6 // This file may be distributed under the terms of the GNU GPLv3 license.
8 #include "ioport.h" // PORT_*
9 #include "../out/rom16.offset.auto.h" // OFFSET_*
10 #include "config.h" // CONFIG_*
11 #include "cmos.h" // CMOS_*
12 #include "util.h" // memset
13 #include "biosvar.h" // struct bios_data_area_s
15 #define bda ((struct bios_data_area_s *)0)
16 #define ebda ((struct extended_bios_data_area_s *)(EBDA_SEG<<4))
17 #define ipl ((struct ipl_s *)(IPL_SEG<<4))
20 checksum(u8 *p, u32 len)
32 memset(bda, 0, sizeof(*bda));
35 for (i=0; i<256; i++) {
36 bda->ivecs[i].seg = SEG_BIOS;
37 bda->ivecs[i].offset = OFFSET_dummy_iret_handler;
40 bda->mem_size_kb = BASE_MEM_IN_K;
42 // mov CMOS Equipment Byte to BDA Equipment Word
43 bda->equipment_list_flags = inb_cmos(CMOS_EQUIPMENT_INFO);
49 // set vector 0x79 to zero
50 // this is used by 'gardian angel' protection system
51 bda->ivecs[0x79].seg = 0;
52 bda->ivecs[0x79].offset = 0;
54 bda->ivecs[0x40].offset = OFFSET_entry_40;
55 bda->ivecs[0x0e].offset = OFFSET_entry_0e;
56 bda->ivecs[0x13].offset = OFFSET_entry_13;
57 bda->ivecs[0x76].offset = OFFSET_entry_76;
58 bda->ivecs[0x17].offset = OFFSET_entry_17;
59 bda->ivecs[0x18].offset = OFFSET_entry_18;
60 bda->ivecs[0x19].offset = OFFSET_entry_19;
61 bda->ivecs[0x1c].offset = OFFSET_entry_1c;
62 bda->ivecs[0x12].offset = OFFSET_entry_12;
63 bda->ivecs[0x11].offset = OFFSET_entry_11;
64 bda->ivecs[0x15].offset = OFFSET_entry_15;
65 bda->ivecs[0x08].offset = OFFSET_entry_08;
66 bda->ivecs[0x09].offset = OFFSET_entry_09;
67 bda->ivecs[0x16].offset = OFFSET_entry_16;
68 bda->ivecs[0x14].offset = OFFSET_entry_14;
69 bda->ivecs[0x1a].offset = OFFSET_entry_1a;
70 bda->ivecs[0x70].offset = OFFSET_entry_70;
71 bda->ivecs[0x74].offset = OFFSET_entry_74;
72 bda->ivecs[0x75].offset = OFFSET_entry_75;
73 bda->ivecs[0x10].offset = OFFSET_entry_10;
79 memset(ebda, 0, sizeof(*ebda));
80 ebda->size = EBDA_SIZE;
81 bda->ebda_seg = EBDA_SEG;
82 bda->ivecs[0x41].seg = EBDA_SEG;
83 bda->ivecs[0x41].offset = offsetof(struct extended_bios_data_area_s, fdpt0);
84 bda->ivecs[0x46].seg = EBDA_SEG;
85 bda->ivecs[0x41].offset = offsetof(struct extended_bios_data_area_s, fdpt1);
91 // timer0: binary count, 16bit count, mode 2
92 outb(0x34, PORT_PIT_MODE);
93 // maximum count of 0000H = 18.2Hz
94 outb(0x0, PORT_PIT_COUNTER0);
95 outb(0x0, PORT_PIT_COUNTER0);
98 //--------------------------------------------------------------------------
100 //--------------------------------------------------------------------------
102 keyboard_panic(u16 status)
104 // If you're getting a 993 keyboard panic here,
105 // please see the comment in keyboard_init
107 BX_PANIC("Keyboard error:%u\n",status);
114 while ((inb(PORT_PS2_STATUS) & 0x02) && (--max > 0))
115 outb(code, PORT_DIAG);
116 if (!max && code != 0xff)
117 keyboard_panic(code);
121 kbd_waitdata(u8 code)
124 while ( ((inb(PORT_PS2_STATUS) & 0x01) == 0) && (--max>0) )
125 outb(code, PORT_DIAG);
127 keyboard_panic(code);
130 //--------------------------------------------------------------------------
132 //--------------------------------------------------------------------------
133 // this file is based on LinuxBIOS implementation of keyboard.c
137 /* ------------------- Flush buffers ------------------------*/
138 /* Wait until buffer is empty */
141 /* flush incoming keys */
144 outb(0x00, PORT_DIAG);
145 if (inb(PORT_PS2_STATUS) & 0x01) {
151 // Due to timer issues, and if the IPS setting is > 15000000,
152 // the incoming keys might not be flushed here. That will
153 // cause a panic a few lines below. See sourceforge bug report :
154 // [ 642031 ] FATAL: Keyboard RESET error:993
156 /* ------------------- controller side ----------------------*/
157 /* send cmd = 0xAA, self test 8042 */
158 outb(0xaa, PORT_PS2_STATUS);
163 /* read self-test result, 0x55 should be returned from 0x60 */
164 if (inb(PORT_PS2_DATA) != 0x55)
167 /* send cmd = 0xAB, keyboard interface test */
168 outb(0xab, PORT_PS2_STATUS);
173 /* read keyboard interface test result, */
174 /* 0x00 should be returned form 0x60 */
175 if (inb(PORT_PS2_DATA) != 0x00)
178 /* Enable Keyboard clock */
179 outb(0xae, PORT_PS2_STATUS);
180 outb(0xa8, PORT_PS2_STATUS);
182 /* ------------------- keyboard side ------------------------*/
183 /* reset kerboard and self test (keyboard side) */
184 outb(0xff, PORT_PS2_DATA);
189 /* keyboard should return ACK */
190 if (inb(PORT_PS2_DATA) != 0xfa)
195 if (inb(PORT_PS2_DATA) != 0xaa)
198 /* Disable keyboard */
199 outb(0xf5, PORT_PS2_DATA);
204 /* keyboard should return ACK */
205 if (inb(PORT_PS2_DATA) != 0xfa)
208 /* Write Keyboard Mode */
209 outb(0x60, PORT_PS2_STATUS);
213 /* send cmd: scan code convert, disable mouse, enable IRQ 1 */
214 outb(0x61, PORT_PS2_DATA);
218 /* Enable keyboard */
219 outb(0xf4, PORT_PS2_DATA);
224 /* keyboard should return ACK */
225 if (inb(PORT_PS2_DATA) != 0xfa)
228 outb(0x77, PORT_DIAG);
234 bda->kbd_mode = 0x10;
235 bda->kbd_buf_head = bda->kbd_buf_tail = bda->kbd_buf_start_offset
236 = offsetof(struct bios_data_area_s, kbd_buf) - 0x400;
237 bda->kbd_buf_end_offset
238 = (offsetof(struct bios_data_area_s, kbd_buf[sizeof(bda->kbd_buf)])
244 detect_parport(u16 port, u8 timeout, u8 count)
247 outb(inb(port+2) & 0xdf, port+2);
250 if (inb(port) != 0xaa)
253 bda->port_lpt[count] = port;
254 bda->lpt_timeout[count] = timeout;
262 count += detect_parport(0x378, 0x14, count);
263 count += detect_parport(0x278, 0x14, count);
265 // Equipment word bits 14..15 determing # parallel ports
266 u16 eqb = bda->equipment_list_flags;
267 bda->equipment_list_flags = (eqb & 0x3fff) | (count << 14);
271 detect_serial(u16 port, u8 timeout, u8 count)
274 if (inb(port+1) != 0x02)
276 if (inb(port+2) != 0x02)
279 bda->port_com[count] = port;
280 bda->com_timeout[count] = timeout;
288 count += detect_serial(0x3f8, 0x0a, count);
289 count += detect_serial(0x2f8, 0x0a, count);
290 count += detect_serial(0x3e8, 0x0a, count);
291 count += detect_serial(0x2e8, 0x0a, count);
293 // Equipment word bits 9..11 determing # serial ports
294 u16 eqb = bda->equipment_list_flags;
295 bda->equipment_list_flags = (eqb & 0xf1ff) | (count << 9);
301 return (val & 0xf) + ((val >> 4) * 10);
307 u32 seconds = bcd2bin(inb_cmos(CMOS_RTC_SECONDS));
308 u32 ticks = (seconds * 18206507) / 1000000;
309 u32 minutes = bcd2bin(inb_cmos(CMOS_RTC_MINUTES));
310 ticks += (minutes * 10923904) / 10000;
311 u32 hours = bcd2bin(inb_cmos(CMOS_RTC_HOURS));
312 ticks += (hours * 65543427) / 1000;
313 bda->timer_counter = ticks;
314 bda->timer_rollover = 0;
320 outb(0x11, PORT_PIC1);
321 outb(0x11, PORT_PIC2);
322 outb(0x08, PORT_PIC1_DATA);
323 outb(0x70, PORT_PIC2_DATA);
324 outb(0x04, PORT_PIC1_DATA);
325 outb(0x02, PORT_PIC2_DATA);
326 outb(0x01, PORT_PIC1_DATA);
327 outb(0x01, PORT_PIC2_DATA);
328 outb(0xb8, PORT_PIC1_DATA);
329 if (CONFIG_PS2_MOUSE)
330 outb(0x8f, PORT_PIC2_DATA);
332 outb(0x9f, PORT_PIC2_DATA);
338 u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
344 bda->floppy_harddisk_info = out;
345 outb(0x02, PORT_DMA1_MASK_REG);
347 bda->ivecs[0x1E].offset = OFFSET_diskette_param_table2;
353 // hdidmap and cdidmap init.
355 for (device=0; device < CONFIG_MAX_ATA_DEVICES; device++) {
356 ebda->ata.idmap[0][device] = CONFIG_MAX_ATA_DEVICES;
357 ebda->ata.idmap[1][device] = CONFIG_MAX_ATA_DEVICES;
362 fill_hdinfo(struct fdpt_s *info, u8 typecmos, u8 basecmos)
364 u8 type = inb_cmos(typecmos);
369 info->precompensation = (inb_cmos(basecmos+4) << 8) | inb_cmos(basecmos+3);
370 info->drive_control_byte = inb_cmos(basecmos+5);
371 info->landing_zone = (inb_cmos(basecmos+7) << 8) | inb_cmos(basecmos+6);
372 u16 cyl = (inb_cmos(basecmos+1) << 8) | inb_cmos(basecmos+0);
373 u8 heads = inb_cmos(basecmos+2);
374 u8 sectors = inb_cmos(basecmos+8);
376 // no logical CHS mapping used, just physical CHS
377 // use Standard Fixed Disk Parameter Table (FDPT)
378 info->cylinders = cyl;
380 info->sectors = sectors;
384 // complies with Phoenix style Translated Fixed Disk Parameter
386 info->phys_cylinders = cyl;
387 info->phys_heads = heads;
388 info->phys_sectors = sectors;
389 info->sectors = sectors;
390 info->a0h_signature = 0xa0;
394 } else if (cyl > 4096) {
397 } else if (cyl > 2048) {
401 info->cylinders = cyl;
403 info->checksum = ~checksum((u8*)info, sizeof(*info)-1) + 1;
409 outb(0x0a, 0x03f6); // 0000 1010 = reserved, disable IRQ 14
411 bda->disk_control_byte = 0xc0;
413 // move disk geometry data from CMOS to EBDA disk parameter table(s)
414 u8 diskinfo = inb_cmos(CMOS_DISK_DATA);
415 if ((diskinfo & 0xf0) == 0xf0)
416 // Fill EBDA table for hard disk 0.
417 fill_hdinfo(&ebda->fdpt0, CMOS_DISK_DRIVE1_TYPE, CMOS_DISK_DRIVE1_CYL);
418 if ((diskinfo & 0x0f) == 0x0f)
419 // XXX - bochs halts on any other type
420 // Fill EBDA table for hard disk 1.
421 fill_hdinfo(&ebda->fdpt0, CMOS_DISK_DRIVE2_TYPE, CMOS_DISK_DRIVE2_CYL);
428 // Clear out the IPL table.
429 memset(ipl, 0, sizeof(*ipl));
432 struct ipl_entry_s *ip = &ipl->table[0];
433 ip->type = IPL_TYPE_FLOPPY;
437 ip->type = IPL_TYPE_HARDDISK;
441 if (CONFIG_CDROM_BOOT) {
442 ip->type = IPL_TYPE_CDROM;
446 ipl->count = ip - ipl->table;
447 ipl->sequence = 0xffff;
451 callrom(u16 seg, u16 offset)
454 memset(&br, 0, sizeof(br));
456 br.di = OFFSET_pnp_string + 1; // starts 1 past for alignment
463 rom_scan(u32 start, u32 end)
466 for (; p <= (u8*)end; p += 2048) {
468 if (*(u16*)rom != 0xaa55)
470 u32 len = rom[2] * 512;
471 if (checksum(rom, len) != 0)
473 p = (u8*)(((u32)p + len) / 2048 * 2048);
474 callrom(PTR_TO_SEG(rom), PTR_TO_OFFSET(rom + 3));
476 // Look at the ROM's PnP Expansion header. Properly, we're supposed
477 // to init all the ROMs and then go back and build an IPL table of
478 // all the bootable devices, but we can get away with one pass.
479 if (rom[0x1a] != '$' || rom[0x1b] != 'P'
480 || rom[0x1c] != 'n' || rom[0x1d] != 'P')
482 // 0x1A is also the offset into the expansion header of...
483 // the Bootstrap Entry Vector, or zero if there is none.
484 u16 entry = *(u16*)&rom[0x1a+0x1a];
487 // Found a device that thinks it can boot the system. Record
488 // its BEV and product name string.
490 if (ipl->count >= ARRAY_SIZE(ipl->table))
493 struct ipl_entry_s *ip = &ipl->table[ipl->count];
494 ip->type = IPL_TYPE_BEV;
495 ip->vector = (PTR_TO_SEG(rom) << 16) | entry;
497 u16 desc = *(u16*)&rom[0x1a+0x10];
499 ip->description = (PTR_TO_SEG(rom) << 16) | desc;
508 BX_INFO("Start bios\n");
521 rom_scan(0xc0000, 0xc7800);
523 printf("BIOS - begin\n\n");
536 // XXX - original bios calls ata_detect before rom scan.
537 rom_scan(0xc8000, 0xe0000);
539 // reset the memory (some boot loaders such as syslinux suppose
540 // that the memory is set to zero)
541 memset((void*)0x40000, 0, 0x40000); // XXX - shouldn't use globals
543 callrom(SEG_BIOS, OFFSET_begin_boot);
549 // first reset the DMA controllers
550 outb(0, PORT_DMA1_MASTER_CLEAR);
551 outb(0, PORT_DMA2_MASTER_CLEAR);
553 // then initialize the DMA controllers
554 outb(0xc0, PORT_DMA2_MODE_REG);
555 outb(0x00, PORT_DMA2_MASK_REG);
559 check_restart_status()
561 // Get and then clear CMOS shutdown status.
562 u8 status = inb_cmos(CMOS_RESET_CODE);
563 outb_cmos(0, CMOS_RESET_CODE);
565 if (status == 0x00 || status == 0x09 || status >= 0x0d)
569 if (status != 0x05) {
570 BX_PANIC("Unimplemented shutdown status: %02x\n", status);
574 // XXX - this is supposed to jump without changing any memory -
575 // but the stack has been altered by the time the code gets here.
578 memset(&br, 0, sizeof(br));
579 br.cs = bda->jump_cs_ip >> 16;
580 br.ip = bda->jump_cs_ip;
588 check_restart_status();