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 SET_BDA(ivecs[i].seg, SEG_BIOS);
37 SET_BDA(ivecs[i].offset, OFFSET_dummy_iret_handler);
40 SET_BDA(mem_size_kb, BASE_MEM_IN_K);
42 // mov CMOS Equipment Byte to BDA Equipment Word
43 SET_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 SET_BDA(ivecs[0x79].seg, 0);
52 SET_BDA(ivecs[0x79].offset, 0);
54 SET_BDA(ivecs[0x40].offset, OFFSET_entry_40);
55 SET_BDA(ivecs[0x0e].offset, OFFSET_entry_0e);
56 SET_BDA(ivecs[0x13].offset, OFFSET_entry_13);
57 SET_BDA(ivecs[0x76].offset, OFFSET_entry_76);
58 SET_BDA(ivecs[0x17].offset, OFFSET_entry_17);
59 SET_BDA(ivecs[0x18].offset, OFFSET_entry_18);
60 SET_BDA(ivecs[0x19].offset, OFFSET_entry_19);
61 SET_BDA(ivecs[0x1c].offset, OFFSET_entry_1c);
62 SET_BDA(ivecs[0x12].offset, OFFSET_entry_12);
63 SET_BDA(ivecs[0x11].offset, OFFSET_entry_11);
64 SET_BDA(ivecs[0x15].offset, OFFSET_entry_15);
65 SET_BDA(ivecs[0x08].offset, OFFSET_entry_08);
66 SET_BDA(ivecs[0x09].offset, OFFSET_entry_09);
67 SET_BDA(ivecs[0x16].offset, OFFSET_entry_16);
68 SET_BDA(ivecs[0x14].offset, OFFSET_entry_14);
69 SET_BDA(ivecs[0x1a].offset, OFFSET_entry_1a);
70 SET_BDA(ivecs[0x70].offset, OFFSET_entry_70);
71 SET_BDA(ivecs[0x74].offset, OFFSET_entry_74);
72 SET_BDA(ivecs[0x75].offset, OFFSET_entry_75);
73 SET_BDA(ivecs[0x10].offset, OFFSET_entry_10);
79 memset(ebda, 0, sizeof(*ebda));
80 ebda->size = EBDA_SIZE;
81 SET_BDA(ebda_seg, EBDA_SEG);
82 SET_BDA(ivecs[0x41].seg, EBDA_SEG);
83 SET_BDA(ivecs[0x41].offset
84 , offsetof(struct extended_bios_data_area_s, fdpt0));
85 SET_BDA(ivecs[0x46].seg, EBDA_SEG);
86 SET_BDA(ivecs[0x41].offset
87 , offsetof(struct extended_bios_data_area_s, fdpt1));
93 // timer0: binary count, 16bit count, mode 2
94 outb(0x34, PORT_PIT_MODE);
95 // maximum count of 0000H = 18.2Hz
96 outb(0x0, PORT_PIT_COUNTER0);
97 outb(0x0, PORT_PIT_COUNTER0);
100 //--------------------------------------------------------------------------
102 //--------------------------------------------------------------------------
104 keyboard_panic(u16 status)
106 // If you're getting a 993 keyboard panic here,
107 // please see the comment in keyboard_init
109 BX_PANIC("Keyboard error:%u\n",status);
116 while ((inb(PORT_PS2_STATUS) & 0x02) && (--max > 0))
117 outb(code, PORT_DIAG);
118 if (!max && code != 0xff)
119 keyboard_panic(code);
123 kbd_waitdata(u8 code)
126 while ( ((inb(PORT_PS2_STATUS) & 0x01) == 0) && (--max>0) )
127 outb(code, PORT_DIAG);
129 keyboard_panic(code);
132 //--------------------------------------------------------------------------
134 //--------------------------------------------------------------------------
135 // this file is based on LinuxBIOS implementation of keyboard.c
139 /* ------------------- Flush buffers ------------------------*/
140 /* Wait until buffer is empty */
143 /* flush incoming keys */
146 outb(0x00, PORT_DIAG);
147 if (inb(PORT_PS2_STATUS) & 0x01) {
153 // Due to timer issues, and if the IPS setting is > 15000000,
154 // the incoming keys might not be flushed here. That will
155 // cause a panic a few lines below. See sourceforge bug report :
156 // [ 642031 ] FATAL: Keyboard RESET error:993
158 /* ------------------- controller side ----------------------*/
159 /* send cmd = 0xAA, self test 8042 */
160 outb(0xaa, PORT_PS2_STATUS);
165 /* read self-test result, 0x55 should be returned from 0x60 */
166 if (inb(PORT_PS2_DATA) != 0x55)
169 /* send cmd = 0xAB, keyboard interface test */
170 outb(0xab, PORT_PS2_STATUS);
175 /* read keyboard interface test result, */
176 /* 0x00 should be returned form 0x60 */
177 if (inb(PORT_PS2_DATA) != 0x00)
180 /* Enable Keyboard clock */
181 outb(0xae, PORT_PS2_STATUS);
182 outb(0xa8, PORT_PS2_STATUS);
184 /* ------------------- keyboard side ------------------------*/
185 /* reset kerboard and self test (keyboard side) */
186 outb(0xff, PORT_PS2_DATA);
191 /* keyboard should return ACK */
192 if (inb(PORT_PS2_DATA) != 0xfa)
197 if (inb(PORT_PS2_DATA) != 0xaa)
200 /* Disable keyboard */
201 outb(0xf5, PORT_PS2_DATA);
206 /* keyboard should return ACK */
207 if (inb(PORT_PS2_DATA) != 0xfa)
210 /* Write Keyboard Mode */
211 outb(0x60, PORT_PS2_STATUS);
215 /* send cmd: scan code convert, disable mouse, enable IRQ 1 */
216 outb(0x61, PORT_PS2_DATA);
220 /* Enable keyboard */
221 outb(0xf4, PORT_PS2_DATA);
226 /* keyboard should return ACK */
227 if (inb(PORT_PS2_DATA) != 0xfa)
230 outb(0x77, PORT_DIAG);
236 u16 x = offsetof(struct bios_data_area_s, kbd_buf) - 0x400;
237 SET_BDA(kbd_mode, 0x10);
238 SET_BDA(kbd_buf_head, x);
239 SET_BDA(kbd_buf_tail, x);
240 SET_BDA(kbd_buf_start_offset, x);
242 SET_BDA(kbd_buf_end_offset, x + sizeof(bda->kbd_buf));
248 detect_parport(u16 port, u8 timeout, u8 count)
251 outb(inb(port+2) & 0xdf, port+2);
254 if (inb(port) != 0xaa)
257 SET_BDA(port_lpt[count], port);
258 SET_BDA(lpt_timeout[count], timeout);
266 count += detect_parport(0x378, 0x14, count);
267 count += detect_parport(0x278, 0x14, count);
269 // Equipment word bits 14..15 determing # parallel ports
270 u16 eqb = GET_BDA(equipment_list_flags);
271 SET_BDA(equipment_list_flags, (eqb & 0x3fff) | (count << 14));
275 detect_serial(u16 port, u8 timeout, u8 count)
278 if (inb(port+1) != 0x02)
280 if (inb(port+2) != 0x02)
283 SET_BDA(port_com[count], port);
284 SET_BDA(com_timeout[count], timeout);
292 count += detect_serial(0x3f8, 0x0a, count);
293 count += detect_serial(0x2f8, 0x0a, count);
294 count += detect_serial(0x3e8, 0x0a, count);
295 count += detect_serial(0x2e8, 0x0a, count);
297 // Equipment word bits 9..11 determing # serial ports
298 u16 eqb = GET_BDA(equipment_list_flags);
299 SET_BDA(equipment_list_flags, (eqb & 0xf1ff) | (count << 9));
305 return (val & 0xf) + ((val >> 4) * 10);
311 u32 seconds = bcd2bin(inb_cmos(CMOS_RTC_SECONDS));
312 u32 ticks = (seconds * 18206507) / 1000000;
313 u32 minutes = bcd2bin(inb_cmos(CMOS_RTC_MINUTES));
314 ticks += (minutes * 10923904) / 10000;
315 u32 hours = bcd2bin(inb_cmos(CMOS_RTC_HOURS));
316 ticks += (hours * 65543427) / 1000;
317 SET_BDA(timer_counter, ticks);
318 SET_BDA(timer_rollover, 0);
324 outb(0x11, PORT_PIC1);
325 outb(0x11, PORT_PIC2);
326 outb(0x08, PORT_PIC1_DATA);
327 outb(0x70, PORT_PIC2_DATA);
328 outb(0x04, PORT_PIC1_DATA);
329 outb(0x02, PORT_PIC2_DATA);
330 outb(0x01, PORT_PIC1_DATA);
331 outb(0x01, PORT_PIC2_DATA);
332 outb(0xb8, PORT_PIC1_DATA);
333 if (CONFIG_PS2_MOUSE)
334 outb(0x8f, PORT_PIC2_DATA);
336 outb(0x9f, PORT_PIC2_DATA);
342 u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
348 SET_BDA(floppy_harddisk_info, out);
349 outb(0x02, PORT_DMA1_MASK_REG);
351 SET_BDA(ivecs[0x1E].offset, OFFSET_diskette_param_table2);
357 // hdidmap and cdidmap init.
359 for (device=0; device < CONFIG_MAX_ATA_DEVICES; device++) {
360 ebda->ata.idmap[0][device] = CONFIG_MAX_ATA_DEVICES;
361 ebda->ata.idmap[1][device] = CONFIG_MAX_ATA_DEVICES;
366 fill_hdinfo(struct fdpt_s *info, u8 typecmos, u8 basecmos)
368 u8 type = inb_cmos(typecmos);
373 info->precompensation = (inb_cmos(basecmos+4) << 8) | inb_cmos(basecmos+3);
374 info->drive_control_byte = inb_cmos(basecmos+5);
375 info->landing_zone = (inb_cmos(basecmos+7) << 8) | inb_cmos(basecmos+6);
376 u16 cyl = (inb_cmos(basecmos+1) << 8) | inb_cmos(basecmos+0);
377 u8 heads = inb_cmos(basecmos+2);
378 u8 sectors = inb_cmos(basecmos+8);
380 // no logical CHS mapping used, just physical CHS
381 // use Standard Fixed Disk Parameter Table (FDPT)
382 info->cylinders = cyl;
384 info->sectors = sectors;
388 // complies with Phoenix style Translated Fixed Disk Parameter
390 info->phys_cylinders = cyl;
391 info->phys_heads = heads;
392 info->phys_sectors = sectors;
393 info->sectors = sectors;
394 info->a0h_signature = 0xa0;
398 } else if (cyl > 4096) {
401 } else if (cyl > 2048) {
405 info->cylinders = cyl;
407 info->checksum = ~checksum((u8*)info, sizeof(*info)-1) + 1;
413 outb(0x0a, 0x03f6); // 0000 1010 = reserved, disable IRQ 14
414 SET_BDA(disk_count, 1);
415 SET_BDA(disk_control_byte, 0xc0);
417 // move disk geometry data from CMOS to EBDA disk parameter table(s)
418 u8 diskinfo = inb_cmos(CMOS_DISK_DATA);
419 if ((diskinfo & 0xf0) == 0xf0)
420 // Fill EBDA table for hard disk 0.
421 fill_hdinfo(&ebda->fdpt0, CMOS_DISK_DRIVE1_TYPE, CMOS_DISK_DRIVE1_CYL);
422 if ((diskinfo & 0x0f) == 0x0f)
423 // XXX - bochs halts on any other type
424 // Fill EBDA table for hard disk 1.
425 fill_hdinfo(&ebda->fdpt0, CMOS_DISK_DRIVE2_TYPE, CMOS_DISK_DRIVE2_CYL);
432 // Clear out the IPL table.
433 memset(ipl, 0, sizeof(*ipl));
436 struct ipl_entry_s *ip = &ipl->table[0];
437 ip->type = IPL_TYPE_FLOPPY;
441 ip->type = IPL_TYPE_HARDDISK;
445 if (CONFIG_CDROM_BOOT) {
446 ip->type = IPL_TYPE_CDROM;
450 ipl->count = ip - ipl->table;
451 ipl->sequence = 0xffff;
455 callrom(u16 seg, u16 offset)
458 memset(&br, 0, sizeof(br));
460 br.di = OFFSET_pnp_string + 1; // starts 1 past for alignment
467 rom_scan(u32 start, u32 end)
470 for (; p <= (u8*)end; p += 2048) {
472 if (*(u16*)rom != 0xaa55)
474 u32 len = rom[2] * 512;
475 if (checksum(rom, len) != 0)
477 p = (u8*)(((u32)p + len) / 2048 * 2048);
478 callrom(PTR_TO_SEG(rom), PTR_TO_OFFSET(rom + 3));
480 // Look at the ROM's PnP Expansion header. Properly, we're supposed
481 // to init all the ROMs and then go back and build an IPL table of
482 // all the bootable devices, but we can get away with one pass.
483 if (rom[0x1a] != '$' || rom[0x1b] != 'P'
484 || rom[0x1c] != 'n' || rom[0x1d] != 'P')
486 // 0x1A is also the offset into the expansion header of...
487 // the Bootstrap Entry Vector, or zero if there is none.
488 u16 entry = *(u16*)&rom[0x1a+0x1a];
491 // Found a device that thinks it can boot the system. Record
492 // its BEV and product name string.
494 if (ipl->count >= ARRAY_SIZE(ipl->table))
497 struct ipl_entry_s *ip = &ipl->table[ipl->count];
498 ip->type = IPL_TYPE_BEV;
499 ip->vector = (PTR_TO_SEG(rom) << 16) | entry;
501 u16 desc = *(u16*)&rom[0x1a+0x10];
503 ip->description = (PTR_TO_SEG(rom) << 16) | desc;
512 BX_INFO("Start bios\n");
525 rom_scan(0xc0000, 0xc7800);
527 printf("BIOS - begin\n\n");
540 // XXX - original bios calls ata_detect before rom scan.
541 rom_scan(0xc8000, 0xe0000);
543 // reset the memory (some boot loaders such as syslinux suppose
544 // that the memory is set to zero)
545 memset((void*)0x40000, 0, 0x40000); // XXX - shouldn't use globals
547 callrom(SEG_BIOS, OFFSET_begin_boot);
553 // first reset the DMA controllers
554 outb(0, PORT_DMA1_MASTER_CLEAR);
555 outb(0, PORT_DMA2_MASTER_CLEAR);
557 // then initialize the DMA controllers
558 outb(0xc0, PORT_DMA2_MODE_REG);
559 outb(0x00, PORT_DMA2_MASK_REG);
563 check_restart_status()
565 // Get and then clear CMOS shutdown status.
566 u8 status = inb_cmos(CMOS_RESET_CODE);
567 outb_cmos(0, CMOS_RESET_CODE);
569 if (status == 0x00 || status == 0x09 || status >= 0x0d)
573 if (status != 0x05) {
574 BX_PANIC("Unimplemented shutdown status: %02x\n", status);
578 // XXX - this is supposed to jump without changing any memory -
579 // but the stack has been altered by the time the code gets here.
582 memset(&br, 0, sizeof(br));
583 br.cs = GET_BDA(jump_cs_ip) >> 16;
584 br.ip = GET_BDA(jump_cs_ip);
592 check_restart_status();