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
14 #include "ata.h" // ata_detect
15 #include "kbd.h" // kbd_setup
16 #include "disk.h" // floppy_drive_setup
18 #define bda ((struct bios_data_area_s *)MAKE_FARPTR(SEG_BDA, 0))
19 #define ebda ((struct extended_bios_data_area_s *)MAKE_FARPTR(SEG_EBDA, 0))
24 memset(bda, 0, sizeof(*bda));
27 for (i=0; i<256; i++) {
28 SET_BDA(ivecs[i].seg, SEG_BIOS);
29 SET_BDA(ivecs[i].offset, OFFSET_dummy_iret_handler);
32 SET_BDA(mem_size_kb, BASE_MEM_IN_K);
34 // mov CMOS Equipment Byte to BDA Equipment Word
35 SET_BDA(equipment_list_flags, inb_cmos(CMOS_EQUIPMENT_INFO));
41 // set vector 0x79 to zero
42 // this is used by 'gardian angel' protection system
43 SET_BDA(ivecs[0x79].seg, 0);
44 SET_BDA(ivecs[0x79].offset, 0);
46 SET_BDA(ivecs[0x40].offset, OFFSET_entry_40);
47 SET_BDA(ivecs[0x0e].offset, OFFSET_entry_0e);
48 SET_BDA(ivecs[0x13].offset, OFFSET_entry_13);
49 SET_BDA(ivecs[0x76].offset, OFFSET_entry_76);
50 SET_BDA(ivecs[0x17].offset, OFFSET_entry_17);
51 SET_BDA(ivecs[0x18].offset, OFFSET_entry_18);
52 SET_BDA(ivecs[0x19].offset, OFFSET_entry_19);
53 SET_BDA(ivecs[0x1c].offset, OFFSET_entry_1c);
54 SET_BDA(ivecs[0x12].offset, OFFSET_entry_12);
55 SET_BDA(ivecs[0x11].offset, OFFSET_entry_11);
56 SET_BDA(ivecs[0x15].offset, OFFSET_entry_15);
57 SET_BDA(ivecs[0x08].offset, OFFSET_entry_08);
58 SET_BDA(ivecs[0x09].offset, OFFSET_entry_09);
59 SET_BDA(ivecs[0x16].offset, OFFSET_entry_16);
60 SET_BDA(ivecs[0x14].offset, OFFSET_entry_14);
61 SET_BDA(ivecs[0x1a].offset, OFFSET_entry_1a);
62 SET_BDA(ivecs[0x70].offset, OFFSET_entry_70);
63 SET_BDA(ivecs[0x74].offset, OFFSET_entry_74);
64 SET_BDA(ivecs[0x75].offset, OFFSET_entry_75);
65 SET_BDA(ivecs[0x10].offset, OFFSET_entry_10);
67 SET_BDA(ivecs[0x1E].offset, OFFSET_diskette_param_table2);
73 memset(ebda, 0, sizeof(*ebda));
74 ebda->size = EBDA_SIZE;
75 SET_BDA(ebda_seg, SEG_EBDA);
76 SET_BDA(ivecs[0x41].seg, SEG_EBDA);
77 SET_BDA(ivecs[0x41].offset
78 , offsetof(struct extended_bios_data_area_s, fdpt0));
79 SET_BDA(ivecs[0x46].seg, SEG_EBDA);
80 SET_BDA(ivecs[0x41].offset
81 , offsetof(struct extended_bios_data_area_s, fdpt1));
87 // timer0: binary count, 16bit count, mode 2
88 outb(0x34, PORT_PIT_MODE);
89 // maximum count of 0000H = 18.2Hz
90 outb(0x0, PORT_PIT_COUNTER0);
91 outb(0x0, PORT_PIT_COUNTER0);
95 detect_parport(u16 port, u8 timeout, u8 count)
98 outb(inb(port+2) & 0xdf, port+2);
101 if (inb(port) != 0xaa)
104 SET_BDA(port_lpt[count], port);
105 SET_BDA(lpt_timeout[count], timeout);
113 count += detect_parport(0x378, 0x14, count);
114 count += detect_parport(0x278, 0x14, count);
116 // Equipment word bits 14..15 determing # parallel ports
117 u16 eqb = GET_BDA(equipment_list_flags);
118 SET_BDA(equipment_list_flags, (eqb & 0x3fff) | (count << 14));
122 detect_serial(u16 port, u8 timeout, u8 count)
125 if (inb(port+1) != 0x02)
127 if (inb(port+2) != 0x02)
130 SET_BDA(port_com[count], port);
131 SET_BDA(com_timeout[count], timeout);
139 count += detect_serial(0x3f8, 0x0a, count);
140 count += detect_serial(0x2f8, 0x0a, count);
141 count += detect_serial(0x3e8, 0x0a, count);
142 count += detect_serial(0x2e8, 0x0a, count);
144 // Equipment word bits 9..11 determing # serial ports
145 u16 eqb = GET_BDA(equipment_list_flags);
146 SET_BDA(equipment_list_flags, (eqb & 0xf1ff) | (count << 9));
152 return (val & 0xf) + ((val >> 4) * 10);
158 u32 seconds = bcd2bin(inb_cmos(CMOS_RTC_SECONDS));
159 u32 ticks = (seconds * 18206507) / 1000000;
160 u32 minutes = bcd2bin(inb_cmos(CMOS_RTC_MINUTES));
161 ticks += (minutes * 10923904) / 10000;
162 u32 hours = bcd2bin(inb_cmos(CMOS_RTC_HOURS));
163 ticks += (hours * 65543427) / 1000;
164 SET_BDA(timer_counter, ticks);
165 SET_BDA(timer_rollover, 0);
171 outb(0x11, PORT_PIC1);
172 outb(0x11, PORT_PIC2);
173 outb(0x08, PORT_PIC1_DATA);
174 outb(0x70, PORT_PIC2_DATA);
175 outb(0x04, PORT_PIC1_DATA);
176 outb(0x02, PORT_PIC2_DATA);
177 outb(0x01, PORT_PIC1_DATA);
178 outb(0x01, PORT_PIC2_DATA);
179 outb(0xb8, PORT_PIC1_DATA);
180 if (CONFIG_PS2_MOUSE)
181 outb(0x8f, PORT_PIC2_DATA);
183 outb(0x9f, PORT_PIC2_DATA);
189 // hdidmap and cdidmap init.
191 for (device=0; device < CONFIG_MAX_ATA_DEVICES; device++) {
192 ebda->ata.idmap[0][device] = CONFIG_MAX_ATA_DEVICES;
193 ebda->ata.idmap[1][device] = CONFIG_MAX_ATA_DEVICES;
198 fill_hdinfo(struct fdpt_s *info, u8 typecmos, u8 basecmos)
200 u8 type = inb_cmos(typecmos);
205 info->precompensation = (inb_cmos(basecmos+4) << 8) | inb_cmos(basecmos+3);
206 info->drive_control_byte = inb_cmos(basecmos+5);
207 info->landing_zone = (inb_cmos(basecmos+7) << 8) | inb_cmos(basecmos+6);
208 u16 cyl = (inb_cmos(basecmos+1) << 8) | inb_cmos(basecmos+0);
209 u8 heads = inb_cmos(basecmos+2);
210 u8 sectors = inb_cmos(basecmos+8);
212 // no logical CHS mapping used, just physical CHS
213 // use Standard Fixed Disk Parameter Table (FDPT)
214 info->cylinders = cyl;
216 info->sectors = sectors;
220 // complies with Phoenix style Translated Fixed Disk Parameter
222 info->phys_cylinders = cyl;
223 info->phys_heads = heads;
224 info->phys_sectors = sectors;
225 info->sectors = sectors;
226 info->a0h_signature = 0xa0;
230 } else if (cyl > 4096) {
233 } else if (cyl > 2048) {
237 info->cylinders = cyl;
239 info->checksum = -checksum((u8*)info, sizeof(*info)-1);
245 outb(0x0a, PORT_HD_DATA); // 0000 1010 = reserved, disable IRQ 14
246 SET_BDA(disk_count, 1);
247 SET_BDA(disk_control_byte, 0xc0);
249 // move disk geometry data from CMOS to EBDA disk parameter table(s)
250 u8 diskinfo = inb_cmos(CMOS_DISK_DATA);
251 if ((diskinfo & 0xf0) == 0xf0)
252 // Fill EBDA table for hard disk 0.
253 fill_hdinfo(&ebda->fdpt0, CMOS_DISK_DRIVE1_TYPE, CMOS_DISK_DRIVE1_CYL);
254 if ((diskinfo & 0x0f) == 0x0f)
255 // XXX - bochs halts on any other type
256 // Fill EBDA table for hard disk 1.
257 fill_hdinfo(&ebda->fdpt1, CMOS_DISK_DRIVE2_TYPE, CMOS_DISK_DRIVE2_CYL);
264 struct ipl_entry_s *ip = &ebda->ipl.table[0];
265 ip->type = IPL_TYPE_FLOPPY;
269 ip->type = IPL_TYPE_HARDDISK;
273 if (CONFIG_CDROM_BOOT) {
274 ip->type = IPL_TYPE_CDROM;
278 ebda->ipl.count = ip - ebda->ipl.table;
279 ebda->ipl.sequence = 0xffff;
280 ebda->ipl.bootfirst = 0xffff;
284 callrom(u16 seg, u16 offset)
287 memset(&br, 0, sizeof(br));
289 br.di = OFFSET_pnp_string + 1; // starts 1 past for alignment
296 rom_scan(u32 start, u32 end)
299 for (; p <= (u8*)end; p += 2048) {
301 if (*(u16*)rom != 0xaa55)
303 u32 len = rom[2] * 512;
304 if (checksum(rom, len) != 0)
306 p = (u8*)(((u32)p + len) / 2048 * 2048);
307 callrom(FARPTR_TO_SEG(rom), FARPTR_TO_OFFSET(rom + 3));
309 // Look at the ROM's PnP Expansion header. Properly, we're supposed
310 // to init all the ROMs and then go back and build an IPL table of
311 // all the bootable devices, but we can get away with one pass.
312 if (rom[0x1a] != '$' || rom[0x1b] != 'P'
313 || rom[0x1c] != 'n' || rom[0x1d] != 'P')
315 // 0x1A is also the offset into the expansion header of...
316 // the Bootstrap Entry Vector, or zero if there is none.
317 u16 entry = *(u16*)&rom[0x1a+0x1a];
320 // Found a device that thinks it can boot the system. Record
321 // its BEV and product name string.
323 if (ebda->ipl.count >= ARRAY_SIZE(ebda->ipl.table))
326 struct ipl_entry_s *ip = &ebda->ipl.table[ebda->ipl.count];
327 ip->type = IPL_TYPE_BEV;
328 ip->vector = (FARPTR_TO_SEG(rom) << 16) | entry;
330 u16 desc = *(u16*)&rom[0x1a+0x10];
332 ip->description = (u32)MAKE_FARPTR(FARPTR_TO_SEG(rom), desc);
341 BX_INFO("Start bios\n");
354 rom_scan(0xc0000, 0xc7800);
356 printf("BIOS - begin\n\n");
358 // clear bss section -- XXX - shouldn't use globals
359 extern char __bss_start[], __bss_end[];
360 memset(__bss_start, 0, __bss_end - __bss_start);
364 floppy_drive_setup();
373 rom_scan(0xc8000, 0xe0000);
375 interactive_bootmenu();
377 // reset the memory (some boot loaders such as syslinux suppose
378 // that the memory is set to zero)
379 memset((void*)0x40000, 0, 0x40000); // XXX - shouldn't use globals
381 // Invoke int 19 to start boot process.
383 memset(&br, 0, sizeof(br));
384 call16_int(0x19, &br);
390 // first reset the DMA controllers
391 outb(0, PORT_DMA1_MASTER_CLEAR);
392 outb(0, PORT_DMA2_MASTER_CLEAR);
394 // then initialize the DMA controllers
395 outb(0xc0, PORT_DMA2_MODE_REG);
396 outb(0x00, PORT_DMA2_MASK_REG);
400 check_restart_status()
402 // Get and then clear CMOS shutdown status.
403 u8 status = inb_cmos(CMOS_RESET_CODE);
404 outb_cmos(0, CMOS_RESET_CODE);
406 if (status == 0x00 || status == 0x09 || status >= 0x0d)
410 if (status != 0x05) {
411 BX_PANIC("Unimplemented shutdown status: %02x\n", status);
415 // XXX - this is supposed to jump without changing any memory -
416 // but the stack has been altered by the time the code gets here.
419 memset(&br, 0, sizeof(br));
420 br.cs = GET_BDA(jump_cs_ip) >> 16;
421 br.ip = GET_BDA(jump_cs_ip);
429 check_restart_status();