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
17 #define bda ((struct bios_data_area_s *)0)
18 #define ebda ((struct extended_bios_data_area_s *)(EBDA_SEG<<4))
23 memset(bda, 0, sizeof(*bda));
26 for (i=0; i<256; i++) {
27 SET_BDA(ivecs[i].seg, SEG_BIOS);
28 SET_BDA(ivecs[i].offset, OFFSET_dummy_iret_handler);
31 SET_BDA(mem_size_kb, BASE_MEM_IN_K);
33 // mov CMOS Equipment Byte to BDA Equipment Word
34 SET_BDA(equipment_list_flags, inb_cmos(CMOS_EQUIPMENT_INFO));
40 // set vector 0x79 to zero
41 // this is used by 'gardian angel' protection system
42 SET_BDA(ivecs[0x79].seg, 0);
43 SET_BDA(ivecs[0x79].offset, 0);
45 SET_BDA(ivecs[0x40].offset, OFFSET_entry_40);
46 SET_BDA(ivecs[0x0e].offset, OFFSET_entry_0e);
47 SET_BDA(ivecs[0x13].offset, OFFSET_entry_13);
48 SET_BDA(ivecs[0x76].offset, OFFSET_entry_76);
49 SET_BDA(ivecs[0x17].offset, OFFSET_entry_17);
50 SET_BDA(ivecs[0x18].offset, OFFSET_entry_18);
51 SET_BDA(ivecs[0x19].offset, OFFSET_entry_19);
52 SET_BDA(ivecs[0x1c].offset, OFFSET_entry_1c);
53 SET_BDA(ivecs[0x12].offset, OFFSET_entry_12);
54 SET_BDA(ivecs[0x11].offset, OFFSET_entry_11);
55 SET_BDA(ivecs[0x15].offset, OFFSET_entry_15);
56 SET_BDA(ivecs[0x08].offset, OFFSET_entry_08);
57 SET_BDA(ivecs[0x09].offset, OFFSET_entry_09);
58 SET_BDA(ivecs[0x16].offset, OFFSET_entry_16);
59 SET_BDA(ivecs[0x14].offset, OFFSET_entry_14);
60 SET_BDA(ivecs[0x1a].offset, OFFSET_entry_1a);
61 SET_BDA(ivecs[0x70].offset, OFFSET_entry_70);
62 SET_BDA(ivecs[0x74].offset, OFFSET_entry_74);
63 SET_BDA(ivecs[0x75].offset, OFFSET_entry_75);
64 SET_BDA(ivecs[0x10].offset, OFFSET_entry_10);
70 memset(ebda, 0, sizeof(*ebda));
71 ebda->size = EBDA_SIZE;
72 SET_BDA(ebda_seg, EBDA_SEG);
73 SET_BDA(ivecs[0x41].seg, EBDA_SEG);
74 SET_BDA(ivecs[0x41].offset
75 , offsetof(struct extended_bios_data_area_s, fdpt0));
76 SET_BDA(ivecs[0x46].seg, EBDA_SEG);
77 SET_BDA(ivecs[0x41].offset
78 , offsetof(struct extended_bios_data_area_s, fdpt1));
84 // timer0: binary count, 16bit count, mode 2
85 outb(0x34, PORT_PIT_MODE);
86 // maximum count of 0000H = 18.2Hz
87 outb(0x0, PORT_PIT_COUNTER0);
88 outb(0x0, PORT_PIT_COUNTER0);
92 detect_parport(u16 port, u8 timeout, u8 count)
95 outb(inb(port+2) & 0xdf, port+2);
98 if (inb(port) != 0xaa)
101 SET_BDA(port_lpt[count], port);
102 SET_BDA(lpt_timeout[count], timeout);
110 count += detect_parport(0x378, 0x14, count);
111 count += detect_parport(0x278, 0x14, count);
113 // Equipment word bits 14..15 determing # parallel ports
114 u16 eqb = GET_BDA(equipment_list_flags);
115 SET_BDA(equipment_list_flags, (eqb & 0x3fff) | (count << 14));
119 detect_serial(u16 port, u8 timeout, u8 count)
122 if (inb(port+1) != 0x02)
124 if (inb(port+2) != 0x02)
127 SET_BDA(port_com[count], port);
128 SET_BDA(com_timeout[count], timeout);
136 count += detect_serial(0x3f8, 0x0a, count);
137 count += detect_serial(0x2f8, 0x0a, count);
138 count += detect_serial(0x3e8, 0x0a, count);
139 count += detect_serial(0x2e8, 0x0a, count);
141 // Equipment word bits 9..11 determing # serial ports
142 u16 eqb = GET_BDA(equipment_list_flags);
143 SET_BDA(equipment_list_flags, (eqb & 0xf1ff) | (count << 9));
149 return (val & 0xf) + ((val >> 4) * 10);
155 u32 seconds = bcd2bin(inb_cmos(CMOS_RTC_SECONDS));
156 u32 ticks = (seconds * 18206507) / 1000000;
157 u32 minutes = bcd2bin(inb_cmos(CMOS_RTC_MINUTES));
158 ticks += (minutes * 10923904) / 10000;
159 u32 hours = bcd2bin(inb_cmos(CMOS_RTC_HOURS));
160 ticks += (hours * 65543427) / 1000;
161 SET_BDA(timer_counter, ticks);
162 SET_BDA(timer_rollover, 0);
168 outb(0x11, PORT_PIC1);
169 outb(0x11, PORT_PIC2);
170 outb(0x08, PORT_PIC1_DATA);
171 outb(0x70, PORT_PIC2_DATA);
172 outb(0x04, PORT_PIC1_DATA);
173 outb(0x02, PORT_PIC2_DATA);
174 outb(0x01, PORT_PIC1_DATA);
175 outb(0x01, PORT_PIC2_DATA);
176 outb(0xb8, PORT_PIC1_DATA);
177 if (CONFIG_PS2_MOUSE)
178 outb(0x8f, PORT_PIC2_DATA);
180 outb(0x9f, PORT_PIC2_DATA);
186 u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
192 SET_BDA(floppy_harddisk_info, out);
193 outb(0x02, PORT_DMA1_MASK_REG);
195 SET_BDA(ivecs[0x1E].offset, OFFSET_diskette_param_table2);
201 // hdidmap and cdidmap init.
203 for (device=0; device < CONFIG_MAX_ATA_DEVICES; device++) {
204 ebda->ata.idmap[0][device] = CONFIG_MAX_ATA_DEVICES;
205 ebda->ata.idmap[1][device] = CONFIG_MAX_ATA_DEVICES;
210 fill_hdinfo(struct fdpt_s *info, u8 typecmos, u8 basecmos)
212 u8 type = inb_cmos(typecmos);
217 info->precompensation = (inb_cmos(basecmos+4) << 8) | inb_cmos(basecmos+3);
218 info->drive_control_byte = inb_cmos(basecmos+5);
219 info->landing_zone = (inb_cmos(basecmos+7) << 8) | inb_cmos(basecmos+6);
220 u16 cyl = (inb_cmos(basecmos+1) << 8) | inb_cmos(basecmos+0);
221 u8 heads = inb_cmos(basecmos+2);
222 u8 sectors = inb_cmos(basecmos+8);
224 // no logical CHS mapping used, just physical CHS
225 // use Standard Fixed Disk Parameter Table (FDPT)
226 info->cylinders = cyl;
228 info->sectors = sectors;
232 // complies with Phoenix style Translated Fixed Disk Parameter
234 info->phys_cylinders = cyl;
235 info->phys_heads = heads;
236 info->phys_sectors = sectors;
237 info->sectors = sectors;
238 info->a0h_signature = 0xa0;
242 } else if (cyl > 4096) {
245 } else if (cyl > 2048) {
249 info->cylinders = cyl;
251 info->checksum = -checksum((u8*)info, sizeof(*info)-1);
257 outb(0x0a, 0x03f6); // 0000 1010 = reserved, disable IRQ 14
258 SET_BDA(disk_count, 1);
259 SET_BDA(disk_control_byte, 0xc0);
261 // move disk geometry data from CMOS to EBDA disk parameter table(s)
262 u8 diskinfo = inb_cmos(CMOS_DISK_DATA);
263 if ((diskinfo & 0xf0) == 0xf0)
264 // Fill EBDA table for hard disk 0.
265 fill_hdinfo(&ebda->fdpt0, CMOS_DISK_DRIVE1_TYPE, CMOS_DISK_DRIVE1_CYL);
266 if ((diskinfo & 0x0f) == 0x0f)
267 // XXX - bochs halts on any other type
268 // Fill EBDA table for hard disk 1.
269 fill_hdinfo(&ebda->fdpt0, CMOS_DISK_DRIVE2_TYPE, CMOS_DISK_DRIVE2_CYL);
277 struct ipl_entry_s *ip = &ebda->ipl.table[0];
278 ip->type = IPL_TYPE_FLOPPY;
282 ip->type = IPL_TYPE_HARDDISK;
286 if (CONFIG_CDROM_BOOT) {
287 ip->type = IPL_TYPE_CDROM;
291 ebda->ipl.count = ip - ebda->ipl.table;
292 ebda->ipl.sequence = 0xffff;
296 callrom(u16 seg, u16 offset)
299 memset(&br, 0, sizeof(br));
301 br.di = OFFSET_pnp_string + 1; // starts 1 past for alignment
308 rom_scan(u32 start, u32 end)
311 for (; p <= (u8*)end; p += 2048) {
313 if (*(u16*)rom != 0xaa55)
315 u32 len = rom[2] * 512;
316 if (checksum(rom, len) != 0)
318 p = (u8*)(((u32)p + len) / 2048 * 2048);
319 callrom(FARPTR_TO_SEG(rom), FARPTR_TO_OFFSET(rom + 3));
321 // Look at the ROM's PnP Expansion header. Properly, we're supposed
322 // to init all the ROMs and then go back and build an IPL table of
323 // all the bootable devices, but we can get away with one pass.
324 if (rom[0x1a] != '$' || rom[0x1b] != 'P'
325 || rom[0x1c] != 'n' || rom[0x1d] != 'P')
327 // 0x1A is also the offset into the expansion header of...
328 // the Bootstrap Entry Vector, or zero if there is none.
329 u16 entry = *(u16*)&rom[0x1a+0x1a];
332 // Found a device that thinks it can boot the system. Record
333 // its BEV and product name string.
335 if (ebda->ipl.count >= ARRAY_SIZE(ebda->ipl.table))
338 struct ipl_entry_s *ip = &ebda->ipl.table[ebda->ipl.count];
339 ip->type = IPL_TYPE_BEV;
340 ip->vector = (FARPTR_TO_SEG(rom) << 16) | entry;
342 u16 desc = *(u16*)&rom[0x1a+0x10];
344 ip->description = (FARPTR_TO_SEG(rom) << 16) | desc;
353 BX_INFO("Start bios\n");
366 rom_scan(0xc0000, 0xc7800);
368 printf("BIOS - begin\n\n");
370 // clear bss section -- XXX - shouldn't use globals
371 extern char __bss_start[], __bss_end[];
372 memset(__bss_start, 0, __bss_end - __bss_start);
387 rom_scan(0xc8000, 0xe0000);
389 // reset the memory (some boot loaders such as syslinux suppose
390 // that the memory is set to zero)
391 memset((void*)0x40000, 0, 0x40000); // XXX - shouldn't use globals
393 // Invoke int 19 to start boot process.
395 memset(&br, 0, sizeof(br));
396 call16_int(0x19, &br);
402 // first reset the DMA controllers
403 outb(0, PORT_DMA1_MASTER_CLEAR);
404 outb(0, PORT_DMA2_MASTER_CLEAR);
406 // then initialize the DMA controllers
407 outb(0xc0, PORT_DMA2_MODE_REG);
408 outb(0x00, PORT_DMA2_MASK_REG);
412 check_restart_status()
414 // Get and then clear CMOS shutdown status.
415 u8 status = inb_cmos(CMOS_RESET_CODE);
416 outb_cmos(0, CMOS_RESET_CODE);
418 if (status == 0x00 || status == 0x09 || status >= 0x0d)
422 if (status != 0x05) {
423 BX_PANIC("Unimplemented shutdown status: %02x\n", status);
427 // XXX - this is supposed to jump without changing any memory -
428 // but the stack has been altered by the time the code gets here.
431 memset(&br, 0, sizeof(br));
432 br.cs = GET_BDA(jump_cs_ip) >> 16;
433 br.ip = GET_BDA(jump_cs_ip);
441 check_restart_status();