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" // hard_drive_setup
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));
37 // set vector 0x79 to zero
38 // this is used by 'gardian angel' protection system
39 SET_BDA(ivecs[0x79].seg, 0);
40 SET_BDA(ivecs[0x79].offset, 0);
42 SET_BDA(ivecs[0x40].offset, OFFSET_entry_40);
43 SET_BDA(ivecs[0x0e].offset, OFFSET_entry_0e);
44 SET_BDA(ivecs[0x13].offset, OFFSET_entry_13);
45 SET_BDA(ivecs[0x76].offset, OFFSET_entry_76);
46 SET_BDA(ivecs[0x17].offset, OFFSET_entry_17);
47 SET_BDA(ivecs[0x18].offset, OFFSET_entry_18);
48 SET_BDA(ivecs[0x19].offset, OFFSET_entry_19);
49 SET_BDA(ivecs[0x1c].offset, OFFSET_entry_1c);
50 SET_BDA(ivecs[0x12].offset, OFFSET_entry_12);
51 SET_BDA(ivecs[0x11].offset, OFFSET_entry_11);
52 SET_BDA(ivecs[0x15].offset, OFFSET_entry_15);
53 SET_BDA(ivecs[0x08].offset, OFFSET_entry_08);
54 SET_BDA(ivecs[0x09].offset, OFFSET_entry_09);
55 SET_BDA(ivecs[0x16].offset, OFFSET_entry_16);
56 SET_BDA(ivecs[0x14].offset, OFFSET_entry_14);
57 SET_BDA(ivecs[0x1a].offset, OFFSET_entry_1a);
58 SET_BDA(ivecs[0x70].offset, OFFSET_entry_70);
59 SET_BDA(ivecs[0x74].offset, OFFSET_entry_74);
60 SET_BDA(ivecs[0x75].offset, OFFSET_entry_75);
61 SET_BDA(ivecs[0x10].offset, OFFSET_entry_10);
63 SET_BDA(ivecs[0x1E].offset, OFFSET_diskette_param_table2);
69 memset(ebda, 0, sizeof(*ebda));
70 ebda->size = EBDA_SIZE;
71 SET_BDA(ebda_seg, SEG_EBDA);
72 SET_BDA(ivecs[0x41].seg, SEG_EBDA);
73 SET_BDA(ivecs[0x41].offset
74 , offsetof(struct extended_bios_data_area_s, fdpt[0]));
75 SET_BDA(ivecs[0x46].seg, SEG_EBDA);
76 SET_BDA(ivecs[0x41].offset
77 , offsetof(struct extended_bios_data_area_s, fdpt[1]));
83 outb(0x11, PORT_PIC1);
84 outb(0x11, PORT_PIC2);
85 outb(0x08, PORT_PIC1_DATA);
86 outb(0x70, PORT_PIC2_DATA);
87 outb(0x04, PORT_PIC1_DATA);
88 outb(0x02, PORT_PIC2_DATA);
89 outb(0x01, PORT_PIC1_DATA);
90 outb(0x01, PORT_PIC2_DATA);
91 outb(0xb8, PORT_PIC1_DATA);
93 outb(0x8f, PORT_PIC2_DATA);
95 outb(0x9f, PORT_PIC2_DATA);
102 struct ipl_entry_s *ip = &ebda->ipl.table[0];
103 ip->type = IPL_TYPE_FLOPPY;
107 ip->type = IPL_TYPE_HARDDISK;
111 if (CONFIG_CDROM_BOOT) {
112 ip->type = IPL_TYPE_CDROM;
116 ebda->ipl.count = ip - ebda->ipl.table;
117 ebda->ipl.sequence = 0xffff;
118 ebda->ipl.bootfirst = 0xffff;
122 callrom(u16 seg, u16 offset)
125 memset(&br, 0, sizeof(br));
127 br.di = OFFSET_pnp_string + 1; // starts 1 past for alignment
134 rom_scan(u32 start, u32 end)
137 for (; p <= (u8*)end; p += 2048) {
139 if (*(u16*)rom != 0xaa55)
141 u32 len = rom[2] * 512;
142 if (checksum(rom, len) != 0)
144 p = (u8*)(((u32)p + len) / 2048 * 2048);
145 callrom(FARPTR_TO_SEG(rom), FARPTR_TO_OFFSET(rom + 3));
147 // Look at the ROM's PnP Expansion header. Properly, we're supposed
148 // to init all the ROMs and then go back and build an IPL table of
149 // all the bootable devices, but we can get away with one pass.
150 if (rom[0x1a] != '$' || rom[0x1b] != 'P'
151 || rom[0x1c] != 'n' || rom[0x1d] != 'P')
153 // 0x1A is also the offset into the expansion header of...
154 // the Bootstrap Entry Vector, or zero if there is none.
155 u16 entry = *(u16*)&rom[0x1a+0x1a];
158 // Found a device that thinks it can boot the system. Record
159 // its BEV and product name string.
161 if (ebda->ipl.count >= ARRAY_SIZE(ebda->ipl.table))
164 struct ipl_entry_s *ip = &ebda->ipl.table[ebda->ipl.count];
165 ip->type = IPL_TYPE_BEV;
166 ip->vector = (FARPTR_TO_SEG(rom) << 16) | entry;
168 u16 desc = *(u16*)&rom[0x1a+0x10];
170 ip->description = (u32)MAKE_FARPTR(FARPTR_TO_SEG(rom), desc);
179 BX_INFO("Start bios\n");
190 rom_scan(0xc0000, 0xc7800);
192 printf("BIOS - begin\n\n");
194 // clear bss section -- XXX - shouldn't use globals
195 extern char __bss_start[], __bss_end[];
196 memset(__bss_start, 0, __bss_end - __bss_start);
200 floppy_drive_setup();
205 rom_scan(0xc8000, 0xe0000);
207 interactive_bootmenu();
209 // reset the memory (some boot loaders such as syslinux suppose
210 // that the memory is set to zero)
211 memset((void*)0x40000, 0, 0x40000); // XXX - shouldn't use globals
213 // Invoke int 19 to start boot process.
215 memset(&br, 0, sizeof(br));
216 call16_int(0x19, &br);
222 // first reset the DMA controllers
223 outb(0, PORT_DMA1_MASTER_CLEAR);
224 outb(0, PORT_DMA2_MASTER_CLEAR);
226 // then initialize the DMA controllers
227 outb(0xc0, PORT_DMA2_MODE_REG);
228 outb(0x00, PORT_DMA2_MASK_REG);
232 check_restart_status()
234 // Get and then clear CMOS shutdown status.
235 u8 status = inb_cmos(CMOS_RESET_CODE);
236 outb_cmos(0, CMOS_RESET_CODE);
238 if (status == 0x00 || status == 0x09 || status >= 0x0d)
242 if (status != 0x05) {
243 BX_PANIC("Unimplemented shutdown status: %02x\n", status);
247 // XXX - this is supposed to jump without changing any memory -
248 // but the stack has been altered by the time the code gets here.
251 memset(&br, 0, sizeof(br));
252 br.cs = GET_BDA(jump_cs_ip) >> 16;
253 br.ip = GET_BDA(jump_cs_ip);
261 check_restart_status();