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 "config.h" // CONFIG_*
10 #include "cmos.h" // CMOS_*
11 #include "util.h" // memset
12 #include "biosvar.h" // struct bios_data_area_s
13 #include "ata.h" // hard_drive_setup
14 #include "disk.h" // floppy_drive_setup
15 #include "memmap.h" // add_e820
16 #include "pic.h" // pic_setup
17 #include "pci.h" // create_pirtable
18 #include "acpi.h" // acpi_bios_init
19 #include "bregs.h" // struct bregs
21 #define bda ((struct bios_data_area_s *)MAKE_FARPTR(SEG_BDA, 0))
22 #define ebda ((struct extended_bios_data_area_s *)MAKE_FARPTR(SEG_EBDA, 0))
25 __set_irq(int vector, void *loc)
27 SET_BDA(ivecs[vector].seg, SEG_BIOS);
28 SET_BDA(ivecs[vector].offset, (u32)loc - BUILD_BIOS_ADDR);
31 #define set_irq(vector, func) do { \
32 extern void func (void); \
33 __set_irq(vector, func); \
39 dprintf(3, "init bda\n");
40 memset(bda, 0, sizeof(*bda));
42 SET_BDA(mem_size_kb, BASE_MEM_IN_K);
44 // Initialize all vectors to a dummy handler.
47 set_irq(i, dummy_iret_handler);
49 // Initialize all hw vectors to a default hw handler.
50 for (i=0x08; i<=0x0f; i++)
51 set_irq(i, entry_hwpic1);
52 for (i=0x70; i<=0x77; i++)
53 set_irq(i, entry_hwpic2);
55 // Initialize software handlers.
56 set_irq(0x10, entry_10);
57 set_irq(0x11, entry_11_official);
58 set_irq(0x12, entry_12_official);
59 set_irq(0x13, entry_13_official);
60 set_irq(0x14, entry_14);
61 set_irq(0x15, entry_15);
62 set_irq(0x16, entry_16);
63 set_irq(0x17, entry_17);
64 set_irq(0x18, entry_18);
65 set_irq(0x19, entry_19_official);
66 set_irq(0x1a, entry_1a);
67 set_irq(0x1c, entry_1c);
68 set_irq(0x40, entry_40);
70 // set vector 0x79 to zero
71 // this is used by 'gardian angel' protection system
72 SET_BDA(ivecs[0x79].seg, 0);
73 SET_BDA(ivecs[0x79].offset, 0);
75 __set_irq(0x1E, &diskette_param_table2);
81 memset(ebda, 0, sizeof(*ebda));
82 ebda->size = EBDA_SIZE;
83 SET_BDA(ebda_seg, SEG_EBDA);
84 SET_BDA(ivecs[0x41].seg, SEG_EBDA);
85 SET_BDA(ivecs[0x41].offset
86 , offsetof(struct extended_bios_data_area_s, fdpt[0]));
87 SET_BDA(ivecs[0x46].seg, SEG_EBDA);
88 SET_BDA(ivecs[0x41].offset
89 , offsetof(struct extended_bios_data_area_s, fdpt[1]));
95 dprintf(3, "Find memory size\n");
96 if (CONFIG_COREBOOT) {
99 // On emulators, get memory size from nvram.
100 u32 rs = ((inb_cmos(CMOS_MEM_EXTMEM2_LOW) << 16)
101 | (inb_cmos(CMOS_MEM_EXTMEM2_HIGH) << 24));
103 rs += 16 * 1024 * 1024;
105 rs = (((inb_cmos(CMOS_MEM_EXTMEM_LOW) << 10)
106 | (inb_cmos(CMOS_MEM_EXTMEM_HIGH) << 18))
108 SET_EBDA(ram_size, rs);
109 add_e820(0, rs, E820_RAM);
111 // Check for memory over 4Gig
112 u64 high = ((inb_cmos(CMOS_MEM_HIGHMEM_LOW) << 16)
113 | (inb_cmos(CMOS_MEM_HIGHMEM_MID) << 24)
114 | ((u64)inb_cmos(CMOS_MEM_HIGHMEM_HIGH) << 32));
115 SET_EBDA(ram_size_over4G, high);
116 add_e820(0x100000000ull, high, E820_RAM);
118 /* reserve 256KB BIOS area at the end of 4 GB */
119 add_e820(0xfffc0000, 256*1024, E820_RESERVED);
122 // Don't declare any memory between 0xa0000 and 0x100000
123 add_e820(0xa0000, 0x50000, E820_HOLE);
125 // Mark known areas as reserved.
126 add_e820((u32)MAKE_FARPTR(SEG_EBDA, 0), EBDA_SIZE * 1024, E820_RESERVED);
127 add_e820(BUILD_BIOS_ADDR, BUILD_BIOS_SIZE, E820_RESERVED);
129 dprintf(1, "ram_size=0x%08x\n", GET_EBDA(ram_size));
133 init_bios_tables(void)
136 // XXX - not supported on coreboot yet.
153 dprintf(3, "init boot device ordering\n");
156 struct ipl_entry_s *ip = &ebda->ipl.table[0];
157 ip->type = IPL_TYPE_FLOPPY;
161 ip->type = IPL_TYPE_HARDDISK;
165 if (CONFIG_CDROM_BOOT) {
166 ip->type = IPL_TYPE_CDROM;
170 ebda->ipl.count = ip - ebda->ipl.table;
171 ebda->ipl.sequence = 0xffff;
172 if (CONFIG_COREBOOT) {
173 // XXX - hardcode defaults for coreboot.
174 ebda->ipl.bootorder = 0x00000231;
175 ebda->ipl.checkfloppysig = 1;
177 // On emulators, get boot order from nvram.
178 ebda->ipl.bootorder = (inb_cmos(CMOS_BIOS_BOOTFLAG2)
179 | ((inb_cmos(CMOS_BIOS_BOOTFLAG1) & 0xf0) << 4));
180 if (!(inb_cmos(CMOS_BIOS_BOOTFLAG1) & 1))
181 ebda->ipl.checkfloppysig = 1;
214 floppy_drive_setup();
222 // 32-bit entry point.
228 debug_serial_setup();
229 dprintf(1, "Start bios\n");
231 // Allow writes to modify bios area (0xf0000)
232 make_bios_writable();
234 // Perform main setup code.
237 // Present the user with a bootup menu.
238 interactive_bootmenu();
240 // Setup bios checksum.
241 extern char bios_checksum;
242 bios_checksum = -checksum((u8*)BUILD_BIOS_ADDR, BUILD_BIOS_SIZE - 1);
244 // Prep for boot process.
245 make_bios_readonly();
247 // Invoke int 19 to start boot process.
248 dprintf(3, "Jump to int19\n");
250 memset(&br, 0, sizeof(br));
251 call16_int(0x19, &br);
254 // Ughh - some older gcc compilers have a bug which causes VISIBLE32
255 // functions to not be exported as a global variable - force _start
256 // to be global here.
257 asm(".global _start");