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 LGPLv3 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 "disk.h" // floppy_drive_setup
14 #include "memmap.h" // add_e820
15 #include "pic.h" // pic_setup
16 #include "pci.h" // create_pirtable
17 #include "acpi.h" // acpi_bios_init
18 #include "bregs.h" // struct bregs
19 #include "boot.h" // IPL
22 __set_irq(int vector, void *loc)
24 SET_IVT(vector, SEG_BIOS, (u32)loc - BUILD_BIOS_ADDR);
27 #define set_irq(vector, func) do { \
28 extern void func (void); \
29 __set_irq(vector, func); \
35 dprintf(3, "init ivt\n");
37 // Initialize all vectors to the default handler.
40 set_irq(i, entry_iret_official);
42 // Initialize all hw vectors to a default hw handler.
43 for (i=0x08; i<=0x0f; i++)
44 set_irq(i, entry_hwpic1);
45 for (i=0x70; i<=0x77; i++)
46 set_irq(i, entry_hwpic2);
48 // Initialize software handlers.
49 set_irq(0x10, entry_10);
50 set_irq(0x11, entry_11_official);
51 set_irq(0x12, entry_12_official);
52 set_irq(0x13, entry_13_official);
53 set_irq(0x14, entry_14);
54 set_irq(0x15, entry_15);
55 set_irq(0x16, entry_16);
56 set_irq(0x17, entry_17);
57 set_irq(0x18, entry_18);
58 set_irq(0x19, entry_19_official);
59 set_irq(0x1a, entry_1a);
60 set_irq(0x40, entry_40);
62 // set vector 0x79 to zero
63 // this is used by 'gardian angel' protection system
66 __set_irq(0x1E, &diskette_param_table2);
72 dprintf(3, "init bda\n");
74 struct bios_data_area_s *bda = MAKE_FLATPTR(SEG_BDA, 0);
75 memset(bda, 0, sizeof(*bda));
77 int esize = DIV_ROUND_UP(sizeof(struct extended_bios_data_area_s), 1024);
78 SET_BDA(mem_size_kb, 640 - esize);
79 u16 eseg = FLATPTR_TO_SEG((640 - esize) * 1024);
80 SET_BDA(ebda_seg, eseg);
82 struct extended_bios_data_area_s *ebda = get_ebda_ptr();
83 memset(ebda, 0, sizeof(*ebda));
85 SET_IVT(0x41, eseg, offsetof(struct extended_bios_data_area_s, fdpt[0]));
86 SET_IVT(0x46, eseg, offsetof(struct extended_bios_data_area_s, fdpt[1]));
92 dprintf(3, "Find memory size\n");
93 if (CONFIG_COREBOOT) {
96 // On emulators, get memory size from nvram.
97 u32 rs = ((inb_cmos(CMOS_MEM_EXTMEM2_LOW) << 16)
98 | (inb_cmos(CMOS_MEM_EXTMEM2_HIGH) << 24));
100 rs += 16 * 1024 * 1024;
102 rs = (((inb_cmos(CMOS_MEM_EXTMEM_LOW) << 10)
103 | (inb_cmos(CMOS_MEM_EXTMEM_HIGH) << 18))
106 add_e820(0, rs, E820_RAM);
108 // Check for memory over 4Gig
109 u64 high = ((inb_cmos(CMOS_MEM_HIGHMEM_LOW) << 16)
110 | (inb_cmos(CMOS_MEM_HIGHMEM_MID) << 24)
111 | ((u64)inb_cmos(CMOS_MEM_HIGHMEM_HIGH) << 32));
112 RamSizeOver4G = high;
113 add_e820(0x100000000ull, high, E820_RAM);
115 /* reserve 256KB BIOS area at the end of 4 GB */
116 add_e820(0xfffc0000, 256*1024, E820_RESERVED);
119 // Don't declare any memory between 0xa0000 and 0x100000
120 add_e820(0xa0000, 0x50000, E820_HOLE);
122 // Mark known areas as reserved.
123 u16 ebda_seg = get_ebda_seg();
124 add_e820((u32)MAKE_FLATPTR(ebda_seg, 0), GET_EBDA2(ebda_seg, size) * 1024
126 add_e820(BUILD_BIOS_ADDR, BUILD_BIOS_SIZE, E820_RESERVED);
129 // 4 pages before the bios, 3 pages for vmx tss pages, the
130 // other page for EPT real mode pagetable
131 add_e820(0xfffbc000, 4*4096, E820_RESERVED);
133 dprintf(1, "Ram Size=0x%08x\n", RamSize);
137 init_bios_tables(void)
140 // XXX - not supported on coreboot yet.
185 floppy_drive_setup();
191 // 32-bit entry point.
197 debug_serial_setup();
198 dprintf(1, "Start bios\n");
200 // Allow writes to modify bios area (0xf0000)
201 make_bios_writable();
203 // Perform main setup code.
206 // Present the user with a bootup menu.
207 interactive_bootmenu();
209 // Setup bios checksum.
210 BiosChecksum = -checksum((u8*)BUILD_BIOS_ADDR, BUILD_BIOS_SIZE - 1);
212 // Prep for boot process.
213 make_bios_readonly();
215 // Invoke int 19 to start boot process.
216 dprintf(3, "Jump to int19\n");
218 memset(&br, 0, sizeof(br));
219 call16_int(0x19, &br);
222 // Ughh - some older gcc compilers have a bug which causes VISIBLE32
223 // functions to not be exported as a global variable - force _start
224 // to be global here.
225 asm(".global _start");