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 "mptable.h" // mptable_init
20 #include "boot.h" // IPL
23 __set_irq(int vector, void *loc)
25 SET_IVT(vector, SEG_BIOS, (u32)loc - BUILD_BIOS_ADDR);
28 #define set_irq(vector, func) do { \
29 extern void func (void); \
30 __set_irq(vector, func); \
36 dprintf(3, "init ivt\n");
38 // Initialize all vectors to the default handler.
41 set_irq(i, entry_iret_official);
43 // Initialize all hw vectors to a default hw handler.
44 for (i=0x08; i<=0x0f; i++)
45 set_irq(i, entry_hwpic1);
46 for (i=0x70; i<=0x77; i++)
47 set_irq(i, entry_hwpic2);
49 // Initialize software handlers.
50 set_irq(0x10, entry_10);
51 set_irq(0x11, entry_11_official);
52 set_irq(0x12, entry_12_official);
53 set_irq(0x13, entry_13_official);
54 set_irq(0x14, entry_14);
55 set_irq(0x15, entry_15);
56 set_irq(0x16, entry_16);
57 set_irq(0x17, entry_17);
58 set_irq(0x18, entry_18);
59 set_irq(0x19, entry_19_official);
60 set_irq(0x1a, entry_1a);
61 set_irq(0x40, entry_40);
63 // set vector 0x79 to zero
64 // this is used by 'gardian angel' protection system
67 __set_irq(0x1E, &diskette_param_table2);
73 dprintf(3, "init bda\n");
75 struct bios_data_area_s *bda = MAKE_FLATPTR(SEG_BDA, 0);
76 memset(bda, 0, sizeof(*bda));
78 int esize = DIV_ROUND_UP(sizeof(struct extended_bios_data_area_s), 1024);
79 SET_BDA(mem_size_kb, 640 - esize);
80 u16 eseg = FLATPTR_TO_SEG((640 - esize) * 1024);
81 SET_BDA(ebda_seg, eseg);
83 struct extended_bios_data_area_s *ebda = get_ebda_ptr();
84 memset(ebda, 0, sizeof(*ebda));
86 SET_IVT(0x41, eseg, offsetof(struct extended_bios_data_area_s, fdpt[0]));
87 SET_IVT(0x46, eseg, offsetof(struct extended_bios_data_area_s, fdpt[1]));
93 dprintf(3, "Find memory size\n");
94 if (CONFIG_COREBOOT) {
97 // On emulators, get memory size from nvram.
98 u32 rs = ((inb_cmos(CMOS_MEM_EXTMEM2_LOW) << 16)
99 | (inb_cmos(CMOS_MEM_EXTMEM2_HIGH) << 24));
101 rs += 16 * 1024 * 1024;
103 rs = (((inb_cmos(CMOS_MEM_EXTMEM_LOW) << 10)
104 | (inb_cmos(CMOS_MEM_EXTMEM_HIGH) << 18))
107 add_e820(0, rs, E820_RAM);
109 // Check for memory over 4Gig
110 u64 high = ((inb_cmos(CMOS_MEM_HIGHMEM_LOW) << 16)
111 | (inb_cmos(CMOS_MEM_HIGHMEM_MID) << 24)
112 | ((u64)inb_cmos(CMOS_MEM_HIGHMEM_HIGH) << 32));
113 RamSizeOver4G = high;
114 add_e820(0x100000000ull, high, E820_RAM);
116 /* reserve 256KB BIOS area at the end of 4 GB */
117 add_e820(0xfffc0000, 256*1024, E820_RESERVED);
120 // Don't declare any memory between 0xa0000 and 0x100000
121 add_e820(0xa0000, 0x50000, E820_HOLE);
123 // Mark known areas as reserved.
124 u16 ebda_seg = get_ebda_seg();
125 add_e820((u32)MAKE_FLATPTR(ebda_seg, 0), GET_EBDA2(ebda_seg, size) * 1024
127 add_e820(BUILD_BIOS_ADDR, BUILD_BIOS_SIZE, E820_RESERVED);
130 // 4 pages before the bios, 3 pages for vmx tss pages, the
131 // other page for EPT real mode pagetable
132 add_e820(0xfffbc000, 4*4096, E820_RESERVED);
134 dprintf(1, "Ram Size=0x%08x\n", RamSize);
138 init_bios_tables(void)
141 // XXX - not supported on coreboot yet.
186 floppy_drive_setup();
192 // 32-bit entry point.
198 debug_serial_setup();
199 dprintf(1, "Start bios\n");
201 // Allow writes to modify bios area (0xf0000)
202 make_bios_writable();
204 // Perform main setup code.
210 // Setup bios checksum.
211 BiosChecksum = -checksum((u8*)BUILD_BIOS_ADDR, BUILD_BIOS_SIZE - 1);
213 // Prep for boot process.
214 make_bios_readonly();
216 // Invoke int 19 to start boot process.
217 dprintf(3, "Jump to int19\n");
219 memset(&br, 0, sizeof(br));
220 call16_int(0x19, &br);
223 // Ughh - some older gcc compilers have a bug which causes VISIBLE32
224 // functions to not be exported as a global variable - force _start
225 // to be global here.
226 asm(".global _start");