1 // 32bit code to Power On Self Test (POST) a machine.
3 // Copyright (C) 2008,2009 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 "ata.h" // ata_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
20 #include "mptable.h" // mptable_init
21 #include "boot.h" // IPL
22 #include "usb.h" // usb_setup
26 __set_irq(int vector, void *loc)
28 SET_IVT(vector, SEGOFF(SEG_BIOS, (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 ivt\n");
41 // Initialize all vectors to the default handler.
44 set_irq(i, entry_iret_official);
46 // Initialize all hw vectors to a default hw handler.
47 for (i=0x08; i<=0x0f; i++)
48 set_irq(i, entry_hwpic1);
49 for (i=0x70; i<=0x77; i++)
50 set_irq(i, entry_hwpic2);
52 // Initialize software handlers.
53 set_irq(0x02, entry_02);
54 set_irq(0x10, entry_10);
55 set_irq(0x11, entry_11);
56 set_irq(0x12, entry_12);
57 set_irq(0x13, entry_13_official);
58 set_irq(0x14, entry_14);
59 set_irq(0x15, entry_15);
60 set_irq(0x16, entry_16);
61 set_irq(0x17, entry_17);
62 set_irq(0x18, entry_18);
63 set_irq(0x19, entry_19_official);
64 set_irq(0x1a, entry_1a);
65 set_irq(0x40, entry_40);
67 // set vector 0x79 to zero
68 // this is used by 'gardian angel' protection system
69 SET_IVT(0x79, SEGOFF(0, 0));
71 __set_irq(0x1E, &diskette_param_table2);
77 dprintf(3, "init bda\n");
79 struct bios_data_area_s *bda = MAKE_FLATPTR(SEG_BDA, 0);
80 memset(bda, 0, sizeof(*bda));
82 int esize = EBDA_SIZE_START;
83 SET_BDA(mem_size_kb, BUILD_LOWRAM_END/1024 - esize);
84 u16 eseg = EBDA_SEGMENT_START;
85 SET_BDA(ebda_seg, eseg);
88 struct extended_bios_data_area_s *ebda = get_ebda_ptr();
89 memset(ebda, 0, sizeof(*ebda));
96 dprintf(3, "Find memory size\n");
97 if (CONFIG_COREBOOT) {
100 // On emulators, get memory size from nvram.
101 u32 rs = ((inb_cmos(CMOS_MEM_EXTMEM2_LOW) << 16)
102 | (inb_cmos(CMOS_MEM_EXTMEM2_HIGH) << 24));
104 rs += 16 * 1024 * 1024;
106 rs = (((inb_cmos(CMOS_MEM_EXTMEM_LOW) << 10)
107 | (inb_cmos(CMOS_MEM_EXTMEM_HIGH) << 18))
110 add_e820(0, rs, E820_RAM);
112 // Check for memory over 4Gig
113 u64 high = ((inb_cmos(CMOS_MEM_HIGHMEM_LOW) << 16)
114 | (inb_cmos(CMOS_MEM_HIGHMEM_MID) << 24)
115 | ((u64)inb_cmos(CMOS_MEM_HIGHMEM_HIGH) << 32));
116 RamSizeOver4G = high;
117 add_e820(0x100000000ull, high, E820_RAM);
119 /* reserve 256KB BIOS area at the end of 4 GB */
120 add_e820(0xfffc0000, 256*1024, E820_RESERVED);
123 // Don't declare any memory between 0xa0000 and 0x100000
124 add_e820(BUILD_LOWRAM_END, BUILD_BIOS_ADDR-BUILD_LOWRAM_END, E820_HOLE);
126 // Mark known areas as reserved.
127 u16 ebda_seg = get_ebda_seg();
128 add_e820((u32)MAKE_FLATPTR(ebda_seg, 0), GET_EBDA2(ebda_seg, size) * 1024
130 add_e820(BUILD_BIOS_ADDR, BUILD_BIOS_SIZE, E820_RESERVED);
133 // 4 pages before the bios, 3 pages for vmx tss pages, the
134 // other page for EPT real mode pagetable
135 add_e820(0xfffbc000, 4*4096, E820_RESERVED);
137 dprintf(1, "Ram Size=0x%08x\n", RamSize);
141 init_bios_tables(void)
143 if (CONFIG_COREBOOT) {
144 coreboot_copy_biostable();
188 qemu_cfg_port_probe();
210 // 32-bit entry point.
216 debug_serial_setup();
217 dprintf(1, "Start bios (version %s)\n", VERSION);
219 // Allow writes to modify bios area (0xf0000)
220 make_bios_writable();
222 // Perform main setup code.
225 // Setup bios checksum.
226 BiosChecksum -= checksum((u8*)BUILD_BIOS_ADDR, BUILD_BIOS_SIZE);
228 // Write protect bios memory.
229 make_bios_readonly();
231 // Invoke int 19 to start boot process.
232 dprintf(3, "Jump to int19\n");
234 memset(&br, 0, sizeof(br));
236 call16_int(0x19, &br);