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
25 __set_irq(int vector, void *loc)
27 SET_IVT(vector, SEGOFF(SEG_BIOS, (u32)loc - BUILD_BIOS_ADDR));
30 #define set_irq(vector, func) do { \
31 extern void func (void); \
32 __set_irq(vector, func); \
38 dprintf(3, "init ivt\n");
40 // Initialize all vectors to the default handler.
43 set_irq(i, entry_iret_official);
45 // Initialize all hw vectors to a default hw handler.
46 for (i=0x08; i<=0x0f; i++)
47 set_irq(i, entry_hwpic1);
48 for (i=0x70; i<=0x77; i++)
49 set_irq(i, entry_hwpic2);
51 // Initialize software handlers.
52 set_irq(0x02, entry_02);
53 set_irq(0x10, entry_10);
54 set_irq(0x11, entry_11);
55 set_irq(0x12, entry_12);
56 set_irq(0x13, entry_13_official);
57 set_irq(0x14, entry_14);
58 set_irq(0x15, entry_15);
59 set_irq(0x16, entry_16);
60 set_irq(0x17, entry_17);
61 set_irq(0x18, entry_18);
62 set_irq(0x19, entry_19_official);
63 set_irq(0x1a, entry_1a);
64 set_irq(0x40, entry_40);
66 // set vector 0x79 to zero
67 // this is used by 'gardian angel' protection system
68 SET_IVT(0x79, SEGOFF(0, 0));
70 __set_irq(0x1E, &diskette_param_table2);
76 dprintf(3, "init bda\n");
78 struct bios_data_area_s *bda = MAKE_FLATPTR(SEG_BDA, 0);
79 memset(bda, 0, sizeof(*bda));
81 int esize = EBDA_SIZE_START;
82 SET_BDA(mem_size_kb, BUILD_LOWRAM_END/1024 - esize);
83 u16 eseg = EBDA_SEGMENT_START;
84 SET_BDA(ebda_seg, eseg);
87 struct extended_bios_data_area_s *ebda = get_ebda_ptr();
88 memset(ebda, 0, sizeof(*ebda));
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))
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 RamSizeOver4G = 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(BUILD_LOWRAM_END, BUILD_BIOS_ADDR-BUILD_LOWRAM_END, E820_HOLE);
125 // Mark known areas as reserved.
126 u16 ebda_seg = get_ebda_seg();
127 add_e820((u32)MAKE_FLATPTR(ebda_seg, 0), GET_EBDA2(ebda_seg, size) * 1024
129 add_e820(BUILD_BIOS_ADDR, BUILD_BIOS_SIZE, E820_RESERVED);
132 // 4 pages before the bios, 3 pages for vmx tss pages, the
133 // other page for EPT real mode pagetable
134 add_e820(0xfffbc000, 4*4096, E820_RESERVED);
136 dprintf(1, "Ram Size=0x%08x\n", RamSize);
140 init_bios_tables(void)
142 if (CONFIG_COREBOOT) {
143 coreboot_copy_biostable();
207 // 32-bit entry point.
213 debug_serial_setup();
214 dprintf(1, "Start bios (version %s)\n", VERSION);
216 // Allow writes to modify bios area (0xf0000)
217 make_bios_writable();
219 // Perform main setup code.
222 // Setup bios checksum.
223 BiosChecksum -= checksum((u8*)BUILD_BIOS_ADDR, BUILD_BIOS_SIZE);
225 // Write protect bios memory.
226 make_bios_readonly();
228 // Invoke int 19 to start boot process.
229 dprintf(3, "Jump to int19\n");
231 memset(&br, 0, sizeof(br));
233 call16_int(0x19, &br);