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 "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(0x02, entry_02);
51 set_irq(0x10, entry_10);
52 set_irq(0x11, entry_11);
53 set_irq(0x12, entry_12);
54 set_irq(0x13, entry_13_official);
55 set_irq(0x14, entry_14);
56 set_irq(0x15, entry_15);
57 set_irq(0x16, entry_16);
58 set_irq(0x17, entry_17);
59 set_irq(0x18, entry_18);
60 set_irq(0x19, entry_19_official);
61 set_irq(0x1a, entry_1a);
62 set_irq(0x40, entry_40);
64 // set vector 0x79 to zero
65 // this is used by 'gardian angel' protection system
68 __set_irq(0x1E, &diskette_param_table2);
74 dprintf(3, "init bda\n");
76 struct bios_data_area_s *bda = MAKE_FLATPTR(SEG_BDA, 0);
77 memset(bda, 0, sizeof(*bda));
79 int esize = EBDA_SIZE_START;
80 SET_BDA(mem_size_kb, 640 - esize);
81 u16 eseg = EBDA_SEGMENT_START;
82 SET_BDA(ebda_seg, eseg);
85 struct extended_bios_data_area_s *ebda = get_ebda_ptr();
86 memset(ebda, 0, sizeof(*ebda));
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)
140 if (CONFIG_COREBOOT) {
141 coreboot_copy_biostable();
188 floppy_drive_setup();
198 // 32-bit entry point.
204 debug_serial_setup();
205 dprintf(1, "Start bios\n");
207 // Allow writes to modify bios area (0xf0000)
208 make_bios_writable();
210 // Perform main setup code.
216 // Setup bios checksum.
217 BiosChecksum -= checksum((u8*)BUILD_BIOS_ADDR, BUILD_BIOS_SIZE);
219 // Prep for boot process.
220 make_bios_readonly();
222 // Invoke int 19 to start boot process.
223 dprintf(3, "Jump to int19\n");
225 memset(&br, 0, sizeof(br));
226 call16_int(0x19, &br);