1 // 32bit code to Power On Self Test (POST) a machine.
3 // Copyright (C) 2008-2010 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 "ahci.h" // ahci_setup
16 #include "memmap.h" // add_e820
17 #include "pic.h" // pic_setup
18 #include "pci.h" // create_pirtable
19 #include "acpi.h" // acpi_bios_init
20 #include "bregs.h" // struct bregs
21 #include "mptable.h" // mptable_init
22 #include "boot.h" // IPL
23 #include "usb.h" // usb_setup
24 #include "smbios.h" // smbios_init
25 #include "paravirt.h" // qemu_cfg_port_probe
26 #include "xen.h" // xen_probe_hvm_info
27 #include "ps2port.h" // ps2port_setup
28 #include "virtio-blk.h" // virtio_blk_setup
31 /****************************************************************
33 ****************************************************************/
38 dprintf(3, "init ivt\n");
40 // Initialize all vectors to the default handler.
43 SET_IVT(i, FUNC16(entry_iret_official));
45 // Initialize all hw vectors to a default hw handler.
46 for (i=0x08; i<=0x0f; i++)
47 SET_IVT(i, FUNC16(entry_hwpic1));
48 for (i=0x70; i<=0x77; i++)
49 SET_IVT(i, FUNC16(entry_hwpic2));
51 // Initialize software handlers.
52 SET_IVT(0x02, FUNC16(entry_02));
53 SET_IVT(0x10, FUNC16(entry_10));
54 SET_IVT(0x11, FUNC16(entry_11));
55 SET_IVT(0x12, FUNC16(entry_12));
56 SET_IVT(0x13, FUNC16(entry_13_official));
57 SET_IVT(0x14, FUNC16(entry_14));
58 SET_IVT(0x15, FUNC16(entry_15));
59 SET_IVT(0x16, FUNC16(entry_16));
60 SET_IVT(0x17, FUNC16(entry_17));
61 SET_IVT(0x18, FUNC16(entry_18));
62 SET_IVT(0x19, FUNC16(entry_19_official));
63 SET_IVT(0x1a, FUNC16(entry_1a));
64 SET_IVT(0x40, FUNC16(entry_40));
66 // INT 60h-66h reserved for user interrupt
67 for (i=0x60; i<=0x66; i++)
68 SET_IVT(i, SEGOFF(0, 0));
70 // set vector 0x79 to zero
71 // this is used by 'gardian angel' protection system
72 SET_IVT(0x79, SEGOFF(0, 0));
74 SET_IVT(0x1E, SEGOFF(SEG_BIOS, (u32)&diskette_param_table2 - BUILD_BIOS_ADDR));
80 dprintf(3, "init bda\n");
82 struct bios_data_area_s *bda = MAKE_FLATPTR(SEG_BDA, 0);
83 memset(bda, 0, sizeof(*bda));
85 int esize = EBDA_SIZE_START;
86 SET_BDA(mem_size_kb, BUILD_LOWRAM_END/1024 - esize);
87 u16 ebda_seg = EBDA_SEGMENT_START;
88 SET_BDA(ebda_seg, ebda_seg);
91 struct extended_bios_data_area_s *ebda = get_ebda_ptr();
92 memset(ebda, 0, sizeof(*ebda));
95 add_e820((u32)MAKE_FLATPTR(ebda_seg, 0), GET_EBDA2(ebda_seg, size) * 1024
102 dprintf(3, "Find memory size\n");
103 if (CONFIG_COREBOOT) {
105 } else if (usingXen()) {
108 // On emulators, get memory size from nvram.
109 u32 rs = ((inb_cmos(CMOS_MEM_EXTMEM2_LOW) << 16)
110 | (inb_cmos(CMOS_MEM_EXTMEM2_HIGH) << 24));
112 rs += 16 * 1024 * 1024;
114 rs = (((inb_cmos(CMOS_MEM_EXTMEM_LOW) << 10)
115 | (inb_cmos(CMOS_MEM_EXTMEM_HIGH) << 18))
118 add_e820(0, rs, E820_RAM);
120 // Check for memory over 4Gig
121 u64 high = ((inb_cmos(CMOS_MEM_HIGHMEM_LOW) << 16)
122 | ((u32)inb_cmos(CMOS_MEM_HIGHMEM_MID) << 24)
123 | ((u64)inb_cmos(CMOS_MEM_HIGHMEM_HIGH) << 32));
124 RamSizeOver4G = high;
125 add_e820(0x100000000ull, high, E820_RAM);
127 /* reserve 256KB BIOS area at the end of 4 GB */
128 add_e820(0xfffc0000, 256*1024, E820_RESERVED);
131 // Don't declare any memory between 0xa0000 and 0x100000
132 add_e820(BUILD_LOWRAM_END, BUILD_BIOS_ADDR-BUILD_LOWRAM_END, E820_HOLE);
134 // Mark known areas as reserved.
135 add_e820(BUILD_BIOS_ADDR, BUILD_BIOS_SIZE, E820_RESERVED);
137 u32 count = qemu_cfg_e820_entries();
139 struct e820_reservation entry;
142 for (i = 0; i < count; i++) {
143 qemu_cfg_e820_load_next(&entry);
144 add_e820(entry.address, entry.length, entry.type);
146 } else if (kvm_para_available()) {
147 // Backwards compatibility - provide hard coded range.
148 // 4 pages before the bios, 3 pages for vmx tss pages, the
149 // other page for EPT real mode pagetable
150 add_e820(0xfffbc000, 4*4096, E820_RESERVED);
153 dprintf(1, "Ram Size=0x%08x (0x%08x%08x high)\n"
154 , RamSize, (u32)(RamSizeOver4G >> 32), (u32)RamSizeOver4G);
158 init_bios_tables(void)
160 if (CONFIG_COREBOOT) {
161 coreboot_copy_biostable();
165 xen_copy_biostables();
178 // Initialize hardware devices
190 cbfs_payload_setup();
195 // Begin the boot process by invoking an int0x19 in 16bit mode.
199 // Clear low-memory allocations (required by PMM spec).
200 memset((void*)BUILD_STACK_ADDR, 0, BUILD_EBDA_MINIMUM - BUILD_STACK_ADDR);
202 dprintf(3, "Jump to int19\n");
204 memset(&br, 0, sizeof(br));
206 call16_int(0x19, &br);
213 // Running at new code address - do code relocation fixups
216 // Setup ivt/bda/ebda
220 // Init base pc hardware.
232 // Setup Xen hypercalls
233 xen_init_hypercalls();
235 // Initialize internal tables
238 // Start hardware initialization (if optionrom threading)
239 if (CONFIG_THREADS && CONFIG_THREAD_OPTIONROMS)
242 // Find and initialize other cpus
245 // Setup interfaces that option roms may need
253 // Run vga option rom
256 // Do hardware initialization (if running synchronously)
257 if (!CONFIG_THREADS || !CONFIG_THREAD_OPTIONROMS) {
265 // Run BCVs and show optional boot menu
268 // Finalize data structures before boot
274 // Setup bios checksum.
275 BiosChecksum -= checksum((u8*)BUILD_BIOS_ADDR, BUILD_BIOS_SIZE);
277 // Write protect bios memory.
278 make_bios_readonly();
280 // Invoke int 19 to start boot process.
285 /****************************************************************
286 * POST entry and code relocation
287 ****************************************************************/
289 // Update given relocs for the code at 'dest' with a given 'delta'
291 updateRelocs(void *dest, u32 *rstart, u32 *rend, u32 delta)
294 for (reloc = rstart; reloc < rend; reloc++)
295 *((u32*)(dest + *reloc)) += delta;
298 // Relocate init code and then call maininit() at new address.
302 if (!CONFIG_RELOCATE_INIT) {
306 // Symbols populated by the build.
307 extern u8 code32flat_start[];
308 extern u8 _reloc_min_align[];
309 extern u32 _reloc_abs_start[], _reloc_abs_end[];
310 extern u32 _reloc_rel_start[], _reloc_rel_end[];
311 extern u32 _reloc_init_start[], _reloc_init_end[];
312 extern u8 code32init_start[], code32init_end[];
314 // Allocate space for init code.
315 u32 initsize = code32init_end - code32init_start;
316 u32 align = (u32)&_reloc_min_align;
317 void *dest = memalign_tmp(align, initsize);
319 panic("No space for init relocation.\n");
321 // Copy code and update relocs (init absolute, init relative, and runtime)
322 dprintf(1, "Relocating init from %p to %p (size %d)\n"
323 , code32init_start, dest, initsize);
324 s32 delta = dest - (void*)code32init_start;
325 memcpy(dest, code32init_start, initsize);
326 updateRelocs(dest, _reloc_abs_start, _reloc_abs_end, delta);
327 updateRelocs(dest, _reloc_rel_start, _reloc_rel_end, -delta);
328 updateRelocs(code32flat_start, _reloc_init_start, _reloc_init_end, delta);
330 // Call maininit() in relocated code.
331 void (*func)(void) = (void*)maininit + delta;
336 // Setup for code relocation and then call reloc_init
342 // Detect ram and setup internal malloc.
343 qemu_cfg_port_probe();
347 // Relocate initialization code and call maininit().
351 // Entry point for Power On Self Test (POST) - the BIOS initilization
352 // phase. This function makes the memory at 0xc0000-0xfffff
353 // read/writable and then calls dopost().
357 debug_serial_setup();
358 dprintf(1, "Start bios (version %s)\n", VERSION);
360 // Enable CPU caching
361 setcr0(getcr0() & ~(CR0_CD|CR0_NW));
363 // Clear CMOS reboot flag.
364 outb_cmos(0, CMOS_RESET_CODE);
366 // Make sure legacy DMA isn't running.
369 // Check if we are running under Xen.
372 // Allow writes to modify bios area (0xf0000)
373 make_bios_writable();
375 // Now that memory is read/writable - start post process.