#include "ata.h" // hard_drive_setup
#include "kbd.h" // kbd_setup
#include "disk.h" // floppy_drive_setup
+#include "memmap.h" // add_e820
+#include "pic.h" // pic_setup
#define bda ((struct bios_data_area_s *)MAKE_FARPTR(SEG_BDA, 0))
#define ebda ((struct extended_bios_data_area_s *)MAKE_FARPTR(SEG_EBDA, 0))
static void
init_bda()
{
+ dprintf(3, "init bda\n");
memset(bda, 0, sizeof(*bda));
+ SET_BDA(mem_size_kb, BASE_MEM_IN_K);
+
int i;
for (i=0; i<256; i++) {
SET_BDA(ivecs[i].seg, SEG_BIOS);
SET_BDA(ivecs[i].offset, OFFSET_dummy_iret_handler);
}
- SET_BDA(mem_size_kb, BASE_MEM_IN_K);
-
- // Set BDA Equipment Word - 0x06 = FPU enable, mouse installed
- SET_BDA(equipment_list_flags, 0x06);
-
- // set vector 0x79 to zero
- // this is used by 'gardian angel' protection system
- SET_BDA(ivecs[0x79].seg, 0);
- SET_BDA(ivecs[0x79].offset, 0);
-
- SET_BDA(ivecs[0x40].offset, OFFSET_entry_40);
+ SET_BDA(ivecs[0x08].offset, OFFSET_entry_08);
+ SET_BDA(ivecs[0x09].offset, OFFSET_entry_09);
SET_BDA(ivecs[0x0e].offset, OFFSET_entry_0e);
+ SET_BDA(ivecs[0x10].offset, OFFSET_entry_10);
+ SET_BDA(ivecs[0x11].offset, OFFSET_entry_11);
+ SET_BDA(ivecs[0x12].offset, OFFSET_entry_12);
SET_BDA(ivecs[0x13].offset, OFFSET_entry_13);
- SET_BDA(ivecs[0x76].offset, OFFSET_entry_76);
+ SET_BDA(ivecs[0x14].offset, OFFSET_entry_14);
+ SET_BDA(ivecs[0x15].offset, OFFSET_entry_15);
+ SET_BDA(ivecs[0x16].offset, OFFSET_entry_16);
SET_BDA(ivecs[0x17].offset, OFFSET_entry_17);
SET_BDA(ivecs[0x18].offset, OFFSET_entry_18);
SET_BDA(ivecs[0x19].offset, OFFSET_entry_19);
- SET_BDA(ivecs[0x1c].offset, OFFSET_entry_1c);
- SET_BDA(ivecs[0x12].offset, OFFSET_entry_12);
- SET_BDA(ivecs[0x11].offset, OFFSET_entry_11);
- SET_BDA(ivecs[0x15].offset, OFFSET_entry_15);
- SET_BDA(ivecs[0x08].offset, OFFSET_entry_08);
- SET_BDA(ivecs[0x09].offset, OFFSET_entry_09);
- SET_BDA(ivecs[0x16].offset, OFFSET_entry_16);
- SET_BDA(ivecs[0x14].offset, OFFSET_entry_14);
SET_BDA(ivecs[0x1a].offset, OFFSET_entry_1a);
+ SET_BDA(ivecs[0x1c].offset, OFFSET_entry_1c);
+ SET_BDA(ivecs[0x40].offset, OFFSET_entry_40);
SET_BDA(ivecs[0x70].offset, OFFSET_entry_70);
SET_BDA(ivecs[0x74].offset, OFFSET_entry_74);
SET_BDA(ivecs[0x75].offset, OFFSET_entry_75);
- SET_BDA(ivecs[0x10].offset, OFFSET_entry_10);
+ SET_BDA(ivecs[0x76].offset, OFFSET_entry_76);
+
+ // set vector 0x79 to zero
+ // this is used by 'gardian angel' protection system
+ SET_BDA(ivecs[0x79].seg, 0);
+ SET_BDA(ivecs[0x79].offset, 0);
SET_BDA(ivecs[0x1E].offset, OFFSET_diskette_param_table2);
}
static void
ram_probe(void)
{
- u32 rs;
+ dprintf(3, "Find memory size\n");
if (CONFIG_COREBOOT) {
- // XXX - just hardcode for now.
- rs = 128*1024*1024;
+ coreboot_fill_map();
} else {
// On emulators, get memory size from nvram.
- rs = (inb_cmos(CMOS_MEM_EXTMEM2_LOW)
- | (inb_cmos(CMOS_MEM_EXTMEM2_HIGH) << 8)) * 65536;
+ u32 rs = (inb_cmos(CMOS_MEM_EXTMEM2_LOW)
+ | (inb_cmos(CMOS_MEM_EXTMEM2_HIGH) << 8)) * 65536;
if (rs)
rs += 16 * 1024 * 1024;
else
rs = ((inb_cmos(CMOS_MEM_EXTMEM_LOW)
| (inb_cmos(CMOS_MEM_EXTMEM_HIGH) << 8)) * 1024
+ 1 * 1024 * 1024);
+ SET_EBDA(ram_size, rs);
+ add_e820(0, rs, E820_RAM);
+
+ /* reserve 256KB BIOS area at the end of 4 GB */
+ add_e820(0xfffc0000, 256*1024, E820_RESERVED);
}
- SET_EBDA(ram_size, rs);
- BX_INFO("ram_size=0x%08x\n", rs);
-}
+ // Don't declare any memory between 0xa0000 and 0x100000
+ add_e820(0xa0000, 0x50000, E820_HOLE);
-static void
-pic_setup()
-{
- outb(0x11, PORT_PIC1);
- outb(0x11, PORT_PIC2);
- outb(0x08, PORT_PIC1_DATA);
- outb(0x70, PORT_PIC2_DATA);
- outb(0x04, PORT_PIC1_DATA);
- outb(0x02, PORT_PIC2_DATA);
- outb(0x01, PORT_PIC1_DATA);
- outb(0x01, PORT_PIC2_DATA);
- outb(0xb8, PORT_PIC1_DATA);
- if (CONFIG_PS2_MOUSE)
- outb(0x8f, PORT_PIC2_DATA);
- else
- outb(0x9f, PORT_PIC2_DATA);
+ // Mark known areas as reserved.
+ add_e820((u32)MAKE_FARPTR(SEG_EBDA, 0), EBDA_SIZE * 1024, E820_RESERVED);
+ add_e820((u32)MAKE_FARPTR(SEG_BIOS, 0), 0x10000, E820_RESERVED);
+
+ dprintf(1, "ram_size=0x%08x\n", GET_EBDA(ram_size));
}
static void
init_boot_vectors()
{
+ dprintf(3, "init boot device ordering\n");
+
// Floppy drive
struct ipl_entry_s *ip = &ebda->ipl.table[0];
ip->type = IPL_TYPE_FLOPPY;
}
}
+// Execute a given option rom.
static void
callrom(u16 seg, u16 offset)
{
br.cs = seg;
br.ip = offset;
call16(&br);
+
+ debug_serial_setup();
}
+// Find and run any "option roms" found in the given address range.
static void
rom_scan(u32 start, u32 end)
{
if (*(u16*)rom != 0xaa55)
continue;
u32 len = rom[2] * 512;
- if (checksum(rom, len) != 0)
+ u8 sum = checksum(rom, len);
+ if (sum != 0) {
+ dprintf(1, "Found option rom with bad checksum:"
+ " loc=%p len=%d sum=%x\n"
+ , rom, len, sum);
continue;
+ }
p = (u8*)(((u32)p + len) / 2048 * 2048);
+ dprintf(1, "Running option rom at %p\n", rom+3);
callrom(FARPTR_TO_SEG(rom), FARPTR_TO_OFFSET(rom + 3));
+ if (GET_BDA(ebda_seg) != SEG_EBDA)
+ BX_PANIC("Option rom at %p attempted to move ebda from %x to %x\n"
+ , rom, SEG_EBDA, GET_BDA(ebda_seg));
+
// Look at the ROM's PnP Expansion header. Properly, we're supposed
// to init all the ROMs and then go back and build an IPL table of
// all the bootable devices, but we can get away with one pass.
}
}
+// Main setup code.
static void
post()
{
- if (CONFIG_DEBUG_SERIAL)
- debug_serial_setup();
-
- BX_INFO("Start bios\n");
-
init_bda();
init_ebda();
+ pic_setup();
timer_setup();
kbd_setup();
lpt_setup();
serial_setup();
- pic_setup();
+ mouse_setup();
+ mathcp_setup();
+
+ memmap_setup();
ram_probe();
+ dprintf(1, "Scan for VGA option rom\n");
rom_scan(0xc0000, 0xc7800);
printf("BIOS - begin\n\n");
- // clear bss section -- XXX - shouldn't use globals
- extern char __bss_start[], __bss_end[];
- memset(__bss_start, 0, __bss_end - __bss_start);
-
rombios32_init();
+ memmap_finalize();
+
floppy_drive_setup();
hard_drive_setup();
init_boot_vectors();
+ dprintf(1, "Scan for option roms\n");
rom_scan(0xc8000, 0xe0000);
+}
- interactive_bootmenu();
-
- // reset the memory (some boot loaders such as syslinux suppose
- // that the memory is set to zero)
- memset((void*)0x40000, 0, 0x40000); // XXX - shouldn't use globals
-
- // Invoke int 19 to start boot process.
- struct bregs br;
- memset(&br, 0, sizeof(br));
- call16_int(0x19, &br);
+// Clear .bss section for C code.
+static void
+clear_bss()
+{
+ dprintf(3, "clearing .bss section\n");
+ extern char __bss_start[], __bss_end[];
+ memset(__bss_start, 0, __bss_end - __bss_start);
}
+// Reset DMA controller
static void
init_dma()
{
outb(0x00, PORT_DMA2_MASK_REG);
}
+// Check if the machine was setup with a special restart vector.
static void
check_restart_status()
{
// XXX - this is supposed to jump without changing any memory -
// but the stack has been altered by the time the code gets here.
- eoi_both_pics();
+ eoi_pic2();
struct bregs br;
memset(&br, 0, sizeof(br));
br.cs = GET_BDA(jump_cs_ip) >> 16;
call16(&br);
}
+// 32-bit entry point.
void VISIBLE32
_start()
{
init_dma();
check_restart_status();
+ debug_serial_setup();
+ dprintf(1, "Start bios\n");
+
+ // Setup for .bss and .data sections
+ clear_bss();
+ make_bios_writable();
+
+ // Perform main setup code.
post();
+
+ // Present the user with a bootup menu.
+ interactive_bootmenu();
+
+ // Prep for boot process.
+ make_bios_readonly();
+ clear_bss();
+
+ // Invoke int 19 to start boot process.
+ dprintf(3, "Jump to int19\n");
+ struct bregs br;
+ memset(&br, 0, sizeof(br));
+ call16_int(0x19, &br);
}
// Externally visible 32bit entry point.
"cld\n"
"lidtl " __stringify(0xf0000 | OFFSET_pmode_IDT_info) "\n"
"lgdtl " __stringify(0xf0000 | OFFSET_rombios32_gdt_48) "\n"
- "movl $" __stringify(CONFIG_STACK_OFFSET) ", %esp\n"
+ "movl $" __stringify(BUILD_STACK_ADDR) ", %esp\n"
"ljmp $0x10, $_start\n"
);
projects / seabios.git / blobdiff