#include "cmos.h" // CMOS_*
#include "util.h" // memset
#include "biosvar.h" // struct bios_data_area_s
-#include "ata.h" // ata_detect
+#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);
-
- // mov CMOS Equipment Byte to BDA Equipment Word
- SET_BDA(equipment_list_flags, inb_cmos(CMOS_EQUIPMENT_INFO));
-}
-
-static void
-init_handlers()
-{
- // 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);
}
SET_BDA(ebda_seg, SEG_EBDA);
SET_BDA(ivecs[0x41].seg, SEG_EBDA);
SET_BDA(ivecs[0x41].offset
- , offsetof(struct extended_bios_data_area_s, fdpt0));
+ , offsetof(struct extended_bios_data_area_s, fdpt[0]));
SET_BDA(ivecs[0x46].seg, SEG_EBDA);
SET_BDA(ivecs[0x41].offset
- , offsetof(struct extended_bios_data_area_s, fdpt1));
-}
-
-static void
-pit_setup()
-{
- // timer0: binary count, 16bit count, mode 2
- outb(0x34, PORT_PIT_MODE);
- // maximum count of 0000H = 18.2Hz
- outb(0x0, PORT_PIT_COUNTER0);
- outb(0x0, PORT_PIT_COUNTER0);
-}
-
-static u16
-detect_parport(u16 port, u8 timeout, u8 count)
-{
- // clear input mode
- outb(inb(port+2) & 0xdf, port+2);
-
- outb(0xaa, port);
- if (inb(port) != 0xaa)
- // Not present
- return 0;
- SET_BDA(port_lpt[count], port);
- SET_BDA(lpt_timeout[count], timeout);
- return 1;
-}
-
-static void
-lpt_setup()
-{
- u16 count = 0;
- count += detect_parport(0x378, 0x14, count);
- count += detect_parport(0x278, 0x14, count);
-
- // Equipment word bits 14..15 determing # parallel ports
- u16 eqb = GET_BDA(equipment_list_flags);
- SET_BDA(equipment_list_flags, (eqb & 0x3fff) | (count << 14));
-}
-
-static u16
-detect_serial(u16 port, u8 timeout, u8 count)
-{
- outb(0x02, port+1);
- if (inb(port+1) != 0x02)
- return 0;
- if (inb(port+2) != 0x02)
- return 0;
- outb(0x00, port+1);
- SET_BDA(port_com[count], port);
- SET_BDA(com_timeout[count], timeout);
- return 1;
-}
-
-static void
-serial_setup()
-{
- u16 count = 0;
- count += detect_serial(0x3f8, 0x0a, count);
- count += detect_serial(0x2f8, 0x0a, count);
- count += detect_serial(0x3e8, 0x0a, count);
- count += detect_serial(0x2e8, 0x0a, count);
-
- // Equipment word bits 9..11 determing # serial ports
- u16 eqb = GET_BDA(equipment_list_flags);
- SET_BDA(equipment_list_flags, (eqb & 0xf1ff) | (count << 9));
-}
-
-static u32
-bcd2bin(u8 val)
-{
- return (val & 0xf) + ((val >> 4) * 10);
-}
-
-static void
-timer_setup()
-{
- u32 seconds = bcd2bin(inb_cmos(CMOS_RTC_SECONDS));
- u32 ticks = (seconds * 18206507) / 1000000;
- u32 minutes = bcd2bin(inb_cmos(CMOS_RTC_MINUTES));
- ticks += (minutes * 10923904) / 10000;
- u32 hours = bcd2bin(inb_cmos(CMOS_RTC_HOURS));
- ticks += (hours * 65543427) / 1000;
- SET_BDA(timer_counter, ticks);
- SET_BDA(timer_rollover, 0);
+ , offsetof(struct extended_bios_data_area_s, fdpt[1]));
}
static void
-pic_setup()
+ram_probe(void)
{
- 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);
-}
-
-static void
-ata_init()
-{
- // hdidmap and cdidmap init.
- u8 device;
- for (device=0; device < CONFIG_MAX_ATA_DEVICES; device++) {
- ebda->ata.idmap[0][device] = CONFIG_MAX_ATA_DEVICES;
- ebda->ata.idmap[1][device] = CONFIG_MAX_ATA_DEVICES;
+ dprintf(3, "Find memory size\n");
+ if (CONFIG_COREBOOT) {
+ coreboot_fill_map();
+ } else {
+ // On emulators, get memory size from nvram.
+ 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);
}
-}
-
-static void
-fill_hdinfo(struct fdpt_s *info, u8 typecmos, u8 basecmos)
-{
- u8 type = inb_cmos(typecmos);
- if (type != 47)
- // XXX - halt
- return;
- info->precompensation = (inb_cmos(basecmos+4) << 8) | inb_cmos(basecmos+3);
- info->drive_control_byte = inb_cmos(basecmos+5);
- info->landing_zone = (inb_cmos(basecmos+7) << 8) | inb_cmos(basecmos+6);
- u16 cyl = (inb_cmos(basecmos+1) << 8) | inb_cmos(basecmos+0);
- u8 heads = inb_cmos(basecmos+2);
- u8 sectors = inb_cmos(basecmos+8);
- if (cyl < 1024) {
- // no logical CHS mapping used, just physical CHS
- // use Standard Fixed Disk Parameter Table (FDPT)
- info->cylinders = cyl;
- info->heads = heads;
- info->sectors = sectors;
- return;
- }
+ // Don't declare any memory between 0xa0000 and 0x100000
+ add_e820(0xa0000, 0x50000, E820_HOLE);
- // complies with Phoenix style Translated Fixed Disk Parameter
- // Table (FDPT)
- info->phys_cylinders = cyl;
- info->phys_heads = heads;
- info->phys_sectors = sectors;
- info->sectors = sectors;
- info->a0h_signature = 0xa0;
- if (cyl > 8192) {
- cyl >>= 4;
- heads <<= 4;
- } else if (cyl > 4096) {
- cyl >>= 3;
- heads <<= 3;
- } else if (cyl > 2048) {
- cyl >>= 2;
- heads <<= 2;
- }
- info->cylinders = cyl;
- info->heads = heads;
- info->checksum = -checksum((u8*)info, sizeof(*info)-1);
-}
+ // 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);
-static void
-hard_drive_post()
-{
- outb(0x0a, PORT_HD_DATA); // 0000 1010 = reserved, disable IRQ 14
- SET_BDA(disk_count, 1);
- SET_BDA(disk_control_byte, 0xc0);
-
- // move disk geometry data from CMOS to EBDA disk parameter table(s)
- u8 diskinfo = inb_cmos(CMOS_DISK_DATA);
- if ((diskinfo & 0xf0) == 0xf0)
- // Fill EBDA table for hard disk 0.
- fill_hdinfo(&ebda->fdpt0, CMOS_DISK_DRIVE1_TYPE, CMOS_DISK_DRIVE1_CYL);
- if ((diskinfo & 0x0f) == 0x0f)
- // XXX - bochs halts on any other type
- // Fill EBDA table for hard disk 1.
- fill_hdinfo(&ebda->fdpt1, CMOS_DISK_DRIVE2_TYPE, CMOS_DISK_DRIVE2_CYL);
+ 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;
ebda->ipl.count = ip - ebda->ipl.table;
ebda->ipl.sequence = 0xffff;
- ebda->ipl.bootfirst = 0xffff;
+ if (CONFIG_COREBOOT) {
+ // XXX - hardcode defaults for coreboot.
+ ebda->ipl.bootorder = 0x00000231;
+ ebda->ipl.checkfloppysig = 1;
+ } else {
+ // On emulators, get boot order from nvram.
+ ebda->ipl.bootorder = (inb_cmos(CMOS_BIOS_BOOTFLAG2)
+ | ((inb_cmos(CMOS_BIOS_BOOTFLAG1) & 0xf0) << 4));
+ if (!(inb_cmos(CMOS_BIOS_BOOTFLAG1) & 1))
+ ebda->ipl.checkfloppysig = 1;
+ }
}
+// 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()
{
- BX_INFO("Start bios\n");
-
init_bda();
- init_handlers();
init_ebda();
- pit_setup();
+ pic_setup();
+ timer_setup();
kbd_setup();
lpt_setup();
serial_setup();
- timer_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_post();
- if (CONFIG_ATA) {
- ata_init();
- ata_detect();
- }
+ 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.
+asm(
+ ".global post32\n"
+ "post32:\n"
+ "cli\n"
+ "cld\n"
+ "lidtl " __stringify(0xf0000 | OFFSET_pmode_IDT_info) "\n"
+ "lgdtl " __stringify(0xf0000 | OFFSET_rombios32_gdt_48) "\n"
+ "movl $" __stringify(BUILD_STACK_ADDR) ", %esp\n"
+ "ljmp $0x10, $_start\n"
+ );
projects / seabios.git / blobdiff