#include "cmos.h" // CMOS_*
#include "util.h" // memset
#include "biosvar.h" // struct bios_data_area_s
+#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 *)0)
-#define ebda ((struct extended_bios_data_area_s *)(EBDA_SEG<<4))
+#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++) {
- bda->ivecs[i].seg = 0xf000;
- bda->ivecs[i].offset = OFFSET_dummy_iret_handler;
+ SET_BDA(ivecs[i].seg, SEG_BIOS);
+ SET_BDA(ivecs[i].offset, OFFSET_dummy_iret_handler);
}
- bda->mem_size_kb = BASE_MEM_IN_K;
-}
+ 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[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[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[0x76].offset, OFFSET_entry_76);
-static void
-init_handlers()
-{
// set vector 0x79 to zero
// this is used by 'gardian angel' protection system
- bda->ivecs[0x79].seg = 0;
- bda->ivecs[0x79].offset = 0;
-
- bda->ivecs[0x40].offset = OFFSET_entry_40;
- bda->ivecs[0x0e].offset = OFFSET_entry_0e;
- bda->ivecs[0x13].offset = OFFSET_entry_13;
- bda->ivecs[0x76].offset = OFFSET_entry_76;
- bda->ivecs[0x17].offset = OFFSET_entry_17;
- bda->ivecs[0x18].offset = OFFSET_entry_18;
- bda->ivecs[0x19].offset = OFFSET_entry_19;
- bda->ivecs[0x1c].offset = OFFSET_entry_1c;
- bda->ivecs[0x12].offset = OFFSET_entry_12;
- bda->ivecs[0x11].offset = OFFSET_entry_11;
- bda->ivecs[0x15].offset = OFFSET_entry_15;
- bda->ivecs[0x08].offset = OFFSET_entry_08;
- bda->ivecs[0x09].offset = OFFSET_entry_09;
- bda->ivecs[0x16].offset = OFFSET_entry_16;
- bda->ivecs[0x14].offset = OFFSET_entry_14;
- bda->ivecs[0x1a].offset = OFFSET_entry_1a;
- bda->ivecs[0x70].offset = OFFSET_entry_70;
- bda->ivecs[0x74].offset = OFFSET_entry_74;
- bda->ivecs[0x75].offset = OFFSET_entry_75;
- bda->ivecs[0x10].offset = OFFSET_entry_10;
+ SET_BDA(ivecs[0x79].seg, 0);
+ SET_BDA(ivecs[0x79].offset, 0);
+
+ SET_BDA(ivecs[0x1E].offset, OFFSET_diskette_param_table2);
}
static void
init_ebda()
{
+ memset(ebda, 0, sizeof(*ebda));
ebda->size = EBDA_SIZE;
- bda->ebda_seg = EBDA_SEG;
- bda->ivecs[0x41].seg = EBDA_SEG;
- bda->ivecs[0x41].offset = 0x3d; // XXX
- bda->ivecs[0x46].seg = EBDA_SEG;
- bda->ivecs[0x46].offset = 0x4d; // XXX
-}
-
-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);
+ 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, fdpt[0]));
+ SET_BDA(ivecs[0x46].seg, SEG_EBDA);
+ SET_BDA(ivecs[0x41].offset
+ , offsetof(struct extended_bios_data_area_s, fdpt[1]));
}
static void
-kbd_init()
+ram_probe(void)
{
-}
-
-static void
-kbd_setup()
-{
- bda->kbd_mode = 0x10;
- bda->kbd_buf_head = bda->kbd_buf_tail = offsetof(struct bios_data_area_s, kbd_buf);
- bda->kbd_buf_start_offset = offsetof(struct bios_data_area_s, kbd_buf);
- bda->kbd_buf_end_offset = offsetof(struct bios_data_area_s, kbd_buf[sizeof(bda->kbd_buf)]);
- kbd_init();
-
- // XXX
- u16 eqb = bda->equipment_list_flags;
- eqb = (eqb & 0xff00) | inb_cmos(CMOS_EQUIPMENT_INFO);
- bda->equipment_list_flags = eqb;
-}
+ 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
-lpt_setup()
-{
- // XXX
-}
+ // Don't declare any memory between 0xa0000 and 0x100000
+ add_e820(0xa0000, 0x50000, E820_HOLE);
-static void
-serial_setup()
-{
- // XXX
-}
+ // 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 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;
- bda->timer_counter = ticks;
- bda->timer_rollover = 0;
+ dprintf(1, "ram_size=0x%08x\n", GET_EBDA(ram_size));
}
static void
-pic_setup()
-{
- outb(0x11, PORT_PIC1);
- outb(0x11, PORT_PIC2_DATA);
- 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
-floppy_drive_post()
+init_boot_vectors()
{
- u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
- u8 out = 0;
- if (type & 0xf0)
- out |= 0x07;
- if (type & 0x0f)
- out |= 0x70;
- bda->floppy_harddisk_info = out;
- outb(0x02, PORT_DMA1_MASK_REG);
-
- bda->ivecs[0x1E].offset = OFFSET_diskette_param_table2;
-}
+ dprintf(3, "init boot device ordering\n");
-static void
-cdemu_init()
-{
- //ebda->cdemu.active = 0;
-}
+ // Floppy drive
+ struct ipl_entry_s *ip = &ebda->ipl.table[0];
+ ip->type = IPL_TYPE_FLOPPY;
+ ip++;
-static void
-ata_init()
-{
-}
+ // First HDD
+ ip->type = IPL_TYPE_HARDDISK;
+ ip++;
-static void
-ata_detect()
-{
-}
+ // CDROM
+ if (CONFIG_CDROM_BOOT) {
+ ip->type = IPL_TYPE_CDROM;
+ ip++;
+ }
-static void
-hard_drive_post()
-{
+ ebda->ipl.count = ip - ebda->ipl.table;
+ ebda->ipl.sequence = 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
-init_boot_vectors()
+callrom(u16 seg, u16 offset)
{
+ struct bregs br;
+ memset(&br, 0, sizeof(br));
+ br.es = SEG_BIOS;
+ br.di = OFFSET_pnp_string + 1; // starts 1 past for alignment
+ br.cs = seg;
+ br.ip = offset;
+ call16(&br);
+
+ debug_serial_setup();
}
-static void __attribute__((noinline))
-call16(u16 seg, u16 offset)
-{
- u32 segoff = (seg << 16) | offset;
- asm volatile(
- "pushal\n" // Save registers
- "ljmp $0x20, %0\n" // Jump to 16bit transition code
- ".globl call16_resume\n"
- "call16_resume:\n" // point of return
- "popal\n" // restore registers
- : : "Z" (OFFSET_call16), "b" (segoff));
-}
-
-static int
-checksum(u8 *p, u32 len)
-{
- u32 i;
- u8 sum = 0;
- for (i=0; i<len; i++)
- sum += p[i];
- return sum;
-}
-
-#define PTR_TO_SEG(p) ((((u32)(p)) >> 4) & 0xf000)
-#define PTR_TO_OFFSET(p) (((u32)(p)) & 0xffff)
-
+// Find and run any "option roms" found in the given address range.
static void
-rom_scan()
+rom_scan(u32 start, u32 end)
{
- u8 *p = (u8*)0xc0000;
- for (; p <= (u8*)0xe0000; p += 2048) {
+ u8 *p = (u8*)start;
+ for (; p <= (u8*)end; p += 2048) {
u8 *rom = p;
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);
- call16(PTR_TO_SEG(rom), PTR_TO_OFFSET(rom + 3));
+ 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
// Found a device that thinks it can boot the system. Record
// its BEV and product name string.
- // XXX
+ if (ebda->ipl.count >= ARRAY_SIZE(ebda->ipl.table))
+ continue;
+
+ struct ipl_entry_s *ip = &ebda->ipl.table[ebda->ipl.count];
+ ip->type = IPL_TYPE_BEV;
+ ip->vector = (FARPTR_TO_SEG(rom) << 16) | entry;
+
+ u16 desc = *(u16*)&rom[0x1a+0x10];
+ if (desc)
+ ip->description = (u32)MAKE_FARPTR(FARPTR_TO_SEG(rom), desc);
+
+ ebda->ipl.count++;
}
}
+// Main setup code.
static void
-status_restart(u8 status)
+post()
{
-#if 0
- if (status == 0x05)
- eoi_jmp_post();
-#endif
+ init_bda();
+ init_ebda();
+
+ pic_setup();
+ timer_setup();
+ kbd_setup();
+ lpt_setup();
+ serial_setup();
+ mouse_setup();
+ mathcp_setup();
- BX_PANIC("Unimplemented shutdown status: %02x\n",(Bit8u)status);
+ memmap_setup();
+
+ ram_probe();
+
+ dprintf(1, "Scan for VGA option rom\n");
+ rom_scan(0xc0000, 0xc7800);
+
+ printf("BIOS - begin\n\n");
+
+ rombios32_init();
+
+ memmap_finalize();
+
+ floppy_drive_setup();
+ hard_drive_setup();
+
+ init_boot_vectors();
+
+ dprintf(1, "Scan for option roms\n");
+ rom_scan(0xc8000, 0xe0000);
}
+// Clear .bss section for C code.
static void
-post()
+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()
{
// first reset the DMA controllers
outb(0, PORT_DMA1_MASTER_CLEAR);
// then initialize the DMA controllers
outb(0xc0, PORT_DMA2_MODE_REG);
outb(0x00, PORT_DMA2_MASK_REG);
+}
+// Check if the machine was setup with a special restart vector.
+static void
+check_restart_status()
+{
// Get and then clear CMOS shutdown status.
u8 status = inb_cmos(CMOS_RESET_CODE);
outb_cmos(0, CMOS_RESET_CODE);
- if (status != 0x00 && status != 0x09 && status < 0x0d)
- status_restart(status);
-
- BX_INFO("Start bios");
-
- init_bda();
- init_handlers();
- init_ebda();
-
- pit_setup();
- kbd_setup();
- lpt_setup();
- serial_setup();
- timer_setup();
- pic_setup();
- //pci_setup();
- init_boot_vectors();
- rom_scan();
-
- printf("BIOS - begin\n\n");
+ if (status == 0x00 || status == 0x09 || status >= 0x0d)
+ // Normal post
+ return;
- floppy_drive_post();
- hard_drive_post();
- if (CONFIG_ATA) {
- ata_init();
- ata_detect();
+ if (status != 0x05) {
+ BX_PANIC("Unimplemented shutdown status: %02x\n", status);
+ return;
}
- cdemu_init();
- call16(0xf000, OFFSET_begin_boot);
+
+ // XXX - this is supposed to jump without changing any memory -
+ // but the stack has been altered by the time the code gets here.
+ eoi_pic2();
+ struct bregs br;
+ memset(&br, 0, sizeof(br));
+ br.cs = GET_BDA(jump_cs_ip) >> 16;
+ br.ip = GET_BDA(jump_cs_ip);
+ call16(&br);
}
-void VISIBLE
+// 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"
+ );