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#include <stdbool.h>
#include "bios.h"
#include "stdio.h"
#include "e820.h"
#include "string.h"
#include "segment.h"
#include "fw_cfg.h"
#include "pci.h"
#include "benchmark.h"
#include "smbios.h"
static void set_realmode_int(int vec, void *p)
{
uint16_t *realmode_idt = (uint16_t *) 0;
realmode_idt[vec * 2] = flat_to_off16((uintptr_t) p);
realmode_idt[vec * 2 + 1] = flat_to_seg16((uintptr_t) p);
}
static void setup_idt(void)
{
int i;
for (i = 0; i < 0x100; i++)
set_realmode_int(i, bios_intfake);
for (i = 8; i < 16; i++)
set_realmode_int(i, bios_irq);
for (i = 0x70; i < 0x78; i++)
set_realmode_int(i, bios_irq);
set_realmode_int(0x10, bios_int10);
set_realmode_int(0x15, bios_int15);
}
/* Top of memory below 4GB. */
uint32_t lowmem;
struct e820map *e820;
static bool have_mmconfig;
static void extract_e820(void)
{
int id = fw_cfg_file_id("etc/e820");
uint32_t size;
int nr_map;
int i;
if (id == -1)
panic();
size = fw_cfg_file_size(id);
nr_map = size / sizeof(e820->map[0]) + 5;
e820 = malloc(offsetof(struct e820map, map[nr_map]));
e820->nr_map = nr_map;
e820->map[0] = (struct e820entry)
{ .addr = 0, .size = 639 * 1024, .type = E820_RAM }; /* low RAM */
e820->map[1] = (struct e820entry)
{ .addr = 639 * 1024, .size = 1024, .type = E820_RESERVED }; /* EBDA */
e820->map[2] = (struct e820entry)
{ .addr = 0xd0000, .size = 128 * 1024, .type = E820_NVS }; /* ACPI tables */
e820->map[3] = (struct e820entry)
{ .addr = 0xf0000, .size = 64 * 1024, .type = E820_RESERVED }; /* firmware */
i = 4;
if (have_mmconfig)
e820->map[i++] = (struct e820entry)
{ .addr = PCIE_MMCONFIG_BASE, .size = PCIE_MMCONFIG_SIZE, .type = E820_RESERVED };
else
nr_map--;
fw_cfg_read_file(id, &e820->map[i], size);
for (; i < e820->nr_map; i++)
if (e820->map[i].addr == 0) {
lowmem = e820->map[i].size;
e820->map[i].addr = 1024 * 1024;
e820->map[i].size -= 1024 * 1024;
break;
}
e820_seg = ((uintptr_t) e820) >> 4;
}
int __attribute__ ((section (".text.startup"))) main(void)
{
bool have_pci;
#ifdef BENCHMARK_HACK
outb(FW_EXIT_PORT, FW_START);
#endif
have_pci = setup_hw();
// Only the 16-bit trampoline for vmlinuz and the 16-bit interrupt
// handlers need to run from the F-segment, but keep things simple
// and jump there. From this point we can modify global variables.
asm("ljmp $0x8, $1f; 1:");
have_mmconfig = setup_mmconfig();
if (have_pci) {
setup_pci();
}
setup_idt();
fw_cfg_setup();
extract_acpi();
extract_e820();
setup_mptable();
extract_smbios();
boot_from_fwcfg();
panic();
}
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