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#include <console/console.h>
#include <cpu/cpu.h>
#include <boot/tables.h>
#include <boot/linuxbios_tables.h>
#include <arch/pirq_routing.h>
#include <arch/smp/mpspec.h>
#include <arch/acpi.h>
#include "linuxbios_table.h"
// Global Descriptor Table, defined in c_start.S
extern uint8_t gdt;
extern uint8_t gdt_end;
/* i386 lgdt argument */
struct gdtarg {
unsigned short limit;
unsigned int base;
} __attribute__((packed));
// Copy GDT to new location and reload it
// 2003-07 by SONE Takeshi
// Ported from Etherboot to LinuxBIOS 2005-08 by Steve Magnani
void move_gdt(unsigned long newgdt)
{
uint16_t num_gdt_bytes = &gdt_end - &gdt;
struct gdtarg gdtarg;
printk_debug("Moving GDT to %#lx...", newgdt);
memcpy((void*)newgdt, &gdt, num_gdt_bytes);
gdtarg.base = newgdt;
gdtarg.limit = num_gdt_bytes - 1;
__asm__ __volatile__ ("lgdt %0\n\t" : : "m" (gdtarg));
printk_debug("ok\n");
}
struct lb_memory *write_tables(void)
{
unsigned long low_table_start, low_table_end;
unsigned long rom_table_start, rom_table_end;
rom_table_start = 0xf0000;
rom_table_end = 0xf0000;
/* Start low addr at 16 bytes instead of 0 because of a buglet
* in the generic linux unzip code, as it tests for the a20 line.
*/
low_table_start = 0;
low_table_end = 16;
post_code(0x9a);
/* This table must be betweeen 0xf0000 & 0x100000 */
rom_table_end = write_pirq_routing_table(rom_table_end);
rom_table_end = (rom_table_end + 1023) & ~1023;
/* copy the smp block to address 0 */
post_code(0x96);
/* The smp table must be in 0-1K, 639K-640K, or 960K-1M */
low_table_end = write_smp_table(low_table_end);
/* Write ACPI tables */
/* write them in the rom area because DSDT can be large (8K on epia-m) which
* pushes linuxbios table out of first 4K if set up in low table area
*/
rom_table_end = write_acpi_tables(rom_table_end);
rom_table_end = (rom_table_end+1023) & ~1023;
/* Don't write anything in the traditional x86 BIOS data segment */
if (low_table_end < 0x500) {
low_table_end = 0x500;
}
// Relocate the GDT to reserved memory, so it won't get clobbered
move_gdt(low_table_end);
low_table_end += &gdt_end - &gdt;
/* The linuxbios table must be in 0-4K or 960K-1M */
write_linuxbios_table(
low_table_start, low_table_end,
rom_table_start >> 10, rom_table_end >> 10);
return get_lb_mem();
}
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