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/* 2006.1 yhlu add mptable cross 0x467 processing */
#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, new_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;
/* 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;
/* copy the smp block to address 0 */
post_code(0x96);
/* The smp table must be in 0-1K, 639K-640K, or 960K-1M */
new_low_table_end = write_smp_table(low_table_end);
#if HAVE_MP_TABLE==1
/* Don't write anything in the traditional x86 BIOS data segment,
* for example the linux kernel smp need to use 0x467 to pass reset vector
*/
if(new_low_table_end>0x467){
unsigned mptable_size = new_low_table_end - low_table_end - SMP_FLOATING_TABLE_LEN;
/* We can not put mptable here, we need to copy them to somewhere else*/
if((rom_table_end+mptable_size)<0x100000) {
/* We can copy mptable on rom_table, and leave low space for lbtable */
printk_debug("move mptable to 0x%0x\n", rom_table_end);
memcpy((unsigned char *)rom_table_end, (unsigned char *)(low_table_end+SMP_FLOATING_TABLE_LEN), mptable_size);
memset((unsigned char *)low_table_end, '\0', mptable_size + SMP_FLOATING_TABLE_LEN);
smp_write_floating_table_physaddr(low_table_end, rom_table_end);
low_table_end += SMP_FLOATING_TABLE_LEN;
rom_table_end += mptable_size;
rom_table_end = (rom_table_end+1023) & ~1023;
} else {
/* We can need to put mptable low and from 0x500 */
printk_debug("move mptable to 0x%0x\n", 0x500);
memcpy((unsigned char *)0x500, (unsigned char *)(low_table_end+SMP_FLOATING_TABLE_LEN), mptable_size);
memset((unsigned char *)low_table_end, '\0', 0x500-low_table_end);
smp_write_floating_table_physaddr(low_table_end, 0x500);
low_table_end = 0x500 + mptable_size;
}
}
#endif
/* 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, rom_table_end);
return get_lb_mem();
}
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