4f1cb23426
https://openbios.org/roundup/linuxbios/issue55 This patch is a little bit enhanced, it keeps the ppc table consistent, which Yinghai's original patch did not. git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2342 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
112 lines
4 KiB
C
112 lines
4 KiB
C
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/* 2006.1 yhlu add mptable cross 0x467 processing */
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#include <console/console.h>
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#include <cpu/cpu.h>
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#include <boot/tables.h>
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#include <boot/linuxbios_tables.h>
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#include <arch/pirq_routing.h>
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#include <arch/smp/mpspec.h>
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#include <arch/acpi.h>
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#include "linuxbios_table.h"
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// Global Descriptor Table, defined in c_start.S
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extern uint8_t gdt;
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extern uint8_t gdt_end;
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/* i386 lgdt argument */
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struct gdtarg {
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unsigned short limit;
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unsigned int base;
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} __attribute__((packed));
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// Copy GDT to new location and reload it
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// 2003-07 by SONE Takeshi
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// Ported from Etherboot to LinuxBIOS 2005-08 by Steve Magnani
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void move_gdt(unsigned long newgdt)
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{
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uint16_t num_gdt_bytes = &gdt_end - &gdt;
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struct gdtarg gdtarg;
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printk_debug("Moving GDT to %#lx...", newgdt);
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memcpy((void*)newgdt, &gdt, num_gdt_bytes);
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gdtarg.base = newgdt;
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gdtarg.limit = num_gdt_bytes - 1;
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__asm__ __volatile__ ("lgdt %0\n\t" : : "m" (gdtarg));
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printk_debug("ok\n");
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}
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struct lb_memory *write_tables(void)
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{
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unsigned long low_table_start, low_table_end, new_low_table_end;
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unsigned long rom_table_start, rom_table_end;
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rom_table_start = 0xf0000;
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rom_table_end = 0xf0000;
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/* Start low addr at 16 bytes instead of 0 because of a buglet
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* in the generic linux unzip code, as it tests for the a20 line.
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*/
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low_table_start = 0;
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low_table_end = 16;
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post_code(0x9a);
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/* This table must be betweeen 0xf0000 & 0x100000 */
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rom_table_end = write_pirq_routing_table(rom_table_end);
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rom_table_end = (rom_table_end + 1023) & ~1023;
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/* Write ACPI tables */
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/* write them in the rom area because DSDT can be large (8K on epia-m) which
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* pushes linuxbios table out of first 4K if set up in low table area
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*/
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rom_table_end = write_acpi_tables(rom_table_end);
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rom_table_end = (rom_table_end+1023) & ~1023;
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/* copy the smp block to address 0 */
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post_code(0x96);
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/* The smp table must be in 0-1K, 639K-640K, or 960K-1M */
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new_low_table_end = write_smp_table(low_table_end);
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/* Don't write anything in the traditional x86 BIOS data segment,
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* for example the linux kernel smp need to use 0x467 to pass reset vector
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*/
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if(new_low_table_end>0x467){
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unsigned mptable_size = new_low_table_end - low_table_end - SMP_FLOATING_TABLE_LEN;
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/* We can not put mptable here, we need to copy them to somewhere else*/
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if((rom_table_end+mptable_size)<0x100000) {
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/* We can copy mptable on rom_table, and leave low space for lbtable */
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printk_debug("move mptable to 0x%0x\n", rom_table_end);
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memcpy((unsigned char *)rom_table_end, (unsigned char *)(low_table_end+SMP_FLOATING_TABLE_LEN), mptable_size);
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memset((unsigned char *)low_table_end, '\0', mptable_size + SMP_FLOATING_TABLE_LEN);
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smp_write_floating_table_physaddr(low_table_end, rom_table_end);
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low_table_end += SMP_FLOATING_TABLE_LEN;
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rom_table_end += mptable_size;
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rom_table_end = (rom_table_end+1023) & ~1023;
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} else {
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/* We can need to put mptable low and from 0x500 */
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printk_debug("move mptable to 0x%0x\n", 0x500);
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memcpy((unsigned char *)0x500, (unsigned char *)(low_table_end+SMP_FLOATING_TABLE_LEN), mptable_size);
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memset((unsigned char *)low_table_end, '\0', 0x500-low_table_end);
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smp_write_floating_table_physaddr(low_table_end, 0x500);
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low_table_end = 0x500 + mptable_size;
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}
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}
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/* Don't write anything in the traditional x86 BIOS data segment */
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if (low_table_end < 0x500) {
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low_table_end = 0x500;
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}
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// Relocate the GDT to reserved memory, so it won't get clobbered
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move_gdt(low_table_end);
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low_table_end += &gdt_end - &gdt;
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/* The linuxbios table must be in 0-4K or 960K-1M */
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write_linuxbios_table(
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low_table_start, low_table_end,
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rom_table_start, rom_table_end);
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return get_lb_mem();
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}
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