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/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <bootmem.h>
#include <boot/tables.h>
#include <boot/coreboot_tables.h>
#include <arch/pirq_routing.h>
#include <arch/smp/mpspec.h>
#include <acpi/acpi.h>
#include <commonlib/helpers.h>
#include <string.h>
#include <cbmem.h>
#include <smbios.h>
static unsigned long write_pirq_table(unsigned long rom_table_end)
{
unsigned long high_table_pointer;
#define MAX_PIRQ_TABLE_SIZE (4 * 1024)
post_code(POSTCODE_X86_WRITE_PIRQ_TABLE);
/* This table must be between 0x0f0000 and 0x100000 */
rom_table_end = write_pirq_routing_table(rom_table_end);
rom_table_end = ALIGN_UP(rom_table_end, 1024);
/* And add a high table version for those payloads that
* want to live in the F segment
*/
high_table_pointer = (unsigned long)cbmem_add(CBMEM_ID_PIRQ,
MAX_PIRQ_TABLE_SIZE);
if (high_table_pointer) {
unsigned long new_high_table_pointer;
new_high_table_pointer =
write_pirq_routing_table(high_table_pointer);
// FIXME make pirq table code intelligent enough to know how
// much space it's going to need.
if (new_high_table_pointer > (high_table_pointer
+ MAX_PIRQ_TABLE_SIZE))
printk(BIOS_ERR, "Increase PIRQ size.\n");
printk(BIOS_DEBUG, "PIRQ table: %ld bytes.\n",
new_high_table_pointer - high_table_pointer);
}
return rom_table_end;
}
static unsigned long write_mptable(unsigned long rom_table_end)
{
unsigned long high_table_pointer;
#define MAX_MP_TABLE_SIZE (4 * 1024)
post_code(POSTCODE_X86_WRITE_MPTABLE);
/* The smp table must be in 0-1K, 639K-640K, or 960K-1M */
rom_table_end = write_smp_table(rom_table_end);
rom_table_end = ALIGN_UP(rom_table_end, 1024);
high_table_pointer = (unsigned long)cbmem_add(CBMEM_ID_MPTABLE,
MAX_MP_TABLE_SIZE);
if (high_table_pointer) {
unsigned long new_high_table_pointer;
new_high_table_pointer = write_smp_table(high_table_pointer);
// FIXME make mp table code intelligent enough to know how
// much space it's going to need.
if (new_high_table_pointer > (high_table_pointer
+ MAX_MP_TABLE_SIZE))
printk(BIOS_ERR, "Increase MP table size.\n");
printk(BIOS_DEBUG, "MP table: %ld bytes.\n",
new_high_table_pointer - high_table_pointer);
}
return rom_table_end;
}
static unsigned long write_acpi_table(unsigned long rom_table_end)
{
unsigned long high_table_pointer;
const size_t max_acpi_size = CONFIG_MAX_ACPI_TABLE_SIZE_KB * KiB;
post_code(POSTCODE_X86_WRITE_ACPITABLE);
/* Write ACPI tables to F segment and high tables area */
/* Ok, this is a bit hacky still, because some day we want to have this
* completely dynamic. But right now we are setting fixed sizes.
* It's probably still better than the old high_table_base code because
* now at least we know when we have an overflow in the area.
*
* We want to use 1MB - 64K for Resume backup. We use 512B for TOC and
* 512 byte for GDT, 4K for PIRQ and 4K for MP table and 8KB for the
* coreboot table. This leaves us with 47KB for all of ACPI. Let's see
* how far we get.
*/
high_table_pointer = (unsigned long)cbmem_add(CBMEM_ID_ACPI,
max_acpi_size);
if (high_table_pointer) {
unsigned long acpi_start = high_table_pointer;
unsigned long new_high_table_pointer;
rom_table_end = ALIGN_UP(rom_table_end, 16);
new_high_table_pointer = write_acpi_tables(high_table_pointer);
if (new_high_table_pointer > (high_table_pointer
+ max_acpi_size)) {
printk(BIOS_CRIT, "ACPI tables overflowed and corrupted CBMEM!\n");
printk(BIOS_ERR, "Increase config MAX_ACPI_TABLE_SIZE_KB!\n");
}
printk(BIOS_DEBUG, "ACPI tables: %ld bytes.\n",
new_high_table_pointer - high_table_pointer);
/* Now we need to create a low table copy of the RSDP. */
/* First we look for the high table RSDP */
while (acpi_start < new_high_table_pointer) {
if (memcmp(((acpi_rsdp_t *)acpi_start)->signature,
RSDP_SIG, 8) == 0)
break;
acpi_start++;
}
/* Now, if we found the RSDP, we take the RSDT and XSDT pointer
* from it in order to write the low RSDP
*/
if (acpi_start < new_high_table_pointer) {
acpi_rsdp_t *low_rsdp = (acpi_rsdp_t *)rom_table_end,
*high_rsdp = (acpi_rsdp_t *)acpi_start;
/* Technically rsdp length varies but coreboot always
writes longest size available. */
memcpy(low_rsdp, high_rsdp, sizeof(acpi_rsdp_t));
} else {
printk(BIOS_ERR, "Didn't find RSDP in high table.\n");
}
rom_table_end = ALIGN_UP(rom_table_end + sizeof(acpi_rsdp_t), 16);
} else {
rom_table_end = write_acpi_tables(rom_table_end);
rom_table_end = ALIGN_UP(rom_table_end, 1024);
}
return rom_table_end;
}
static unsigned long write_smbios_table(unsigned long rom_table_end)
{
unsigned long high_table_pointer;
#define MAX_SMBIOS_SIZE (32 * KiB)
high_table_pointer = (unsigned long)cbmem_add(CBMEM_ID_SMBIOS,
MAX_SMBIOS_SIZE);
if (high_table_pointer) {
unsigned long new_high_table_pointer;
/*
* Clear the entire region to ensure the unused space doesn't
* contain garbage from a previous boot, like stale table
* signatures that could be found by the OS.
*/
memset((void *)high_table_pointer, 0, MAX_SMBIOS_SIZE);
new_high_table_pointer =
smbios_write_tables(high_table_pointer);
rom_table_end = ALIGN_UP(rom_table_end, 16);
memcpy((void *)rom_table_end, (void *)high_table_pointer,
sizeof(struct smbios_entry));
rom_table_end += sizeof(struct smbios_entry);
if (new_high_table_pointer > (high_table_pointer
+ MAX_SMBIOS_SIZE))
printk(BIOS_ERR, "Increase SMBIOS size\n");
printk(BIOS_DEBUG, "SMBIOS tables: %ld bytes.\n",
new_high_table_pointer - high_table_pointer);
} else {
unsigned long new_rom_table_end;
new_rom_table_end = smbios_write_tables(rom_table_end);
printk(BIOS_DEBUG, "SMBIOS size %ld bytes\n", new_rom_table_end
- rom_table_end);
rom_table_end = ALIGN_UP(new_rom_table_end, 16);
}
return rom_table_end;
}
/* Start forwarding table at 0x500, so we don't run into conflicts with the BDA
* in case our data structures grow beyond 0x400. Only GDT
* and the coreboot table use low_tables.
*/
#define FORWARDING_TABLE_ADDR ((uintptr_t)0x500)
static uintptr_t forwarding_table = FORWARDING_TABLE_ADDR;
void arch_write_tables(uintptr_t coreboot_table)
{
size_t sz;
unsigned long rom_table_end;
if (CONFIG(SHADOW_ROM_TABLE_TO_EBDA))
rom_table_end = CONFIG_DEFAULT_EBDA_SEGMENT << 4;
else
rom_table_end = 0xf0000;
/* This table must be between 0x0f0000 and 0x100000 */
if (CONFIG(GENERATE_PIRQ_TABLE))
rom_table_end = write_pirq_table(rom_table_end);
/* The smp table must be in 0-1K, 639K-640K, or 960K-1M */
if (CONFIG(GENERATE_MP_TABLE))
rom_table_end = write_mptable(rom_table_end);
if (CONFIG(HAVE_ACPI_TABLES))
rom_table_end = write_acpi_table(rom_table_end);
if (CONFIG(GENERATE_SMBIOS_TABLES))
rom_table_end = write_smbios_table(rom_table_end);
sz = write_coreboot_forwarding_table(forwarding_table, coreboot_table);
forwarding_table += sz;
/* Align up to page boundary for historical consistency. */
forwarding_table = ALIGN_UP(forwarding_table, 4*KiB);
/* Tell static analysis we know value is left unused. */
(void)rom_table_end;
}
void bootmem_arch_add_ranges(void)
{
/* Memory from 0 through the forwarding_table is reserved. */
const uintptr_t base = 0;
bootmem_add_range(base, forwarding_table - base, BM_MEM_TABLE);
/* Reserve Extend BIOS Data Area (EBDA) region explicitly */
bootmem_add_range((uintptr_t)CONFIG_DEFAULT_EBDA_SEGMENT << 4,
CONFIG_DEFAULT_EBDA_SIZE, BM_MEM_TABLE);
}
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