tables.c

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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(0x9a);
 
        /* 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(0x9b);
 
        /* 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(0x9c);
 
        /* 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_ERR, "Increase ACPI size\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 (4 * KiB)
 
        high_table_pointer = (unsigned long)cbmem_add(CBMEM_ID_SMBIOS,
                MAX_SMBIOS_SIZE);
        if (high_table_pointer) {
                unsigned long new_high_table_pointer;
 
                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 = 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);
}