u-boot/lib/acpi/acpi_table.c
Simon Glass 61cc93396a acpi: Support generation of ACPI code
Add a new file to handle generating ACPI code programatically. This is
used when information must be dynamically added to the tables, e.g. the
SSDT.

Initial support is just for writing simple values. Also add a 'base' value
so that the table can be freed. This likely doesn't happen in normal code,
but is nice to do in tests.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2020-07-17 14:32:24 +08:00

266 lines
6.5 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Generic code used to generate ACPI tables
*
* Copyright 2019 Google LLC
*/
#include <common.h>
#include <dm.h>
#include <cpu.h>
#include <log.h>
#include <mapmem.h>
#include <tables_csum.h>
#include <version.h>
#include <acpi/acpi_table.h>
#include <dm/acpi.h>
int acpi_create_dmar(struct acpi_dmar *dmar, enum dmar_flags flags)
{
struct acpi_table_header *header = &dmar->header;
struct cpu_info info;
struct udevice *cpu;
int ret;
ret = uclass_first_device(UCLASS_CPU, &cpu);
if (ret)
return log_msg_ret("cpu", ret);
ret = cpu_get_info(cpu, &info);
if (ret)
return log_msg_ret("info", ret);
memset((void *)dmar, 0, sizeof(struct acpi_dmar));
/* Fill out header fields. */
acpi_fill_header(&dmar->header, "DMAR");
header->length = sizeof(struct acpi_dmar);
header->revision = acpi_get_table_revision(ACPITAB_DMAR);
dmar->host_address_width = info.address_width - 1;
dmar->flags = flags;
return 0;
}
int acpi_get_table_revision(enum acpi_tables table)
{
switch (table) {
case ACPITAB_FADT:
return ACPI_FADT_REV_ACPI_3_0;
case ACPITAB_MADT:
return ACPI_MADT_REV_ACPI_3_0;
case ACPITAB_MCFG:
return ACPI_MCFG_REV_ACPI_3_0;
case ACPITAB_TCPA:
/* This version and the rest are open-coded */
return 2;
case ACPITAB_TPM2:
return 4;
case ACPITAB_SSDT: /* ACPI 3.0 upto 6.3: 2 */
return 2;
case ACPITAB_SRAT: /* ACPI 2.0: 1, ACPI 3.0: 2, ACPI 4.0 to 6.3: 3 */
return 1; /* TODO Should probably be upgraded to 2 */
case ACPITAB_DMAR:
return 1;
case ACPITAB_SLIT: /* ACPI 2.0 upto 6.3: 1 */
return 1;
case ACPITAB_SPMI: /* IMPI 2.0 */
return 5;
case ACPITAB_HPET: /* Currently 1. Table added in ACPI 2.0 */
return 1;
case ACPITAB_VFCT: /* ACPI 2.0/3.0/4.0: 1 */
return 1;
case ACPITAB_IVRS:
return IVRS_FORMAT_FIXED;
case ACPITAB_DBG2:
return 0;
case ACPITAB_FACS: /* ACPI 2.0/3.0: 1, ACPI 4.0 to 6.3: 2 */
return 1;
case ACPITAB_RSDT: /* ACPI 1.0 upto 6.3: 1 */
return 1;
case ACPITAB_XSDT: /* ACPI 2.0 upto 6.3: 1 */
return 1;
case ACPITAB_RSDP: /* ACPI 2.0 upto 6.3: 2 */
return 2;
case ACPITAB_HEST:
return 1;
case ACPITAB_NHLT:
return 5;
case ACPITAB_BERT:
return 1;
case ACPITAB_SPCR:
return 2;
default:
return -EINVAL;
}
}
void acpi_fill_header(struct acpi_table_header *header, char *signature)
{
memcpy(header->signature, signature, 4);
memcpy(header->oem_id, OEM_ID, 6);
memcpy(header->oem_table_id, OEM_TABLE_ID, 8);
header->oem_revision = U_BOOT_BUILD_DATE;
memcpy(header->aslc_id, ASLC_ID, 4);
}
void acpi_align(struct acpi_ctx *ctx)
{
ctx->current = (void *)ALIGN((ulong)ctx->current, 16);
}
void acpi_align64(struct acpi_ctx *ctx)
{
ctx->current = (void *)ALIGN((ulong)ctx->current, 64);
}
void acpi_inc(struct acpi_ctx *ctx, uint amount)
{
ctx->current += amount;
}
void acpi_inc_align(struct acpi_ctx *ctx, uint amount)
{
ctx->current += amount;
acpi_align(ctx);
}
/**
* Add an ACPI table to the RSDT (and XSDT) structure, recalculate length
* and checksum.
*/
int acpi_add_table(struct acpi_ctx *ctx, void *table)
{
int i, entries_num;
struct acpi_rsdt *rsdt;
struct acpi_xsdt *xsdt;
/* The RSDT is mandatory while the XSDT is not */
rsdt = ctx->rsdt;
/* This should always be MAX_ACPI_TABLES */
entries_num = ARRAY_SIZE(rsdt->entry);
for (i = 0; i < entries_num; i++) {
if (rsdt->entry[i] == 0)
break;
}
if (i >= entries_num) {
log_err("ACPI: Error: too many tables\n");
return -E2BIG;
}
/* Add table to the RSDT */
rsdt->entry[i] = map_to_sysmem(table);
/* Fix RSDT length or the kernel will assume invalid entries */
rsdt->header.length = sizeof(struct acpi_table_header) +
(sizeof(u32) * (i + 1));
/* Re-calculate checksum */
rsdt->header.checksum = 0;
rsdt->header.checksum = table_compute_checksum((u8 *)rsdt,
rsdt->header.length);
/*
* And now the same thing for the XSDT. We use the same index as for
* now we want the XSDT and RSDT to always be in sync in U-Boot
*/
xsdt = ctx->xsdt;
/* Add table to the XSDT */
xsdt->entry[i] = map_to_sysmem(table);
/* Fix XSDT length */
xsdt->header.length = sizeof(struct acpi_table_header) +
(sizeof(u64) * (i + 1));
/* Re-calculate checksum */
xsdt->header.checksum = 0;
xsdt->header.checksum = table_compute_checksum((u8 *)xsdt,
xsdt->header.length);
return 0;
}
static void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt,
struct acpi_xsdt *xsdt)
{
memset(rsdp, 0, sizeof(struct acpi_rsdp));
memcpy(rsdp->signature, RSDP_SIG, 8);
memcpy(rsdp->oem_id, OEM_ID, 6);
rsdp->length = sizeof(struct acpi_rsdp);
rsdp->rsdt_address = map_to_sysmem(rsdt);
rsdp->xsdt_address = map_to_sysmem(xsdt);
rsdp->revision = ACPI_RSDP_REV_ACPI_2_0;
/* Calculate checksums */
rsdp->checksum = table_compute_checksum(rsdp, 20);
rsdp->ext_checksum = table_compute_checksum(rsdp,
sizeof(struct acpi_rsdp));
}
static void acpi_write_rsdt(struct acpi_rsdt *rsdt)
{
struct acpi_table_header *header = &rsdt->header;
/* Fill out header fields */
acpi_fill_header(header, "RSDT");
header->length = sizeof(struct acpi_rsdt);
header->revision = 1;
/* Entries are filled in later, we come with an empty set */
/* Fix checksum */
header->checksum = table_compute_checksum(rsdt,
sizeof(struct acpi_rsdt));
}
static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
{
struct acpi_table_header *header = &xsdt->header;
/* Fill out header fields */
acpi_fill_header(header, "XSDT");
header->length = sizeof(struct acpi_xsdt);
header->revision = 1;
/* Entries are filled in later, we come with an empty set */
/* Fix checksum */
header->checksum = table_compute_checksum(xsdt,
sizeof(struct acpi_xsdt));
}
void acpi_setup_base_tables(struct acpi_ctx *ctx, void *start)
{
ctx->base = start;
ctx->current = start;
/* Align ACPI tables to 16 byte */
acpi_align(ctx);
gd->arch.acpi_start = map_to_sysmem(ctx->current);
/* We need at least an RSDP and an RSDT Table */
ctx->rsdp = ctx->current;
acpi_inc_align(ctx, sizeof(struct acpi_rsdp));
ctx->rsdt = ctx->current;
acpi_inc_align(ctx, sizeof(struct acpi_rsdt));
ctx->xsdt = ctx->current;
acpi_inc_align(ctx, sizeof(struct acpi_xsdt));
/* clear all table memory */
memset((void *)start, '\0', ctx->current - start);
acpi_write_rsdp(ctx->rsdp, ctx->rsdt, ctx->xsdt);
acpi_write_rsdt(ctx->rsdt);
acpi_write_xsdt(ctx->xsdt);
/*
* Per ACPI spec, the FACS table address must be aligned to a 64 byte
* boundary (Windows checks this, but Linux does not).
*/
acpi_align64(ctx);
}