diff options
Diffstat (limited to 'lib/acpi/base.c')
-rw-r--r-- | lib/acpi/base.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/lib/acpi/base.c b/lib/acpi/base.c new file mode 100644 index 0000000000..3e8d703934 --- /dev/null +++ b/lib/acpi/base.c @@ -0,0 +1,92 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Write base ACPI tables + * + * Copyright 2021 Google LLC + */ + +#include <common.h> +#include <acpi/acpi_table.h> +#include <dm/acpi.h> +#include <mapmem.h> +#include <tables_csum.h> + +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)); +} + +static int acpi_write_base(struct acpi_ctx *ctx, + const struct acpi_writer *entry) +{ + /* 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(ctx->base, '\0', ctx->current - ctx->base); + + acpi_write_rsdp(ctx->rsdp, ctx->rsdt, ctx->xsdt); + acpi_write_rsdt(ctx->rsdt); + acpi_write_xsdt(ctx->xsdt); + + return 0; +} +/* + * Per ACPI spec, the FACS table address must be aligned to a 64-byte boundary + * (Windows checks this, but Linux does not). + * + * Use the '0' prefix to put this one first + */ +ACPI_WRITER(0base, NULL, acpi_write_base, ACPIWF_ALIGN64); |