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acpi: Put table-setup code in its own function

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We always write three basic tables to ACPI at the start. Move this into
its own function, along with acpi_fill_header(), so we can write a test
for this code.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2020-04-26 09:19:51 -06:00
committed by Bin Meng
parent 29b351122e
commit 7e586f6907
4 changed files with 147 additions and 86 deletions
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82
lib/acpi/acpi_table.c
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@@ -181,3 +181,85 @@ int acpi_add_table(struct acpi_ctx *ctx, void *table)
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)
{
struct acpi_xsdt *xsdt;
ctx->current = start;
/* Align ACPI tables to 16 byte */
acpi_align(ctx);
/* 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));
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, xsdt);
acpi_write_rsdt(ctx->rsdt);
acpi_write_xsdt(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);
}