acpi: Put table-setup code in its own function
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>
diff --git a/lib/acpi/acpi_table.c b/lib/acpi/acpi_table.c
index 4e354d3..59980bc 100644
--- a/lib/acpi/acpi_table.c
+++ b/lib/acpi/acpi_table.c
@@ -181,3 +181,85 @@
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);
+}