[PATCH v8 30/35] x86: Allow devices to write an SSDT

[Simon Glass]

Call the new core function to write the SSDT. This is made up of fragments
generated by devices that have the fill_ssdt() method.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v8:
- Update ACPI_DSTATUS enum

Changes in v3: None
Changes in v2:
- Use OEM_TABLE_ID instead of ACPI_TABLE_CREATOR

 arch/x86/lib/acpi_table.c | 50 +++++++++++++++++++++++++++++++++++++++
 include/acpi/acpi_table.h |  6 +++++
 2 files changed, 56 insertions(+)

diff --git a/arch/x86/lib/acpi_table.c b/arch/x86/lib/acpi_table.c
index 676370107f..0af9d47050 100644
--- a/arch/x86/lib/acpi_table.c
+++ b/arch/x86/lib/acpi_table.c
@@ -13,6 +13,7 @@
 #include <mapmem.h>
 #include <serial.h>
 #include <version.h>
+#include <acpi/acpigen.h>
 #include <acpi/acpi_table.h>
 #include <asm/acpi/global_nvs.h>
 #include <asm/ioapic.h>
@@ -353,6 +354,46 @@ static void acpi_create_spcr(struct acpi_spcr *spcr)
 	header->checksum = table_compute_checksum((void *)spcr, header->length);
 }
 
+static void acpi_ssdt_write_cbtable(struct acpi_ctx *ctx)
+{
+	uintptr_t base;
+	u32 size;
+
+	base = 0;
+	size = 0;
+
+	acpigen_write_device(ctx, "CTBL");
+	acpigen_write_coreboot_hid(ctx, COREBOOT_ACPI_ID_CBTABLE);
+	acpigen_write_name_integer(ctx, "_UID", 0);
+	acpigen_write_sta(ctx, ACPI_DSTATUS_HIDDEN_ON);
+	acpigen_write_name(ctx, "_CRS");
+	acpigen_write_resourcetemplate_header(ctx);
+	acpigen_write_mem32fixed(ctx, 0, base, size);
+	acpigen_write_resourcetemplate_footer(ctx);
+	acpigen_pop_len(ctx);
+}
+
+void acpi_create_ssdt(struct acpi_ctx *ctx, struct acpi_table_header *ssdt,
+		      const char *oem_table_id)
+{
+	memset((void *)ssdt, '\0', sizeof(struct acpi_table_header));
+
+	acpi_fill_header(ssdt, "SSDT");
+	ssdt->revision = acpi_get_table_revision(ACPITAB_SSDT);
+	ssdt->aslc_revision = 1;
+	ssdt->length = sizeof(struct acpi_table_header);
+
+	acpi_inc(ctx, sizeof(struct acpi_table_header));
+
+	/* Write object to declare coreboot tables */
+	acpi_ssdt_write_cbtable(ctx);
+	acpi_fill_ssdt(ctx);
+
+	/* (Re)calculate length and checksum. */
+	ssdt->length = ctx->current - (void *)ssdt;
+	ssdt->checksum = table_compute_checksum((void *)ssdt, ssdt->length);
+}
+
 /*
  * QEMU's version of write_acpi_tables is defined in drivers/misc/qfw.c
  */
@@ -362,6 +403,7 @@ ulong write_acpi_tables(ulong start_addr)
 	struct acpi_facs *facs;
 	struct acpi_table_header *dsdt;
 	struct acpi_fadt *fadt;
+	struct acpi_table_header *ssdt;
 	struct acpi_mcfg *mcfg;
 	struct acpi_madt *madt;
 	struct acpi_csrt *csrt;
@@ -417,6 +459,14 @@ ulong write_acpi_tables(ulong start_addr)
 	acpi_create_fadt(fadt, facs, dsdt);
 	acpi_add_table(ctx, fadt);
 
+	debug("ACPI:     * SSDT\n");
+	ssdt = (struct acpi_table_header *)ctx->current;
+	acpi_create_ssdt(ctx, ssdt, OEM_TABLE_ID);
+	if (ssdt->length > sizeof(struct acpi_table_header)) {
+		acpi_inc_align(ctx, ssdt->length);
+		acpi_add_table(ctx, ssdt);
+	}
+
 	debug("ACPI:    * MCFG\n");
 	mcfg = ctx->current;
 	acpi_create_mcfg(mcfg);
diff --git a/include/acpi/acpi_table.h b/include/acpi/acpi_table.h
index 3681c5c8ed..110b66345f 100644
--- a/include/acpi/acpi_table.h
+++ b/include/acpi/acpi_table.h
@@ -25,6 +25,12 @@
 
 struct acpi_ctx;
 
+/* List of ACPI HID that use the coreboot ACPI ID */
+enum coreboot_acpi_ids {
+	COREBOOT_ACPI_ID_CBTABLE	= 0x0000, /* BOOT0000 */
+	COREBOOT_ACPI_ID_MAX		= 0xFFFF, /* BOOTFFFF */
+};
+
 /*
  * RSDP (Root System Description Pointer)
  * Note: ACPI 1.0 didn't have length, xsdt_address, and ext_checksum
-- 
2.26.2.303.gf8c07b1a785-goog