From f44ac13db26c5ab18ac2e35111acbf91841a2608 Mon Sep 17 00:00:00 2001
From: Vladimir Serbinenko <phcoder@gmail.com>
Date: Wed, 20 May 2015 19:52:01 +0200
Subject: [PATCH] Add TCPA table.

This allows SeaBIOS to fill it as necessary.
This is needed to make BitLocker work.

Change-Id: I35858cd31a90c799ee1a240547c4b4a80fa13dd8
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/10274
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
---
 src/arch/x86/boot/acpi.c         | 65 ++++++++++++++++++++++++++++++++
 src/arch/x86/include/arch/acpi.h |  7 ++++
 src/include/cbmem.h              |  1 +
 3 files changed, 73 insertions(+)

diff --git a/src/arch/x86/boot/acpi.c b/src/arch/x86/boot/acpi.c
index 48260fc162..a7a638ffa4 100644
--- a/src/arch/x86/boot/acpi.c
+++ b/src/arch/x86/boot/acpi.c
@@ -250,6 +250,61 @@ void acpi_create_mcfg(acpi_mcfg_t *mcfg)
 	header->checksum = acpi_checksum((void *)mcfg, header->length);
 }
 
+static void *get_tcpa_log(u32 *size)
+{
+	const struct cbmem_entry *ce;
+	const u32 tcpa_default_log_len = 0x10000;
+	void *lasa;
+	ce = cbmem_entry_find(CBMEM_ID_TCPA_LOG);
+	if (ce) {
+		lasa = cbmem_entry_start(ce);
+		*size = cbmem_entry_size(ce);
+		printk(BIOS_DEBUG, "TCPA log found at %p\n", lasa);
+		return lasa;
+	}
+	lasa = cbmem_add(CBMEM_ID_TCPA_LOG, tcpa_default_log_len);
+	if (!lasa) {
+		printk(BIOS_ERR, "TCPA log creation failed\n");
+		return NULL;
+	}
+
+	printk(BIOS_DEBUG, "TCPA log created at %p\n", lasa);
+	memset (lasa, 0, tcpa_default_log_len);
+
+	*size = tcpa_default_log_len;
+	return lasa;
+}
+
+static void acpi_create_tcpa(acpi_tcpa_t *tcpa)
+{
+	acpi_header_t *header = &(tcpa->header);
+	u32 tcpa_log_len;
+	void *lasa;
+
+	memset((void *)tcpa, 0, sizeof(acpi_tcpa_t));
+
+	lasa = get_tcpa_log(&tcpa_log_len);
+	if (!lasa) {
+		return;
+	}
+
+	/* Fill out header fields. */
+	memcpy(header->signature, "TCPA", 4);
+	memcpy(header->oem_id, OEM_ID, 6);
+	memcpy(header->oem_table_id, ACPI_TABLE_CREATOR, 8);
+	memcpy(header->asl_compiler_id, ASLC, 4);
+
+	header->length = sizeof(acpi_tcpa_t);
+	header->revision = 2;
+
+	tcpa->platform_class = 0;
+	tcpa->laml = tcpa_log_len;
+	tcpa->lasa = (u32) lasa;
+
+	/* Calculate checksum. */
+	header->checksum = acpi_checksum((void *)tcpa, header->length);
+}
+
 void acpi_create_ssdt_generator(acpi_header_t *ssdt, const char *oem_table_id)
 {
 	unsigned long current = (unsigned long)ssdt + sizeof(acpi_header_t);
@@ -688,6 +743,7 @@ unsigned long write_acpi_tables(unsigned long start)
 	acpi_header_t *ssdt;
 	acpi_header_t *dsdt;
 	acpi_mcfg_t *mcfg;
+	acpi_tcpa_t *tcpa;
 	acpi_madt_t *madt;
 	struct device *dev;
 	unsigned long fw;
@@ -805,6 +861,15 @@ unsigned long write_acpi_tables(unsigned long start)
 		acpi_add_table(rsdp, mcfg);
 	}
 
+	printk(BIOS_DEBUG, "ACPI:    * TCPA\n");
+	tcpa = (acpi_tcpa_t *) current;
+	acpi_create_tcpa(tcpa);
+	if (tcpa->header.length >= sizeof(acpi_tcpa_t)) {
+		current += tcpa->header.length;
+		ALIGN_CURRENT;
+		acpi_add_table(rsdp, tcpa);
+	}
+
 	printk(BIOS_DEBUG, "ACPI:    * MADT\n");
 
 	madt = (acpi_madt_t *) current;
diff --git a/src/arch/x86/include/arch/acpi.h b/src/arch/x86/include/arch/acpi.h
index 245599fa9d..10db820409 100644
--- a/src/arch/x86/include/arch/acpi.h
+++ b/src/arch/x86/include/arch/acpi.h
@@ -129,6 +129,13 @@ typedef struct acpi_mcfg {
 	u8 reserved[8];
 } __attribute__ ((packed)) acpi_mcfg_t;
 
+typedef struct acpi_tcpa {
+	struct acpi_table_header header;
+	u16 platform_class;
+	u32 laml;
+	u64 lasa;
+} __attribute__ ((packed)) acpi_tcpa_t;
+
 typedef struct acpi_mcfg_mmconfig {
 	u32 base_address;
 	u32 base_reserved;
diff --git a/src/include/cbmem.h b/src/include/cbmem.h
index 5fd67afa4c..afee873f42 100644
--- a/src/include/cbmem.h
+++ b/src/include/cbmem.h
@@ -79,6 +79,7 @@
 #define CBMEM_ID_VBOOT_HANDOFF	0x780074f0
 #define CBMEM_ID_VBOOT_WORKBUF	0x78007343
 #define CBMEM_ID_WIFI_CALIBRATION 0x57494649
+#define CBMEM_ID_TCPA_LOG	0x54435041
 
 #ifndef __ASSEMBLER__
 #include <stddef.h>