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libpayload: Parse the ACPI RSDP table entry

Change-Id: I583cda63c3f0b58f8d198ed5ecea7c4619c7a897
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
---
M payloads/libpayload/include/coreboot_tables.h
M payloads/libpayload/include/sysinfo.h
M payloads/libpayload/libc/coreboot.c
3 files changed, 21 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/76/62576/1

diff --git a/payloads/libpayload/include/coreboot_tables.h b/payloads/libpayload/include/coreboot_tables.h
index 3fd3fc8..0e0078f 100644
--- a/payloads/libpayload/include/coreboot_tables.h
+++ b/payloads/libpayload/include/coreboot_tables.h
@@ -83,6 +83,7 @@
 	CB_TAG_BOARD_CONFIG		= 0x0040,
 	CB_TAG_ACPI_CNVS		= 0x0041,
 	CB_TAG_TYPE_C_INFO		= 0x0042,
+	CB_TAG_ACPI_RSDP                = 0x0043,
 	CB_TAG_CMOS_OPTION_TABLE	= 0x00c8,
 	CB_TAG_OPTION			= 0x00c9,
 	CB_TAG_OPTION_ENUM		= 0x00ca,
@@ -422,6 +423,16 @@
 	u32 type;
 };
 
+/*
+ * Handoff the ACPI RSDP
+ */
+struct cb_acpi_rsdp {
+	uint32_t tag;
+	uint32_t size;
+	uint64_t rsdp_pointer; /* Address of the ACPI RSDP */
+} __packed;
+
+
 /* Helpful inlines */
 
 static inline u64 cb_unpack64(struct cbuint64 val)
diff --git a/payloads/libpayload/include/sysinfo.h b/payloads/libpayload/include/sysinfo.h
index 376f298..d0afde8 100644
--- a/payloads/libpayload/include/sysinfo.h
+++ b/payloads/libpayload/include/sysinfo.h
@@ -110,6 +110,7 @@
 	uintptr_t mrc_cache;
 	uintptr_t acpi_gnvs;
 	uintptr_t acpi_cnvs;
+	uintptr_t acpi_rsdp;
 
 #define UNDEFINED_STRAPPING_ID	(~0)
 #define UNDEFINED_FW_CONFIG	~((uint64_t)0)
diff --git a/payloads/libpayload/libc/coreboot.c b/payloads/libpayload/libc/coreboot.c
index 72d7664..9a6b9e2 100644
--- a/payloads/libpayload/libc/coreboot.c
+++ b/payloads/libpayload/libc/coreboot.c
@@ -265,6 +265,12 @@
 	}
 }
 
+static void cb_parse_rsdp(void *ptr, struct sysinfo_t *info)
+{
+	const struct cb_acpi_rsdp *cb_acpi_rsdp = ptr;
+	info->acpi_rsdp = cb_acpi_rsdp->rsdp_pointer;
+}
+
 int cb_parse_header(void *addr, int len, struct sysinfo_t *info)
 {
 	struct cb_header *header;
@@ -405,6 +411,9 @@
 			cb_parse_tsc_info(ptr, info);
 			break;
 #endif
+		case CB_TAG_ACPI_RSDP:
+			cb_parse_rsdp(ptr, info);
+			break;
 		default:
 			cb_parse_arch_specific(rec, info);
 			break;

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