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authorLi-Ta Lo <ollie@lanl.gov>2005-03-04 22:03:07 +0000
committerLi-Ta Lo <ollie@lanl.gov>2005-03-04 22:03:07 +0000
commitbe977a14d18e4bda743a9cda25d3d76dfdfaad97 (patch)
tree1795ce3c6123c4166f5e91a67271de85372c2430 /src/arch
parentef5c64cca5c9a0a7461a18cc8db45ffea9dee5e8 (diff)
some comment in ACPI table
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1917 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/arch')
-rw-r--r--src/arch/i386/include/arch/acpi.h24
1 files changed, 14 insertions, 10 deletions
diff --git a/src/arch/i386/include/arch/acpi.h b/src/arch/i386/include/arch/acpi.h
index d51195527c..91cc10c109 100644
--- a/src/arch/i386/include/arch/acpi.h
+++ b/src/arch/i386/include/arch/acpi.h
@@ -39,14 +39,14 @@ typedef unsigned long long u64;
/* ACPI 2.0 table RSDP */
typedef struct acpi_rsdp {
- char signature[8];
- u8 checksum;
- char oem_id[6];
- u8 revision;
- u32 rsdt_address;
- u32 length;
- u64 xsdt_address;
- u8 ext_checksum;
+ char signature[8]; /* RSDP signature "RSD PTR" */
+ u8 checksum; /* checksum of the first 20 bytes */
+ char oem_id[6]; /* OEM ID, "LXBIOS" */
+ u8 revision; /* 0 for APCI 1.0, 2 for ACPI 2.0 */
+ u32 rsdt_address; /* physical address of RSDT */
+ u32 length; /* total length of RSDP (including extended part) */
+ u64 xsdt_address; /* physical address of XSDT */
+ u8 ext_checksum; /* chechsum of whole table */
u8 reserved[3];
} __attribute__((packed)) acpi_rsdp_t;
@@ -77,14 +77,18 @@ typedef struct acpi_table_header /* ACPI common table header */
} __attribute__ ((packed)) acpi_header_t;
/* RSDT */
-
typedef struct acpi_rsdt {
struct acpi_table_header header;
u32 entry[8];
} __attribute__ ((packed)) acpi_rsdt_t;
-/* HPET TIMERS */
+/* XSDT */
+typedef struct acpi_xsdt {
+ struct acpi_table_header header;
+ u64 entry[8];
+} __attribute__ ((packed)) acpi_xsdt_t;
+/* HPET TIMERS */
typedef struct acpi_hpet {
struct acpi_table_header header;
u32 id;