[acpi] Add support for ACPI power off

Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 75 insertions, 0 deletions

diff --git a/src/include/ipxe/acpi.h b/src/include/ipxe/acpi.h
index 2ccd691ed..17d29b9df 100644
--- a/src/include/ipxe/acpi.h
+++ b/src/include/ipxe/acpi.h
@@ -11,6 +11,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <ipxe/interface.h>
+#include <ipxe/uaccess.h>
 
 /**
  * An ACPI description header
@@ -51,6 +52,76 @@ struct acpi_description_header {
 #define ACPI_SIGNATURE( a, b, c, d ) \
 	( ( (a) << 0 ) | ( (b) << 8 ) | ( (c) << 16 ) | ( (d) << 24 ) )
 
+/** Root System Description Pointer signature */
+#define RSDP_SIGNATURE { 'R', 'S', 'D', ' ', 'P', 'T', 'R', ' ' }
+
+/** Root System Description Pointer */
+struct acpi_rsdp {
+	/** Signature */
+	char signature[8];
+	/** To make sum of entire table == 0 */
+	uint8_t checksum;
+	/** OEM identification */
+	char oem_id[6];
+	/** Revision */
+	uint8_t revision;
+	/** Physical address of RSDT */
+	uint32_t rsdt;
+} __attribute__ (( packed ));
+
+/** EBDA RSDP length */
+#define RSDP_EBDA_LEN 0x400
+
+/** Fixed BIOS area RSDP start address */
+#define RSDP_BIOS_START 0xe0000
+
+/** Fixed BIOS area RSDP length */
+#define RSDP_BIOS_LEN 0x20000
+
+/** Stride at which to search for RSDP */
+#define RSDP_STRIDE 16
+
+/** Root System Description Table (RSDT) signature */
+#define RSDT_SIGNATURE ACPI_SIGNATURE ( 'R', 'S', 'D', 'T' )
+
+/** ACPI Root System Description Table (RSDT) */
+struct acpi_rsdt {
+	/** ACPI header */
+	struct acpi_description_header acpi;
+	/** ACPI table entries */
+	uint32_t entry[0];
+} __attribute__ (( packed ));
+
+/** Fixed ACPI Description Table (FADT) signature */
+#define FADT_SIGNATURE ACPI_SIGNATURE ( 'F', 'A', 'C', 'P' )
+
+/** Fixed ACPI Description Table (FADT) */
+struct acpi_fadt {
+	/** ACPI header */
+	struct acpi_description_header acpi;
+	/** Physical address of FACS */
+	uint32_t facs;
+	/** Physical address of DSDT */
+	uint32_t dsdt;
+	/** Unused by iPXE */
+	uint8_t unused[20];
+	/** PM1a Control Register Block */
+	uint32_t pm1a_cnt_blk;
+	/** PM1b Control Register Block */
+	uint32_t pm1b_cnt_blk;
+} __attribute__ (( packed ));
+
+/** ACPI PM1 Control Register (within PM1a_CNT_BLK or PM1A_CNT_BLK) */
+#define ACPI_PM1_CNT 0
+#define ACPI_PM1_CNT_SLP_TYP(x) ( (x) << 10 )	/**< Sleep type */
+#define ACPI_PM1_CNT_SLP_EN ( 1 << 13 )		/**< Sleep enable */
+
+/** Differentiated System Description Table (DSDT) signature */
+#define DSDT_SIGNATURE ACPI_SIGNATURE ( 'D', 'S', 'D', 'T' )
+
+/** Secondary System Description Table (SSDT) signature */
+#define SSDT_SIGNATURE ACPI_SIGNATURE ( 'S', 'S', 'D', 'T' )
+
 extern int acpi_describe ( struct interface *interface,
 			   struct acpi_description_header *acpi, size_t len );
 #define acpi_describe_TYPE( object_type )				\
@@ -59,5 +130,9 @@ extern int acpi_describe ( struct interface *interface,
 		       size_t len ) )
 
 extern void acpi_fix_checksum ( struct acpi_description_header *acpi );
+extern userptr_t acpi_find_rsdt ( userptr_t ebda );
+extern userptr_t acpi_find ( userptr_t rsdt, uint32_t signature,
+			     unsigned int index );
+extern int acpi_sx ( userptr_t rsdt, uint32_t signature );
 
 #endif /* _IPXE_ACPI_H */