#pragma pack(1)
/*
- * Note about bitfields: The u8 type is used for bitfields in ACPI tables.
- * This is the only type that is even remotely portable. Anything else is not
- * portable, so do not use any other bitfield types.
+ * Note: C bitfields are not used for this reason:
+ *
+ * "Bitfields are great and easy to read, but unfortunately the C language
+ * does not specify the layout of bitfields in memory, which means they are
+ * essentially useless for dealing with packed data in on-disk formats or
+ * binary wire protocols." (Or ACPI tables and buffers.) "If you ask me,
+ * this decision was a design error in C. Ritchie could have picked an order
+ * and stuck with it." Norman Ramsey.
+ * See http://stackoverflow.com/a/1053662/41661
*/
/*******************************************************************************
struct acpi_table_header {
char signature[ACPI_NAME_SIZE]; /* ASCII table signature */
u32 length; /* Length of table in bytes, including this header */
- u8 revision; /* ACPI Specification minor version # */
+ u8 revision; /* ACPI Specification minor version number */
u8 checksum; /* To make sum of entire table == 0 */
char oem_id[ACPI_OEM_ID_SIZE]; /* ASCII OEM identification */
char oem_table_id[ACPI_OEM_TABLE_ID_SIZE]; /* ASCII OEM table identification */
* GAS - Generic Address Structure (ACPI 2.0+)
*
* Note: Since this structure is used in the ACPI tables, it is byte aligned.
- * If misaliged access is not supported by the hardware, accesses to the
+ * If misaligned access is not supported by the hardware, accesses to the
* 64-bit Address field must be performed with care.
*
******************************************************************************/
u8 preferred_profile; /* Conveys preferred power management profile to OSPM. */
u16 sci_interrupt; /* System vector of SCI interrupt */
u32 smi_command; /* 32-bit Port address of SMI command port */
- u8 acpi_enable; /* Value to write to smi_cmd to enable ACPI */
- u8 acpi_disable; /* Value to write to smi_cmd to disable ACPI */
- u8 s4_bios_request; /* Value to write to SMI CMD to enter S4BIOS state */
+ u8 acpi_enable; /* Value to write to SMI_CMD to enable ACPI */
+ u8 acpi_disable; /* Value to write to SMI_CMD to disable ACPI */
+ u8 s4_bios_request; /* Value to write to SMI_CMD to enter S4BIOS state */
u8 pstate_control; /* Processor performance state control */
- u32 pm1a_event_block; /* 32-bit Port address of Power Mgt 1a Event Reg Blk */
- u32 pm1b_event_block; /* 32-bit Port address of Power Mgt 1b Event Reg Blk */
- u32 pm1a_control_block; /* 32-bit Port address of Power Mgt 1a Control Reg Blk */
- u32 pm1b_control_block; /* 32-bit Port address of Power Mgt 1b Control Reg Blk */
- u32 pm2_control_block; /* 32-bit Port address of Power Mgt 2 Control Reg Blk */
- u32 pm_timer_block; /* 32-bit Port address of Power Mgt Timer Ctrl Reg Blk */
- u32 gpe0_block; /* 32-bit Port address of General Purpose Event 0 Reg Blk */
- u32 gpe1_block; /* 32-bit Port address of General Purpose Event 1 Reg Blk */
+ u32 pm1a_event_block; /* 32-bit port address of Power Mgt 1a Event Reg Blk */
+ u32 pm1b_event_block; /* 32-bit port address of Power Mgt 1b Event Reg Blk */
+ u32 pm1a_control_block; /* 32-bit port address of Power Mgt 1a Control Reg Blk */
+ u32 pm1b_control_block; /* 32-bit port address of Power Mgt 1b Control Reg Blk */
+ u32 pm2_control_block; /* 32-bit port address of Power Mgt 2 Control Reg Blk */
+ u32 pm_timer_block; /* 32-bit port address of Power Mgt Timer Ctrl Reg Blk */
+ u32 gpe0_block; /* 32-bit port address of General Purpose Event 0 Reg Blk */
+ u32 gpe1_block; /* 32-bit port address of General Purpose Event 1 Reg Blk */
u8 pm1_event_length; /* Byte Length of ports at pm1x_event_block */
u8 pm1_control_length; /* Byte Length of ports at pm1x_control_block */
u8 pm2_control_length; /* Byte Length of ports at pm2_control_block */
u8 gpe0_block_length; /* Byte Length of ports at gpe0_block */
u8 gpe1_block_length; /* Byte Length of ports at gpe1_block */
u8 gpe1_base; /* Offset in GPE number space where GPE1 events start */
- u8 cst_control; /* Support for the _CST object and C States change notification */
+ u8 cst_control; /* Support for the _CST object and C-States change notification */
u16 c2_latency; /* Worst case HW latency to enter/exit C2 state */
u16 c3_latency; /* Worst case HW latency to enter/exit C3 state */
- u16 flush_size; /* Processor's memory cache line width, in bytes */
+ u16 flush_size; /* Processor memory cache line width, in bytes */
u16 flush_stride; /* Number of flush strides that need to be read */
- u8 duty_offset; /* Processor duty cycle index in processor's P_CNT reg */
+ u8 duty_offset; /* Processor duty cycle index in processor P_CNT reg */
u8 duty_width; /* Processor duty cycle value bit width in P_CNT register */
u8 day_alarm; /* Index to day-of-month alarm in RTC CMOS RAM */
u8 month_alarm; /* Index to month-of-year alarm in RTC CMOS RAM */
struct acpi_generic_address xpm_timer_block; /* 64-bit Extended Power Mgt Timer Ctrl Reg Blk address */
struct acpi_generic_address xgpe0_block; /* 64-bit Extended General Purpose Event 0 Reg Blk address */
struct acpi_generic_address xgpe1_block; /* 64-bit Extended General Purpose Event 1 Reg Blk address */
- struct acpi_generic_address sleep_control; /* 64-bit Sleep Control register */
- struct acpi_generic_address sleep_status; /* 64-bit Sleep Status register */
+ struct acpi_generic_address sleep_control; /* 64-bit Sleep Control register (ACPI 5.0) */
+ struct acpi_generic_address sleep_status; /* 64-bit Sleep Status register (ACPI 5.0) */
};
-/* Masks for FADT Boot Architecture Flags (boot_flags) */
+/* Masks for FADT Boot Architecture Flags (boot_flags) [Vx]=Introduced in this FADT revision */
#define ACPI_FADT_LEGACY_DEVICES (1) /* 00: [V2] System has LPC or ISA bus devices */
#define ACPI_FADT_8042 (1<<1) /* 01: [V3] System has an 8042 controller on port 60/64 */
/* Masks for FADT flags */
-#define ACPI_FADT_WBINVD (1) /* 00: [V1] The wbinvd instruction works properly */
-#define ACPI_FADT_WBINVD_FLUSH (1<<1) /* 01: [V1] wbinvd flushes but does not invalidate caches */
+#define ACPI_FADT_WBINVD (1) /* 00: [V1] The WBINVD instruction works properly */
+#define ACPI_FADT_WBINVD_FLUSH (1<<1) /* 01: [V1] WBINVD flushes but does not invalidate caches */
#define ACPI_FADT_C1_SUPPORTED (1<<2) /* 02: [V1] All processors support C1 state */
#define ACPI_FADT_C2_MP_SUPPORTED (1<<3) /* 03: [V1] C2 state works on MP system */
#define ACPI_FADT_POWER_BUTTON (1<<4) /* 04: [V1] Power button is handled as a control method device */
#define ACPI_FADT_SLEEP_BUTTON (1<<5) /* 05: [V1] Sleep button is handled as a control method device */
-#define ACPI_FADT_FIXED_RTC (1<<6) /* 06: [V1] RTC wakeup status not in fixed register space */
+#define ACPI_FADT_FIXED_RTC (1<<6) /* 06: [V1] RTC wakeup status is not in fixed register space */
#define ACPI_FADT_S4_RTC_WAKE (1<<7) /* 07: [V1] RTC alarm can wake system from S4 */
#define ACPI_FADT_32BIT_TIMER (1<<8) /* 08: [V1] ACPI timer width is 32-bit (0=24-bit) */
#define ACPI_FADT_DOCKING_SUPPORTED (1<<9) /* 09: [V1] Docking supported */
/* Values for preferred_profile (Preferred Power Management Profiles) */
-enum acpi_prefered_pm_profiles {
+enum acpi_preferred_pm_profiles {
PM_UNSPECIFIED = 0,
PM_DESKTOP = 1,
PM_MOBILE = 2,
struct acpi_table_desc {
acpi_physical_address address;
struct acpi_table_header *pointer;
- u32 length; /* Length fixed at 32 bits */
+ u32 length; /* Length fixed at 32 bits (fixed in table header) */
union acpi_name_union signature;
acpi_owner_id owner_id;
u8 flags;
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