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-rw-r--r--include/acpi/actbl1.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
index 556c83ee6b42..4ec8c194bfe5 100644
--- a/include/acpi/actbl1.h
+++ b/include/acpi/actbl1.h
@@ -457,7 +457,7 @@ struct acpi_hest_aer_common {
u8 enabled;
u32 records_to_preallocate;
u32 max_sections_per_record;
- u32 bus;
+ u32 bus; /* Bus and Segment numbers */
u16 device;
u16 function;
u16 device_control;
@@ -473,6 +473,14 @@ struct acpi_hest_aer_common {
#define ACPI_HEST_FIRMWARE_FIRST (1)
#define ACPI_HEST_GLOBAL (1<<1)
+/*
+ * Macros to access the bus/segment numbers in Bus field above:
+ * Bus number is encoded in bits 7:0
+ * Segment number is encoded in bits 23:8
+ */
+#define ACPI_HEST_BUS(bus) ((bus) & 0xFF)
+#define ACPI_HEST_SEGMENT(bus) (((bus) >> 8) & 0xFFFF)
+
/* Hardware Error Notification */
struct acpi_hest_notify {