[PATCH 4/5] x86: Add definition for 64 bit Segment descriptor

[Arbel Moshe <arbel.moshe@oracle.com>]

Signed-off-by: Arbel Moshe <arbel.moshe@oracle.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 lib/x86/desc.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/lib/x86/desc.h b/lib/x86/desc.h
index 3bf8fbe..181b59e 100644
--- a/lib/x86/desc.h
+++ b/lib/x86/desc.h
@@ -167,6 +167,31 @@ typedef struct {
 	u8 base_high;
 } gdt_entry_t;
 
+struct segment_desc64 {
+	uint16_t limit1;
+	uint16_t base1;
+	uint8_t  base2;
+	union {
+		uint16_t  type_limit_flags;      /* Type and limit flags */
+		struct {
+			uint16_t type:4;
+			uint16_t s:1;
+			uint16_t dpl:2;
+			uint16_t p:1;
+			uint16_t limit:4;
+			uint16_t avl:1;
+			uint16_t l:1;
+			uint16_t db:1;
+			uint16_t g:1;
+		} __attribute__((__packed__));
+	} __attribute__((__packed__));
+	uint8_t  base3;
+	uint32_t base4;
+	uint32_t zero;
+} __attribute__((__packed__));
+
+#define DESC_BUSY ((uint64_t) 1 << 41)
+
 extern idt_entry_t boot_idt[256];
 
 #ifndef __x86_64__
-- 
2.14.1