* incrementally. We keep the signature as a struct, rather than an union,
* so we can get rid of it transparently in the future -- glommer
*/
-// 8 byte segment descriptor
+/* 8 byte segment descriptor */
struct desc_struct {
union {
- struct { unsigned int a, b; };
+ struct {
+ unsigned int a;
+ unsigned int b;
+ };
struct {
u16 limit0;
u16 base0;
unsigned base1: 8, type: 4, s: 1, dpl: 2, p: 1;
unsigned limit: 4, avl: 1, l: 1, d: 1, g: 1, base2: 8;
};
-
};
} __attribute__((packed));
GATE_TASK = 0x5,
};
-// 16byte gate
+/* 16byte gate */
struct gate_struct64 {
u16 offset_low;
u16 segment;
enum {
DESC_TSS = 0x9,
DESC_LDT = 0x2,
- DESCTYPE_S = 0x10, /* !system */
+ DESCTYPE_S = 0x10, /* !system */
};
-// LDT or TSS descriptor in the GDT. 16 bytes.
+/* LDT or TSS descriptor in the GDT. 16 bytes. */
struct ldttss_desc64 {
u16 limit0;
u16 base0;
typedef struct gate_struct64 gate_desc;
typedef struct ldttss_desc64 ldt_desc;
typedef struct ldttss_desc64 tss_desc;
+#define gate_offset(g) ((g).offset_low | ((unsigned long)(g).offset_middle << 16) | ((unsigned long)(g).offset_high << 32))
+#define gate_segment(g) ((g).segment)
#else
typedef struct desc_struct gate_desc;
typedef struct desc_struct ldt_desc;
typedef struct desc_struct tss_desc;
+#define gate_offset(g) (((g).b & 0xffff0000) | ((g).a & 0x0000ffff))
+#define gate_segment(g) ((g).a >> 16)
#endif
struct desc_ptr {
unsigned long address;
} __attribute__((packed)) ;
-
#endif /* !__ASSEMBLY__ */
#endif