#include <linux/string.h>
#include <linux/smp.h>
+#include <asm/desc_defs.h>
#include <asm/segment.h>
#include <asm/mmu.h>
-// 8 byte segment descriptor
-struct desc_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));
-
-struct n_desc_struct {
- unsigned int a,b;
-};
-
-extern struct desc_struct cpu_gdt_table[NR_CPUS][GDT_ENTRIES];
-
-enum {
- GATE_INTERRUPT = 0xE,
- GATE_TRAP = 0xF,
- GATE_CALL = 0xC,
-};
-
-// 16byte gate
-struct gate_struct {
- u16 offset_low;
- u16 segment;
- unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1;
- u16 offset_middle;
- u32 offset_high;
- u32 zero1;
-} __attribute__((packed));
-
-#define PTR_LOW(x) ((unsigned long)(x) & 0xFFFF)
-#define PTR_MIDDLE(x) (((unsigned long)(x) >> 16) & 0xFFFF)
-#define PTR_HIGH(x) ((unsigned long)(x) >> 32)
-
-enum {
- DESC_TSS = 0x9,
- DESC_LDT = 0x2,
-};
-
-// LDT or TSS descriptor in the GDT. 16 bytes.
-struct ldttss_desc {
- u16 limit0;
- u16 base0;
- unsigned base1 : 8, type : 5, dpl : 2, p : 1;
- unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8;
- u32 base3;
- u32 zero1;
-} __attribute__((packed));
-
-struct desc_ptr {
- unsigned short size;
- unsigned long address;
-} __attribute__((packed)) ;
+extern struct desc_struct cpu_gdt_table[GDT_ENTRIES];
#define load_TR_desc() asm volatile("ltr %w0"::"r" (GDT_ENTRY_TSS*8))
#define load_LDT_desc() asm volatile("lldt %w0"::"r" (GDT_ENTRY_LDT*8))
extern struct gate_struct idt_table[];
extern struct desc_ptr cpu_gdt_descr[];
+/* the cpu gdt accessor */
+#define cpu_gdt(_cpu) ((struct desc_struct *)cpu_gdt_descr[_cpu].address)
+
static inline void _set_gate(void *adr, unsigned type, unsigned long func, unsigned dpl, unsigned ist)
{
struct gate_struct s;
static inline void set_intr_gate(int nr, void *func)
{
+ BUG_ON((unsigned)nr > 0xFF);
_set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 0, 0);
}
static inline void set_intr_gate_ist(int nr, void *func, unsigned ist)
{
+ BUG_ON((unsigned)nr > 0xFF);
_set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 0, ist);
}
static inline void set_system_gate(int nr, void *func)
{
+ BUG_ON((unsigned)nr > 0xFF);
_set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, 0);
}
+static inline void set_system_gate_ist(int nr, void *func, unsigned ist)
+{
+ _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, ist);
+}
+
static inline void set_tssldt_descriptor(void *ptr, unsigned long tss, unsigned type,
unsigned size)
{
* -1? seg base+limit should be pointing to the address of the
* last valid byte
*/
- set_tssldt_descriptor(&cpu_gdt_table[cpu][GDT_ENTRY_TSS],
+ set_tssldt_descriptor(&cpu_gdt(cpu)[GDT_ENTRY_TSS],
(unsigned long)addr, DESC_TSS,
IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1);
}
static inline void set_ldt_desc(unsigned cpu, void *addr, int size)
{
- set_tssldt_descriptor(&cpu_gdt_table[cpu][GDT_ENTRY_LDT], (unsigned long)addr,
+ set_tssldt_descriptor(&cpu_gdt(cpu)[GDT_ENTRY_LDT], (unsigned long)addr,
DESC_LDT, size * 8 - 1);
}
static inline void set_seg_base(unsigned cpu, int entry, void *base)
{
- struct desc_struct *d = &cpu_gdt_table[cpu][entry];
+ struct desc_struct *d = &cpu_gdt(cpu)[entry];
u32 addr = (u32)(u64)base;
BUG_ON((u64)base >> 32);
d->base0 = addr & 0xffff;
static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
{
- u64 *gdt = (u64 *)(cpu_gdt_table[cpu] + GDT_ENTRY_TLS_MIN);
+ u64 *gdt = (u64 *)(cpu_gdt(cpu) + GDT_ENTRY_TLS_MIN);
gdt[0] = t->tls_array[0];
gdt[1] = t->tls_array[1];
gdt[2] = t->tls_array[2];