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-rw-r--r--include/asm-i386/desc.h95
1 files changed, 63 insertions, 32 deletions
diff --git a/include/asm-i386/desc.h b/include/asm-i386/desc.h
index 050831f34f7..c547403f341 100644
--- a/include/asm-i386/desc.h
+++ b/include/asm-i386/desc.h
@@ -12,23 +12,24 @@
#include <asm/mmu.h>
-extern struct desc_struct cpu_gdt_table[GDT_ENTRIES];
-
struct Xgt_desc_struct {
unsigned short size;
unsigned long address __attribute__((packed));
unsigned short pad;
} __attribute__ ((packed));
-extern struct Xgt_desc_struct idt_descr;
-DECLARE_PER_CPU(struct Xgt_desc_struct, cpu_gdt_descr);
-extern struct Xgt_desc_struct early_gdt_descr;
+struct gdt_page
+{
+ struct desc_struct gdt[GDT_ENTRIES];
+} __attribute__((aligned(PAGE_SIZE)));
+DECLARE_PER_CPU(struct gdt_page, gdt_page);
static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu)
{
- return (struct desc_struct *)per_cpu(cpu_gdt_descr, cpu).address;
+ return per_cpu(gdt_page, cpu).gdt;
}
+extern struct Xgt_desc_struct idt_descr;
extern struct desc_struct idt_table[];
extern void set_intr_gate(unsigned int irq, void * addr);
@@ -58,45 +59,33 @@ static inline void pack_gate(__u32 *a, __u32 *b,
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else
-#define load_TR_desc() __asm__ __volatile__("ltr %w0"::"q" (GDT_ENTRY_TSS*8))
-
-#define load_gdt(dtr) __asm__ __volatile("lgdt %0"::"m" (*dtr))
-#define load_idt(dtr) __asm__ __volatile("lidt %0"::"m" (*dtr))
+#define load_TR_desc() native_load_tr_desc()
+#define load_gdt(dtr) native_load_gdt(dtr)
+#define load_idt(dtr) native_load_idt(dtr)
#define load_tr(tr) __asm__ __volatile("ltr %0"::"m" (tr))
#define load_ldt(ldt) __asm__ __volatile("lldt %0"::"m" (ldt))
-#define store_gdt(dtr) __asm__ ("sgdt %0":"=m" (*dtr))
-#define store_idt(dtr) __asm__ ("sidt %0":"=m" (*dtr))
-#define store_tr(tr) __asm__ ("str %0":"=m" (tr))
+#define store_gdt(dtr) native_store_gdt(dtr)
+#define store_idt(dtr) native_store_idt(dtr)
+#define store_tr(tr) (tr = native_store_tr())
#define store_ldt(ldt) __asm__ ("sldt %0":"=m" (ldt))
-#if TLS_SIZE != 24
-# error update this code.
-#endif
-
-static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
-{
-#define C(i) get_cpu_gdt_table(cpu)[GDT_ENTRY_TLS_MIN + i] = t->tls_array[i]
- C(0); C(1); C(2);
-#undef C
-}
+#define load_TLS(t, cpu) native_load_tls(t, cpu)
+#define set_ldt native_set_ldt
#define write_ldt_entry(dt, entry, a, b) write_dt_entry(dt, entry, a, b)
#define write_gdt_entry(dt, entry, a, b) write_dt_entry(dt, entry, a, b)
#define write_idt_entry(dt, entry, a, b) write_dt_entry(dt, entry, a, b)
+#endif
-static inline void write_dt_entry(void *dt, int entry, __u32 entry_a, __u32 entry_b)
+static inline void write_dt_entry(struct desc_struct *dt,
+ int entry, u32 entry_low, u32 entry_high)
{
- __u32 *lp = (__u32 *)((char *)dt + entry*8);
- *lp = entry_a;
- *(lp+1) = entry_b;
+ dt[entry].a = entry_low;
+ dt[entry].b = entry_high;
}
-#define set_ldt native_set_ldt
-#endif /* CONFIG_PARAVIRT */
-
-static inline fastcall void native_set_ldt(const void *addr,
- unsigned int entries)
+static inline void native_set_ldt(const void *addr, unsigned int entries)
{
if (likely(entries == 0))
__asm__ __volatile__("lldt %w0"::"q" (0));
@@ -112,6 +101,48 @@ static inline fastcall void native_set_ldt(const void *addr,
}
}
+
+static inline void native_load_tr_desc(void)
+{
+ asm volatile("ltr %w0"::"q" (GDT_ENTRY_TSS*8));
+}
+
+static inline void native_load_gdt(const struct Xgt_desc_struct *dtr)
+{
+ asm volatile("lgdt %0"::"m" (*dtr));
+}
+
+static inline void native_load_idt(const struct Xgt_desc_struct *dtr)
+{
+ asm volatile("lidt %0"::"m" (*dtr));
+}
+
+static inline void native_store_gdt(struct Xgt_desc_struct *dtr)
+{
+ asm ("sgdt %0":"=m" (*dtr));
+}
+
+static inline void native_store_idt(struct Xgt_desc_struct *dtr)
+{
+ asm ("sidt %0":"=m" (*dtr));
+}
+
+static inline unsigned long native_store_tr(void)
+{
+ unsigned long tr;
+ asm ("str %0":"=r" (tr));
+ return tr;
+}
+
+static inline void native_load_tls(struct thread_struct *t, unsigned int cpu)
+{
+ unsigned int i;
+ struct desc_struct *gdt = get_cpu_gdt_table(cpu);
+
+ for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++)
+ gdt[GDT_ENTRY_TLS_MIN + i] = t->tls_array[i];
+}
+
static inline void _set_gate(int gate, unsigned int type, void *addr, unsigned short seg)
{
__u32 a, b;