-/* Written 2000 by Andi Kleen */
-#ifndef __ARCH_DESC_H
-#define __ARCH_DESC_H
-#include <linux/threads.h>
-#include <asm/ldt.h>
-
-#ifndef __ASSEMBLY__
-
-#include <linux/string.h>
-#include <linux/smp.h>
-
-#include <asm/segment.h>
-
-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))
-
-static inline unsigned long __store_tr(void)
-{
- unsigned long tr;
-
- asm volatile ("str %w0":"=r" (tr));
- return tr;
-}
-
-#define store_tr(tr) (tr) = __store_tr()
-
-extern struct desc_ptr cpu_gdt_descr[];
-
-static inline void write_ldt_entry(struct desc_struct *ldt,
- int entry, void *ptr)
-{
- memcpy(&ldt[entry], ptr, 8);
-}
-
-/* the cpu gdt accessor */
-#define get_cpu_gdt_table(x) ((struct desc_struct *)cpu_gdt_descr[x].address)
-
-static inline void load_gdt(const struct desc_ptr *ptr)
-{
- asm volatile("lgdt %w0"::"m" (*ptr));
-}
-
-static inline void store_gdt(struct desc_ptr *ptr)
-{
- asm("sgdt %w0":"=m" (*ptr));
-}
-
-static inline void _set_gate(void *adr, unsigned type, unsigned long func,
- unsigned dpl, unsigned ist)
-{
- gate_desc s;
-
- s.offset_low = PTR_LOW(func);
- s.segment = __KERNEL_CS;
- s.ist = ist;
- s.p = 1;
- s.dpl = dpl;
- s.zero0 = 0;
- s.zero1 = 0;
- s.type = type;
- s.offset_middle = PTR_MIDDLE(func);
- s.offset_high = PTR_HIGH(func);
- /*
- * does not need to be atomic because it is only done once at
- * setup time
- */
- memcpy(adr, &s, 16);
-}
-
-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 load_idt(const struct desc_ptr *ptr)
-{
- asm volatile("lidt %w0"::"m" (*ptr));
-}
-
-static inline void store_idt(struct desc_ptr *dtr)
-{
- asm("sidt %w0":"=m" (*dtr));
-}
-
-static inline void set_tssldt_descriptor(void *ptr, unsigned long tss,
- unsigned type, unsigned size)
-{
- struct ldttss_desc64 d;
-
- memset(&d, 0, sizeof(d));
- d.limit0 = size & 0xFFFF;
- d.base0 = PTR_LOW(tss);
- d.base1 = PTR_MIDDLE(tss) & 0xFF;
- d.type = type;
- d.p = 1;
- d.limit1 = (size >> 16) & 0xF;
- d.base2 = (PTR_MIDDLE(tss) >> 8) & 0xFF;
- d.base3 = PTR_HIGH(tss);
- memcpy(ptr, &d, 16);
-}
-
-static inline void set_tss_desc(unsigned cpu, void *addr)
-{
- /*
- * sizeof(unsigned long) coming from an extra "long" at the end
- * of the iobitmap. See tss_struct definition in processor.h
- *
- * -1? seg base+limit should be pointing to the address of the
- * last valid byte
- */
- set_tssldt_descriptor(&get_cpu_gdt_table(cpu)[GDT_ENTRY_TSS],
- (unsigned long)addr, DESC_TSS,
- IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1);
-}
-
-static inline void set_ldt(void *addr, int entries)
-{
- if (likely(entries == 0))
- __asm__ __volatile__("lldt %w0"::"q" (0));
- else {
- unsigned cpu = smp_processor_id();
-
- set_tssldt_descriptor(&get_cpu_gdt_table(cpu)[GDT_ENTRY_LDT],
- (unsigned long)addr, DESC_LDT, entries * 8 - 1);
- __asm__ __volatile__("lldt %w0"::"q" (GDT_ENTRY_LDT*8));
- }
-}
-
-static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
-{
- unsigned int i;
- struct desc_struct *gdt = (get_cpu_gdt_table(cpu) + GDT_ENTRY_TLS_MIN);
-
- for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++)
- gdt[i] = t->tls_array[i];
-}
-
-#endif /* !__ASSEMBLY__ */
-
-#endif