patch-2.4.20 linux-2.4.20/include/asm-x86_64/desc.h
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- Lines: 159
- Date:
Thu Nov 28 15:53:15 2002
- Orig file:
linux-2.4.19/include/asm-x86_64/desc.h
- Orig date:
Wed Dec 31 16:00:00 1969
diff -urN linux-2.4.19/include/asm-x86_64/desc.h linux-2.4.20/include/asm-x86_64/desc.h
@@ -0,0 +1,158 @@
+/* Written 2000 by Andi Kleen */
+#ifndef __ARCH_DESC_H
+#define __ARCH_DESC_H
+
+#include <linux/threads.h>
+#include <asm/ldt.h>
+
+#ifndef __ASSEMBLY__
+
+#define __TSS_INDEX(n) ((n)*64)
+#define __LDT_INDEX(n) ((n)*64)
+
+extern __u8 gdt_table[];
+extern __u8 gdt_end[];
+
+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));
+
+// 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));
+
+// 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 per_cpu_gdt {
+ struct ldttss_desc tss;
+ struct ldttss_desc ldt;
+} ____cacheline_aligned;
+
+extern struct per_cpu_gdt gdt_cpu_table[];
+
+#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,
+};
+
+struct desc_ptr {
+ unsigned short size;
+ unsigned long address;
+} __attribute__((packed)) ;
+
+#define __GDT_HEAD_SIZE 64
+#define __CPU_DESC_INDEX(x,field) \
+ ((x) * sizeof(struct per_cpu_gdt) + offsetof(struct per_cpu_gdt, field) + __GDT_HEAD_SIZE)
+
+#define load_TR(cpu) asm volatile("ltr %w0"::"r" (__CPU_DESC_INDEX(cpu, tss)));
+#define __load_LDT(cpu) asm volatile("lldt %w0"::"r" (__CPU_DESC_INDEX(cpu, ldt)));
+#define clear_LDT(n) asm volatile("lldt %w0"::"r" (0))
+
+extern struct gate_struct idt_table[];
+
+#define copy_16byte(dst,src) memcpy((dst), (src), 16)
+
+static inline void _set_gate(void *adr, unsigned type, unsigned long func, unsigned dpl, unsigned ist)
+{
+ struct gate_struct 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);
+ copy_16byte(adr, &s);
+}
+
+static inline void set_intr_gate(int nr, void *func)
+{
+ _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, 0);
+}
+
+static inline void set_intr_gate_ist(int nr, void *func, unsigned ist)
+{
+ _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, ist);
+}
+
+static inline void set_system_gate(int nr, void *func)
+{
+ _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, 0);
+}
+
+static inline void set_tssldt_descriptor(struct ldttss_desc *dst, unsigned long ptr, unsigned type,
+ unsigned size)
+{
+ memset(dst,0,16);
+ dst->limit0 = size & 0xFFFF;
+ dst->base0 = PTR_LOW(ptr);
+ dst->base1 = PTR_MIDDLE(ptr) & 0xFF;
+ dst->type = type;
+ dst->p = 1;
+ dst->limit1 = 0xF;
+ dst->base2 = (PTR_MIDDLE(ptr) >> 8) & 0xFF;
+ dst->base3 = PTR_HIGH(ptr);
+}
+
+static inline void set_tss_desc(unsigned n, void *addr)
+{
+ set_tssldt_descriptor((void *)&gdt_table + __CPU_DESC_INDEX(n,tss), (unsigned long)addr, DESC_TSS, sizeof(struct tss_struct));
+}
+
+static inline void set_ldt_desc(unsigned n, void *addr, int size)
+{
+ set_tssldt_descriptor((void *)&gdt_table + __CPU_DESC_INDEX(n,ldt), (unsigned long)addr, DESC_LDT, size);
+}
+
+/*
+ * load one particular LDT into the current CPU
+ */
+static inline void load_LDT (struct mm_struct *mm)
+{
+ int cpu = smp_processor_id();
+ void *segments = mm->context.segments;
+
+ if (!segments) {
+ clear_LDT(cpu);
+ return;
+ }
+
+ set_ldt_desc(cpu, segments, LDT_ENTRIES);
+ __load_LDT(cpu);
+}
+
+#endif /* !__ASSEMBLY__ */
+
+#endif
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