Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 217 insertions, 0 deletions

diff --git a/include/asm-x86_64/desc.h b/include/asm-x86_64/desc.h
new file mode 100644
index 00000000000..6aefb9c0280
--- /dev/null
+++ b/include/asm-x86_64/desc.h
@@ -0,0 +1,217 @@
+/* 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 <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)) ;
+
+#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))
+#define clear_LDT()  asm volatile("lldt %w0"::"r" (0))
+
+/*
+ * This is the ldt that every process will get unless we need
+ * something other than this.
+ */
+extern struct desc_struct default_ldt[];
+extern struct gate_struct idt_table[]; 
+
+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); 
+	/* 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) 
+{ 
+	_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) 
+{ 
+	_set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 0, 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(void *ptr, unsigned long tss, unsigned type, 
+					 unsigned size) 
+{ 
+	struct ldttss_desc 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)
+{ 
+	set_tssldt_descriptor(&cpu_gdt_table[cpu][GDT_ENTRY_TSS], (unsigned long)addr, 
+			      DESC_TSS,
+			      sizeof(struct tss_struct) - 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, 
+			      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];
+	u32 addr = (u32)(u64)base;
+	BUG_ON((u64)base >> 32); 
+	d->base0 = addr & 0xffff;
+	d->base1 = (addr >> 16) & 0xff;
+	d->base2 = (addr >> 24) & 0xff;
+} 
+
+#define LDT_entry_a(info) \
+	((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
+/* Don't allow setting of the lm bit. It is useless anyways because 
+   64bit system calls require __USER_CS. */ 
+#define LDT_entry_b(info) \
+	(((info)->base_addr & 0xff000000) | \
+	(((info)->base_addr & 0x00ff0000) >> 16) | \
+	((info)->limit & 0xf0000) | \
+	(((info)->read_exec_only ^ 1) << 9) | \
+	((info)->contents << 10) | \
+	(((info)->seg_not_present ^ 1) << 15) | \
+	((info)->seg_32bit << 22) | \
+	((info)->limit_in_pages << 23) | \
+	((info)->useable << 20) | \
+	/* ((info)->lm << 21) | */ \
+	0x7000)
+
+#define LDT_empty(info) (\
+	(info)->base_addr	== 0	&& \
+	(info)->limit		== 0	&& \
+	(info)->contents	== 0	&& \
+	(info)->read_exec_only	== 1	&& \
+	(info)->seg_32bit	== 0	&& \
+	(info)->limit_in_pages	== 0	&& \
+	(info)->seg_not_present	== 1	&& \
+	(info)->useable		== 0	&& \
+	(info)->lm		== 0)
+
+#if TLS_SIZE != 24
+# error update this code.
+#endif
+
+static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
+{
+	u64 *gdt = (u64 *)(cpu_gdt_table[cpu] + GDT_ENTRY_TLS_MIN);
+	gdt[0] = t->tls_array[0];
+	gdt[1] = t->tls_array[1];
+	gdt[2] = t->tls_array[2];
+} 
+
+/*
+ * load one particular LDT into the current CPU
+ */
+extern inline void load_LDT_nolock (mm_context_t *pc, int cpu)
+{
+	int count = pc->size;
+
+	if (likely(!count)) {
+		clear_LDT();
+		return;
+	}
+		
+	set_ldt_desc(cpu, pc->ldt, count);
+	load_LDT_desc();
+}
+
+static inline void load_LDT(mm_context_t *pc)
+{
+	int cpu = get_cpu();
+	load_LDT_nolock(pc, cpu);
+	put_cpu();
+}
+
+extern struct desc_ptr idt_descr;
+
+#endif /* !__ASSEMBLY__ */
+
+#endif