[Xen-merge] [PATCH 03/23] descriptor table subarch headers

[Chris Wright <chrisw@xxxxxxxx>]

===================================================================
--- linux-2.6.12-xen0-arch.orig/include/asm-i386/desc.h
+++ linux-2.6.12-xen0-arch/include/asm-i386/desc.h
@@ -14,9 +14,6 @@
 
 #include <asm/mmu.h>
 
-extern struct desc_struct cpu_gdt_table[GDT_ENTRIES];
-DECLARE_PER_CPU(struct desc_struct, cpu_gdt_table[GDT_ENTRIES]);
-
 DECLARE_PER_CPU(unsigned char, cpu_16bit_stack[CPU_16BIT_STACK_SIZE]);
 
 struct Xgt_desc_struct {
@@ -48,19 +45,16 @@ __asm__ __volatile__ ("movw %w3,0(%2)\n\
        "rorl $16,%%eax" \
        : "=m"(*(n)) : "a" (addr), "r"(n), "ir"(limit), "i"(type))
 
+#include <mach_desc.h>
+
 static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, void 
*addr)
 {
-       _set_tssldt_desc(&per_cpu(cpu_gdt_table, cpu)[entry], (int)addr,
+       _set_tssldt_desc(&get_cpu_gdt_table(cpu)[entry], (int)addr,
                offsetof(struct tss_struct, __cacheline_filler) - 1, 0x89);
 }
 
 #define set_tss_desc(cpu,addr) __set_tss_desc(cpu, GDT_ENTRY_TSS, addr)
 
-static inline void set_ldt_desc(unsigned int cpu, void *addr, unsigned int 
size)
-{
-       _set_tssldt_desc(&per_cpu(cpu_gdt_table, cpu)[GDT_ENTRY_LDT], 
(int)addr, ((size << 3)-1), 0x82);
-}
-
 #define LDT_entry_a(info) \
        ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
 
@@ -90,39 +84,6 @@ static inline void set_ldt_desc(unsigned
 # error update this code.
 #endif
 
-static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
-{
-#define C(i) per_cpu(cpu_gdt_table, cpu)[GDT_ENTRY_TLS_MIN + i] = 
t->tls_array[i]
-       C(0); C(1); C(2);
-#undef C
-}
-
-static inline void clear_LDT(void)
-{
-       int cpu = get_cpu();
-
-       set_ldt_desc(cpu, &default_ldt[0], 5);
-       load_LDT_desc();
-       put_cpu();
-}
-
-/*
- * load one particular LDT into the current CPU
- */
-static inline void load_LDT_nolock(mm_context_t *pc, int cpu)
-{
-       void *segments = pc->ldt;
-       int count = pc->size;
-
-       if (likely(!count)) {
-               segments = &default_ldt[0];
-               count = 5;
-       }
-               
-       set_ldt_desc(cpu, segments, count);
-       load_LDT_desc();
-}
-
 static inline void load_LDT(mm_context_t *pc)
 {
        int cpu = get_cpu();
Index: linux-2.6.12-xen0-arch/include/asm-i386/mach-default/mach_desc.h
===================================================================
--- /dev/null
+++ linux-2.6.12-xen0-arch/include/asm-i386/mach-default/mach_desc.h
@@ -0,0 +1,46 @@
+#ifndef __ASM_MACH_DESC_H
+#define __ASM_MACH_DESC_H
+
+extern struct desc_struct cpu_gdt_table[GDT_ENTRIES];
+DECLARE_PER_CPU(struct desc_struct, cpu_gdt_table[GDT_ENTRIES]);
+#define get_cpu_gdt_table(_cpu) per_cpu(cpu_gdt_table, cpu)
+
+static inline void set_ldt_desc(unsigned int cpu, void *addr, unsigned int 
size)
+{
+       _set_tssldt_desc(&get_cpu_gdt_table(cpu)[GDT_ENTRY_LDT], (int)addr, 
((size << 3)-1), 0x82);
+}
+
+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
+}
+
+static inline void clear_LDT(void)
+{
+       int cpu = get_cpu();
+
+       set_ldt_desc(cpu, &default_ldt[0], 5);
+       load_LDT_desc();
+       put_cpu();
+}
+
+/*
+ * load one particular LDT into the current CPU
+ */
+static inline void load_LDT_nolock(mm_context_t *pc, int cpu)
+{
+       void *segments = pc->ldt;
+       int count = pc->size;
+
+       if (likely(!count)) {
+               segments = &default_ldt[0];
+               count = 5;
+       }
+               
+       set_ldt_desc(cpu, segments, count);
+       load_LDT_desc();
+}
+
+#endif
Index: linux-2.6.12-xen0-arch/include/asm-i386/mach-xen/mach_desc.h
===================================================================
--- /dev/null
+++ linux-2.6.12-xen0-arch/include/asm-i386/mach-xen/mach_desc.h
@@ -0,0 +1,46 @@
+#ifndef __ASM_MACH_DESC_H
+#define __ASM_MACH_DESC_H
+
+extern struct desc_struct cpu_gdt_table[NR_CPUS][GDT_ENTRIES];
+#define get_cpu_gdt_table(_cpu) ((struct desc_struct 
*)cpu_gdt_descr[(_cpu)].address)
+
+static inline void set_ldt_desc(unsigned int cpu, void *addr, unsigned int 
size)
+{
+       _set_tssldt_desc(&get_cpu_gdt_table(cpu)[GDT_ENTRY_LDT], (int)addr, 
((size << 3)-1), 0x82);
+}
+
+static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
+{
+#define C(i) 
HYPERVISOR_update_descriptor(virt_to_machine(&get_cpu_gdt_table(cpu)[GDT_ENTRY_TLS_MIN
 + i]), ((u32 *)&t->tls_array[i])[0], ((u32 *)&t->tls_array[i])[1])
+       C(0); C(1); C(2);
+#undef C
+}
+
+static inline void clear_LDT(void)
+{
+       int cpu = get_cpu();
+
+       /*
+        * NB. We load the default_ldt for lcall7/27 handling on demand, as
+        * it slows down context switching. Noone uses it anyway.
+        */
+       cpu = cpu;              /* XXX avoid compiler warning */
+       xen_set_ldt(0UL, 0);
+       put_cpu();
+}
+
+/*
+ * load one particular LDT into the current CPU
+ */
+static inline void load_LDT_nolock(mm_context_t *pc, int cpu)
+{
+       void *segments = pc->ldt;
+       int count = pc->size;
+
+       if (likely(!count))
+               segments = NULL;
+
+       xen_set_ldt((unsigned long)segments, count);
+}
+
+#endif

--


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