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authorGlauber Costa <gcosta@redhat.com>2008-05-28 16:19:53 -0700
committerIngo Molnar <mingo@elte.hu>2008-07-08 12:48:16 +0200
commita939098afcfa5f81d3474782ec15c6d114e57763 (patch)
tree62c21fb10d6b58dc8247c34e68ab5562e045b8d0 /include
parent736f12bff9d9e7b4e895c64f73b190c8383fc2a1 (diff)
downloadblackbird-op-linux-a939098afcfa5f81d3474782ec15c6d114e57763.tar.gz
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x86: move x86_64 gdt closer to i386
i386 and x86_64 used two different schemes for maintaining the gdt. With this patch, x86_64 initial gdt table is defined in a .c file, same way as i386 is now. Also, we call it "gdt_page", and the descriptor, "early_gdt_descr". This way we achieve common naming, which can allow for more code integration. Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
-rw-r--r--include/asm-x86/desc.h24
-rw-r--r--include/asm-x86/segment.h23
2 files changed, 22 insertions, 25 deletions
diff --git a/include/asm-x86/desc.h b/include/asm-x86/desc.h
index b3875d4b4fab..07f9f2b17be8 100644
--- a/include/asm-x86/desc.h
+++ b/include/asm-x86/desc.h
@@ -29,11 +29,17 @@ static inline void fill_ldt(struct desc_struct *desc,
extern struct desc_ptr idt_descr;
extern gate_desc idt_table[];
+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 per_cpu(gdt_page, cpu).gdt;
+}
+
#ifdef CONFIG_X86_64
-extern struct desc_struct cpu_gdt_table[GDT_ENTRIES];
-extern struct desc_ptr cpu_gdt_descr[];
-/* the cpu gdt accessor */
-#define get_cpu_gdt_table(x) ((struct desc_struct *)cpu_gdt_descr[x].address)
static inline void pack_gate(gate_desc *gate, unsigned type, unsigned long func,
unsigned dpl, unsigned ist, unsigned seg)
@@ -51,16 +57,6 @@ static inline void pack_gate(gate_desc *gate, unsigned type, unsigned long func,
}
#else
-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 per_cpu(gdt_page, cpu).gdt;
-}
-
static inline void pack_gate(gate_desc *gate, unsigned char type,
unsigned long base, unsigned dpl, unsigned flags,
unsigned short seg)
diff --git a/include/asm-x86/segment.h b/include/asm-x86/segment.h
index ed5131dd7d92..dfc8601c0892 100644
--- a/include/asm-x86/segment.h
+++ b/include/asm-x86/segment.h
@@ -61,18 +61,14 @@
#define GDT_ENTRY_TLS_MAX (GDT_ENTRY_TLS_MIN + GDT_ENTRY_TLS_ENTRIES - 1)
#define GDT_ENTRY_DEFAULT_USER_CS 14
-#define __USER_CS (GDT_ENTRY_DEFAULT_USER_CS * 8 + 3)
#define GDT_ENTRY_DEFAULT_USER_DS 15
-#define __USER_DS (GDT_ENTRY_DEFAULT_USER_DS * 8 + 3)
#define GDT_ENTRY_KERNEL_BASE 12
#define GDT_ENTRY_KERNEL_CS (GDT_ENTRY_KERNEL_BASE + 0)
-#define __KERNEL_CS (GDT_ENTRY_KERNEL_CS * 8)
#define GDT_ENTRY_KERNEL_DS (GDT_ENTRY_KERNEL_BASE + 1)
-#define __KERNEL_DS (GDT_ENTRY_KERNEL_DS * 8)
#define GDT_ENTRY_TSS (GDT_ENTRY_KERNEL_BASE + 4)
#define GDT_ENTRY_LDT (GDT_ENTRY_KERNEL_BASE + 5)
@@ -139,10 +135,11 @@
#else
#include <asm/cache.h>
-#define __KERNEL_CS 0x10
-#define __KERNEL_DS 0x18
+#define GDT_ENTRY_KERNEL32_CS 1
+#define GDT_ENTRY_KERNEL_CS 2
+#define GDT_ENTRY_KERNEL_DS 3
-#define __KERNEL32_CS 0x08
+#define __KERNEL32_CS (GDT_ENTRY_KERNEL32_CS * 8)
/*
* we cannot use the same code segment descriptor for user and kernel
@@ -150,10 +147,10 @@
* The segment offset needs to contain a RPL. Grr. -AK
* GDT layout to get 64bit syscall right (sysret hardcodes gdt offsets)
*/
-
-#define __USER32_CS 0x23 /* 4*8+3 */
-#define __USER_DS 0x2b /* 5*8+3 */
-#define __USER_CS 0x33 /* 6*8+3 */
+#define GDT_ENTRY_DEFAULT_USER32_CS 4
+#define GDT_ENTRY_DEFAULT_USER_DS 5
+#define GDT_ENTRY_DEFAULT_USER_CS 6
+#define __USER32_CS (GDT_ENTRY_DEFAULT_USER32_CS * 8 + 3)
#define __USER32_DS __USER_DS
#define GDT_ENTRY_TSS 8 /* needs two entries */
@@ -175,6 +172,10 @@
#endif
+#define __KERNEL_CS (GDT_ENTRY_KERNEL_CS * 8)
+#define __KERNEL_DS (GDT_ENTRY_KERNEL_DS * 8)
+#define __USER_DS (GDT_ENTRY_DEFAULT_USER_DS* 8 + 3)
+#define __USER_CS (GDT_ENTRY_DEFAULT_USER_CS* 8 + 3)
#ifndef CONFIG_PARAVIRT
#define get_kernel_rpl() 0
#endif
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