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authorGlauber de Oliveira Costa <gcosta@redhat.com>2008-01-30 13:31:14 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:31:14 +0100
commit507f90c9f92592e7630b1c1e87bf92d2c9858cc6 (patch)
tree23e011c11bc221e1c51702ca7dc748d2b241005d
parent54cd0eac7286b83ef1a657d2dddd74e0556209e7 (diff)
downloadop-kernel-dev-507f90c9f92592e7630b1c1e87bf92d2c9858cc6.zip
op-kernel-dev-507f90c9f92592e7630b1c1e87bf92d2c9858cc6.tar.gz
x86: move _set_gate and its users to a common location
This patch moves _set_gate and its users to desc.h. We can now use common code for x86_64 and i386. [ mingo@elte.hu: set_system_gate() fixes for nasty crashes. ] Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--arch/x86/kernel/traps_32.c34
-rw-r--r--include/asm-x86/desc.h92
-rw-r--r--include/asm-x86/desc_32.h16
-rw-r--r--include/asm-x86/desc_64.h45
-rw-r--r--include/asm-x86/desc_defs.h5
5 files changed, 93 insertions, 99 deletions
diff --git a/arch/x86/kernel/traps_32.c b/arch/x86/kernel/traps_32.c
index c70c41f..3065b3f 100644
--- a/arch/x86/kernel/traps_32.c
+++ b/arch/x86/kernel/traps_32.c
@@ -1102,40 +1102,6 @@ asmlinkage void math_emulate(long arg)
#endif /* CONFIG_MATH_EMULATION */
-/*
- * This needs to use 'idt_table' rather than 'idt', and
- * thus use the _nonmapped_ version of the IDT, as the
- * Pentium F0 0F bugfix can have resulted in the mapped
- * IDT being write-protected.
- */
-void set_intr_gate(unsigned int n, void *addr)
-{
- _set_gate(n, DESCTYPE_INT, addr, __KERNEL_CS);
-}
-
-/*
- * This routine sets up an interrupt gate at directory privilege level 3.
- */
-static inline void set_system_intr_gate(unsigned int n, void *addr)
-{
- _set_gate(n, DESCTYPE_INT | DESCTYPE_DPL3, addr, __KERNEL_CS);
-}
-
-static void __init set_trap_gate(unsigned int n, void *addr)
-{
- _set_gate(n, DESCTYPE_TRAP, addr, __KERNEL_CS);
-}
-
-static void __init set_system_gate(unsigned int n, void *addr)
-{
- _set_gate(n, DESCTYPE_TRAP | DESCTYPE_DPL3, addr, __KERNEL_CS);
-}
-
-static void __init set_task_gate(unsigned int n, unsigned int gdt_entry)
-{
- _set_gate(n, DESCTYPE_TASK, (void *)0, (gdt_entry<<3));
-}
-
void __init trap_init(void)
{
diff --git a/include/asm-x86/desc.h b/include/asm-x86/desc.h
index e61a5a3..d75bc06 100644
--- a/include/asm-x86/desc.h
+++ b/include/asm-x86/desc.h
@@ -33,6 +33,22 @@ 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)
+{
+ gate->offset_low = PTR_LOW(func);
+ gate->segment = __KERNEL_CS;
+ gate->ist = ist;
+ gate->p = 1;
+ gate->dpl = dpl;
+ gate->zero0 = 0;
+ gate->zero1 = 0;
+ gate->type = type;
+ gate->offset_middle = PTR_MIDDLE(func);
+ gate->offset_high = PTR_HIGH(func);
+}
+
#else
struct gdt_page {
struct desc_struct gdt[GDT_ENTRIES];
@@ -43,6 +59,16 @@ 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)
+
+{
+ gate->a = (seg << 16) | (base & 0xffff);
+ gate->b = (base & 0xffff0000) |
+ (((0x80 | type | (dpl << 5)) & 0xff) << 8);
+}
+
#endif
#ifdef CONFIG_PARAVIRT
@@ -242,6 +268,72 @@ static inline unsigned long get_desc_base(struct desc_struct *desc)
{
return desc->base0 | ((desc->base1) << 16) | ((desc->base2) << 24);
}
+static inline void _set_gate(int gate, unsigned type, void *addr,
+ unsigned dpl, unsigned ist, unsigned seg)
+{
+ gate_desc s;
+ pack_gate(&s, type, (unsigned long)addr, dpl, ist, seg);
+ /*
+ * does not need to be atomic because it is only done once at
+ * setup time
+ */
+ write_idt_entry(idt_table, gate, &s);
+}
+
+/*
+ * This needs to use 'idt_table' rather than 'idt', and
+ * thus use the _nonmapped_ version of the IDT, as the
+ * Pentium F0 0F bugfix can have resulted in the mapped
+ * IDT being write-protected.
+ */
+static inline void set_intr_gate(unsigned int n, void *addr)
+{
+ BUG_ON((unsigned)n > 0xFF);
+ _set_gate(n, GATE_INTERRUPT, addr, 0, 0, __KERNEL_CS);
+}
+
+/*
+ * This routine sets up an interrupt gate at directory privilege level 3.
+ */
+static inline void set_system_intr_gate(unsigned int n, void *addr)
+{
+ BUG_ON((unsigned)n > 0xFF);
+ _set_gate(n, GATE_INTERRUPT, addr, 0x3, 0, __KERNEL_CS);
+}
+
+static inline void set_trap_gate(unsigned int n, void *addr)
+{
+ BUG_ON((unsigned)n > 0xFF);
+ _set_gate(n, GATE_TRAP, addr, 0, 0, __KERNEL_CS);
+}
+
+static inline void set_system_gate(unsigned int n, void *addr)
+{
+ BUG_ON((unsigned)n > 0xFF);
+#ifdef CONFIG_X86_32
+ _set_gate(n, GATE_TRAP, addr, 0x3, 0, __KERNEL_CS);
+#else
+ _set_gate(n, GATE_INTERRUPT, addr, 0x3, 0, __KERNEL_CS);
+#endif
+}
+
+static inline void set_task_gate(unsigned int n, unsigned int gdt_entry)
+{
+ BUG_ON((unsigned)n > 0xFF);
+ _set_gate(n, GATE_TASK, (void *)0, 0, 0, (gdt_entry<<3));
+}
+
+static inline void set_intr_gate_ist(int n, void *addr, unsigned ist)
+{
+ BUG_ON((unsigned)n > 0xFF);
+ _set_gate(n, GATE_INTERRUPT, addr, 0, ist, __KERNEL_CS);
+}
+
+static inline void set_system_gate_ist(int n, void *addr, unsigned ist)
+{
+ BUG_ON((unsigned)n > 0xFF);
+ _set_gate(n, GATE_INTERRUPT, addr, 0x3, ist, __KERNEL_CS);
+}
#else
/*
diff --git a/include/asm-x86/desc_32.h b/include/asm-x86/desc_32.h
index 4bf20b7..3b112ec 100644
--- a/include/asm-x86/desc_32.h
+++ b/include/asm-x86/desc_32.h
@@ -10,22 +10,6 @@
#include <linux/preempt.h>
#include <linux/percpu.h>
-extern void set_intr_gate(unsigned int irq, void * addr);
-
-static inline void pack_gate(gate_desc *gate,
- unsigned long base, unsigned short seg, unsigned char type, unsigned char flags)
-{
- gate->a = (seg << 16) | (base & 0xffff);
- gate->b = (base & 0xffff0000) | ((type & 0xff) << 8) | (flags & 0xff);
-}
-
-static inline void _set_gate(int gate, unsigned int type, void *addr, unsigned short seg)
-{
- gate_desc g;
- pack_gate(&g, (unsigned long)addr, seg, type, 0);
- write_idt_entry(idt_table, gate, &g);
-}
-
static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, const void *addr)
{
tss_desc tss;
diff --git a/include/asm-x86/desc_64.h b/include/asm-x86/desc_64.h
index b0290c4..6bc92e6 100644
--- a/include/asm-x86/desc_64.h
+++ b/include/asm-x86/desc_64.h
@@ -11,51 +11,6 @@
#include <asm/segment.h>
-static inline void _set_gate(int gate, 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
- */
- write_idt_entry(idt_table, gate, &s);
-}
-
-static inline void set_intr_gate(int nr, void *func)
-{
- BUG_ON((unsigned)nr > 0xFF);
- _set_gate(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(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(nr, GATE_INTERRUPT, (unsigned long) func, 3, 0);
-}
-
-static inline void set_system_gate_ist(int nr, void *func, unsigned ist)
-{
- _set_gate(nr, GATE_INTERRUPT, (unsigned long) func, 3, ist);
-}
-
static inline void set_tss_desc(unsigned cpu, void *addr)
{
struct desc_struct *d = get_cpu_gdt_table(cpu);
diff --git a/include/asm-x86/desc_defs.h b/include/asm-x86/desc_defs.h
index ebb64fe..e33f078 100644
--- a/include/asm-x86/desc_defs.h
+++ b/include/asm-x86/desc_defs.h
@@ -36,6 +36,7 @@ enum {
GATE_INTERRUPT = 0xE,
GATE_TRAP = 0xF,
GATE_CALL = 0xC,
+ GATE_TASK = 0x5,
};
// 16byte gate
@@ -55,10 +56,6 @@ struct gate_struct64 {
enum {
DESC_TSS = 0x9,
DESC_LDT = 0x2,
- DESCTYPE_TASK = 0x85, /* present, system, DPL-0, task gate */
- DESCTYPE_INT = 0x8e, /* present, system, DPL-0, interrupt gate */
- DESCTYPE_TRAP = 0x8f, /* present, system, DPL-0, trap gate */
- DESCTYPE_DPL3 = 0x60, /* DPL-3 */
DESCTYPE_S = 0x10, /* !system */
};
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