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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>
This commit is contained in:
Glauber de Oliveira Costa 2008-01-30 13:31:14 +01:00 committed by Ingo Molnar
parent 54cd0eac72
commit 507f90c9f9
5 changed files with 93 additions and 99 deletions
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34
arch/x86/kernel/traps_32.c
View File

@ -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)
{

92
include/asm-x86/desc.h
View File

@ -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
/*

16
include/asm-x86/desc_32.h
View File

@ -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;

45
include/asm-x86/desc_64.h
View File

@ -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);

5
include/asm-x86/desc_defs.h
View File

@ -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 */
};