diff options
| -rw-r--r-- | arch/x86/kernel/traps_32.c | 34 | ||||
| -rw-r--r-- | include/asm-x86/desc.h | 92 | ||||
| -rw-r--r-- | include/asm-x86/desc_32.h | 16 | ||||
| -rw-r--r-- | include/asm-x86/desc_64.h | 45 | ||||
| -rw-r--r-- | include/asm-x86/desc_defs.h | 5 |
5 files changed, 93 insertions, 99 deletions
diff --git a/arch/x86/kernel/traps_32.c b/arch/x86/kernel/traps_32.c index c70c41fd710b..3065b3f41928 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 e61a5a38caba..d75bc0634313 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 4bf20b7dd741..3b112ec186a0 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 b0290c45319c..6bc92e6e5cc3 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 ebb64fe3a450..e33f078b3e54 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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