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    Subject[RFC PATCH 20/33] subarch support for interrupt and exception gates
    Abstract the code that sets up interrupt and exception gates, and
    add a separate subarch implementation for Xen.

    Signed-off-by: Ian Pratt <ian.pratt@xensource.com>
    Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
    Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    ---
    arch/i386/kernel/traps.c | 35 ++++++-----------------------
    include/asm-i386/mach-default/mach_idt.h | 24 +++++++++++++++++++
    include/asm-i386/mach-xen/mach_idt.h | 25 ++++++++++++++++++++
    include/asm-i386/mach-xen/setup_arch_pre.h | 2 +
    4 files changed, 59 insertions(+), 27 deletions(-)

    diff -r 29559215e367 arch/i386/kernel/traps.c
    --- a/arch/i386/kernel/traps.c Tue Jun 13 23:38:38 2006 -0700
    +++ b/arch/i386/kernel/traps.c Tue Jun 13 23:40:29 2006 -0700
    @@ -1084,29 +1084,11 @@ void __init trap_init_f00f_bug(void)
    }
    #endif

    -#define _set_gate(gate_addr,type,dpl,addr,seg) \
    -do { \
    - int __d0, __d1; \
    - __asm__ __volatile__ ("movw %%dx,%%ax\n\t" \
    - "movw %4,%%dx\n\t" \
    - "movl %%eax,%0\n\t" \
    - "movl %%edx,%1" \
    - :"=m" (*((long *) (gate_addr))), \
    - "=m" (*(1+(long *) (gate_addr))), "=&a" (__d0), "=&d" (__d1) \
    - :"i" ((short) (0x8000+(dpl<<13)+(type<<8))), \
    - "3" ((char *) (addr)),"2" ((seg) << 16)); \
    -} while (0)
    -
    -
    -/*
    - * 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.
    - */
    +#include <mach_idt.h>
    +
    void set_intr_gate(unsigned int n, void *addr)
    {
    - _set_gate(idt_table+n,14,0,addr,__KERNEL_CS);
    + _set_gate(n,14,0,addr,__KERNEL_CS);
    }

    /*
    @@ -1114,24 +1096,23 @@ void set_intr_gate(unsigned int n, void
    */
    static inline void set_system_intr_gate(unsigned int n, void *addr)
    {
    - _set_gate(idt_table+n, 14, 3, addr, __KERNEL_CS);
    + _set_gate(n, 14, 3, addr, __KERNEL_CS);
    }

    static void __init set_trap_gate(unsigned int n, void *addr)
    {
    - _set_gate(idt_table+n,15,0,addr,__KERNEL_CS);
    + _set_gate(n,15,0,addr,__KERNEL_CS);
    }

    static void __init set_system_gate(unsigned int n, void *addr)
    {
    - _set_gate(idt_table+n,15,3,addr,__KERNEL_CS);
    + _set_gate(n,15,3,addr,__KERNEL_CS);
    }

    static void __init set_task_gate(unsigned int n, unsigned int gdt_entry)
    {
    - _set_gate(idt_table+n,5,0,0,(gdt_entry<<3));
    -}
    -
    + _set_gate(n,5,0,0,(gdt_entry<<3));
    +}

    void __init trap_init(void)
    {
    diff -r 29559215e367 arch/i386/mach-xen/setup-xen.c
    --- a/arch/i386/mach-xen/setup-xen.c Tue Jun 13 23:38:38 2006 -0700
    +++ b/arch/i386/mach-xen/setup-xen.c Tue Jun 13 23:40:29 2006 -0700
    @@ -23,6 +23,8 @@ EXPORT_SYMBOL(xen_start_info);
    */
    struct shared_info *HYPERVISOR_shared_info = (struct shared_info *)empty_zero_page;
    EXPORT_SYMBOL(HYPERVISOR_shared_info);
    +
    +struct trap_info xen_trap_table[257];

    /**
    * machine_specific_memory_setup - Hook for machine specific memory setup.
    diff -r 29559215e367 include/asm-i386/mach-xen/setup_arch.h
    --- a/include/asm-i386/mach-xen/setup_arch.h Tue Jun 13 23:38:38 2006 -0700
    +++ b/include/asm-i386/mach-xen/setup_arch.h Tue Jun 13 23:40:29 2006 -0700
    @@ -3,6 +3,7 @@

    extern struct start_info *xen_start_info;
    extern struct shared_info *HYPERVISOR_shared_info;
    +extern struct trap_info xen_trap_table[257];

    void __init machine_specific_arch_setup(void);

    diff -r 29559215e367 include/asm-i386/mach-default/mach_idt.h
    --- /dev/null Thu Jan 01 00:00:00 1970 +0000
    +++ b/include/asm-i386/mach-default/mach_idt.h Tue Jun 13 23:40:29 2006 -0700
    @@ -0,0 +1,24 @@
    +#ifndef __ASM_MACH_IDT_H
    +#define __ASM_MACH_IDT_H
    +
    +/*
    + * 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.
    + */
    +#define _set_gate(vector,type,dpl,addr,seg) \
    +do { \
    + int __d0, __d1; \
    + struct gate_struct *__gate_addr = idt_table + (vector); \
    + __asm__ __volatile__ ("movw %%dx,%%ax\n\t" \
    + "movw %4,%%dx\n\t" \
    + "movl %%eax,%0\n\t" \
    + "movl %%edx,%1" \
    + :"=m" (*((long *) __gate_addr)), \
    + "=m" (*(1+(long *) __gate_addr)), "=&a" (__d0), "=&d" (__d1) \
    + :"i" ((short) (0x8000+(dpl<<13)+(type<<8))), \
    + "3" ((char *) (addr)),"2" ((seg) << 16)); \
    +} while (0)
    +
    +#endif /* __ASM_MACH_IDT_H */
    diff -r 29559215e367 include/asm-i386/mach-xen/mach_idt.h
    --- /dev/null Thu Jan 01 00:00:00 1970 +0000
    +++ b/include/asm-i386/mach-xen/mach_idt.h Tue Jun 13 23:40:29 2006 -0700
    @@ -0,0 +1,25 @@
    +#ifndef __ASM_MACH_IDT_H
    +#define __ASM_MACH_IDT_H
    +
    +static inline void _set_gate(unsigned int vector, uint8_t type, uint8_t dpl,
    + void *addr, uint16_t seg)
    +{
    + struct trap_info *t = xen_trap_table;
    +
    + BUG_ON(vector > 256);
    +
    + if (type == 5)
    + return;
    +
    + while (t->address && t->vector != vector)
    + t++;
    +
    + t->vector = vector;
    + t->cs = seg;
    + TI_SET_DPL(t, dpl);
    + if (type == 14 || vector == 7)
    + TI_SET_IF(t, 1);
    + t->address = (unsigned long)addr;
    +}
    +
    +#endif /* __ASM_MACH_IDT_H */
    --
    -
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