diff options
| author | Rusty Russell <rusty@rustcorp.com.au> | 2007-05-02 19:27:13 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 19:27:13 +0200 |
| commit | a75c54f933bd8db9f4a609bd128663c179b3e6a1 (patch) | |
| tree | 8b7dd866185bec34146eb537f057b6b496c78443 /include/asm-i386/processor.h | |
| parent | 82d1bb725e128c97b362a4b33fcbfff08fdaaa5a (diff) | |
[PATCH] i386: i386 separate hardware-defined TSS from Linux additions
On Thu, 2007-03-29 at 13:16 +0200, Andi Kleen wrote:
> Please clean it up properly with two structs.
Not sure about this, now I've done it. Running it here.
If you like it, I can do x86-64 as well.
==
lguest defines its own TSS struct because the "struct tss_struct"
contains linux-specific additions. Andi asked me to split the struct
in processor.h.
Unfortunately it makes usage a little awkward.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'include/asm-i386/processor.h')
| -rw-r--r-- | include/asm-i386/processor.h | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h index 77e263267aa6..922260474646 100644 --- a/include/asm-i386/processor.h +++ b/include/asm-i386/processor.h @@ -291,7 +291,8 @@ typedef struct { struct thread_struct; -struct tss_struct { +/* This is the TSS defined by the hardware. */ +struct i386_hw_tss { unsigned short back_link,__blh; unsigned long esp0; unsigned short ss0,__ss0h; @@ -315,6 +316,11 @@ struct tss_struct { unsigned short gs, __gsh; unsigned short ldt, __ldth; unsigned short trace, io_bitmap_base; +} __attribute__((packed)); + +struct tss_struct { + struct i386_hw_tss x86_tss; + /* * The extra 1 is there because the CPU will access an * additional byte beyond the end of the IO permission @@ -381,10 +387,12 @@ struct thread_struct { * be within the limit. */ #define INIT_TSS { \ - .esp0 = sizeof(init_stack) + (long)&init_stack, \ - .ss0 = __KERNEL_DS, \ - .ss1 = __KERNEL_CS, \ - .io_bitmap_base = INVALID_IO_BITMAP_OFFSET, \ + .x86_tss = { \ + .esp0 = sizeof(init_stack) + (long)&init_stack, \ + .ss0 = __KERNEL_DS, \ + .ss1 = __KERNEL_CS, \ + .io_bitmap_base = INVALID_IO_BITMAP_OFFSET, \ + }, \ .io_bitmap = { [ 0 ... IO_BITMAP_LONGS] = ~0 }, \ } @@ -493,10 +501,10 @@ static inline void rep_nop(void) static inline void native_load_esp0(struct tss_struct *tss, struct thread_struct *thread) { - tss->esp0 = thread->esp0; + tss->x86_tss.esp0 = thread->esp0; /* This can only happen when SEP is enabled, no need to test "SEP"arately */ - if (unlikely(tss->ss1 != thread->sysenter_cs)) { - tss->ss1 = thread->sysenter_cs; + if (unlikely(tss->x86_tss.ss1 != thread->sysenter_cs)) { + tss->x86_tss.ss1 = thread->sysenter_cs; wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0); } } |