| From | Andi Kleen <> | Subject | Re: [RFC PATCH 18/35] Support gdt/idt/ldt handling on Xen. | Date | Wed, 22 Mar 2006 15:30:51 +0100 |
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On Wednesday 22 March 2006 07:30, Chris Wright wrote:
> > -#define load_TR_desc() __asm__ __volatile__("ltr %w0"::"q" (GDT_ENTRY_TSS*8)) > -#define load_LDT_desc() __asm__ __volatile__("lldt %w0"::"q" (GDT_ENTRY_LDT*8)) > - > -#define load_gdt(dtr) __asm__ __volatile("lgdt %0"::"m" (*dtr)) > -#define load_idt(dtr) __asm__ __volatile("lidt %0"::"m" (*dtr)) > -#define load_tr(tr) __asm__ __volatile("ltr %0"::"mr" (tr)) > -#define load_ldt(ldt) __asm__ __volatile("lldt %0"::"mr" (ldt)) > - > -#define store_gdt(dtr) __asm__ ("sgdt %0":"=m" (*dtr)) > -#define store_idt(dtr) __asm__ ("sidt %0":"=m" (*dtr)) > -#define store_tr(tr) __asm__ ("str %0":"=mr" (tr)) > -#define store_ldt(ldt) __asm__ ("sldt %0":"=mr" (ldt))
These are all very infrequent except perhaps LLDT. I suspect trapping would work too. But ok.
> -#define _set_tssldt_desc(n,addr,limit,type) \
[...]
Why are you moving these? Xen should just be parsing the same structures as the hardware, shouldn't it?
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