diff options
Diffstat (limited to 'include/asm-x86/system.h')
| -rw-r--r-- | include/asm-x86/system.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/asm-x86/system.h b/include/asm-x86/system.h index d0803f8c70c..3740bada097 100644 --- a/include/asm-x86/system.h +++ b/include/asm-x86/system.h @@ -39,6 +39,27 @@ __asm__ __volatile__ ("movw %%dx,%1\n\t" \ #define set_limit(ldt, limit) _set_limit(((char *)&(ldt)) , ((limit)-1)) /* + * Load a segment. Fall back on loading the zero + * segment if something goes wrong.. + */ +#define loadsegment(seg, value) \ + asm volatile("\n" \ + "1:\t" \ + "movl %k0,%%" #seg "\n" \ + "2:\n" \ + ".section .fixup,\"ax\"\n" \ + "3:\t" \ + "movl %k1, %%" #seg "\n\t" \ + "jmp 2b\n" \ + ".previous\n" \ + ".section __ex_table,\"a\"\n\t" \ + _ASM_ALIGN "\n\t" \ + _ASM_PTR " 1b,3b\n" \ + ".previous" \ + : :"r" (value), "r" (0)) + + +/* * Save a segment register away */ #define savesegment(seg, value) \ |