diff options
Diffstat (limited to 'xen/include/asm-ia64/xensystem.h')
| -rw-r--r-- | xen/include/asm-ia64/xensystem.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/xen/include/asm-ia64/xensystem.h b/xen/include/asm-ia64/xensystem.h index c7c9771fee..c1915646f2 100644 --- a/xen/include/asm-ia64/xensystem.h +++ b/xen/include/asm-ia64/xensystem.h @@ -61,5 +61,37 @@ extern struct task_struct *vmx_ia64_switch_to (void *next_task); } while (0) #endif // CONFIG_VTI +#define __cmpxchg_user(ptr, new, old, _size) \ +({ \ + register long __gu_r8 asm ("r8"); \ + register long __gu_r9 asm ("r9"); \ + asm volatile ("mov ar.ccv=%0;;" :: "rO"(old)); \ + asm volatile ("mov %2=r0;;\n" \ + "[1:]\tcmpxchg"_size".acq %0=[%3],%4,ar.ccv\n" \ + "\t.xdata4 \"__ex_table\", 1b-., 1f-.+4\n" \ + "[1:]" \ + : "=r"(old), "=r"(__gu_r9), "=r"(__gu_r8) : \ + "r"(ptr), "r"(new) : "memory"); \ + (old) = __gu_r9; \ + __gu_r8; \ +}) + + +// NOTE: Xen defines args as pointer,old,new whereas ia64 uses pointer,new,old +// so reverse them here +#define cmpxchg_user(_p,_o,_n) \ +({ \ + register long _rc; \ + ia64_mf(); \ + switch ( sizeof(*(_p)) ) { \ + case 1: _rc = __cmpxchg_user(_p,_n,_o,"1"); break; \ + case 2: _rc = __cmpxchg_user(_p,_n,_o,"2"); break; \ + case 4: _rc = __cmpxchg_user(_p,_n,_o,"4"); break; \ + case 8: _rc = __cmpxchg_user(_p,_n,_o,"8"); break; \ + } \ + ia64_mf(); \ + _rc; \ +}) + #endif // __ASSEMBLY__ #endif // _ASM_IA64_XENSYSTEM_H |