arch/x86_64/kernel/xen_entry.S

   1 /*
   2  * Copied from arch/xen/i386/kernel/entry.S
   3  */
   4 /* Offsets into shared_info_t. */
   5 #define evtchn_upcall_pending           /* 0 */
   6 #define evtchn_upcall_mask              1
   7
   8 #define sizeof_vcpu_shift               6
   9
  10 #ifdef CONFIG_SMP
  11 //#define preempt_disable(reg)  incl threadinfo_preempt_count(reg)
  12 //#define preempt_enable(reg)   decl threadinfo_preempt_count(reg)
  13 #define preempt_disable(reg)
  14 #define preempt_enable(reg)
  15 #define XEN_GET_VCPU_INFO(reg)  preempt_disable(%rbp)                   ; \
  16                                 movq %gs:pda_cpunumber,reg              ; \
  17                                 shl  $32, reg                           ; \
  18                                 shr  $32-sizeof_vcpu_shift,reg          ; \
  19                                 addq HYPERVISOR_shared_info,reg
  20 #define XEN_PUT_VCPU_INFO(reg)  preempt_enable(%rbp)                    ; \
  21 #define XEN_PUT_VCPU_INFO_fixup .byte 0xff,0xff,0xff
  22 #else
  23 #define XEN_GET_VCPU_INFO(reg)  movq HYPERVISOR_shared_info,reg
  24 #define XEN_PUT_VCPU_INFO(reg)
  25 #define XEN_PUT_VCPU_INFO_fixup
  26 #endif
  27
  28 #define XEN_LOCKED_BLOCK_EVENTS(reg)    movb $1,evtchn_upcall_mask(reg)
  29 #define XEN_LOCKED_UNBLOCK_EVENTS(reg)  movb $0,evtchn_upcall_mask(reg)
  30 #define XEN_BLOCK_EVENTS(reg)   XEN_GET_VCPU_INFO(reg)                  ; \
  31                                 XEN_LOCKED_BLOCK_EVENTS(reg)            ; \
  32                                 XEN_PUT_VCPU_INFO(reg)
  33 #define XEN_UNBLOCK_EVENTS(reg) XEN_GET_VCPU_INFO(reg)                  ; \
  34                                 XEN_LOCKED_UNBLOCK_EVENTS(reg)          ; \
  35                                 XEN_PUT_VCPU_INFO(reg)
  36 #define XEN_TEST_PENDING(reg)   testb $0xFF,evtchn_upcall_pending(reg)
  37
  38 VGCF_IN_SYSCALL = (1<<8)
  39
  40