arch/sparc/kernel/helpers.S

   1         .align  32
   2         .globl  __flushw_user
   3         .type   __flushw_user,#function
   4 __flushw_user:
   5         rdpr    %otherwin, %g1
   6         brz,pn  %g1, 2f
   7          clr    %g2
   8 1:      save    %sp, -128, %sp
   9         rdpr    %otherwin, %g1
  10         brnz,pt %g1, 1b
  11          add    %g2, 1, %g2
  12 1:      sub     %g2, 1, %g2
  13         brnz,pt %g2, 1b
  14          restore %g0, %g0, %g0
  15 2:      retl
  16          nop
  17         .size   __flushw_user,.-__flushw_user
  18
  19         /* Flush %fp and %i7 to the stack for all register
  20          * windows active inside of the cpu.  This allows
  21          * show_stack_trace() to avoid using an expensive
  22          * 'flushw'.
  23          */
  24         .globl          stack_trace_flush
  25         .type           stack_trace_flush,#function
  26 stack_trace_flush:
  27         rdpr            %pstate, %o0
  28         wrpr            %o0, PSTATE_IE, %pstate
  29
  30         rdpr            %cwp, %g1
  31         rdpr            %canrestore, %g2
  32         sub             %g1, 1, %g3
  33
  34 1:      brz,pn          %g2, 2f
  35          sub            %g2, 1, %g2
  36         wrpr            %g3, %cwp
  37         stx             %fp, [%sp + STACK_BIAS + RW_V9_I6]
  38         stx             %i7, [%sp + STACK_BIAS + RW_V9_I7]
  39         ba,pt           %xcc, 1b
  40          sub            %g3, 1, %g3
  41
  42 2:      wrpr            %g1, %cwp
  43         wrpr            %o0, %pstate
  44
  45         retl
  46          nop
  47         .size           stack_trace_flush,.-stack_trace_flush
  48
  49 #ifdef CONFIG_SMP
  50         .globl          hard_smp_processor_id
  51         .type           hard_smp_processor_id,#function
  52 hard_smp_processor_id:
  53 #endif
  54         .globl          real_hard_smp_processor_id
  55         .type           real_hard_smp_processor_id,#function
  56 real_hard_smp_processor_id:
  57         __GET_CPUID(%o0)
  58         retl
  59          nop
  60 #ifdef CONFIG_SMP
  61         .size           hard_smp_processor_id,.-hard_smp_processor_id
  62 #endif
  63         .size           real_hard_smp_processor_id,.-real_hard_smp_processor_id