arch/ppc64/kernel/hvCall.S

   1 /*
   2  * arch/ppc64/kernel/hvCall.S
   3  *
   4  *
   5  * This file contains the code to perform calls to the
   6  * iSeries LPAR hypervisor
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version
  11  * 2 of the License, or (at your option) any later version.
  12  */
  13
  14 #include <asm/ppc_asm.h>
  15 #include <asm/processor.h>
  16
  17         .text
  18
  19 /*
  20  * Hypervisor call
  21  *
  22  * Invoke the iSeries hypervisor via the System Call instruction
  23  * Parameters are passed to this routine in registers r3 - r10
  24  *
  25  * r3 contains the HV function to be called
  26  * r4-r10 contain the operands to the hypervisor function
  27  *
  28  */
  29
  30 _GLOBAL(HvCall)
  31 _GLOBAL(HvCall0)
  32 _GLOBAL(HvCall1)
  33 _GLOBAL(HvCall2)
  34 _GLOBAL(HvCall3)
  35 _GLOBAL(HvCall4)
  36 _GLOBAL(HvCall5)
  37 _GLOBAL(HvCall6)
  38 _GLOBAL(HvCall7)
  39
  40
  41         mfcr    r0
  42         std     r0,-8(r1)
  43         stdu    r1,-(STACK_FRAME_OVERHEAD+16)(r1)
  44
  45         /* r0 = 0xffffffffffffffff indicates a hypervisor call */
  46
  47         li      r0,-1
  48
  49         /* Invoke the hypervisor */
  50
  51         sc
  52
  53         ld      r1,0(r1)
  54         ld      r0,-8(r1)
  55         mtcrf   0xff,r0
  56
  57         /*  return to caller, return value in r3 */
  58
  59         blr
  60
  61 _GLOBAL(HvCall0Ret16)
  62 _GLOBAL(HvCall1Ret16)
  63 _GLOBAL(HvCall2Ret16)
  64 _GLOBAL(HvCall3Ret16)
  65 _GLOBAL(HvCall4Ret16)
  66 _GLOBAL(HvCall5Ret16)
  67 _GLOBAL(HvCall6Ret16)
  68 _GLOBAL(HvCall7Ret16)
  69
  70         mfcr    r0
  71         std     r0,-8(r1)
  72         std     r31,-16(r1)
  73         stdu    r1,-(STACK_FRAME_OVERHEAD+32)(r1)
  74
  75         mr      r31,r4
  76         li      r0,-1
  77         mr      r4,r5
  78         mr      r5,r6
  79         mr      r6,r7
  80         mr      r7,r8
  81         mr      r8,r9
  82         mr      r9,r10
  83
  84         sc
  85
  86         std     r3,0(r31)
  87         std     r4,8(r31)
  88
  89         mr      r3,r5
  90
  91         ld      r1,0(r1)
  92         ld      r0,-8(r1)
  93         mtcrf   0xff,r0
  94         ld      r31,-16(r1)
  95
  96         blr
  97
  98