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   1 /*
   2  * arch/ppc64/kernel/pSeries_hvCall.S
   3  *
   4  * This file contains the generic code to perform a call to the
   5  * pSeries LPAR hypervisor.
   6  * NOTE: this file will go away when we move to inline this work.
   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 #include <asm/hvcall.h>
  14 #include <asm/processor.h>
  15 #include <asm/ppc_asm.h>
  16
  17 #define STK_PARM(i)     (48 + ((i)-3)*8)
  18
  19         .text
  20
  21 /* long plpar_hcall(unsigned long opcode,               R3
  22                         unsigned long arg1,             R4
  23                         unsigned long arg2,             R5
  24                         unsigned long arg3,             R6
  25                         unsigned long arg4,             R7
  26                         unsigned long *out1,            R8
  27                         unsigned long *out2,            R9
  28                         unsigned long *out3);           R10
  29  */
  30 _GLOBAL(plpar_hcall)
  31         HMT_MEDIUM
  32
  33         mfcr    r0
  34
  35         std     r8,STK_PARM(r8)(r1)     /* Save out ptrs */
  36         std     r9,STK_PARM(r9)(r1)
  37         std     r10,STK_PARM(r10)(r1)
  38
  39         stw     r0,8(r1)
  40
  41         HVSC                            /* invoke the hypervisor */
  42
  43         lwz     r0,8(r1)
  44
  45         ld      r8,STK_PARM(r8)(r1)     /* Fetch r4-r6 ret args */
  46         ld      r9,STK_PARM(r9)(r1)
  47         ld      r10,STK_PARM(r10)(r1)
  48         std     r4,0(r8)
  49         std     r5,0(r9)
  50         std     r6,0(r10)
  51
  52         mtcrf   0xff,r0
  53         blr                             /* return r3 = status */
  54
  55
  56 /* Simple interface with no output values (other than status) */
  57 _GLOBAL(plpar_hcall_norets)
  58         HMT_MEDIUM
  59
  60         mfcr    r0
  61         stw     r0,8(r1)
  62
  63         HVSC                            /* invoke the hypervisor */
  64
  65         lwz     r0,8(r1)
  66         mtcrf   0xff,r0
  67         blr                             /* return r3 = status */
  68
  69
  70 /* long plpar_hcall_8arg_2ret(unsigned long opcode,     R3
  71                         unsigned long arg1,             R4
  72                         unsigned long arg2,             R5
  73                         unsigned long arg3,             R6
  74                         unsigned long arg4,             R7
  75                         unsigned long arg5,             R8
  76                         unsigned long arg6,             R9
  77                         unsigned long arg7,             R10
  78                         unsigned long arg8,             112(R1)
  79                         unsigned long *out1);           120(R1)
  80  */
  81 _GLOBAL(plpar_hcall_8arg_2ret)
  82         HMT_MEDIUM
  83
  84         mfcr    r0
  85         ld      r11,STK_PARM(r11)(r1)   /* put arg8 in R11 */
  86         stw     r0,8(r1)
  87
  88         HVSC                            /* invoke the hypervisor */
  89
  90         lwz     r0,8(r1)
  91         ld      r10,STK_PARM(r12)(r1)   /* Fetch r4 ret arg */
  92         std     r4,0(r10)
  93         mtcrf   0xff,r0
  94         blr                             /* return r3 = status */
  95
  96
  97 /* long plpar_hcall_4out(unsigned long opcode,          R3
  98                         unsigned long arg1,             R4
  99                         unsigned long arg2,             R5
 100                         unsigned long arg3,             R6
 101                         unsigned long arg4,             R7
 102                         unsigned long *out1,            R8
 103                         unsigned long *out2,            R9
 104                         unsigned long *out3,            R10
 105                         unsigned long *out4);           112(R1)
 106  */
 107 _GLOBAL(plpar_hcall_4out)
 108         HMT_MEDIUM
 109
 110         mfcr    r0
 111         stw     r0,8(r1)
 112
 113         std     r8,STK_PARM(r8)(r1)     /* Save out ptrs */
 114         std     r9,STK_PARM(r9)(r1)
 115         std     r10,STK_PARM(r10)(r1)
 116
 117         HVSC                            /* invoke the hypervisor */
 118
 119         lwz     r0,8(r1)
 120
 121         ld      r8,STK_PARM(r8)(r1)     /* Fetch r4-r7 ret args */
 122         ld      r9,STK_PARM(r9)(r1)
 123         ld      r10,STK_PARM(r10)(r1)
 124         ld      r11,STK_PARM(r11)(r1)
 125         std     r4,0(r8)
 126         std     r5,0(r9)
 127         std     r6,0(r10)
 128         std     r7,0(r11)
 129
 130         mtcrf   0xff,r0
 131         blr                             /* return r3 = status */