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1 /****************************************************************************** |
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2 * hypercall.h |
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3 * |
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4 * Linux-specific hypervisor handling. |
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5 * |
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6 * Copyright (c) 2002-2004, K A Fraser |
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7 * |
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8 * This program is free software; you can redistribute it and/or |
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9 * modify it under the terms of the GNU General Public License version 2 |
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10 * as published by the Free Software Foundation; or, when distributed |
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11 * separately from the Linux kernel or incorporated into other |
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12 * software packages, subject to the following license: |
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13 * |
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14 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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15 * of this source file (the "Software"), to deal in the Software without |
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16 * restriction, including without limitation the rights to use, copy, modify, |
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17 * merge, publish, distribute, sublicense, and/or sell copies of the Software, |
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18 * and to permit persons to whom the Software is furnished to do so, subject to |
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19 * the following conditions: |
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20 * |
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21 * The above copyright notice and this permission notice shall be included in |
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22 * all copies or substantial portions of the Software. |
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23 * |
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24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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27 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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29 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
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30 * IN THE SOFTWARE. |
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31 */ |
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32 |
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33 #ifndef _ASM_X86_XEN_HYPERCALL_H |
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34 #define _ASM_X86_XEN_HYPERCALL_H |
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35 |
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36 #include <linux/errno.h> |
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37 #include <linux/string.h> |
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38 |
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39 #include <xen/interface/xen.h> |
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40 #include <xen/interface/sched.h> |
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41 #include <xen/interface/physdev.h> |
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42 |
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43 /* |
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44 * The hypercall asms have to meet several constraints: |
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45 * - Work on 32- and 64-bit. |
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46 * The two architectures put their arguments in different sets of |
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47 * registers. |
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48 * |
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49 * - Work around asm syntax quirks |
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50 * It isn't possible to specify one of the rNN registers in a |
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51 * constraint, so we use explicit register variables to get the |
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52 * args into the right place. |
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53 * |
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54 * - Mark all registers as potentially clobbered |
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55 * Even unused parameters can be clobbered by the hypervisor, so we |
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56 * need to make sure gcc knows it. |
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57 * |
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58 * - Avoid compiler bugs. |
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59 * This is the tricky part. Because x86_32 has such a constrained |
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60 * register set, gcc versions below 4.3 have trouble generating |
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61 * code when all the arg registers and memory are trashed by the |
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62 * asm. There are syntactically simpler ways of achieving the |
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63 * semantics below, but they cause the compiler to crash. |
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64 * |
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65 * The only combination I found which works is: |
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66 * - assign the __argX variables first |
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67 * - list all actually used parameters as "+r" (__argX) |
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68 * - clobber the rest |
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69 * |
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70 * The result certainly isn't pretty, and it really shows up cpp's |
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71 * weakness as as macro language. Sorry. (But let's just give thanks |
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72 * there aren't more than 5 arguments...) |
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73 */ |
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74 |
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75 extern struct { char _entry[32]; } hypercall_page[]; |
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76 |
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77 #define __HYPERCALL "call hypercall_page+%c[offset]" |
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78 #define __HYPERCALL_ENTRY(x) \ |
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79 [offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0])) |
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80 |
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81 #ifdef CONFIG_X86_32 |
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82 #define __HYPERCALL_RETREG "eax" |
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83 #define __HYPERCALL_ARG1REG "ebx" |
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84 #define __HYPERCALL_ARG2REG "ecx" |
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85 #define __HYPERCALL_ARG3REG "edx" |
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86 #define __HYPERCALL_ARG4REG "esi" |
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87 #define __HYPERCALL_ARG5REG "edi" |
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88 #else |
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89 #define __HYPERCALL_RETREG "rax" |
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90 #define __HYPERCALL_ARG1REG "rdi" |
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91 #define __HYPERCALL_ARG2REG "rsi" |
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92 #define __HYPERCALL_ARG3REG "rdx" |
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93 #define __HYPERCALL_ARG4REG "r10" |
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94 #define __HYPERCALL_ARG5REG "r8" |
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95 #endif |
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96 |
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97 #define __HYPERCALL_DECLS \ |
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98 register unsigned long __res asm(__HYPERCALL_RETREG); \ |
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99 register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \ |
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100 register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \ |
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101 register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \ |
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102 register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \ |
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103 register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5; |
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104 |
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105 #define __HYPERCALL_0PARAM "=r" (__res) |
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106 #define __HYPERCALL_1PARAM __HYPERCALL_0PARAM, "+r" (__arg1) |
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107 #define __HYPERCALL_2PARAM __HYPERCALL_1PARAM, "+r" (__arg2) |
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108 #define __HYPERCALL_3PARAM __HYPERCALL_2PARAM, "+r" (__arg3) |
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109 #define __HYPERCALL_4PARAM __HYPERCALL_3PARAM, "+r" (__arg4) |
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110 #define __HYPERCALL_5PARAM __HYPERCALL_4PARAM, "+r" (__arg5) |
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111 |
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112 #define __HYPERCALL_0ARG() |
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113 #define __HYPERCALL_1ARG(a1) \ |
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114 __HYPERCALL_0ARG() __arg1 = (unsigned long)(a1); |
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115 #define __HYPERCALL_2ARG(a1,a2) \ |
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116 __HYPERCALL_1ARG(a1) __arg2 = (unsigned long)(a2); |
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117 #define __HYPERCALL_3ARG(a1,a2,a3) \ |
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118 __HYPERCALL_2ARG(a1,a2) __arg3 = (unsigned long)(a3); |
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119 #define __HYPERCALL_4ARG(a1,a2,a3,a4) \ |
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120 __HYPERCALL_3ARG(a1,a2,a3) __arg4 = (unsigned long)(a4); |
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121 #define __HYPERCALL_5ARG(a1,a2,a3,a4,a5) \ |
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122 __HYPERCALL_4ARG(a1,a2,a3,a4) __arg5 = (unsigned long)(a5); |
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123 |
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124 #define __HYPERCALL_CLOBBER5 "memory" |
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125 #define __HYPERCALL_CLOBBER4 __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG |
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126 #define __HYPERCALL_CLOBBER3 __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG |
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127 #define __HYPERCALL_CLOBBER2 __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG |
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128 #define __HYPERCALL_CLOBBER1 __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG |
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129 #define __HYPERCALL_CLOBBER0 __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG |
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130 |
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131 #define _hypercall0(type, name) \ |
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132 ({ \ |
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133 __HYPERCALL_DECLS; \ |
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134 __HYPERCALL_0ARG(); \ |
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135 asm volatile (__HYPERCALL \ |
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136 : __HYPERCALL_0PARAM \ |
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137 : __HYPERCALL_ENTRY(name) \ |
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138 : __HYPERCALL_CLOBBER0); \ |
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139 (type)__res; \ |
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140 }) |
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141 |
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142 #define _hypercall1(type, name, a1) \ |
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143 ({ \ |
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144 __HYPERCALL_DECLS; \ |
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145 __HYPERCALL_1ARG(a1); \ |
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146 asm volatile (__HYPERCALL \ |
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147 : __HYPERCALL_1PARAM \ |
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148 : __HYPERCALL_ENTRY(name) \ |
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149 : __HYPERCALL_CLOBBER1); \ |
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150 (type)__res; \ |
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151 }) |
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152 |
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153 #define _hypercall2(type, name, a1, a2) \ |
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154 ({ \ |
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155 __HYPERCALL_DECLS; \ |
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156 __HYPERCALL_2ARG(a1, a2); \ |
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157 asm volatile (__HYPERCALL \ |
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158 : __HYPERCALL_2PARAM \ |
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159 : __HYPERCALL_ENTRY(name) \ |
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160 : __HYPERCALL_CLOBBER2); \ |
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161 (type)__res; \ |
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162 }) |
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163 |
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164 #define _hypercall3(type, name, a1, a2, a3) \ |
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165 ({ \ |
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166 __HYPERCALL_DECLS; \ |
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167 __HYPERCALL_3ARG(a1, a2, a3); \ |
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168 asm volatile (__HYPERCALL \ |
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169 : __HYPERCALL_3PARAM \ |
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170 : __HYPERCALL_ENTRY(name) \ |
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171 : __HYPERCALL_CLOBBER3); \ |
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172 (type)__res; \ |
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173 }) |
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174 |
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175 #define _hypercall4(type, name, a1, a2, a3, a4) \ |
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176 ({ \ |
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177 __HYPERCALL_DECLS; \ |
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178 __HYPERCALL_4ARG(a1, a2, a3, a4); \ |
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179 asm volatile (__HYPERCALL \ |
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180 : __HYPERCALL_4PARAM \ |
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181 : __HYPERCALL_ENTRY(name) \ |
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182 : __HYPERCALL_CLOBBER4); \ |
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183 (type)__res; \ |
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184 }) |
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185 |
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186 #define _hypercall5(type, name, a1, a2, a3, a4, a5) \ |
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187 ({ \ |
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188 __HYPERCALL_DECLS; \ |
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189 __HYPERCALL_5ARG(a1, a2, a3, a4, a5); \ |
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190 asm volatile (__HYPERCALL \ |
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191 : __HYPERCALL_5PARAM \ |
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192 : __HYPERCALL_ENTRY(name) \ |
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193 : __HYPERCALL_CLOBBER5); \ |
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194 (type)__res; \ |
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195 }) |
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196 |
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197 static inline int |
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198 HYPERVISOR_set_trap_table(struct trap_info *table) |
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199 { |
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200 return _hypercall1(int, set_trap_table, table); |
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201 } |
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202 |
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203 static inline int |
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204 HYPERVISOR_mmu_update(struct mmu_update *req, int count, |
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205 int *success_count, domid_t domid) |
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206 { |
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207 return _hypercall4(int, mmu_update, req, count, success_count, domid); |
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208 } |
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209 |
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210 static inline int |
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211 HYPERVISOR_mmuext_op(struct mmuext_op *op, int count, |
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212 int *success_count, domid_t domid) |
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213 { |
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214 return _hypercall4(int, mmuext_op, op, count, success_count, domid); |
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215 } |
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216 |
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217 static inline int |
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218 HYPERVISOR_set_gdt(unsigned long *frame_list, int entries) |
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219 { |
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220 return _hypercall2(int, set_gdt, frame_list, entries); |
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221 } |
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222 |
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223 static inline int |
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224 HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp) |
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225 { |
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226 return _hypercall2(int, stack_switch, ss, esp); |
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227 } |
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228 |
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229 #ifdef CONFIG_X86_32 |
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230 static inline int |
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231 HYPERVISOR_set_callbacks(unsigned long event_selector, |
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232 unsigned long event_address, |
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233 unsigned long failsafe_selector, |
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234 unsigned long failsafe_address) |
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235 { |
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236 return _hypercall4(int, set_callbacks, |
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237 event_selector, event_address, |
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238 failsafe_selector, failsafe_address); |
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239 } |
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240 #else /* CONFIG_X86_64 */ |
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241 static inline int |
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242 HYPERVISOR_set_callbacks(unsigned long event_address, |
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243 unsigned long failsafe_address, |
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244 unsigned long syscall_address) |
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245 { |
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246 return _hypercall3(int, set_callbacks, |
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247 event_address, failsafe_address, |
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248 syscall_address); |
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249 } |
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250 #endif /* CONFIG_X86_{32,64} */ |
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251 |
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252 static inline int |
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253 HYPERVISOR_callback_op(int cmd, void *arg) |
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254 { |
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255 return _hypercall2(int, callback_op, cmd, arg); |
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256 } |
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257 |
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258 static inline int |
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259 HYPERVISOR_fpu_taskswitch(int set) |
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260 { |
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261 return _hypercall1(int, fpu_taskswitch, set); |
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262 } |
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263 |
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264 static inline int |
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265 HYPERVISOR_sched_op(int cmd, void *arg) |
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266 { |
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267 return _hypercall2(int, sched_op_new, cmd, arg); |
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268 } |
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269 |
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270 static inline long |
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271 HYPERVISOR_set_timer_op(u64 timeout) |
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272 { |
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273 unsigned long timeout_hi = (unsigned long)(timeout>>32); |
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274 unsigned long timeout_lo = (unsigned long)timeout; |
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275 return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi); |
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276 } |
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277 |
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278 static inline int |
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279 HYPERVISOR_set_debugreg(int reg, unsigned long value) |
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280 { |
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281 return _hypercall2(int, set_debugreg, reg, value); |
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282 } |
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283 |
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284 static inline unsigned long |
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285 HYPERVISOR_get_debugreg(int reg) |
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286 { |
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287 return _hypercall1(unsigned long, get_debugreg, reg); |
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288 } |
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289 |
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290 static inline int |
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291 HYPERVISOR_update_descriptor(u64 ma, u64 desc) |
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292 { |
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293 return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32); |
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294 } |
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295 |
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296 static inline int |
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297 HYPERVISOR_memory_op(unsigned int cmd, void *arg) |
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298 { |
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299 return _hypercall2(int, memory_op, cmd, arg); |
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300 } |
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301 |
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302 static inline int |
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303 HYPERVISOR_multicall(void *call_list, int nr_calls) |
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304 { |
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305 return _hypercall2(int, multicall, call_list, nr_calls); |
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306 } |
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307 |
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308 static inline int |
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309 HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val, |
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310 unsigned long flags) |
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311 { |
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312 if (sizeof(new_val) == sizeof(long)) |
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313 return _hypercall3(int, update_va_mapping, va, |
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314 new_val.pte, flags); |
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315 else |
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316 return _hypercall4(int, update_va_mapping, va, |
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317 new_val.pte, new_val.pte >> 32, flags); |
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318 } |
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319 |
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320 static inline int |
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321 HYPERVISOR_event_channel_op(int cmd, void *arg) |
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322 { |
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323 int rc = _hypercall2(int, event_channel_op, cmd, arg); |
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324 if (unlikely(rc == -ENOSYS)) { |
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325 struct evtchn_op op; |
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326 op.cmd = cmd; |
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327 memcpy(&op.u, arg, sizeof(op.u)); |
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328 rc = _hypercall1(int, event_channel_op_compat, &op); |
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329 memcpy(arg, &op.u, sizeof(op.u)); |
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330 } |
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331 return rc; |
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332 } |
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333 |
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334 static inline int |
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335 HYPERVISOR_xen_version(int cmd, void *arg) |
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336 { |
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337 return _hypercall2(int, xen_version, cmd, arg); |
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338 } |
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339 |
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340 static inline int |
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341 HYPERVISOR_console_io(int cmd, int count, char *str) |
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342 { |
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343 return _hypercall3(int, console_io, cmd, count, str); |
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344 } |
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345 |
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346 static inline int |
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347 HYPERVISOR_physdev_op(int cmd, void *arg) |
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348 { |
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349 int rc = _hypercall2(int, physdev_op, cmd, arg); |
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350 if (unlikely(rc == -ENOSYS)) { |
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351 struct physdev_op op; |
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352 op.cmd = cmd; |
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353 memcpy(&op.u, arg, sizeof(op.u)); |
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354 rc = _hypercall1(int, physdev_op_compat, &op); |
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355 memcpy(arg, &op.u, sizeof(op.u)); |
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356 } |
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357 return rc; |
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358 } |
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359 |
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360 static inline int |
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361 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count) |
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362 { |
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363 return _hypercall3(int, grant_table_op, cmd, uop, count); |
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364 } |
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365 |
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366 static inline int |
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367 HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val, |
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368 unsigned long flags, domid_t domid) |
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369 { |
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370 if (sizeof(new_val) == sizeof(long)) |
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371 return _hypercall4(int, update_va_mapping_otherdomain, va, |
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372 new_val.pte, flags, domid); |
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373 else |
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374 return _hypercall5(int, update_va_mapping_otherdomain, va, |
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375 new_val.pte, new_val.pte >> 32, |
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376 flags, domid); |
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377 } |
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378 |
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379 static inline int |
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380 HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type) |
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381 { |
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382 return _hypercall2(int, vm_assist, cmd, type); |
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383 } |
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384 |
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385 static inline int |
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386 HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args) |
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387 { |
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388 return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args); |
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389 } |
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390 |
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391 #ifdef CONFIG_X86_64 |
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392 static inline int |
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393 HYPERVISOR_set_segment_base(int reg, unsigned long value) |
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394 { |
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395 return _hypercall2(int, set_segment_base, reg, value); |
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396 } |
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397 #endif |
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398 |
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399 static inline int |
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400 HYPERVISOR_suspend(unsigned long srec) |
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401 { |
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402 return _hypercall3(int, sched_op, SCHEDOP_shutdown, |
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403 SHUTDOWN_suspend, srec); |
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404 } |
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405 |
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406 static inline int |
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407 HYPERVISOR_nmi_op(unsigned long op, unsigned long arg) |
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408 { |
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409 return _hypercall2(int, nmi_op, op, arg); |
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410 } |
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411 |
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412 static inline void |
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413 MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set) |
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414 { |
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415 mcl->op = __HYPERVISOR_fpu_taskswitch; |
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416 mcl->args[0] = set; |
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417 } |
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418 |
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419 static inline void |
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420 MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va, |
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421 pte_t new_val, unsigned long flags) |
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422 { |
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423 mcl->op = __HYPERVISOR_update_va_mapping; |
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424 mcl->args[0] = va; |
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425 if (sizeof(new_val) == sizeof(long)) { |
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426 mcl->args[1] = new_val.pte; |
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427 mcl->args[2] = flags; |
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428 } else { |
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429 mcl->args[1] = new_val.pte; |
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430 mcl->args[2] = new_val.pte >> 32; |
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431 mcl->args[3] = flags; |
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432 } |
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433 } |
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434 |
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435 static inline void |
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436 MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd, |
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437 void *uop, unsigned int count) |
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438 { |
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439 mcl->op = __HYPERVISOR_grant_table_op; |
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440 mcl->args[0] = cmd; |
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441 mcl->args[1] = (unsigned long)uop; |
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442 mcl->args[2] = count; |
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443 } |
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444 |
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445 static inline void |
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446 MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va, |
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447 pte_t new_val, unsigned long flags, |
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448 domid_t domid) |
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449 { |
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450 mcl->op = __HYPERVISOR_update_va_mapping_otherdomain; |
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451 mcl->args[0] = va; |
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452 if (sizeof(new_val) == sizeof(long)) { |
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453 mcl->args[1] = new_val.pte; |
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454 mcl->args[2] = flags; |
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455 mcl->args[3] = domid; |
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456 } else { |
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457 mcl->args[1] = new_val.pte; |
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458 mcl->args[2] = new_val.pte >> 32; |
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459 mcl->args[3] = flags; |
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460 mcl->args[4] = domid; |
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461 } |
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462 } |
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463 |
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464 static inline void |
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465 MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr, |
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466 struct desc_struct desc) |
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467 { |
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468 mcl->op = __HYPERVISOR_update_descriptor; |
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469 if (sizeof(maddr) == sizeof(long)) { |
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470 mcl->args[0] = maddr; |
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471 mcl->args[1] = *(unsigned long *)&desc; |
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472 } else { |
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473 mcl->args[0] = maddr; |
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474 mcl->args[1] = maddr >> 32; |
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475 mcl->args[2] = desc.a; |
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476 mcl->args[3] = desc.b; |
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477 } |
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478 } |
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479 |
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480 static inline void |
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481 MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg) |
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482 { |
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483 mcl->op = __HYPERVISOR_memory_op; |
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484 mcl->args[0] = cmd; |
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485 mcl->args[1] = (unsigned long)arg; |
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486 } |
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487 |
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488 static inline void |
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489 MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req, |
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490 int count, int *success_count, domid_t domid) |
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491 { |
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492 mcl->op = __HYPERVISOR_mmu_update; |
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493 mcl->args[0] = (unsigned long)req; |
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494 mcl->args[1] = count; |
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495 mcl->args[2] = (unsigned long)success_count; |
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496 mcl->args[3] = domid; |
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497 } |
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498 |
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499 static inline void |
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500 MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count, |
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501 int *success_count, domid_t domid) |
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502 { |
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503 mcl->op = __HYPERVISOR_mmuext_op; |
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504 mcl->args[0] = (unsigned long)op; |
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505 mcl->args[1] = count; |
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506 mcl->args[2] = (unsigned long)success_count; |
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507 mcl->args[3] = domid; |
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508 } |
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509 |
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510 static inline void |
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511 MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries) |
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512 { |
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513 mcl->op = __HYPERVISOR_set_gdt; |
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514 mcl->args[0] = (unsigned long)frames; |
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515 mcl->args[1] = entries; |
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516 } |
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517 |
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518 static inline void |
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519 MULTI_stack_switch(struct multicall_entry *mcl, |
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520 unsigned long ss, unsigned long esp) |
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521 { |
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522 mcl->op = __HYPERVISOR_stack_switch; |
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523 mcl->args[0] = ss; |
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524 mcl->args[1] = esp; |
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525 } |
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526 |
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527 #endif /* _ASM_X86_XEN_HYPERCALL_H */ |