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1821 | decky | 1 | # |
2 | # Copyright (C) 2001-2004 Jakub Jermar |
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3 | # All rights reserved. |
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4 | # |
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5 | # Redistribution and use in source and binary forms, with or without |
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6 | # modification, are permitted provided that the following conditions |
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7 | # are met: |
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8 | # |
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9 | # - Redistributions of source code must retain the above copyright |
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10 | # notice, this list of conditions and the following disclaimer. |
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11 | # - Redistributions in binary form must reproduce the above copyright |
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12 | # notice, this list of conditions and the following disclaimer in the |
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13 | # documentation and/or other materials provided with the distribution. |
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14 | # - The name of the author may not be used to endorse or promote products |
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15 | # derived from this software without specific prior written permission. |
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16 | # |
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17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | # |
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28 | |||
29 | ## very low and hardware-level functions |
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30 | |||
31 | # Mask for interrupts 0 - 31 (bits 0 - 31) where 0 means that int has no error word |
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32 | # and 1 means interrupt with error word |
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33 | #define ERROR_WORD_INTERRUPT_LIST 0x00027D00 |
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34 | |||
35 | .text |
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36 | |||
37 | .global enable_l_apic_in_msr |
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38 | .global interrupt_handlers |
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39 | .global memcpy |
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40 | .global memcpy_from_uspace |
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41 | .global memcpy_from_uspace_failover_address |
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42 | .global memcpy_to_uspace |
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43 | .global memcpy_to_uspace_failover_address |
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44 | |||
45 | |||
46 | #define MEMCPY_DST 4 |
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47 | #define MEMCPY_SRC 8 |
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48 | #define MEMCPY_SIZE 12 |
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49 | |||
50 | /** Copy memory to/from userspace. |
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51 | * |
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52 | * This is almost conventional memcpy(). |
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53 | * The difference is that there is a failover part |
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54 | * to where control is returned from a page fault |
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55 | * if the page fault occurs during copy_from_uspace() |
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56 | * or copy_to_uspace(). |
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57 | * |
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58 | * @param MEMCPY_DST(%esp) Destination address. |
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59 | * @param MEMCPY_SRC(%esp) Source address. |
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60 | * @param MEMCPY_SIZE(%esp) Size. |
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61 | * |
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62 | * @return MEMCPY_SRC(%esp) on success and 0 on failure. |
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63 | */ |
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64 | memcpy: |
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65 | memcpy_from_uspace: |
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66 | memcpy_to_uspace: |
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67 | movl %edi, %edx /* save %edi */ |
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68 | movl %esi, %eax /* save %esi */ |
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69 | |||
70 | movl MEMCPY_SIZE(%esp), %ecx |
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71 | shrl $2, %ecx /* size / 4 */ |
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72 | |||
73 | movl MEMCPY_DST(%esp), %edi |
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74 | movl MEMCPY_SRC(%esp), %esi |
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75 | |||
76 | rep movsl /* copy as much as possible word by word */ |
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77 | |||
78 | movl MEMCPY_SIZE(%esp), %ecx |
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79 | andl $3, %ecx /* size % 4 */ |
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80 | jz 0f |
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81 | |||
82 | rep movsb /* copy the rest byte by byte */ |
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83 | |||
84 | 0: |
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85 | movl %edx, %edi |
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86 | movl %eax, %esi |
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87 | movl MEMCPY_SRC(%esp), %eax /* MEMCPY_SRC(%esp), success */ |
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88 | ret |
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89 | |||
90 | /* |
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91 | * We got here from as_page_fault() after the memory operations |
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92 | * above had caused a page fault. |
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93 | */ |
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94 | memcpy_from_uspace_failover_address: |
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95 | memcpy_to_uspace_failover_address: |
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96 | movl %edx, %edi |
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97 | movl %eax, %esi |
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98 | xorl %eax, %eax /* return 0, failure */ |
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99 | ret |
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100 | |||
101 | |||
102 | ## Enable local APIC |
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103 | # |
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104 | # Enable local APIC in MSR. |
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105 | # |
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106 | enable_l_apic_in_msr: |
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107 | push %eax |
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108 | |||
109 | movl $0x1b, %ecx |
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110 | rdmsr |
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111 | orl $(1<<11),%eax |
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112 | orl $(0xfee00000),%eax |
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113 | wrmsr |
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114 | |||
115 | pop %eax |
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116 | ret |
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117 | |||
118 | # Clear nested flag |
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119 | # overwrites %ecx |
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120 | .macro CLEAR_NT_FLAG |
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121 | pushfl |
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122 | pop %ecx |
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123 | and $0xffffbfff,%ecx |
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124 | push %ecx |
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125 | popfl |
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126 | .endm |
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127 | |||
128 | ## Declare interrupt handlers |
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129 | # |
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130 | # Declare interrupt handlers for n interrupt |
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131 | # vectors starting at vector i. |
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132 | # |
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133 | # The handlers setup data segment registers |
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134 | # and call exc_dispatch(). |
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135 | # |
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136 | #define INTERRUPT_ALIGN 64 |
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137 | .macro handler i n |
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138 | |||
139 | .ifeq \i-0x30 # Syscall handler |
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140 | push %ds |
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141 | push %es |
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142 | push %fs |
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143 | push %gs |
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144 | |||
145 | # Push arguments on stack |
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146 | push %edi |
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147 | push %esi |
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148 | push %edx |
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149 | push %ecx |
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150 | push %eax |
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151 | |||
152 | # we must fill the data segment registers |
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153 | movw $16,%ax |
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154 | movw %ax,%ds |
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155 | movw %ax,%es |
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156 | |||
157 | sti |
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158 | |||
159 | call syscall_handler # syscall_handler(ax,cx,dx,si,di) |
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160 | cli |
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161 | addl $20, %esp # clean-up of parameters |
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162 | |||
163 | pop %gs |
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164 | pop %fs |
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165 | pop %es |
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166 | pop %ds |
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167 | |||
168 | CLEAR_NT_FLAG |
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169 | iret |
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170 | .else |
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171 | /* |
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172 | * This macro distinguishes between two versions of ia32 exceptions. |
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173 | * One version has error word and the other does not have it. |
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174 | * The latter version fakes the error word on the stack so that the |
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175 | * handlers and istate_t can be the same for both types. |
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176 | */ |
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177 | .iflt \i-32 |
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178 | .if (1 << \i) & ERROR_WORD_INTERRUPT_LIST |
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179 | /* |
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180 | * With error word, do nothing |
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181 | */ |
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182 | .else |
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183 | /* |
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184 | * Version without error word, |
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185 | */ |
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186 | subl $4, %esp |
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187 | .endif |
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188 | .else |
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189 | /* |
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190 | * Version without error word, |
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191 | */ |
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192 | subl $4, %esp |
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193 | .endif |
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194 | |||
195 | push %ds |
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196 | push %es |
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197 | push %fs |
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198 | push %gs |
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199 | |||
200 | #ifdef CONFIG_DEBUG_ALLREGS |
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201 | push %ebx |
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202 | push %ebp |
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203 | push %edi |
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204 | push %esi |
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205 | #else |
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206 | sub $16, %esp |
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207 | #endif |
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208 | push %edx |
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209 | push %ecx |
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210 | push %eax |
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211 | |||
212 | # we must fill the data segment registers |
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213 | movw $16,%ax |
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214 | movw %ax,%ds |
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215 | movw %ax,%es |
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216 | |||
217 | pushl %esp # *istate |
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218 | pushl $(\i) # intnum |
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219 | call exc_dispatch # excdispatch(intnum, *istate) |
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220 | addl $8,%esp # Clear arguments from stack |
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221 | |||
222 | CLEAR_NT_FLAG # Modifies %ecx |
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223 | |||
224 | pop %eax |
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225 | pop %ecx |
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226 | pop %edx |
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227 | #ifdef CONFIG_DEBUG_ALLREGS |
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228 | pop %esi |
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229 | pop %edi |
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230 | pop %ebp |
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231 | pop %ebx |
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232 | #else |
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233 | add $16, %esp |
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234 | #endif |
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235 | |||
236 | pop %gs |
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237 | pop %fs |
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238 | pop %es |
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239 | pop %ds |
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240 | |||
241 | addl $4,%esp # Skip error word, no matter whether real or fake. |
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242 | iret |
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243 | .endif |
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244 | |||
245 | .align INTERRUPT_ALIGN |
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246 | .if (\n-\i)-1 |
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247 | handler "(\i+1)",\n |
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248 | .endif |
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249 | .endm |
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250 | |||
251 | # keep in sync with pm.h !!! |
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252 | IDT_ITEMS=64 |
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253 | .align INTERRUPT_ALIGN |
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254 | interrupt_handlers: |
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255 | h_start: |
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256 | handler 0 IDT_ITEMS |
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257 | h_end: |
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258 | |||
259 | .data |
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260 | .global interrupt_handler_size |
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261 | |||
262 | interrupt_handler_size: .long (h_end-h_start)/IDT_ITEMS |