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1 | jermar | 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 | .text |
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32 | |||
33 | .global cpu_priority_high |
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34 | .global cpu_priority_low |
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35 | .global cpu_priority_restore |
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36 | .global cpu_priority_read |
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37 | .global cpu_halt |
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38 | .global cpu_sleep |
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39 | .global paging_on |
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40 | .global cpu_read_dba |
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41 | .global cpu_write_dba |
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42 | .global cpu_read_cr2 |
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43 | .global enable_l_apic_in_msr |
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44 | .global interrupt_handlers |
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45 | .global inb |
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46 | .global inw |
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47 | .global inl |
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48 | .global outb |
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49 | .global outw |
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50 | .global outl |
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51 | .global memcopy |
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52 | .global memsetb |
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53 | .global memsetw |
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54 | .global memcmp |
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55 | |||
56 | # |
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57 | # set priority level high |
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58 | cpu_priority_high: |
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59 | pushf |
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60 | pop %eax |
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61 | cli |
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62 | ret |
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63 | |||
64 | # |
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65 | # set priority level low |
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66 | cpu_priority_low: |
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67 | pushf |
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68 | pop %eax |
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69 | sti |
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70 | ret |
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71 | |||
72 | # |
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73 | # restore priority level |
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74 | cpu_priority_restore: |
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75 | push 4(%esp) |
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76 | popf |
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77 | ret |
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78 | |||
79 | # return raw priority level |
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80 | cpu_priority_read: |
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81 | pushf |
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82 | pop %eax |
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83 | ret |
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84 | |||
85 | cpu_halt: |
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86 | cpu_sleep: |
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87 | hlt |
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88 | ret |
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89 | |||
90 | paging_on: |
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91 | pushl %eax |
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92 | movl %cr0,%eax |
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93 | orl $(1<<31),%eax # paging on |
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94 | andl $~((1<<30)|(1<<29)),%eax # clear Cache Disable and not Write Though |
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95 | movl %eax,%cr0 |
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96 | jmp 0f |
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97 | 0: |
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98 | popl %eax |
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99 | ret |
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100 | |||
101 | cpu_read_dba: |
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102 | movl %cr3,%eax |
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103 | ret |
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104 | |||
105 | cpu_write_dba: |
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106 | pushl %eax |
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107 | movl 8(%esp),%eax |
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108 | movl %eax,%cr3 |
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109 | popl %eax |
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110 | ret |
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111 | |||
112 | cpu_read_cr2: |
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113 | movl %cr2,%eax |
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114 | ret |
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115 | |||
116 | enable_l_apic_in_msr: |
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117 | pusha |
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118 | |||
119 | movl $0x1b, %ecx |
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120 | rdmsr |
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121 | orl $(1<<11),%eax |
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122 | orl $(0xfee00000),%eax |
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123 | wrmsr |
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124 | |||
125 | popa |
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126 | ret |
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127 | |||
128 | .macro handler i n |
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129 | push %ebp |
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130 | movl %esp,%ebp |
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131 | pusha |
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132 | |||
133 | # we must fill the data segment registers |
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134 | movw $16,%ax |
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135 | movw %ax,%ds |
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136 | movw %ax,%es |
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137 | |||
138 | movl $(\i),%edi |
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139 | pushl %ebp |
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140 | addl $4,(%esp) |
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141 | pushl %edi |
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142 | call trap_dispatcher |
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143 | addl $8,%esp |
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144 | |||
145 | popa |
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146 | pop %ebp |
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147 | |||
148 | iret |
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149 | |||
150 | .if (\n-\i)-1 |
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151 | handler "(\i+1)",\n |
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152 | .endif |
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153 | .endm |
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154 | |||
155 | # keep in sync with pm.h !!! |
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156 | IDT_ITEMS=64 |
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157 | interrupt_handlers: |
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158 | h_start: |
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159 | handler 0 64 |
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160 | # handler 64 128 |
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161 | # handler 128 192 |
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162 | # handler 192 256 |
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163 | h_end: |
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164 | |||
165 | |||
166 | inb: |
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167 | push %edx |
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168 | xorl %eax,%eax |
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169 | movl 8(%esp),%edx |
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170 | inb %dx,%al |
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171 | pop %edx |
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172 | ret |
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173 | |||
174 | inw: |
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175 | push %edx |
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176 | xorl %eax,%eax |
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177 | movl 8(%esp),%edx |
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178 | inw %dx,%ax |
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179 | pop %edx |
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180 | ret |
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181 | |||
182 | inl: |
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183 | push %edx |
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184 | xorl %eax,%eax |
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185 | movl 8(%esp),%edx |
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186 | inl %dx,%eax |
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187 | pop %edx |
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188 | ret |
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189 | |||
190 | outb: |
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191 | push %ebp |
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192 | movl %esp,%ebp |
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193 | pusha |
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194 | |||
195 | movl 8(%ebp),%edx |
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196 | movl 12(%ebp),%eax |
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197 | outb %al,%dx |
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198 | |||
199 | popa |
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200 | pop %ebp |
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201 | ret |
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202 | |||
203 | outw: |
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204 | push %ebp |
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205 | movl %esp,%ebp |
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206 | pusha |
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207 | |||
208 | movl 8(%ebp),%edx |
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209 | movl 12(%ebp),%eax |
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210 | outw %ax,%dx |
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211 | |||
212 | popa |
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213 | pop %ebp |
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214 | ret |
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215 | |||
216 | outl: |
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217 | push %ebp |
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218 | movl %esp,%ebp |
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219 | pusha |
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220 | |||
221 | movl 8(%ebp),%edx |
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222 | movl 12(%ebp),%eax |
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223 | outl %eax,%dx |
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224 | |||
225 | popa |
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226 | pop %ebp |
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227 | ret |
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228 | |||
229 | SRC=8 |
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230 | DST=12 |
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231 | CNT=16 |
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232 | memcopy: |
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233 | push %ebp |
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234 | movl %esp,%ebp |
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235 | pusha |
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236 | |||
237 | cld |
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238 | movl CNT(%ebp),%ecx |
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239 | movl DST(%ebp),%edi |
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240 | movl SRC(%ebp),%esi |
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241 | |||
242 | rep movsb %ds:(%esi),%es:(%edi) |
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243 | |||
244 | popa |
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245 | pop %ebp |
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246 | ret |
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247 | |||
248 | DST=8 |
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249 | CNT=12 |
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250 | X=16 |
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251 | memsetw: |
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252 | push %ebp |
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253 | movl %esp,%ebp |
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254 | pusha |
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255 | |||
256 | cld |
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257 | movl CNT(%ebp),%ecx |
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258 | movl DST(%ebp),%edi |
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259 | movl X(%ebp),%eax |
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260 | |||
261 | rep stosw %ax,%es:(%edi) |
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262 | |||
263 | popa |
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264 | pop %ebp |
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265 | ret |
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266 | |||
267 | DST=8 |
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268 | CNT=12 |
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269 | X=16 |
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270 | memsetb: |
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271 | push %ebp |
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272 | movl %esp,%ebp |
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273 | pusha |
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274 | |||
275 | cld |
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276 | movl CNT(%ebp),%ecx |
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277 | movl DST(%ebp),%edi |
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278 | movl X(%ebp),%eax |
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279 | |||
280 | rep stosb %al,%es:(%edi) |
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281 | |||
282 | popa |
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283 | pop %ebp |
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284 | ret |
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285 | |||
286 | SRC=12 |
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287 | DST=16 |
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288 | CNT=20 |
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289 | memcmp: |
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290 | push %ebp |
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291 | subl $4,%esp |
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292 | movl %esp,%ebp |
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293 | |||
294 | pusha |
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295 | |||
296 | cld |
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297 | movl CNT(%ebp),%ecx |
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298 | movl DST(%ebp),%edi |
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299 | movl SRC(%ebp),%esi |
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300 | |||
301 | repe cmpsb %es:(%edi),%ds:(%esi) |
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302 | movl %ecx,(%ebp) |
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303 | |||
304 | popa |
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305 | |||
306 | movl (%ebp),%eax # return value => %eax (zero on success) |
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307 | addl $4,%esp |
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308 | pop %ebp |
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309 | |||
310 | ret |
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311 | |||
312 | |||
313 | # THIS IS USERSPACE CODE |
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314 | .global utext |
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315 | utext: |
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316 | 0: |
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317 | movl $0xdeadbeaf, %eax |
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318 | int $48 |
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319 | jmp 0b |
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320 | # not reached |
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321 | utext_end: |
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322 | |||
323 | .data |
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324 | .global utext_size |
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325 | utext_size: |
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326 | .long utext_end - utext |
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327 | |||
328 | |||
329 | .section K_DATA_START |
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330 | .global interrupt_handler_size |
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331 | |||
332 | interrupt_handler_size: .long (h_end-h_start)/IDT_ITEMS |