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132 | vana | 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 | |||
137 | vana | 31 | # Mask for interrupts 0 - 31 (bits 0 - 31) where 0 means that int has no error word |
32 | # and 1 means interrupt with error word |
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132 | vana | 33 | #define ERROR_WORD_INTERRUPT_LIST 0x00027D00 |
34 | |||
35 | .text |
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36 | |||
37 | .global paging_on |
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38 | .global enable_l_apic_in_msr |
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39 | .global interrupt_handlers |
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40 | .global inb |
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41 | .global inw |
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42 | .global inl |
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43 | .global outb |
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44 | .global outw |
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45 | .global outl |
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46 | .global memcopy |
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47 | .global memsetb |
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48 | .global memsetw |
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49 | .global memcmp |
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50 | |||
51 | |||
52 | ## Turn paging on |
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53 | # |
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54 | # Enable paging and write-back caching in CR0. |
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55 | # |
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56 | paging_on: |
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57 | pushl %eax |
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58 | movl %cr0,%eax |
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59 | orl $(1<<31),%eax # paging on |
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60 | andl $~((1<<30)|(1<<29)),%eax # clear Cache Disable and not Write Though |
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61 | movl %eax,%cr0 |
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62 | jmp 0f |
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63 | 0: |
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64 | popl %eax |
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65 | ret |
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66 | |||
67 | |||
68 | ## Enable local APIC |
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69 | # |
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70 | # Enable local APIC in MSR. |
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71 | # |
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72 | enable_l_apic_in_msr: |
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73 | pusha |
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74 | |||
75 | movl $0x1b, %ecx |
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76 | rdmsr |
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77 | orl $(1<<11),%eax |
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78 | orl $(0xfee00000),%eax |
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79 | wrmsr |
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80 | |||
81 | popa |
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82 | ret |
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83 | |||
84 | |||
85 | ## Declare interrupt handlers |
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86 | # |
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87 | # Declare interrupt handlers for n interrupt |
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88 | # vectors starting at vector i. |
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89 | # |
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90 | # The handlers setup data segment registers |
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91 | # and call trap_dispatcher(). |
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92 | # |
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93 | .macro handler i n |
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94 | push %ebp |
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95 | movl %esp,%ebp |
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96 | pusha |
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97 | |||
98 | push %ds |
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99 | push %es |
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100 | |||
101 | # we must fill the data segment registers |
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102 | movw $16,%ax |
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103 | movw %ax,%ds |
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104 | movw %ax,%es |
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105 | |||
106 | movl $(\i),%edi |
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107 | pushl %ebp |
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108 | addl $4,(%esp) |
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109 | pushl %edi |
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110 | call trap_dispatcher |
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111 | addl $8,%esp |
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112 | |||
113 | pop %es |
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114 | pop %ds |
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115 | |||
137 | vana | 116 | |
141 | vana | 117 | # CLNT |
118 | pushfl; |
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119 | pop %eax; |
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142 | vana | 120 | and $0xFFFFBFFF,%eax; |
141 | vana | 121 | push %eax; |
122 | popfl; |
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123 | |||
124 | |||
125 | |||
137 | vana | 126 | # Test if this is interrupt with error word or not |
132 | vana | 127 | mov $\i,%cl; |
128 | movl $1,%eax; |
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129 | test $0xe0,%cl; |
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130 | jnz 0f; |
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136 | vana | 131 | and $0x1f,%cl; |
132 | vana | 132 | shl %cl,%eax; |
133 | and $ERROR_WORD_INTERRUPT_LIST,%eax; |
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136 | vana | 134 | jz 0f; |
132 | vana | 135 | |
137 | vana | 136 | |
137 | # Return with error word |
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132 | vana | 138 | popa; |
139 | pop %ebp; |
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137 | vana | 140 | add $4,%esp; # Skip error word |
132 | vana | 141 | iret; |
142 | |||
143 | 0: |
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137 | vana | 144 | # Return with no error word |
132 | vana | 145 | popa |
146 | pop %ebp |
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147 | iret |
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148 | |||
149 | .if (\n-\i)-1 |
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150 | handler "(\i+1)",\n |
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151 | .endif |
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152 | .endm |
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153 | |||
154 | # keep in sync with pm.h !!! |
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155 | IDT_ITEMS=64 |
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156 | interrupt_handlers: |
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157 | h_start: |
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158 | handler 0 64 |
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159 | # handler 64 128 |
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160 | # handler 128 192 |
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161 | # handler 192 256 |
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162 | h_end: |
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163 | |||
164 | |||
165 | ## I/O input (byte) |
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166 | # |
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167 | # Get a byte from I/O port and store it AL. |
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168 | # |
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169 | inb: |
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170 | push %edx |
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171 | xorl %eax,%eax |
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172 | movl 8(%esp),%edx |
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173 | inb %dx,%al |
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174 | pop %edx |
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175 | ret |
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176 | |||
177 | |||
178 | ## I/O input (word) |
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179 | # |
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180 | # Get a word from I/O port and store it AX. |
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181 | # |
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182 | inw: |
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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 | inw %dx,%ax |
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187 | pop %edx |
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188 | ret |
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189 | |||
190 | |||
191 | ## I/O input (dword) |
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192 | # |
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193 | # Get a dword from I/O port and store it EAX. |
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194 | # |
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195 | inl: |
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196 | push %edx |
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197 | xorl %eax,%eax |
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198 | movl 8(%esp),%edx |
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199 | inl %dx,%eax |
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200 | pop %edx |
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201 | ret |
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202 | |||
203 | |||
204 | ## I/O output (byte) |
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205 | # |
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206 | # Send a byte to I/O port. |
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207 | # |
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208 | outb: |
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209 | push %ebp |
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210 | movl %esp,%ebp |
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211 | pusha |
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212 | |||
213 | movl 8(%ebp),%edx |
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214 | movl 12(%ebp),%eax |
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215 | outb %al,%dx |
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216 | |||
217 | popa |
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218 | pop %ebp |
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219 | ret |
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220 | |||
221 | |||
222 | ## I/O output (word) |
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223 | # |
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224 | # Send a word to I/O port. |
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225 | # |
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226 | outw: |
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227 | push %ebp |
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228 | movl %esp,%ebp |
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229 | pusha |
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230 | |||
231 | movl 8(%ebp),%edx |
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232 | movl 12(%ebp),%eax |
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233 | outw %ax,%dx |
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234 | |||
235 | popa |
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236 | pop %ebp |
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237 | ret |
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238 | |||
239 | |||
240 | ## I/O output (dword) |
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241 | # |
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242 | # Send a dword to I/O port. |
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243 | # |
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244 | outl: |
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245 | push %ebp |
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246 | movl %esp,%ebp |
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247 | pusha |
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248 | |||
249 | movl 8(%ebp),%edx |
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250 | movl 12(%ebp),%eax |
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251 | outl %eax,%dx |
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252 | |||
253 | popa |
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254 | pop %ebp |
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255 | ret |
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256 | |||
257 | |||
258 | ## Copy memory |
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259 | # |
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260 | # Copy a given number of bytes (3rd argument) |
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198 | jermar | 261 | # from the memory location defined by 2nd argument |
262 | # to the memory location defined by 1st argument. |
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132 | vana | 263 | # The memory areas cannot overlap. |
264 | # |
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196 | vana | 265 | SRC=12 |
266 | DST=8 |
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132 | vana | 267 | CNT=16 |
268 | memcopy: |
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269 | push %ebp |
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270 | movl %esp,%ebp |
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271 | pusha |
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272 | |||
273 | cld |
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274 | movl CNT(%ebp),%ecx |
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275 | movl DST(%ebp),%edi |
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276 | movl SRC(%ebp),%esi |
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277 | |||
278 | rep movsb %ds:(%esi),%es:(%edi) |
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279 | |||
280 | popa |
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281 | pop %ebp |
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282 | ret |
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283 | |||
284 | |||
285 | ## Fill memory with bytes |
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286 | # |
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287 | # Fill a given number of bytes (2nd argument) |
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288 | # at memory defined by 1st argument with the |
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289 | # byte value defined by 3rd argument. |
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290 | # |
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291 | DST=8 |
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292 | CNT=12 |
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293 | X=16 |
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294 | memsetb: |
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295 | push %ebp |
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296 | movl %esp,%ebp |
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297 | pusha |
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298 | |||
299 | cld |
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300 | movl CNT(%ebp),%ecx |
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301 | movl DST(%ebp),%edi |
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302 | movl X(%ebp),%eax |
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303 | |||
304 | rep stosb %al,%es:(%edi) |
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305 | |||
306 | popa |
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307 | pop %ebp |
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308 | ret |
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309 | |||
310 | |||
311 | ## Fill memory with words |
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312 | # |
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313 | # Fill a given number of words (2nd argument) |
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314 | # at memory defined by 1st argument with the |
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315 | # word value defined by 3rd argument. |
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316 | # |
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317 | DST=8 |
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318 | CNT=12 |
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319 | X=16 |
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320 | memsetw: |
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321 | push %ebp |
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322 | movl %esp,%ebp |
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323 | pusha |
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324 | |||
325 | cld |
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326 | movl CNT(%ebp),%ecx |
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327 | movl DST(%ebp),%edi |
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328 | movl X(%ebp),%eax |
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329 | |||
330 | rep stosw %ax,%es:(%edi) |
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331 | |||
332 | popa |
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333 | pop %ebp |
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334 | ret |
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335 | |||
336 | |||
337 | ## Compare memory regions for equality |
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338 | # |
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339 | # Compare a given number of bytes (3rd argument) |
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340 | # at memory locations defined by 1st and 2nd argument |
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341 | # for equality. If the bytes are equal, EAX contains |
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342 | # 0. |
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343 | # |
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344 | SRC=12 |
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345 | DST=16 |
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346 | CNT=20 |
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347 | memcmp: |
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348 | push %ebp |
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349 | subl $4,%esp |
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350 | movl %esp,%ebp |
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351 | |||
352 | pusha |
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353 | |||
354 | cld |
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355 | movl CNT(%ebp),%ecx |
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356 | movl DST(%ebp),%edi |
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357 | movl SRC(%ebp),%esi |
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358 | |||
359 | repe cmpsb %es:(%edi),%ds:(%esi) |
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360 | movl %ecx,(%ebp) |
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361 | |||
362 | popa |
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363 | |||
364 | movl (%ebp),%eax # return value => %eax (zero on success) |
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365 | addl $4,%esp |
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366 | pop %ebp |
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367 | |||
368 | ret |
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369 | |||
370 | |||
371 | # THIS IS USERSPACE CODE |
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372 | .global utext |
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373 | utext: |
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136 | vana | 374 | xor %ax,%ax; |
375 | mov %ax,%ds; |
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376 | mov %ax,%es; |
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377 | mov %ax,%fs; |
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378 | mov %ax,%gs; |
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132 | vana | 379 | 0: |
168 | jermar | 380 | int $48 |
132 | vana | 381 | jmp 0b |
382 | # not reached |
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383 | utext_end: |
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384 | |||
385 | .data |
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386 | .global utext_size |
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387 | utext_size: |
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388 | .long utext_end - utext |
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389 | |||
390 | |||
391 | #.section K_DATA_START |
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392 | .global interrupt_handler_size |
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393 | |||
394 | interrupt_handler_size: .long (h_end-h_start)/IDT_ITEMS |