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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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205 | jermar | 43 | .global memcpy |
132 | vana | 44 | .global memsetb |
45 | .global memsetw |
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46 | .global memcmp |
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47 | |||
48 | |||
49 | ## Turn paging on |
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50 | # |
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51 | # Enable paging and write-back caching in CR0. |
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52 | # |
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53 | paging_on: |
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316 | jermar | 54 | movl %cr0,%edx |
55 | orl $(1<<31),%edx # paging on |
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56 | andl $~((1<<30)|(1<<29)),%edx # clear Cache Disable and not Write Though |
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57 | movl %edx,%cr0 |
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132 | vana | 58 | jmp 0f |
59 | 0: |
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60 | ret |
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61 | |||
62 | |||
63 | ## Enable local APIC |
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64 | # |
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65 | # Enable local APIC in MSR. |
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66 | # |
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67 | enable_l_apic_in_msr: |
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316 | jermar | 68 | push %eax |
69 | |||
132 | vana | 70 | movl $0x1b, %ecx |
71 | rdmsr |
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72 | orl $(1<<11),%eax |
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73 | orl $(0xfee00000),%eax |
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74 | wrmsr |
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316 | jermar | 75 | |
76 | pop %eax |
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132 | vana | 77 | ret |
78 | |||
79 | |||
80 | ## Declare interrupt handlers |
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81 | # |
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82 | # Declare interrupt handlers for n interrupt |
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83 | # vectors starting at vector i. |
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84 | # |
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85 | # The handlers setup data segment registers |
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86 | # and call trap_dispatcher(). |
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87 | # |
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88 | .macro handler i n |
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89 | push %ebp |
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90 | movl %esp,%ebp |
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91 | pusha |
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92 | |||
93 | push %ds |
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94 | push %es |
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95 | |||
96 | # we must fill the data segment registers |
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97 | movw $16,%ax |
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98 | movw %ax,%ds |
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99 | movw %ax,%es |
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100 | |||
101 | movl $(\i),%edi |
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102 | pushl %ebp |
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103 | addl $4,(%esp) |
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104 | pushl %edi |
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105 | call trap_dispatcher |
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106 | addl $8,%esp |
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107 | |||
108 | pop %es |
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109 | pop %ds |
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110 | |||
137 | vana | 111 | |
141 | vana | 112 | # CLNT |
316 | jermar | 113 | pushfl |
114 | pop %eax |
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115 | and $0xFFFFBFFF,%eax |
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116 | push %eax |
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117 | popfl |
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141 | vana | 118 | |
119 | |||
120 | |||
137 | vana | 121 | # Test if this is interrupt with error word or not |
316 | jermar | 122 | mov $\i,%cl |
123 | movl $1,%eax |
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124 | test $0xe0,%cl |
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125 | jnz 0f |
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126 | and $0x1f,%cl |
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127 | shl %cl,%eax |
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128 | and $ERROR_WORD_INTERRUPT_LIST,%eax |
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129 | jz 0f |
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132 | vana | 130 | |
137 | vana | 131 | |
132 | # Return with error word |
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316 | jermar | 133 | popa |
134 | pop %ebp |
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135 | add $4,%esp # Skip error word |
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136 | iret |
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132 | vana | 137 | |
138 | 0: |
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137 | vana | 139 | # Return with no error word |
132 | vana | 140 | popa |
141 | pop %ebp |
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142 | iret |
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143 | |||
144 | .if (\n-\i)-1 |
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145 | handler "(\i+1)",\n |
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146 | .endif |
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147 | .endm |
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148 | |||
149 | # keep in sync with pm.h !!! |
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150 | IDT_ITEMS=64 |
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151 | interrupt_handlers: |
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152 | h_start: |
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153 | handler 0 64 |
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154 | # handler 64 128 |
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155 | # handler 128 192 |
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156 | # handler 192 256 |
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157 | h_end: |
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158 | |||
159 | |||
160 | ## I/O input (byte) |
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161 | # |
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162 | # Get a byte from I/O port and store it AL. |
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163 | # |
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164 | inb: |
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165 | xorl %eax,%eax |
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316 | jermar | 166 | movl 4(%esp),%edx |
132 | vana | 167 | inb %dx,%al |
168 | ret |
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169 | |||
170 | |||
171 | ## I/O input (word) |
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172 | # |
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173 | # Get a word from I/O port and store it AX. |
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174 | # |
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175 | inw: |
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176 | xorl %eax,%eax |
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316 | jermar | 177 | movl 4(%esp),%edx |
132 | vana | 178 | inw %dx,%ax |
179 | ret |
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180 | |||
181 | |||
182 | ## I/O input (dword) |
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183 | # |
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184 | # Get a dword from I/O port and store it EAX. |
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185 | # |
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186 | inl: |
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187 | xorl %eax,%eax |
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316 | jermar | 188 | movl 4(%esp),%edx |
132 | vana | 189 | inl %dx,%eax |
190 | ret |
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191 | |||
192 | |||
193 | ## Copy memory |
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194 | # |
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195 | # Copy a given number of bytes (3rd argument) |
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198 | jermar | 196 | # from the memory location defined by 2nd argument |
197 | # to the memory location defined by 1st argument. |
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132 | vana | 198 | # The memory areas cannot overlap. |
199 | # |
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316 | jermar | 200 | SRC=16 |
201 | DST=12 |
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202 | CNT=20 |
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205 | jermar | 203 | memcpy: |
316 | jermar | 204 | push %esi |
205 | push %edi |
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132 | vana | 206 | |
316 | jermar | 207 | movl CNT(%esp),%ecx |
208 | movl DST(%esp),%edi |
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209 | movl SRC(%esp),%esi |
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132 | vana | 210 | |
211 | rep movsb %ds:(%esi),%es:(%edi) |
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212 | |||
316 | jermar | 213 | pop %edi |
214 | pop %esi |
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132 | vana | 215 | ret |
216 | |||
217 | |||
218 | ## Fill memory with bytes |
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219 | # |
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220 | # Fill a given number of bytes (2nd argument) |
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221 | # at memory defined by 1st argument with the |
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222 | # byte value defined by 3rd argument. |
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223 | # |
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316 | jermar | 224 | DST=12 |
225 | CNT=16 |
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226 | X=20 |
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132 | vana | 227 | memsetb: |
316 | jermar | 228 | push %eax |
229 | push %edi |
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132 | vana | 230 | |
316 | jermar | 231 | movl CNT(%esp),%ecx |
232 | movl DST(%esp),%edi |
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233 | movl X(%esp),%eax |
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132 | vana | 234 | |
235 | rep stosb %al,%es:(%edi) |
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236 | |||
316 | jermar | 237 | pop %edi |
238 | pop %eax |
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132 | vana | 239 | ret |
240 | |||
241 | |||
242 | ## Fill memory with words |
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243 | # |
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244 | # Fill a given number of words (2nd argument) |
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245 | # at memory defined by 1st argument with the |
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246 | # word value defined by 3rd argument. |
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247 | # |
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316 | jermar | 248 | DST=12 |
249 | CNT=16 |
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250 | X=20 |
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132 | vana | 251 | memsetw: |
316 | jermar | 252 | push %eax |
253 | push %edi |
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132 | vana | 254 | |
316 | jermar | 255 | movl CNT(%esp),%ecx |
256 | movl DST(%esp),%edi |
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257 | movl X(%esp),%eax |
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132 | vana | 258 | |
259 | rep stosw %ax,%es:(%edi) |
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260 | |||
316 | jermar | 261 | pop %edi |
262 | pop %eax |
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263 | |||
132 | vana | 264 | ret |
265 | |||
266 | |||
267 | ## Compare memory regions for equality |
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268 | # |
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269 | # Compare a given number of bytes (3rd argument) |
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270 | # at memory locations defined by 1st and 2nd argument |
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271 | # for equality. If the bytes are equal, EAX contains |
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272 | # 0. |
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273 | # |
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274 | SRC=12 |
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275 | DST=16 |
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276 | CNT=20 |
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277 | memcmp: |
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316 | jermar | 278 | push %esi |
279 | push %edi |
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132 | vana | 280 | |
316 | jermar | 281 | movl CNT(%esp),%ecx |
282 | movl DST(%esp),%edi |
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283 | movl SRC(%esp),%esi |
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132 | vana | 284 | |
285 | repe cmpsb %es:(%edi),%ds:(%esi) |
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316 | jermar | 286 | movl %ecx,%eax # %ecx contains the return value (zero on success) |
132 | vana | 287 | |
316 | jermar | 288 | pop %edi |
289 | pop %esi |
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132 | vana | 290 | |
291 | ret |
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292 | |||
293 | |||
294 | # THIS IS USERSPACE CODE |
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295 | .global utext |
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296 | utext: |
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316 | jermar | 297 | xor %ax,%ax |
298 | mov %ax,%ds |
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299 | mov %ax,%es |
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300 | mov %ax,%fs |
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301 | mov %ax,%gs |
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132 | vana | 302 | 0: |
168 | jermar | 303 | int $48 |
132 | vana | 304 | jmp 0b |
305 | # not reached |
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306 | utext_end: |
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307 | |||
308 | .data |
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309 | .global utext_size |
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310 | utext_size: |
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311 | .long utext_end - utext |
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312 | |||
313 | .global interrupt_handler_size |
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314 | |||
315 | interrupt_handler_size: .long (h_end-h_start)/IDT_ITEMS |