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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 memsetb |
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41 | .global memsetw |
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42 | |||
43 | ## Turn paging on |
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44 | # |
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45 | # Enable paging and write-back caching in CR0. |
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46 | # |
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47 | paging_on: |
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316 | jermar | 48 | movl %cr0,%edx |
49 | orl $(1<<31),%edx # paging on |
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50 | andl $~((1<<30)|(1<<29)),%edx # clear Cache Disable and not Write Though |
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51 | movl %edx,%cr0 |
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132 | vana | 52 | jmp 0f |
53 | 0: |
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54 | ret |
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55 | |||
56 | |||
57 | ## Enable local APIC |
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58 | # |
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59 | # Enable local APIC in MSR. |
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60 | # |
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61 | enable_l_apic_in_msr: |
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316 | jermar | 62 | push %eax |
63 | |||
132 | vana | 64 | movl $0x1b, %ecx |
65 | rdmsr |
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66 | orl $(1<<11),%eax |
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67 | orl $(0xfee00000),%eax |
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68 | wrmsr |
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316 | jermar | 69 | |
70 | pop %eax |
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132 | vana | 71 | ret |
72 | |||
73 | |||
74 | ## Declare interrupt handlers |
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75 | # |
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76 | # Declare interrupt handlers for n interrupt |
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77 | # vectors starting at vector i. |
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78 | # |
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79 | # The handlers setup data segment registers |
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80 | # and call trap_dispatcher(). |
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81 | # |
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82 | .macro handler i n |
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83 | push %ebp |
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84 | movl %esp,%ebp |
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85 | pusha |
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86 | |||
87 | push %ds |
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88 | push %es |
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89 | |||
90 | # we must fill the data segment registers |
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91 | movw $16,%ax |
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92 | movw %ax,%ds |
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93 | movw %ax,%es |
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94 | |||
95 | movl $(\i),%edi |
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96 | pushl %ebp |
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97 | addl $4,(%esp) |
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98 | pushl %edi |
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99 | call trap_dispatcher |
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100 | addl $8,%esp |
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101 | |||
102 | pop %es |
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103 | pop %ds |
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104 | |||
137 | vana | 105 | |
141 | vana | 106 | # CLNT |
316 | jermar | 107 | pushfl |
108 | pop %eax |
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109 | and $0xFFFFBFFF,%eax |
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110 | push %eax |
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111 | popfl |
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141 | vana | 112 | |
113 | |||
114 | |||
137 | vana | 115 | # Test if this is interrupt with error word or not |
316 | jermar | 116 | mov $\i,%cl |
117 | movl $1,%eax |
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118 | test $0xe0,%cl |
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119 | jnz 0f |
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120 | and $0x1f,%cl |
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121 | shl %cl,%eax |
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122 | and $ERROR_WORD_INTERRUPT_LIST,%eax |
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123 | jz 0f |
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132 | vana | 124 | |
137 | vana | 125 | |
126 | # Return with error word |
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316 | jermar | 127 | popa |
128 | pop %ebp |
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129 | add $4,%esp # Skip error word |
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130 | iret |
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132 | vana | 131 | |
132 | 0: |
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137 | vana | 133 | # Return with no error word |
132 | vana | 134 | popa |
135 | pop %ebp |
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136 | iret |
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137 | |||
138 | .if (\n-\i)-1 |
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139 | handler "(\i+1)",\n |
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140 | .endif |
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141 | .endm |
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142 | |||
143 | # keep in sync with pm.h !!! |
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144 | IDT_ITEMS=64 |
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145 | interrupt_handlers: |
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146 | h_start: |
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147 | handler 0 64 |
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148 | # handler 64 128 |
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149 | # handler 128 192 |
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150 | # handler 192 256 |
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151 | h_end: |
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152 | |||
153 | |||
154 | ## Fill memory with bytes |
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155 | # |
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156 | # Fill a given number of bytes (2nd argument) |
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157 | # at memory defined by 1st argument with the |
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158 | # byte value defined by 3rd argument. |
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159 | # |
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316 | jermar | 160 | DST=12 |
161 | CNT=16 |
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162 | X=20 |
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132 | vana | 163 | memsetb: |
316 | jermar | 164 | push %eax |
165 | push %edi |
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132 | vana | 166 | |
316 | jermar | 167 | movl CNT(%esp),%ecx |
168 | movl DST(%esp),%edi |
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169 | movl X(%esp),%eax |
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132 | vana | 170 | |
171 | rep stosb %al,%es:(%edi) |
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172 | |||
316 | jermar | 173 | pop %edi |
174 | pop %eax |
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132 | vana | 175 | ret |
176 | |||
177 | |||
178 | ## Fill memory with words |
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179 | # |
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180 | # Fill a given number of words (2nd argument) |
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181 | # at memory defined by 1st argument with the |
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182 | # word value defined by 3rd argument. |
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183 | # |
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316 | jermar | 184 | DST=12 |
185 | CNT=16 |
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186 | X=20 |
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132 | vana | 187 | memsetw: |
316 | jermar | 188 | push %eax |
189 | push %edi |
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132 | vana | 190 | |
316 | jermar | 191 | movl CNT(%esp),%ecx |
192 | movl DST(%esp),%edi |
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193 | movl X(%esp),%eax |
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132 | vana | 194 | |
195 | rep stosw %ax,%es:(%edi) |
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196 | |||
316 | jermar | 197 | pop %edi |
198 | pop %eax |
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199 | |||
132 | vana | 200 | ret |
201 | |||
202 | |||
203 | # THIS IS USERSPACE CODE |
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204 | .global utext |
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205 | utext: |
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316 | jermar | 206 | xor %ax,%ax |
207 | mov %ax,%ds |
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208 | mov %ax,%es |
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209 | mov %ax,%fs |
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210 | mov %ax,%gs |
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132 | vana | 211 | 0: |
168 | jermar | 212 | int $48 |
132 | vana | 213 | jmp 0b |
214 | # not reached |
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215 | utext_end: |
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216 | |||
217 | .data |
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218 | .global utext_size |
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219 | utext_size: |
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220 | .long utext_end - utext |
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221 | |||
222 | .global interrupt_handler_size |
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223 | |||
224 | interrupt_handler_size: .long (h_end-h_start)/IDT_ITEMS |