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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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205 | jermar | 46 | .global memcpy |
132 | vana | 47 | .global memsetb |
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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316 | jermar | 57 | movl %cr0,%edx |
58 | orl $(1<<31),%edx # paging on |
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59 | andl $~((1<<30)|(1<<29)),%edx # clear Cache Disable and not Write Though |
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60 | movl %edx,%cr0 |
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132 | vana | 61 | jmp 0f |
62 | 0: |
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63 | ret |
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64 | |||
65 | |||
66 | ## Enable local APIC |
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67 | # |
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68 | # Enable local APIC in MSR. |
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69 | # |
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70 | enable_l_apic_in_msr: |
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316 | jermar | 71 | push %eax |
72 | |||
132 | vana | 73 | movl $0x1b, %ecx |
74 | rdmsr |
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75 | orl $(1<<11),%eax |
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76 | orl $(0xfee00000),%eax |
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77 | wrmsr |
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316 | jermar | 78 | |
79 | pop %eax |
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132 | vana | 80 | ret |
81 | |||
82 | |||
83 | ## Declare interrupt handlers |
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84 | # |
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85 | # Declare interrupt handlers for n interrupt |
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86 | # vectors starting at vector i. |
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87 | # |
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88 | # The handlers setup data segment registers |
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89 | # and call trap_dispatcher(). |
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90 | # |
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91 | .macro handler i n |
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92 | push %ebp |
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93 | movl %esp,%ebp |
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94 | pusha |
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95 | |||
96 | push %ds |
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97 | push %es |
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98 | |||
99 | # we must fill the data segment registers |
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100 | movw $16,%ax |
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101 | movw %ax,%ds |
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102 | movw %ax,%es |
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103 | |||
104 | movl $(\i),%edi |
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105 | pushl %ebp |
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106 | addl $4,(%esp) |
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107 | pushl %edi |
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108 | call trap_dispatcher |
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109 | addl $8,%esp |
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110 | |||
111 | pop %es |
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112 | pop %ds |
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113 | |||
137 | vana | 114 | |
141 | vana | 115 | # CLNT |
316 | jermar | 116 | pushfl |
117 | pop %eax |
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118 | and $0xFFFFBFFF,%eax |
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119 | push %eax |
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120 | popfl |
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141 | vana | 121 | |
122 | |||
123 | |||
137 | vana | 124 | # Test if this is interrupt with error word or not |
316 | jermar | 125 | mov $\i,%cl |
126 | movl $1,%eax |
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127 | test $0xe0,%cl |
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128 | jnz 0f |
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129 | and $0x1f,%cl |
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130 | shl %cl,%eax |
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131 | and $ERROR_WORD_INTERRUPT_LIST,%eax |
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132 | jz 0f |
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132 | vana | 133 | |
137 | vana | 134 | |
135 | # Return with error word |
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316 | jermar | 136 | popa |
137 | pop %ebp |
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138 | add $4,%esp # Skip error word |
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139 | iret |
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132 | vana | 140 | |
141 | 0: |
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137 | vana | 142 | # Return with no error word |
132 | vana | 143 | popa |
144 | pop %ebp |
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145 | iret |
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146 | |||
147 | .if (\n-\i)-1 |
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148 | handler "(\i+1)",\n |
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149 | .endif |
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150 | .endm |
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151 | |||
152 | # keep in sync with pm.h !!! |
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153 | IDT_ITEMS=64 |
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154 | interrupt_handlers: |
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155 | h_start: |
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156 | handler 0 64 |
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157 | # handler 64 128 |
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158 | # handler 128 192 |
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159 | # handler 192 256 |
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160 | h_end: |
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161 | |||
162 | |||
163 | ## I/O input (byte) |
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164 | # |
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165 | # Get a byte from I/O port and store it AL. |
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166 | # |
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167 | inb: |
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168 | xorl %eax,%eax |
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316 | jermar | 169 | movl 4(%esp),%edx |
132 | vana | 170 | inb %dx,%al |
171 | ret |
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172 | |||
173 | |||
174 | ## I/O input (word) |
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175 | # |
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176 | # Get a word from I/O port and store it AX. |
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177 | # |
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178 | inw: |
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179 | xorl %eax,%eax |
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316 | jermar | 180 | movl 4(%esp),%edx |
132 | vana | 181 | inw %dx,%ax |
182 | ret |
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183 | |||
184 | |||
185 | ## I/O input (dword) |
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186 | # |
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187 | # Get a dword from I/O port and store it EAX. |
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188 | # |
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189 | inl: |
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190 | xorl %eax,%eax |
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316 | jermar | 191 | movl 4(%esp),%edx |
132 | vana | 192 | inl %dx,%eax |
193 | ret |
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194 | |||
195 | |||
196 | ## I/O output (byte) |
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197 | # |
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198 | # Send a byte to I/O port. |
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199 | # |
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200 | outb: |
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316 | jermar | 201 | push %eax |
132 | vana | 202 | |
316 | jermar | 203 | movl 8(%esp),%edx |
204 | movl 12(%esp),%eax |
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132 | vana | 205 | outb %al,%dx |
206 | |||
316 | jermar | 207 | pop %eax |
132 | vana | 208 | ret |
209 | |||
210 | |||
211 | ## I/O output (word) |
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212 | # |
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213 | # Send a word to I/O port. |
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214 | # |
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215 | outw: |
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316 | jermar | 216 | push %eax |
132 | vana | 217 | |
316 | jermar | 218 | movl 8(%esp),%edx |
219 | movl 12(%esp),%eax |
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132 | vana | 220 | outw %ax,%dx |
221 | |||
316 | jermar | 222 | pop %eax |
132 | vana | 223 | ret |
224 | |||
225 | |||
226 | ## I/O output (dword) |
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227 | # |
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228 | # Send a dword to I/O port. |
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229 | # |
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230 | outl: |
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316 | jermar | 231 | push %eax |
132 | vana | 232 | |
316 | jermar | 233 | movl 8(%esp),%edx |
234 | movl 12(%esp),%eax |
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132 | vana | 235 | outl %eax,%dx |
236 | |||
316 | jermar | 237 | pop %eax |
132 | vana | 238 | ret |
239 | |||
240 | |||
241 | ## Copy memory |
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242 | # |
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243 | # Copy a given number of bytes (3rd argument) |
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198 | jermar | 244 | # from the memory location defined by 2nd argument |
245 | # to the memory location defined by 1st argument. |
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132 | vana | 246 | # The memory areas cannot overlap. |
247 | # |
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316 | jermar | 248 | SRC=16 |
249 | DST=12 |
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250 | CNT=20 |
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205 | jermar | 251 | memcpy: |
316 | jermar | 252 | push %esi |
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 SRC(%esp),%esi |
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132 | vana | 258 | |
259 | rep movsb %ds:(%esi),%es:(%edi) |
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260 | |||
316 | jermar | 261 | pop %edi |
262 | pop %esi |
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132 | vana | 263 | ret |
264 | |||
265 | |||
266 | ## Fill memory with bytes |
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267 | # |
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268 | # Fill a given number of bytes (2nd argument) |
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269 | # at memory defined by 1st argument with the |
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270 | # byte value defined by 3rd argument. |
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271 | # |
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316 | jermar | 272 | DST=12 |
273 | CNT=16 |
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274 | X=20 |
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132 | vana | 275 | memsetb: |
316 | jermar | 276 | push %eax |
277 | push %edi |
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132 | vana | 278 | |
316 | jermar | 279 | movl CNT(%esp),%ecx |
280 | movl DST(%esp),%edi |
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281 | movl X(%esp),%eax |
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132 | vana | 282 | |
283 | rep stosb %al,%es:(%edi) |
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284 | |||
316 | jermar | 285 | pop %edi |
286 | pop %eax |
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132 | vana | 287 | ret |
288 | |||
289 | |||
290 | ## Fill memory with words |
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291 | # |
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292 | # Fill a given number of words (2nd argument) |
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293 | # at memory defined by 1st argument with the |
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294 | # word value defined by 3rd argument. |
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295 | # |
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316 | jermar | 296 | DST=12 |
297 | CNT=16 |
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298 | X=20 |
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132 | vana | 299 | memsetw: |
316 | jermar | 300 | push %eax |
301 | push %edi |
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132 | vana | 302 | |
316 | jermar | 303 | movl CNT(%esp),%ecx |
304 | movl DST(%esp),%edi |
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305 | movl X(%esp),%eax |
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132 | vana | 306 | |
307 | rep stosw %ax,%es:(%edi) |
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308 | |||
316 | jermar | 309 | pop %edi |
310 | pop %eax |
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311 | |||
132 | vana | 312 | ret |
313 | |||
314 | |||
315 | ## Compare memory regions for equality |
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316 | # |
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317 | # Compare a given number of bytes (3rd argument) |
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318 | # at memory locations defined by 1st and 2nd argument |
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319 | # for equality. If the bytes are equal, EAX contains |
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320 | # 0. |
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321 | # |
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322 | SRC=12 |
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323 | DST=16 |
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324 | CNT=20 |
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325 | memcmp: |
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316 | jermar | 326 | push %esi |
327 | push %edi |
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132 | vana | 328 | |
316 | jermar | 329 | movl CNT(%esp),%ecx |
330 | movl DST(%esp),%edi |
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331 | movl SRC(%esp),%esi |
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132 | vana | 332 | |
333 | repe cmpsb %es:(%edi),%ds:(%esi) |
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316 | jermar | 334 | movl %ecx,%eax # %ecx contains the return value (zero on success) |
132 | vana | 335 | |
316 | jermar | 336 | pop %edi |
337 | pop %esi |
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132 | vana | 338 | |
339 | ret |
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340 | |||
341 | |||
342 | # THIS IS USERSPACE CODE |
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343 | .global utext |
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344 | utext: |
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316 | jermar | 345 | xor %ax,%ax |
346 | mov %ax,%ds |
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347 | mov %ax,%es |
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348 | mov %ax,%fs |
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349 | mov %ax,%gs |
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132 | vana | 350 | 0: |
168 | jermar | 351 | int $48 |
132 | vana | 352 | jmp 0b |
353 | # not reached |
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354 | utext_end: |
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355 | |||
356 | .data |
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357 | .global utext_size |
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358 | utext_size: |
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359 | .long utext_end - utext |
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360 | |||
361 | |||
362 | #.section K_DATA_START |
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363 | .global interrupt_handler_size |
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364 | |||
365 | interrupt_handler_size: .long (h_end-h_start)/IDT_ITEMS |