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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 | |||
65 | decky | 29 | ## very low and hardware-level functions |
1 | jermar | 30 | |
31 | .text |
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32 | |||
33 | .global cpu_halt |
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34 | .global cpu_sleep |
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35 | .global paging_on |
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36 | .global enable_l_apic_in_msr |
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37 | .global interrupt_handlers |
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38 | .global inb |
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39 | .global inw |
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40 | .global inl |
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41 | .global outb |
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42 | .global outw |
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43 | .global outl |
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44 | .global memcopy |
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45 | .global memsetb |
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46 | .global memsetw |
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47 | .global memcmp |
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48 | |||
65 | decky | 49 | |
50 | ## Turn paging on |
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51 | # |
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52 | # Enable paging and write-back caching in CR0. |
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53 | # |
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1 | jermar | 54 | paging_on: |
55 | pushl %eax |
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56 | movl %cr0,%eax |
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57 | orl $(1<<31),%eax # paging on |
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58 | andl $~((1<<30)|(1<<29)),%eax # clear Cache Disable and not Write Though |
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59 | movl %eax,%cr0 |
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60 | jmp 0f |
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61 | 0: |
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62 | popl %eax |
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63 | ret |
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64 | |||
65 | decky | 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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1 | jermar | 70 | enable_l_apic_in_msr: |
71 | pusha |
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72 | |||
73 | movl $0x1b, %ecx |
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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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78 | |||
79 | popa |
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80 | ret |
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81 | |||
65 | decky | 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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1 | jermar | 91 | .macro handler i n |
92 | push %ebp |
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93 | movl %esp,%ebp |
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94 | pusha |
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26 | jermar | 95 | |
96 | push %ds |
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97 | push %es |
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125 | jermar | 98 | |
1 | jermar | 99 | # we must fill the data segment registers |
100 | movw $16,%ax |
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101 | movw %ax,%ds |
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102 | movw %ax,%es |
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125 | jermar | 103 | |
1 | jermar | 104 | movl $(\i),%edi |
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 | |||
26 | jermar | 111 | pop %es |
112 | pop %ds |
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113 | |||
1 | jermar | 114 | popa |
115 | pop %ebp |
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125 | jermar | 116 | |
117 | iret |
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118 | |||
1 | jermar | 119 | .if (\n-\i)-1 |
120 | handler "(\i+1)",\n |
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121 | .endif |
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122 | .endm |
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123 | |||
124 | # keep in sync with pm.h !!! |
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125 | IDT_ITEMS=64 |
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126 | interrupt_handlers: |
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127 | h_start: |
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128 | handler 0 64 |
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129 | # handler 64 128 |
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130 | # handler 128 192 |
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131 | # handler 192 256 |
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132 | h_end: |
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133 | |||
134 | |||
65 | decky | 135 | ## I/O input (byte) |
136 | # |
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137 | # Get a byte from I/O port and store it AL. |
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138 | # |
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1 | jermar | 139 | inb: |
140 | push %edx |
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141 | xorl %eax,%eax |
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142 | movl 8(%esp),%edx |
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143 | inb %dx,%al |
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144 | pop %edx |
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145 | ret |
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146 | |||
65 | decky | 147 | |
148 | ## I/O input (word) |
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149 | # |
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150 | # Get a word from I/O port and store it AX. |
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151 | # |
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1 | jermar | 152 | inw: |
153 | push %edx |
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154 | xorl %eax,%eax |
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155 | movl 8(%esp),%edx |
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156 | inw %dx,%ax |
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157 | pop %edx |
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158 | ret |
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159 | |||
65 | decky | 160 | |
161 | ## I/O input (dword) |
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162 | # |
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163 | # Get a dword from I/O port and store it EAX. |
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164 | # |
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1 | jermar | 165 | inl: |
166 | push %edx |
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167 | xorl %eax,%eax |
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168 | movl 8(%esp),%edx |
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169 | inl %dx,%eax |
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170 | pop %edx |
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171 | ret |
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172 | |||
65 | decky | 173 | |
174 | ## I/O output (byte) |
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175 | # |
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176 | # Send a byte to I/O port. |
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177 | # |
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1 | jermar | 178 | outb: |
179 | push %ebp |
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180 | movl %esp,%ebp |
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181 | pusha |
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125 | jermar | 182 | |
1 | jermar | 183 | movl 8(%ebp),%edx |
184 | movl 12(%ebp),%eax |
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185 | outb %al,%dx |
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125 | jermar | 186 | |
1 | jermar | 187 | popa |
188 | pop %ebp |
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189 | ret |
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190 | |||
65 | decky | 191 | |
192 | ## I/O output (word) |
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193 | # |
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194 | # Send a word to I/O port. |
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195 | # |
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1 | jermar | 196 | outw: |
197 | push %ebp |
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198 | movl %esp,%ebp |
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199 | pusha |
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125 | jermar | 200 | |
1 | jermar | 201 | movl 8(%ebp),%edx |
202 | movl 12(%ebp),%eax |
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203 | outw %ax,%dx |
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125 | jermar | 204 | |
1 | jermar | 205 | popa |
206 | pop %ebp |
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207 | ret |
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208 | |||
65 | decky | 209 | |
210 | ## I/O output (dword) |
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211 | # |
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212 | # Send a dword to I/O port. |
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213 | # |
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1 | jermar | 214 | outl: |
215 | push %ebp |
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216 | movl %esp,%ebp |
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217 | pusha |
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125 | jermar | 218 | |
1 | jermar | 219 | movl 8(%ebp),%edx |
220 | movl 12(%ebp),%eax |
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221 | outl %eax,%dx |
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125 | jermar | 222 | |
1 | jermar | 223 | popa |
224 | pop %ebp |
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225 | ret |
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226 | |||
65 | decky | 227 | |
228 | ## Copy memory |
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229 | # |
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230 | # Copy a given number of bytes (3rd argument) |
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231 | # from the memory location defined by 1st argument |
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232 | # to the memory location defined by 2nd argument. |
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233 | # The memory areas cannot overlap. |
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234 | # |
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1 | jermar | 235 | SRC=8 |
236 | DST=12 |
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237 | CNT=16 |
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238 | memcopy: |
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239 | push %ebp |
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240 | movl %esp,%ebp |
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241 | pusha |
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125 | jermar | 242 | |
1 | jermar | 243 | cld |
244 | movl CNT(%ebp),%ecx |
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245 | movl DST(%ebp),%edi |
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125 | jermar | 246 | movl SRC(%ebp),%esi |
247 | |||
1 | jermar | 248 | rep movsb %ds:(%esi),%es:(%edi) |
125 | jermar | 249 | |
1 | jermar | 250 | popa |
251 | pop %ebp |
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252 | ret |
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253 | |||
65 | decky | 254 | |
255 | ## Fill memory with bytes |
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256 | # |
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257 | # Fill a given number of bytes (2nd argument) |
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258 | # at memory defined by 1st argument with the |
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259 | # byte value defined by 3rd argument. |
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260 | # |
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1 | jermar | 261 | DST=8 |
262 | CNT=12 |
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263 | X=16 |
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65 | decky | 264 | memsetb: |
1 | jermar | 265 | push %ebp |
266 | movl %esp,%ebp |
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267 | pusha |
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125 | jermar | 268 | |
1 | jermar | 269 | cld |
270 | movl CNT(%ebp),%ecx |
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271 | movl DST(%ebp),%edi |
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272 | movl X(%ebp),%eax |
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125 | jermar | 273 | |
65 | decky | 274 | rep stosb %al,%es:(%edi) |
125 | jermar | 275 | |
276 | popa |
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1 | jermar | 277 | pop %ebp |
278 | ret |
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279 | |||
65 | decky | 280 | |
281 | ## Fill memory with words |
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282 | # |
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283 | # Fill a given number of words (2nd argument) |
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284 | # at memory defined by 1st argument with the |
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285 | # word value defined by 3rd argument. |
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286 | # |
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1 | jermar | 287 | DST=8 |
288 | CNT=12 |
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289 | X=16 |
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65 | decky | 290 | memsetw: |
1 | jermar | 291 | push %ebp |
292 | movl %esp,%ebp |
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293 | pusha |
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125 | jermar | 294 | |
1 | jermar | 295 | cld |
296 | movl CNT(%ebp),%ecx |
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297 | movl DST(%ebp),%edi |
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298 | movl X(%ebp),%eax |
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125 | jermar | 299 | |
65 | decky | 300 | rep stosw %ax,%es:(%edi) |
125 | jermar | 301 | |
302 | popa |
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1 | jermar | 303 | pop %ebp |
304 | ret |
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305 | |||
65 | decky | 306 | |
307 | ## Compare memory regions for equality |
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308 | # |
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309 | # Compare a given number of bytes (3rd argument) |
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310 | # at memory locations defined by 1st and 2nd argument |
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311 | # for equality. If the bytes are equal, EAX contains |
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312 | # 0. |
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313 | # |
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1 | jermar | 314 | SRC=12 |
315 | DST=16 |
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316 | CNT=20 |
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317 | memcmp: |
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318 | push %ebp |
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319 | subl $4,%esp |
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320 | movl %esp,%ebp |
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321 | |||
322 | pusha |
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125 | jermar | 323 | |
1 | jermar | 324 | cld |
325 | movl CNT(%ebp),%ecx |
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326 | movl DST(%ebp),%edi |
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125 | jermar | 327 | movl SRC(%ebp),%esi |
328 | |||
1 | jermar | 329 | repe cmpsb %es:(%edi),%ds:(%esi) |
330 | movl %ecx,(%ebp) |
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331 | |||
332 | popa |
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333 | |||
334 | movl (%ebp),%eax # return value => %eax (zero on success) |
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335 | addl $4,%esp |
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336 | pop %ebp |
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337 | |||
338 | ret |
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339 | |||
340 | |||
341 | # THIS IS USERSPACE CODE |
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342 | .global utext |
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343 | utext: |
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344 | 0: |
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26 | jermar | 345 | # movl $0xdeadbeaf, %eax |
1 | jermar | 346 | int $48 |
347 | jmp 0b |
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348 | # not reached |
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349 | utext_end: |
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350 | |||
351 | .data |
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352 | .global utext_size |
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353 | utext_size: |
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354 | .long utext_end - utext |
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355 | |||
356 | |||
106 | jermar | 357 | #.section K_DATA_START |
1 | jermar | 358 | .global interrupt_handler_size |
359 | |||
360 | interrupt_handler_size: .long (h_end-h_start)/IDT_ITEMS |