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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_priority_high |
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34 | .global cpu_priority_low |
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35 | .global cpu_priority_restore |
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36 | .global cpu_priority_read |
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37 | .global cpu_halt |
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38 | .global cpu_sleep |
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39 | .global paging_on |
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40 | .global cpu_read_dba |
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41 | .global cpu_write_dba |
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42 | .global cpu_read_cr2 |
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43 | .global enable_l_apic_in_msr |
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44 | .global interrupt_handlers |
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45 | .global inb |
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46 | .global inw |
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47 | .global inl |
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48 | .global outb |
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49 | .global outw |
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50 | .global outl |
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51 | .global memcopy |
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52 | .global memsetb |
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53 | .global memsetw |
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54 | .global memcmp |
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55 | |||
65 | decky | 56 | |
57 | ## Set priority level high |
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1 | jermar | 58 | # |
65 | decky | 59 | # Disable interrupts and return previous |
60 | # EFLAGS in EAX. |
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61 | # |
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1 | jermar | 62 | cpu_priority_high: |
63 | pushf |
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64 | pop %eax |
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65 | cli |
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66 | ret |
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65 | decky | 67 | |
68 | |||
69 | ## Set priority level low |
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1 | jermar | 70 | # |
65 | decky | 71 | # Enable interrupts and return previous |
72 | # EFLAGS in EAX. |
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73 | # |
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1 | jermar | 74 | cpu_priority_low: |
75 | pushf |
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76 | pop %eax |
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77 | sti |
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78 | ret |
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79 | |||
65 | decky | 80 | |
81 | ## Restore priority level |
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1 | jermar | 82 | # |
65 | decky | 83 | # Restore EFLAGS. |
84 | # |
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1 | jermar | 85 | cpu_priority_restore: |
86 | push 4(%esp) |
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87 | popf |
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88 | ret |
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89 | |||
65 | decky | 90 | ## Return raw priority level |
91 | # |
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92 | # Return EFLAFS in EAX. |
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93 | # |
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1 | jermar | 94 | cpu_priority_read: |
95 | pushf |
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96 | pop %eax |
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97 | ret |
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98 | |||
65 | decky | 99 | |
100 | ## Halt the CPU |
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101 | # |
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102 | # Halt the CPU using HLT. |
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103 | # |
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1 | jermar | 104 | cpu_halt: |
105 | cpu_sleep: |
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106 | hlt |
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107 | ret |
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108 | |||
65 | decky | 109 | |
110 | ## Turn paging on |
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111 | # |
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112 | # Enable paging and write-back caching in CR0. |
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113 | # |
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1 | jermar | 114 | paging_on: |
115 | pushl %eax |
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116 | movl %cr0,%eax |
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117 | orl $(1<<31),%eax # paging on |
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118 | andl $~((1<<30)|(1<<29)),%eax # clear Cache Disable and not Write Though |
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119 | movl %eax,%cr0 |
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120 | jmp 0f |
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121 | 0: |
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122 | popl %eax |
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123 | ret |
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124 | |||
65 | decky | 125 | |
126 | ## Read CR3 |
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127 | # |
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128 | # Store CR3 in EAX. |
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129 | # |
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1 | jermar | 130 | cpu_read_dba: |
131 | movl %cr3,%eax |
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132 | ret |
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133 | |||
65 | decky | 134 | |
135 | ## Write CR3 |
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136 | # |
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137 | # Set CR3. |
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138 | # |
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1 | jermar | 139 | cpu_write_dba: |
140 | pushl %eax |
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141 | movl 8(%esp),%eax |
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142 | movl %eax,%cr3 |
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143 | popl %eax |
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144 | ret |
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145 | |||
65 | decky | 146 | |
147 | ## Read CR2 |
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148 | # |
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149 | # Store CR2 in EAX. |
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150 | # |
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1 | jermar | 151 | cpu_read_cr2: |
152 | movl %cr2,%eax |
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153 | ret |
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154 | |||
65 | decky | 155 | |
156 | ## Enable local APIC |
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157 | # |
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158 | # Enable local APIC in MSR. |
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159 | # |
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1 | jermar | 160 | enable_l_apic_in_msr: |
161 | pusha |
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162 | |||
163 | movl $0x1b, %ecx |
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164 | rdmsr |
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165 | orl $(1<<11),%eax |
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166 | orl $(0xfee00000),%eax |
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167 | wrmsr |
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168 | |||
169 | popa |
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170 | ret |
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171 | |||
65 | decky | 172 | |
173 | ## Declare interrupt handlers |
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174 | # |
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175 | # Declare interrupt handlers for n interrupt |
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176 | # vectors starting at vector i. |
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177 | # |
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178 | # The handlers setup data segment registers |
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179 | # and call trap_dispatcher(). |
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180 | # |
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1 | jermar | 181 | .macro handler i n |
182 | push %ebp |
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183 | movl %esp,%ebp |
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184 | pusha |
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26 | jermar | 185 | |
186 | push %ds |
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187 | push %es |
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1 | jermar | 188 | |
189 | # we must fill the data segment registers |
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190 | movw $16,%ax |
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191 | movw %ax,%ds |
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192 | movw %ax,%es |
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193 | |||
194 | movl $(\i),%edi |
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195 | pushl %ebp |
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196 | addl $4,(%esp) |
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197 | pushl %edi |
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198 | call trap_dispatcher |
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199 | addl $8,%esp |
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200 | |||
26 | jermar | 201 | pop %es |
202 | pop %ds |
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203 | |||
1 | jermar | 204 | popa |
205 | pop %ebp |
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206 | |||
207 | iret |
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208 | |||
209 | .if (\n-\i)-1 |
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210 | handler "(\i+1)",\n |
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211 | .endif |
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212 | .endm |
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213 | |||
214 | # keep in sync with pm.h !!! |
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215 | IDT_ITEMS=64 |
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216 | interrupt_handlers: |
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217 | h_start: |
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218 | handler 0 64 |
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219 | # handler 64 128 |
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220 | # handler 128 192 |
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221 | # handler 192 256 |
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222 | h_end: |
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223 | |||
224 | |||
65 | decky | 225 | ## I/O input (byte) |
226 | # |
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227 | # Get a byte from I/O port and store it AL. |
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228 | # |
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1 | jermar | 229 | inb: |
230 | push %edx |
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231 | xorl %eax,%eax |
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232 | movl 8(%esp),%edx |
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233 | inb %dx,%al |
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234 | pop %edx |
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235 | ret |
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236 | |||
65 | decky | 237 | |
238 | ## I/O input (word) |
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239 | # |
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240 | # Get a word from I/O port and store it AX. |
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241 | # |
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1 | jermar | 242 | inw: |
243 | push %edx |
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244 | xorl %eax,%eax |
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245 | movl 8(%esp),%edx |
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246 | inw %dx,%ax |
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247 | pop %edx |
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248 | ret |
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249 | |||
65 | decky | 250 | |
251 | ## I/O input (dword) |
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252 | # |
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253 | # Get a dword from I/O port and store it EAX. |
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254 | # |
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1 | jermar | 255 | inl: |
256 | push %edx |
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257 | xorl %eax,%eax |
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258 | movl 8(%esp),%edx |
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259 | inl %dx,%eax |
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260 | pop %edx |
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261 | ret |
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262 | |||
65 | decky | 263 | |
264 | ## I/O output (byte) |
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265 | # |
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266 | # Send a byte to I/O port. |
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267 | # |
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1 | jermar | 268 | outb: |
269 | push %ebp |
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270 | movl %esp,%ebp |
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271 | pusha |
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272 | |||
273 | movl 8(%ebp),%edx |
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274 | movl 12(%ebp),%eax |
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275 | outb %al,%dx |
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276 | |||
277 | popa |
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278 | pop %ebp |
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279 | ret |
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280 | |||
65 | decky | 281 | |
282 | ## I/O output (word) |
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283 | # |
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284 | # Send a word to I/O port. |
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285 | # |
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1 | jermar | 286 | outw: |
287 | push %ebp |
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288 | movl %esp,%ebp |
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289 | pusha |
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290 | |||
291 | movl 8(%ebp),%edx |
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292 | movl 12(%ebp),%eax |
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293 | outw %ax,%dx |
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294 | |||
295 | popa |
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296 | pop %ebp |
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297 | ret |
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298 | |||
65 | decky | 299 | |
300 | ## I/O output (dword) |
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301 | # |
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302 | # Send a dword to I/O port. |
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303 | # |
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1 | jermar | 304 | outl: |
305 | push %ebp |
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306 | movl %esp,%ebp |
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307 | pusha |
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308 | |||
309 | movl 8(%ebp),%edx |
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310 | movl 12(%ebp),%eax |
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311 | outl %eax,%dx |
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312 | |||
313 | popa |
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314 | pop %ebp |
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315 | ret |
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316 | |||
65 | decky | 317 | |
318 | ## Copy memory |
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319 | # |
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320 | # Copy a given number of bytes (3rd argument) |
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321 | # from the memory location defined by 1st argument |
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322 | # to the memory location defined by 2nd argument. |
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323 | # The memory areas cannot overlap. |
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324 | # |
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1 | jermar | 325 | SRC=8 |
326 | DST=12 |
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327 | CNT=16 |
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328 | memcopy: |
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329 | push %ebp |
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330 | movl %esp,%ebp |
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331 | pusha |
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332 | |||
333 | cld |
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334 | movl CNT(%ebp),%ecx |
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335 | movl DST(%ebp),%edi |
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336 | movl SRC(%ebp),%esi |
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337 | |||
338 | rep movsb %ds:(%esi),%es:(%edi) |
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339 | |||
340 | popa |
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341 | pop %ebp |
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342 | ret |
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343 | |||
65 | decky | 344 | |
345 | ## Fill memory with bytes |
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346 | # |
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347 | # Fill a given number of bytes (2nd argument) |
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348 | # at memory defined by 1st argument with the |
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349 | # byte value defined by 3rd argument. |
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350 | # |
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1 | jermar | 351 | DST=8 |
352 | CNT=12 |
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353 | X=16 |
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65 | decky | 354 | memsetb: |
1 | jermar | 355 | push %ebp |
356 | movl %esp,%ebp |
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357 | pusha |
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358 | |||
359 | cld |
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360 | movl CNT(%ebp),%ecx |
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361 | movl DST(%ebp),%edi |
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362 | movl X(%ebp),%eax |
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363 | |||
65 | decky | 364 | rep stosb %al,%es:(%edi) |
1 | jermar | 365 | |
366 | popa |
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367 | pop %ebp |
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368 | ret |
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369 | |||
65 | decky | 370 | |
371 | ## Fill memory with words |
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372 | # |
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373 | # Fill a given number of words (2nd argument) |
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374 | # at memory defined by 1st argument with the |
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375 | # word value defined by 3rd argument. |
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376 | # |
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1 | jermar | 377 | DST=8 |
378 | CNT=12 |
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379 | X=16 |
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65 | decky | 380 | memsetw: |
1 | jermar | 381 | push %ebp |
382 | movl %esp,%ebp |
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383 | pusha |
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384 | |||
385 | cld |
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386 | movl CNT(%ebp),%ecx |
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387 | movl DST(%ebp),%edi |
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388 | movl X(%ebp),%eax |
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389 | |||
65 | decky | 390 | rep stosw %ax,%es:(%edi) |
1 | jermar | 391 | |
392 | popa |
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393 | pop %ebp |
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394 | ret |
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395 | |||
65 | decky | 396 | |
397 | ## Compare memory regions for equality |
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398 | # |
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399 | # Compare a given number of bytes (3rd argument) |
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400 | # at memory locations defined by 1st and 2nd argument |
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401 | # for equality. If the bytes are equal, EAX contains |
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402 | # 0. |
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403 | # |
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1 | jermar | 404 | SRC=12 |
405 | DST=16 |
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406 | CNT=20 |
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407 | memcmp: |
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408 | push %ebp |
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409 | subl $4,%esp |
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410 | movl %esp,%ebp |
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411 | |||
412 | pusha |
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413 | |||
414 | cld |
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415 | movl CNT(%ebp),%ecx |
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416 | movl DST(%ebp),%edi |
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417 | movl SRC(%ebp),%esi |
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418 | |||
419 | repe cmpsb %es:(%edi),%ds:(%esi) |
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420 | movl %ecx,(%ebp) |
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421 | |||
422 | popa |
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423 | |||
424 | movl (%ebp),%eax # return value => %eax (zero on success) |
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425 | addl $4,%esp |
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426 | pop %ebp |
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427 | |||
428 | ret |
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429 | |||
430 | |||
431 | # THIS IS USERSPACE CODE |
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432 | .global utext |
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433 | utext: |
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434 | 0: |
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26 | jermar | 435 | # movl $0xdeadbeaf, %eax |
1 | jermar | 436 | int $48 |
437 | jmp 0b |
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438 | # not reached |
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439 | utext_end: |
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440 | |||
441 | .data |
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442 | .global utext_size |
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443 | utext_size: |
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444 | .long utext_end - utext |
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445 | |||
446 | |||
447 | .section K_DATA_START |
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448 | .global interrupt_handler_size |
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449 | |||
450 | interrupt_handler_size: .long (h_end-h_start)/IDT_ITEMS |