kernel/arch/x86_64/int.s

   1 ;  ZeX/OS
   2 ;  Copyright (C) 2007  Tomas 'ZeXx86' Jedrzejek (zexx86@gmail.com)
   3 ;  Copyright (C) 2008  Tomas 'ZeXx86' Jedrzejek (zexx86@gmail.com)
   4 ;
   5 ;  This program is free software: you can redistribute it and/or modify
   6 ;  it under the terms of the GNU General Public License as published by
   7 ;  the Free Software Foundation, either version 3 of the License, or
   8 ;  (at your option) any later version.
   9 ;
  10 ;  This program is distributed in the hope that it will be useful,
  11 ;  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 ;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 ;  GNU General Public License for more details.
  14 ;
  15 ;  You should have received a copy of the GNU General Public License
  16 ;  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18
  19 %macro  IMP 1
  20 %ifdef UNDERBARS
  21         EXTERN _%1
  22         %define %1 _%1
  23 %else
  24         EXTERN %1
  25 %endif
  26 %endmacro
  27
  28 %macro  EXP     1
  29         GLOBAL $_%1
  30         $_%1:
  31         GLOBAL $%1
  32         $%1:
  33 %endmacro
  34
  35 ; IMPORTS
  36 ; from KRNL.LD
  37 IMP bss
  38 IMP end
  39
  40 ; from MAIN.C
  41 IMP g_curr_thread
  42 IMP fault
  43 IMP main
  44
  45 [BITS 32]
  46 ; This will set up our new segment registers. We need to do
  47 ; something special in order to set CS. We do what is called a
  48 ; far jump. A jump that includes a segment as well as an offset.
  49 ; This is declared in C as 'extern void gdt_flush();'
  50 EXP gdt_flush     ; Allows the C code to link to this
  51 IMP gp            ; Says that '_gp' is in another file
  52 ;_gdt_flush:
  53     lgdt [gp]        ; Load the GDT with our '_gp' which is a special pointer
  54     mov ax, 0x10      ; 0x10 is the offset in the GDT to our data segment
  55     mov ds, ax
  56     mov es, ax
  57     mov fs, ax
  58     mov gs, ax
  59     jmp 0x08:flush2   ; 0x08 is the offset to our code segment: Far jump!
  60 flush2:
  61     ret               ; Returns back to the C code!
  62
  63 ; Loads the IDT defined in '_idtp' into the processor.
  64 ; This is declared in C as 'extern void idt_load();'
  65 EXP idt_load
  66 IMP idtp
  67     lidt [idtp]
  68     ret
  69
  70 ;  0: Divide By Zero Exception
  71 EXP isr0
  72     cli
  73     push byte 0
  74     push byte 0
  75     jmp isr_common_stub
  76
  77 ;  1: Debug Exception
  78 EXP isr1
  79     cli
  80     push byte 0
  81     push byte 1
  82     jmp isr_common_stub
  83
  84 ;  2: Non Maskable Interrupt Exception
  85 EXP isr2
  86     cli
  87     push byte 0
  88     push byte 2
  89     jmp isr_common_stub
  90
  91 ;  3: Int 3 Exception
  92 EXP isr3
  93     cli
  94     push byte 0
  95     push byte 3
  96     jmp isr_common_stub
  97
  98 ;  4: INTO Exception
  99 EXP isr4
 100     cli
 101     push byte 0
 102     push byte 4
 103     jmp isr_common_stub
 104
 105 ;  5: Out of Bounds Exception
 106 EXP isr5
 107     cli
 108     push byte 0
 109     push byte 5
 110     jmp isr_common_stub
 111
 112 ;  6: Invalid Opcode Exception
 113 EXP isr6
 114     cli
 115     push byte 0
 116     push byte 6
 117     jmp isr_common_stub
 118
 119 ;  7: Coprocessor Not Available Exception
 120 EXP isr7
 121     cli
 122     push byte 0
 123     push byte 7
 124     jmp isr_common_stub
 125
 126 ;  8: Double Fault Exception (With Error Code!)
 127 EXP isr8
 128     cli
 129     push byte 8
 130     jmp isr_common_stub
 131
 132 ;  9: Coprocessor Segment Overrun Exception
 133 EXP isr9
 134     cli
 135     push byte 0
 136     push byte 9
 137     jmp isr_common_stub
 138
 139 ; 10: Bad TSS Exception (With Error Code!)
 140 EXP isr10
 141     cli
 142     push byte 10
 143     jmp isr_common_stub
 144
 145 ; 11: Segment Not Present Exception (With Error Code!)
 146 EXP isr11
 147     cli
 148     push byte 11
 149     jmp isr_common_stub
 150
 151 ; 12: Stack Fault Exception (With Error Code!)
 152 EXP isr12
 153     cli
 154     push byte 12
 155     jmp isr_common_stub
 156
 157 ; 13: General Protection Fault Exception (With Error Code!)
 158 EXP isr13
 159     cli
 160     push byte 13
 161     jmp isr_common_stub
 162
 163 ; 14: Page Fault Exception (With Error Code!)
 164 EXP isr14
 165     cli
 166     push byte 14
 167     jmp isr_common_stub
 168
 169 ; 15: Reserved Exception
 170 EXP isr15
 171     cli
 172     push byte 0
 173     push byte 15
 174     jmp isr_common_stub
 175
 176 ; 16: Floating Point Exception
 177 EXP isr16
 178     cli
 179     push byte 0
 180     push byte 16
 181     jmp isr_common_stub
 182
 183 ; 17: Alignment Check Exception
 184 EXP isr17
 185     cli
 186     push byte 0
 187     push byte 17
 188     jmp isr_common_stub
 189
 190 ; 18: Machine Check Exception
 191 EXP isr18
 192     cli
 193     push byte 0
 194     push byte 18
 195     jmp isr_common_stub
 196
 197 ; 19: Reserved
 198 EXP isr19
 199     cli
 200     push byte 0
 201     push byte 19
 202     jmp isr_common_stub
 203
 204 ; 20: Reserved
 205 EXP isr20
 206     cli
 207     push byte 0
 208     push byte 20
 209     jmp isr_common_stub
 210
 211 ; 21: Reserved
 212 EXP isr21
 213     cli
 214     push byte 0
 215     push byte 21
 216     jmp isr_common_stub
 217
 218 ; 22: Reserved
 219 EXP isr22
 220     cli
 221     push byte 0
 222     push byte 22
 223     jmp isr_common_stub
 224
 225 ; 23: Reserved
 226 EXP isr23
 227     cli
 228     push byte 0
 229     push byte 23
 230     jmp isr_common_stub
 231
 232 ; 24: Reserved
 233 EXP isr24
 234     cli
 235     push byte 0
 236     push byte 24
 237     jmp isr_common_stub
 238
 239 ; 25: Reserved
 240 EXP isr25
 241     cli
 242     push byte 0
 243     push byte 25
 244     jmp isr_common_stub
 245
 246 ; 26: Reserved
 247 EXP isr26
 248     cli
 249     push byte 0
 250     push byte 26
 251     jmp isr_common_stub
 252
 253 ; 27: Reserved
 254 EXP isr27
 255     cli
 256     push byte 0
 257     push byte 27
 258     jmp isr_common_stub
 259
 260 ; 28: Reserved
 261 EXP isr28
 262     cli
 263     push byte 0
 264     push byte 28
 265     jmp isr_common_stub
 266
 267 ; 29: Reserved
 268 EXP isr29
 269     cli
 270     push byte 0
 271     push byte 29
 272     jmp isr_common_stub
 273
 274 ; 30: Reserved
 275 EXP isr30
 276     cli
 277     push byte 0
 278     push byte 30
 279     jmp isr_common_stub
 280
 281 ; 31: Reserved
 282 EXP isr31
 283     cli
 284     push byte 0
 285     push byte 31
 286     jmp isr_common_stub
 287
 288
 289 ; We call a C function in here. We need to let the assembler know
 290 ; that '_fault_handler' exists in another file
 291
 292
 293 ; This is our common ISR stub. It saves the processor state, sets
 294 ; up for kernel mode segments, calls the C-level fault handler,
 295 ; and finally restores the stack frame.
 296 isr_common_stub:
 297 IMP fault_handler
 298     pusha
 299     push ds
 300     push es
 301     push fs
 302     push gs
 303     mov ax, 0x10
 304     mov ds, ax
 305     mov es, ax
 306     mov fs, ax
 307     mov gs, ax
 308     mov eax, esp
 309     push eax
 310     mov eax, fault_handler
 311     call eax
 312     pop eax
 313     pop gs
 314     pop fs
 315     pop es
 316     pop ds
 317     popa
 318     add esp, 8
 319     iret
 320
 321 ;global _irq0
 322 ;global _irq1
 323 ;global _irq2
 324 ;global _irq3
 325 ;global _irq4
 326 ;global _irq5
 327 ;global _irq6
 328 ;global _irq7
 329 ;global _irq8
 330 ;global _irq9
 331 ;global _irq10
 332 ;global _irq11
 333 ;global _irq12
 334 ;global _irq13
 335 ;global _irq14
 336 ;global _irq15
 337
 338 ; 32: IRQ0
 339 EXP irq0
 340     cli
 341     push byte 0
 342     push byte 32
 343     jmp irq_common_stub
 344
 345 ; 33: IRQ1
 346 EXP irq1
 347     cli
 348     push byte 0
 349     push byte 33
 350     jmp irq_common_stub
 351
 352 ; 34: IRQ2
 353 EXP irq2
 354     cli
 355     push byte 0
 356     push byte 34
 357     jmp irq_common_stub
 358
 359 ; 35: IRQ3
 360 EXP irq3
 361     cli
 362     push byte 0
 363     push byte 35
 364     jmp irq_common_stub
 365
 366 ; 36: IRQ4
 367 EXP irq4
 368     cli
 369     push byte 0
 370     push byte 36
 371     jmp irq_common_stub
 372
 373 ; 37: IRQ5
 374 EXP irq5
 375     cli
 376     push byte 0
 377     push byte 37
 378     jmp irq_common_stub
 379
 380 ; 38: IRQ6
 381 EXP irq6
 382     cli
 383     push byte 0
 384     push byte 38
 385     jmp irq_common_stub
 386
 387 ; 39: IRQ7
 388 EXP irq7
 389     cli
 390     push byte 0
 391     push byte 39
 392     jmp irq_common_stub
 393
 394 ; 40: IRQ8
 395 EXP irq8
 396     cli
 397     push byte 0
 398     push byte 40
 399     jmp irq_common_stub
 400
 401 ; 41: IRQ9
 402 EXP irq9
 403     cli
 404     push byte 0
 405     push byte 41
 406     jmp irq_common_stub
 407
 408 ; 42: IRQ10
 409 EXP irq10
 410     cli
 411     push byte 0
 412     push byte 42
 413     jmp irq_common_stub
 414
 415 ; 43: IRQ11
 416 EXP irq11
 417     cli
 418     push byte 0
 419     push byte 43
 420     jmp irq_common_stub
 421
 422 ; 44: IRQ12
 423 EXP irq12
 424     cli
 425     push byte 0
 426     push byte 44
 427     jmp irq_common_stub
 428
 429 ; 45: IRQ13
 430 EXP irq13
 431     cli
 432     push byte 0
 433     push byte 45
 434     jmp irq_common_stub
 435
 436 ; 46: IRQ14
 437 EXP irq14
 438     cli
 439     push byte 0
 440     push byte 46
 441     jmp irq_common_stub
 442
 443 ; 47: IRQ15
 444 EXP irq15
 445     cli
 446     push byte 0
 447     push byte 47
 448     jmp irq_common_stub
 449
 450 IMP irq_handler
 451
 452 irq_common_stub:
 453     pusha
 454     push ds
 455     push es
 456     push fs
 457     push gs
 458
 459     mov ax, 0x10
 460     mov ds, ax
 461     mov es, ax
 462     mov fs, ax
 463     mov gs, ax
 464     mov eax, esp
 465
 466     push eax
 467     mov eax, irq_handler
 468     call eax
 469     pop eax
 470
 471     pop gs
 472     pop fs
 473     pop es
 474     pop ds
 475     popa
 476     add esp, 8
 477     iret
 478
 479 ;extern testf
 480 ;global testf_c
 481
 482 ;testf_c:
 483 ;       mov ecx, testf
 484 ;       jmp syscall0
 485
 486 ; syscall with 0 args
 487
 488 ;IMP syscall_handler
 489 ;EXP system_call
 490 ;       push ds                         ; switch to kernel space
 491 ;       push es
 492 ;       mov eax, 0x10
 493 ;       mov ds, eax
 494 ;       mov es, eax
 495
 496 ;       call syscall_handler                    ; make call
 497
 498 ;       pop es                          ; back to userland
 499 ;       pop ds
 500 ;       retf 0
 501 ;       iret
 502
 503 IMP syscall_handler
 504 EXP system_call
 505         pusha
 506         push ds
 507         push es
 508         push fs
 509         push gs
 510
 511         mov ax, 0x10
 512         mov ds, ax
 513         mov es, ax
 514         mov fs, ax
 515         mov gs, ax
 516
 517 ;       mov eax, esp
 518
 519 ;       push edx
 520 ;       push ecx
 521 ;       push ebx
 522         push esp
 523
 524         call syscall_handler                    ; make call
 525
 526         add esp, 4
 527 ;       pop eax
 528 ;       pop ebx
 529 ;       pop ecx
 530 ;       pop edx
 531
 532         pop gs
 533         pop fs
 534         pop es
 535         pop ds
 536
 537         popa
 538
 539         iret