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-rw-r--r--arch/i386/kernel/head.S67
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/i386/kernel/head.S b/arch/i386/kernel/head.S
index a6b8bd89aa27..be9d883c62ce 100644
--- a/arch/i386/kernel/head.S
+++ b/arch/i386/kernel/head.S
@@ -371,8 +371,65 @@ rp_sidt:
371 addl $8,%edi 371 addl $8,%edi
372 dec %ecx 372 dec %ecx
373 jne rp_sidt 373 jne rp_sidt
374
375.macro set_early_handler handler,trapno
376 lea \handler,%edx
377 movl $(__KERNEL_CS << 16),%eax
378 movw %dx,%ax
379 movw $0x8E00,%dx /* interrupt gate - dpl=0, present */
380 lea idt_table,%edi
381 movl %eax,8*\trapno(%edi)
382 movl %edx,8*\trapno+4(%edi)
383.endm
384
385 set_early_handler handler=early_divide_err,trapno=0
386 set_early_handler handler=early_illegal_opcode,trapno=6
387 set_early_handler handler=early_protection_fault,trapno=13
388 set_early_handler handler=early_page_fault,trapno=14
389
374 ret 390 ret
375 391
392early_divide_err:
393 xor %edx,%edx
394 pushl $0 /* fake errcode */
395 jmp early_fault
396
397early_illegal_opcode:
398 movl $6,%edx
399 pushl $0 /* fake errcode */
400 jmp early_fault
401
402early_protection_fault:
403 movl $13,%edx
404 jmp early_fault
405
406early_page_fault:
407 movl $14,%edx
408 jmp early_fault
409
410early_fault:
411 cld
412#ifdef CONFIG_PRINTK
413 movl $(__KERNEL_DS),%eax
414 movl %eax,%ds
415 movl %eax,%es
416 cmpl $2,early_recursion_flag
417 je hlt_loop
418 incl early_recursion_flag
419 movl %cr2,%eax
420 pushl %eax
421 pushl %edx /* trapno */
422 pushl $fault_msg
423#ifdef CONFIG_EARLY_PRINTK
424 call early_printk
425#else
426 call printk
427#endif
428#endif
429hlt_loop:
430 hlt
431 jmp hlt_loop
432
376/* This is the default interrupt "handler" :-) */ 433/* This is the default interrupt "handler" :-) */
377 ALIGN 434 ALIGN
378ignore_int: 435ignore_int:
@@ -386,6 +443,9 @@ ignore_int:
386 movl $(__KERNEL_DS),%eax 443 movl $(__KERNEL_DS),%eax
387 movl %eax,%ds 444 movl %eax,%ds
388 movl %eax,%es 445 movl %eax,%es
446 cmpl $2,early_recursion_flag
447 je hlt_loop
448 incl early_recursion_flag
389 pushl 16(%esp) 449 pushl 16(%esp)
390 pushl 24(%esp) 450 pushl 24(%esp)
391 pushl 32(%esp) 451 pushl 32(%esp)
@@ -431,9 +491,16 @@ ENTRY(stack_start)
431 491
432ready: .byte 0 492ready: .byte 0
433 493
494early_recursion_flag:
495 .long 0
496
434int_msg: 497int_msg:
435 .asciz "Unknown interrupt or fault at EIP %p %p %p\n" 498 .asciz "Unknown interrupt or fault at EIP %p %p %p\n"
436 499
500fault_msg:
501 .ascii "Int %d: CR2 %p err %p EIP %p CS %p flags %p\n"
502 .asciz "Stack: %p %p %p %p %p %p %p %p\n"
503
437/* 504/*
438 * The IDT and GDT 'descriptors' are a strange 48-bit object 505 * The IDT and GDT 'descriptors' are a strange 48-bit object
439 * only used by the lidt and lgdt instructions. They are not 506 * only used by the lidt and lgdt instructions. They are not