f70172129c
if no lapic available, use 8253pit for clock now xv6 runs both on qemu (uniprocessor) and bochs (uniprocessor and MP)
35 lines
1.5 KiB
C
35 lines
1.5 KiB
C
// system defined:
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#define T_DIVIDE 0 // divide error
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#define T_DEBUG 1 // debug exception
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#define T_NMI 2 // non-maskable interrupt
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#define T_BRKPT 3 // breakpoint
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#define T_OFLOW 4 // overflow
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#define T_BOUND 5 // bounds check
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#define T_ILLOP 6 // illegal opcode
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#define T_DEVICE 7 // device not available
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#define T_DBLFLT 8 // double fault
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// #define T_COPROC 9 // reserved (not used since 486)
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#define T_TSS 10 // invalid task switch segment
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#define T_SEGNP 11 // segment not present
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#define T_STACK 12 // stack exception
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#define T_GPFLT 13 // genernal protection fault
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#define T_PGFLT 14 // page fault
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// #define T_RES 15 // reserved
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#define T_FPERR 16 // floating point error
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#define T_ALIGN 17 // aligment check
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#define T_MCHK 18 // machine check
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#define T_SIMDERR 19 // SIMD floating point error
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// These are arbitrarily chosen, but with care not to overlap
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// processor defined exceptions or interrupt vectors.
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#define T_SYSCALL 48 // system call
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#define T_DEFAULT 500 // catchall
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#define IRQ_OFFSET 32 // IRQ 0 corresponds to int IRQ_OFFSET
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#define IRQ_TIMER 0
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#define IRQ_KBD 1
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#define IRQ_IDE 14
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#define IRQ_ERROR 19
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#define IRQ_SPURIOUS 31
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