i386/ucla/src/lab3/inc/trap.h

   1 #ifndef JOS_INC_TRAP_H
   2 #define JOS_INC_TRAP_H
   3
   4 // Trap numbers
   5 // These are processor defined:
   6 #define T_DIVIDE     0          // divide error
   7 #define T_DEBUG      1          // debug exception
   8 #define T_NMI        2          // non-maskable interrupt
   9 #define T_BRKPT      3          // breakpoint
  10 #define T_OFLOW      4          // overflow
  11 #define T_BOUND      5          // bounds check
  12 #define T_ILLOP      6          // illegal opcode
  13 #define T_DEVICE     7          // device not available
  14 #define T_DBLFLT     8          // double fault
  15 /* #define T_COPROC  9 */       // reserved (not generated by recent processors)
  16 #define T_TSS       10          // invalid task switch segment
  17 #define T_SEGNP     11          // segment not present
  18 #define T_STACK     12          // stack exception
  19 #define T_GPFLT     13          // general protection fault
  20 #define T_PGFLT     14          // page fault
  21 /* #define T_RES    15 */       // reserved
  22 #define T_FPERR     16          // floating point error
  23 #define T_ALIGN     17          // aligment check
  24 #define T_MCHK      18          // machine check
  25 #define T_SIMDERR   19          // SIMD floating point error
  26
  27 // These are arbitrarily chosen, but with care not to overlap
  28 // processor defined exceptions or interrupt vectors.
  29 #define T_SYSCALL   48          // system call
  30 #define T_DEFAULT   500         // catchall
  31
  32 // Hardware IRQ numbers. We receive these as (IRQ_OFFSET+IRQ_WHATEVER)
  33 #define IRQ_TIMER        0
  34 #define IRQ_KBD          1
  35 #define IRQ_SERIAL       4
  36 #define IRQ_SPURIOUS     7
  37 #define IRQ_IDE         14
  38 #define IRQ_ERROR       19
  39
  40 #ifndef __ASSEMBLER__
  41
  42 #include <inc/types.h>
  43
  44 struct PushRegs {
  45         /* registers as pushed by pusha */
  46         uint32_t reg_edi;
  47         uint32_t reg_esi;
  48         uint32_t reg_ebp;
  49         uint32_t reg_oesp;              /* Useless */
  50         uint32_t reg_ebx;
  51         uint32_t reg_edx;
  52         uint32_t reg_ecx;
  53         uint32_t reg_eax;
  54 } __attribute__((packed));
  55
  56 struct Trapframe {
  57         struct PushRegs tf_regs;
  58         uint16_t tf_es;
  59         uint16_t tf_padding1;
  60         uint16_t tf_ds;
  61         uint16_t tf_padding2;
  62         uint32_t tf_trapno;
  63         /* below here defined by x86 hardware */
  64         uint32_t tf_err;
  65         uintptr_t tf_eip;
  66         uint16_t tf_cs;
  67         uint16_t tf_padding3;
  68         uint32_t tf_eflags;
  69         /* below here only when crossing rings, such as from user to kernel */
  70         uintptr_t tf_esp;
  71         uint16_t tf_ss;
  72         uint16_t tf_padding4;
  73 } __attribute__((packed));
  74
  75 struct UTrapframe {
  76         /* information about the fault */
  77         uint32_t utf_fault_va;  /* va for T_PGFLT, 0 otherwise */
  78         uint32_t utf_err;
  79         /* trap-time return state */
  80         struct PushRegs utf_regs;
  81         uintptr_t utf_eip;
  82         uint32_t utf_eflags;
  83         /* the trap-time stack to return to */
  84         uintptr_t utf_esp;
  85 } __attribute__((packed));
  86
  87 #endif /* !__ASSEMBLER__ */
  88
  89 // Must equal 'sizeof(struct Trapframe)'.
  90 // A static_assert in kern/trap.c checks this.
  91 #define SIZEOF_STRUCT_TRAPFRAME 0x44
  92
  93 #endif /* !JOS_INC_TRAP_H */