《操作系统》的实验代码。
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#ifndef __KERN_TRAP_TRAP_H__
#define __KERN_TRAP_TRAP_H__
#include <defs.h>
/* Trap Numbers */
/* Processor-defined: */
#define T_DIVIDE 0 // divide error
#define T_DEBUG 1 // debug exception
#define T_NMI 2 // non-maskable interrupt
#define T_BRKPT 3 // breakpoint
#define T_OFLOW 4 // overflow
#define T_BOUND 5 // bounds check
#define T_ILLOP 6 // illegal opcode
#define T_DEVICE 7 // device not available
#define T_DBLFLT 8 // double fault
// #define T_COPROC 9 // reserved (not used since 486)
#define T_TSS 10 // invalid task switch segment
#define T_SEGNP 11 // segment not present
#define T_STACK 12 // stack exception
#define T_GPFLT 13 // general protection fault
#define T_PGFLT 14 // page fault
// #define T_RES 15 // reserved
#define T_FPERR 16 // floating point error
#define T_ALIGN 17 // aligment check
#define T_MCHK 18 // machine check
#define T_SIMDERR 19 // SIMD floating point error
#define T_SYSCALL 0x80 // SYSCALL, ONLY FOR THIS PROJ
/* Hardware IRQ numbers. We receive these as (IRQ_OFFSET + IRQ_xx) */
#define IRQ_OFFSET 32 // IRQ 0 corresponds to int IRQ_OFFSET
#define IRQ_TIMER 0
#define IRQ_KBD 1
#define IRQ_COM1 4
#define IRQ_IDE1 14
#define IRQ_IDE2 15
#define IRQ_ERROR 19
#define IRQ_SPURIOUS 31
/* *
* These are arbitrarily chosen, but with care not to overlap
* processor defined exceptions or interrupt vectors.
* */
#define T_SWITCH_TOU 120 // user/kernel switch
#define T_SWITCH_TOK 121 // user/kernel switch
/* registers as pushed by pushal */
struct pushregs {
uint32_t reg_edi;
uint32_t reg_esi;
uint32_t reg_ebp;
uint32_t reg_oesp; /* Useless */
uint32_t reg_ebx;
uint32_t reg_edx;
uint32_t reg_ecx;
uint32_t reg_eax;
};
struct trapframe {
struct pushregs tf_regs;
uint16_t tf_gs;
uint16_t tf_padding0;
uint16_t tf_fs;
uint16_t tf_padding1;
uint16_t tf_es;
uint16_t tf_padding2;
uint16_t tf_ds;
uint16_t tf_padding3;
uint32_t tf_trapno;
/* below here defined by x86 hardware */
uint32_t tf_err;
uintptr_t tf_eip;
uint16_t tf_cs;
uint16_t tf_padding4;
uint32_t tf_eflags;
/* below here only when crossing rings, such as from user to kernel */
uintptr_t tf_esp;
uint16_t tf_ss;
uint16_t tf_padding5;
} __attribute__((packed));
void idt_init(void);
void print_trapframe(struct trapframe *tf);
void print_regs(struct pushregs *regs);
bool trap_in_kernel(struct trapframe *tf);
#endif /* !__KERN_TRAP_TRAP_H__ */