1 #ifndef USERPROG_EXCEPTION_H
2 #define USERPROG_EXCEPTION_H
4 /* Page fault error code bits that describe the cause of the exception. */
5 #define PF_P 0x1 /* 0: not-present page. 1: access rights violation. */
6 #define PF_W 0x2 /* 0: read, 1: write. */
7 #define PF_U 0x4 /* 0: kernel, 1: user process. */
9 void exception_init (void);
10 void exception_print_stats (void);
12 #endif /* userprog/exception.h */