add lab answers

labcodes_answer/lab4_result/kern/process/proc.h

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+#ifndef __KERN_PROCESS_PROC_H__
+#define __KERN_PROCESS_PROC_H__
+
+#include <defs.h>
+#include <list.h>
+#include <trap.h>
+#include <memlayout.h>
+
+
+// process's state in his life cycle
+enum proc_state {
+    PROC_UNINIT = 0,  // uninitialized
+    PROC_SLEEPING,    // sleeping
+    PROC_RUNNABLE,    // runnable(maybe running)
+    PROC_ZOMBIE,      // almost dead, and wait parent proc to reclaim his resource
+};
+
+// Saved registers for kernel context switches.
+// Don't need to save all the %fs etc. segment registers,
+// because they are constant across kernel contexts.
+// Save all the regular registers so we don't need to care
+// which are caller save, but not the return register %eax.
+// (Not saving %eax just simplifies the switching code.)
+// The layout of context must match code in switch.S.
+struct context {
+    uint32_t eip;
+    uint32_t esp;
+    uint32_t ebx;
+    uint32_t ecx;
+    uint32_t edx;
+    uint32_t esi;
+    uint32_t edi;
+    uint32_t ebp;
+};
+
+#define PROC_NAME_LEN               15
+#define MAX_PROCESS                 4096
+#define MAX_PID                     (MAX_PROCESS * 2)
+
+extern list_entry_t proc_list;
+
+struct proc_struct {
+    enum proc_state state;                      // Process state
+    int pid;                                    // Process ID
+    int runs;                                   // the running times of Proces
+    uintptr_t kstack;                           // Process kernel stack
+    volatile bool need_resched;                 // bool value: need to be rescheduled to release CPU?
+    struct proc_struct *parent;                 // the parent process
+    struct mm_struct *mm;                       // Process's memory management field
+    struct context context;                     // Switch here to run process
+    struct trapframe *tf;                       // Trap frame for current interrupt
+    uintptr_t cr3;                              // CR3 register: the base addr of Page Directroy Table(PDT)
+    uint32_t flags;                             // Process flag
+    char name[PROC_NAME_LEN + 1];               // Process name
+    list_entry_t list_link;                     // Process link list 
+    list_entry_t hash_link;                     // Process hash list
+};
+
+#define le2proc(le, member)         \
+    to_struct((le), struct proc_struct, member)
+
+extern struct proc_struct *idleproc, *initproc, *current;
+
+void proc_init(void);
+void proc_run(struct proc_struct *proc);
+int kernel_thread(int (*fn)(void *), void *arg, uint32_t clone_flags);
+
+char *set_proc_name(struct proc_struct *proc, const char *name);
+char *get_proc_name(struct proc_struct *proc);
+void cpu_idle(void) __attribute__((noreturn));
+
+struct proc_struct *find_proc(int pid);
+int do_fork(uint32_t clone_flags, uintptr_t stack, struct trapframe *tf);
+int do_exit(int error_code);
+
+#endif /* !__KERN_PROCESS_PROC_H__ */
+