/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                               proc.h
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                                                    Forrest Yu, 2005
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

/* Used to find saved registers in the new kernel stack,
 * for there is no variable name you can use in C.
 * The macro defined below must coordinate with the equivalent in sconst.inc, 
 * whose content is used in asm.
 * Note that you shouldn't use saved registers in the old
 * kernel stack, i.e. STACK_FRAME, any more.
 * To access them, use a pointer plus a offset defined 
 * below instead.
 * added by xw, 17/12/11
 */
#pragma once
#include "protect.h"
#define INIT_STACK_SIZE 1024 * 8	//new kernel stack is 8kB
#define P_STACKBASE 0
#define GSREG 0
#define FSREG 1 * 4
#define ESREG 2 * 4
#define DSREG 3 * 4
#define EDIREG 4 * 4
#define ESIREG 5 * 4
#define EBPREG 6 * 4
#define KERNELESPREG 7 * 4
#define EBXREG 8 * 4
#define EDXREG 9 * 4
#define ECXREG 10 * 4
#define EAXREG 11 * 4
#define RETADR 12 * 4
#define EIPREG 13 * 4
#define CSREG 14 * 4
#define EFLAGSREG 15 * 4
#define ESPREG 16 * 4
#define SSREG 17 * 4
#define P_STACKTOP 18 * 4

/*总PCB表数和taskPCB表数*/	
//modified by xw, 18/8/27
//the memory space we put kernel is 0x30400~0x6ffff, so we should limit kernel size
// #define NR_PCBS	32		//add by visual 2016.4.5
// #define NR_K_PCBS 10		//add by visual 2016.4.5
#define NR_PCBS		12
//#define NR_TASKS	4	//TestA~TestC + hd_service //deleted by mingxuan 2019-5-19
#define NR_TASKS	2	//task_tty + hd_service	//modified by mingxuan 2019-5-19
#define NR_K_PCBS	4	//no K_PCB is empty now

//~xw

#define NR_CPUS		1		//numbers of cpu. added by xw, 18/6/1
#define	NR_FILES	64		//numbers of files a process can own. added by xw, 18/6/14

//enum proc_stat	{IDLE,READY,WAITING,RUNNING};		//add by visual smile 2016.4.5
//enum proc_stat	{IDLE,READY,SLEEPING};		//eliminate RUNNING state
enum proc_stat	{IDLE,READY,SLEEPING,KILLED};	/* add KILLED state. when a process's state is KILLED, the process
												 * won't be scheduled anymore, but all of the resources owned by
												 * it is not freed yet.
												 * added by xw, 18/12/19
												 */

#define NR_CHILD_MAX (NR_PCBS-NR_K_PCBS-1)    //定义最多子进程/线程数量	//add by visual 2016.5.26
#define TYPE_PROCESS	0//进程//add by visual 2016.5.26
#define TYPE_THREAD		1//线程//add by visual 2016.5.26

typedef struct s_stackframe {	/* proc_ptr points here				↑ Low			*/
	u32	gs;			/* ┓						│			*/
	u32	fs;			/* ┃						│			*/
	u32	es;			/* ┃						│			*/
	u32	ds;			/* ┃						│			*/
	u32	edi;		/* ┃						│			*/
	u32	esi;		/* ┣ pushed by save()				│			*/
	u32	ebp;		/* ┃						│			*/
	u32	kernel_esp;	/* <- 'popad' will ignore it			│			*/
	u32	ebx;		/* ┃						↑栈从高地址往低地址增长*/		
	u32	edx;		/* ┃						│			*/
	u32	ecx;		/* ┃						│			*/
	u32	eax;		/* ┛						│			*/
	u32	retaddr;	/* return address for assembly code save()	│			*/
	u32	eip;		/*  ┓						│			*/
	u32	cs;			/*  ┃						│			*/
	u32	eflags;		/*  ┣ these are pushed by CPU during interrupt	│			*/
	u32	esp;		/*  ┃						│			*/
	u32	ss;			/*  ┛						┷High			*/
}STACK_FRAME;

typedef struct s_tree_info{//进程树记录，包括父进程，子进程，子线程  //add by visual 2016.5.25
	int type;			//当前是进程还是线程
	int real_ppid;  	//亲父进程，创建它的那个进程
	int ppid;			//当前父进程	
	int child_p_num;	//子进程数量
	int child_process[NR_CHILD_MAX];//子进程列表
	int child_t_num;		//子线程数量
	int child_thread[NR_CHILD_MAX];//子线程列表	
	int text_hold;			//是否拥有代码
	int data_hold;			//是否拥有数据
}TREE_INFO;

typedef struct s_lin_memmap {//线性地址分布结构体	edit by visual 2016.5.25
	u32 text_lin_base;						//代码段基址
	u32 text_lin_limit;						//代码段界限

	u32 data_lin_base;						//数据段基址
	u32 data_lin_limit;						//数据段界限
	
	u32 vpage_lin_base;						//保留内存基址
	u32 vpage_lin_limit;					//保留内存界限
	
	u32 heap_lin_base;						//堆基址
	u32 heap_lin_limit;						//堆界限	
	
	u32 stack_lin_base;						//栈基址
	u32 stack_lin_limit;					//栈界限（使用时注意栈的生长方向）
	
	u32 arg_lin_base;						//参数内存基址
	u32 arg_lin_limit;						//参数内存界限
	
	u32 kernel_lin_base;					//内核基址
	u32 kernel_lin_limit;					//内核界限
	
	u32 stack_child_limit;					//分给子线程的栈的界限		//add by visual 2016.5.27
}LIN_MEMMAP;

typedef struct s_proc {
	STACK_FRAME regs;          /* process registers saved in stack frame */

	u16 ldt_sel;               /* gdt selector giving ldt base and limit */
	DESCRIPTOR ldts[LDT_SIZE]; /* local descriptors for code and data */
	
	char* esp_save_int;		//to save the position of esp in the kernel stack of the process
							//added by xw, 17/12/11
	char* esp_save_syscall;	//to save the position of esp in the kernel stack of the process
	char* esp_save_context;	//to save the position of esp in the kernel stack of the process
//	int   save_type;		//the cause of process losting CPU	//save_type is not needed any more, xw, 18/4/20
							//1st-bit for interruption, 2nd-bit for context, 3rd-bit for syscall
	void* channel;			/*if non-zero, sleeping on channel, which is a pointer of the target field
							for example, as for syscall sleep(int n), the target field is 'ticks',
							and the channel is a pointer of 'ticks'.
							*/

	LIN_MEMMAP	memmap;			//线性内存分部信息 		add by visual 2016.5.4
	TREE_INFO info;				//记录进程树关系	add by visual 2016.5.25
    int ticks;                 /* remained ticks */
    int priority;

	u32 pid;                   /* process id passed in from MM */
	char p_name[16];           /* name of the process */
	
	enum proc_stat stat;			//add by visual 2016.4.5
	
	u32 cr3;						//add by visual 2016.4.5
	
	//added by zcr
	struct file_desc * filp[NR_FILES];
	//~zcr
}PROCESS_0;

//new PROCESS struct with PCB and process's kernel stack
//added by xw, 17/12/11
typedef union task_union {
	PROCESS_0 task;
	char stack[INIT_STACK_SIZE/sizeof(char)];
}PROCESS;

typedef struct s_task {
	task_f	initial_eip;
	int	stacksize;
	char	name[32];
}TASK;

#define STACK_SIZE_TASK		0x1000	//add by visual 2016.4.5
//#define STACK_SIZE_TOTAL	(STACK_SIZE_TASK*NR_PCBS)	//edit by visual 2016.4.5

//added by zcr
#define proc2pid(x) (x - proc_table)