kernel.h

一个用于学习的操作系统

/*文件名: kernel.h
  说明:
  作者:   marsinfan
  日期:   2005/12/07
*/

#ifndef _LINUX_KERNEL_H
#define _LINUX_KERNEL_H
#include <fairysky/types.h>

#define PARAMS 0x0500

typedef struct params_info {
    u8 cusor_x;         //光标位置
    u8 cusor_y;         //光标位置
    u8 mem_size;        //物理内存大小，已转化为M
    u8 nouse1;
    u8 display_page;    //当前显示页面
    u8 nouse2;
    u8 video_mode;      //显示模式
    u8 window_width;    //字符列数
    s16 nouse3;
    u8 vidio_mem_size;  //显示内存
    u8 display_stat;    //显示状态
    s16 vidio_param;    //显卡特性参数
    u8 BIOS[32];        //硬盘参数表
    s16 DEV_ROOT;       //根文件系统设备号
}__attribute__((packed)) PARAMS_INFO;

extern PARAMS_INFO *pparams;
/*
 * 'kernel.h' contains some often-used function prototypes etc
 */

#define PAGE_OFFSET  0xC0000000   //进行分页后，内核所在的虚拟地址

//虚拟地址转化为物理地址
#define vaddr_to_paddr(vaddr) \
    ((addr_t)(vaddr) - PAGE_OFFSET)

//物理地址转化为虚拟地址
#define paddr_to_vaddr(paddr) \
    ((addr_t)((paddr) + PAGE_OFFSET))

//物理地址转化为页面索引
#define paddr_to_index(paddr) \
    ((paddr) >> 12)

//页面索引转化为物理地址
#define index_to_paddr(index) \
    ((index) << 12)

//页面索引转化为虚拟地址
#define index_to_vaddr(index)  \
    (paddr_to_vaddr(index_to_paddr(index)))

//虚拟地址转化为页面索引
#define vaddr_to_index(vaddr)  \
    (paddr_to_index(vaddr_to_paddr(vaddr)))

void verify_area(void * addr, size_t size);

//volatile void do_exit(long error_code);
int printk(const char *fmt, ...);
void print_hex(void *buf, size_t count);
extern int panic(const char *s);
extern int sprintf(char *str, const char *fmt, ...);

//void * malloc(unsigned int size);
//void free_s(void * obj, int size);
//#define free(x) free_s((x), 0)

/*
 * This is defined as a macro, but at some point this might become a
 * real subroutine that sets a flag if it returns true (to do
 * BSD-style accounting where the process is flagged if it uses root
 * privs).  The implication of this is that you should do normal
 * permissions checks first, and check suser() last.
 */
//#define suser() (current->euid == 0)

#endif