#ifndef _MM_H #define _MM_H #define PAGE_SIZE 4096 #include <linux/fs.h> #include <linux/kernel.h> #include <signal.h> extern unsigned int swap_device; extern struct inode * swap_file; extern void rw_swap_page(int rw, unsigned int nr, char * buf); #define read_swap_page(nr,buf) \ rw_swap_page(READ,(nr),(buf)) #define write_swap_page(nr,buf) \ rw_swap_page(WRITE,(nr),(buf)) /* memory.c */ extern unsigned long get_free_page(void); extern unsigned long put_dirty_page(unsigned long page,unsigned long address); extern void free_page(unsigned long addr); extern int free_page_tables(unsigned long from,unsigned long size); extern int copy_page_tables(unsigned long from,unsigned long to,long size); extern int unmap_page_range(unsigned long from, unsigned long size); extern int remap_page_range(unsigned long from, unsigned long to, unsigned long size, int permiss); extern void un_wp_page(unsigned long * table_entry); extern void do_wp_page(unsigned long error_code,unsigned long address); extern void write_verify(unsigned long address); extern void do_no_page(unsigned long error_code, unsigned long address, struct task_struct *tsk, unsigned long user_esp); extern void mem_init(long start_mem, long end_mem); extern void show_mem(void); extern void do_page_fault(unsigned long *esp, unsigned long error_code); /* swap.c */ extern void swap_free(int page_nr); extern void swap_in(unsigned long *table_ptr); extern inline volatile void oom(void) { printk("out of memory\n\r"); do_exit(SIGSEGV); } #define invalidate() \ __asm__("movl %%eax,%%cr3"::"a" (0)) /* these are not to be changed without changing head.s etc */ #define LOW_MEM 0x100000 extern unsigned long HIGH_MEMORY; #define PAGING_MEMORY (15*1024*1024) #define PAGING_PAGES (PAGING_MEMORY>>12) #define MAP_NR(addr) (((addr)-LOW_MEM)>>12) #define USED 100 extern unsigned char mem_map [ PAGING_PAGES ]; #define PAGE_DIRTY 0x40 #define PAGE_ACCESSED 0x20 #define PAGE_USER 0x04 #define PAGE_RW 0x02 #define PAGE_PRESENT 0x01 #endif