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mm.h
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mm.h
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#ifndef _MM_H
#define _MM_H
#define PAGE_SIZE 4096
#include <linux/kernel.h>
#include <signal.h>
extern int SWAP_DEV;
#define read_swap_page(nr,buffer) ll_rw_page(READ,SWAP_DEV,(nr),(buffer));
#define write_swap_page(nr,buffer) ll_rw_page(WRITE,SWAP_DEV,(nr),(buffer));
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);
void swap_free(int page_nr);
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