paging.h

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/* paging.h */

#ifndef __SYSTEM
 #include "routix/system.h"
#endif

#ifndef __ROUTIX_PAGING
#define __ROUTIX_PAGING

#define DIR_SIZE        4096
#define TABLA_SIZE      DIR_SIZE
#define PAGINA_SIZE     4096
#define TABLAS_POR_DIR  1024
#define PAGINAS_POR_TABLA 1024

#define POSICION_DIR_PAGINAS    ( KERNEL_FSTACK_TOP - KERNEL_STACK_SIZE - DIR_SIZE)
#define POSICION_TABLA_1        ( POSICION_DIR_PAGINAS - DIR_SIZE)
#define POSICION_TABLA_KCODE    ( POSICION_TABLA_1 - TABLA_SIZE )
#define POSICION_TABLA_KDATA    ( POSICION_TABLA_KCODE - TABLA_SIZE )
#define POSICION_TABLA_KSTACK   ( POSICION_TABLA_KDATA - TABLA_SIZE )

//Tomamos 4Kb para la GDT 
#define POSICION_TABLA_GDT      ( POSICION_TABLA_KSTACK - PAGINA_SIZE )


#define PAGE_RW         0X02
#define PAGE_PRES       0x01
#define PAGE_SUPER      1<<2
#define PAGE_USER       1<<2
/*
#define PAGE_USER       1<<2
#define PAGE_SUPER      PAGE_USER
*/

typedef dword pte_t;
typedef dword pde_t;

typedef struct pd_t {
        pde_t entry[1024];
} pd_t;

typedef struct pt_t {
        pte_t entry[1024];
} pt_t;

typedef struct page_index_t
{
        word dir_index;
        word tabla_index;
} page_index_t;


page_index_t get_page_index (addr_t );


/* Carga CR3 */
#define load_cr3(x) __asm__ ("movl %0, %%cr3" : : "r" (x) )

/* Desactiva/Activa la paginacion */
#define page_off() __asm__ ("mov %cr0, %eax; and $0x7fffffff, %eax; mov %eax, %cr0")
#define page_on()  __asm__ ("mov %cr0, %eax; or $0x80000000, %eax; mov %eax, %cr0")

void *make_pdt (void);

pde_t make_pde (addr_t direccion, word atributos);
pte_t make_pte (addr_t direccion, word atributos);

void *copy_page (void *dest, const void *src);

void *convertir_direccion ( void *dir_logica, addr_t cr3 );

int kmapmem ( addr_t fisica, addr_t logica, addr_t directorio, word atributo);
int kunmapmem (addr_t logica, addr_t directorio);

#define ALINEAR_4(dir)          (((long) dir) & 0xfffffffc)

#define GET_OFFSET(dir)         (((long) dir) & 0xfff)

#endif

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