#ifndef _ASM_POWERPC_MMU_40X_H_
#define _ASM_POWERPC_MMU_40X_H_

/*
* PPC40x support
*/

#define PPC40X_TLB_SIZE 64

/*
* TLB entries are defined by a "high" tag portion and a "low" data
* portion. On all architectures, the data portion is 32-bits.
*
* TLB entries are managed entirely under software control by reading,
* writing, and searchoing using the 4xx-specific tlbre, tlbwr, and tlbsx
* instructions.
*/

#define TLB_LO 1
#define TLB_HI 0

#define TLB_DATA TLB_LO
#define TLB_TAG TLB_HI

/* Tag portion */

#define TLB_EPN_MASK 0xFFFFFC00 /* Effective Page Number */
#define TLB_PAGESZ_MASK 0x00000380
#define TLB_PAGESZ(x) (((x) & 0x7) << 7)
#define PAGESZ_1K 0
#define PAGESZ_4K 1
#define PAGESZ_16K 2
#define PAGESZ_64K 3
#define PAGESZ_256K 4
#define PAGESZ_1M 5
#define PAGESZ_4M 6
#define PAGESZ_16M 7
#define TLB_VALID 0x00000040 /* Entry is valid */

/* Data portion */

#define TLB_RPN_MASK 0xFFFFFC00 /* Real Page Number */
#define TLB_PERM_MASK 0x00000300
#define TLB_EX 0x00000200 /* Instruction execution allowed */
#define TLB_WR 0x00000100 /* Writes permitted */
#define TLB_ZSEL_MASK 0x000000F0
#define TLB_ZSEL(x) (((x) & 0xF) << 4)
#define TLB_ATTR_MASK 0x0000000F
#define TLB_W 0x00000008 /* Caching is write-through */
#define TLB_I 0x00000004 /* Caching is inhibited */
#define TLB_M 0x00000002 /* Memory is coherent */
#define TLB_G 0x00000001 /* Memory is guarded from prefetch */

#ifndef __ASSEMBLY__

typedef struct {
unsigned int id;
unsigned int active;
unsigned long vdso_base;
} mm_context_t;

#endif /* !__ASSEMBLY__ */

#define mmu_virtual_psize MMU_PAGE_4K
#define mmu_linear_psize MMU_PAGE_256M

#endif /* _ASM_POWERPC_MMU_40X_H_ */