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/*
* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2008-2009 PetaLogix
* Copyright (C) 2006 Atmark Techno, Inc.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#ifndef _ASM_MICROBLAZE_MMU_H
#define _ASM_MICROBLAZE_MMU_H
# ifndef CONFIG_MMU
# include <asm-generic/mmu.h>
# else /* CONFIG_MMU */
# ifdef __KERNEL__
# ifndef __ASSEMBLY__
/* Default "unsigned long" context */
typedef unsigned long mm_context_t;
/* Hardware Page Table Entry */
typedef struct _PTE {
unsigned long v:1; /* Entry is valid */
unsigned long vsid:24; /* Virtual segment identifier */
unsigned long h:1; /* Hash algorithm indicator */
unsigned long api:6; /* Abbreviated page index */
unsigned long rpn:20; /* Real (physical) page number */
unsigned long :3; /* Unused */
unsigned long r:1; /* Referenced */
unsigned long c:1; /* Changed */
unsigned long w:1; /* Write-thru cache mode */
unsigned long i:1; /* Cache inhibited */
unsigned long m:1; /* Memory coherence */
unsigned long g:1; /* Guarded */
unsigned long :1; /* Unused */
unsigned long pp:2; /* Page protection */
} PTE;
/* Values for PP (assumes Ks=0, Kp=1) */
# define PP_RWXX 0 /* Supervisor read/write, User none */
# define PP_RWRX 1 /* Supervisor read/write, User read */
# define PP_RWRW 2 /* Supervisor read/write, User read/write */
# define PP_RXRX 3 /* Supervisor read, User read */
/* Segment Register */
typedef struct _SEGREG {
unsigned long t:1; /* Normal or I/O type */
unsigned long ks:1; /* Supervisor 'key' (normally 0) */
unsigned long kp:1; /* User 'key' (normally 1) */
unsigned long n:1; /* No-execute */
unsigned long :4; /* Unused */
unsigned long vsid:24; /* Virtual Segment Identifier */
} SEGREG;
extern void _tlbie(unsigned long va); /* invalidate a TLB entry */
extern void _tlbia(void); /* invalidate all TLB entries */
# endif /* __ASSEMBLY__ */
/*
* The MicroBlaze processor has a TLB architecture identical to PPC-40x. The
* instruction and data sides share a unified, 64-entry, semi-associative
* TLB which is maintained totally under software control. In addition, the
* instruction side has a hardware-managed, 2,4, or 8-entry, fully-associative
* TLB which serves as a first level to the shared TLB. These two TLBs are
* known as the UTLB and ITLB, respectively.
*/
# define MICROBLAZE_TLB_SIZE 64
# define MICROBLAZE_TLB_SKIP 2
/*
* TLB entries are defined by a "high" tag portion and a "low" data
* portion. The data portion is 32-bits.
*
* TLB entries are managed entirely under software control by reading,
* writing, and searching using the MTS and MFS 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 */
# endif /* __KERNEL__ */
# endif /* CONFIG_MMU */
#endif /* _ASM_MICROBLAZE_MMU_H */
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