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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 */
- /*
- * tlb_skip size stores actual number skipped TLBs from TLB0 - every directy TLB
- * mapping has to increase tlb_skip size.
- */
- extern u32 tlb_skip;
- # 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
- /* For cases when you want to skip some TLB entries */
- # define MICROBLAZE_TLB_SKIP 0
- /* Use the last TLB for temporary access to LMB */
- # define MICROBLAZE_LMB_TLB_ID 63
- /*
- * 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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