6fb7bdd343
This is pretty much a complete rewrite based on the existing i386 code. The patches have been circulating for a couple years and have been looked at by plenty of people, but I'm not putting anybody on the hook as having reviewed this in any formal sense except myself. After this has gotten wider testing from the user community, ARM_NEW_PMAP will become the default and various dregs of the old pmap code will be removed. Submitted by: Svatopluk Kraus <onwahe@gmail.com>, Michal Meloun <meloun@miracle.cz>
361 lines
12 KiB
C
361 lines
12 KiB
C
/* $NetBSD: pte.h,v 1.1 2001/11/23 17:39:04 thorpej Exp $ */
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/*-
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* Copyright (c) 1994 Mark Brinicombe.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the RiscBSD team.
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* 4. The name "RiscBSD" nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY RISCBSD ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL RISCBSD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifdef ARM_NEW_PMAP
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#include <machine/pte-v6.h>
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#else /* ARM_NEW_PMAP */
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#ifndef _MACHINE_PTE_H_
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#define _MACHINE_PTE_H_
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#ifndef LOCORE
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typedef uint32_t pd_entry_t; /* page directory entry */
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typedef uint32_t pt_entry_t; /* page table entry */
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#endif
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#define PG_FRAME 0xfffff000
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/* The PT_SIZE definition is misleading... A page table is only 0x400
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* bytes long. But since VM mapping can only be done to 0x1000 a single
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* 1KB blocks cannot be steered to a va by itself. Therefore the
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* pages tables are allocated in blocks of 4. i.e. if a 1 KB block
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* was allocated for a PT then the other 3KB would also get mapped
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* whenever the 1KB was mapped.
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*/
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#define PT_RSIZE 0x0400 /* Real page table size */
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#define PT_SIZE 0x1000
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#define PD_SIZE 0x4000
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/* Page table types and masks */
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#define L1_PAGE 0x01 /* L1 page table mapping */
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#define L1_SECTION 0x02 /* L1 section mapping */
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#define L1_FPAGE 0x03 /* L1 fine page mapping */
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#define L1_MASK 0x03 /* Mask for L1 entry type */
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#define L2_LPAGE 0x01 /* L2 large page (64KB) */
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#define L2_SPAGE 0x02 /* L2 small page (4KB) */
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#define L2_MASK 0x03 /* Mask for L2 entry type */
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#define L2_INVAL 0x00 /* L2 invalid type */
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/* L1 and L2 address masks */
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#define L1_ADDR_MASK 0xfffffc00
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#define L2_ADDR_MASK 0xfffff000
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/*
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* The ARM MMU architecture was introduced with ARM v3 (previous ARM
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* architecture versions used an optional off-CPU memory controller
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* to perform address translation).
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*
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* The ARM MMU consists of a TLB and translation table walking logic.
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* There is typically one TLB per memory interface (or, put another
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* way, one TLB per software-visible cache).
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*
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* The ARM MMU is capable of mapping memory in the following chunks:
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*
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* 1M Sections (L1 table)
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*
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* 64K Large Pages (L2 table)
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*
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* 4K Small Pages (L2 table)
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*
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* 1K Tiny Pages (L2 table)
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*
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* There are two types of L2 tables: Coarse Tables and Fine Tables.
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* Coarse Tables can map Large and Small Pages. Fine Tables can
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* map Tiny Pages.
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*
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* Coarse Tables can define 4 Subpages within Large and Small pages.
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* Subpages define different permissions for each Subpage within
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* a Page.
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*
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* Coarse Tables are 1K in length. Fine tables are 4K in length.
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*
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* The Translation Table Base register holds the pointer to the
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* L1 Table. The L1 Table is a 16K contiguous chunk of memory
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* aligned to a 16K boundary. Each entry in the L1 Table maps
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* 1M of virtual address space, either via a Section mapping or
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* via an L2 Table.
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*
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* In addition, the Fast Context Switching Extension (FCSE) is available
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* on some ARM v4 and ARM v5 processors. FCSE is a way of eliminating
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* TLB/cache flushes on context switch by use of a smaller address space
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* and a "process ID" that modifies the virtual address before being
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* presented to the translation logic.
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*/
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/* ARMv6 super-sections. */
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#define L1_SUP_SIZE 0x01000000 /* 16M */
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#define L1_SUP_OFFSET (L1_SUP_SIZE - 1)
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#define L1_SUP_FRAME (~L1_SUP_OFFSET)
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#define L1_SUP_SHIFT 24
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#define L1_S_SIZE 0x00100000 /* 1M */
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#define L1_S_OFFSET (L1_S_SIZE - 1)
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#define L1_S_FRAME (~L1_S_OFFSET)
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#define L1_S_SHIFT 20
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#define L2_L_SIZE 0x00010000 /* 64K */
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#define L2_L_OFFSET (L2_L_SIZE - 1)
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#define L2_L_FRAME (~L2_L_OFFSET)
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#define L2_L_SHIFT 16
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#define L2_S_SIZE 0x00001000 /* 4K */
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#define L2_S_OFFSET (L2_S_SIZE - 1)
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#define L2_S_FRAME (~L2_S_OFFSET)
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#define L2_S_SHIFT 12
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#define L2_T_SIZE 0x00000400 /* 1K */
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#define L2_T_OFFSET (L2_T_SIZE - 1)
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#define L2_T_FRAME (~L2_T_OFFSET)
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#define L2_T_SHIFT 10
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/*
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* The NetBSD VM implementation only works on whole pages (4K),
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* whereas the ARM MMU's Coarse tables are sized in terms of 1K
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* (16K L1 table, 1K L2 table).
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*
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* So, we allocate L2 tables 4 at a time, thus yielding a 4K L2
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* table.
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*/
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#define L1_ADDR_BITS 0xfff00000 /* L1 PTE address bits */
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#define L2_ADDR_BITS 0x000ff000 /* L2 PTE address bits */
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#define L1_TABLE_SIZE 0x4000 /* 16K */
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#define L2_TABLE_SIZE 0x1000 /* 4K */
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/*
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* The new pmap deals with the 1KB coarse L2 tables by
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* allocating them from a pool. Until every port has been converted,
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* keep the old L2_TABLE_SIZE define lying around. Converted ports
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* should use L2_TABLE_SIZE_REAL until then.
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*/
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#define L2_TABLE_SIZE_REAL 0x400 /* 1K */
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/* Total number of page table entries in L2 table */
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#define L2_PTE_NUM_TOTAL (L2_TABLE_SIZE_REAL / sizeof(pt_entry_t))
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/*
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* ARM L1 Descriptors
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*/
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#define L1_TYPE_INV 0x00 /* Invalid (fault) */
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#define L1_TYPE_C 0x01 /* Coarse L2 */
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#define L1_TYPE_S 0x02 /* Section */
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#define L1_TYPE_F 0x03 /* Fine L2 */
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#define L1_TYPE_MASK 0x03 /* mask of type bits */
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/* L1 Section Descriptor */
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#define L1_S_B 0x00000004 /* bufferable Section */
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#define L1_S_C 0x00000008 /* cacheable Section */
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#define L1_S_IMP 0x00000010 /* implementation defined */
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#define L1_S_XN (1 << 4) /* execute not */
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#define L1_S_DOM(x) ((x) << 5) /* domain */
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#define L1_S_DOM_MASK L1_S_DOM(0xf)
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#define L1_S_AP(x) ((x) << 10) /* access permissions */
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#define L1_S_ADDR_MASK 0xfff00000 /* phys address of section */
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#define L1_S_TEX(x) (((x) & 0x7) << 12) /* Type Extension */
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#define L1_S_TEX_MASK (0x7 << 12) /* Type Extension */
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#define L1_S_APX (1 << 15)
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#define L1_SHARED (1 << 16)
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#define L1_S_XSCALE_P 0x00000200 /* ECC enable for this section */
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#define L1_S_XSCALE_TEX(x) ((x) << 12) /* Type Extension */
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#define L1_S_SUPERSEC ((1) << 18) /* Section is a super-section. */
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/* L1 Coarse Descriptor */
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#define L1_C_IMP0 0x00000004 /* implementation defined */
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#define L1_C_IMP1 0x00000008 /* implementation defined */
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#define L1_C_IMP2 0x00000010 /* implementation defined */
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#define L1_C_DOM(x) ((x) << 5) /* domain */
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#define L1_C_DOM_MASK L1_C_DOM(0xf)
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#define L1_C_ADDR_MASK 0xfffffc00 /* phys address of L2 Table */
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#define L1_C_XSCALE_P 0x00000200 /* ECC enable for this section */
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/* L1 Fine Descriptor */
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#define L1_F_IMP0 0x00000004 /* implementation defined */
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#define L1_F_IMP1 0x00000008 /* implementation defined */
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#define L1_F_IMP2 0x00000010 /* implementation defined */
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#define L1_F_DOM(x) ((x) << 5) /* domain */
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#define L1_F_DOM_MASK L1_F_DOM(0xf)
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#define L1_F_ADDR_MASK 0xfffff000 /* phys address of L2 Table */
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#define L1_F_XSCALE_P 0x00000200 /* ECC enable for this section */
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/*
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* ARM L2 Descriptors
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*/
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#define L2_TYPE_INV 0x00 /* Invalid (fault) */
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#define L2_TYPE_L 0x01 /* Large Page */
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#define L2_TYPE_S 0x02 /* Small Page */
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#define L2_TYPE_T 0x03 /* Tiny Page */
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#define L2_TYPE_MASK 0x03 /* mask of type bits */
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/*
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* This L2 Descriptor type is available on XScale processors
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* when using a Coarse L1 Descriptor. The Extended Small
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* Descriptor has the same format as the XScale Tiny Descriptor,
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* but describes a 4K page, rather than a 1K page.
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*/
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#define L2_TYPE_XSCALE_XS 0x03 /* XScale Extended Small Page */
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#define L2_B 0x00000004 /* Bufferable page */
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#define L2_C 0x00000008 /* Cacheable page */
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#define L2_AP0(x) ((x) << 4) /* access permissions (sp 0) */
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#define L2_AP1(x) ((x) << 6) /* access permissions (sp 1) */
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#define L2_AP2(x) ((x) << 8) /* access permissions (sp 2) */
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#define L2_AP3(x) ((x) << 10) /* access permissions (sp 3) */
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#define L2_SHARED (1 << 10)
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#define L2_APX (1 << 9)
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#define L2_XN (1 << 0)
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#define L2_L_TEX_MASK (0x7 << 12) /* Type Extension */
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#define L2_L_TEX(x) (((x) & 0x7) << 12)
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#define L2_S_TEX_MASK (0x7 << 6) /* Type Extension */
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#define L2_S_TEX(x) (((x) & 0x7) << 6)
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#define L2_XSCALE_L_TEX(x) ((x) << 12) /* Type Extension */
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#define L2_XSCALE_L_S(x) (1 << 15) /* Shared */
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#define L2_XSCALE_T_TEX(x) ((x) << 6) /* Type Extension */
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/*
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* Access Permissions for L1 and L2 Descriptors.
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*/
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#define AP_W 0x01 /* writable */
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#define AP_REF 0x01 /* referenced flag */
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#define AP_U 0x02 /* user */
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/*
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* Short-hand for common AP_* constants.
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*
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* Note: These values assume the S (System) bit is set and
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* the R (ROM) bit is clear in CP15 register 1.
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*/
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#define AP_KR 0x00 /* kernel read */
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#define AP_KRW 0x01 /* kernel read/write */
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#define AP_KRWUR 0x02 /* kernel read/write usr read */
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#define AP_KRWURW 0x03 /* kernel read/write usr read/write */
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/*
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* Domain Types for the Domain Access Control Register.
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*/
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#define DOMAIN_FAULT 0x00 /* no access */
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#define DOMAIN_CLIENT 0x01 /* client */
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#define DOMAIN_RESERVED 0x02 /* reserved */
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#define DOMAIN_MANAGER 0x03 /* manager */
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/*
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* Type Extension bits for XScale processors.
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*
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* Behavior of C and B when X == 0:
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*
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* C B Cacheable Bufferable Write Policy Line Allocate Policy
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* 0 0 N N - -
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* 0 1 N Y - -
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* 1 0 Y Y Write-through Read Allocate
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* 1 1 Y Y Write-back Read Allocate
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*
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* Behavior of C and B when X == 1:
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* C B Cacheable Bufferable Write Policy Line Allocate Policy
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* 0 0 - - - - DO NOT USE
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* 0 1 N Y - -
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* 1 0 Mini-Data - - -
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* 1 1 Y Y Write-back R/W Allocate
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*/
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#define TEX_XSCALE_X 0x01 /* X modifies C and B */
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#define TEX_XSCALE_E 0x02
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#define TEX_XSCALE_T 0x04
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/* Xscale core 3 */
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/*
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*
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* Cache attributes with L2 present, S = 0
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* T E X C B L1 i-cache L1 d-cache L1 DC WP L2 cacheable write coalesce
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* 0 0 0 0 0 N N - N N
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* 0 0 0 0 1 N N - N Y
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* 0 0 0 1 0 Y Y WT N Y
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* 0 0 0 1 1 Y Y WB Y Y
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* 0 0 1 0 0 N N - Y Y
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* 0 0 1 0 1 N N - N N
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* 0 0 1 1 0 Y Y - - N
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* 0 0 1 1 1 Y Y WT Y Y
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* 0 1 0 0 0 N N - N N
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* 0 1 0 0 1 N/A N/A N/A N/A N/A
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* 0 1 0 1 0 N/A N/A N/A N/A N/A
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* 0 1 0 1 1 N/A N/A N/A N/A N/A
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* 0 1 1 X X N/A N/A N/A N/A N/A
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* 1 X 0 0 0 N N - N Y
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* 1 X 0 0 1 Y N WB N Y
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* 1 X 0 1 0 Y N WT N Y
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* 1 X 0 1 1 Y N WB Y Y
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* 1 X 1 0 0 N N - Y Y
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* 1 X 1 0 1 Y Y WB Y Y
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* 1 X 1 1 0 Y Y WT Y Y
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* 1 X 1 1 1 Y Y WB Y Y
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*
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*
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*
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*
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* Cache attributes with L2 present, S = 1
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* T E X C B L1 i-cache L1 d-cache L1 DC WP L2 cacheable write coalesce
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* 0 0 0 0 0 N N - N N
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* 0 0 0 0 1 N N - N Y
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* 0 0 0 1 0 Y Y - N Y
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* 0 0 0 1 1 Y Y WT Y Y
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* 0 0 1 0 0 N N - Y Y
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* 0 0 1 0 1 N N - N N
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* 0 0 1 1 0 Y Y - - N
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* 0 0 1 1 1 Y Y WT Y Y
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* 0 1 0 0 0 N N - N N
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* 0 1 0 0 1 N/A N/A N/A N/A N/A
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* 0 1 0 1 0 N/A N/A N/A N/A N/A
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* 0 1 0 1 1 N/A N/A N/A N/A N/A
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* 0 1 1 X X N/A N/A N/A N/A N/A
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* 1 X 0 0 0 N N - N Y
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* 1 X 0 0 1 Y N - N Y
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* 1 X 0 1 0 Y N - N Y
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* 1 X 0 1 1 Y N - Y Y
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* 1 X 1 0 0 N N - Y Y
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* 1 X 1 0 1 Y Y WT Y Y
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* 1 X 1 1 0 Y Y WT Y Y
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* 1 X 1 1 1 Y Y WT Y Y
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*/
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#endif /* !_MACHINE_PTE_H_ */
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#endif /* !ARM_NEW_PMAP */
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/* End of pte.h */
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