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/* $OpenBSD: pte.h,v 1.1 2005/04/19 21:30:18 miod Exp $ */
/*
* Copyright (c) 2005, Miodrag Vallat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* KAP page table entries.
*
* Ref/Mod bits are handled in software.
*/
/*
* First-level : Page Directory Tables (topmost 9 bits of a va)
*
* Page directory entries contain both the pa and the va of the page
* tables they point to.
*/
#define PDT_INDEX_SIZE 9
#define PDT_INDEX_SHIFT 23
#define PDT_INDEX_MASK 0xff800000
/*
* Second-level: Page Table Entries (middle 10 bits of a va)
*/
#define PT_INDEX_SIZE 10
#define PT_INDEX_SHIFT 13
#define PT_INDEX_MASK 0x007fe000
#define PG_V 0x00000001
#define PG_NV 0x00000000
#define PG_RO 0x00000002 /* read only */
#define PG_RW 0x00000000
#define PG_PROT (PG_RO | PG_S)
#define PG_S 0x00000004 /* supervisor only */
#define PG_MA 0x00000018 /* memory attributes mask */
#define PG_G 0x00000020 /* global */
/* software bits from now on... */
#define PG_W 0x00000040 /* wired */
#define PG_M 0x00000080 /* modified */
#define PG_U 0x00000100 /* referenced */
/* 0x00001e00 unused */
#define PG_FRAME 0xffffe000 /* PFN mask */
/* memory attributes */
#define PG_IO 0x00000000 /* not cached */
#define PG_CACHE 0x00000008 /* cached */
#define PG_BYTE_SHARED 0x00000010 /* byte-writeable shared */
#define PG_SHARED 0x00000018 /* non byte-writeable shared */
/*
* Page directory constants
*/
#define PDT_SIZE 4096 /* size of a page directory table */
#define PT_SIZE 4096 /* size of a page table */
#define NBR_PDE (PDT_SIZE / 8)
#define NBR_PTE (PT_SIZE / 4)
#define NBSEG (1 << PDT_INDEX_SHIFT)
#if !defined(_LOCORE)
typedef u_int32_t pt_entry_t;
typedef struct {
u_int32_t pde_pa;
pt_entry_t* pde_va;
} pd_entry_t;
#endif
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