170 lines
6.2 KiB
C
170 lines
6.2 KiB
C
/* $OpenBSD: pte.h,v 1.17 2023/01/20 16:01:04 deraadt Exp $ */
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/* $NetBSD: pte.h,v 1.1 2003/04/26 18:39:47 fvdl Exp $ */
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/*
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* Copyright (c) 2001 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Frank van der Linden for Wasabi Systems, Inc.
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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 for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _MACHINE_PTE_H_
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#define _MACHINE_PTE_H_
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/*
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* amd64 MMU hardware structure:
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*
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* the (first generation) amd64 MMU is a 4-level MMU which maps 2^48 bytes
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* of virtual memory. The pagesize we use is 4K (4096 [0x1000] bytes),
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* although 2M and 4M can be used as well. The indexes in the levels
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* are 9 bits wide (512 64bit entries per level), dividing the bits
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* 9-9-9-9-12.
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*
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* The top level table, called PML4, contains 512 64bit entries pointing
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* to 3rd level table. The 3rd level table is called the 'page directory
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* pointers directory' and has 512 entries pointing to page directories.
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* The 2nd level is the page directory, containing 512 pointers to
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* page table pages. Lastly, level 1 consists of pages containing 512
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* PTEs.
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*
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* Simply put, levels 4-1 all consist of pages containing 512
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* entries pointing to the next level. Level 0 is the actual PTEs
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* themselves.
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*
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* For a description on the other bits, which are i386 compatible,
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* see the i386 pte.h
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*/
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#if !defined(_LOCORE)
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/*
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* here we define the data types for PDEs and PTEs
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*/
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typedef u_int64_t pd_entry_t; /* PDE */
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typedef u_int64_t pt_entry_t; /* PTE */
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#endif
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/*
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* now we define various for playing with virtual addresses
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*/
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#define L1_SHIFT 12
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#define L2_SHIFT 21
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#define L3_SHIFT 30
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#define L4_SHIFT 39
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#define NBPD_L1 (1ULL << L1_SHIFT) /* # bytes mapped by L1 ent (4K) */
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#define NBPD_L2 (1ULL << L2_SHIFT) /* # bytes mapped by L2 ent (2MB) */
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#define NBPD_L3 (1ULL << L3_SHIFT) /* # bytes mapped by L3 ent (1G) */
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#define NBPD_L4 (1ULL << L4_SHIFT) /* # bytes mapped by L4 ent (512G) */
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#define L4_MASK 0x0000ff8000000000UL
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#define L3_MASK 0x0000007fc0000000UL
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#define L2_MASK 0x000000003fe00000UL
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#define L1_MASK 0x00000000001ff000UL
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#define L4_FRAME L4_MASK
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#define L3_FRAME (L4_FRAME|L3_MASK)
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#define L2_FRAME (L3_FRAME|L2_MASK)
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#define L1_FRAME (L2_FRAME|L1_MASK)
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#define PAGE_MASK_L2 (NBPD_L2 - 1)
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#define x86_round_pdr(x) \
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((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1))
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/*
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* PDE/PTE bits. These are no different from their i386 counterparts.
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*/
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#define PG_V 0x0000000000000001UL /* valid */
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#define PG_RO 0x0000000000000000UL /* read-only */
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#define PG_RW 0x0000000000000002UL /* read-write */
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#define PG_u 0x0000000000000004UL /* user accessible */
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#define PG_PROT 0x0000000000000006UL
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#define PG_WT 0x0000000000000008UL /* write through */
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#define PG_N 0x0000000000000010UL /* non-cacheable */
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#define PG_U 0x0000000000000020UL /* used */
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#define PG_M 0x0000000000000040UL /* modified */
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#define PG_PAT 0x0000000000000080UL /* PAT bit. (on pte) */
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#define PG_PS 0x0000000000000080UL /* 2MB page size (on pde) */
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#define PG_G 0x0000000000000100UL /* not flushed */
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#define PG_AVAIL1 0x0000000000000200UL
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#define PG_AVAIL2 0x0000000000000400UL
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#define PG_AVAIL3 0x0000000000000800UL
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#define PG_PATLG 0x0000000000001000UL /* PAT on large pages */
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#define PG_PKMASK 0x7800000000000000UL /* Protection Key Mask */
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#define PG_XO 0x0800000000000000UL /* key1 used for execute-only */
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#define PG_NX 0x8000000000000000UL /* non-executable */
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#define PG_FRAME 0x000ffffffffff000UL
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#define PG_LGFRAME 0x000fffffffe00000UL /* large (2M) page frame mask */
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#define PGK_VALUE 0xfffffffc /* key0 is normal */
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/* EPT PTE bits */
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#define EPT_R (1ULL << 0)
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#define EPT_W (1ULL << 1)
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#define EPT_X (1ULL << 2)
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#define EPT_WB (6ULL << 3)
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#define EPT_PS (1ULL << 7)
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/* Cacheability bits when we are using PAT */
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#define PG_WB (0) /* The default */
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#define PG_WC (PG_WT) /* WT and CD is WC */
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#define PG_UCMINUS (PG_N) /* UC but mtrr can override */
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#define PG_UC (PG_WT | PG_N) /* hard UC */
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/*
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* short forms of protection codes
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*/
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#define PG_KR 0x0000000000000000UL /* kernel read-only */
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#define PG_KW 0x0000000000000002UL /* kernel read-write */
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/*
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* page protection exception bits
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*/
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#define PGEX_P 0x01 /* protection violation (vs. no mapping) */
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#define PGEX_W 0x02 /* exception during a write cycle */
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#define PGEX_U 0x04 /* exception while in user mode (upl) */
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#define PGEX_I 0x10 /* instruction fetch blocked by NX */
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#define PGEX_PK 0x20 /* protection-key violation */
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#ifdef _KERNEL
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extern pt_entry_t pg_xo; /* XO pte bits using PKU key1 */
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extern pt_entry_t pg_nx; /* NX pte bit */
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extern pt_entry_t pg_g_kern; /* PG_G if glbl mappings can be used in kern */
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#endif /* _KERNEL */
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#endif /* _MACHINE_PTE_H_ */
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