432 lines
11 KiB
C
432 lines
11 KiB
C
/*-
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* Copyright (c) 1991 Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department and William Jolitz of UUNET Technologies 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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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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* Derived from hp300 version by Mike Hibler, this version by William
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* Jolitz uses a recursive map [a pde points to the page directory] to
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* map the page tables using the pagetables themselves. This is done to
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* reduce the impact on kernel virtual memory for lots of sparse address
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* space, and to reduce the cost of memory to each process.
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*
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* from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
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* from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
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* $FreeBSD$
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*/
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#ifndef _MACHINE_PMAP_H_
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#define _MACHINE_PMAP_H_
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/*
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* Page-directory and page-table entries follow this format, with a few
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* of the fields not present here and there, depending on a lot of things.
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*/
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/* ---- Intel Nomenclature ---- */
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#define PG_V 0x001 /* P Valid */
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#define PG_RW 0x002 /* R/W Read/Write */
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#define PG_U 0x004 /* U/S User/Supervisor */
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#define PG_NC_PWT 0x008 /* PWT Write through */
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#define PG_NC_PCD 0x010 /* PCD Cache disable */
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#define PG_A 0x020 /* A Accessed */
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#define PG_M 0x040 /* D Dirty */
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#define PG_PS 0x080 /* PS Page size (0=4k,1=4M) */
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#define PG_PTE_PAT 0x080 /* PAT PAT index */
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#define PG_G 0x100 /* G Global */
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#define PG_AVAIL1 0x200 /* / Available for system */
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#define PG_AVAIL2 0x400 /* < programmers use */
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#define PG_AVAIL3 0x800 /* \ */
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#define PG_PDE_PAT 0x1000 /* PAT PAT index */
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#ifdef PAE
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#define PG_NX (1ull<<63) /* No-execute */
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#endif
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/* Our various interpretations of the above */
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#define PG_W PG_AVAIL1 /* "Wired" pseudoflag */
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#define PG_MANAGED PG_AVAIL2
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#ifdef PAE
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#define PG_FRAME (0x000ffffffffff000ull)
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#define PG_PS_FRAME (0x000fffffffe00000ull)
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#else
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#define PG_FRAME (~PAGE_MASK)
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#define PG_PS_FRAME (0xffc00000)
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#endif
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#define PG_PROT (PG_RW|PG_U) /* all protection bits . */
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#define PG_N (PG_NC_PWT|PG_NC_PCD) /* Non-cacheable */
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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. not present */
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#define PGEX_W 0x02 /* during a Write cycle */
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#define PGEX_U 0x04 /* access from User mode (UPL) */
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#define PGEX_RSV 0x08 /* reserved PTE field is non-zero */
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#define PGEX_I 0x10 /* during an instruction fetch */
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/*
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* Size of Kernel address space. This is the number of page table pages
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* (4MB each) to use for the kernel. 256 pages == 1 Gigabyte.
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* This **MUST** be a multiple of 4 (eg: 252, 256, 260, etc).
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*/
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#ifndef KVA_PAGES
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#ifdef PAE
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#define KVA_PAGES 512
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#else
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#define KVA_PAGES 256
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#endif
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#endif
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/*
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* Pte related macros
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*/
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#define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT)))
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/* Initial number of kernel page tables. */
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#ifndef NKPT
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#ifdef PAE
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/* 152 page tables needed to map 16G (76B "struct vm_page", 2M page tables). */
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#define NKPT 240
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#else
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/* 18 page tables needed to map 4G (72B "struct vm_page", 4M page tables). */
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#define NKPT 30
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#endif
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#endif
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#ifndef NKPDE
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#ifdef SMP
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#define NKPDE (KVA_PAGES - 1) /* number of page tables/pde's */
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#else
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#define NKPDE (KVA_PAGES) /* number of page tables/pde's */
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#endif
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#endif
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/*
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* The *PTDI values control the layout of virtual memory
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*
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* XXX This works for now, but I am not real happy with it, I'll fix it
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* right after I fix locore.s and the magic 28K hole
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*
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* SMP_PRIVPAGES: The per-cpu address space is 0xff80000 -> 0xffbfffff
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*/
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#ifdef SMP
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#define MPPTDI (NPDEPTD-1) /* per cpu ptd entry */
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#define KPTDI (MPPTDI-NKPDE) /* start of kernel virtual pde's */
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#else
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#define KPTDI (NPDEPTD-NKPDE)/* start of kernel virtual pde's */
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#endif /* SMP */
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#define PTDPTDI (KPTDI-NPGPTD) /* ptd entry that points to ptd! */
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/*
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* XXX doesn't really belong here I guess...
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*/
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#define ISA_HOLE_START 0xa0000
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#define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
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#ifndef LOCORE
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#include <sys/queue.h>
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#ifdef PAE
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typedef uint64_t pdpt_entry_t;
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typedef uint64_t pd_entry_t;
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typedef uint64_t pt_entry_t;
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#define PTESHIFT (3)
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#define PDESHIFT (3)
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#else
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typedef uint32_t pd_entry_t;
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typedef uint32_t pt_entry_t;
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#define PTESHIFT (2)
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#define PDESHIFT (2)
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#endif
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/*
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* Address of current and alternate address space page table maps
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* and directories.
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*/
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#ifdef _KERNEL
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extern pt_entry_t PTmap[];
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extern pd_entry_t PTD[];
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extern pd_entry_t PTDpde[];
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#ifdef PAE
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extern pdpt_entry_t *IdlePDPT;
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#endif
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extern pd_entry_t *IdlePTD; /* physical address of "Idle" state directory */
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#endif
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#ifdef _KERNEL
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/*
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* virtual address to page table entry and
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* to physical address.
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* Note: these work recursively, thus vtopte of a pte will give
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* the corresponding pde that in turn maps it.
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*/
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#define vtopte(va) (PTmap + i386_btop(va))
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#define vtophys(va) pmap_kextract((vm_offset_t)(va))
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/*
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* Routine: pmap_kextract
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* Function:
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* Extract the physical page address associated
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* kernel virtual address.
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*/
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static __inline vm_paddr_t
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pmap_kextract(vm_offset_t va)
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{
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vm_paddr_t pa;
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if ((pa = PTD[va >> PDRSHIFT]) & PG_PS) {
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pa = (pa & PG_PS_FRAME) | (va & PDRMASK);
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} else {
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pa = *vtopte(va);
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pa = (pa & PG_FRAME) | (va & PAGE_MASK);
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}
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return pa;
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}
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#ifdef PAE
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static __inline pt_entry_t
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pte_load(pt_entry_t *ptep)
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{
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pt_entry_t r;
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__asm __volatile(
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"lock; cmpxchg8b %1"
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: "=A" (r)
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: "m" (*ptep), "a" (0), "d" (0), "b" (0), "c" (0));
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return (r);
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}
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static __inline pt_entry_t
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pte_load_store(pt_entry_t *ptep, pt_entry_t v)
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{
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pt_entry_t r;
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r = *ptep;
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__asm __volatile(
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"1:\n"
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"\tlock; cmpxchg8b %1\n"
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"\tjnz 1b"
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: "+A" (r)
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: "m" (*ptep), "b" ((uint32_t)v), "c" ((uint32_t)(v >> 32)));
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return (r);
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}
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/* XXXRU move to atomic.h? */
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static __inline int
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atomic_cmpset_64(volatile uint64_t *dst, uint64_t exp, uint64_t src)
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{
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int64_t res = exp;
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__asm __volatile (
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" lock ; "
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" cmpxchg8b %2 ; "
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" setz %%al ; "
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" movzbl %%al,%0 ; "
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"# atomic_cmpset_64"
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: "+A" (res), /* 0 (result) */
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"=m" (*dst) /* 1 */
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: "m" (*dst), /* 2 */
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"b" ((uint32_t)src),
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"c" ((uint32_t)(src >> 32)));
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return (res);
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}
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#define pte_load_clear(ptep) pte_load_store((ptep), (pt_entry_t)0ULL)
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#define pte_store(ptep, pte) pte_load_store((ptep), (pt_entry_t)pte)
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extern pt_entry_t pg_nx;
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#else /* PAE */
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static __inline pt_entry_t
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pte_load(pt_entry_t *ptep)
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{
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pt_entry_t r;
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r = *ptep;
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return (r);
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}
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static __inline pt_entry_t
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pte_load_store(pt_entry_t *ptep, pt_entry_t pte)
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{
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pt_entry_t r;
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__asm __volatile(
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"xchgl %0,%1"
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: "=m" (*ptep),
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"=r" (r)
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: "1" (pte),
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"m" (*ptep));
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return (r);
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}
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#define pte_load_clear(pte) atomic_readandclear_int(pte)
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static __inline void
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pte_store(pt_entry_t *ptep, pt_entry_t pte)
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{
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*ptep = pte;
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}
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#endif /* PAE */
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#define pte_clear(ptep) pte_store((ptep), (pt_entry_t)0ULL)
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#define pde_store(pdep, pde) pte_store((pdep), (pde))
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#endif /* _KERNEL */
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/*
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* Pmap stuff
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*/
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struct pv_entry;
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struct pv_chunk;
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struct md_page {
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int pv_list_count;
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TAILQ_HEAD(,pv_entry) pv_list;
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};
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struct pmap {
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struct mtx pm_mtx;
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pd_entry_t *pm_pdir; /* KVA of page directory */
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TAILQ_HEAD(,pv_chunk) pm_pvchunk; /* list of mappings in pmap */
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u_int pm_active; /* active on cpus */
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struct pmap_statistics pm_stats; /* pmap statistics */
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LIST_ENTRY(pmap) pm_list; /* List of all pmaps */
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#ifdef PAE
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pdpt_entry_t *pm_pdpt; /* KVA of page director pointer
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table */
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#endif
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};
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typedef struct pmap *pmap_t;
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#ifdef _KERNEL
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extern struct pmap kernel_pmap_store;
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#define kernel_pmap (&kernel_pmap_store)
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#define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx)
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#define PMAP_LOCK_ASSERT(pmap, type) \
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mtx_assert(&(pmap)->pm_mtx, (type))
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#define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx)
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#define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \
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NULL, MTX_DEF | MTX_DUPOK)
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#define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx)
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#define PMAP_MTX(pmap) (&(pmap)->pm_mtx)
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#define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx)
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#define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx)
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#endif
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/*
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* For each vm_page_t, there is a list of all currently valid virtual
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* mappings of that page. An entry is a pv_entry_t, the list is pv_list.
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*/
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typedef struct pv_entry {
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vm_offset_t pv_va; /* virtual address for mapping */
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TAILQ_ENTRY(pv_entry) pv_list;
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} *pv_entry_t;
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/*
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* pv_entries are allocated in chunks per-process. This avoids the
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* need to track per-pmap assignments.
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*/
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#define _NPCM 11
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#define _NPCPV 336
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struct pv_chunk {
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pmap_t pc_pmap;
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TAILQ_ENTRY(pv_chunk) pc_list;
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uint32_t pc_map[_NPCM]; /* bitmap; 1 = free */
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uint32_t pc_spare[2];
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struct pv_entry pc_pventry[_NPCPV];
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};
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#ifdef _KERNEL
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#define NPPROVMTRR 8
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#define PPRO_VMTRRphysBase0 0x200
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#define PPRO_VMTRRphysMask0 0x201
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struct ppro_vmtrr {
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u_int64_t base, mask;
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};
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extern struct ppro_vmtrr PPro_vmtrr[NPPROVMTRR];
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extern caddr_t CADDR1;
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extern pt_entry_t *CMAP1;
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extern vm_paddr_t phys_avail[];
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extern vm_paddr_t dump_avail[];
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extern int pseflag;
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extern int pgeflag;
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extern char *ptvmmap; /* poor name! */
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extern vm_offset_t virtual_avail;
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extern vm_offset_t virtual_end;
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#define pmap_page_is_mapped(m) (!TAILQ_EMPTY(&(m)->md.pv_list))
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#define pmap_unmapbios(va, sz) pmap_unmapdev((va), (sz))
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void pmap_bootstrap(vm_paddr_t);
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int pmap_change_attr(vm_offset_t, vm_size_t, int);
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void pmap_init_pat(void);
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void pmap_kenter(vm_offset_t va, vm_paddr_t pa);
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void pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int mode);
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void *pmap_kenter_temporary(vm_paddr_t pa, int i);
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void pmap_kremove(vm_offset_t);
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void *pmap_mapbios(vm_paddr_t, vm_size_t);
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void *pmap_mapdev(vm_paddr_t, vm_size_t);
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void *pmap_mapdev_attr(vm_paddr_t, vm_size_t, int);
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void pmap_unmapdev(vm_offset_t, vm_size_t);
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pt_entry_t *pmap_pte(pmap_t, vm_offset_t) __pure2;
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void pmap_set_pg(void);
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void pmap_invalidate_page(pmap_t, vm_offset_t);
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void pmap_invalidate_range(pmap_t, vm_offset_t, vm_offset_t);
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void pmap_invalidate_all(pmap_t);
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void pmap_invalidate_cache(void);
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#endif /* _KERNEL */
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#endif /* !LOCORE */
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#endif /* !_MACHINE_PMAP_H_ */
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