8e90166a08
Remove the cache state logic : right now, it provides more problems than it helps. Add helper functions for mapping devices while bootstrapping. Reorganize the code a bit, and remove dead code. Obtained from: NetBSD (partially)
550 lines
17 KiB
C
550 lines
17 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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* 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 University of
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* California, Berkeley and its contributors.
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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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* from: FreeBSD: src/sys/i386/include/pmap.h,v 1.70 2000/11/30
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*
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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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#include <machine/pte.h>
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/*
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* Pte related macros
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*/
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#define PTE_NOCACHE 0
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#define PTE_CACHE 1
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#define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDR_SHIFT)+((pti)<<PAGE_SHIFT)))
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#define PTDIPDE(ptd) ((ptd)/1024)
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#define PTDIPTE(ptd) ((ptd)%256)
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#ifndef NKPT
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#define NKPT 120 /* actual number of kernel page tables */
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#endif
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#ifndef NKPDE
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#define NKPDE 1019 /* Maximum number of kernel PDE */
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#endif
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#define NPDEPTD 16 /* Number of PDE in each PTD */
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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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#define KPTDI (NPDEPG-NKPDE) /* ptd entry for kernel space begin */
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#define PTDPTDI (KPTDI-1) /* ptd entry that points to ptd! */
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#define KPTPTDI (PTDPTDI-1) /* ptd entry for kernel PTEs */
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#define UPTPTDI (KPTPTDI-3) /* ptd entry for uspace PTEs */
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#define UMAXPTDI (UPTPTDI-1) /* ptd entry for user space end */
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#define UMAXPTEOFF (NPTEPG) /* pte entry for user space end */
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#ifndef LOCORE
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#include <sys/queue.h>
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#define PDESIZE sizeof(pd_entry_t) /* for assembly files */
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#define PTESIZE sizeof(pt_entry_t) /* for assembly files */
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#ifdef _KERNEL
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#define vtophys(va) pmap_extract(pmap_kernel(), (vm_offset_t)(va))
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#define pmap_kextract(va) pmap_extract(pmap_kernel(), (vm_offset_t)(va))
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#endif
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#define pmap_page_is_mapped(m) (!TAILQ_EMPTY(&(m)->md.pv_list))
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/*
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* Pmap sutff
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*/
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/*
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* This structure is used to hold a virtual<->physical address
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* association and is used mostly by bootstrap code
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*/
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struct pv_addr {
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SLIST_ENTRY(pv_addr) pv_list;
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vm_offset_t pv_va;
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vm_paddr_t pv_pa;
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};
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struct pv_entry;
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struct md_page {
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int pvh_attrs;
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u_int uro_mappings;
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u_int urw_mappings;
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union {
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u_short s_mappings[2]; /* Assume kernel count <= 65535 */
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u_int i_mappings;
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} k_u;
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#define kro_mappings k_u.s_mappings[0]
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#define krw_mappings k_u.s_mappings[1]
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#define k_mappings k_u.i_mappings
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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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#define VM_MDPAGE_INIT(pg) \
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do { \
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TAILQ_INIT(&pg->pv_list); \
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mtx_init(&(pg)->md_page.pvh_mtx, "MDPAGE Mutex", NULL, MTX_DEV);\
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(pg)->mdpage.pvh_attrs = 0; \
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(pg)->mdpage.uro_mappings = 0; \
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(pg)->mdpage.urw_mappings = 0; \
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(pg)->mdpage.k_mappings = 0; \
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} while (/*CONSTCOND*/0)
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struct l1_ttable;
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struct l2_dtable;
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/*
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* The number of L2 descriptor tables which can be tracked by an l2_dtable.
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* A bucket size of 16 provides for 16MB of contiguous virtual address
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* space per l2_dtable. Most processes will, therefore, require only two or
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* three of these to map their whole working set.
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*/
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#define L2_BUCKET_LOG2 4
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#define L2_BUCKET_SIZE (1 << L2_BUCKET_LOG2)
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/*
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* Given the above "L2-descriptors-per-l2_dtable" constant, the number
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* of l2_dtable structures required to track all possible page descriptors
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* mappable by an L1 translation table is given by the following constants:
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*/
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#define L2_LOG2 ((32 - L1_S_SHIFT) - L2_BUCKET_LOG2)
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#define L2_SIZE (1 << L2_LOG2)
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struct pmap {
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u_int8_t pm_domain;
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struct l1_ttable *pm_l1;
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struct l2_dtable *pm_l2[L2_SIZE];
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pd_entry_t *pm_pdir; /* KVA of page directory */
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int pm_count; /* reference count */
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int pm_active; /* active on cpus */
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struct pmap_statistics pm_stats; /* pmap statictics */
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LIST_ENTRY(pmap) pm_list; /* List of all pmaps */
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};
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typedef struct pmap *pmap_t;
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#ifdef _KERNEL
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extern pmap_t kernel_pmap;
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#define pmap_kernel() kernel_pmap
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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_table.
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*/
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typedef struct pv_entry {
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pmap_t pv_pmap; /* pmap where mapping lies */
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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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vm_page_t pv_ptem; /* VM page for pte */
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int pv_flags; /* flags (wired, etc...) */
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} *pv_entry_t;
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#define PV_ENTRY_NULL ((pv_entry_t) 0)
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#define PV_CI 0x01 /* all entries must be cache inhibited */
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#define PV_PTPAGE 0x02 /* entry maps a page table page */
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/*
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* Page hooks.
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* For speed we store the both the virtual address and the page table
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* entry address for each page hook.
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*/
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typedef struct {
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vm_offset_t va;
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pt_entry_t *pte;
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} pagehook_t;
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#ifdef _KERNEL
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boolean_t pmap_get_pde_pte(pmap_t, vm_offset_t, pd_entry_t **, pt_entry_t **);
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/*
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* virtual address to page table entry and
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* to physical address. Likewise for alternate address space.
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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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/*
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* The current top of kernel VM.
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*/
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extern vm_offset_t pmap_curmaxkvaddr;
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struct pcb;
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void pmap_set_pcb_pagedir(pmap_t, struct pcb *);
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/* Virtual address to page table entry */
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static __inline pt_entry_t *
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vtopte(vm_offset_t va)
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{
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pd_entry_t *pdep;
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pt_entry_t *ptep;
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if (pmap_get_pde_pte(pmap_kernel(), va, &pdep, &ptep) == FALSE)
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return (NULL);
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return (ptep);
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}
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extern vm_offset_t avail_end;
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extern vm_offset_t clean_eva;
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extern vm_offset_t clean_sva;
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extern vm_offset_t phys_avail[];
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extern vm_offset_t virtual_avail;
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extern vm_offset_t virtual_end;
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void pmap_bootstrap(vm_offset_t, vm_offset_t, struct pv_addr *);
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void pmap_kenter(vm_offset_t va, vm_paddr_t pa);
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void pmap_kremove(vm_offset_t);
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void *pmap_mapdev(vm_offset_t, vm_size_t);
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void pmap_unmapdev(vm_offset_t, vm_size_t);
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vm_page_t pmap_use_pt(pmap_t, vm_offset_t);
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void pmap_debug(int);
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void pmap_map_section(vm_offset_t, vm_offset_t, vm_offset_t, int, int);
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void pmap_link_l2pt(vm_offset_t, vm_offset_t, struct pv_addr *);
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vm_size_t pmap_map_chunk(vm_offset_t, vm_offset_t, vm_offset_t, vm_size_t, int, int);
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void
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pmap_map_entry(vm_offset_t l1pt, vm_offset_t va, vm_offset_t pa, int prot,
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int cache);
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int pmap_fault_fixup(pmap_t, vm_offset_t, vm_prot_t, int);
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/*
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* Definitions for MMU domains
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*/
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#define PMAP_DOMAINS 15 /* 15 'user' domains (0-14) */
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#define PMAP_DOMAIN_KERNEL 15 /* The kernel uses domain #15 */
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/*
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* The new pmap ensures that page-tables are always mapping Write-Thru.
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* Thus, on some platforms we can run fast and loose and avoid syncing PTEs
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* on every change.
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*
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* Unfortunately, not all CPUs have a write-through cache mode. So we
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* define PMAP_NEEDS_PTE_SYNC for C code to conditionally do PTE syncs,
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* and if there is the chance for PTE syncs to be needed, we define
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* PMAP_INCLUDE_PTE_SYNC so e.g. assembly code can include (and run)
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* the code.
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*/
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extern int pmap_needs_pte_sync;
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/*
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* These macros define the various bit masks in the PTE.
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*
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* We use these macros since we use different bits on different processor
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* models.
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*/
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#define L1_S_PROT_U (L1_S_AP(AP_U))
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#define L1_S_PROT_W (L1_S_AP(AP_W))
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#define L1_S_PROT_MASK (L1_S_PROT_U|L1_S_PROT_W)
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#define L1_S_CACHE_MASK_generic (L1_S_B|L1_S_C)
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#define L1_S_CACHE_MASK_xscale (L1_S_B|L1_S_C|L1_S_XSCALE_TEX(TEX_XSCALE_X))
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#define L2_L_PROT_U (L2_AP(AP_U))
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#define L2_L_PROT_W (L2_AP(AP_W))
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#define L2_L_PROT_MASK (L2_L_PROT_U|L2_L_PROT_W)
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#define L2_L_CACHE_MASK_generic (L2_B|L2_C)
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#define L2_L_CACHE_MASK_xscale (L2_B|L2_C|L2_XSCALE_L_TEX(TEX_XSCALE_X))
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#define L2_S_PROT_U_generic (L2_AP(AP_U))
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#define L2_S_PROT_W_generic (L2_AP(AP_W))
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#define L2_S_PROT_MASK_generic (L2_S_PROT_U|L2_S_PROT_W)
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#define L2_S_PROT_U_xscale (L2_AP0(AP_U))
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#define L2_S_PROT_W_xscale (L2_AP0(AP_W))
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#define L2_S_PROT_MASK_xscale (L2_S_PROT_U|L2_S_PROT_W)
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#define L2_S_CACHE_MASK_generic (L2_B|L2_C)
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#define L2_S_CACHE_MASK_xscale (L2_B|L2_C|L2_XSCALE_T_TEX(TEX_XSCALE_X))
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#define L1_S_PROTO_generic (L1_TYPE_S | L1_S_IMP)
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#define L1_S_PROTO_xscale (L1_TYPE_S)
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#define L1_C_PROTO_generic (L1_TYPE_C | L1_C_IMP2)
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#define L1_C_PROTO_xscale (L1_TYPE_C)
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#define L2_L_PROTO (L2_TYPE_L)
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#define L2_S_PROTO_generic (L2_TYPE_S)
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#define L2_S_PROTO_xscale (L2_TYPE_XSCALE_XS)
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/*
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* User-visible names for the ones that vary with MMU class.
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*/
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#if ARM_NMMUS > 1
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/* More than one MMU class configured; use variables. */
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#define L2_S_PROT_U pte_l2_s_prot_u
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#define L2_S_PROT_W pte_l2_s_prot_w
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#define L2_S_PROT_MASK pte_l2_s_prot_mask
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#define L1_S_CACHE_MASK pte_l1_s_cache_mask
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#define L2_L_CACHE_MASK pte_l2_l_cache_mask
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#define L2_S_CACHE_MASK pte_l2_s_cache_mask
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#define L1_S_PROTO pte_l1_s_proto
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#define L1_C_PROTO pte_l1_c_proto
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#define L2_S_PROTO pte_l2_s_proto
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#elif (ARM_MMU_GENERIC + ARM_MMU_SA1) != 0
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#define L2_S_PROT_U L2_S_PROT_U_generic
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#define L2_S_PROT_W L2_S_PROT_W_generic
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#define L2_S_PROT_MASK L2_S_PROT_MASK_generic
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#define L1_S_CACHE_MASK L1_S_CACHE_MASK_generic
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#define L2_L_CACHE_MASK L2_L_CACHE_MASK_generic
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#define L2_S_CACHE_MASK L2_S_CACHE_MASK_generic
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#define L1_S_PROTO L1_S_PROTO_generic
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#define L1_C_PROTO L1_C_PROTO_generic
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#define L2_S_PROTO L2_S_PROTO_generic
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#elif ARM_MMU_XSCALE == 1
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#define L2_S_PROT_U L2_S_PROT_U_xscale
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#define L2_S_PROT_W L2_S_PROT_W_xscale
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#define L2_S_PROT_MASK L2_S_PROT_MASK_xscale
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#define L1_S_CACHE_MASK L1_S_CACHE_MASK_xscale
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#define L2_L_CACHE_MASK L2_L_CACHE_MASK_xscale
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#define L2_S_CACHE_MASK L2_S_CACHE_MASK_xscale
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#define L1_S_PROTO L1_S_PROTO_xscale
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#define L1_C_PROTO L1_C_PROTO_xscale
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#define L2_S_PROTO L2_S_PROTO_xscale
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#endif /* ARM_NMMUS > 1 */
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#if (ARM_MMU_SA1 == 1) && (ARM_NMMUS == 1)
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#define PMAP_NEEDS_PTE_SYNC 1
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#define PMAP_INCLUDE_PTE_SYNC
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#elif (ARM_MMU_SA1 == 0)
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#define PMAP_NEEDS_PTE_SYNC 0
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#endif
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/*
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* These macros return various bits based on kernel/user and protection.
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* Note that the compiler will usually fold these at compile time.
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*/
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#define L1_S_PROT(ku, pr) ((((ku) == PTE_USER) ? L1_S_PROT_U : 0) | \
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(((pr) & VM_PROT_WRITE) ? L1_S_PROT_W : 0))
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#define L2_L_PROT(ku, pr) ((((ku) == PTE_USER) ? L2_L_PROT_U : 0) | \
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(((pr) & VM_PROT_WRITE) ? L2_L_PROT_W : 0))
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#define L2_S_PROT(ku, pr) ((((ku) == PTE_USER) ? L2_S_PROT_U : 0) | \
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(((pr) & VM_PROT_WRITE) ? L2_S_PROT_W : 0))
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/*
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* Macros to test if a mapping is mappable with an L1 Section mapping
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* or an L2 Large Page mapping.
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*/
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#define L1_S_MAPPABLE_P(va, pa, size) \
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((((va) | (pa)) & L1_S_OFFSET) == 0 && (size) >= L1_S_SIZE)
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#define L2_L_MAPPABLE_P(va, pa, size) \
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((((va) | (pa)) & L2_L_OFFSET) == 0 && (size) >= L2_L_SIZE)
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/*
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* Provide a fallback in case we were not able to determine it at
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* compile-time.
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*/
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#ifndef PMAP_NEEDS_PTE_SYNC
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#define PMAP_NEEDS_PTE_SYNC pmap_needs_pte_sync
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#define PMAP_INCLUDE_PTE_SYNC
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#endif
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#define PTE_SYNC(pte) \
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do { \
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if (PMAP_NEEDS_PTE_SYNC) \
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cpu_dcache_wb_range((vm_offset_t)(pte), sizeof(pt_entry_t));\
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} while (/*CONSTCOND*/0)
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#define PTE_SYNC_RANGE(pte, cnt) \
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do { \
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if (PMAP_NEEDS_PTE_SYNC) { \
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cpu_dcache_wb_range((vm_offset_t)(pte), \
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(cnt) << 2); /* * sizeof(pt_entry_t) */ \
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} \
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} while (/*CONSTCOND*/0)
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extern pt_entry_t pte_l1_s_cache_mode;
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extern pt_entry_t pte_l1_s_cache_mask;
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extern pt_entry_t pte_l2_l_cache_mode;
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extern pt_entry_t pte_l2_l_cache_mask;
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extern pt_entry_t pte_l2_s_cache_mode;
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extern pt_entry_t pte_l2_s_cache_mask;
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extern pt_entry_t pte_l1_s_cache_mode_pt;
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extern pt_entry_t pte_l2_l_cache_mode_pt;
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extern pt_entry_t pte_l2_s_cache_mode_pt;
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extern pt_entry_t pte_l2_s_prot_u;
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extern pt_entry_t pte_l2_s_prot_w;
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extern pt_entry_t pte_l2_s_prot_mask;
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extern pt_entry_t pte_l1_s_proto;
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extern pt_entry_t pte_l1_c_proto;
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extern pt_entry_t pte_l2_s_proto;
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extern void (*pmap_copy_page_func)(vm_paddr_t, vm_paddr_t);
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extern void (*pmap_zero_page_func)(vm_paddr_t, int, int);
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#if (ARM_MMU_GENERIC + ARM_MMU_SA1) != 0
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void pmap_copy_page_generic(vm_paddr_t, vm_paddr_t);
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void pmap_zero_page_generic(vm_paddr_t, int, int);
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void pmap_pte_init_generic(void);
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#if defined(CPU_ARM8)
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void pmap_pte_init_arm8(void);
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#endif
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#if defined(CPU_ARM9)
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void pmap_pte_init_arm9(void);
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#endif /* CPU_ARM9 */
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#if defined(CPU_ARM10)
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void pmap_pte_init_arm10(void);
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#endif /* CPU_ARM10 */
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#endif /* (ARM_MMU_GENERIC + ARM_MMU_SA1) != 0 */
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#if /* ARM_MMU_SA1 == */1
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void pmap_pte_init_sa1(void);
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#endif /* ARM_MMU_SA1 == 1 */
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#if ARM_MMU_XSCALE == 1
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void pmap_copy_page_xscale(vm_paddr_t, vm_paddr_t);
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void pmap_zero_page_xscale(vm_paddr_t, int, int);
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void pmap_pte_init_xscale(void);
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void xscale_setup_minidata(vm_offset_t, vm_offset_t, vm_offset_t);
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void pmap_use_minicache(vm_offset_t, vm_size_t);
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#endif /* ARM_MMU_XSCALE == 1 */
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#define PTE_KERNEL 0
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#define PTE_USER 1
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#define l1pte_valid(pde) ((pde) != 0)
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#define l1pte_section_p(pde) (((pde) & L1_TYPE_MASK) == L1_TYPE_S)
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#define l1pte_page_p(pde) (((pde) & L1_TYPE_MASK) == L1_TYPE_C)
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#define l1pte_fpage_p(pde) (((pde) & L1_TYPE_MASK) == L1_TYPE_F)
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#define l2pte_index(v) (((v) & L2_ADDR_BITS) >> L2_S_SHIFT)
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#define l2pte_valid(pte) ((pte) != 0)
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#define l2pte_pa(pte) ((pte) & L2_S_FRAME)
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#define l2pte_minidata(pte) (((pte) & \
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(L2_B | L2_C | L2_XSCALE_T_TEX(TEX_XSCALE_X)))\
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== (L2_C | L2_XSCALE_T_TEX(TEX_XSCALE_X)))
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/* L1 and L2 page table macros */
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#define pmap_pde_v(pde) l1pte_valid(*(pde))
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#define pmap_pde_section(pde) l1pte_section_p(*(pde))
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#define pmap_pde_page(pde) l1pte_page_p(*(pde))
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#define pmap_pde_fpage(pde) l1pte_fpage_p(*(pde))
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#define pmap_pte_v(pte) l2pte_valid(*(pte))
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#define pmap_pte_pa(pte) l2pte_pa(*(pte))
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/* Size of the kernel part of the L1 page table */
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#define KERNEL_PD_SIZE \
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(L1_TABLE_SIZE - (KERNEL_BASE >> L1_S_SHIFT) * sizeof(pd_entry_t))
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#define PTE_PAGETABLE 2
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/*
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* Flags that indicate attributes of pages or mappings of pages.
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*
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* The PVF_MOD and PVF_REF flags are stored in the mdpage for each
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* page. PVF_WIRED, PVF_WRITE, and PVF_NC are kept in individual
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* pv_entry's for each page. They live in the same "namespace" so
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* that we can clear multiple attributes at a time.
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*
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* Note the "non-cacheable" flag generally means the page has
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* multiple mappings in a given address space.
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*/
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#define PVF_MOD 0x01 /* page is modified */
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#define PVF_REF 0x02 /* page is referenced */
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#define PVF_WIRED 0x04 /* mapping is wired */
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#define PVF_WRITE 0x08 /* mapping is writable */
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#define PVF_EXEC 0x10 /* mapping is executable */
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#define PVF_UNC 0x20 /* mapping is 'user' non-cacheable */
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#define PVF_KNC 0x40 /* mapping is 'kernel' non-cacheable */
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#define PVF_NC (PVF_UNC|PVF_KNC)
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void vector_page_setprot(int);
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void pmap_update(pmap_t);
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/*
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* This structure is used by machine-dependent code to describe
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* static mappings of devices, created at bootstrap time.
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*/
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struct pmap_devmap {
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vm_offset_t pd_va; /* virtual address */
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vm_paddr_t pd_pa; /* physical address */
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vm_size_t pd_size; /* size of region */
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vm_prot_t pd_prot; /* protection code */
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int pd_cache; /* cache attributes */
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};
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const struct pmap_devmap *pmap_devmap_find_pa(vm_paddr_t, vm_size_t);
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const struct pmap_devmap *pmap_devmap_find_va(vm_offset_t, vm_size_t);
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void pmap_devmap_bootstrap(vm_offset_t, const struct pmap_devmap *);
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void pmap_devmap_register(const struct pmap_devmap *);
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#endif /* _KERNEL */
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#endif /* !LOCORE */
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#endif /* !_MACHINE_PMAP_H_ */
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