/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2014,2016 Svatopluk Kraus <onwahe@gmail.com> * Copyright (c) 2014,2016 Michal Meloun <meloun@miracle.cz> * Copyright (c) 1991 Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department and William Jolitz of UUNET Technologies Inc. * * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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. * * The ARM version of this file was more or less based on the i386 version, * which has the following provenance... * * Derived from hp300 version by Mike Hibler, this version by William * Jolitz uses a recursive map [a pde points to the page directory] to * map the page tables using the pagetables themselves. This is done to * reduce the impact on kernel virtual memory for lots of sparse address * space, and to reduce the cost of memory to each process. * from: FreeBSD: src/sys/i386/include/pmap.h,v 1.70 2000/11/30 */ #ifndef _MACHINE_PMAP_H_ #define _MACHINE_PMAP_H_ #include <sys/systm.h> #include <sys/queue.h> #include <sys/_cpuset.h> #include <sys/_lock.h> #include <sys/_mutex.h> #include <sys/_pv_entry.h> typedef uint32_t pt1_entry_t; /* L1 table entry */ typedef uint32_t pt2_entry_t; /* L2 table entry */ typedef uint32_t ttb_entry_t; /* TTB entry */ #ifdef _KERNEL #if 0 #define PMAP_PTE_NOCACHE // Use uncached page tables #endif /* * (1) During pmap bootstrap, physical pages for L2 page tables are * allocated in advance which are used for KVA continuous mapping * starting from KERNBASE. This makes things more simple. * (2) During vm subsystem initialization, only vm subsystem itself can * allocate physical memory safely. As pmap_map() is called during * this initialization, we must be prepared for that and have some * preallocated physical pages for L2 page tables. * * Note that some more pages for L2 page tables are preallocated too * for mappings laying above VM_MAX_KERNEL_ADDRESS. */ #ifndef NKPT2PG /* * The optimal way is to define this in board configuration as * definition here must be safe enough. It means really big. * * 1 GB KVA <=> 256 kernel L2 page table pages * * From real platforms: * 1 GB physical memory <=> 10 pages is enough * 2 GB physical memory <=> 21 pages is enough */ #define NKPT2PG 32 #endif #endif /* _KERNEL */ /* * Pmap stuff */ struct md_page { TAILQ_HEAD(,pv_entry) pv_list; uint16_t pt2_wirecount[4]; vm_memattr_t pat_mode; }; struct pmap { struct mtx pm_mtx; pt1_entry_t *pm_pt1; /* KVA of pt1 */ pt2_entry_t *pm_pt2tab; /* KVA of pt2 pages table */ TAILQ_HEAD(,pv_chunk) pm_pvchunk; /* list of mappings in pmap */ cpuset_t pm_active; /* active on cpus */ struct pmap_statistics pm_stats; /* pmap statictics */ LIST_ENTRY(pmap) pm_list; /* List of all pmaps */ }; typedef struct pmap *pmap_t; #ifdef _KERNEL extern struct pmap kernel_pmap_store; #define kernel_pmap (&kernel_pmap_store) #define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx) #define PMAP_LOCK_ASSERT(pmap, type) \ mtx_assert(&(pmap)->pm_mtx, (type)) #define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx) #define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \ NULL, MTX_DEF | MTX_DUPOK) #define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx) #define PMAP_MTX(pmap) (&(pmap)->pm_mtx) #define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx) #define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx) extern ttb_entry_t pmap_kern_ttb; /* TTB for kernel pmap */ #define pmap_page_get_memattr(m) ((m)->md.pat_mode) /* * Only the following functions or macros may be used before pmap_bootstrap() * is called: pmap_kenter(), pmap_kextract(), pmap_kremove(), vtophys(), and * vtopte2(). */ void pmap_bootstrap(vm_offset_t); void pmap_kenter(vm_offset_t, vm_size_t, vm_paddr_t, int); void pmap_kremove(vm_offset_t); bool pmap_page_is_mapped(vm_page_t); bool pmap_ps_enabled(pmap_t pmap); void pmap_tlb_flush(pmap_t, vm_offset_t); void pmap_tlb_flush_range(pmap_t, vm_offset_t, vm_size_t); vm_paddr_t pmap_dump_kextract(vm_offset_t, pt2_entry_t *); int pmap_fault(pmap_t, vm_offset_t, uint32_t, int, bool); void pmap_set_tex(void); /* * Pre-bootstrap epoch functions set. */ void pmap_bootstrap_prepare(vm_paddr_t); vm_paddr_t pmap_preboot_get_pages(u_int); void pmap_preboot_map_pages(vm_paddr_t, vm_offset_t, u_int); vm_offset_t pmap_preboot_reserve_pages(u_int); vm_offset_t pmap_preboot_get_vpages(u_int); void pmap_preboot_map_attr(vm_paddr_t, vm_offset_t, vm_size_t, vm_prot_t, vm_memattr_t); void pmap_remap_vm_attr(vm_memattr_t old_attr, vm_memattr_t new_attr); extern char *_tmppt; /* poor name! */ extern vm_offset_t virtual_avail; extern vm_offset_t virtual_end; void *pmap_kenter_temporary(vm_paddr_t, int); #define pmap_page_is_write_mapped(m) (((m)->a.flags & PGA_WRITEABLE) != 0) void pmap_page_set_memattr(vm_page_t, vm_memattr_t); #define pmap_map_delete(pmap, sva, eva) pmap_remove(pmap, sva, eva) void *pmap_mapdev(vm_paddr_t, vm_size_t); void *pmap_mapdev_attr(vm_paddr_t, vm_size_t, vm_memattr_t); void pmap_unmapdev(void *, vm_size_t); struct pcb; void pmap_set_pcb_pagedir(pmap_t, struct pcb *); void pmap_kenter_device(vm_offset_t, vm_size_t, vm_paddr_t); void pmap_kremove_device(vm_offset_t, vm_size_t); vm_paddr_t pmap_kextract(vm_offset_t); #define vtophys(va) pmap_kextract((vm_offset_t)(va)) static inline int pmap_vmspace_copy(pmap_t dst_pmap __unused, pmap_t src_pmap __unused) { return (0); } #define PMAP_ENTER_QUICK_LOCKED 0x10000000 #define pmap_vm_page_alloc_check(m) #endif /* _KERNEL */ #endif /* !_MACHINE_PMAP_H_ */
