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6264198089
Implement uma_small_alloc() and uma_small_free() for mips that allocates pages from direct mapped memory. Uses the same mechanism as the page table page allocator, so that we allocate from KSEG0 in 32 bit, and from XKPHYS on 64 bit. Reviewed by: alc, jmallett
174 lines
6.1 KiB
C
174 lines
6.1 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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* from: src/sys/i386/include/pmap.h,v 1.65.2.2 2000/11/30 01:54:42 peter
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* JNPR: pmap.h,v 1.7.2.1 2007/09/10 07:44:12 girish
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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/vmparam.h>
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#include <machine/pte.h>
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#define NKPT 120 /* actual number of kernel page tables */
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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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/*
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* Pmap stuff
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*/
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struct pv_entry;
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struct md_page {
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int pv_list_count;
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int pv_flags;
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TAILQ_HEAD(, pv_entry) pv_list;
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};
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#define PV_TABLE_MOD 0x01 /* modified */
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#define PV_TABLE_REF 0x02 /* referenced */
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#define ASID_BITS 8
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#define ASIDGEN_BITS (32 - ASID_BITS)
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#define ASIDGEN_MASK ((1 << ASIDGEN_BITS) - 1)
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struct pmap {
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pd_entry_t *pm_segtab; /* KVA of segment table */
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TAILQ_HEAD(, pv_entry) pm_pvlist; /* list of mappings in
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* pmap */
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uint32_t pm_gen_count; /* generation count (pmap lock dropped) */
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u_int pm_retries;
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cpumask_t pm_active; /* active on cpus */
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struct {
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u_int32_t asid:ASID_BITS; /* TLB address space tag */
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u_int32_t gen:ASIDGEN_BITS; /* its generation number */
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} pm_asid[MAXSMPCPU];
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struct pmap_statistics pm_stats; /* pmap statistics */
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struct vm_page *pm_ptphint; /* pmap ptp hint */
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struct mtx pm_mtx;
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};
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typedef struct pmap *pmap_t;
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#ifdef _KERNEL
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pt_entry_t *pmap_pte(pmap_t, vm_offset_t);
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vm_offset_t pmap_kextract(vm_offset_t va);
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#define vtophys(va) pmap_kextract(((vm_offset_t) (va)))
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#define pmap_asid(pmap) (pmap)->pm_asid[PCPU_GET(cpuid)].asid
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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) 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)
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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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/*
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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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TAILQ_ENTRY(pv_entry) pv_plist;
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vm_page_t pv_ptem; /* VM page for pte */
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} *pv_entry_t;
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/*
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* physmem_desc[] is a superset of phys_avail[] and describes all the
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* memory present in the system.
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*
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* phys_avail[] is similar but does not include the memory stolen by
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* pmap_steal_memory().
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*
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* Each memory region is described by a pair of elements in the array
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* so we can describe up to (PHYS_AVAIL_ENTRIES / 2) distinct memory
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* regions.
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*/
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#define PHYS_AVAIL_ENTRIES 10
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extern vm_offset_t phys_avail[PHYS_AVAIL_ENTRIES + 2];
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extern vm_offset_t physmem_desc[PHYS_AVAIL_ENTRIES + 2];
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extern vm_offset_t virtual_avail;
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extern vm_offset_t virtual_end;
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extern vm_paddr_t dump_avail[PHYS_AVAIL_ENTRIES + 2];
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#define pmap_page_get_memattr(m) VM_MEMATTR_DEFAULT
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#define pmap_page_is_mapped(m) (!TAILQ_EMPTY(&(m)->md.pv_list))
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#define pmap_page_set_memattr(m, ma) (void)0
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void pmap_bootstrap(void);
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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_offset_t pmap_steal_memory(vm_size_t size);
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int page_is_managed(vm_offset_t pa);
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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 attr);
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void pmap_kremove(vm_offset_t va);
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void *pmap_kenter_temporary(vm_paddr_t pa, int i);
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void pmap_kenter_temporary_free(vm_paddr_t pa);
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int pmap_compute_pages_to_dump(void);
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void pmap_flush_pvcache(vm_page_t m);
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int pmap_emulate_modified(pmap_t pmap, vm_offset_t va);
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void pmap_grow_direct_page_cache(void);
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vm_page_t pmap_alloc_direct_page(unsigned int index, int req);
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#endif /* _KERNEL */
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#endif /* !LOCORE */
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#endif /* !_MACHINE_PMAP_H_ */
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