170 lines
4.0 KiB
C
170 lines
4.0 KiB
C
/* $NetBSD: subr_kmem.c,v 1.2 2006/06/25 08:10:04 yamt Exp $ */
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/*-
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* Copyright (c)2006 YAMAMOTO Takashi,
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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/*
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* allocator of kernel wired memory.
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*
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* TODO:
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* - worth to have "intrsafe" version? maybe..
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: subr_kmem.c,v 1.2 2006/06/25 08:10:04 yamt Exp $");
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#include <sys/param.h>
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#include <sys/kmem.h>
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#include <sys/vmem.h>
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#include <lib/libkern/libkern.h>
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#define KMEM_QUANTUM_SIZE sizeof(void *) /* XXX */
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static vmem_t *kmem_arena;
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static vmem_addr_t kmem_backend_alloc(vmem_t *, vmem_size_t, vmem_size_t *,
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vm_flag_t);
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static void kmem_backend_free(vmem_t *, vmem_addr_t, vmem_size_t);
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static inline vm_flag_t
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kmf_to_vmf(km_flag_t kmflags)
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{
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vm_flag_t vmflags;
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KASSERT((kmflags & (KM_SLEEP|KM_NOSLEEP)) != 0);
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KASSERT((~kmflags & (KM_SLEEP|KM_NOSLEEP)) != 0);
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vmflags = 0;
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if ((kmflags & KM_SLEEP) != 0) {
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vmflags |= VM_SLEEP;
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}
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if ((kmflags & KM_NOSLEEP) != 0) {
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vmflags |= VM_NOSLEEP;
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}
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return vmflags;
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}
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/* ---- kmem API */
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/*
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* kmem_alloc: allocate wired memory.
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*
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* => must not be called from interrupt context.
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*/
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void *
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kmem_alloc(size_t size, km_flag_t kmflags)
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{
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return (void *)vmem_alloc(kmem_arena, size,
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kmf_to_vmf(kmflags) | VM_INSTANTFIT);
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}
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/*
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* kmem_zalloc: allocate wired memory.
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*
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* => must not be called from interrupt context.
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*/
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void *
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kmem_zalloc(size_t size, km_flag_t kmflags)
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{
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void *p;
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p = kmem_alloc(size, kmflags);
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if (p != NULL) {
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memset(p, 0, size);
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}
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return p;
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}
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/*
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* kmem_free: free wired memory allocated by kmem_alloc.
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*
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* => must not be called from interrupt context.
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*/
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void
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kmem_free(void *p, size_t size)
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{
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vmem_free(kmem_arena, (vmem_addr_t)p, size);
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}
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void
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kmem_init(void)
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{
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kmem_arena = vmem_create("kmem", 0, 0, KMEM_QUANTUM_SIZE,
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kmem_backend_alloc, kmem_backend_free, NULL, 0, VM_SLEEP);
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}
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size_t
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kmem_roundup_size(size_t size)
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{
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return vmem_roundup_size(kmem_arena, size);
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}
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/* ---- uvm glue */
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#include <uvm/uvm_extern.h>
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static vmem_addr_t
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kmem_backend_alloc(vmem_t *dummy, vmem_size_t size, vmem_size_t *resultsize,
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vm_flag_t vmflags)
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{
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uvm_flag_t uflags;
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KASSERT(dummy == NULL);
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KASSERT(size != 0);
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KASSERT((vmflags & (VM_SLEEP|VM_NOSLEEP)) != 0);
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KASSERT((~vmflags & (VM_SLEEP|VM_NOSLEEP)) != 0);
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if ((vmflags & VM_NOSLEEP) != 0) {
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uflags = UVM_KMF_TRYLOCK | UVM_KMF_NOWAIT;
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} else {
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uflags = UVM_KMF_WAITVA;
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}
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*resultsize = size = round_page(size);
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return (vmem_addr_t)uvm_km_alloc(kernel_map, size, 0,
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uflags | UVM_KMF_WIRED | UVM_KMF_CANFAIL);
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}
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static void
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kmem_backend_free(vmem_t *dummy, vmem_addr_t addr, vmem_size_t size)
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{
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KASSERT(dummy == NULL);
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KASSERT(addr != 0);
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KASSERT(size != 0);
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KASSERT(size == round_page(size));
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uvm_km_free(kernel_map, (vaddr_t)addr, size, UVM_KMF_WIRED);
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}
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