mirror of https://github.com/dzavalishin/oskit/
117 lines
3.1 KiB
C
Executable File
117 lines
3.1 KiB
C
Executable File
/*
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* Copyright (c) 1996, 1998, 1999 University of Utah and the Flux Group.
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* All rights reserved.
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*
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* This file is part of the Flux OSKit. The OSKit is free software, also known
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* as "open source;" you can redistribute it and/or modify it under the terms
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* of the GNU General Public License (GPL), version 2, as published by the Free
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* Software Foundation (FSF). To explore alternate licensing terms, contact
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* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
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*
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* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
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* received a copy of the GPL along with the OSKit; see the file COPYING. If
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* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
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*/
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/*
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* Implementation of osenv memory interface. Together with osenv_mem.c
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* in this directory, override the default memory interface defined in
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* the dev directory. This implementation is basically the same, since
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* we are not doing anything fancy. Clients of the memory interface are
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* going to get back physical memory, which is already mapped into the
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* virtual address range (by virtue of how SVM works). The difference is
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* in how I/O memory is handled. mem_map_phys maps I/O space locations
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* into the virtual range so that device drivers can access them.
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*/
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#include <oskit/c/malloc.h>
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#include <oskit/c/stdlib.h>
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#include <oskit/dev/dev.h>
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#include <oskit/com/mem.h>
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#include <oskit/com/services.h>
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#include <oskit/machine/base_vm.h>
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#include <oskit/machine/physmem.h>
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#include <svm/svm_internal.h>
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#include <oskit/machine/base_paging.h>
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static oskit_mem_t *osenv_mem;
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/*
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* Allocate memory.
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*/
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void *
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osenv_mem_alloc(oskit_size_t size, osenv_memflags_t flags, unsigned align)
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{
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void *p;
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if (osenv_mem == NULL) {
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if (oskit_lookup_first(&oskit_mem_iid, (void **)&osenv_mem))
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return NULL;
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if (osenv_mem == NULL)
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return NULL;
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}
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/*
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* NOTE that osenv flags are the same as oskit_mem flags!
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*/
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if (align > 1) {
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p = oskit_mem_alloc_aligned(osenv_mem, size, flags, align);
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} else {
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p = oskit_mem_alloc(osenv_mem, size, flags);
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}
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return p;
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}
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/*
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* Free memory.
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*/
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void
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osenv_mem_free(void *block, osenv_memflags_t flags, oskit_size_t size)
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{
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oskit_mem_free(osenv_mem, block, size, flags);
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}
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/*
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* Map physical memory into kernel virtual space.
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*/
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int
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osenv_mem_map_phys(oskit_addr_t pa, oskit_size_t size, void **addr,
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int flags)
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{
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return svm_mem_map_phys(pa, size, addr, flags);
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}
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/*
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* Return the amount of physical RAM in the machine
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*/
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oskit_addr_t
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osenv_mem_phys_max(void)
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{
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/*
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* XXX How can this possibly be useful? It makes no sense on
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* any machine in which memory does not start at zero, or is
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* not contiguous.
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*/
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return phys_mem_max;
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}
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/*
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* Return the physical address
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*/
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oskit_addr_t
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osenv_mem_get_phys(oskit_addr_t addr)
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{
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return ((oskit_addr_t)kvtophys(addr));
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}
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oskit_addr_t
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osenv_mem_get_virt(oskit_addr_t addr)
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{
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return ((oskit_addr_t)phystokv(addr));
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}
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