mirror of https://github.com/dzavalishin/oskit/
58 lines
1.9 KiB
C
Executable File
58 lines
1.9 KiB
C
Executable File
/*
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* Copyright (c) 1996, 1998 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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* Simple address map allocation routine, similar to what POSIX mmap or
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* Mach vm_allocate would require.
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*/
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#include <errno.h>
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#include "amm.h"
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/*
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* amm_allocate looks for a range with flags AMM_FREE and modifies it to
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* have the attributes AMM_ALLOCATED|flags.
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*
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* On input, *addrp specifies a hint address at which to start searching.
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* On output, *addrp is the address chosen. Size is the amount of the
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* resource desired and flags additional application-specific attributes to
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* associate with the range.
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*
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* Returns zero on success, an error number on failure.
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*/
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int
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amm_allocate(struct amm *amm, oskit_addr_t *addrp, oskit_size_t size, int prot)
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{
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struct amm_entry *entry;
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oskit_addr_t addr;
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int rc;
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addr = *addrp;
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if (addr < AMM_MINADDR || addr >= AMM_MAXADDR)
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addr = AMM_MINADDR;
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prot &= ~(AMM_ALLOCATED|AMM_RESERVED);
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entry = amm_find_gen(amm, &addr, size, AMM_FREE, -1, 0, 0, 0);
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if (entry == 0)
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return ENOMEM;
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rc = amm_modify(amm, addr, size, AMM_ALLOCATED|prot, 0);
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if (rc == 0)
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*addrp = addr;
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return rc;
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}
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