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* vm_alloc.h - Wrapper to various virtual memory allocation schemes |
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* (supports mmap, vm_allocate or fallbacks to malloc) |
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* |
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* Basilisk II (C) 1997-2001 Christian Bauer |
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* Basilisk II (C) 1997-2004 Christian Bauer |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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#ifdef HAVE_UNISTD_H |
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#include <unistd.h> |
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#include <sys/types.h> |
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#endif |
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#ifdef HAVE_SYS_MMAN_H |
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#include <sys/mman.h> |
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#endif |
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#ifdef HAVE_MACH_VM |
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extern "C" { |
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#include <mach/mach.h> |
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} |
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#endif |
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/* Return value of `vm_acquire' in case of an error. */ |
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#ifdef HAVE_MACH_VM |
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#endif |
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#endif |
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/* Mapping options. */ |
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#define VM_MAP_SHARED 0x01 |
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#define VM_MAP_PRIVATE 0x02 |
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#define VM_MAP_FIXED 0x04 |
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#define VM_MAP_32BIT 0x08 |
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#define VM_MAP_33BIT 0x10 |
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|
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/* Default mapping options. */ |
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#define VM_MAP_DEFAULT (VM_MAP_PRIVATE) |
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|
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/* Protection bits. */ |
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#ifdef HAVE_MACH_VM |
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#define VM_PAGE_NOACCESS VM_PROT_NONE |
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and default protection bits are read / write. The return value |
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is the actual mapping address chosen or VM_MAP_FAILED for errors. */ |
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extern void * vm_acquire(size_t size); |
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extern void * vm_acquire(size_t size, int options = VM_MAP_DEFAULT); |
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/* Allocate zero-filled memory at exactly ADDR (which must be page-aligned). |
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Returns 0 if successful, -1 on errors. */ |
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extern int vm_acquire_fixed(void * addr, size_t size); |
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extern int vm_acquire_fixed(void * addr, size_t size, int options = VM_MAP_DEFAULT); |
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/* Deallocate any mapping for the region starting at ADDR and extending |
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LEN bytes. Returns 0 if successful, -1 on errors. */ |
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extern int vm_protect(void * addr, size_t size, int prot); |
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/* Returns the size of a page. */ |
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extern int vm_get_page_size(void); |
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#endif /* VM_ALLOC_H */ |
