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https://github.com/n64dev/cen64.git
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8b89df2fdc
Replaced all references to simulation with emulation Updated copyright year Updated .gitignore to reduce chances of random files being uploaded to the repo Added .gitattributes to normalize all text files, and to ignore binary files (which includes the logo and the NEC PDF)
70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
//
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// os/posix/alloc.c: Low-level POSIX-based allocators.
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//
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// CEN64: Cycle-Accurate Nintendo 64 Emulator.
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// Copyright (C) 2015, Tyler J. Stachecki.
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//
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// This file is subject to the terms and conditions defined in
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// 'LICENSE', which is part of this source code package.
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//
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#include "common.h"
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#include "os/common/alloc.h"
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#include <fcntl.h>
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#include <stddef.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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// Global file descriptor for allocations.
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static int zero_page_fd = -1;
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// Allocates a block of (R/W/X) memory.
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void *cen64_alloc(struct cen64_mem *m, size_t size, bool exec) {
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int flags = MAP_PRIVATE;
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if (exec)
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flags |= PROT_EXEC;
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// Use MAP_ANON on OSX because it really does not
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// enjoy trying to mmap from device files...
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#ifdef __APPLE__
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flags |= MAP_ANON;
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#endif
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if ((m->ptr = mmap(NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC,
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flags, zero_page_fd, 0)) == MAP_FAILED) {
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return NULL;
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}
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#ifdef __APPLE__
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memset(m->ptr, 0, size);
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#endif
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m->size = size;
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return m->ptr;
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}
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// Releases resources acquired by cen64_alloc_init.
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void cen64_alloc_cleanup(void) {
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#ifndef __APPLE__
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close(zero_page_fd);
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#endif
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}
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// Initializes CEN64's low-level allocator.
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int cen64_alloc_init(void) {
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#ifndef __APPLE__
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if ((zero_page_fd = open("/dev/zero", O_RDWR)) < 0)
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return -1;
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#endif
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return 0;
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}
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// Releases resources acquired by cen64_alloc.
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void cen64_free(struct cen64_mem *m) {
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munmap(m->ptr, m->size);
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}
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