Mercurial > repos > blastem
view mem.c @ 470:541c1ae8abf3
Properly delay 68K on VDP reads. Dummy VDP test port implementation. Initial stab at handling undefined bits of VSRAM and CRAM.
author | Mike Pavone <pavone@retrodev.com> |
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date | Fri, 13 Sep 2013 19:22:46 -0700 |
parents | 140af5509ce7 |
children | b52cd6854c28 |
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/* Copyright 2013 Michael Pavone This file is part of BlastEm. BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. */ #include <sys/mman.h> #include <stddef.h> #include <stdint.h> #include <stdlib.h> #include <unistd.h> #include "mem.h" /* void * alloc_code(size_t *size) { *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1)); return mmap(NULL, *size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); } */ /* void * alloc_code(size_t *size) { char * ret = malloc(*size); char * base = (char *)(((intptr_t)ret) & (~(PAGE_SIZE-1))); mprotect(base, (ret + *size) - base, PROT_EXEC | PROT_READ | PROT_WRITE); return ret; } */ void * alloc_code(size_t *size) { *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1)); void * ret = sbrk(*size); if (ret == ((void *)-1)) { return NULL; } mprotect(ret, *size, PROT_EXEC | PROT_READ | PROT_WRITE); return ret; }