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Diffstat (limited to 'src/gallium/auxiliary/rtasm/rtasm_execmem.c')
-rw-r--r-- | src/gallium/auxiliary/rtasm/rtasm_execmem.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/rtasm/rtasm_execmem.c b/src/gallium/auxiliary/rtasm/rtasm_execmem.c new file mode 100644 index 0000000000..300c1c2d9d --- /dev/null +++ b/src/gallium/auxiliary/rtasm/rtasm_execmem.c @@ -0,0 +1,135 @@ +/************************************************************************** + * + * Copyright (C) 1999-2005 Brian Paul All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN + * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + **************************************************************************/ + + +/** + * \file exemem.c + * Functions for allocating executable memory. + * + * \author Keith Whitwell + */ + + +#include "pipe/p_compiler.h" +#include "pipe/p_debug.h" +#include "pipe/p_thread.h" +#include "pipe/p_util.h" + +#include "rtasm_execmem.h" + + +#if defined(__linux__) + +/* + * Allocate a large block of memory which can hold code then dole it out + * in pieces by means of the generic memory manager code. +*/ + +#include <unistd.h> +#include <sys/mman.h> +#include "util/u_mm.h" + +#define EXEC_HEAP_SIZE (10*1024*1024) + +_glthread_DECLARE_STATIC_MUTEX(exec_mutex); + +static struct mem_block *exec_heap = NULL; +static unsigned char *exec_mem = NULL; + + +static void +init_heap(void) +{ + if (!exec_heap) + exec_heap = mmInit( 0, EXEC_HEAP_SIZE ); + + if (!exec_mem) + exec_mem = (unsigned char *) mmap(0, EXEC_HEAP_SIZE, + PROT_EXEC | PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); +} + + +void * +rtasm_exec_malloc(size_t size) +{ + struct mem_block *block = NULL; + void *addr = NULL; + + _glthread_LOCK_MUTEX(exec_mutex); + + init_heap(); + + if (exec_heap) { + size = (size + 31) & ~31; + block = mmAllocMem( exec_heap, size, 32, 0 ); + } + + if (block) + addr = exec_mem + block->ofs; + else + debug_printf("rtasm_exec_malloc failed\n"); + + _glthread_UNLOCK_MUTEX(exec_mutex); + + return addr; +} + + +void +rtasm_exec_free(void *addr) +{ + _glthread_LOCK_MUTEX(exec_mutex); + + if (exec_heap) { + struct mem_block *block = mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem); + + if (block) + mmFreeMem(block); + } + + _glthread_UNLOCK_MUTEX(exec_mutex); +} + + +#else + +/* + * Just use regular memory. + */ + +void * +rtasm_exec_malloc(size_t size) +{ + return MALLOC( size ); +} + + +void +rtasm_exec_free(void *addr) +{ + FREE(addr); +} + + +#endif |