Add _mesa_exec_malloc() and _mesa_exec_free() for allocating

executable memory.  Based on Thomas Hellstrom's patch.
TODO: glapi.c also needs this, but cannot access this code.

1 files changed, 83 insertions, 0 deletions

diff --git a/src/mesa/main/execmem.c b/src/mesa/main/execmem.c
new file mode 100644
index 00000000000..17ad06c90a4
--- /dev/null
+++ b/src/mesa/main/execmem.c
@@ -0,0 +1,83 @@
+#include "imports.h"
+#include "glthread.h"
+
+
+
+#ifdef __linux__
+
+#include <unistd.h>
+#include <sys/mman.h>
+#include <mm.h>
+
+#define EXEC_HEAP_SIZE (128*1024)
+
+_glthread_DECLARE_STATIC_MUTEX(exec_mutex);
+
+static memHeap_t *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 *
+_mesa_exec_malloc( GLuint size )
+{
+   PMemBlock 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;
+
+   _glthread_UNLOCK_MUTEX(exec_mutex);
+   
+   return addr;
+}
+ 
+void 
+_mesa_exec_free(void *addr)
+{
+   _glthread_LOCK_MUTEX(exec_mutex);
+
+   if (exec_heap) {
+      PMemBlock block = mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem);
+   
+      if (block)
+	 mmFreeMem(block);
+   }
+
+   _glthread_UNLOCK_MUTEX(exec_mutex);
+}
+
+#else
+
+void *
+_mesa_exec_malloc( GLuint size )
+{
+   return _mesa_malloc( size );
+}
+ 
+void 
+_mesa_exec_free(void *addr)
+{
+   _mesa_free(addr);
+}
+
+#endif