/**
* Donate read+write+execute memory to the exec heap.
*
* This API is specific to AMD64 and Linux/GNU. A kernel module that desires to
* use RTMemExecAlloc on AMD64 Linux/GNU will have to donate some statically
* allocated memory in the module if it wishes for GCC generated code to work.
* GCC can only generate modules that work in the address range ~2GB to ~0
* currently.
*
* The API only accept one single donation.
*
* @returns IPRT status code.
* @param pvMemory Pointer to the memory block.
* @param cb The size of the memory block.
*/
RTR0DECL(int) RTR0MemExecDonate(void *pvMemory, size_t cb)
{
int rc;
AssertReturn(g_HeapExec == NIL_RTHEAPSIMPLE, VERR_WRONG_ORDER);
rc = RTSpinlockCreate(&g_HeapExecSpinlock, RTSPINLOCK_FLAGS_INTERRUPT_SAFE, "RTR0MemExecDonate");
if (RT_SUCCESS(rc))
{
rc = RTHeapSimpleInit(&g_HeapExec, pvMemory, cb);
if (RT_FAILURE(rc))
rtR0MemExecCleanup();
}
return rc;
}
void rtR0TermNative(void)
{
#ifdef RT_ARCH_AMD64
rtR0MemExecCleanup();
#endif
}
