Add g_alloc_mem_p to return physical allocated address

Author: maxdev1

kernel/src/kernel/calls/syscall_memory.cpp

@@ -70,10 +70,11 @@ void syscallAllocateMemory(g_task* task, g_syscall_alloc_mem* data)
 		return;
 	}
 
+	g_physical_address page = 0;
 	bool failedPhysical = false;
 	for(uint32_t i = 0; i < pages; i++)
 	{
-		g_physical_address page = memoryPhysicalAllocate();
+		page = memoryPhysicalAllocate();
 		if(!page)
 		{
 			failedPhysical = true;
@@ -96,6 +97,7 @@ void syscallAllocateMemory(g_task* task, g_syscall_alloc_mem* data)
 	}
 
 	data->virtualResult = (void*) mapped;
+	data->physicalResult = (task->securityLevel <= G_SECURITY_LEVEL_DRIVER && pages == 1) ? (void*) page : nullptr;
 }
 
 void syscallUnmap(g_task* task, g_syscall_unmap* data)

libapi/inc/ghost/memory.h

@@ -38,11 +38,16 @@ __BEGIN_C
  * @param size
  * 		the size in bytes
  *
+ * @param out_phys
+ *		optionally, the physical output, only for security-level DRIVER and only
+ *		if just one page was allocated
+ *
  * @return a pointer to the allocated memory region, or 0 if failed
  *
  * @security-level APPLICATION
  */
 void* g_alloc_mem(g_size size);
+void* g_alloc_mem_p(g_size size, void** out_phys);
 
 /**
  * Shares a memory area with another process.

libapi/inc/ghost/memory/callstructs.h

@@ -33,13 +33,19 @@
  * 		address space. this address is page-aligned. if allocation
  * 		fails, this field is 0.
  *
+ * @field physicalResult
+ *		the physical address of the allocated area, only exposed when the
+ *		executing process has security-level DRIVER and only if just one
+ *		page was allocated
+ *
  * @security-level APPLICATION
  */
 typedef struct
 {
 	g_size size;
 
 	void* virtualResult;
+	void* physicalResult;
 }__attribute__((packed)) g_syscall_alloc_mem;
 
 /**

libapi/src/memory/g_alloc_mem.cpp

@@ -34,3 +34,18 @@ void* g_alloc_mem(g_size size)
 
 	return data.virtualResult;
 }
+
+/**
+ * @see header
+ */
+void* g_alloc_mem_p(g_size size, void** out_phys)
+{
+	g_syscall_alloc_mem data;
+	data.size = size;
+
+	g_syscall(G_SYSCALL_ALLOCATE_MEMORY, (g_address) &data);
+
+	if(out_phys)
+		*out_phys = data.physicalResult;
+	return data.virtualResult;
+}