HEADmaster

1 files changed, 25 insertions, 0 deletions

diff --git a/bootloader/vmmem.c b/bootloader/vmmem.c
new file mode 100644
index 0000000..f15c9ac
--- /dev/null
+++ b/bootloader/vmmem.c
@@ -0,0 +1,25 @@
+#include "vmmem.h"
+
+//#include "paging_struct.h"
+
+
+EFI_STATUS EFIAPI SetVM(IN UINTN size, IN UINTN descriptorsize, IN UINTN descriptorversion, EFI_MEMORY_DESCRIPTOR * map, void * kernel)
+{
+
+  // the code for setting up paging should go here
+
+  // edit the memory mapping so that the uefi runtime knows about it
+
+  EFI_MEMORY_DESCRIPTOR * tmp = map;
+
+  UINTN elements = size/descriptorsize;
+  UINTN i;
+  for(i = 0; i < elements; ++i)
+  {
+    tmp = (EFI_MEMORY_DESCRIPTOR*)(((EFI_PHYSICAL_ADDRESS)tmp + descriptorsize));
+    tmp->VirtualStart = tmp->PhysicalStart;
+  }
+
+  return uefi_call_wrapper(RT->SetVirtualAddressMap, 4, size, descriptorsize, descriptorversion, map);
+}
+