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#include <efi.h>
#include <efilib.h>
#include "disk.h"
#include "memory.h"
UINTN EFIAPI ceil2(float x)
{
UINTN ret = x;
if (x - (int)x > 0) {
x += 1;
ret = (int)x;
}
return ret;
}
void * EFIAPI LoadFile(CHAR16 * name, UINTN memtype, int32_t* filesize)
{
// ask for the protocol to handle the filesystem
EFI_GUID EfiSimpleFileSystemGuid = SIMPLE_FILE_SYSTEM_PROTOCOL;
EFI_FILE_IO_INTERFACE * FSInterface = NULL;
struct _EFI_FILE_HANDLE * fsroot = NULL;
EFI_STATUS localteprotocolstat = uefi_call_wrapper(BS->LocateProtocol, 3, &EfiSimpleFileSystemGuid, NULL, &FSInterface);
if(localteprotocolstat != EFI_SUCCESS)
{
Print(L"Failed to locate protocol\n");
}
EFI_STATUS openvolumestat = uefi_call_wrapper(FSInterface->OpenVolume, 2, FSInterface, &fsroot);
if(openvolumestat != EFI_SUCCESS)
{
Print(L"FAiled to open the volume\n");
}
struct _EFI_FILE_HANDLE * fp = NULL;
EFI_STATUS openstat = uefi_call_wrapper(fsroot->Open, 5, fsroot, &fp, name, (UINT64)1, (UINT64)1);
if(openstat != EFI_SUCCESS)
{
Print(L"Failed opening the file\n");
}
// even if the specification says that asking to open the file with insuficient memory
// reports the full file size, qemu and virtualbox implementations don't do that
// as such we need to get manually the file info
UINTN infosize = 1024;
EFI_FILE_INFO * info = AllocatePool(infosize);
EFI_GUID infoguid = EFI_FILE_INFO_ID;
EFI_STATUS infostatus = uefi_call_wrapper(fp->GetInfo, 4, fp, &infoguid, &infosize, info);
if(infostatus != EFI_SUCCESS)
{
Print(L"Failed to get FileInfo\n");
}
*filesize = info->FileSize;
UINTN size = info->FileSize;
void * data = NULL;
//data = AllocatePool(size);
//EFI_STATUS allocstatus = uefi_call_wrapper(BS->AllocatePool, 3, EfiLoaderData, size, (void**)&data);
float pages = (size/1024)/4;
UINTN ipages = ceil2(pages);
EFI_PHYSICAL_ADDRESS tmp;
EFI_STATUS allocstatus = uefi_call_wrapper(BS->AllocatePages, 4, AllocateAnyPages, memtype, ipages, &tmp);
data = (void*)tmp;
//data = AllocatePages2(size);
//if(data == NULL)
if(allocstatus != EFI_SUCCESS)
{
Print(L"Failed to get Kernel memory\n");
}
// phoenix lies, must specify the size myself
uefi_call_wrapper(fp->Read, 3, fp, &size, data);
// Print(L"Read Size: %d\n", size);
uefi_call_wrapper(fp->Close, 1, fp);
return data;
}
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