From 132d3236bb884433bf94e961f6d32264e0334aec Mon Sep 17 00:00:00 2001
From: ornitorrincos
Date: Tue, 18 Aug 2026 12:15:05 +0200
Subject: 

---
 bootloader/disk.c | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 bootloader/disk.c

(limited to 'bootloader/disk.c')

diff --git a/bootloader/disk.c b/bootloader/disk.c
new file mode 100644
index 0000000..646448e
--- /dev/null
+++ b/bootloader/disk.c
@@ -0,0 +1,98 @@
+#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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