Rewrite core of the XTLDR boot loader

Reviewed-on: xt-sys/exectos#7 Reviewed-by: Piotr Likoski <likoski@noreply.codingworkshop.git> Co-authored-by: Rafal Kupiec <belliash@codingworkshop.eu.org> Co-committed-by: Rafal Kupiec <belliash@codingworkshop.eu.org>
2024-01-09 18:51:04 +01:00
parent 44905bb71d
commit 4412d4fc98
63 changed files with 6282 additions and 2371 deletions
--- a/xtldr/efiutils.c
+++ b/xtldr/efiutils.c
@@ -0,0 +1,120 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtldr/efiutils.c
+ * DESCRIPTION:     EFI related routines for XT Boot Loader
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#include <xtldr.h>
+
+
+/**
+ * Exits EFI boot services.
+ *
+ * @param MapKey
+ *        Identifies the current memory map of the system.
+ *
+ * @return This routine returns status code.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+EFI_STATUS
+BlExitBootServices(IN UINT_PTR MapKey)
+{
+    EFI_STATUS Status;
+
+    /* Attempt to exit boot services */
+    Status = EfiSystemTable->BootServices->ExitBootServices(EfiImageHandle, MapKey);
+    if(Status != STATUS_EFI_SUCCESS)
+    {
+        /* Retry as UEFI spec says to do it twice */
+        Status = EfiSystemTable->BootServices->ExitBootServices(EfiImageHandle, MapKey);
+    }
+
+    /* Make sure boot services were successfully exited */
+    if(Status == STATUS_EFI_SUCCESS)
+    {
+        /* Mark EFI Boot Services as no longer available */
+        BlpStatus.BootServices = FALSE;
+    }
+
+    /* Return EFI status code */
+    return Status;
+}
+
+/**
+ * Checks whether SecureBoot is enabled or not.
+ *
+ * @return Numeric representation of SecureBoot status (0 = Disabled, >0 = Enabled, <0 SetupMode).
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+INT_PTR
+BlGetSecureBootStatus()
+{
+    EFI_GUID VarGuid = EFI_GLOBAL_VARIABLE_GUID;
+    INT_PTR SecureBootStatus = 0;
+    UCHAR VarValue = 0;
+    UINT_PTR Size;
+
+    Size = sizeof(VarValue);
+    if(EfiSystemTable->RuntimeServices->GetVariable(L"SecureBoot", &VarGuid,
+       NULL, &Size, &VarValue) == STATUS_EFI_SUCCESS)
+    {
+        SecureBootStatus = (INT_PTR)VarValue;
+
+        if((EfiSystemTable->RuntimeServices->GetVariable(L"SetupMode", &VarGuid,
+           NULL, &Size, &VarValue) == STATUS_EFI_SUCCESS) && VarValue != 0)
+        {
+            SecureBootStatus = -1;
+        }
+    }
+
+    /* Return SecureBoot status */
+    return SecureBootStatus;
+}
+
+/**
+ * Puts the system to sleep for the specified number of milliseconds.
+ *
+ * @param Milliseconds
+ *        Supplies the number of milliseconds to sleep.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+VOID
+BlSleepExecution(IN ULONG_PTR Milliseconds)
+{
+    EfiSystemTable->BootServices->Stall(Milliseconds * 1000);
+}
+
+/**
+ * Waits for one or more EFI events.
+ *
+ * @param NumberOfEvents
+ *        Supplies the number of events to wait for.
+ *
+ * @param Event
+ *        Supplies the array of events to wait for.
+ *
+ * @param Index
+ *        Receives the index of the event that was signaled.
+ *
+ * @return This routine returns status code.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+EFI_STATUS
+BlWaitForEfiEvent(IN UINT_PTR NumberOfEvents,
+                  IN PEFI_EVENT Event,
+                  OUT PUINT_PTR Index)
+{
+    return EfiSystemTable->BootServices->WaitForEvent(NumberOfEvents, Event, Index);
+}