riscv64: finalize efibind.h

There's little reason not to derive the RISCV64 version of efibind.h
from the AARCH64 version, especially as the current version is missing
required macros such as EFI_DRIVER_ENTRY_POINT() which breaks the
compilation of some drivers.

The only major difference we introduce from AARCH64 is to consider
that any toolchain that supports RISCV64 is modern enough to support
<stdint.h>. Also, as we preserve the added definition for BOOLEAN,
we guard it with an ifndef in anticipation of MSVC RISCV64 support.

We validated these changes by confirming that they now allow gnu-efi
to be used to compile a set of UEFI drivers for RISCV64.

inc/riscv64/efibind.h

@@ -1,33 +1,131 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copright (C) 2014 - 2015 Linaro Ltd.
+ * Author: Ard Biesheuvel <ard.biesheuvel@linaro.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice and this list of conditions, without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License as published by the Free Software Foundation;
+ * either version 2 of the License, or (at your option) any later version.
+ */
 
 #include <stdint.h>
 
-#define EFIAPI
-#define EFI_ERROR_MASK 0x8000000000000000
-#define EFIERR(a) (EFI_ERROR_MASK | a)
-#define INTERFACE_DECL(x) struct x
-#define MIN_ALIGNMENT_SIZE 8
-#define RUNTIMEFUNCTION
-#define VOID void
-
-typedef uint8_t BOOLEAN;
-typedef int64_t INTN;
-typedef uint64_t UINTN;
-typedef int8_t INT8;
-typedef uint8_t UINT8;
-typedef int16_t INT16;
-typedef uint16_t UINT16;
-typedef int32_t INT32;
-typedef uint32_t UINT32;
-typedef int64_t INT64;
-typedef uint64_t UINT64;
-typedef uint16_t WCHAR;
-
-#define BREAKPOINT() while(1);
-#define uefi_call_wrapper(func, va_num, ...) func(__VA_ARGS__)
+//
+// Basic EFI types of various widths
+//
+
+
+
+typedef uint64_t                UINT64;
+typedef int64_t                 INT64;
+typedef uint32_t                UINT32;
+typedef int32_t                 INT32;
+typedef uint16_t                UINT16;
+typedef int16_t                 INT16;
+typedef uint8_t                 UINT8;
+typedef int8_t                  INT8;
+#ifndef __WCHAR_TYPE__
+#define __WCHAR_TYPE__          short
+#endif
+typedef __WCHAR_TYPE__          WCHAR;
+#ifndef BOOLEAN
+typedef uint8_t                 BOOLEAN;
+#endif
+#undef VOID
+#define VOID                    void
+typedef int64_t                 INTN;
+typedef uint64_t                UINTN;
+
+#define EFI_ERROR_MASK          0x8000000000000000
+#define EFIERR(a)               (EFI_ERROR_MASK | a)
+#define EFIERR_OEM(a)           (0xc000000000000000 | a)
+
+#define BAD_POINTER             0xFBFBFBFBFBFBFBFB
+#define MAX_ADDRESS             0xFFFFFFFFFFFFFFFF
+
+#define BREAKPOINT()            while(1);
+
+//
+// Pointers must be aligned to these address to function
+//
+#define MIN_ALIGNMENT_SIZE      8
 
+#define ALIGN_VARIABLE(Value, Adjustment) \
+   (UINTN)Adjustment = 0; \
+   if((UINTN)Value % MIN_ALIGNMENT_SIZE) \
+       (UINTN)Adjustment = MIN_ALIGNMENT_SIZE - ((UINTN)Value % MIN_ALIGNMENT_SIZE); \
+   Value = (UINTN)Value + (UINTN)Adjustment
+
+//
+// Define macros to build data structure signatures from characters.
+//
 #define EFI_SIGNATURE_16(A,B)             ((A) | (B<<8))
 #define EFI_SIGNATURE_32(A,B,C,D)         (EFI_SIGNATURE_16(A,B)     | (EFI_SIGNATURE_16(C,D)     << 16))
 #define EFI_SIGNATURE_64(A,B,C,D,E,F,G,H) (EFI_SIGNATURE_32(A,B,C,D) | ((UINT64)(EFI_SIGNATURE_32(E,F,G,H)) << 32))
 
+//
+// EFIAPI - prototype calling convention for EFI function pointers
+// BOOTSERVICE - prototype for implementation of a boot service interface
+// RUNTIMESERVICE - prototype for implementation of a runtime service interface
+// RUNTIMEFUNCTION - prototype for implementation of a runtime function that is not a service
+// RUNTIME_CODE - pragma macro for declaring runtime code
+//
+#ifndef EFIAPI                  // Forces EFI calling conventions reguardless of compiler options
+#define EFIAPI                  // Substitute expresion to force C calling convention
+#endif
+#define BOOTSERVICE
+#define RUNTIMESERVICE
+#define RUNTIMEFUNCTION
+#define RUNTIME_CODE(a)         alloc_text("rtcode", a)
+#define BEGIN_RUNTIME_DATA()    data_seg("rtdata")
+#define END_RUNTIME_DATA()      data_seg("")
+
+#define VOLATILE                volatile
+#define MEMORY_FENCE            __sync_synchronize
+
+//
+// When build similiar to FW, then link everything together as
+// one big module. For the MSVC toolchain, we simply tell the
+// linker what our driver init function is using /ENTRY.
+//
+#if defined(_MSC_EXTENSIONS)
+#define EFI_DRIVER_ENTRY_POINT(InitFunction) \
+    __pragma(comment(linker, "/ENTRY:" # InitFunction))
+#else
+#define EFI_DRIVER_ENTRY_POINT(InitFunction)    \
+    UINTN                                       \
+    InitializeDriver (                          \
+        VOID    *ImageHandle,                   \
+        VOID    *SystemTable                    \
+        )                                       \
+    {                                           \
+        return InitFunction(ImageHandle,        \
+                SystemTable);                   \
+    }                                           \
+                                                \
+    EFI_STATUS efi_main(                        \
+        EFI_HANDLE image,                       \
+        EFI_SYSTEM_TABLE *systab                \
+        ) __attribute__((weak,                  \
+                alias ("InitializeDriver")));
+#endif
+
+#define LOAD_INTERNAL_DRIVER(_if, type, name, entry) \
+   (_if)->LoadInternal(type, name, entry)
+
+//
+// Some compilers don't support the forward reference construct:
+//  typedef struct XXXXX
+//
+// The following macro provide a workaround for such cases.
+#define INTERFACE_DECL(x)       struct x
+
+#define uefi_call_wrapper(func, va_num, ...) func(__VA_ARGS__)
 #define EFI_FUNCTION