[PATCH v5 3/7] efi/libstub/riscv: add arch specific efi.h header file

[Ard Biesheuvel <ardb@kernel.org>]

From: Atish Patra <atish.patra@wdc.com>

Add the arch specific efi.h header defining the RISC-V specific glue
for the EFI stub code.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Link: https://lore.kernel.org/r/20200421033336.9663-4-atish.patra@wdc.com
[ardb: - split off from 'RISC-V: Add EFI stub support'
       - drop unused definition of VA_BITS_MIN ]
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/riscv/include/asm/efi.h | 41 ++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/arch/riscv/include/asm/efi.h b/arch/riscv/include/asm/efi.h
new file mode 100644
index 000000000000..3dc495a937da
--- /dev/null
+++ b/arch/riscv/include/asm/efi.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 Western Digital Corporation or its affiliates.
+ */
+#ifndef _ASM_EFI_H
+#define _ASM_EFI_H
+
+#include <asm/io.h>
+#include <asm/mmu_context.h>
+#include <asm/ptrace.h>
+#include <asm/tlbflush.h>
+
+/* on RISC-V, the FDT may be located anywhere in system RAM */
+static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base)
+{
+	return ULONG_MAX;
+}
+
+/* Load initrd at enough distance from DRAM start */
+static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base,
+						    unsigned long image_addr)
+{
+	return dram_base + SZ_256M;
+}
+
+#define efi_bs_call(func, ...)	efi_system_table()->boottime->func(__VA_ARGS__)
+#define efi_rt_call(func, ...)	efi_system_table()->runtime->func(__VA_ARGS__)
+#define efi_is_native()		(true)
+
+#define efi_table_attr(inst, attr)	(inst->attr)
+
+#define efi_call_proto(inst, func, ...) inst->func(inst, ##__VA_ARGS__)
+
+#define alloc_screen_info(x...)		(&screen_info)
+extern char stext_offset[];
+
+static inline void free_screen_info(struct screen_info *si)
+{
+}
+
+#endif /* _ASM_EFI_H */
-- 
2.17.1