From 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 18:29:51 +0200
Subject: Adding upstream version 2.06.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 grub-core/kern/riscv/efi/init.c | 79 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 grub-core/kern/riscv/efi/init.c

(limited to 'grub-core/kern/riscv/efi/init.c')

diff --git a/grub-core/kern/riscv/efi/init.c b/grub-core/kern/riscv/efi/init.c
new file mode 100644
index 0000000..38795fe
--- /dev/null
+++ b/grub-core/kern/riscv/efi/init.c
@@ -0,0 +1,79 @@
+/* init.c - initialize a riscv-based EFI system */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2018 Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/env.h>
+#include <grub/kernel.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/time.h>
+#include <grub/efi/efi.h>
+#include <grub/loader.h>
+
+static grub_uint64_t timer_frequency_in_khz;
+
+static grub_uint64_t
+grub_efi_get_time_ms (void)
+{
+  grub_uint64_t tmr;
+
+#if __riscv_xlen == 64
+  asm volatile ("rdcycle %0" : "=r" (tmr));
+#else
+  grub_uint32_t lo, hi, tmp;
+  asm volatile (
+    "1:\n"
+    "rdcycleh %0\n"
+    "rdcycle %1\n"
+    "rdcycleh %2\n"
+    "bne %0, %2, 1b"
+    : "=&r" (hi), "=&r" (lo), "=&r" (tmp));
+  tmr = ((grub_uint64_t)hi << 32) | lo;
+#endif
+
+  return tmr / timer_frequency_in_khz;
+}
+
+void
+grub_machine_init (void)
+{
+  grub_uint64_t time_before, time_after;
+
+  grub_efi_init ();
+
+  /* Calculate timer frequency */
+  timer_frequency_in_khz = 1;
+  time_before = grub_efi_get_time_ms();
+  grub_efi_stall(1000);
+  time_after = grub_efi_get_time_ms();
+  timer_frequency_in_khz = time_after - time_before;
+
+  grub_install_get_time_ms (grub_efi_get_time_ms);
+}
+
+void
+grub_machine_fini (int flags)
+{
+  if (!(flags & GRUB_LOADER_FLAG_NORETURN))
+    return;
+
+  grub_efi_fini ();
+
+  if (!(flags & GRUB_LOADER_FLAG_EFI_KEEP_ALLOCATED_MEMORY))
+    grub_efi_memory_fini ();
+}
-- 
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