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/net/drivers/emu/emunet.c | 116 +++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 grub-core/net/drivers/emu/emunet.c

(limited to 'grub-core/net/drivers/emu/emunet.c')

diff --git a/grub-core/net/drivers/emu/emunet.c b/grub-core/net/drivers/emu/emunet.c
new file mode 100644
index 0000000..b194920
--- /dev/null
+++ b/grub-core/net/drivers/emu/emunet.c
@@ -0,0 +1,116 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2010,2011,2012,2013  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/dl.h>
+#include <grub/net/netbuff.h>
+#include <grub/net.h>
+#include <grub/term.h>
+#include <grub/i18n.h>
+#include <grub/emu/net.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+static grub_err_t 
+send_card_buffer (struct grub_net_card *dev __attribute__ ((unused)),
+		  struct grub_net_buff *pack);
+
+static struct grub_net_buff *
+get_card_packet (struct grub_net_card *dev __attribute__ ((unused)));
+
+static struct grub_net_card_driver emudriver = 
+  {
+    .name = "emu",
+    .send = send_card_buffer,
+    .recv = get_card_packet
+  };
+
+static struct grub_net_card emucard = 
+  {
+    .name = "emu0",
+    .driver = &emudriver,
+    .mtu = 1500,
+    .default_address = {
+			 .type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET,
+			 {.mac = {0, 1, 2, 3, 4, 5}}
+		       },
+    .flags = 0
+  };
+
+static grub_err_t 
+send_card_buffer (struct grub_net_card *dev __attribute__ ((unused)),
+		  struct grub_net_buff *pack)
+{
+  grub_ssize_t actual;
+
+  actual = grub_emunet_send (pack->data, pack->tail - pack->data);
+  if (actual < 0)
+    return grub_error (GRUB_ERR_IO, N_("couldn't send network packet"));
+
+  return GRUB_ERR_NONE;
+}
+
+static struct grub_net_buff *
+get_card_packet (struct grub_net_card *dev __attribute__ ((unused)))
+{
+  grub_ssize_t actual;
+  struct grub_net_buff *nb;
+
+  nb = grub_netbuff_alloc (emucard.mtu + 36 + 2);
+  if (!nb)
+    return NULL;
+
+  /* Reserve 2 bytes so that 2 + 14/18 bytes of ethernet header is divisible
+     by 4. So that IP header is aligned on 4 bytes. */
+  grub_netbuff_reserve (nb, 2);
+  if (!nb)
+    {
+      grub_netbuff_free (nb);
+      return NULL;
+    }
+
+  actual = grub_emunet_receive (nb->data, emucard.mtu + 36);
+  if (actual < 0)
+    {
+      grub_netbuff_free (nb);
+      return NULL;
+    }
+  grub_netbuff_put (nb, actual);
+
+  return nb;
+}
+
+static int registered = 0;
+
+GRUB_MOD_INIT(emunet)
+{
+  if (!grub_emunet_create (&emucard.mtu))
+    {
+      grub_net_card_register (&emucard);
+      registered = 1;
+    }
+}
+
+GRUB_MOD_FINI(emunet)
+{
+  if (registered)
+    {
+      grub_emunet_close ();
+      grub_net_card_unregister (&emucard);
+      registered = 0;
+    }
+}
-- 
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