Adding upstream version 2.06.upstream/2.06upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 158 insertions, 0 deletions

diff --git a/grub-core/commands/memrw.c b/grub-core/commands/memrw.c
new file mode 100644
index 0000000..d401a6d
--- /dev/null
+++ b/grub-core/commands/memrw.c
@@ -0,0 +1,158 @@
+/* memrw.c - command to read / write physical memory  */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2009  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/misc.h>
+#include <grub/extcmd.h>
+#include <grub/env.h>
+#include <grub/i18n.h>
+#include <grub/lockdown.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+static grub_extcmd_t cmd_read_byte, cmd_read_word, cmd_read_dword;
+static grub_command_t cmd_write_byte, cmd_write_word, cmd_write_dword;
+
+static const struct grub_arg_option options[] =
+  {
+    {0, 'v', 0, N_("Save read value into variable VARNAME."),
+     N_("VARNAME"), ARG_TYPE_STRING},
+    {0, 0, 0, 0, 0, 0}
+  };
+
+
+static grub_err_t
+grub_cmd_read (grub_extcmd_context_t ctxt, int argc, char **argv)
+{
+  grub_addr_t addr;
+  grub_uint32_t value = 0;
+  char buf[sizeof ("XXXXXXXX")];
+
+  if (argc != 1)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected"));
+
+  addr = grub_strtoul (argv[0], 0, 0);
+  switch (ctxt->extcmd->cmd->name[sizeof ("read_") - 1])
+    {
+    case 'd':
+      value = *((volatile grub_uint32_t *) addr);
+      break;
+
+    case 'w':
+      value = *((volatile grub_uint16_t *) addr);
+      break;
+
+    case 'b':
+      value = *((volatile grub_uint8_t *) addr);
+      break;
+    }
+
+  if (ctxt->state[0].set)
+    {
+      grub_snprintf (buf, sizeof (buf), "%x", value);
+      grub_env_set (ctxt->state[0].arg, buf);
+    }
+  else
+    grub_printf ("0x%x\n", value);
+
+  return 0;
+}
+
+static grub_err_t
+grub_cmd_write (grub_command_t cmd, int argc, char **argv)
+{
+  grub_addr_t addr;
+  grub_uint32_t value;
+  grub_uint32_t mask = 0xffffffff;
+
+  if (argc != 2 && argc != 3)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("two arguments expected"));
+
+  addr = grub_strtoul (argv[0], 0, 0);
+  value = grub_strtoul (argv[1], 0, 0);
+  if (argc == 3)
+    mask = grub_strtoul (argv[2], 0, 0);
+  value &= mask;
+  switch (cmd->name[sizeof ("write_") - 1])
+    {
+    case 'd':
+      if (mask != 0xffffffff)
+	*((volatile grub_uint32_t *) addr)
+	  = (*((volatile grub_uint32_t *) addr) & ~mask) | value;
+      else
+	*((volatile grub_uint32_t *) addr) = value;
+      break;
+
+    case 'w':
+      if ((mask & 0xffff) != 0xffff)
+	*((volatile grub_uint16_t *) addr)
+	  = (*((volatile grub_uint16_t *) addr) & ~mask) | value;
+      else
+	*((volatile grub_uint16_t *) addr) = value;
+      break;
+
+    case 'b':
+      if ((mask & 0xff) != 0xff)
+	*((volatile grub_uint8_t *) addr)
+	  = (*((volatile grub_uint8_t *) addr) & ~mask) | value;
+      else
+	*((volatile grub_uint8_t *) addr) = value;
+      break;
+    }
+
+  return 0;
+}
+
+GRUB_MOD_INIT(memrw)
+{
+  cmd_read_byte =
+    grub_register_extcmd ("read_byte", grub_cmd_read, 0,
+			  N_("ADDR"), N_("Read 8-bit value from ADDR."),
+			  options);
+  cmd_read_word =
+    grub_register_extcmd ("read_word", grub_cmd_read, 0,
+			  N_("ADDR"), N_("Read 16-bit value from ADDR."),
+			  options);
+  cmd_read_dword =
+    grub_register_extcmd ("read_dword", grub_cmd_read, 0,
+			  N_("ADDR"), N_("Read 32-bit value from ADDR."),
+			  options);
+  cmd_write_byte =
+    grub_register_command_lockdown ("write_byte", grub_cmd_write,
+                                    N_("ADDR VALUE [MASK]"),
+                                    N_("Write 8-bit VALUE to ADDR."));
+  cmd_write_word =
+    grub_register_command_lockdown ("write_word", grub_cmd_write,
+                                    N_("ADDR VALUE [MASK]"),
+                                    N_("Write 16-bit VALUE to ADDR."));
+  cmd_write_dword =
+    grub_register_command_lockdown ("write_dword", grub_cmd_write,
+                                    N_("ADDR VALUE [MASK]"),
+                                    N_("Write 32-bit VALUE to ADDR."));
+}
+
+GRUB_MOD_FINI(memrw)
+{
+  grub_unregister_extcmd (cmd_read_byte);
+  grub_unregister_extcmd (cmd_read_word);
+  grub_unregister_extcmd (cmd_read_dword);
+  grub_unregister_command (cmd_write_byte);
+  grub_unregister_command (cmd_write_word);
+  grub_unregister_command (cmd_write_dword);
+}