[PATCH] efi: Add efiload module to allow loading EFI drivers

[Glenn Washburn <development@efficientek.com>]

Signed-off-by: Glenn Washburn <development@efficientek.com>
---
 grub-core/Makefile.core.def      |   6 +
 grub-core/commands/efi/efiload.c | 212 +++++++++++++++++++++++++++++++
 2 files changed, 218 insertions(+)
 create mode 100644 grub-core/commands/efi/efiload.c

diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index a6e6b8cb135a..8a50a0365314 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -843,6 +843,12 @@ module = {
   enable = efi;
 };
 
+module = {
+  name = efiload;
+  common = commands/efi/efiload.c;
+  enable = efi;
+};
+
 module = {
   name = blocklist;
   common = commands/blocklist.c;
diff --git a/grub-core/commands/efi/efiload.c b/grub-core/commands/efi/efiload.c
new file mode 100644
index 000000000000..426ab24b6919
--- /dev/null
+++ b/grub-core/commands/efi/efiload.c
@@ -0,0 +1,212 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2019  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/efi/api.h>
+#include <grub/efi/efi.h>
+#include <grub/err.h>
+#include <grub/extcmd.h>
+#include <grub/file.h>
+#include <grub/i18n.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/types.h>
+#include <grub/efi/efiload.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+static const struct grub_arg_option options_efiload[] = {
+  {"nc", 'n', 0, N_("Loads the driver, but does not connect the driver."), 0, 0},
+  {0, 0, 0, 0, 0, 0}
+};
+
+static grub_efi_guid_t loaded_image_protocol_guid = GRUB_EFI_LOADED_IMAGE_PROTOCOL_GUID;
+
+grub_efi_status_t
+connect_all_efi (void)
+{
+  grub_efi_status_t status;
+  grub_efi_uintn_t handle_count;
+  grub_efi_handle_t *handle_buffer;
+  grub_efi_uintn_t index;
+  grub_efi_boot_services_t *b;
+  grub_dprintf ("efiload", "Connecting ...\n");
+  b = grub_efi_system_table->boot_services;
+  status = efi_call_5 (b->locate_handle_buffer,
+                       GRUB_EFI_ALL_HANDLES,
+                       NULL, NULL,
+                       &handle_count, &handle_buffer);
+
+  if (status != GRUB_EFI_SUCCESS)
+    return status;
+
+  for (index = 0; index < handle_count; index++)
+  {
+    status = efi_call_4 (b->connect_controller,
+                         handle_buffer[index], NULL, NULL, TRUE);
+  }
+
+  if (handle_buffer)
+  {
+    efi_call_1 (b->free_pool, handle_buffer);
+  }
+  return GRUB_EFI_SUCCESS;
+}
+
+grub_err_t
+grub_efi_driver_load (grub_size_t size, void *boot_image, int connect)
+{
+  grub_efi_status_t status;
+  grub_efi_handle_t driver_handle;
+  grub_efi_boot_services_t *b;
+  grub_efi_loaded_image_t *loaded_image;
+
+  b = grub_efi_system_table->boot_services;
+
+  status = efi_call_6 (b->load_image, 0, grub_efi_image_handle, NULL,
+                       boot_image, size, &driver_handle);
+  if (status != GRUB_EFI_SUCCESS)
+  {
+    if (status == GRUB_EFI_OUT_OF_RESOURCES)
+      grub_error (GRUB_ERR_OUT_OF_MEMORY, "out of resources");
+    else
+      grub_error (GRUB_ERR_BAD_OS, "cannot load image");
+    goto fail;
+  }
+  loaded_image = grub_efi_get_loaded_image (driver_handle);
+  if (! loaded_image)
+  {
+    grub_error (GRUB_ERR_BAD_OS, "no loaded image available");
+    goto fail;
+  }
+  grub_dprintf ("efiload", "Registering loaded image\n");
+  status = efi_call_3 (b->handle_protocol, driver_handle,
+                       &loaded_image_protocol_guid, (void **)&loaded_image);
+  if (status != GRUB_EFI_SUCCESS)
+  {
+    grub_printf ("Not a dirver\n");
+    goto fail;
+  }
+  grub_dprintf ("efiload", "StartImage: %p\n", boot_image);
+  status = efi_call_3 (b->start_image, driver_handle, NULL, NULL);
+  if (status != GRUB_EFI_SUCCESS)
+  {
+    grub_printf ("ERROR in StartImage\n");
+    goto fail;
+  }
+  if (connect)
+  {
+    status = connect_all_efi ();
+    if (status != GRUB_EFI_SUCCESS)
+    {
+      grub_printf ("ERROR in connect_all_efi\n");
+      goto fail;
+    }
+  }
+  grub_dprintf ("efiload", "Driver installed\n");
+  return 0;
+fail:
+  grub_error (GRUB_ERR_BAD_OS, N_("install failed."));
+  return grub_errno;
+}
+
+static grub_err_t
+grub_cmd_efiload (grub_extcmd_context_t ctxt,
+        int argc,
+        char **args)
+{
+  struct grub_arg_list *state = ctxt->state;
+  int connect = 1;
+  grub_file_t file = 0;
+  grub_efi_boot_services_t *b;
+  grub_efi_status_t status;
+  grub_efi_uintn_t pages = 0;
+  grub_ssize_t size;
+  grub_efi_physical_address_t address;
+  void *boot_image = 0;
+
+  b = grub_efi_system_table->boot_services;
+  if (argc != 1)
+    goto fail;
+
+  file = grub_file_open (args[0], GRUB_FILE_TYPE_EFI_CHAINLOADED_IMAGE);
+  if (! file)
+    goto fail;
+  size = grub_file_size (file);
+  if (!size)
+  {
+    grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), args[0]);
+    goto fail;
+  }
+  pages = (((grub_efi_uintn_t) size + ((1 << 12) - 1)) >> 12);
+  status = efi_call_4 (b->allocate_pages, GRUB_EFI_ALLOCATE_ANY_PAGES,
+                       GRUB_EFI_LOADER_CODE, pages, &address);
+  if (status != GRUB_EFI_SUCCESS)
+  {
+    grub_printf ("Failed to allocate %u pages\n", (unsigned int) pages);
+    grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
+    goto fail;
+  }
+  boot_image = (void *) ((grub_addr_t) address);
+  if (grub_file_read (file, boot_image, size) != size)
+  {
+    if (grub_errno == GRUB_ERR_NONE)
+      grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), args[0]);
+    goto fail;
+  }
+  grub_file_close (file);
+  if (state[0].set)
+    connect = 0;
+  grub_errno = grub_efi_driver_load (size, boot_image, connect);
+
+  return grub_errno;
+fail:
+  grub_printf ("ERROR\n");
+  if (file)
+    grub_file_close (file);
+  if (address)
+    efi_call_2 (b->free_pages, address, pages);
+  return 1;
+}
+
+static grub_err_t
+grub_cmd_connect (grub_extcmd_context_t ctxt __attribute__ ((unused)),
+                  int argc __attribute__ ((unused)),
+                  char **args __attribute__ ((unused)))
+{
+  connect_all_efi ();
+  return GRUB_ERR_NONE;
+}
+
+static grub_extcmd_t cmd_efiload, cmd_connect;
+
+GRUB_MOD_INIT(efiload)
+{
+  cmd_efiload = grub_register_extcmd ("efiload", grub_cmd_efiload, 0, 
+                  N_("FILE"),
+                  N_("Install UEFI driver."), options_efiload);
+  cmd_connect = grub_register_extcmd ("efi_connect_all", grub_cmd_connect, 0, 
+                  NULL, N_("Connect drivers."), 0);
+}
+
+GRUB_MOD_FINI(efiload)
+{
+  grub_unregister_extcmd (cmd_efiload);
+  grub_unregister_extcmd (cmd_connect);
+}
-- 
2.34.1


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