c78952
From 778385965798ac2711f0d07d5cf521a6e999ca8b Mon Sep 17 00:00:00 2001
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From: Matthew Garrett <mjg@redhat.com>
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Date: Tue, 10 Jul 2012 11:58:52 -0400
c78952
Subject: [PATCH 082/229] Add support for linuxefi
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---
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 grub-core/Makefile.core.def       |   8 +
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 grub-core/kern/efi/mm.c           |  32 ++++
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 grub-core/loader/i386/efi/linux.c | 371 ++++++++++++++++++++++++++++++++++++++
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 include/grub/efi/efi.h            |   3 +
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 include/grub/i386/linux.h         |   1 +
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 5 files changed, 415 insertions(+)
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 create mode 100644 grub-core/loader/i386/efi/linux.c
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diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
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index 1eb86bed33b..c653c71c594 100644
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--- a/grub-core/Makefile.core.def
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+++ b/grub-core/Makefile.core.def
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@@ -1764,6 +1764,14 @@ module = {
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   enable = x86_64_efi;
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 };
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+module = {
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+  name = linuxefi;
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+  efi = loader/i386/efi/linux.c;
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+  efi = lib/cmdline.c;
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+  enable = i386_efi;
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+  enable = x86_64_efi;
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+};
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+
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 module = {
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   name = chain;
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   efi = loader/efi/chainloader.c;
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diff --git a/grub-core/kern/efi/mm.c b/grub-core/kern/efi/mm.c
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index ac2a4c556b8..f5440cb1df9 100644
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--- a/grub-core/kern/efi/mm.c
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+++ b/grub-core/kern/efi/mm.c
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@@ -49,6 +49,38 @@ static grub_efi_uintn_t finish_desc_size;
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 static grub_efi_uint32_t finish_desc_version;
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 int grub_efi_is_finished = 0;
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+/* Allocate pages below a specified address */
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+void *
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+grub_efi_allocate_pages_max (grub_efi_physical_address_t max,
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+			     grub_efi_uintn_t pages)
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+{
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+  grub_efi_status_t status;
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+  grub_efi_boot_services_t *b;
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+  grub_efi_physical_address_t address = max;
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+
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+  if (max > 0xffffffff)
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+    return 0;
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+
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+  b = grub_efi_system_table->boot_services;
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+  status = efi_call_4 (b->allocate_pages, GRUB_EFI_ALLOCATE_MAX_ADDRESS, GRUB_EFI_LOADER_DATA, pages, &address);
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+
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+  if (status != GRUB_EFI_SUCCESS)
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+    return 0;
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+
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+  if (address == 0)
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+    {
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+      /* Uggh, the address 0 was allocated... This is too annoying,
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+	 so reallocate another one.  */
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+      address = max;
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+      status = efi_call_4 (b->allocate_pages, GRUB_EFI_ALLOCATE_MAX_ADDRESS, GRUB_EFI_LOADER_DATA, pages, &address);
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+      grub_efi_free_pages (0, pages);
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+      if (status != GRUB_EFI_SUCCESS)
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+	return 0;
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+    }
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+
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+  return (void *) ((grub_addr_t) address);
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+}
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+
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 /* Allocate pages. Return the pointer to the first of allocated pages.  */
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 void *
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 grub_efi_allocate_pages_real (grub_efi_physical_address_t address,
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diff --git a/grub-core/loader/i386/efi/linux.c b/grub-core/loader/i386/efi/linux.c
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new file mode 100644
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index 00000000000..b79e6320ba9
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--- /dev/null
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+++ b/grub-core/loader/i386/efi/linux.c
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@@ -0,0 +1,371 @@
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+/*
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+ *  GRUB  --  GRand Unified Bootloader
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+ *  Copyright (C) 2012  Free Software Foundation, Inc.
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+ *
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+ *  GRUB is free software: you can redistribute it and/or modify
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+ *  it under the terms of the GNU General Public License as published by
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+ *  the Free Software Foundation, either version 3 of the License, or
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+ *  (at your option) any later version.
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+ *
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+ *  GRUB is distributed in the hope that it will be useful,
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+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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+ *  GNU General Public License for more details.
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+ *
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+ *  You should have received a copy of the GNU General Public License
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+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
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+ */
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+
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+#include <grub/loader.h>
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+#include <grub/file.h>
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+#include <grub/err.h>
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+#include <grub/types.h>
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+#include <grub/mm.h>
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+#include <grub/cpu/linux.h>
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+#include <grub/command.h>
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+#include <grub/i18n.h>
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+#include <grub/lib/cmdline.h>
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+#include <grub/efi/efi.h>
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+
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+GRUB_MOD_LICENSE ("GPLv3+");
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+
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+static grub_dl_t my_mod;
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+static int loaded;
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+static void *kernel_mem;
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+static grub_uint64_t kernel_size;
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+static grub_uint8_t *initrd_mem;
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+static grub_uint32_t handover_offset;
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+struct linux_kernel_params *params;
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+static char *linux_cmdline;
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+
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+#define BYTES_TO_PAGES(bytes)   (((bytes) + 0xfff) >> 12)
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+
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+#define SHIM_LOCK_GUID \
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+  { 0x605dab50, 0xe046, 0x4300, {0xab, 0xb6, 0x3d, 0xd8, 0x10, 0xdd, 0x8b, 0x23} }
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+
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+struct grub_efi_shim_lock
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+{
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+  grub_efi_status_t (*verify) (void *buffer, grub_uint32_t size);
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+};
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+typedef struct grub_efi_shim_lock grub_efi_shim_lock_t;
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+
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+static grub_efi_boolean_t
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+grub_linuxefi_secure_validate (void *data, grub_uint32_t size)
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+{
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+  grub_efi_guid_t guid = SHIM_LOCK_GUID;
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+  grub_efi_shim_lock_t *shim_lock;
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+
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+  shim_lock = grub_efi_locate_protocol(&guid, NULL);
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+
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+  if (!shim_lock)
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+    return 1;
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+
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+  if (shim_lock->verify(data, size) == GRUB_EFI_SUCCESS)
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+    return 1;
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+
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+  return 0;
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+}
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+
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+typedef void(*handover_func)(void *, grub_efi_system_table_t *, struct linux_kernel_params *);
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+
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+static grub_err_t
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+grub_linuxefi_boot (void)
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+{
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+  handover_func hf;
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+  int offset = 0;
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+
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+#ifdef __x86_64__
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+  offset = 512;
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+#endif
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+
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+  hf = (handover_func)((char *)kernel_mem + handover_offset + offset);
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+
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+  asm volatile ("cli");
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+
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+  hf (grub_efi_image_handle, grub_efi_system_table, params);
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+
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+  /* Not reached */
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+  return GRUB_ERR_NONE;
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+}
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+
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+static grub_err_t
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+grub_linuxefi_unload (void)
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+{
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+  grub_dl_unref (my_mod);
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+  loaded = 0;
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+  if (initrd_mem)
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+    grub_efi_free_pages((grub_efi_physical_address_t)initrd_mem, BYTES_TO_PAGES(params->ramdisk_size));
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+  if (linux_cmdline)
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+    grub_efi_free_pages((grub_efi_physical_address_t)linux_cmdline, BYTES_TO_PAGES(params->cmdline_size + 1));
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+  if (kernel_mem)
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+    grub_efi_free_pages((grub_efi_physical_address_t)kernel_mem, BYTES_TO_PAGES(kernel_size));
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+  if (params)
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+    grub_efi_free_pages((grub_efi_physical_address_t)params, BYTES_TO_PAGES(16384));
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+  return GRUB_ERR_NONE;
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+}
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+
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+static grub_err_t
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+grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
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+                 int argc, char *argv[])
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+{
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+  grub_file_t *files = 0;
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+  int i, nfiles = 0;
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+  grub_size_t size = 0;
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+  grub_uint8_t *ptr;
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+
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+  if (argc == 0)
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+    {
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+      grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
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+      goto fail;
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+    }
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+
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+  if (!loaded)
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+    {
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+      grub_error (GRUB_ERR_BAD_ARGUMENT, N_("you need to load the kernel first"));
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+      goto fail;
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+    }
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+
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+  files = grub_zalloc (argc * sizeof (files[0]));
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+  if (!files)
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+    goto fail;
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+
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+  for (i = 0; i < argc; i++)
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+    {
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+      grub_file_filter_disable_compression ();
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+      files[i] = grub_file_open (argv[i]);
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+      if (! files[i])
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+        goto fail;
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+      nfiles++;
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+      size += ALIGN_UP (grub_file_size (files[i]), 4);
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+    }
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+
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+  initrd_mem = grub_efi_allocate_pages_max (0x3fffffff, BYTES_TO_PAGES(size));
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+
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+  if (!initrd_mem)
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+    {
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+      grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate initrd"));
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+      goto fail;
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+    }
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+
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+  params->ramdisk_size = size;
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+  params->ramdisk_image = (grub_uint32_t)(grub_uint64_t) initrd_mem;
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+
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+  ptr = initrd_mem;
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+
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+  for (i = 0; i < nfiles; i++)
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+    {
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+      grub_ssize_t cursize = grub_file_size (files[i]);
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+      if (grub_file_read (files[i], ptr, cursize) != cursize)
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+        {
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+          if (!grub_errno)
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+            grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"),
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+                        argv[i]);
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+          goto fail;
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+        }
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+      ptr += cursize;
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+      grub_memset (ptr, 0, ALIGN_UP_OVERHEAD (cursize, 4));
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+      ptr += ALIGN_UP_OVERHEAD (cursize, 4);
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+    }
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+
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+  params->ramdisk_size = size;
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+
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+ fail:
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+  for (i = 0; i < nfiles; i++)
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+    grub_file_close (files[i]);
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+  grub_free (files);
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+
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+  if (initrd_mem && grub_errno)
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+    grub_efi_free_pages((grub_efi_physical_address_t)initrd_mem, BYTES_TO_PAGES(size));
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+
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+  return grub_errno;
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+}
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+
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+static grub_err_t
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+grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
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+		int argc, char *argv[])
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+{
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+  grub_file_t file = 0;
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+  struct linux_kernel_header lh;
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+  grub_ssize_t len, start, filelen;
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+  void *kernel;
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+
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+  grub_dl_ref (my_mod);
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+
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+  if (argc == 0)
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+    {
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+      grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
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+      goto fail;
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+    }
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+
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+  file = grub_file_open (argv[0]);
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+  if (! file)
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+    goto fail;
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+
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+  filelen = grub_file_size (file);
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+
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+  kernel = grub_malloc(filelen);
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+
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+  if (!kernel)
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+    {
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+      grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("cannot allocate kernel buffer"));
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+      goto fail;
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+    }
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+
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+  if (grub_file_read (file, kernel, filelen) != filelen)
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+    {
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+      grub_error (GRUB_ERR_FILE_READ_ERROR, N_("Can't read kernel %s"), argv[0]);
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+      goto fail;
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+    }
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+
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+  if (! grub_linuxefi_secure_validate (kernel, filelen))
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+    {
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+      grub_error (GRUB_ERR_INVALID_COMMAND, N_("%s has invalid signature"), argv[0]);
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+      grub_free (kernel);
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+      goto fail;
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+    }
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+
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+  grub_file_seek (file, 0);
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+
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+  grub_free(kernel);
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+
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+  params = grub_efi_allocate_pages_max (0x3fffffff, BYTES_TO_PAGES(16384));
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+
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+  if (! params)
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+    {
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+      grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate kernel parameters");
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+      goto fail;
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+    }
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+
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+  memset (params, 0, 16384);
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+
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+  if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh))
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+    {
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+      if (!grub_errno)
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+	grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
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+		    argv[0]);
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+      goto fail;
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+    }
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+
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+  if (lh.boot_flag != grub_cpu_to_le16 (0xaa55))
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+    {
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+      grub_error (GRUB_ERR_BAD_OS, N_("invalid magic number"));
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+      goto fail;
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+    }
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+
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+  if (lh.setup_sects > GRUB_LINUX_MAX_SETUP_SECTS)
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+    {
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+      grub_error (GRUB_ERR_BAD_OS, N_("too many setup sectors"));
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+      goto fail;
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+    }
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+
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+  if (lh.version < grub_cpu_to_le16 (0x020b))
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+    {
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+      grub_error (GRUB_ERR_BAD_OS, N_("kernel too old"));
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+      goto fail;
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+    }
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+
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+  if (!lh.handover_offset)
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+    {
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+      grub_error (GRUB_ERR_BAD_OS, N_("kernel doesn't support EFI handover"));
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+      goto fail;
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+    }
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+
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+  linux_cmdline = grub_efi_allocate_pages_max(0x3fffffff,
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+					 BYTES_TO_PAGES(lh.cmdline_size + 1));
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+
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+  if (!linux_cmdline)
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+    {
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+      grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate cmdline"));
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+      goto fail;
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+    }
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+
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+  grub_memcpy (linux_cmdline, LINUX_IMAGE, sizeof (LINUX_IMAGE));
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+  grub_create_loader_cmdline (argc, argv,
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+                              linux_cmdline + sizeof (LINUX_IMAGE) - 1,
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+			      lh.cmdline_size - (sizeof (LINUX_IMAGE) - 1));
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+
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+  lh.cmd_line_ptr = (grub_uint32_t)(grub_uint64_t)linux_cmdline;
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+
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+  handover_offset = lh.handover_offset;
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+
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+  start = (lh.setup_sects + 1) * 512;
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+  len = grub_file_size(file) - start;
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+
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+  kernel_mem = grub_efi_allocate_pages(lh.pref_address,
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+				       BYTES_TO_PAGES(lh.init_size));
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+
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+  if (!kernel_mem)
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+    kernel_mem = grub_efi_allocate_pages_max(0x3fffffff,
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+					     BYTES_TO_PAGES(lh.init_size));
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+
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+  if (!kernel_mem)
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+    {
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+      grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate kernel"));
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+      goto fail;
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+    }
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+
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+  if (grub_file_seek (file, start) == (grub_off_t) -1)
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+    {
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+      grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
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+		  argv[0]);
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+      goto fail;
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+    }
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+
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+  if (grub_file_read (file, kernel_mem, len) != len && !grub_errno)
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+    {
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+      grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
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+		  argv[0]);
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+    }
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+
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+  if (grub_errno == GRUB_ERR_NONE)
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+    {
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+      grub_loader_set (grub_linuxefi_boot, grub_linuxefi_unload, 0);
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+      loaded = 1;
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+      lh.code32_start = (grub_uint32_t)(grub_uint64_t) kernel_mem;
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+    }
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+
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+  memcpy(params, &lh, 2 * 512);
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+
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+  params->type_of_loader = 0x21;
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+
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+ fail:
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+
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+  if (file)
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+    grub_file_close (file);
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+
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+  if (grub_errno != GRUB_ERR_NONE)
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+    {
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+      grub_dl_unref (my_mod);
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+      loaded = 0;
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+    }
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+
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+  if (linux_cmdline && !loaded)
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+    grub_efi_free_pages((grub_efi_physical_address_t)linux_cmdline, BYTES_TO_PAGES(lh.cmdline_size + 1));
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+
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+  if (kernel_mem && !loaded)
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+    grub_efi_free_pages((grub_efi_physical_address_t)kernel_mem, BYTES_TO_PAGES(kernel_size));
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+
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+  if (params && !loaded)
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+    grub_efi_free_pages((grub_efi_physical_address_t)params, BYTES_TO_PAGES(16384));
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+
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+  return grub_errno;
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+}
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+
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+static grub_command_t cmd_linux, cmd_initrd;
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+
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+GRUB_MOD_INIT(linuxefi)
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+{
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+  cmd_linux =
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+    grub_register_command ("linuxefi", grub_cmd_linux,
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+                           0, N_("Load Linux."));
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+  cmd_initrd =
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+    grub_register_command ("initrdefi", grub_cmd_initrd,
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+                           0, N_("Load initrd."));
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+  my_mod = mod;
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+}
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+
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+GRUB_MOD_FINI(linuxefi)
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+{
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+  grub_unregister_command (cmd_linux);
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+  grub_unregister_command (cmd_initrd);
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+}
481bf3
diff --git a/include/grub/efi/efi.h b/include/grub/efi/efi.h
ec4acb
index 3fa082816ca..91e29ce66f1 100644
481bf3
--- a/include/grub/efi/efi.h
481bf3
+++ b/include/grub/efi/efi.h
6f1e3d
@@ -47,6 +47,9 @@ EXPORT_FUNC(grub_efi_allocate_fixed) (grub_efi_physical_address_t address,
481bf3
 				      grub_efi_uintn_t pages);
bbc6a8
 void *
6f1e3d
 EXPORT_FUNC(grub_efi_allocate_any_pages) (grub_efi_uintn_t pages);
6f1e3d
+void *
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+EXPORT_FUNC(grub_efi_allocate_pages_max) (grub_efi_physical_address_t max,
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+					  grub_efi_uintn_t pages);
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 void EXPORT_FUNC(grub_efi_free_pages) (grub_efi_physical_address_t address,
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 				       grub_efi_uintn_t pages);
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 int
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diff --git a/include/grub/i386/linux.h b/include/grub/i386/linux.h
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index da0ca3b83cd..fc36bdaf367 100644
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--- a/include/grub/i386/linux.h
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+++ b/include/grub/i386/linux.h
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@@ -139,6 +139,7 @@ struct linux_kernel_header
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   grub_uint64_t setup_data;
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   grub_uint64_t pref_address;
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   grub_uint32_t init_size;
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+  grub_uint32_t handover_offset;
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 } GRUB_PACKED;
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 /* Boot parameters for Linux based on 2.6.12. This is used by the setup
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-- 
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2.15.0
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