Re: [Xen-devel] [PATCH v3 2/4] arm64: Add xen_boot module file

[Fu Wei <fu.wei@xxxxxxxxxx>]

Hi Vladimir,

yes, Thanks for your modification :-)

I just follow the xen boot protocol :
http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions/Multiboot

xen_module is just for "--type" option, I will discuss this with Xen
developer for this.
If we need this option, I will resubmit  it :-)

Great thanks!

On 29 October 2015 at 22:27, Vladimir 'Ï-coder/phcoder' Serbinenko
<phcoder@xxxxxxxxx> wrote:
> Committed without the xen_module command. Its argument parsing was
> non-trivial and I don't quite get what its intent is. Can you resubmit?
> On 23.07.2015 07:16, fu.wei@xxxxxxxxxx wrote:
>> From: Fu Wei <fu.wei@xxxxxxxxxx>
>>
>> grub-core/loader/arm64/xen_boot.c
>>
>>   - This adds support for the Xen boot on ARM specification for arm64.
>>   - Introduce xen_hypervisor, xen_linux, xen_initrd and xen_xsm
>>     to load different binaries for xen boot;
>>     Introduce xen_module to load common or custom module for xen boot.
>>   - This Xen boot support is a separated  module for aarch64,
>>     but reuse the existing code of devicetree in linux module.
>>
>> Signed-off-by: Fu Wei <fu.wei@xxxxxxxxxx>
>> ---
>>  grub-core/Makefile.core.def       |   7 +
>>  grub-core/loader/arm64/xen_boot.c | 685 
>> ++++++++++++++++++++++++++++++++++++++
>>  2 files changed, 692 insertions(+)
>>
>> diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
>> index a6101de..796f7e9 100644
>> --- a/grub-core/Makefile.core.def
>> +++ b/grub-core/Makefile.core.def
>> @@ -1648,6 +1648,13 @@ module = {
>>  };
>>
>>  module = {
>> +  name = xen_boot;
>> +  common = lib/cmdline.c;
>> +  arm64 = loader/arm64/xen_boot.c;
>> +  enable = arm64;
>> +};
>> +
>> +module = {
>>    name = linux;
>>    x86 = loader/i386/linux.c;
>>    xen = loader/i386/xen.c;
>> diff --git a/grub-core/loader/arm64/xen_boot.c 
>> b/grub-core/loader/arm64/xen_boot.c
>> new file mode 100644
>> index 0000000..33a65dd
>> --- /dev/null
>> +++ b/grub-core/loader/arm64/xen_boot.c
>> @@ -0,0 +1,685 @@
>> +/*
>> + *  GRUB  --  GRand Unified Bootloader
>> + *  Copyright (C) 2014  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/cache.h>
>> +#include <grub/charset.h>
>> +#include <grub/command.h>
>> +#include <grub/err.h>
>> +#include <grub/file.h>
>> +#include <grub/fdt.h>
>> +#include <grub/linux.h>
>> +#include <grub/list.h>
>> +#include <grub/loader.h>
>> +#include <grub/misc.h>
>> +#include <grub/mm.h>
>> +#include <grub/types.h>
>> +#include <grub/cpu/linux.h>
>> +#include <grub/efi/efi.h>
>> +#include <grub/efi/pe32.h>   /* required by struct xen_hypervisor_header */
>> +#include <grub/i18n.h>
>> +#include <grub/lib/cmdline.h>
>> +
>> +GRUB_MOD_LICENSE ("GPLv3+");
>> +
>> +#define XEN_HYPERVISOR_NAME  "xen_hypervisor"
>> +
>> +#define MODULE_DEFAULT_ALIGN  (0x0)
>> +#define MODULE_IMAGE_MIN_ALIGN  MODULE_DEFAULT_ALIGN
>> +#define MODULE_INITRD_MIN_ALIGN  MODULE_DEFAULT_ALIGN
>> +#define MODULE_XSM_MIN_ALIGN  MODULE_DEFAULT_ALIGN
>> +#define MODULE_CUSTOM_MIN_ALIGN  MODULE_DEFAULT_ALIGN
>> +
>> +/* #define MODULE_IMAGE_COMPATIBLE  "xen,linux-image\0xen,module"
>> +#define MODULE_INITRD_COMPATIBLE  "xen,linux-image\0xen,module"
>> +#define MODULE_XSM_COMPATIBLE  "xen,xsm-policy\0xen,module"
>> +#define MODULE_CUSTOM_COMPATIBLE  "xen,module" */
>> +#define MODULE_IMAGE_COMPATIBLE  "multiboot,kernel\0multiboot,module"
>> +#define MODULE_INITRD_COMPATIBLE  "multiboot,ramdisk\0multiboot,module"
>> +#define MODULE_XSM_COMPATIBLE  "xen,xsm-policy\0multiboot,module"
>> +#define MODULE_CUSTOM_COMPATIBLE  "multiboot,module"
>> +
>> +/* This maximum size is defined in Power.org ePAPR V1.1
>> + * https://www.power.org/documentation/epapr-version-1-1/
>> + * 2.2.1.1 Node Name Requirements
>> + * node-name@unit-address
>> + * 31 + 1(@) + 16(64bit address in hex format) + 1(\0) = 49
>> + */
>> +#define FDT_NODE_NAME_MAX_SIZE  (49)
>> +
>> +#define ARG_SHIFT(argc, argv) \
>> +  do { \
>> +    (argc)--; \
>> +    (argv)++; \
>> +  } while (0)
>> +
>> +struct compat_string_struct
>> +{
>> +  grub_size_t size;
>> +  const char *compat_string;
>> +};
>> +typedef struct compat_string_struct compat_string_struct_t;
>> +#define FDT_COMPATIBLE(x) {.size = sizeof(x), .compat_string = (x)}
>> +
>> +enum module_type
>> +{
>> +  MODULE_IMAGE,
>> +  MODULE_INITRD,
>> +  MODULE_XSM,
>> +  MODULE_CUSTOM
>> +};
>> +typedef enum module_type module_type_t;
>> +
>> +struct fdt_node_info
>> +{
>> +  module_type_t type;
>> +
>> +  const char *compat_string;
>> +  grub_size_t compat_string_size;
>> +};
>> +
>> +struct xen_hypervisor_header
>> +{
>> +  struct grub_arm64_linux_kernel_header efi_head;
>> +
>> +  /* This is always PE\0\0.  */
>> +  grub_uint8_t signature[GRUB_PE32_SIGNATURE_SIZE];
>> +  /* The COFF file header.  */
>> +  struct grub_pe32_coff_header coff_header;
>> +  /* The Optional header.  */
>> +  struct grub_pe64_optional_header optional_header;
>> +};
>> +
>> +struct xen_boot_binary
>> +{
>> +  struct xen_boot_binary *next;
>> +  struct xen_boot_binary **prev;
>> +  const char *name;
>> +
>> +  grub_addr_t start;
>> +  grub_size_t size;
>> +  grub_size_t align;
>> +
>> +  char *cmdline;
>> +  int cmdline_size;
>> +
>> +  struct fdt_node_info node_info;
>> +};
>> +
>> +static grub_dl_t my_mod;
>> +
>> +static struct xen_boot_binary *xen_hypervisor;
>> +static struct xen_boot_binary *module_head;
>> +static const grub_size_t module_default_align[] = {
>> +  MODULE_IMAGE_MIN_ALIGN,
>> +  MODULE_INITRD_MIN_ALIGN,
>> +  MODULE_XSM_MIN_ALIGN,
>> +  MODULE_CUSTOM_MIN_ALIGN
>> +};
>> +
>> +static void *xen_boot_fdt;
>> +static const compat_string_struct_t default_compat_string[] = {
>> +  FDT_COMPATIBLE (MODULE_IMAGE_COMPATIBLE),
>> +  FDT_COMPATIBLE (MODULE_INITRD_COMPATIBLE),
>> +  FDT_COMPATIBLE (MODULE_XSM_COMPATIBLE),
>> +  FDT_COMPATIBLE (MODULE_CUSTOM_COMPATIBLE)
>> +};
>> +
>> +static __inline grub_addr_t
>> +xen_boot_address_align (grub_addr_t start, grub_size_t align)
>> +{
>> +  return (align ? (ALIGN_UP (start, align)) : start);
>> +}
>> +
>> +/* Parse the option of xen_module command. For now, we support
>> +   (1) --type <the compatible stream>
>> +   We also set up the type of module in this function.
>> +   If there are some "--type" options in the command line,
>> +   we make a custom compatible stream in this function. */
>> +static grub_err_t
>> +set_module_type (grub_command_t cmd, struct xen_boot_binary *module,
>> +              int argc, char *argv[], int *file_name_index)
>> +{
>> +  char **compat_string_temp_array;
>> +  grub_size_t total_size = 0;
>> +  int num_types = 0, i;
>> +  char *temp = NULL;
>> +
>> +  *file_name_index = 0;
>> +
>> +  if (!grub_strcmp (cmd->name, "xen_linux"))
>> +    module->node_info.type = MODULE_IMAGE;
>> +  else if (!grub_strcmp (cmd->name, "xen_initrd"))
>> +    module->node_info.type = MODULE_INITRD;
>> +  else if (!grub_strcmp (cmd->name, "xen_xsm"))
>> +    module->node_info.type = MODULE_XSM;
>> +  else if (!grub_strcmp (cmd->name, "xen_module"))
>> +    module->node_info.type = MODULE_CUSTOM;
>> +
>> +  /* if there are some options we need to process. */
>> +  if (module->node_info.type == MODULE_CUSTOM)
>> +    {
>> +      compat_string_temp_array =
>> +     (char **) grub_zalloc (sizeof (char *) * argc);
>> +      if (!compat_string_temp_array)
>> +     return grub_errno;
>> +      /* the module type is set by "--type"(MODULE_CUSTOM) */
>> +      while (argc > 2 && !grub_strcmp (argv[0], "--type"))
>> +     {
>> +       module->node_info.type = MODULE_CUSTOM;
>> +       ARG_SHIFT (argc, argv);
>> +       total_size += grub_strlen (argv[0]) + 1;
>> +       compat_string_temp_array[num_types++] = argv[0];
>> +       ARG_SHIFT (argc, argv);
>> +       (*file_name_index) += 2;
>> +     }
>> +
>> +      if (total_size)
>> +     {
>> +       module->node_info.compat_string = temp =
>> +         (char *) grub_zalloc (total_size);
>> +       if (!temp)
>> +         {
>> +           grub_free (compat_string_temp_array);
>> +           return grub_errno;
>> +         }
>> +
>> +       module->node_info.compat_string_size = total_size;
>> +       for (i = 0; num_types > 0; num_types--, i++, temp++)
>> +         {
>> +           grub_strcpy (temp, compat_string_temp_array[i]);
>> +           temp += grub_strlen (compat_string_temp_array[i]);
>> +         }
>> +     }
>> +      else
>> +     {
>> +       module->node_info.compat_string =
>> +         default_compat_string[MODULE_CUSTOM].compat_string;
>> +       module->node_info.compat_string_size =
>> +         default_compat_string[MODULE_CUSTOM].size;
>> +     }
>> +
>> +      grub_free (compat_string_temp_array);
>> +    }
>> +
>> +  return GRUB_ERR_NONE;
>> +}
>> +
>> +static grub_err_t
>> +prepare_xen_hypervisor_params (void)
>> +{
>> +  int chosen_node = 0;
>> +  int retval;
>> +
>> +  xen_boot_fdt = grub_linux_get_fdt ();
>> +  if (!xen_boot_fdt)
>> +    return grub_error (GRUB_ERR_IO, "failed to get FDT");
>> +
>> +  chosen_node = grub_fdt_find_subnode (xen_boot_fdt, 0, "chosen");
>> +  if (chosen_node < 0)
>> +    chosen_node = grub_fdt_add_subnode (xen_boot_fdt, 0, "chosen");
>> +  if (chosen_node < 1)
>> +    return grub_error (GRUB_ERR_IO, "failed to get chosen node in FDT");
>> +
>> +  grub_dprintf ("xen_loader",
>> +             "Xen Hypervisor cmdline : %s @ %p size:%d\n",
>> +             xen_hypervisor->cmdline, xen_hypervisor->cmdline,
>> +             xen_hypervisor->cmdline_size);
>> +
>> +  retval = grub_fdt_set_prop (xen_boot_fdt, chosen_node, "bootargs",
>> +                           xen_hypervisor->cmdline,
>> +                           xen_hypervisor->cmdline_size);
>> +  if (retval)
>> +    return grub_error (GRUB_ERR_IO, "failed to install/update FDT");
>> +
>> +  return GRUB_ERR_NONE;
>> +}
>> +
>> +static grub_err_t
>> +prepare_xen_module_params (struct xen_boot_binary *module)
>> +{
>> +  int retval, chosen_node = 0, module_node = 0;
>> +  char module_name[FDT_NODE_NAME_MAX_SIZE];
>> +
>> +  retval = grub_snprintf (module_name, FDT_NODE_NAME_MAX_SIZE, "module@%lx",
>> +                       xen_boot_address_align (module->start,
>> +                                               module->align));
>> +  grub_dprintf ("xen_loader", "Module node name %s \n", module_name);
>> +
>> +  if (retval < (int) sizeof ("module@"))
>> +    return grub_error (GRUB_ERR_IO, N_("failed to get FDT"));
>> +
>> +  chosen_node = grub_fdt_find_subnode (xen_boot_fdt, 0, "chosen");
>> +  if (chosen_node < 0)
>> +    chosen_node = grub_fdt_add_subnode (xen_boot_fdt, 0, "chosen");
>> +  if (chosen_node < 1)
>> +    return grub_error (GRUB_ERR_IO, "failed to get chosen node in FDT");
>> +
>> +  module_node =
>> +    grub_fdt_find_subnode (xen_boot_fdt, chosen_node, module_name);
>> +  if (module_node < 0)
>> +    module_node =
>> +      grub_fdt_add_subnode (xen_boot_fdt, chosen_node, module_name);
>> +
>> +  retval = grub_fdt_set_prop (xen_boot_fdt, module_node, "compatible",
>> +                           module->node_info.compat_string,
>> +                           (grub_uint32_t) module->
>> +                           node_info.compat_string_size);
>> +  if (retval)
>> +    return grub_error (GRUB_ERR_IO, N_("failed to update FDT"));
>> +
>> +  grub_dprintf ("xen_loader", "Module %s compatible = %s size = 0x%lx\n",
>> +             module->name, module->node_info.compat_string,
>> +             module->node_info.compat_string_size);
>> +
>> +  retval = grub_fdt_set_reg64 (xen_boot_fdt, module_node,
>> +                            xen_boot_address_align (module->start,
>> +                                                    module->align),
>> +                            module->size);
>> +  if (retval)
>> +    return grub_error (GRUB_ERR_IO, N_("failed to update FDT"));
>> +
>> +  if (module->cmdline && module->cmdline_size > 0)
>> +    {
>> +      grub_dprintf ("xen_loader",
>> +                 "Module %s cmdline : %s @ %p size:%d\n", module->name,
>> +                 module->cmdline, module->cmdline, module->cmdline_size);
>> +
>> +      retval = grub_fdt_set_prop (xen_boot_fdt, module_node, "bootargs",
>> +                               module->cmdline, module->cmdline_size + 1);
>> +      if (retval)
>> +     return grub_error (GRUB_ERR_IO, "failed to update FDT");
>> +    }
>> +  else
>> +    {
>> +      grub_dprintf ("xen_loader", "Module %s has not bootargs!\n",
>> +                 module->name);
>> +    }
>> +
>> +  return GRUB_ERR_NONE;
>> +}
>> +
>> +static grub_err_t
>> +install_all_params (void)
>> +{
>> +  grub_efi_guid_t fdt_guid = GRUB_EFI_DEVICE_TREE_GUID;
>> +  grub_efi_boot_services_t *b;
>> +  grub_efi_status_t status;
>> +
>> +  b = grub_efi_system_table->boot_services;
>> +  status = b->install_configuration_table (&fdt_guid, xen_boot_fdt);
>> +  if (status != GRUB_EFI_SUCCESS)
>> +    return grub_error (GRUB_ERR_IO, "failed to install FDT");
>> +
>> +  grub_dprintf ("xen_loader",
>> +             "Installed/updated FDT configuration table @ %p\n",
>> +             xen_boot_fdt);
>> +
>> +  return GRUB_ERR_NONE;
>> +}
>> +
>> +static grub_err_t
>> +clean_all_params (void)
>> +{
>> +  if (xen_boot_fdt)
>> +    {
>> +      grub_efi_free_pages ((grub_efi_physical_address_t) xen_boot_fdt,
>> +                        BYTES_TO_PAGES (grub_fdt_get_totalsize
>> +                                        (xen_boot_fdt)));
>> +      xen_boot_fdt = NULL;
>> +    }
>> +
>> +  return GRUB_ERR_NONE;
>> +}
>> +
>> +static grub_err_t
>> +finalize_params_xen_boot (void)
>> +{
>> +  struct xen_boot_binary *module;
>> +
>> +  if (xen_hypervisor)
>> +    {
>> +      if (prepare_xen_hypervisor_params () != GRUB_ERR_NONE)
>> +     goto fail;
>> +    }
>> +  else
>> +    {
>> +      grub_dprintf ("xen_loader", "Failed to get Xen Hypervisor info!\n");
>> +      goto fail;
>> +    }
>> +
>> +  /* Set module params info */
>> +  FOR_LIST_ELEMENTS (module, module_head)
>> +  {
>> +    if (module->start && module->size > 0)
>> +      {
>> +     grub_dprintf ("xen_loader", "Module %s @ 0x%lx size:0x%lx\n",
>> +                   module->name,
>> +                   xen_boot_address_align (module->start, module->align),
>> +                   module->size);
>> +     if (prepare_xen_module_params (module) != GRUB_ERR_NONE)
>> +       goto fail;
>> +      }
>> +    else
>> +      {
>> +     grub_dprintf ("xen_loader", "Module info error: %s!\n", module->name);
>> +     goto fail;
>> +      }
>> +  }
>> +
>> +  if (install_all_params () == GRUB_ERR_NONE)
>> +    return GRUB_ERR_NONE;
>> +
>> +fail:
>> +  clean_all_params ();
>> +
>> +  return grub_error (GRUB_ERR_IO, "failed to install/update FDT");
>> +}
>> +
>> +
>> +static grub_err_t
>> +xen_boot (void)
>> +{
>> +  grub_err_t err = finalize_params_xen_boot ();
>> +  if (err)
>> +    return err;
>> +
>> +  return grub_arm64_uefi_boot_image (xen_hypervisor->start,
>> +                                  xen_hypervisor->size,
>> +                                  xen_hypervisor->cmdline);
>> +}
>> +
>> +static void
>> +single_binary_unload (struct xen_boot_binary *binary)
>> +{
>> +  if (!binary)
>> +    return;
>> +
>> +  if (binary->start && binary->size > 0)
>> +    {
>> +      grub_efi_free_pages ((grub_efi_physical_address_t) binary->start,
>> +                        BYTES_TO_PAGES (binary->size + binary->align));
>> +    }
>> +
>> +  if (binary->cmdline && binary->cmdline_size > 0)
>> +    {
>> +      grub_free (binary->cmdline);
>> +      grub_dprintf ("xen_loader",
>> +                 "Module %s cmdline memory free @ %p size: %d\n",
>> +                 binary->name, binary->cmdline, binary->cmdline_size);
>> +    }
>> +
>> +  if (binary->node_info.type == MODULE_CUSTOM)
>> +    grub_free ((void *) binary->node_info.compat_string);
>> +
>> +  if (grub_strcmp (binary->name, XEN_HYPERVISOR_NAME))
>> +    grub_list_remove (GRUB_AS_LIST (binary));
>> +
>> +  grub_dprintf ("xen_loader",
>> +             "Module %s struct memory free @ %p size: 0x%lx\n",
>> +             binary->name, binary, sizeof (binary));
>> +  grub_free (binary);
>> +
>> +  return;
>> +}
>> +
>> +static void
>> +all_binaries_unload (void)
>> +{
>> +  struct xen_boot_binary *binary;
>> +
>> +  FOR_LIST_ELEMENTS (binary, module_head)
>> +  {
>> +    single_binary_unload (binary);
>> +  }
>> +
>> +  if (xen_hypervisor)
>> +    single_binary_unload (xen_hypervisor);
>> +
>> +  return;
>> +}
>> +
>> +static grub_err_t
>> +xen_unload (void)
>> +{
>> +  grub_linux_set_loaded (0);
>> +  all_binaries_unload ();
>> +  clean_all_params ();
>> +  grub_dl_unref (my_mod);
>> +
>> +  return GRUB_ERR_NONE;
>> +}
>> +
>> +static void
>> +xen_boot_binary_load (struct xen_boot_binary *binary, grub_file_t file,
>> +                   int argc, char *argv[])
>> +{
>> +  binary->size = grub_file_size (file);
>> +  grub_dprintf ("xen_loader", "Xen_boot %s file size: 0x%lx\n",
>> +             binary->name, binary->size);
>> +
>> +  binary->start = (grub_addr_t) grub_efi_allocate_pages (0,
>> +                                                      (BYTES_TO_PAGES
>> +                                                       (binary->size +
>> +                                                        binary->align)));
>> +  if (!binary->start)
>> +    {
>> +      grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
>> +      return;
>> +    }
>> +
>> +  grub_dprintf ("xen_loader", "Xen_boot %s numpages: 0x%lx\n",
>> +             binary->name, BYTES_TO_PAGES (binary->size + binary->align));
>> +
>> +  if (grub_file_read (file, (void *) xen_boot_address_align (binary->start,
>> +                                                          binary->align),
>> +                   binary->size) != (grub_ssize_t) binary->size)
>> +    {
>> +      single_binary_unload (binary);
>> +      grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), argv[0]);
>> +      return;
>> +    }
>> +
>> +  if (argc > 1)
>> +    {
>> +      binary->cmdline_size = grub_loader_cmdline_size (argc - 1, argv + 1);
>> +      binary->cmdline = grub_zalloc (binary->cmdline_size);
>> +      if (!binary->cmdline)
>> +     {
>> +       single_binary_unload (binary);
>> +       grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
>> +       return;
>> +     }
>> +      grub_create_loader_cmdline (argc - 1, argv + 1, binary->cmdline,
>> +                               binary->cmdline_size);
>> +      grub_dprintf ("xen_loader",
>> +                 "Xen_boot %s cmdline @ %p %s, size: %d\n", binary->name,
>> +                 binary->cmdline, binary->cmdline, binary->cmdline_size);
>> +    }
>> +  else
>> +    {
>> +      binary->cmdline_size = 0;
>> +      binary->cmdline = NULL;
>> +    }
>> +
>> +  grub_errno = GRUB_ERR_NONE;
>> +  return;
>> +}
>> +
>> +static grub_err_t
>> +grub_cmd_xen_module (grub_command_t cmd, int argc, char *argv[])
>> +{
>> +
>> +  struct xen_boot_binary *module = NULL;
>> +  int file_name_index = 0;
>> +  grub_file_t file = 0;
>> +
>> +  if (!argc)
>> +    {
>> +      grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
>> +      goto fail;
>> +    }
>> +
>> +  if (!grub_linux_get_loaded ())
>> +    {
>> +      grub_error (GRUB_ERR_BAD_ARGUMENT,
>> +               N_("you need to load the Xen Hypervisor first"));
>> +      goto fail;
>> +    }
>> +
>> +  module =
>> +    (struct xen_boot_binary *) grub_zalloc (sizeof (struct 
>> xen_boot_binary));
>> +  if (!module)
>> +    return grub_errno;
>> +
>> +  /* process all the options and get module type */
>> +  if (set_module_type (cmd, module, argc, argv, &file_name_index) !=
>> +      GRUB_ERR_NONE)
>> +    goto fail;
>> +  switch (module->node_info.type)
>> +    {
>> +    case MODULE_IMAGE:
>> +    case MODULE_INITRD:
>> +    case MODULE_XSM:
>> +      module->node_info.compat_string =
>> +     default_compat_string[module->node_info.type].compat_string;
>> +      module->node_info.compat_string_size =
>> +     default_compat_string[module->node_info.type].size;
>> +      break;
>> +
>> +    case MODULE_CUSTOM:
>> +      /* we have set the node_info in set_module_type */
>> +      break;
>> +
>> +    default:
>> +      return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("invalid argument"));
>> +    }
>> +  module->name = module->node_info.compat_string;
>> +  module->align = module_default_align[module->node_info.type];
>> +
>> +  grub_dprintf ("xen_loader", "Init %s module and node info:\n"
>> +             "compatible %s\ncompat_string_size 0x%lx\n",
>> +             module->name, module->node_info.compat_string,
>> +             module->node_info.compat_string_size);
>> +
>> +  file = grub_file_open (argv[file_name_index]);
>> +  if (!file)
>> +    goto fail;
>> +
>> +  xen_boot_binary_load (module, file, argc - file_name_index,
>> +                     argv + file_name_index);
>> +  if (grub_errno == GRUB_ERR_NONE)
>> +    grub_list_push (GRUB_AS_LIST_P (&module_head), GRUB_AS_LIST (module));
>> +
>> +fail:
>> +  if (file)
>> +    grub_file_close (file);
>> +  if (grub_errno != GRUB_ERR_NONE)
>> +    single_binary_unload (module);
>> +
>> +  return grub_errno;
>> +}
>> +
>> +static grub_err_t
>> +grub_cmd_xen_hypervisor (grub_command_t cmd __attribute__ ((unused)),
>> +                      int argc, char *argv[])
>> +{
>> +  struct xen_hypervisor_header sh;
>> +  grub_file_t file = NULL;
>> +
>> +  grub_dl_ref (my_mod);
>> +
>> +  if (!argc)
>> +    {
>> +      grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
>> +      goto fail;
>> +    }
>> +
>> +  file = grub_file_open (argv[0]);
>> +  if (!file)
>> +    goto fail;
>> +
>> +  if (grub_file_read (file, &sh, sizeof (sh)) != (long) sizeof (sh))
>> +    goto fail;
>> +  if (grub_arm64_uefi_check_image
>> +      ((struct grub_arm64_linux_kernel_header *) &sh) != GRUB_ERR_NONE)
>> +    goto fail;
>> +  grub_file_seek (file, 0);
>> +
>> +  /* if another module has called grub_loader_set,
>> +     we need to make sure that another module is unloaded properly */
>> +  grub_loader_unset ();
>> +
>> +  xen_hypervisor =
>> +    (struct xen_boot_binary *) grub_zalloc (sizeof (struct 
>> xen_boot_binary));
>> +  if (!xen_hypervisor)
>> +    return grub_errno;
>> +
>> +  xen_hypervisor->name = XEN_HYPERVISOR_NAME;
>> +  xen_hypervisor->align = (grub_size_t) 
>> sh.optional_header.section_alignment;
>> +
>> +  xen_boot_binary_load (xen_hypervisor, file, argc, argv);
>> +  if (grub_errno == GRUB_ERR_NONE)
>> +    {
>> +      grub_loader_set (xen_boot, xen_unload, 0);
>> +      grub_linux_set_loaded (1);
>> +    }
>> +
>> +fail:
>> +  if (file)
>> +    grub_file_close (file);
>> +  if (grub_errno != GRUB_ERR_NONE)
>> +    {
>> +      grub_linux_set_loaded (0);
>> +      all_binaries_unload ();
>> +      grub_dl_unref (my_mod);
>> +    }
>> +
>> +  return grub_errno;
>> +}
>> +
>> +static grub_command_t cmd_xen_hypervisor, cmd_xen_module;
>> +static grub_command_t cmd_xen_linux, cmd_xen_initrd, cmd_xen_xsm;
>> +
>> +GRUB_MOD_INIT (xen_boot)
>> +{
>> +  cmd_xen_hypervisor =
>> +    grub_register_command ("xen_hypervisor", grub_cmd_xen_hypervisor, 0,
>> +                        N_("Load a xen hypervisor."));
>> +  cmd_xen_linux =
>> +    grub_register_command ("xen_linux", grub_cmd_xen_module, 0,
>> +                        N_("Load a xen linux kernel for dom0."));
>> +  cmd_xen_initrd =
>> +    grub_register_command ("xen_initrd", grub_cmd_xen_module, 0,
>> +                        N_("Load a xen initrd for dom0."));
>> +  cmd_xen_xsm =
>> +    grub_register_command ("xen_xsm", grub_cmd_xen_module, 0,
>> +                        N_("Load a xen security module."));
>> +  cmd_xen_module =
>> +    grub_register_command ("xen_module", grub_cmd_xen_module, 0,
>> +                        N_("Load a xen module."));
>> +  my_mod = mod;
>> +}
>> +
>> +GRUB_MOD_FINI (xen_boot)
>> +{
>> +  grub_unregister_command (cmd_xen_hypervisor);
>> +  grub_unregister_command (cmd_xen_linux);
>> +  grub_unregister_command (cmd_xen_initrd);
>> +  grub_unregister_command (cmd_xen_xsm);
>> +  grub_unregister_command (cmd_xen_module);
>> +}
>>
>
>



-- 
Best regards,

Fu Wei
Software Engineer
Red Hat Software (Beijing) Co.,Ltd.Shanghai Branch
Ph: +86 21 61221326(direct)
Ph: +86 186 2020 4684 (mobile)
Room 1512, Regus One Corporate Avenue,Level 15,
One Corporate Avenue,222 Hubin Road,Huangpu District,
Shanghai,China 200021

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