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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008,2009 Free Software Foundation, Inc.
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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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* 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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* 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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#include <grub/memory.h>
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#ifdef GRUB_MACHINE_PCBIOS
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#include <grub/machine/biosnum.h>
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#include <grub/machine/apm.h>
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#include <grub/machine/memory.h>
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#include <grub/multiboot.h>
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#include <grub/cpu/relocator.h>
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#include <grub/disk.h>
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#include <grub/device.h>
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#include <grub/partition.h>
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#include <grub/misc.h>
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#include <grub/relocator.h>
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#include <grub/video.h>
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#include <grub/file.h>
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/* The bits in the required part of flags field we don't support. */
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#define UNSUPPORTED_FLAGS 0x0000fff8
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struct module *modules, *modules_last;
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static grub_size_t cmdline_size;
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static grub_size_t total_modcmd;
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static unsigned modcnt;
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static char *cmdline = NULL;
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static grub_uint32_t bootdev;
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static int bootdev_set;
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static grub_size_t elf_sec_num, elf_sec_entsize;
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static unsigned elf_sec_shstrndx;
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static void *elf_sections;
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grub_multiboot_load (grub_file_t file)
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struct multiboot_header *header;
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buffer = grub_malloc (MULTIBOOT_SEARCH);
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len = grub_file_read (file, buffer, MULTIBOOT_SEARCH);
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return grub_error (GRUB_ERR_BAD_OS, "file too small");
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/* Look for the multiboot header in the buffer. The header should
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be at least 12 bytes and aligned on a 4-byte boundary. */
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for (header = (struct multiboot_header *) buffer;
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((char *) header <= buffer + len - 12) || (header = 0);
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header = (struct multiboot_header *) ((char *) header + MULTIBOOT_HEADER_ALIGN))
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if (header->magic == MULTIBOOT_HEADER_MAGIC
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&& !(header->magic + header->flags + header->checksum))
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "no multiboot header found");
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if (header->flags & UNSUPPORTED_FLAGS)
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return grub_error (GRUB_ERR_UNKNOWN_OS,
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"unsupported flag: 0x%x", header->flags);
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if (header->flags & MULTIBOOT_AOUT_KLUDGE)
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int offset = ((char *) header - buffer -
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(header->header_addr - header->load_addr));
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int load_size = ((header->load_end_addr == 0) ? file->size - offset :
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header->load_end_addr - header->load_addr);
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grub_size_t code_size;
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grub_relocator_chunk_t ch;
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if (header->bss_end_addr)
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code_size = (header->bss_end_addr - header->load_addr);
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code_size = load_size;
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err = grub_relocator_alloc_chunk_addr (grub_multiboot_relocator,
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&ch, header->load_addr,
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grub_dprintf ("multiboot_loader", "Error loading aout kludge\n");
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source = get_virtual_current_address (ch);
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if ((grub_file_seek (file, offset)) == (grub_off_t) -1)
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grub_file_read (file, source, load_size);
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if (header->bss_end_addr)
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grub_memset ((grub_uint32_t *) source + load_size, 0,
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header->bss_end_addr - header->load_addr - load_size);
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grub_multiboot_payload_eip = header->entry_addr;
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err = grub_multiboot_load_elf (file, buffer);
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if (header->flags & MULTIBOOT_VIDEO_MODE)
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switch (header->mode_type)
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err = grub_multiboot_set_console (GRUB_MULTIBOOT_CONSOLE_EGA_TEXT,
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GRUB_MULTIBOOT_CONSOLE_EGA_TEXT
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| GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER,
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err = grub_multiboot_set_console (GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER,
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GRUB_MULTIBOOT_CONSOLE_EGA_TEXT
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| GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER,
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header->width, header->height,
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err = grub_error (GRUB_ERR_BAD_OS,
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"unsupported graphical mode type %d",
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err = grub_multiboot_set_console (GRUB_MULTIBOOT_CONSOLE_EGA_TEXT,
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GRUB_MULTIBOOT_CONSOLE_EGA_TEXT,
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#if GRUB_MACHINE_HAS_VBE || GRUB_MACHINE_HAS_VGA_TEXT
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#include <grub/i386/pc/vbe.h>
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grub_multiboot_get_mbi_size (void)
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return sizeof (struct multiboot_info) + ALIGN_UP (cmdline_size, 4)
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+ modcnt * sizeof (struct multiboot_mod_list) + total_modcmd
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+ ALIGN_UP (sizeof(PACKAGE_STRING), 4)
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+ grub_get_multiboot_mmap_count () * sizeof (struct multiboot_mmap_entry)
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+ elf_sec_entsize * elf_sec_num
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+ 256 * sizeof (struct multiboot_color)
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#if GRUB_MACHINE_HAS_VBE || GRUB_MACHINE_HAS_VGA_TEXT
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+ sizeof (struct grub_vbe_info_block)
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+ sizeof (struct grub_vbe_mode_info_block)
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+ ALIGN_UP (sizeof (struct multiboot_apm_info), 4);
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/* Fill previously allocated Multiboot mmap. */
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grub_fill_multiboot_mmap (struct multiboot_mmap_entry *first_entry)
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struct multiboot_mmap_entry *mmap_entry = (struct multiboot_mmap_entry *) first_entry;
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auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t,
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int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size,
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grub_memory_type_t type)
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mmap_entry->addr = addr;
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mmap_entry->len = size;
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case GRUB_MEMORY_AVAILABLE:
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mmap_entry->type = MULTIBOOT_MEMORY_AVAILABLE;
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case GRUB_MEMORY_ACPI:
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mmap_entry->type = MULTIBOOT_MEMORY_ACPI_RECLAIMABLE;
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case GRUB_MEMORY_NVS:
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mmap_entry->type = MULTIBOOT_MEMORY_NVS;
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case GRUB_MEMORY_BADRAM:
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mmap_entry->type = MULTIBOOT_MEMORY_BADRAM;
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mmap_entry->type = MULTIBOOT_MEMORY_RESERVED;
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mmap_entry->size = sizeof (struct multiboot_mmap_entry) - sizeof (mmap_entry->size);
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grub_mmap_iterate (hook);
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#if GRUB_MACHINE_HAS_VBE || GRUB_MACHINE_HAS_VGA_TEXT
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fill_vbe_info (struct multiboot_info *mbi, grub_uint8_t *ptrorig,
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grub_uint32_t ptrdest, int fill_generic)
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grub_uint32_t vbe_mode;
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struct grub_vbe_mode_info_block *mode_info;
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#if GRUB_MACHINE_HAS_VBE
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grub_vbe_status_t status;
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void *scratch = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
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status = grub_vbe_bios_get_controller_info (scratch);
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if (status != GRUB_VBE_STATUS_OK)
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return grub_error (GRUB_ERR_IO, "Can't get controller info.");
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mbi->vbe_control_info = ptrdest;
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grub_memcpy (ptrorig, scratch, sizeof (struct grub_vbe_info_block));
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ptrorig += sizeof (struct grub_vbe_info_block);
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ptrdest += sizeof (struct grub_vbe_info_block);
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mbi->vbe_control_info = 0;
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#if GRUB_MACHINE_HAS_VBE
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status = grub_vbe_bios_get_mode (scratch);
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vbe_mode = *(grub_uint32_t *) scratch;
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if (status != GRUB_VBE_STATUS_OK)
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return grub_error (GRUB_ERR_IO, "can't get VBE mode");
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mbi->vbe_mode = vbe_mode;
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mode_info = (struct grub_vbe_mode_info_block *) ptrorig;
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mbi->vbe_mode_info = ptrdest;
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/* get_mode_info isn't available for mode 3. */
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grub_memset (mode_info, 0, sizeof (struct grub_vbe_mode_info_block));
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mode_info->memory_model = GRUB_VBE_MEMORY_MODEL_TEXT;
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mode_info->x_resolution = 80;
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mode_info->y_resolution = 25;
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#if GRUB_MACHINE_HAS_VBE
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status = grub_vbe_bios_get_mode_info (vbe_mode, scratch);
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if (status != GRUB_VBE_STATUS_OK)
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return grub_error (GRUB_ERR_IO, "can't get mode info");
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grub_memcpy (mode_info, scratch,
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sizeof (struct grub_vbe_mode_info_block));
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ptrorig += sizeof (struct grub_vbe_mode_info_block);
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ptrdest += sizeof (struct grub_vbe_mode_info_block);
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#if GRUB_MACHINE_HAS_VBE
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grub_vbe_bios_get_pm_interface (&mbi->vbe_interface_seg,
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&mbi->vbe_interface_off,
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&mbi->vbe_interface_len);
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mbi->flags |= MULTIBOOT_INFO_VBE_INFO;
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if (fill_generic && mode_info->memory_model == GRUB_VBE_MEMORY_MODEL_TEXT)
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mbi->framebuffer_addr = 0xb8000;
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mbi->framebuffer_pitch = 2 * mode_info->x_resolution;
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mbi->framebuffer_width = mode_info->x_resolution;
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mbi->framebuffer_height = mode_info->y_resolution;
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mbi->framebuffer_bpp = 16;
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mbi->framebuffer_type = MULTIBOOT_FRAMEBUFFER_TYPE_EGA_TEXT;
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mbi->flags |= MULTIBOOT_INFO_FRAMEBUFFER_INFO;
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return GRUB_ERR_NONE;
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retrieve_video_parameters (struct multiboot_info *mbi,
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grub_uint8_t *ptrorig, grub_uint32_t ptrdest)
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struct grub_video_mode_info mode_info;
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grub_video_driver_id_t driv_id;
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struct grub_video_palette_data palette[256];
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err = grub_multiboot_set_video_mode ();
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grub_errno = GRUB_ERR_NONE;
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grub_video_get_palette (0, ARRAY_SIZE (palette), palette);
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driv_id = grub_video_get_driver_id ();
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#if GRUB_MACHINE_HAS_VGA_TEXT
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if (driv_id == GRUB_VIDEO_DRIVER_NONE)
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return fill_vbe_info (mbi, ptrorig, ptrdest, 1);
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if (driv_id == GRUB_VIDEO_DRIVER_NONE)
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return GRUB_ERR_NONE;
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err = grub_video_get_info_and_fini (&mode_info, &framebuffer);
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mbi->framebuffer_addr = (grub_addr_t) framebuffer;
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mbi->framebuffer_pitch = mode_info.pitch;
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mbi->framebuffer_width = mode_info.width;
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mbi->framebuffer_height = mode_info.height;
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mbi->framebuffer_bpp = mode_info.bpp;
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if (mode_info.mode_type & GRUB_VIDEO_MODE_TYPE_INDEX_COLOR)
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struct multiboot_color *mb_palette;
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mbi->framebuffer_type = MULTIBOOT_FRAMEBUFFER_TYPE_INDEXED;
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mbi->framebuffer_palette_addr = ptrdest;
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mbi->framebuffer_palette_num_colors = mode_info.number_of_colors;
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if (mbi->framebuffer_palette_num_colors > ARRAY_SIZE (palette))
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mbi->framebuffer_palette_num_colors = ARRAY_SIZE (palette);
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mb_palette = (struct multiboot_color *) ptrorig;
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for (i = 0; i < mbi->framebuffer_palette_num_colors; i++)
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mb_palette[i].red = palette[i].r;
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mb_palette[i].green = palette[i].g;
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mb_palette[i].blue = palette[i].b;
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ptrorig += mbi->framebuffer_palette_num_colors
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* sizeof (struct multiboot_color);
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ptrdest += mbi->framebuffer_palette_num_colors
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* sizeof (struct multiboot_color);
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mbi->framebuffer_type = MULTIBOOT_FRAMEBUFFER_TYPE_RGB;
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mbi->framebuffer_red_field_position = mode_info.red_field_pos;
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mbi->framebuffer_red_mask_size = mode_info.red_mask_size;
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mbi->framebuffer_green_field_position = mode_info.green_field_pos;
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mbi->framebuffer_green_mask_size = mode_info.green_mask_size;
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mbi->framebuffer_blue_field_position = mode_info.blue_field_pos;
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mbi->framebuffer_blue_mask_size = mode_info.blue_mask_size;
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mbi->flags |= MULTIBOOT_INFO_FRAMEBUFFER_INFO;
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#if GRUB_MACHINE_HAS_VBE
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if (driv_id == GRUB_VIDEO_DRIVER_VBE)
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return fill_vbe_info (mbi, ptrorig, ptrdest, 0);
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return GRUB_ERR_NONE;
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grub_multiboot_make_mbi (grub_uint32_t *target)
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struct multiboot_info *mbi;
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struct multiboot_mod_list *modlist;
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grub_size_t mmap_size;
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grub_uint8_t *ptrorig;
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grub_relocator_chunk_t ch;
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bufsize = grub_multiboot_get_mbi_size ();
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err = grub_relocator_alloc_chunk_align (grub_multiboot_relocator, &ch,
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0, 0xffffffff - bufsize,
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GRUB_RELOCATOR_PREFERENCE_NONE);
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ptrorig = get_virtual_current_address (ch);
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ptrdest = (grub_addr_t) get_virtual_current_address (ch);
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mbi = (struct multiboot_info *) ptrorig;
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ptrorig += sizeof (*mbi);
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ptrdest += sizeof (*mbi);
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grub_memset (mbi, 0, sizeof (*mbi));
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grub_memcpy (ptrorig, cmdline, cmdline_size);
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mbi->flags |= MULTIBOOT_INFO_CMDLINE;
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mbi->cmdline = ptrdest;
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ptrorig += ALIGN_UP (cmdline_size, 4);
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ptrdest += ALIGN_UP (cmdline_size, 4);
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grub_memcpy (ptrorig, PACKAGE_STRING, sizeof(PACKAGE_STRING));
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mbi->flags |= MULTIBOOT_INFO_BOOT_LOADER_NAME;
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mbi->boot_loader_name = ptrdest;
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ptrorig += ALIGN_UP (sizeof(PACKAGE_STRING), 4);
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ptrdest += ALIGN_UP (sizeof(PACKAGE_STRING), 4);
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#ifdef GRUB_MACHINE_PCBIOS
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struct grub_apm_info info;
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if (grub_apm_get_info (&info))
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struct multiboot_apm_info *mbinfo = (void *) ptrorig;
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mbinfo->cseg = info.cseg;
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mbinfo->offset = info.offset;
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mbinfo->cseg_16 = info.cseg_16;
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mbinfo->dseg = info.dseg;
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mbinfo->flags = info.flags;
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mbinfo->cseg_len = info.cseg_len;
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mbinfo->dseg_len = info.dseg_len;
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mbinfo->cseg_16_len = info.cseg_16_len;
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mbinfo->version = info.version;
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ptrorig += ALIGN_UP (sizeof (struct multiboot_apm_info), 4);
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ptrdest += ALIGN_UP (sizeof (struct multiboot_apm_info), 4);
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mbi->flags |= MULTIBOOT_INFO_MODS;
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mbi->mods_addr = ptrdest;
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mbi->mods_count = modcnt;
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modlist = (struct multiboot_mod_list *) ptrorig;
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ptrorig += modcnt * sizeof (struct multiboot_mod_list);
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ptrdest += modcnt * sizeof (struct multiboot_mod_list);
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for (i = 0, cur = modules; i < modcnt; i++, cur = cur->next)
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modlist[i].mod_start = cur->start;
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modlist[i].mod_end = modlist[i].mod_start + cur->size;
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modlist[i].cmdline = ptrdest;
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grub_memcpy (ptrorig, cur->cmdline, cur->cmdline_size);
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ptrorig += ALIGN_UP (cur->cmdline_size, 4);
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ptrdest += ALIGN_UP (cur->cmdline_size, 4);
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mmap_size = grub_get_multiboot_mmap_count ()
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* sizeof (struct multiboot_mmap_entry);
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grub_fill_multiboot_mmap ((struct multiboot_mmap_entry *) ptrorig);
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mbi->mmap_length = mmap_size;
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mbi->mmap_addr = ptrdest;
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mbi->flags |= MULTIBOOT_INFO_MEM_MAP;
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ptrorig += mmap_size;
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ptrdest += mmap_size;
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/* Convert from bytes to kilobytes. */
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mbi->mem_lower = grub_mmap_get_lower () / 1024;
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mbi->mem_upper = grub_mmap_get_upper () / 1024;
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mbi->flags |= MULTIBOOT_INFO_MEMORY;
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mbi->boot_device = bootdev;
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mbi->flags |= MULTIBOOT_INFO_BOOTDEV;
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mbi->u.elf_sec.addr = ptrdest;
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grub_memcpy (ptrorig, elf_sections, elf_sec_entsize * elf_sec_num);
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mbi->u.elf_sec.num = elf_sec_num;
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mbi->u.elf_sec.size = elf_sec_entsize;
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mbi->u.elf_sec.shndx = elf_sec_shstrndx;
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mbi->flags |= MULTIBOOT_INFO_ELF_SHDR;
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err = retrieve_video_parameters (mbi, ptrorig, ptrdest);
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grub_errno = GRUB_ERR_NONE;
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#if GRUB_MACHINE_HAS_VBE
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ptrorig += sizeof (struct grub_vbe_info_block);
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ptrdest += sizeof (struct grub_vbe_info_block);
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ptrorig += sizeof (struct grub_vbe_mode_info_block);
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ptrdest += sizeof (struct grub_vbe_mode_info_block);
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return GRUB_ERR_NONE;
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grub_multiboot_add_elfsyms (grub_size_t num, grub_size_t entsize,
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unsigned shndx, void *data)
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elf_sec_shstrndx = shndx;
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elf_sec_entsize = entsize;
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grub_multiboot_free_mbi (void)
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struct module *cur, *next;
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for (cur = modules; cur; cur = next)
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grub_free (cur->cmdline);
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grub_free (elf_sections);
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grub_multiboot_init_mbi (int argc, char *argv[])
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grub_ssize_t len = 0;
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grub_multiboot_free_mbi ();
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for (i = 0; i < argc; i++)
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len += grub_strlen (argv[i]) + 1;
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cmdline = p = grub_malloc (len);
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for (i = 0; i < argc; i++)
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p = grub_stpcpy (p, argv[i]);
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/* Remove the space after the last word. */
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return GRUB_ERR_NONE;
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grub_multiboot_add_module (grub_addr_t start, grub_size_t size,
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int argc, char *argv[])
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struct module *newmod;
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grub_ssize_t len = 0;
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newmod = grub_malloc (sizeof (*newmod));
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newmod->start = start;
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for (i = 0; i < argc; i++)
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len += grub_strlen (argv[i]) + 1;
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newmod->cmdline = p = grub_malloc (len);
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if (! newmod->cmdline)
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newmod->cmdline_size = len;
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total_modcmd += ALIGN_UP (len, 4);
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for (i = 0; i < argc; i++)
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p = grub_stpcpy (p, argv[i]);
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/* Remove the space after the last word. */
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if (p != newmod->cmdline)
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modules_last->next = newmod;
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modules_last->next = NULL;
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modules_last = newmod;
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return GRUB_ERR_NONE;
686
grub_multiboot_set_bootdev (void)
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grub_uint32_t biosdev, slice = ~0, part = ~0;
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#ifdef GRUB_MACHINE_PCBIOS
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biosdev = grub_get_root_biosnumber ();
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biosdev = 0xffffffff;
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if (biosdev == 0xffffffff)
700
dev = grub_device_open (0);
701
if (dev && dev->disk && dev->disk->partition)
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if (dev->disk->partition->parent)
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part = dev->disk->partition->number;
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slice = dev->disk->partition->parent->number;
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slice = dev->disk->partition->number;
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grub_device_close (dev);
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bootdev = ((biosdev & 0xff) << 24) | ((slice & 0xff) << 16)
715
| ((part & 0xff) << 8) | 0xff;