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/* pxe.c - Driver to provide access to the pxe filesystem */
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008 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/disk.h>
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#include <grub/file.h>
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#include <grub/misc.h>
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#include <grub/bufio.h>
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#include <grub/machine/pxe.h>
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#include <grub/machine/memory.h>
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#define SEGMENT(x) ((x) >> 4)
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#define OFFSET(x) ((x) & 0xF)
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#define SEGOFS(x) ((SEGMENT(x) << 16) + OFFSET(x))
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#define LINEAR(x) (void *) (((x >> 16) <<4) + (x & 0xFFFF))
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struct grub_pxenv *grub_pxe_pxenv;
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grub_uint32_t grub_pxe_your_ip;
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grub_uint32_t grub_pxe_server_ip;
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grub_uint32_t grub_pxe_gateway_ip;
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int grub_pxe_blksize = GRUB_PXE_MIN_BLKSIZE;
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static grub_file_t curr_file = 0;
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grub_uint32_t packet_number;
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grub_uint32_t block_size;
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grub_pxe_iterate (int (*hook) (const char *name))
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grub_pxe_open (const char *name, grub_disk_t disk)
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if (grub_strcmp (name, "pxe"))
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return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "not a pxe disk");
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disk->total_sectors = 0;
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disk->id = (unsigned long) "pxe";
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disk->has_partitions = 0;
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grub_pxe_close (grub_disk_t disk __attribute((unused)))
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grub_pxe_read (grub_disk_t disk __attribute((unused)),
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grub_disk_addr_t sector __attribute((unused)),
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grub_size_t size __attribute((unused)),
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char *buf __attribute((unused)))
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return GRUB_ERR_OUT_OF_RANGE;
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grub_pxe_write (grub_disk_t disk __attribute((unused)),
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grub_disk_addr_t sector __attribute((unused)),
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grub_size_t size __attribute((unused)),
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const char *buf __attribute((unused)))
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return GRUB_ERR_OUT_OF_RANGE;
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static struct grub_disk_dev grub_pxe_dev =
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.id = GRUB_DISK_DEVICE_PXE_ID,
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.iterate = grub_pxe_iterate,
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.open = grub_pxe_open,
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.close = grub_pxe_close,
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.read = grub_pxe_read,
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.write = grub_pxe_write,
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grub_pxefs_dir (grub_device_t device UNUSED, const char *path UNUSED,
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int (*hook) (const char *filename,
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const struct grub_dirhook_info *info) UNUSED)
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return GRUB_ERR_NONE;
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grub_pxefs_open (struct grub_file *file, const char *name)
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struct grub_pxenv_tftp_get_fsize c1;
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struct grub_pxenv_tftp_open c2;
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struct grub_pxe_data *data;
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grub_file_t file_int, bufio;
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grub_pxe_call (GRUB_PXENV_TFTP_CLOSE, &c.c2);
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c.c1.server_ip = grub_pxe_server_ip;
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c.c1.gateway_ip = grub_pxe_gateway_ip;
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grub_strcpy ((char *)&c.c1.filename[0], name);
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grub_pxe_call (GRUB_PXENV_TFTP_GET_FSIZE, &c.c1);
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return grub_error (GRUB_ERR_FILE_NOT_FOUND, "file not found");
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file->size = c.c1.file_size;
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c.c2.tftp_port = grub_cpu_to_be16 (GRUB_PXE_TFTP_PORT);
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c.c2.packet_size = grub_pxe_blksize;
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grub_pxe_call (GRUB_PXENV_TFTP_OPEN, &c.c2);
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return grub_error (GRUB_ERR_BAD_FS, "open fails");
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data = grub_malloc (sizeof (struct grub_pxe_data) + grub_strlen (name) + 1);
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data->packet_number = 0;
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data->block_size = grub_pxe_blksize;
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grub_strcpy (data->filename, name);
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file_int = grub_malloc (sizeof (*file_int));
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grub_memcpy (file_int, file, sizeof (struct grub_file));
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curr_file = file_int;
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bufio = grub_bufio_open (file_int, data->block_size);
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grub_free (file_int);
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grub_memcpy (file, bufio, sizeof (struct grub_file));
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return GRUB_ERR_NONE;
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grub_pxefs_read (grub_file_t file, char *buf, grub_size_t len)
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struct grub_pxenv_tftp_read c;
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struct grub_pxe_data *data;
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pn = grub_divmod64 (file->offset, data->block_size, &r);
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grub_error (GRUB_ERR_BAD_FS,
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"read access must be aligned to packet size");
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if ((curr_file != file) || (data->packet_number > pn))
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struct grub_pxenv_tftp_open o;
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grub_pxe_call (GRUB_PXENV_TFTP_CLOSE, &o);
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o.server_ip = grub_pxe_server_ip;
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o.gateway_ip = grub_pxe_gateway_ip;
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grub_strcpy ((char *)&o.filename[0], data->filename);
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o.tftp_port = grub_cpu_to_be16 (GRUB_PXE_TFTP_PORT);
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o.packet_size = data->block_size;
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grub_pxe_call (GRUB_PXENV_TFTP_OPEN, &o);
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grub_error (GRUB_ERR_BAD_FS, "open fails");
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data->packet_number = 0;
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c.buffer = SEGOFS (GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
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while (pn >= data->packet_number)
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c.buffer_size = grub_pxe_blksize;
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grub_pxe_call (GRUB_PXENV_TFTP_READ, &c);
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grub_error (GRUB_ERR_BAD_FS, "read fails");
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data->packet_number++;
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grub_memcpy (buf, (char *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR, len);
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grub_pxefs_close (grub_file_t file)
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struct grub_pxenv_tftp_close c;
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if (curr_file == file)
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grub_pxe_call (GRUB_PXENV_TFTP_CLOSE, &c);
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grub_free (file->data);
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return GRUB_ERR_NONE;
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grub_pxefs_label (grub_device_t device __attribute ((unused)),
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char **label __attribute ((unused)))
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return GRUB_ERR_NONE;
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static struct grub_fs grub_pxefs_fs =
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.dir = grub_pxefs_dir,
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.open = grub_pxefs_open,
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.read = grub_pxefs_read,
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.close = grub_pxefs_close,
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.label = grub_pxefs_label,
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grub_pxe_detect (void)
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struct grub_pxenv *pxenv;
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struct grub_pxenv_get_cached_info ci;
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struct grub_pxenv_boot_player *bp;
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pxenv = grub_pxe_scan ();
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ci.packet_type = GRUB_PXENV_PACKET_TYPE_DHCP_ACK;
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grub_pxe_call (GRUB_PXENV_GET_CACHED_INFO, &ci);
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bp = LINEAR (ci.buffer);
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grub_pxe_your_ip = bp->your_ip;
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grub_pxe_server_ip = bp->server_ip;
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grub_pxe_gateway_ip = bp->gateway_ip;
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grub_pxe_pxenv = pxenv;
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grub_pxe_unload (void)
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grub_fs_unregister (&grub_pxefs_fs);
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grub_disk_dev_unregister (&grub_pxe_dev);
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grub_disk_dev_register (&grub_pxe_dev);
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grub_fs_register (&grub_pxefs_fs);