2009-12-19  Vladimir Serbinenko  <phcoder@gmail.com>

	Support for (pxe[:server[:gateway]]) syntax and
	use environment variable for PXE.

	* commands/i386/pc/pxecmd.c (options): Removed.
	(print_ip): Removed.
	(grub_cmd_pxe): Removed
	(grub_cmd_pxe_unload): New function.
	* fs/i386/pc/pxe.c (grub_pxe_disk_data): New structure.
	(grub_pxe_your_ip): Made static.
	(grub_pxe_default_server_ip): Likewise.
	(grub_pxe_default_gateway_ip): Likewise.
	(grub_pxe_blksize): Likewise.
	(parse_ip): New function.
	(grub_pxe_open): Support server and gateway specification.
	(grub_pxe_close): Free disk->data.
	(grub_pxefs_open): Use disk->data.
	(grub_pxefs_read): Likewise.
	(grub_env_write_readonly): New function.
	(set_mac_env): Likewise.
	(set_env_limn_ro): Likewise.
	(parse_dhcp_vendor): Likewise.
	(grub_pxe_detect): Set the environment variables.
	(set_ip_env): New function.
	(write_ip_env): Likewise.
	(grub_env_write_pxe_default_server): Likewise.
	(grub_env_write_pxe_default_gateway): Likewise.
	(grub_env_write_pxe_blocksize): Likewise.
	(GRUB_MOD_INIT(pxe)): Set environment variables.
	* include/grub/i386/pc/pxe.h (grub_pxe_mac_addr): Rename to ...
	(grub_pxe_mac_addr_t): ... this. All users updated.
	(grub_pxe_your_ip): Removed.
	(grub_pxe_server_ip): Likewise.
	(grub_pxe_gateway_ip): Likewise.
	(grub_pxe_blksize): Likewise.