* kern/i386/pc/lzo1x.S: New file.
* util/i386/pc/pupa-mkimage.c: Include lzo1x.h.
(compress_kernel): New variable.
(generate_image): Heavily modified to support compressing a
large part of the core image.
* util/misc.c (pupa_util_read_image): Fix a file descriptor
leak.
(pupa_util_load_image): New function.
* kern/i386/pc/startup.S: Include pupa/machine/kernel.h.
(pupa_compressed_size): New variable.
(codestart): Enable Gate A20 here.
Decompress the compressed part of the core image.
Rearrange the code to put functions and variables which are
required for initialization in the non-compressed part.
Include lzo1x.S.
* kern/i386/pc/init.c (pupa_machine_init): Don't enable Gate A20
here.
* include/pupa/util/misc.h (pupa_util_write_image): Declared.
* include/pupa/i386/pc/kernel.h
(PUPA_KERNEL_MACHINE_COMPRESSED_SIZE): New macro.
(PUPA_KERNEL_MACHINE_INSTALL_DOS_PART): Increased by 4.
(PUPA_KERNEL_MACHINE_INSTALL_BSD_PART): Likewise.
(PUPA_KERNEL_MACHINE_PREFIX): Likewise.
(PUPA_KERNEL_MACHINE_RAW_SIZE): New macro.
* conf/i386-pc.rmk (pupa_mkimage_LDFLAGS): New variable.
* genmk.rb (Image#rule): Put LDFLAGS at the end of a line.
(Utility#rule): Likewise.
* configure.ac: Check if LZO is available.
