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/*
* first.inc - constants for assembler module
*
* Copyright (C) 1995,1998 Gero Kuhlmann <gero@gkminix.han.de>
* Copyright (C) 1996,1997 Gero Kuhlmann <gero@gkminix.han.de>
* and Markus Gutschke <gutschk@math.uni-muenster.de>
*
* This program 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 2 of the License, or
* any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
*====================================================================
*
* Definitions for allocating dynamic memory, which is used to hold
* temporary working buffers.
*/
/*
* The MAX_MEM segment address must be within the range of addresses
* contained in MIN_MEM number of kB.
*/
#define MIN_MEM 616 /* Minimum number of kB of base mem */
#define MAX_MEM 0x9800 /* Maximum usable segment (see SPEC.DOC) */
#define STACK_SIZE 4096 /* Size of static stack memory */
#define CMDL_SIZE 4096 /* Size of static command line memory */
#define MAX_PATH_LEN 1024 /* Maximum length of path name */
#define MAX_BOOTP_LEN 512 /* Maximum length of bootp record */
#define MAX_ADDRS_LEN 512 /* Maximum length of IP addr string */
#define MAX_DYNAMIC_LEN MAX_PATH_LEN+MAX_BOOTP_LEN+MAX_ADDRS_LEN
/*
*====================================================================
*
* Vendor information for the boot rom image. These values have to be
* identical to those in mknbi.h.
*/
#define VENDOR_MAGIC "mknbi-linux" /* vendor ID */
#define VENDOR_SIZE 3 /* size of vendor ID in dwords */
#define VENDOR_BOOTL 16 /* tag for boot loader segment */
#define VENDOR_CMDL 17 /* tag for command line segment */
#define VENDOR_INIT 18 /* tag for floppy boot sector */
#define VENDOR_SETUP 19 /* tag for kernel setup segment */
#define VENDOR_KERNEL 20 /* tag for kernel segment */
#define VENDOR_RAMDISK 21 /* tag for ramdisk image */
/*
*====================================================================
*
* Layout and magic ID of boot rom image header. These values have to
* be identical to those used by the boot rom. See SPEC.DOC of the
* boot rom source for further information.
*/
#define BOOT_MAGIC 0x1B031336 /* boot image header magic cookie */
#define BOOT_SIZE 512 /* total size of boot image header */
#define BOOT_HD_SIZE 4 /* size of header in dwords */
#define BOOT_HD_MAGIC 0 /* offset for header magic number */
#define BOOT_HD_LENGTH 4 /* offset for header length */
#define BOOT_HD_FLAG1 5 /* offset for header flag 1 */
#define BOOT_HD_FLAG2 6 /* offset for header flag 2 */
#define BOOT_HD_FLAG3 7 /* offset for header flag 3 */
#define BOOT_HD_LOCN 8 /* offset for header location */
#define BOOT_HD_EXEC 12 /* offset for execute address */
#define BOOT_HD_VENDOR 16 /* offset for header vendor information */
#define BOOT_LD_SIZE 4 /* size of load record in dwords */
#define BOOT_LD_LENGTH 0 /* offset for load record length */
#define BOOT_LD_TAG1 1 /* offset for load record tag 1 */
#define BOOT_LD_TAG2 2 /* offset for load record tag 2 */
#define BOOT_LD_FLAGS 3 /* offset for load record flags */
#define BOOT_LD_ADDR 4 /* offset for absolute address */
#define BOOT_LD_ILENGTH 8 /* offset for image length */
#define BOOT_LD_MLENGTH 12 /* offset for memory length */
#define BOOT_LD_VENDOR 16 /* offset for vendor information */
#define BOOT_FLAG_B0 0x01 /* mask for load record flag B0 */
#define BOOT_FLAG_B1 0x02 /* mask for load record flag B1 */
#define BOOT_FLAG_EOF 0x04 /* mask for load record flag EOF */
/*
*====================================================================
*
* Ramdisk images can be loaded in three different ways:
* RD_AUTO -- The ramdisk image is loaded at either 0x100000 or right
* behind the kernel image; at run-time it will be moved
* to the end of physical memory or right before 0x1000000.
* This technique guarantees maximum compatibility with
* broken BIOS versions without making assumptions on the
* way, the BOOT-Prom determined the end of memory. The
* drawback is, that moving the image costs some extra time.
* RD_EOM -- The ramdisk image is loaded right before the end of
* physical memory. It is the BOOT-Proms responsibility to do
* this reliably. This might cause problems with some ancient
* BIOS versions, if the computer is equipped with more then
* 16M of main memory.
* RD_FIXED -- The user provided a fixed load address for the ramdisk
* image. This entails possible compatibility restrictions
* when moving the image from one client to another. OTOH,
* it could be the final solution if everything else fails...
*/
#define RD_AUTO 0
#define RD_EOM 1
#define RD_FIXED 2
/*
*====================================================================
*
* Layout and magic ID of bootp record. Refer to RFC 951, RFC 1048
* and RFC 1533 for further information. Vendor tag 129 is special in
* that it is in the range of tags which can be freely used (see
* RFC 1533). It will be used by first.S to add a string at the end
* of the kernel command line. The BOOTP record can be longer than
* the standard length as the bootrom might be able to load a vendor
* extension file via tftp.
*/
#define BOOTP_MAGIC_RFC 0x63, 0x82, 0x53, 0x63 /* RFC 1048 vendor ID */
#define BOOTP_MAGIC_CMU 0x43, 0x4D, 0x55, 0x00 /* CMU vendor ID */
#define BOOTP_MAGIC_STA 0x53, 0x54, 0x41, 0x4E /* Stanford vendor ID */
#define BOOTP_MAGIC_LEN 4 /* length of vendor ID */
#define BOOTP_REQUEST 1 /* bootp OP-code */
#define BOOTP_REPLY 2
#define BOOTP_OP 0 /* offset to bootp OP-code */
#define BOOTP_HTYPE 1 /* offset to hardware type */
#define BOOTP_HLEN 2 /* offset to length of hardware addr */
#define BOOTP_HOPS 3 /* offset to number of gateway hops */
#define BOOTP_XID 4 /* offset to transfer ID */
#define BOOTP_SECS 8 /* offset to seconds since boot began */
#define BOOTP_CIADDR 12 /* offset to client IP address */
#define BOOTP_YIADDR 16 /* offset to "your" IP address */
#define BOOTP_SIADDR 20 /* offset to server IP address */
#define BOOTP_GIADDR 24 /* offset to gateway IP address */
#define BOOTP_CHADDR 28 /* offset to hardware address */
#define BOOTP_SNAME 44 /* offset to server name */
#define BOOTP_FILE 108 /* offset to name of boot file */
#define BOOTP_VEND 236 /* offset to vendor information */
#define BOOTP_SIZE 300 /* size of complete bootp record */
#define BOOTP_RFC_NOP 0 /* RFC vendor tag for NO-OP */
#define BOOTP_RFC_MSK 1 /* RFC vendor tag for netmask */
#define BOOTP_RFC_GWY 3 /* RFC vendor tag for gateway */
#define BOOTP_RFC_HNAME 12 /* RFC vendor tag for host name */
#define BOOTP_RFC_ROOT 17 /* RFC vendor tag for root directory */
#define BOOTP_RFC_VID 128 /* Vendor tag: magic identification */
#ifndef BOOTP_RFC_CMDAD
#define BOOTP_RFC_CMDAD 129 /* Addition to kernel command line */
#endif
#ifndef BOOTP_RFC_RDEV
#define BOOTP_RFC_RDEV 130 /* Device by which to find root FS */
#endif
#define BOOTP_RFC_VSEL 176 /* index to user selected image */
#define BOOTP_RFC_END 255 /* RFC vendor tag for end of record */
#define BOOTP_VID_1 0x45E4
#define BOOTP_VID_2 0x6874
/*
*====================================================================
*
* The command line descriptor is placed in the floppy boot sector area
* and looks like this:
*
* 0x90020-0x90021 2 bytes command line magic number
* 0x90022-0x90023 2 bytes command line offs. relative to floppy boot sec
* 0x901FA-0x901FB 2 bytes video mode
*/
#define CL_MAGIC_ADDR 0x20 /* command line magic number */
#define CL_MAGIC 0xA33F /* very unusual command sequence */
#define CL_OFFSET 0x22 /* command line offset */
#define VGA_OFFSET 0x1FA /* video mode */
/*
*====================================================================
*
* The setup-header has to be changed in order to tell the kernel about a
* loaded ramdisk image
*
* +2 4 bytes setup magic number
* +6 2 bytes setup version number
* +16 1 byte type of loader
* +17 1 byte load flags
* bit 0: loaded high
* bit 7: can use heap
* +18 2 bytes setup move size
* +20 4 bytes protected mode start address
* +24 4 bytes ramdisk image start address
* +28 4 bytes ramdisk image size
* +32 2 bytes heap pointer
*
* This only works with Linux kernels 1.3.73 or above; that is why the
* setup magic number and the setup version number need to be verified
* before relying on the layout of this data structure.
*/
#define SU_MAGIC_ADDR 2
#define SU_VERSION_ADDR 6
#define SU_TYPE_OF_LOADER 16
#define SU_LOAD_FLAGS 17
#define SU_MOVE_SIZE 18
#define SU_32_START 20
#define SU_RAMDISK_START 24
#define SU_RAMDISK_SIZE 28
#define SU_HEAP 32
#define SU_MAGIC_L 0x6448
#define SU_MAGIC_H 0x5372
#define SU_VERSION 0x0201
#define SU_MY_TYPE_OF_LOADER 0x41
#define SU_MY_LOAD_FLAGS 0x80
#define SU_HEAP_END 0x9E00
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