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Commit	Line	Data
	1	/*
	2	* Copyright (c) 2004 The DragonFly Project. All rights reserved.
	3	*
	4	* This code is derived from software contributed to The DragonFly Project
	5	* by Matthew Dillon <dillon@backplane.com>
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	*
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in
	15	* the documentation and/or other materials provided with the
	16	* distribution.
	17	* 3. Neither the name of The DragonFly Project nor the names of its
	18	* contributors may be used to endorse or promote products derived
	19	* from this software without specific, prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	22	* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	23	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
	24	* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
	25	* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
	26	* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
	27	* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	28	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
	29	* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	30	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
	31	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	32	* SUCH DAMAGE.
	33	*
	34	* $DragonFly: src/sys/boot/pc32/bootasm.h,v 1.4 2004/07/27 19:37:15 dillon Exp $
	35	*/
	36
	37	/*
	38	* Set the bootloader address set.
	39	*
	40	* UNSET - default backwards compatible boot blocks
	41	* 1 - experimental move addresses above 0x1000 and hardwire the user
	42	* stack.
	43	* 2 - experimental move addresses abobe 0x2000 and hardwire the user
	44	* stack.
	45	*/
	46	/* #define BOOT_NEWBOOTLOADER 2 */
	47
	48	/*
	49	* Various fixed constants that do not change
	50	*/
	51
	52	#define BDA_MEM 0x413 /* Free memory */
	53	#define BDA_KEYFLAGS 0x417 /* Keyboard shift-state flags */
	54	#define BDA_SCR 0x449 /* Video mode */
	55	#define BDA_POS 0x450 /* Cursor position */
	56	#define BDA_BOOT 0x472 /* Boot howto flag */
	57	#define BDA_NHRDRV 0x475
	58	#define BDA_KEYBOARD 0x496 /* BDA byte with keyboard bit */
	59
	60	/*
	61	* Structural equivalences
	62	*/
	63	#define BOOTINFO_SIZE 0x48 /* bootinfo structure size */
	64	#define MEM_ARG_SIZE 0x18
	65	#define MEM_PAGE_SIZE 0x1000
	66	#define MEM_BTX_LDR_OFF MEM_PAGE_SIZE /* offset of btx in the loader */
	67	#define USR_ARGOFFSET (BOOTINFO_SIZE+MEM_ARG_SIZE)
	68
	69	/* -------- WARNING, BOOT0 STACK BELOW MEM_BIOS_LADDR -------- */
	70	#define MEM_BIOS_LADDR 0x7c00 /* Load address (static/BIOS) */
	71
	72	/*
	73	* This is the origin of boot2.bin relative to the BTX user address space
	74	* (e.g. physical address would be MEM_BTX_USR+BOOT2_VORIGIN).
	75	*/
	76	#define BOOT2_VORIGIN 0x4000
	77
	78	/*
	79	* NOTE: BOOT0_ORIGIN is extracted from this file and used in boot0/Makefile
	80	* BOOT1_ORIGIN is extracted from this file and used in boot2/Makefile
	81	*
	82	* NOTE: boot0 has a variable space after its sector which contains
	83	* the fake partition and other variables. ~128 bytes should be reserved
	84	* for this variable space, but it may overlap BOOT1's data space.
	85	*/
	86
	87	#if !defined(BOOT_NEWBOOTLOADER)
	88
	89	/************************************************************************
	90	* STANDARD BOOTLOADER ADDRESS SET *
	91	************************************************************************
	92	*
	93	*
	94	*/
	95
	96	#define USR_ARGSPACE 0x1000 /* BTX loader / ttl argspace reserved */
	97
	98	#define BOOT0_ORIGIN 0x600 /* boot0 relocated to (512+128 bytes) */
	99	/* -------- WARNING, BOOT1 STACK BELOW BOOT1_ORIGIN ------- */
	100	#define BOOT1_ORIGIN 0x700 /* boot1 relocated to (512 bytes) */
	101	#define MEM_ARG 0x900 /* tmp arg store cdboot/pxeboot */
	102
	103	#define MEM_BTX_ESP 0x1000 /* btxldr top of stack? */
	104	#define MEM_BTX_START 0x1000 /* start of BTX memory */
	105	#define MEM_BTX_ESP0 0x1800 /* Supervisor stack */
	106	#define MEM_BTX_BUF 0x1800 /* Scratch buffer stack */
	107	#define MEM_BTX_ESP1 0x1e00 /* Link stack */
	108	#define MEM_BTX_IDT 0x1e00 /* IDT */
	109	#define MEM_BTX_TSS 0x1f98 /* TSS */
	110	#define MEM_BTX_MAP 0x2000 /* I/O bit map */
	111	#define MEM_BTX_DIR 0x4000 /* Page directory */
	112
	113	/*
	114	* NOTE: page table location is hardwired in /usr/src/usr.sbin/btxld/btx.h
	115	*/
	116	#define MEM_BTX_TBL 0x5000 /* Page tables */
	117	#define MEM_BTX_ZEND 0x7000 /* Zero from IDT to here in btx.S */
	118
	119	/****************** 0x7c00 BIOS LOAD ADDRESS (512 bytes) ********/
	120
	121	/*
	122	* NOTE: BOOT2_LOAD_BUF also determines where the btx loader and boot2.bin
	123	* code are loaded, since they are all in the boot2 file.
	124	*/
	125	#define BOOT2_LOAD_BUF 0x8c00 /* boot1 loads boot2 */
	126	#define MEM_BTX_ORG 0x9000 /* base of BTX code */
	127	#define MEM_BTX_ENTRY 0x9010 /* BTX starts execution here */
	128	/*
	129	* WARNING! The USR area may be messed around with in 16 bit code mode,
	130	* data loaded should probably not cross 0xffff (e.g. boot2 loads
	131	* ~8K at MEM_BTX_USR).
	132	*
	133	* MEM_BTX_USR is basically the segment offset BTX uses when
	134	* running 'client' code. So address 0 in the client code will
	135	* actually be physical address MEM_BTX_USR.
	136	*/
	137	#define MEM_BTX_USR 0xa000 /* base of BTX client/user memory */
	138	#define MEM_BTX_USR_ARG 0xa100
	139
	140	#elif defined(BOOT_NEWBOOTLOADER) && BOOT_NEWBOOTLOADER == 1
	141
	142	/************************************************************************
	143	* EXPERIMENTAL BOOTLOADER ADDRESS SET 1 *
	144	************************************************************************
	145	*
	146	*
	147	*/
	148
	149	#define USR_ARGSPACE 0x1000 /* BTX loader / ttl argspace reserved */
	150	#define MEM_BTX_USR_STK 0x90000 /* (phys addr) btx client usr stack */
	151
	152	#define MEM_BTX_START 0x1000 /* (unchanged) */
	153	#define MEM_BTX_ESP0 0x1800 /* (unchanged) */
	154	#define MEM_BTX_BUF 0x1800 /* (unchanged) */
	155	#define MEM_BTX_ESP1 0x1e00 /* (unchanged) */
	156	#define MEM_BTX_IDT 0x1e00 /* (unchanged) */
	157	#define MEM_BTX_TSS 0x1f98 /* (unchanged) */
	158	#define MEM_BTX_MAP 0x2000 /* (unchanged) */
	159	#define MEM_BTX_DIR 0x4000 /* (unchanged) */
	160	#define MEM_BTX_TBL 0x5000 /* (unchanged) */
	161	#define MEM_BTX_ZEND 0x7000 /* (unchanged) */
	162
	163	#define MEM_BTX_ESP 0x7800 /* don't use 0x1000 */
	164	#define BOOT0_ORIGIN 0x7800 /* boot0 relocated */
	165	#define BOOT1_ORIGIN 0x7900 /* boot1 relocated (data only?) */
	166	#define MEM_ARG 0x7b00 /* cdboot/pxeboot disk/slice xfer */
	167	/****************** 0x7c00 BIOS LOAD ADDRESS (512 bytes) ********/
	168
	169	#define BOOT2_LOAD_BUF 0x8c00 /* (unchanged) */
	170	#define MEM_BTX_ORG 0x9000 /* (unchanged) */
	171	#define MEM_BTX_ENTRY 0x9010 /* (unchanged) */
	172
	173	#define MEM_BTX_USR 0xa000 /* (unchanged) */
	174	#define MEM_BTX_USR_ARG 0xa100 /* (unchanged) */
	175
	176
	177	#elif defined(BOOT_NEWBOOTLOADER) && BOOT_NEWBOOTLOADER == 2
	178
	179	/************************************************************************
	180	* EXPERIMENTAL BOOTLOADER ADDRESS SET 2 *
	181	************************************************************************
	182	*
	183	*
	184	*/
	185	#define USR_ARGSPACE 0x1000 /* BTX loader / ttl argspace reserved */
	186	#define MEM_BTX_USR_STK 0x90000 /* (phys addr) btx client usr stack */
	187
	188	#define MEM_BTX_START 0x2000 /* (unchanged) */
	189	#define MEM_BTX_ESP0 0x2800 /* (unchanged) */
	190	#define MEM_BTX_BUF 0x2800 /* (unchanged) */
	191	#define MEM_BTX_ESP1 0x2e00 /* (unchanged) */
	192	#define MEM_BTX_IDT 0x2e00 /* (unchanged) */
	193	#define MEM_BTX_TSS 0x2f98 /* (unchanged) */
	194	#define MEM_BTX_MAP 0x3000 /* (unchanged) */
	195	#define MEM_BTX_DIR 0x5000 /* (unchanged) */
	196	/**** MEM_BTX_TBL (16K) SUPPORT REMOVED *********************/
	197	#define MEM_BTX_ZEND 0x6000 /* (unchanged) */
	198
	199	#define MEM_BTX_ESP 0x7800 /* don't use 0x1000 */
	200	#define BOOT0_ORIGIN 0x7800 /* boot0 relocated */
	201	#define BOOT1_ORIGIN 0x7900 /* boot1 relocated (data only?) */
	202	#define MEM_ARG 0x7b00 /* cdboot/pxeboot disk/slice xfer */
	203	/****************** 0x7c00 BIOS LOAD ADDRESS (512 bytes) ********/
	204
	205	#define BOOT2_LOAD_BUF 0x8c00 /* (unchanged) */
	206	#define MEM_BTX_ORG 0x9000 /* (unchanged) */
	207	#define MEM_BTX_ENTRY 0x9010 /* (unchanged) */
	208
	209	#define MEM_BTX_USR 0xa000 /* base of BTX client/user memory */
	210	#define MEM_BTX_USR_ARG 0xa100 /* boot1->boot2 disk/slice xfer */
	211
	212	#else
	213
	214	#error "BAD BOOT_NEWBOOTLOADER SETTING. UNSET TO GET DEFAULT"
	215
	216	#endif /* BOOT_NEWBOOTLOADER */
	217