/* * Copyright (c) 2004 The DragonFly Project. All rights reserved. * * This code is derived from software contributed to The DragonFly Project * by Matthew Dillon <dillon@backplane.com> * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name of The DragonFly Project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific, prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $DragonFly: src/sys/boot/pc32/bootasm.h,v 1.4 2004/07/27 19:37:15 dillon Exp $ */ /* * Set the bootloader address set. * * UNSET - default backwards compatible boot blocks * 1 - experimental move addresses above 0x1000 and hardwire the user * stack. * 2 - experimental move addresses abobe 0x2000 and hardwire the user * stack. * NOTE: some changes to the standard bootloader address set and the * rest of the code are not reflected in the experimental sets */ /* #define BOOT_NEWBOOTLOADER 2 */ /* * Various fixed constants that do not change */ #define BDA_MEM 0x413 /* Free memory */ #define BDA_SCR 0x449 /* Video mode */ #define BDA_POS 0x450 /* Cursor position */ #define BDA_BOOT 0x472 /* Boot howto flag */ #define BDA_NHRDRV 0x475 /* Number of drivers found by BIOS */ #define BDA_KEYBOARD 0x496 /* BDA byte with keyboard bit */ /* * Structural equivalences */ #define BOOTINFO_SIZE 0x48 /* bootinfo structure size */ #define MEM_ARG_SIZE 0x18 #define MEM_PAGE_SIZE 0x1000 #define MEM_BTX_LDR_OFF MEM_PAGE_SIZE /* offset of btx in the loader */ #define USR_ARGOFFSET (BOOTINFO_SIZE+MEM_ARG_SIZE) /* -------- WARNING, BOOT0 STACK BELOW MEM_BIOS_LADDR -------- */ #define MEM_BIOS_LADDR 0x7c00 /* Load address (static/BIOS) */ /* * This is the origin of boot2.bin relative to the BTX user address space * (e.g. physical address would be MEM_BTX_USR+BOOT2_VORIGIN). * * The physical origin is typically around 0xC000 and limits the size of * boot2 to 16K, otherwise the loader will overflow the segment in v86 mode. */ #define BOOT2_VORIGIN 0x2000 /* * NOTE: BOOT0_ORIGIN is extracted from this file and used in boot0/Makefile * BOOT1_ORIGIN is extracted from this file and used in boot2/Makefile * * NOTE: boot0 has a variable space after its sector which contains * the fake partition and other variables. ~128 bytes should be reserved * for this variable space, but it may overlap BOOT1's data space. */ #if !defined(BOOT_NEWBOOTLOADER) /************************************************************************ * STANDARD BOOTLOADER ADDRESS SET * ************************************************************************ * * */ #define USR_ARGSPACE 0x1000 /* BTX loader / ttl argspace reserved */ #define BOOT0_ORIGIN 0x600 /* boot0 relocated to (512+128 bytes) */ /* -------- WARNING, BOOT1 STACK BELOW BOOT1_ORIGIN ------- */ #define BOOT1_ORIGIN 0x700 /* boot1 relocated to (512 bytes) */ #define MEM_ARG 0x900 /* tmp arg store cdboot/pxeboot */ #define MEM_BTX_ESP 0x1000 /* btxldr top of stack? */ #define MEM_BTX_START 0x1000 /* start of BTX memory */ #define MEM_BTX_ESP0 0x1800 /* Supervisor stack */ #define MEM_BTX_BUF 0x1800 /* Scratch buffer stack */ #define MEM_BTX_ESPR 0x5e00 /* Real mode stack */ #define MEM_BTX_IDT 0x5e00 /* IDT */ #define MEM_BTX_TSS 0x5f98 /* TSS */ #define MEM_BTX_MAP 0x6000 /* I/O bit map */ #define MEM_BTX_TSS_END 0x7fff /* Start of user memory */ /* * NOTE: page table location is hardwired in /usr/src/usr.sbin/btxld/btx.h */ #define MEM_BTX_ZEND 0x7000 /* Zero from IDT to here in btx.S */ /******************** 0x7c00 BIOS LOAD ADDRESS (512 bytes) **********/ /* * NOTE: BOOT2_LOAD_BUF also determines where the btx loader and boot2.bin * code are loaded, since they are all in the boot2 file. */ #define BOOT2_LOAD_BUF 0x8c00 /* boot1 loads boot2 */ #define MEM_BTX_ORG 0x9000 /* base of BTX code */ #define MEM_BTX_ENTRY 0x9010 /* BTX starts execution here */ /* * WARNING! The USR area may be messed around with in 16 bit code mode, * data loaded should probably not cross 0xffff (e.g. boot2 loads * ~8K at MEM_BTX_USR). * * MEM_BTX_USR is basically the segment offset BTX uses when * running 'client' code. So address 0 in the client code will * actually be physical address MEM_BTX_USR. */ #define MEM_BTX_USR 0xa000 /* base of BTX client/user memory */ #define MEM_BTX_USR_ARG 0xa100 /* * By default the user stack is (theoretically) placed at the top of * BIOS memory (typically around the 640K mark). See btx.S. BTX loads * the stack from a BIOS memory address (BDA_MEM) rather than figuring it * out from the smap. * * There aren't really any other places we can put it short of intruding on * the kernel/module load space. */ /*#define MEM_BTX_USR_STK 0x3000000*/ /*#define MEM_BTX_USR_STK 0x0F0000*/ #elif defined(BOOT_NEWBOOTLOADER) && BOOT_NEWBOOTLOADER == 1 /************************************************************************ * EXPERIMENTAL BOOTLOADER ADDRESS SET 1 * ************************************************************************ * * */ #define USR_ARGSPACE 0x1000 /* BTX loader / ttl argspace reserved */ #define MEM_BTX_USR_STK 0x90000 /* (phys addr) btx client usr stack */ #define MEM_BTX_START 0x1000 /* (unchanged) */ #define MEM_BTX_ESP0 0x1800 /* (unchanged) */ #define MEM_BTX_BUF 0x1800 /* (unchanged) */ #define MEM_BTX_ESP1 0x1e00 /* (unchanged) */ #define MEM_BTX_IDT 0x1e00 /* (unchanged) */ #define MEM_BTX_TSS 0x1f98 /* (unchanged) */ #define MEM_BTX_MAP 0x2000 /* (unchanged) */ #define MEM_BTX_DIR 0x4000 /* (unchanged) */ #define MEM_BTX_TBL 0x5000 /* (unchanged) */ #define MEM_BTX_ZEND 0x7000 /* (unchanged) */ #define MEM_BTX_ESP 0x7800 /* don't use 0x1000 */ #define BOOT0_ORIGIN 0x7800 /* boot0 relocated */ #define BOOT1_ORIGIN 0x7900 /* boot1 relocated (data only?) */ #define MEM_ARG 0x7b00 /* cdboot/pxeboot disk/slice xfer */ /******************** 0x7c00 BIOS LOAD ADDRESS (512 bytes) **********/ #define BOOT2_LOAD_BUF 0x8c00 /* (unchanged) */ #define MEM_BTX_ORG 0x9000 /* (unchanged) */ #define MEM_BTX_ENTRY 0x9010 /* (unchanged) */ #define MEM_BTX_USR 0xa000 /* (unchanged) */ #define MEM_BTX_USR_ARG 0xa100 /* (unchanged) */ #elif defined(BOOT_NEWBOOTLOADER) && BOOT_NEWBOOTLOADER == 2 /************************************************************************ * EXPERIMENTAL BOOTLOADER ADDRESS SET 2 * ************************************************************************ * * */ #define USR_ARGSPACE 0x1000 /* BTX loader / ttl argspace reserved */ #define MEM_BTX_USR_STK 0x90000 /* (phys addr) btx client usr stack */ #define MEM_BTX_START 0x2000 /* (unchanged) */ #define MEM_BTX_ESP0 0x2800 /* (unchanged) */ #define MEM_BTX_BUF 0x2800 /* (unchanged) */ #define MEM_BTX_ESP1 0x2e00 /* (unchanged) */ #define MEM_BTX_IDT 0x2e00 /* (unchanged) */ #define MEM_BTX_TSS 0x2f98 /* (unchanged) */ #define MEM_BTX_MAP 0x3000 /* (unchanged) */ #define MEM_BTX_DIR 0x5000 /* (unchanged) */ /****** MEM_BTX_TBL (16K) SUPPORT REMOVED ***********************/ #define MEM_BTX_ZEND 0x6000 /* (unchanged) */ #define MEM_BTX_ESP 0x7800 /* don't use 0x1000 */ #define BOOT0_ORIGIN 0x7800 /* boot0 relocated */ #define BOOT1_ORIGIN 0x7900 /* boot1 relocated (data only?) */ #define MEM_ARG 0x7b00 /* cdboot/pxeboot disk/slice xfer */ /******************** 0x7c00 BIOS LOAD ADDRESS (512 bytes) **********/ #define BOOT2_LOAD_BUF 0x8c00 /* (unchanged) */ #define MEM_BTX_ORG 0x9000 /* (unchanged) */ #define MEM_BTX_ENTRY 0x9010 /* (unchanged) */ #define MEM_BTX_USR 0xa000 /* base of BTX client/user memory */ #define MEM_BTX_USR_ARG 0xa100 /* boot1->boot2 disk/slice xfer */ #else #error "BAD BOOT_NEWBOOTLOADER SETTING. UNSET TO GET DEFAULT" #endif /* BOOT_NEWBOOTLOADER */
