1 /* ********************************************************************* 2 * Broadcom Common Firmware Environment (CFE) 3 * 4 * Intel (X86) processor startup File: protmode.h 5 * 6 * macros and functions particular to Intel X86 protected-mode 7 * features. 8 * 9 * Author: Mitch Lichtenberg 10 * 11 ********************************************************************* 12 * 13 * Copyright 2000,2001,2003 14 * Broadcom Corporation. All rights reserved. 15 * 16 * This software is furnished under license and may be used and 17 * copied only in accordance with the following terms and 18 * conditions. Subject to these conditions, you may download, 19 * copy, install, use, modify and distribute modified or unmodified 20 * copies of this software in source and/or binary form. No title 21 * or ownership is transferred hereby. 22 * 23 * 1) Any source code used, modified or distributed must reproduce 24 * and retain this copyright notice and list of conditions 25 * as they appear in the source file. 26 * 27 * 2) No right is granted to use any trade name, trademark, or 28 * logo of Broadcom Corporation. The "Broadcom Corporation" 29 * name may not be used to endorse or promote products derived 30 * from this software without the prior written permission of 31 * Broadcom Corporation. 32 * 33 * 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR 34 * IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED 35 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 36 * PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT 37 * SHALL BROADCOM BE LIABLE FOR ANY DAMAGES WHATSOEVER, AND IN 38 * PARTICULAR, BROADCOM SHALL NOT BE LIABLE FOR DIRECT, INDIRECT, 39 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 40 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 41 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 42 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 43 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 44 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE), EVEN IF ADVISED OF 45 * THE POSSIBILITY OF SUCH DAMAGE. 46 ********************************************************************* */ 47 48/* ********************************************************************* 49 * Descriptor stuff 50 ********************************************************************* */ 51 52#define GDT_NULL_DESCR() .word 0,0,0,0 53#define GDT_CODE_DESCR() .word 0xFFFF,0x0000,0x9B00,0x00CF 54#define GDT_DATA_DESCR() .word 0xFFFF,0x0000,0x9300,0x00CF 55 56#define GDT_GDT_DESCR(ptr,cnt) .word ((cnt)*8-1) ; .long ptr 57 58#define GDT_DESCR_SIZE 8 59 60/* ********************************************************************* 61 * Selectors for our GDT 62 ********************************************************************* */ 63 64#define SEG_NULL 0x0000 65#define SEG_CODE 0x0008 66#define SEG_DATA 0x0010 67 68#define SEG_COUNT 3 69 70/* ********************************************************************* 71 * Macros to construct instructions 72 ********************************************************************* */ 73 74#define OP32 .byte 0x66 ; 75 76#define JMPFAR32(x) OP32 ; .byte 0xEA ; .long x ; .word SEG_CODE 77 78/* ********************************************************************* 79 * Intel control registers 80 ********************************************************************* */ 81 82/* 83 * CR0 - Protected Mode control 84 */ 85 86#define CR0_PG 0x80000000 /* Paging */ 87#define CR0_CD 0x40000000 /* Cache Disabled */ 88#define CR0_NW 0x20000000 /* Not WriteThrough */ 89#define CR0_AM 0x00040000 /* Alignment Check */ 90#define CR0_WP 0x00010000 /* Write Protect */ 91#define CR0_MBO 0x00000010 /* always 1 */ 92#define CR0_TS 0x00000008 /* Task Switch */ 93#define CR0_EM 0x00000004 /* x87 FPU trapped */ 94#define CR0_MP 0x00000002 /* WAIT/FWAIT trapped */ 95#define CR0_PE 0x00000001 /* Protection Enable */ 96 97 98