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