xref: /illumos-gate/usr/src/uts/intel/sys/bootsvcs.h (revision 7c478bd9)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #ifndef _SYS_BOOTSVCS_H
28 #define	_SYS_BOOTSVCS_H
29 
30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
31 
32 #ifdef	__cplusplus
33 extern "C" {
34 #endif
35 
36 /*
37  * Boot time configuration information objects
38  *
39  * The BS_VERSION version number should be incremented when adding
40  * new boot_syscalls entry points.  The kernel can check the boot_syscalls
41  * version number by looking up the BS_VERSION_PROP property in the
42  * device tree.  This version number allows the kernel to detect if the
43  * version of boot.bin that loaded it supports newer boot_syscalls entry
44  * points.  This in turn allows the kernel to potentially support
45  * backward compatibility with older versions of boot.bin that don't
46  * support newer entry points.
47  *
48  * (Before we get too carried away with extending this interface,
49  * realize how broken it is.  Even with a cleaner namespace than
50  * we used to have prior to S10, it is -extremely- difficult to
51  * interpose upon because the method pointer is NOT passed to the
52  * methods.  We would do well to extend the bootops and EOL this
53  * interface as fast as possible, rather than to add more to it.)
54  */
55 #define	BS_VERSION 4
56 #define	BS_VERSION_PROP "bs-version"
57 
58 typedef struct boot_syscalls {			/* offset */
59 	int	(*bsvc_getchar)();		/*  7 - getchar */
60 	void	(*bsvc_putchar)(int);		/*  8 - putchar */
61 	int	(*bsvc_ischar)();		/*  9 - ischar */
62 } boot_syscalls_t;
63 
64 #ifdef _KMDB
65 extern boot_syscalls_t *kmdb_sysp;
66 #define	SYSP	kmdb_sysp
67 #else /* !_KMDB */
68 extern boot_syscalls_t *sysp;
69 #define	SYSP	sysp
70 #endif
71 
72 #define	BSVC_GETCHAR(sysp)		(((sysp)->bsvc_getchar)())
73 #define	BSVC_PUTCHAR(sysp, c)		(((sysp)->bsvc_putchar)(c))
74 #define	BSVC_ISCHAR(sysp)		(((sysp)->bsvc_ischar)())
75 
76 #ifdef	__cplusplus
77 }
78 #endif
79 
80 #endif /* _SYS_BOOTSVCS_H */
81