xref: /netbsd-src/sys/arch/ia64/stand/ia64/ski/exec.c (revision a01d771b17cae1619415c5040dba980ae0477c9e)
1 /* $NetBSD: exec.c,v 1.6 2012/12/27 20:21:51 martin Exp $ */
2 
3 /*-
4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
9  * NASA Ames Research Center.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30  * POSSIBILITY OF SUCH DAMAGE.
31  */
32 /*-
33  * Copyright (c) 1992, 1993
34  *	The Regents of the University of California.  All rights reserved.
35  *
36  * This code is derived from software contributed to Berkeley by
37  * Ralph Campbell.
38  *
39  * Redistribution and use in source and binary forms, with or without
40  * modification, are permitted provided that the following conditions
41  * are met:
42  * 1. Redistributions of source code must retain the above copyright
43  *    notice, this list of conditions and the following disclaimer.
44  * 2. Redistributions in binary form must reproduce the above copyright
45  *    notice, this list of conditions and the following disclaimer in the
46  *    documentation and/or other materials provided with the distribution.
47  * 4. Neither the name of the University nor the names of its contributors
48  *    may be used to endorse or promote products derived from this software
49  *    without specific prior written permission.
50  *
51  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
52  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
53  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
54  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
55  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
56  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
57  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
59  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
60  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
61  * SUCH DAMAGE.
62  *
63  *	@(#)boot.c	8.1 (Berkeley) 6/10/93
64  */
65 
66 #include <sys/cdefs.h>
67 /* __FBSDID("$FreeBSD: src/sys/boot/ia64/libski/elf_freebsd.c,v 1.10 2004/04/05 23:41:28 imp Exp $"); */
68 
69 #include <lib/libsa/stand.h>
70 #include <lib/libsa/loadfile.h>
71 #include <lib/libkern/libkern.h>
72 
73 #include <sys/param.h>
74 #include <sys/lock.h>
75 
76 #include <machine/elf_machdep.h>
77 #include <machine/bootinfo.h>
78 #include <machine/ia64_cpu.h>
79 #include <machine/vmparam.h>
80 
81 #include "bootstrap.h"
82 #include "libski.h"
83 
84 #define _KERNEL
85 
86 static int	elf64_exec(struct preloaded_file *amp);
87 
88 struct file_format ia64_elf = { elf64_loadfile, elf64_exec };
89 
90 #define PTE_MA_WB	0
91 #define PTE_MA_UC	4
92 #define PTE_MA_UCE	5
93 #define PTE_MA_WC	6
94 #define PTE_MA_NATPAGE	7
95 
96 #define PTE_PL_KERN	0
97 #define PTE_PL_USER	3
98 
99 #define PTE_AR_R	0
100 #define PTE_AR_RX	1
101 #define PTE_AR_RW	2
102 #define PTE_AR_RWX	3
103 #define PTE_AR_R_RW	4
104 #define PTE_AR_RX_RWX	5
105 #define PTE_AR_RWX_RW	6
106 #define PTE_AR_X_RX	7
107 
108 /*
109  * A short-format VHPT entry. Also matches the TLB insertion format.
110  */
111 struct ia64_pte {
112 	u_int64_t	pte_p	:1;	/* bits 0..0 */
113 	u_int64_t	pte_rv1	:1;	/* bits 1..1 */
114 	u_int64_t	pte_ma	:3;	/* bits 2..4 */
115 	u_int64_t	pte_a	:1;	/* bits 5..5 */
116 	u_int64_t	pte_d	:1;	/* bits 6..6 */
117 	u_int64_t	pte_pl	:2;	/* bits 7..8 */
118 	u_int64_t	pte_ar	:3;	/* bits 9..11 */
119 	u_int64_t	pte_ppn	:38;	/* bits 12..49 */
120 	u_int64_t	pte_rv2	:2;	/* bits 50..51 */
121 	u_int64_t	pte_ed	:1;	/* bits 52..52 */
122 	u_int64_t	pte_ig	:11;	/* bits 53..63 */
123 };
124 
125 struct bootinfo bootinfo;
126 
127 void
enter_kernel(const char * filename,u_int64_t start,struct bootinfo * bi)128 enter_kernel(const char* filename, u_int64_t start, struct bootinfo *bi)
129 {
130 	printf("Entering %s at 0x%lx...\n", filename, start);
131 
132 	while (*filename == '/')
133 		filename++;
134 		ssc(0, (u_int64_t) filename, 0, 0, SSC_LOAD_SYMBOLS);
135 
136 	__asm __volatile("mov cr.ipsr=%0"
137 			 :: "r"(IA64_PSR_IC
138 				| IA64_PSR_DT
139 				| IA64_PSR_RT
140 				| IA64_PSR_IT
141 				| IA64_PSR_BN));
142 	__asm __volatile("mov cr.iip=%0" :: "r"(start));
143 	__asm __volatile("mov cr.ifs=r0;;");
144 	__asm __volatile("mov r8=%0" :: "r" (bi));
145 	__asm __volatile("rfi;;");
146 }
147 
148 static int
elf64_exec(struct preloaded_file * fp)149 elf64_exec(struct preloaded_file *fp)
150 {
151 	struct ia64_pte		pte;
152 	struct bootinfo		*bi;
153 
154 	if (strcmp(fp->f_type, ELF64_KERNELTYPE)) return(EFTYPE);
155 
156 
157 	/*
158 	 * Ugly hack, similar to linux. Dump the bootinfo into a
159 	 * special page reserved in the link map.
160 	 */
161 	bi = &bootinfo;
162 	memset(bi, 0, sizeof(struct bootinfo));
163 	bi_load(bi, fp, "");
164 
165 	/*
166 	 * Region 6 is direct mapped UC and region 7 is direct mapped
167 	 * WC. The details of this is controlled by the Alt {I,D}TLB
168 	 * handlers. Here we just make sure that they have the largest
169 	 * possible page size to minimise TLB usage.
170 	 */
171 	ia64_set_rr(IA64_RR_BASE(6), (6 << 8) | (28 << 2));
172 	ia64_set_rr(IA64_RR_BASE(7), (7 << 8) | (28 << 2));
173 
174 	memset(&pte, 0, sizeof(pte));
175 	pte.pte_p = 1;
176 	pte.pte_ma = PTE_MA_WB;
177 	pte.pte_a = 1;
178 	pte.pte_d = 1;
179 	pte.pte_pl = PTE_PL_KERN;
180 	pte.pte_ar = PTE_AR_RWX;
181 	pte.pte_ppn = 0;
182 
183 	__asm __volatile("mov cr.ifa=%0" :: "r"(IA64_RR_BASE(7)));
184 	__asm __volatile("mov cr.itir=%0" :: "r"(28 << 2));
185 	__asm __volatile("srlz.i;;");
186 	__asm __volatile("itr.i itr[%0]=%1;;"
187 			 :: "r"(0), "r"(*(u_int64_t*)&pte));
188 	__asm __volatile("srlz.i;;");
189 	__asm __volatile("itr.d dtr[%0]=%1;;"
190 			 :: "r"(0), "r"(*(u_int64_t*)&pte));
191 	__asm __volatile("srlz.i;;");
192 
193 	enter_kernel(fp->f_name, fp->marks[MARK_ENTRY], bi);
194 }
195