Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
vectors.c
Go to the documentation of this file.
1 /*
2  * vectors.c
3  *
4  * Copyright (C) 1993, 1994 by Hamish Macdonald
5  *
6  * 68040 fixes by Michael Rausch
7  * 68040 fixes by Martin Apel
8  * 68040 fixes and writeback by Richard Zidlicky
9  * 68060 fixes by Roman Hodek
10  * 68060 fixes by Jesper Skov
11  *
12  * This file is subject to the terms and conditions of the GNU General Public
13  * License. See the file COPYING in the main directory of this archive
14  * for more details.
15  */
16 
17 /*
18  * Sets up all exception vectors
19  */
20 #include <linux/sched.h>
21 #include <linux/kernel.h>
22 #include <linux/linkage.h>
23 #include <linux/init.h>
24 #include <linux/kallsyms.h>
25 
26 #include <asm/setup.h>
27 #include <asm/fpu.h>
28 #include <asm/traps.h>
29 
30 /* assembler routines */
31 asmlinkage void system_call(void);
32 asmlinkage void buserr(void);
33 asmlinkage void trap(void);
34 asmlinkage void nmihandler(void);
35 #ifdef CONFIG_M68KFPU_EMU
36 asmlinkage void fpu_emu(void);
37 #endif
38 
39 e_vector vectors[256];
40 
41 /* nmi handler for the Amiga */
42 asm(".text\n"
43  __ALIGN_STR "\n"
44  "nmihandler: rte");
45 
46 /*
47  * this must be called very early as the kernel might
48  * use some instruction that are emulated on the 060
49  * and so we're prepared for early probe attempts (e.g. nf_init).
50  */
51 void __init base_trap_init(void)
52 {
53  if (MACH_IS_SUN3X) {
54  extern e_vector *sun3x_prom_vbr;
55 
56  __asm__ volatile ("movec %%vbr, %0" : "=r" (sun3x_prom_vbr));
57  }
58 
59  /* setup the exception vector table */
60  __asm__ volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));
61 
62  if (CPU_IS_060) {
63  /* set up ISP entry points */
64  asmlinkage void unimp_vec(void) asm ("_060_isp_unimp");
65 
66  vectors[VEC_UNIMPII] = unimp_vec;
67  }
68 
69  vectors[VEC_BUSERR] = buserr;
70  vectors[VEC_ILLEGAL] = trap;
71  vectors[VEC_SYS] = system_call;
72 }
73 
74 void __init trap_init (void)
75 {
76  int i;
77 
78  for (i = VEC_SPUR; i <= VEC_INT7; i++)
79  vectors[i] = bad_inthandler;
80 
81  for (i = 0; i < VEC_USER; i++)
82  if (!vectors[i])
83  vectors[i] = trap;
84 
85  for (i = VEC_USER; i < 256; i++)
86  vectors[i] = bad_inthandler;
87 
88 #ifdef CONFIG_M68KFPU_EMU
89  if (FPU_IS_EMU)
90  vectors[VEC_LINE11] = fpu_emu;
91 #endif
92 
93  if (CPU_IS_040 && !FPU_IS_EMU) {
94  /* set up FPSP entry points */
95  asmlinkage void dz_vec(void) asm ("dz");
96  asmlinkage void inex_vec(void) asm ("inex");
97  asmlinkage void ovfl_vec(void) asm ("ovfl");
98  asmlinkage void unfl_vec(void) asm ("unfl");
99  asmlinkage void snan_vec(void) asm ("snan");
100  asmlinkage void operr_vec(void) asm ("operr");
101  asmlinkage void bsun_vec(void) asm ("bsun");
102  asmlinkage void fline_vec(void) asm ("fline");
103  asmlinkage void unsupp_vec(void) asm ("unsupp");
104 
105  vectors[VEC_FPDIVZ] = dz_vec;
106  vectors[VEC_FPIR] = inex_vec;
107  vectors[VEC_FPOVER] = ovfl_vec;
108  vectors[VEC_FPUNDER] = unfl_vec;
109  vectors[VEC_FPNAN] = snan_vec;
110  vectors[VEC_FPOE] = operr_vec;
111  vectors[VEC_FPBRUC] = bsun_vec;
112  vectors[VEC_LINE11] = fline_vec;
113  vectors[VEC_FPUNSUP] = unsupp_vec;
114  }
115 
116  if (CPU_IS_060 && !FPU_IS_EMU) {
117  /* set up IFPSP entry points */
118  asmlinkage void snan_vec6(void) asm ("_060_fpsp_snan");
119  asmlinkage void operr_vec6(void) asm ("_060_fpsp_operr");
120  asmlinkage void ovfl_vec6(void) asm ("_060_fpsp_ovfl");
121  asmlinkage void unfl_vec6(void) asm ("_060_fpsp_unfl");
122  asmlinkage void dz_vec6(void) asm ("_060_fpsp_dz");
123  asmlinkage void inex_vec6(void) asm ("_060_fpsp_inex");
124  asmlinkage void fline_vec6(void) asm ("_060_fpsp_fline");
125  asmlinkage void unsupp_vec6(void) asm ("_060_fpsp_unsupp");
126  asmlinkage void effadd_vec6(void) asm ("_060_fpsp_effadd");
127 
128  vectors[VEC_FPNAN] = snan_vec6;
129  vectors[VEC_FPOE] = operr_vec6;
130  vectors[VEC_FPOVER] = ovfl_vec6;
131  vectors[VEC_FPUNDER] = unfl_vec6;
132  vectors[VEC_FPDIVZ] = dz_vec6;
133  vectors[VEC_FPIR] = inex_vec6;
134  vectors[VEC_LINE11] = fline_vec6;
135  vectors[VEC_FPUNSUP] = unsupp_vec6;
136  vectors[VEC_UNIMPEA] = effadd_vec6;
137  }
138 
139  /* if running on an amiga, make the NMI interrupt do nothing */
140  if (MACH_IS_AMIGA) {
141  vectors[VEC_INT7] = nmihandler;
142  }
143 }
144 
Generated on Thu Jan 10 2013 13:08:11 for Linux Kernel by   doxygen 1.8.2