arch/m68k/kernel/vectors.c

   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/system.h>
  29 #include <asm/traps.h>
  30
  31 /* assembler routines */
  32 asmlinkage void system_call(void);
  33 asmlinkage void buserr(void);
  34 asmlinkage void trap(void);
  35 asmlinkage void nmihandler(void);
  36 #ifdef CONFIG_M68KFPU_EMU
  37 asmlinkage void fpu_emu(void);
  38 #endif
  39
  40 e_vector vectors[256];
  41
  42 /* nmi handler for the Amiga */
  43 asm(".text\n"
  44     __ALIGN_STR "\n"
  45     "nmihandler: rte");
  46
  47 /*
  48  * this must be called very early as the kernel might
  49  * use some instruction that are emulated on the 060
  50  * and so we're prepared for early probe attempts (e.g. nf_init).
  51  */
  52 void __init base_trap_init(void)
  53 {
  54         if (MACH_IS_SUN3X) {
  55                 extern e_vector *sun3x_prom_vbr;
  56
  57                 __asm__ volatile ("movec %%vbr, %0" : "=r" (sun3x_prom_vbr));
  58         }
  59
  60         /* setup the exception vector table */
  61         __asm__ volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));
  62
  63         if (CPU_IS_060) {
  64                 /* set up ISP entry points */
  65                 asmlinkage void unimp_vec(void) asm ("_060_isp_unimp");
  66
  67                 vectors[VEC_UNIMPII] = unimp_vec;
  68         }
  69
  70         vectors[VEC_BUSERR] = buserr;
  71         vectors[VEC_ILLEGAL] = trap;
  72         vectors[VEC_SYS] = system_call;
  73 }
  74
  75 void __init trap_init (void)
  76 {
  77         int i;
  78
  79         for (i = VEC_SPUR; i <= VEC_INT7; i++)
  80                 vectors[i] = bad_inthandler;
  81
  82         for (i = 0; i < VEC_USER; i++)
  83                 if (!vectors[i])
  84                         vectors[i] = trap;
  85
  86         for (i = VEC_USER; i < 256; i++)
  87                 vectors[i] = bad_inthandler;
  88
  89 #ifdef CONFIG_M68KFPU_EMU
  90         if (FPU_IS_EMU)
  91                 vectors[VEC_LINE11] = fpu_emu;
  92 #endif
  93
  94         if (CPU_IS_040 && !FPU_IS_EMU) {
  95                 /* set up FPSP entry points */
  96                 asmlinkage void dz_vec(void) asm ("dz");
  97                 asmlinkage void inex_vec(void) asm ("inex");
  98                 asmlinkage void ovfl_vec(void) asm ("ovfl");
  99                 asmlinkage void unfl_vec(void) asm ("unfl");
 100                 asmlinkage void snan_vec(void) asm ("snan");
 101                 asmlinkage void operr_vec(void) asm ("operr");
 102                 asmlinkage void bsun_vec(void) asm ("bsun");
 103                 asmlinkage void fline_vec(void) asm ("fline");
 104                 asmlinkage void unsupp_vec(void) asm ("unsupp");
 105
 106                 vectors[VEC_FPDIVZ] = dz_vec;
 107                 vectors[VEC_FPIR] = inex_vec;
 108                 vectors[VEC_FPOVER] = ovfl_vec;
 109                 vectors[VEC_FPUNDER] = unfl_vec;
 110                 vectors[VEC_FPNAN] = snan_vec;
 111                 vectors[VEC_FPOE] = operr_vec;
 112                 vectors[VEC_FPBRUC] = bsun_vec;
 113                 vectors[VEC_LINE11] = fline_vec;
 114                 vectors[VEC_FPUNSUP] = unsupp_vec;
 115         }
 116
 117         if (CPU_IS_060 && !FPU_IS_EMU) {
 118                 /* set up IFPSP entry points */
 119                 asmlinkage void snan_vec6(void) asm ("_060_fpsp_snan");
 120                 asmlinkage void operr_vec6(void) asm ("_060_fpsp_operr");
 121                 asmlinkage void ovfl_vec6(void) asm ("_060_fpsp_ovfl");
 122                 asmlinkage void unfl_vec6(void) asm ("_060_fpsp_unfl");
 123                 asmlinkage void dz_vec6(void) asm ("_060_fpsp_dz");
 124                 asmlinkage void inex_vec6(void) asm ("_060_fpsp_inex");
 125                 asmlinkage void fline_vec6(void) asm ("_060_fpsp_fline");
 126                 asmlinkage void unsupp_vec6(void) asm ("_060_fpsp_unsupp");
 127                 asmlinkage void effadd_vec6(void) asm ("_060_fpsp_effadd");
 128
 129                 vectors[VEC_FPNAN] = snan_vec6;
 130                 vectors[VEC_FPOE] = operr_vec6;
 131                 vectors[VEC_FPOVER] = ovfl_vec6;
 132                 vectors[VEC_FPUNDER] = unfl_vec6;
 133                 vectors[VEC_FPDIVZ] = dz_vec6;
 134                 vectors[VEC_FPIR] = inex_vec6;
 135                 vectors[VEC_LINE11] = fline_vec6;
 136                 vectors[VEC_FPUNSUP] = unsupp_vec6;
 137                 vectors[VEC_UNIMPEA] = effadd_vec6;
 138         }
 139
 140         /* if running on an amiga, make the NMI interrupt do nothing */
 141         if (MACH_IS_AMIGA) {
 142                 vectors[VEC_INT7] = nmihandler;
 143         }
 144 }
 145