cpu/arm920t/interrupts.c

   1 /*
   2  * (C) Copyright 2002
   3  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4  * Marius Groeger <mgroeger@sysgo.de>
   5  *
   6  * (C) Copyright 2002
   7  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   8  * Alex Zuepke <azu@sysgo.de>
   9  *
  10  * (C) Copyright 2002
  11  * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
  12  *
  13  * See file CREDITS for list of people who contributed to this
  14  * project.
  15  *
  16  * This program is free software; you can redistribute it and/or
  17  * modify it under the terms of the GNU General Public License as
  18  * published by the Free Software Foundation; either version 2 of
  19  * the License, or (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  29  * MA 02111-1307 USA
  30  */
  31
  32 #include <common.h>
  33 #include <arm920t.h>
  34 #include <asm/proc-armv/ptrace.h>
  35
  36 #ifdef CONFIG_USE_IRQ
  37 /* enable IRQ interrupts */
  38 void enable_interrupts (void)
  39 {
  40         unsigned long temp;
  41         __asm__ __volatile__("mrs %0, cpsr\n"
  42                              "bic %0, %0, #0x80\n"
  43                              "msr cpsr_c, %0"
  44                              : "=r" (temp)
  45                              :
  46                              : "memory");
  47 }
  48
  49
  50 /*
  51  * disable IRQ/FIQ interrupts
  52  * returns true if interrupts had been enabled before we disabled them
  53  */
  54 int disable_interrupts (void)
  55 {
  56         unsigned long old,temp;
  57         __asm__ __volatile__("mrs %0, cpsr\n"
  58                              "orr %1, %0, #0xc0\n"
  59                              "msr cpsr_c, %1"
  60                              : "=r" (old), "=r" (temp)
  61                              :
  62                              : "memory");
  63         return (old & 0x80) == 0;
  64 }
  65 #else
  66 void enable_interrupts (void)
  67 {
  68         return;
  69 }
  70 int disable_interrupts (void)
  71 {
  72         return 0;
  73 }
  74 #endif
  75
  76
  77 void bad_mode (void)
  78 {
  79         panic ("Resetting CPU ...\n");
  80         reset_cpu (0);
  81 }
  82
  83 void show_regs (struct pt_regs *regs)
  84 {
  85         unsigned long flags;
  86         const char *processor_modes[] = {
  87         "USER_26",      "FIQ_26",       "IRQ_26",       "SVC_26",
  88         "UK4_26",       "UK5_26",       "UK6_26",       "UK7_26",
  89         "UK8_26",       "UK9_26",       "UK10_26",      "UK11_26",
  90         "UK12_26",      "UK13_26",      "UK14_26",      "UK15_26",
  91         "USER_32",      "FIQ_32",       "IRQ_32",       "SVC_32",
  92         "UK4_32",       "UK5_32",       "UK6_32",       "ABT_32",
  93         "UK8_32",       "UK9_32",       "UK10_32",      "UND_32",
  94         "UK12_32",      "UK13_32",      "UK14_32",      "SYS_32",
  95         };
  96
  97         flags = condition_codes (regs);
  98
  99         printf ("pc : [<%08lx>]    lr : [<%08lx>]\n"
 100                 "sp : %08lx  ip : %08lx  fp : %08lx\n",
 101                 instruction_pointer (regs),
 102                 regs->ARM_lr, regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
 103         printf ("r10: %08lx  r9 : %08lx  r8 : %08lx\n",
 104                 regs->ARM_r10, regs->ARM_r9, regs->ARM_r8);
 105         printf ("r7 : %08lx  r6 : %08lx  r5 : %08lx  r4 : %08lx\n",
 106                 regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4);
 107         printf ("r3 : %08lx  r2 : %08lx  r1 : %08lx  r0 : %08lx\n",
 108                 regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0);
 109         printf ("Flags: %c%c%c%c",
 110                 flags & CC_N_BIT ? 'N' : 'n',
 111                 flags & CC_Z_BIT ? 'Z' : 'z',
 112                 flags & CC_C_BIT ? 'C' : 'c', flags & CC_V_BIT ? 'V' : 'v');
 113         printf ("  IRQs %s  FIQs %s  Mode %s%s\n",
 114                 interrupts_enabled (regs) ? "on" : "off",
 115                 fast_interrupts_enabled (regs) ? "on" : "off",
 116                 processor_modes[processor_mode (regs)],
 117                 thumb_mode (regs) ? " (T)" : "");
 118 }
 119
 120 void do_undefined_instruction (struct pt_regs *pt_regs)
 121 {
 122         printf ("undefined instruction\n");
 123         show_regs (pt_regs);
 124         bad_mode ();
 125 }
 126
 127 void do_software_interrupt (struct pt_regs *pt_regs)
 128 {
 129         printf ("software interrupt\n");
 130         show_regs (pt_regs);
 131         bad_mode ();
 132 }
 133
 134 void do_prefetch_abort (struct pt_regs *pt_regs)
 135 {
 136         printf ("prefetch abort\n");
 137         show_regs (pt_regs);
 138         bad_mode ();
 139 }
 140
 141 void do_data_abort (struct pt_regs *pt_regs)
 142 {
 143         printf ("data abort\n");
 144         show_regs (pt_regs);
 145         bad_mode ();
 146 }
 147
 148 void do_not_used (struct pt_regs *pt_regs)
 149 {
 150         printf ("not used\n");
 151         show_regs (pt_regs);
 152         bad_mode ();
 153 }
 154
 155 void do_fiq (struct pt_regs *pt_regs)
 156 {
 157         printf ("fast interrupt request\n");
 158         show_regs (pt_regs);
 159         bad_mode ();
 160 }
 161
 162 void do_irq (struct pt_regs *pt_regs)
 163 {
 164 #if defined (CONFIG_USE_IRQ) && defined (CONFIG_ARCH_INTEGRATOR)
 165         /* ASSUMED to be a timer interrupt  */
 166         /* Just clear it - count handled in */
 167         /* integratorap.c                   */
 168         *(volatile ulong *)(CFG_TIMERBASE + 0x0C) = 0;
 169 #else
 170         printf ("interrupt request\n");
 171         show_regs (pt_regs);
 172         bad_mode ();
 173 #endif
 174 }