arch/arc/cpu/arc700/interrupts.c

   1 /*
   2  * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <asm/arcregs.h>
   9 #include <asm/ptrace.h>
  10
  11 /* Bit values in STATUS32 */
  12 #define E1_MASK         (1 << 1)        /* Level 1 interrupts enable */
  13 #define E2_MASK         (1 << 2)        /* Level 2 interrupts enable */
  14
  15 int interrupt_init(void)
  16 {
  17         return 0;
  18 }
  19
  20 /*
  21  * returns true if interrupts had been enabled before we disabled them
  22  */
  23 int disable_interrupts(void)
  24 {
  25         int status = read_aux_reg(ARC_AUX_STATUS32);
  26         int state = (status & (E1_MASK | E2_MASK)) ? 1 : 0;
  27
  28         status &= ~(E1_MASK | E2_MASK);
  29         /* STATUS32 register is updated indirectly with "FLAG" instruction */
  30         __asm__("flag %0" : : "r" (status));
  31         return state;
  32 }
  33
  34 void enable_interrupts(void)
  35 {
  36         unsigned int status = read_aux_reg(ARC_AUX_STATUS32);
  37
  38         status |= E1_MASK | E2_MASK;
  39         /* STATUS32 register is updated indirectly with "FLAG" instruction */
  40         __asm__("flag %0" : : "r" (status));
  41 }
  42
  43 static void print_reg_file(long *reg_rev, int start_num)
  44 {
  45         unsigned int i;
  46
  47         /* Print 3 registers per line */
  48         for (i = start_num; i < start_num + 25; i++) {
  49                 printf("r%02u: 0x%08lx\t", i, (unsigned long)*reg_rev);
  50                 if (((i + 1) % 3) == 0)
  51                         printf("\n");
  52
  53                 /* Because pt_regs has registers reversed */
  54                 reg_rev--;
  55         }
  56
  57         /* Add new-line if none was inserted in the end of loop above */
  58         if (((i + 1) % 3) != 0)
  59                 printf("\n");
  60 }
  61
  62 void show_regs(struct pt_regs *regs)
  63 {
  64         printf("ECR:\t0x%08lx\n", regs->ecr);
  65         printf("RET:\t0x%08lx\nBLINK:\t0x%08lx\nSTAT32:\t0x%08lx\n",
  66                regs->ret, regs->blink, regs->status32);
  67         printf("GP: 0x%08lx\t r25: 0x%08lx\t\n", regs->r26, regs->r25);
  68         printf("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n", regs->bta,
  69                regs->sp, regs->fp);
  70         printf("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n", regs->lp_start,
  71                regs->lp_end, regs->lp_count);
  72
  73         print_reg_file(&(regs->r0), 0);
  74 }
  75
  76 void bad_mode(struct pt_regs *regs)
  77 {
  78         if (regs)
  79                 show_regs(regs);
  80
  81         panic("Resetting CPU ...\n");
  82 }
  83
  84 void do_memory_error(unsigned long address, struct pt_regs *regs)
  85 {
  86         printf("Memory error exception @ 0x%lx\n", address);
  87         bad_mode(regs);
  88 }
  89
  90 void do_instruction_error(unsigned long address, struct pt_regs *regs)
  91 {
  92         printf("Instruction error exception @ 0x%lx\n", address);
  93         bad_mode(regs);
  94 }
  95
  96 void do_machine_check_fault(unsigned long address, struct pt_regs *regs)
  97 {
  98         printf("Machine check exception @ 0x%lx\n", address);
  99         bad_mode(regs);
 100 }
 101
 102 void do_interrupt_handler(void)
 103 {
 104         printf("Interrupt fired\n");
 105         bad_mode(0);
 106 }
 107
 108 void do_itlb_miss(struct pt_regs *regs)
 109 {
 110         printf("I TLB miss exception\n");
 111         bad_mode(regs);
 112 }
 113
 114 void do_dtlb_miss(struct pt_regs *regs)
 115 {
 116         printf("D TLB miss exception\n");
 117         bad_mode(regs);
 118 }
 119
 120 void do_tlb_prot_violation(unsigned long address, struct pt_regs *regs)
 121 {
 122         printf("TLB protection violation or misaligned access @ 0x%lx\n",
 123                address);
 124         bad_mode(regs);
 125 }
 126
 127 void do_privilege_violation(struct pt_regs *regs)
 128 {
 129         printf("Privilege violation exception\n");
 130         bad_mode(regs);
 131 }
 132
 133 void do_trap(struct pt_regs *regs)
 134 {
 135         printf("Trap exception\n");
 136         bad_mode(regs);
 137 }
 138
 139 void do_extension(struct pt_regs *regs)
 140 {
 141         printf("Extension instruction exception\n");
 142         bad_mode(regs);
 143 }