minix/kernel/arch/earm/arch_reset.c

   1 #include "kernel/kernel.h"
   2
   3 #include <unistd.h>
   4 #include <ctype.h>
   5 #include <string.h>
   6 #include <machine/cpu.h>
   7 #include <assert.h>
   8 #include <signal.h>
   9 #include <machine/vm.h>
  10 #include <io.h>
  11
  12 #include <minix/board.h>
  13 #include <sys/reboot.h>
  14
  15 #include <minix/u64.h>
  16
  17 #include "archconst.h"
  18 #include "arch_proto.h"
  19 #include "bsp_reset.h"
  20 #include "bsp_serial.h"
  21 #include "kernel/proc.h"
  22 #include "kernel/debug.h"
  23 #include "direct_utils.h"
  24 #include <machine/multiboot.h>
  25
  26 void
  27 halt_cpu(void)
  28 {
  29         asm volatile("dsb");
  30         asm volatile("cpsie i");
  31         asm volatile("wfi");
  32         asm volatile("cpsid i");
  33 }
  34
  35 void
  36 reset(void)
  37 {
  38         bsp_reset(); /* should not exit */
  39         direct_print("Reset not supported.");
  40         while (1);
  41 }
  42
  43 void
  44 poweroff(void)
  45 {
  46         bsp_poweroff();
  47         /* fallback option: hang */
  48         direct_print("Unable to power-off this device.");
  49         while (1);
  50 }
  51
  52 __dead void
  53 arch_shutdown(int how)
  54 {
  55
  56         if((how & RB_POWERDOWN) == RB_POWERDOWN) {
  57                 /* Power off if possible, hang otherwise */
  58                 poweroff();
  59                 NOT_REACHABLE;
  60         }
  61
  62         if(how & RB_HALT) {
  63                 /* Hang */
  64                 for (; ; ) halt_cpu();
  65                 NOT_REACHABLE;
  66         }
  67
  68         /* Reset the system */
  69         reset();
  70         NOT_REACHABLE;
  71
  72         while (1);
  73 }
  74
  75 #ifdef DEBUG_SERIAL
  76 void
  77 ser_putc(char c)
  78 {
  79         bsp_ser_putc(c);
  80 }
  81
  82 #endif