LXR linux/arch/xtensa/platforms/iss/setup.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *
   4 * arch/xtensa/platform-iss/setup.c
   5 *
   6 * Platform specific initialization.
   7 *
   8 * Authors: Chris Zankel <chris@zankel.net>
   9 *          Joe Taylor <joe@tensilica.com>
  10 *
  11 * Copyright 2001 - 2005 Tensilica Inc.
  12 * Copyright 2017 Cadence Design Systems Inc.
  13 */
  14#include <linux/init.h>
  15#include <linux/kernel.h>
  16#include <linux/notifier.h>
  17#include <linux/panic_notifier.h>
  18#include <linux/printk.h>
  19#include <linux/string.h>
  20
  21#include <asm/platform.h>
  22#include <asm/setup.h>
  23
  24#include <platform/simcall.h>
  25
  26
  27void platform_halt(void)
  28{
  29        pr_info(" ** Called platform_halt() **\n");
  30        simc_exit(0);
  31}
  32
  33void platform_power_off(void)
  34{
  35        pr_info(" ** Called platform_power_off() **\n");
  36        simc_exit(0);
  37}
  38
  39void platform_restart(void)
  40{
  41        /* Flush and reset the mmu, simulate a processor reset, and
  42         * jump to the reset vector. */
  43        cpu_reset();
  44        /* control never gets here */
  45}
  46
  47static int
  48iss_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
  49{
  50        simc_exit(1);
  51        return NOTIFY_DONE;
  52}
  53
  54static struct notifier_block iss_panic_block = {
  55        .notifier_call = iss_panic_event,
  56};
  57
  58void __init platform_setup(char **p_cmdline)
  59{
  60        static void *argv[COMMAND_LINE_SIZE / sizeof(void *)] __initdata;
  61        static char cmdline[COMMAND_LINE_SIZE] __initdata;
  62        int argc = simc_argc();
  63        int argv_size = simc_argv_size();
  64
  65        if (argc > 1) {
  66                if (argv_size > sizeof(argv)) {
  67                        pr_err("%s: command line too long: argv_size = %d\n",
  68                               __func__, argv_size);
  69                } else {
  70                        int i;
  71
  72                        cmdline[0] = 0;
  73                        simc_argv((void *)argv);
  74
  75                        for (i = 1; i < argc; ++i) {
  76                                if (i > 1)
  77                                        strcat(cmdline, " ");
  78                                strcat(cmdline, argv[i]);
  79                        }
  80                        *p_cmdline = cmdline;
  81                }
  82        }
  83
  84        atomic_notifier_chain_register(&panic_notifier_list, &iss_panic_block);
  85}
  86