cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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reset.c (1455B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *
      4 * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
      5 * Author: Fuxin Zhang, zhangfx@lemote.com
      6 * Copyright (C) 2009 Lemote, Inc.
      7 * Author: Zhangjin Wu, wuzhangjin@gmail.com
      8 */
      9#include <linux/init.h>
     10#include <linux/pm.h>
     11
     12#include <asm/idle.h>
     13#include <asm/reboot.h>
     14
     15#include <loongson.h>
     16
     17static inline void loongson_reboot(void)
     18{
     19#ifndef CONFIG_CPU_JUMP_WORKAROUNDS
     20	((void (*)(void))ioremap(LOONGSON_BOOT_BASE, 4)) ();
     21#else
     22	void (*func)(void);
     23
     24	func = (void *)ioremap(LOONGSON_BOOT_BASE, 4);
     25
     26	__asm__ __volatile__(
     27	"	.set	noat						\n"
     28	"	jr	%[func]						\n"
     29	"	.set	at						\n"
     30	: /* No outputs */
     31	: [func] "r" (func));
     32#endif
     33}
     34
     35static void loongson_restart(char *command)
     36{
     37	/* do preparation for reboot */
     38	mach_prepare_reboot();
     39
     40	/* reboot via jumping to boot base address */
     41	loongson_reboot();
     42}
     43
     44static void loongson_poweroff(void)
     45{
     46	mach_prepare_shutdown();
     47
     48	/*
     49	 * It needs a wait loop here, but mips/kernel/reset.c already calls
     50	 * a generic delay loop, machine_hang(), so simply return.
     51	 */
     52	return;
     53}
     54
     55static void loongson_halt(void)
     56{
     57	pr_notice("\n\n** You can safely turn off the power now **\n\n");
     58	while (1) {
     59		if (cpu_wait)
     60			cpu_wait();
     61	}
     62}
     63
     64static int __init mips_reboot_setup(void)
     65{
     66	_machine_restart = loongson_restart;
     67	_machine_halt = loongson_halt;
     68	pm_power_off = loongson_poweroff;
     69
     70	return 0;
     71}
     72
     73arch_initcall(mips_reboot_setup);