C++ pr_emerg函数代码示例

void dump_page_badflags(struct page *page, const char *reason,
		unsigned long badflags)
{
	pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
		  page, atomic_read(&page->_count), page_mapcount(page),
		  page->mapping, page->index);
	BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS);
	dump_flags(page->flags, pageflag_names, ARRAY_SIZE(pageflag_names));
	if (reason)
		pr_alert("page dumped because: %s\n", reason);
	if (page->flags & badflags) {
		pr_alert("bad because of flags:\n");
		dump_flags(page->flags & badflags,
				pageflag_names, ARRAY_SIZE(pageflag_names));
	}
#ifdef CONFIG_MEMCG
	if (page->mem_cgroup)
		pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
#endif
}

void arch_restart_cpu(u32 cpu)
{
	u32 timeout, val;

	val = readl(DBG_DSCR(cpu));
	val &= ~((0x1 << 14) | (0x1 << 13));
	writel(val, DBG_DSCR(cpu));

	/* Restart dest cpu */
	writel(0x2, DBG_DRCR(cpu));

	timeout = 10000;
	do {
		val = readl(DBG_DSCR(cpu));
		if (val & (0x1 << 1))
			break;
	} while (--timeout);

	if (!timeout)
		pr_emerg("Cannot restart cpu%d\n", cpu);
}

static void mx_reboot_internal(const char *cmd)
{
	local_irq_disable();

	if(cmd) {
		if (!strcmp(cmd, "charge"))
			__raw_writel(REBOOT_MODE_CHARGE, S5P_INFORM4);
		else if (!strcmp(cmd, "wipe"))
			__raw_writel(REBOOT_MODE_WIPE, S5P_INFORM4);
		else if (!strcmp(cmd, "upgrade"))
			__raw_writel(REBOOT_MODE_UPGRADE, S5P_INFORM4);
	}

	flush_cache_all();
	outer_flush_all();
	arch_reset(0, 0);

	pr_emerg("%s: waiting for reboot\n", __func__);
	while (1) arch_reset(0, 0);

}

int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
	enum emulation_result er;
	int r;

	er = kvmppc_emulate_loadstore(vcpu);
	switch (er) {
	case EMULATE_DONE:
		/* Future optimization: only reload non-volatiles if they were
		 * actually modified. */
		r = RESUME_GUEST_NV;
		break;
	case EMULATE_AGAIN:
		r = RESUME_GUEST;
		break;
	case EMULATE_DO_MMIO:
		run->exit_reason = KVM_EXIT_MMIO;
		/* We must reload nonvolatiles because "update" load/store
		 * instructions modify register state. */
		/* Future optimization: only reload non-volatiles if they were
		 * actually modified. */
		r = RESUME_HOST_NV;
		break;
	case EMULATE_FAIL:
	{
		u32 last_inst;

		kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst);
		/* XXX Deliver Program interrupt to guest. */
		pr_emerg("%s: emulation failed (%08x)\n", __func__, last_inst);
		r = RESUME_HOST;
		break;
	}
	default:
		WARN_ON(1);
		r = RESUME_GUEST;
	}

	return r;
}

void arch_restart_cpu(u32 cpu)
{
	u32 timeout, val;
	void __iomem *p_dbg_base = DBG_BASE(cpu);
	void __iomem *p_cti_base = CTI_BASE(cpu);

	/* Disable Halt Debug Mode */
	val = readl(p_dbg_base + EDSCR);
	val &= ~(0x1 << 14);
	writel(val, p_dbg_base + EDSCR);

	/* Enable CTI access */
	cti_enable_access(cpu);

	/* Enable CTI */
	writel(0x1, p_cti_base + CTI_CTRL);

	/* ACK the outut event */
	writel(0x1, p_cti_base + CTI_INTACK);

	/* Set output channel1 */
	val = readl(p_cti_base + CTI_OUT1EN) | 0x2;
	writel(val, p_cti_base + CTI_OUT1EN);

	/* Trigger pulse event */
	writel(0x2, p_cti_base + CTI_APP_PULSE);

	/* Wait the cpu become running */
	timeout = 10000;
	do {
		val = readl(p_dbg_base + EDPRSR);
		if (!(val & (0x1 << 4)))
			break;
	} while (--timeout);

	if (!timeout)
		pr_emerg("Cannot restart cpu%d\n", cpu);
}

/*
 * Handle hardware error interrupts.
 *
 * RTAS check-exception is called to collect data on the exception.  If
 * the error is deemed recoverable, we log a warning and return.
 * For nonrecoverable errors, an error is logged and we stop all processing
 * as quickly as possible in order to prevent propagation of the failure.
 */
static irqreturn_t ras_error_interrupt(int irq, void *dev_id)
{
	struct rtas_error_log *rtas_elog;
	int status;
	int fatal;

	spin_lock(&ras_log_buf_lock);

	status = rtas_call(ras_check_exception_token, 6, 1, NULL,
			   RTAS_VECTOR_EXTERNAL_INTERRUPT,
			   virq_to_hw(irq),
			   RTAS_INTERNAL_ERROR, 1 /* Time Critical */,
			   __pa(&ras_log_buf),
				rtas_get_error_log_max());

	rtas_elog = (struct rtas_error_log *)ras_log_buf;

	if (status == 0 &&
	    rtas_error_severity(rtas_elog) >= RTAS_SEVERITY_ERROR_SYNC)
		fatal = 1;
	else
		fatal = 0;

	/* format and print the extended information */
	log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, fatal);

	if (fatal) {
		pr_emerg("Fatal hardware error detected. Check RTAS error"
			 " log for details. Powering off immediately\n");
		emergency_sync();
		kernel_power_off();
	} else {
		pr_err("Recoverable hardware error detected\n");
	}

	spin_unlock(&ras_log_buf_lock);
	return IRQ_HANDLED;
}

static void s5m_rtc_shutdown(struct platform_device *pdev)
{
	struct s5m_rtc_info *info = platform_get_drvdata(pdev);
	int i;
	unsigned int val = 0;
	if (info->wtsr_smpl) {
		for (i = 0; i < 3; i++) {
			s5m_rtc_enable_wtsr(info, false);
			regmap_read(info->rtc, SEC_WTSR_SMPL_CNTL, &val);
			pr_debug("%s: WTSR_SMPL reg(0x%02x)\n", __func__, val);
			if (val & WTSR_ENABLE_MASK)
				pr_emerg("%s: fail to disable WTSR\n",
					 __func__);
			else {
				pr_info("%s: success to disable WTSR\n",
					__func__);
				break;
			}
		}
	}
	/* Disable SMPL when power off */
	s5m_rtc_enable_smpl(info, false);
}

/*
 * adds a new device and register it with virtio
 * appropriate drivers are loaded by the device model
 */
static void add_kvm_device(struct kvm_device_desc *d, unsigned int offset)
{
	struct kvm_device *kdev;

	kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
	if (!kdev) {
		pr_emerg("Cannot allocate kvm dev %u type %u\n",
			 offset, d->type);
		return;
	}

	kdev->vdev.dev.parent = kvm_root;
	kdev->vdev.id.device = d->type;
	kdev->vdev.config = &kvm_vq_config_ops;
	kdev->desc = d;
	kdev->desc_pa = PFN_PHYS(max_pfn) + offset;

	if (register_virtio_device(&kdev->vdev) != 0) {
		pr_err("Failed to register kvm device %u type %u\n",
		       offset, d->type);
		kfree(kdev);
	}
}

static void __init xilinx_timer_init(struct device_node *timer)
{
	u32 irq;
	u32 timer_num = 1;
	int ret;

	timer_baseaddr = of_iomap(timer, 0);
	if (!timer_baseaddr) {
		pr_err("ERROR: invalid timer base address\n");
		BUG();
	}

	irq = irq_of_parse_and_map(timer, 0);

	of_property_read_u32(timer, "xlnx,one-timer-only", &timer_num);
	if (timer_num) {
		pr_emerg("Please enable two timers in HW\n");
		BUG();
	}

	pr_info("%s: irq=%d\n", timer->full_name, irq);

	/* If there is clock-frequency property than use it */
	ret = of_property_read_u32(timer, "clock-frequency", &timer_clock_freq);
	if (ret < 0)
		timer_clock_freq = cpuinfo.cpu_clock_freq;

	freq_div_hz = timer_clock_freq / HZ;

	setup_irq(irq, &timer_irqaction);
#ifdef CONFIG_HEART_BEAT
	setup_heartbeat();
#endif
	xilinx_clocksource_init();
	xilinx_clockevent_init();
	timer_initialized = 1;
}

static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
{
	struct stackframe frame;

	pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);

	if (!tsk)
		tsk = current;

	if (regs) {
		frame.fp = regs->regs[29];
		frame.sp = regs->sp;
		frame.pc = regs->pc;
	} else if (tsk == current) {
		frame.fp = (unsigned long)__builtin_frame_address(0);
		frame.sp = current_stack_pointer;
		frame.pc = (unsigned long)dump_backtrace;
	} else {
		/*
		 * task blocked in __switch_to
		 */
		frame.fp = thread_saved_fp(tsk);
		frame.sp = thread_saved_sp(tsk);
		frame.pc = thread_saved_pc(tsk);
	}

	pr_emerg("Call trace:\n");
	while (1) {
		unsigned long where = frame.pc;
		int ret;

		ret = unwind_frame(&frame);
		if (ret < 0)
			break;
		dump_backtrace_entry(where, frame.sp);
	}
}

static int dump_cpu_hwcaps(struct notifier_block *self, unsigned long v, void *p)
{
	/* file-wide pr_fmt adds "CPU features: " prefix */
	pr_emerg("0x%*pb\n", ARM64_NCAPS, &cpu_hwcaps);
	return 0;
}

/**
 *	panic - halt the system
 *	@fmt: The text string to print
 *
 *	Display a message, then perform cleanups.
 *
 *	This function never returns.
 */
void panic(const char *fmt, ...)
{
	static char buf[1024];
	va_list args;
	long i, i_next = 0, len;
	int state = 0;
	int old_cpu, this_cpu;
	bool _crash_kexec_post_notifiers = crash_kexec_post_notifiers;

	/*
	 * Disable local interrupts. This will prevent panic_smp_self_stop
	 * from deadlocking the first cpu that invokes the panic, since
	 * there is nothing to prevent an interrupt handler (that runs
	 * after setting panic_cpu) from invoking panic() again.
	 */
	local_irq_disable();

	/*
	 * It's possible to come here directly from a panic-assertion and
	 * not have preempt disabled. Some functions called from here want
	 * preempt to be disabled. No point enabling it later though...
	 *
	 * Only one CPU is allowed to execute the panic code from here. For
	 * multiple parallel invocations of panic, all other CPUs either
	 * stop themself or will wait until they are stopped by the 1st CPU
	 * with smp_send_stop().
	 *
	 * `old_cpu == PANIC_CPU_INVALID' means this is the 1st CPU which
	 * comes here, so go ahead.
	 * `old_cpu == this_cpu' means we came from nmi_panic() which sets
	 * panic_cpu to this CPU.  In this case, this is also the 1st CPU.
	 */
	this_cpu = raw_smp_processor_id();
	old_cpu  = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, this_cpu);

	if (old_cpu != PANIC_CPU_INVALID && old_cpu != this_cpu)
		panic_smp_self_stop();

	console_verbose();
	bust_spinlocks(1);
	va_start(args, fmt);
	len = vscnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);

	if (len && buf[len - 1] == '\n')
		buf[len - 1] = '\0';

	pr_emerg("Kernel panic - not syncing: %s\n", buf);
#ifdef CONFIG_DEBUG_BUGVERBOSE
	/*
	 * Avoid nested stack-dumping if a panic occurs during oops processing
	 */
	if (!test_taint(TAINT_DIE) && oops_in_progress <= 1)
		dump_stack();
#endif

	/*
	 * If we have crashed and we have a crash kernel loaded let it handle
	 * everything else.
	 * If we want to run this after calling panic_notifiers, pass
	 * the "crash_kexec_post_notifiers" option to the kernel.
	 *
	 * Bypass the panic_cpu check and call __crash_kexec directly.
	 */
	if (!_crash_kexec_post_notifiers) {
		printk_safe_flush_on_panic();
		__crash_kexec(NULL);

		/*
		 * Note smp_send_stop is the usual smp shutdown function, which
		 * unfortunately means it may not be hardened to work in a
		 * panic situation.
		 */
		smp_send_stop();
	} else {
		/*
		 * If we want to do crash dump after notifier calls and
		 * kmsg_dump, we will need architecture dependent extra
		 * works in addition to stopping other CPUs.
		 */
		crash_smp_send_stop();
	}

	/*
	 * Run any panic handlers, including those that might need to
	 * add information to the kmsg dump output.
	 */
	atomic_notifier_call_chain(&panic_notifier_list, 0, buf);

	/* Call flush even twice. It tries harder with a single online CPU */
	printk_safe_flush_on_panic();
	kmsg_dump(KMSG_DUMP_PANIC);
//.........这里部分代码省略.........

int mpi_set_buffer(MPI a, const void *xbuffer, unsigned nbytes, int sign)
{
	const uint8_t *buffer = xbuffer, *p;
	mpi_limb_t alimb;
	int nlimbs;
	int i;

	nlimbs = (nbytes + BYTES_PER_MPI_LIMB - 1) / BYTES_PER_MPI_LIMB;
	if (RESIZE_IF_NEEDED(a, nlimbs) < 0)
		return -ENOMEM;
	a->sign = sign;

	for (i = 0, p = buffer + nbytes - 1; p >= buffer + BYTES_PER_MPI_LIMB;) {
#if BYTES_PER_MPI_LIMB == 4
		alimb = (mpi_limb_t) *p--;
		alimb |= (mpi_limb_t) *p-- << 8;
		alimb |= (mpi_limb_t) *p-- << 16;
		alimb |= (mpi_limb_t) *p-- << 24;
#elif BYTES_PER_MPI_LIMB == 8
		alimb = (mpi_limb_t) *p--;
		alimb |= (mpi_limb_t) *p-- << 8;
		alimb |= (mpi_limb_t) *p-- << 16;
		alimb |= (mpi_limb_t) *p-- << 24;
		alimb |= (mpi_limb_t) *p-- << 32;
		alimb |= (mpi_limb_t) *p-- << 40;
		alimb |= (mpi_limb_t) *p-- << 48;
		alimb |= (mpi_limb_t) *p-- << 56;
#else
#error please implement for this limb size.
#endif
		a->d[i++] = alimb;
	}
	if (p >= buffer) {
#if BYTES_PER_MPI_LIMB == 4
		alimb = *p--;
		if (p >= buffer)
			alimb |= (mpi_limb_t) *p-- << 8;
		if (p >= buffer)
			alimb |= (mpi_limb_t) *p-- << 16;
		if (p >= buffer)
			alimb |= (mpi_limb_t) *p-- << 24;
#elif BYTES_PER_MPI_LIMB == 8
		alimb = (mpi_limb_t) *p--;
		if (p >= buffer)
			alimb |= (mpi_limb_t) *p-- << 8;
		if (p >= buffer)
			alimb |= (mpi_limb_t) *p-- << 16;
		if (p >= buffer)
			alimb |= (mpi_limb_t) *p-- << 24;
		if (p >= buffer)
			alimb |= (mpi_limb_t) *p-- << 32;
		if (p >= buffer)
			alimb |= (mpi_limb_t) *p-- << 40;
		if (p >= buffer)
			alimb |= (mpi_limb_t) *p-- << 48;
		if (p >= buffer)
			alimb |= (mpi_limb_t) *p-- << 56;
#else
#error please implement for this limb size.
#endif
		a->d[i++] = alimb;
	}
	a->nlimbs = i;

	if (i != nlimbs) {
		pr_emerg("MPI: mpi_set_buffer: Assertion failed (%d != %d)", i,
		       nlimbs);
		BUG();
	}
	return 0;
}

/*
 * Check if the die sensor is cooling down. If it's higher than
 * t_hot since the last throttle then throttle it again.
 * OMAP junction temperature could stay for a long time in an
 * unacceptable temperature range. The idea here is to check after
 * t_hot->throttle the system really came below t_hot else re-throttle
 * and keep doing till it's under t_hot temp range.
 */
static void throttle_delayed_work_fn(struct work_struct *work)
{
	int curr;
	struct omap_temp_sensor *temp_sensor =
				container_of(work, struct omap_temp_sensor,
					     throttle_work.work);
	curr = omap_read_current_temp(temp_sensor);

#ifdef CONFIG_OMAP_TEMP_CONTROL
	if (curr >= temp_limit || curr < 0) {
#else
	if (curr >= BGAP_THRESHOLD_T_HOT || curr < 0) {
#endif
		pr_warn("%s: OMAP temp read %d exceeds the threshold\n",
			__func__, curr);
		omap_thermal_throttle();
		schedule_delayed_work(&temp_sensor->throttle_work,
			msecs_to_jiffies(THROTTLE_DELAY_MS));
	} else {
		schedule_delayed_work(&temp_sensor->throttle_work,
			msecs_to_jiffies(THROTTLE_DELAY_MS));
	}
}

static irqreturn_t omap_tshut_irq_handler(int irq, void *data)
{
	struct omap_temp_sensor *temp_sensor = (struct omap_temp_sensor *)data;

	/* Need to handle thermal mgmt in bootloader
	 * to avoid restart again at kernel level
	 */
	if (temp_sensor->is_efuse_valid) {
		pr_emerg("%s: Thermal shutdown reached rebooting device\n",
			__func__);
		kernel_restart(NULL);
	} else {
		pr_err("%s:Invalid EFUSE, Non-trimmed BGAP\n", __func__);
	}

	return IRQ_HANDLED;
}

static irqreturn_t omap_talert_irq_handler(int irq, void *data)
{
	struct omap_temp_sensor *temp_sensor = (struct omap_temp_sensor *)data;
	int t_hot, t_cold, temp_offset;

	t_hot = omap_temp_sensor_readl(temp_sensor, BGAP_STATUS_OFFSET)
	    & OMAP4_HOT_FLAG_MASK;
	t_cold = omap_temp_sensor_readl(temp_sensor, BGAP_STATUS_OFFSET)
	    & OMAP4_COLD_FLAG_MASK;
	temp_offset = omap_temp_sensor_readl(temp_sensor, BGAP_CTRL_OFFSET);
	if (t_hot) {
		omap_thermal_throttle();
		schedule_delayed_work(&temp_sensor->throttle_work,
			msecs_to_jiffies(THROTTLE_DELAY_MS));
		temp_offset &= ~(OMAP4_MASK_HOT_MASK);
		temp_offset |= OMAP4_MASK_COLD_MASK;
	} else if (t_cold) {
		cancel_delayed_work_sync(&temp_sensor->throttle_work);
		omap_thermal_unthrottle();
		temp_offset &= ~(OMAP4_MASK_COLD_MASK);
		temp_offset |= OMAP4_MASK_HOT_MASK;
	}

	omap_temp_sensor_writel(temp_sensor, temp_offset, BGAP_CTRL_OFFSET);

	return IRQ_HANDLED;
}

static int __devinit omap_temp_sensor_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct omap_temp_sensor_pdata *pdata = pdev->dev.platform_data;
	struct omap_temp_sensor *temp_sensor;
	struct resource *mem;
	int ret = 0, val;

	if (!pdata) {
		dev_err(dev, "%s: platform data missing\n", __func__);
		return -EINVAL;
	}

	temp_sensor = kzalloc(sizeof(struct omap_temp_sensor), GFP_KERNEL);
	if (!temp_sensor)
		return -ENOMEM;

	spin_lock_init(&temp_sensor->lock);

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
		dev_err(dev, "%s:no mem resource\n", __func__);
//.........这里部分代码省略.........

/**
 * omap_fatal_zone() -	Shut-down the system to ensure OMAP Junction
 *			Temperature decreases enough
 *
 * @cpu_temp:	The current adjusted CPU temperature
 *
 * No return forces a restart of the system
 */
static void omap_fatal_zone(int cpu_temp)
{
	pr_emerg("%s:FATAL ZONE (hot spot temp: %i)\n", __func__, cpu_temp);

	kernel_restart(NULL);
}