C++ cpu_logical_map函数代码示例

static int __cpuinit psci_boot_secondary(unsigned int cpu,
					 struct task_struct *idle)
{
	if (psci_ops.cpu_on)
		return psci_ops.cpu_on(cpu_logical_map(cpu),
				       __pa(secondary_startup));
	return -ENODEV;
}

static int octeon_coreid_for_cpu(int cpu)
{
#ifdef CONFIG_SMP
	return cpu_logical_map(cpu);
#else
	return cvmx_get_core_num();
#endif
}

int hs_get_cpu_jump(int cpu)
{
	int offset = hs_smp_reg;

	cpu = cpu_logical_map(cpu);
	if (cpu > 0)
		offset +=  0x04 * (cpu - 1);
	return readl_relaxed(hs_sctrl_base + offset);
}

void hs_set_cpu_jump(int cpu, void *jump_addr)
{
	int offset = hs_smp_reg;

	cpu = cpu_logical_map(cpu);
	if (cpu > 0)
		offset +=  0x04 * (cpu - 1);
	writel_relaxed(virt_to_phys(jump_addr), hs_sctrl_base + offset);
}

/*
 * Duplicate MPIDRs are a recipe for disaster. Scan all initialized
 * entries and check for duplicates. If any is found just ignore the
 * cpu. cpu_logical_map was initialized to INVALID_HWID to avoid
 * matching valid MPIDR values.
 */
static bool __init is_mpidr_duplicate(unsigned int cpu, u64 hwid)
{
	unsigned int i;

	for (i = 1; (i < cpu) && (i < NR_CPUS); i++)
		if (cpu_logical_map(i) == hwid)
			return true;
	return false;
}

/**
 * Cause the function described by call_data to be executed on the passed
 * cpu.	 When the function has finished, increment the finished field of
 * call_data.
 */
void octeon_send_ipi_single(int cpu, unsigned int action)
{
	int coreid = cpu_logical_map(cpu);
	/*
	pr_info("SMP: Mailbox send cpu=%d, coreid=%d, action=%u\n", cpu,
	       coreid, action);
	*/
	cvmx_write_csr(CVMX_CIU_MBOX_SETX(coreid), action);
}

void __init
smp_clear_cpu_maps (void)
{
    cpumask_clear(&cpu_possible_map);
    cpumask_clear(&cpu_online_map);
    cpumask_set_cpu(0, &cpu_online_map);
    cpumask_set_cpu(0, &cpu_possible_map);
    cpu_logical_map(0) = READ_SYSREG(MPIDR_EL1) & MPIDR_HWID_MASK;
}

void nlm_send_ipi_single(int logical_cpu, unsigned int action)
{
	int cpu = cpu_logical_map(logical_cpu);

	if (action & SMP_CALL_FUNCTION)
		nlm_pic_send_ipi(nlm_pic_base, cpu, IRQ_IPI_SMP_FUNCTION, 0);
	if (action & SMP_RESCHEDULE_YOURSELF)
		nlm_pic_send_ipi(nlm_pic_base, cpu, IRQ_IPI_SMP_RESCHEDULE, 0);
}

static void cpu_to_pcpu(unsigned int cpu,
			unsigned int *pcpu, unsigned int *pcluster)
{
	unsigned int mpidr;

	mpidr = cpu_logical_map(cpu);
	*pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
	*pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
}

static void __init emev2_smp_prepare_cpus(unsigned int max_cpus)
{
	int cpu = cpu_logical_map(0);

	scu_enable(scu_base);

	/* enable cache coherency on CPU0 */
	modify_scu_cpu_psr(0, 3 << (cpu * 8));
}

int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
{
	int ret;
	int flag = 0;
	unsigned long timeout;

	pr_debug("Starting secondary CPU %d\n", cpu);

	
	preset_lpj = loops_per_jiffy;

	if (cpu > 0 && cpu < ARRAY_SIZE(cold_boot_flags))
		flag = cold_boot_flags[cpu];
	else
		__WARN();

	if (per_cpu(cold_boot_done, cpu) == false) {
		init_cpu_debug_counter_for_cold_boot();
		ret = scm_set_boot_addr((void *)
					virt_to_phys(msm_secondary_startup),
					flag);
		if (ret == 0)
			release_secondary(cpu);
		else
			printk(KERN_DEBUG "Failed to set secondary core boot "
					  "address\n");
		per_cpu(cold_boot_done, cpu) = true;
	}

	spin_lock(&boot_lock);

	/*
	 * The secondary processor is waiting to be released from
	 * the holding pen - release it, then wait for it to flag
	 * that it has been released by resetting pen_release.
	 *
	 * Note that "pen_release" is the hardware CPU ID, whereas
	 * "cpu" is Linux's internal ID.
	 */
	write_pen_release(cpu_logical_map(cpu));

	gic_raise_softirq(cpumask_of(cpu), 1);

	timeout = jiffies + (1 * HZ);
	while (time_before(jiffies, timeout)) {
		smp_rmb();
		if (pen_release == -1)
			break;

		udelay(10);
	}

	spin_unlock(&boot_lock);

	return pen_release != -1 ? -ENOSYS : 0;
}

void imx_enable_cpu(int cpu, bool enable)
{
	u32 mask, val;

	cpu = cpu_logical_map(cpu);
	mask = 1 << (BP_SRC_SCR_CORE1_ENABLE + cpu - 1);
	val = readl_relaxed(src_base + SRC_SCR);
	val = enable ? val | mask : val & ~mask;
	writel_relaxed(val, src_base + SRC_SCR);
}

int tegra_cpu_kill(unsigned int cpu)
{
	cpu = cpu_logical_map(cpu);

	tegra_wait_cpu_in_reset(cpu);

	tegra_disable_cpu_clock(cpu);

	return 1;
}

int tegra_cpu_kill(unsigned cpu)
{
	cpu = cpu_logical_map(cpu);

	/* Clock gate the CPU */
	tegra_wait_cpu_in_reset(cpu);
	tegra_disable_cpu_clock(cpu);

	return 1;
}

static inline void unmask_loongson_irq(struct irq_data *d)
{
	/* Workaround: UART IRQ may deliver to any core */
	if (d->irq == LOONGSON_UART_IRQ) {
		int cpu = smp_processor_id();
		int node_id = cpu_logical_map(cpu) / loongson_sysconf.cores_per_node;
		int core_id = cpu_logical_map(cpu) % loongson_sysconf.cores_per_node;
		u64 intenset_addr = smp_group[node_id] |
			(u64)(&LOONGSON_INT_ROUTER_INTENSET);
		u64 introuter_lpc_addr = smp_group[node_id] |
			(u64)(&LOONGSON_INT_ROUTER_LPC);

		*(volatile u32 *)intenset_addr = 1 << 10;
		*(volatile u8 *)introuter_lpc_addr = 0x10 + (1<<core_id);
	}

	set_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE));
	irq_enable_hazard();
}