void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned int ncores = scu_get_core_count(scu_base);
unsigned int cpu = smp_processor_id();
int i;
smp_store_cpu_info(cpu);
/*
* are we trying to boot more cores than exist?
*/
if (max_cpus > ncores)
max_cpus = ncores;
/*
* Initialise the present map, which describes the set of CPUs
* actually populated at the present time.
*/
for (i = 0; i < max_cpus; i++)
set_cpu_present(i, true);
/*
* Initialise the SCU if there are more than one CPU and let
* them know where to start. Note that, on modern versions of
* MILO, the "poke" doesn't actually do anything until each
* individual core is sent a soft interrupt to get it out of
* WFI
*/
if (max_cpus > 1) {
percpu_timer_setup();
scu_enable(scu_base);
}
}
/*
* This is the secondary CPU boot entry. We're using this CPUs
* idle thread stack, but a set of temporary page tables.
*/
asmlinkage void __cpuinit secondary_start_kernel(void)
{
struct mm_struct *mm = &init_mm;
unsigned int cpu = smp_processor_id();
/*
* All kernel threads share the same mm context; grab a
* reference and switch to it.
*/
atomic_inc(&mm->mm_count);
current->active_mm = mm;
cpumask_set_cpu(cpu, mm_cpumask(mm));
set_my_cpu_offset(per_cpu_offset(smp_processor_id()));
printk("CPU%u: Booted secondary processor\n", cpu);
/*
* TTBR0 is only used for the identity mapping at this stage. Make it
* point to zero page to avoid speculatively fetching new entries.
*/
cpu_set_reserved_ttbr0();
flush_tlb_all();
preempt_disable();
trace_hardirqs_off();
if (cpu_ops[cpu]->cpu_postboot)
cpu_ops[cpu]->cpu_postboot();
/*
* Enable GIC and timers.
*/
smp_store_cpu_info(cpu);
notify_cpu_starting(cpu);
/*
* OK, now it's safe to let the boot CPU continue. Wait for
* the CPU migration code to notice that the CPU is online
* before we continue.
*/
set_cpu_online(cpu, true);
complete(&cpu_running);
local_dbg_enable();
/*
* Setup the percpu timer for this CPU.
*/
percpu_timer_setup();
local_irq_enable();
local_async_enable();
/*
* OK, it's off to the idle thread for us
*/
cpu_startup_entry(CPUHP_ONLINE);
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned int ncores = get_core_count();
unsigned int cpu = smp_processor_id();
int i;
/* sanity check */
if (ncores == 0) {
printk(KERN_ERR
"Realview: strange CM count of 0? Default to 1\n");
ncores = 1;
}
if (ncores > NR_CPUS) {
printk(KERN_WARNING
"Realview: no. of cores (%d) greater than configured "
"maximum of %d - clipping\n",
ncores, NR_CPUS);
ncores = NR_CPUS;
}
smp_store_cpu_info(cpu);
/*
* are we trying to boot more cores than exist?
*/
if (max_cpus > ncores)
max_cpus = ncores;
/*
* Initialise the present map, which describes the set of CPUs
* actually populated at the present time.
*/
for (i = 0; i < max_cpus; i++)
set_cpu_present(i, true);
/*
* Initialise the SCU if there are more than one CPU and let
* them know where to start. Note that, on modern versions of
* MILO, the "poke" doesn't actually do anything until each
* individual core is sent a soft interrupt to get it out of
* WFI
*/
if (max_cpus > 1) {
/*
* Enable the local timer or broadcast device for the
* boot CPU, but only if we have more than one CPU.
*/
percpu_timer_setup();
scu_enable(scu_base_addr());
poke_milo();
}
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned int ncores = get_core_count();
unsigned int cpu = smp_processor_id();
int i;
/* sanity check */
if (ncores == 0) {
printk(KERN_ERR
"OMAP4: strange core count of 0? Default to 1\n");
ncores = 1;
}
if (ncores > NR_CPUS) {
printk(KERN_WARNING
"OMAP4: no. of cores (%d) greater than configured "
"maximum of %d - clipping\n",
ncores, NR_CPUS);
ncores = NR_CPUS;
}
smp_store_cpu_info(cpu);
/*
* are we trying to boot more cores than exist?
*/
if (max_cpus > ncores)
max_cpus = ncores;
/*
* Initialise the present map, which describes the set of CPUs
* actually populated at the present time.
*/
for (i = 0; i < max_cpus; i++)
set_cpu_present(i, true);
if (max_cpus > 1) {
/*
* Enable the local timer or broadcast device for the
* boot CPU, but only if we have more than one CPU.
*/
percpu_timer_setup();
/*
* Initialise the SCU and wake up the secondary core using
* wakeup_secondary().
*/
scu_enable(scu_base);
wakeup_secondary();
}
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned int ncores = num_possible_cpus();
unsigned int cpu = smp_processor_id();
int i;
smp_store_cpu_info(cpu);
/*
* are we trying to boot more cores than exist?
*/
if (max_cpus > ncores)
max_cpus = ncores;
/*
* Initialise the present map, which describes the set of CPUs
* actually populated at the present time.
*/
for (i = 0; i < max_cpus; i++)
set_cpu_present(i, true);
/*
* Initialise the SCU if there are more than one CPU and let
* them know where to start.
*/
if (max_cpus > 1) {
/*
* Enable the local timer or broadcast device for the
* boot CPU, but only if we have more than one CPU.
*/
percpu_timer_setup();
scu_enable((void __iomem *)(PERI_ADDRESS(0x16000000))); // SCU PA = 0x16000000
/*
* Write the address of secondary startup into the
* system-wide flags register. The boot monitor waits
* until it receives a soft interrupt, and then the
* secondary CPU branches to this address.
*/
//printk("_Secondary_startup physical address = 0x%08x\n",BSYM(virt_to_phys(vexpress_secondary_startup)));
//writew((BSYM(virt_to_phys(vexpress_secondary_startup))>>16), SECOND_START_ADDR_HI);
writel(0xbabe, SECOND_MAGIC_NUMBER_ADRESS);
writel(BSYM(virt_to_phys(vexpress_secondary_startup)), SECOND_START_ADDR);
__cpuc_flush_kern_all();
}
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
int err;
unsigned int cpu, ncores = num_possible_cpus();
init_cpu_topology();
smp_store_cpu_info(smp_processor_id());
/*
* are we trying to boot more cores than exist?
*/
if (max_cpus > ncores)
max_cpus = ncores;
/* Don't bother if we're effectively UP */
if (max_cpus <= 1)
return;
/*
* Initialise the present map (which describes the set of CPUs
* actually populated at the present time) and release the
* secondaries from the bootloader.
*
* Make sure we online at most (max_cpus - 1) additional CPUs.
*/
max_cpus--;
for_each_possible_cpu(cpu) {
if (max_cpus == 0)
break;
if (cpu == smp_processor_id())
continue;
if (!cpu_ops[cpu])
continue;
err = cpu_ops[cpu]->cpu_prepare(cpu);
if (err)
continue;
set_cpu_present(cpu, true);
max_cpus--;
}
percpu_timer_setup();
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned int ncores = num_possible_cpus();
unsigned int cpu = smp_processor_id();
int i;
smp_store_cpu_info(cpu);
/* are we trying to boot more cores than exist? */
if (max_cpus > ncores)
max_cpus = ncores;
/*
* Initialise the present map, which describes the set of CPUs
* actually populated at the present time.
*/
for (i = 0; i < max_cpus; i++)
set_cpu_present(i, true);
/*
* Initialise the SCU if there are more than one CPU and let
* them know where to start.
*/
if (max_cpus > 1) {
/*
* Enable the local timer or broadcast device for the
* boot CPU, but only if we have more than one CPU.
*/
percpu_timer_setup();
scu_enable(scu_base_addr());
/*
* Write the address of secondary startup into the
* system-wide flags register. The boot monitor waits
* until it receives a soft interrupt, and then the
* secondary CPU branches to this address.
*/
__raw_writel(BSYM(virt_to_phys(s5pv310_secondary_startup)), S5P_VA_SYSRAM);
}
}
