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/*
* linux/arch/m32r/kernel/smpboot.c
* orig : i386 2.4.10
*
* M32R SMP booting functions
*
* Copyright (c) 2001, 2002, 2003 Hitoshi Yamamoto
*
* Taken from i386 version.
* (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
* (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
*
* Much of the core SMP work is based on previous work by Thomas Radke, to
* whom a great many thanks are extended.
*
* Thanks to Intel for making available several different Pentium,
* Pentium Pro and Pentium-II/Xeon MP machines.
* Original development of Linux SMP code supported by Caldera.
*
* This code is released under the GNU General Public License version 2 or
* later.
*
* Fixes
* Felix Koop : NR_CPUS used properly
* Jose Renau : Handle single CPU case.
* Alan Cox : By repeated request
* 8) - Total BogoMIP report.
* Greg Wright : Fix for kernel stacks panic.
* Erich Boleyn : MP v1.4 and additional changes.
* Matthias Sattler : Changes for 2.1 kernel map.
* Michel Lespinasse : Changes for 2.1 kernel map.
* Michael Chastain : Change trampoline.S to gnu as.
* Alan Cox : Dumb bug: 'B' step PPro's are fine
* Ingo Molnar : Added APIC timers, based on code
* from Jose Renau
* Ingo Molnar : various cleanups and rewrites
* Tigran Aivazian : fixed "0.00 in /proc/uptime on SMP" bug.
* Maciej W. Rozycki : Bits for genuine 82489DX APICs
* Martin J. Bligh : Added support for multi-quad systems
*/
#include <linux/module.h>
#include <linux/cpu.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/err.h>
#include <linux/irq.h>
#include <linux/bootmem.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#define DEBUG_SMP
#ifdef DEBUG_SMP
#define Dprintk(x...) printk(x)
#else
#define Dprintk(x...)
#endif
extern cpumask_t cpu_initialized;
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
/* Data structures and variables */
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
/* Processor that is doing the boot up */
static unsigned int bsp_phys_id = -1;
/* Bitmask of physically existing CPUs */
physid_mask_t phys_cpu_present_map;
cpumask_t cpu_bootout_map;
cpumask_t cpu_bootin_map;
static cpumask_t cpu_callin_map;
cpumask_t cpu_callout_map;
EXPORT_SYMBOL(cpu_callout_map);
/* Per CPU bogomips and other parameters */
struct cpuinfo_m32r cpu_data[NR_CPUS] __cacheline_aligned;
static int cpucount;
static cpumask_t smp_commenced_mask;
extern struct {
void * spi;
unsigned short ss;
} stack_start;
/* which physical physical ID maps to which logical CPU number */
static volatile int physid_2_cpu[NR_CPUS];
#define physid_to_cpu(physid) physid_2_cpu[physid]
/* which logical CPU number maps to which physical ID */
volatile int cpu_2_physid[NR_CPUS];
DEFINE_PER_CPU(int, prof_multiplier) = 1;
DEFINE_PER_CPU(int, prof_old_multiplier) = 1;
DEFINE_PER_CPU(int, prof_counter) = 1;
spinlock_t ipi_lock[NR_IPIS];
static unsigned int calibration_result;
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
/* Function Prototypes */
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
static void init_ipi_lock(void);
static void do_boot_cpu(int);
int start_secondary(void *);
static void smp_callin(void);
static void smp_online(void);
static void show_mp_info(int);
static void smp_store_cpu_info(int);
static void show_cpu_info(int);
int setup_profiling_timer(unsigned int);
static void init_cpu_to_physid(void);
static void map_cpu_to_physid(int, int);
static void unmap_cpu_to_physid(int, int);
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
/* Boot up APs Routines : BSP */
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
void __devinit smp_prepare_boot_cpu(void)
{
bsp_phys_id = hard_smp_processor_id();
physid_set(bsp_phys_id, phys_cpu_present_map);
set_cpu_online(0, true); /* BSP's cpu_id == 0 */
cpumask_set_cpu(0, &cpu_callout_map);
cpumask_set_cpu(0, &cpu_callin_map);
/*
* Initialize the logical to physical CPU number mapping
*/
init_cpu_to_physid();
map_cpu_to_physid(0, bsp_phys_id);
current_thread_info()->cpu = 0;
}
/*==========================================================================*
* Name: smp_prepare_cpus (old smp_boot_cpus)
*
* Description: This routine boot up APs.
*
* Born on Date: 2002.02.05
*
* Arguments: NONE
*
* Returns: void (cannot fail)
*
* Modification log:
* Date Who Description
* ---------- --- --------------------------------------------------------
* 2003-06-24 hy modify for linux-2.5.69
*
*==========================================================================*/
void __init smp_prepare_cpus(unsigned int max_cpus)
{
int phys_id;
unsigned long nr_cpu;
nr_cpu = inl(M32R_FPGA_NUM_OF_CPUS_PORTL);
if (nr_cpu > NR_CPUS) {
printk(KERN_INFO "NUM_OF_CPUS reg. value [%ld] > NR_CPU [%d]",
nr_cpu, NR_CPUS);
goto smp_done;
}
for (phys_id = 0 ; phys_id < nr_cpu ; phys_id++)
physid_set(phys_id, phys_cpu_present_map);
#ifndef CONFIG_HOTPLUG_CPU
init_cpu_present(cpu_possible_mask);
#endif
show_mp_info(nr_cpu);
init_ipi_lock();
/*
* Setup boot CPU information
*/
smp_store_cpu_info(0); /* Final full version of the data */
/*
* If SMP should be disabled, then really disable it!
*/
if (!max_cpus) {
printk(KERN_INFO "SMP mode deactivated by commandline.\n");
goto smp_done;
}
/*
* Now scan the CPU present map and fire up the other CPUs.
*/
Dprintk("CPU present map : %lx\n", physids_coerce(phys_cpu_present_map));
for (phys_id = 0 ; phys_id < NR_CPUS ; phys_id++) {
/*
* Don't even attempt to start the boot CPU!
*/
if (phys_id == bsp_phys_id)
continue;
if (!physid_isset(phys_id, phys_cpu_present_map))
continue;
if (max_cpus <= cpucount + 1)
continue;
do_boot_cpu(phys_id);
/*
* Make sure we unmap all failed CPUs
*/
if (physid_to_cpu(phys_id) == -1) {
physid_clear(phys_id, phys_cpu_present_map);
printk("phys CPU#%d not responding - " \
"cannot use it.\n", phys_id);
}
}
smp_done:
Dprintk("Boot done.\n");
}
/*
* init_ipi_lock : Initialize IPI locks.
*/
static void __init init_ipi_lock(void)
{
int ipi;
for (ipi = 0 ; ipi < NR_IPIS ; ipi++)
spin_lock_init(&ipi_lock[ipi]);
}
/*==========================================================================*
* Name: do_boot_cpu
*
* Description: This routine boot up one AP.
*
* Born on Date: 2002.02.05
*
* Arguments: phys_id - Target CPU physical ID
*
* Returns: void (cannot fail)
*
* Modification log:
* Date Who Description
* ---------- --- --------------------------------------------------------
* 2003-06-24 hy modify for linux-2.5.69
*
*==========================================================================*/
static void __init do_boot_cpu(int phys_id)
{
struct task_struct *idle;
unsigned long send_status, boot_status;
int timeout, cpu_id;
cpu_id = ++cpucount;
/*
* We can't use kernel_thread since we must avoid to
* reschedule the child.
*/
idle = fork_idle(cpu_id);
if (IS_ERR(idle))
panic("failed fork for CPU#%d.", cpu_id);
idle->thread.lr = (unsigned long)start_secondary;
map_cpu_to_physid(cpu_id, phys_id);
/* So we see what's up */
printk("Booting processor %d/%d\n", phys_id, cpu_id);
stack_start.spi = (void *)idle->thread.sp;
task_thread_info(idle)->cpu = cpu_id;
/*
* Send Startup IPI
* 1.IPI received by CPU#(phys_id).
* 2.CPU#(phys_id) enter startup_AP (arch/m32r/kernel/head.S)
* 3.CPU#(phys_id) enter start_secondary()
*/
send_status = 0;
boot_status = 0;
cpumask_set_cpu(phys_id, &cpu_bootout_map);
/* Send Startup IPI */
send_IPI_mask_phys(cpumask_of(phys_id), CPU_BOOT_IPI, 0);
Dprintk("Waiting for send to finish...\n");
timeout = 0;
/* Wait 100[ms] */
do {
Dprintk("+");
udelay(1000);
send_status = !cpumask_test_cpu(phys_id, &cpu_bootin_map);
} while (send_status && (timeout++ < 100));
Dprintk("After Startup.\n");
if (!send_status) {
/*
* allow APs to start initializing.
*/
Dprintk("Before Callout %d.\n", cpu_id);
cpumask_set_cpu(cpu_id, &cpu_callout_map);
Dprintk("After Callout %d.\n", cpu_id);
/*
* Wait 5s total for a response
*/
for (timeout = 0; timeout < 5000; tim
|