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sun4d_smp.c

/* sun4d_smp.c: Sparc SS1000/SC2000 SMP support.
 *
 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 *
 * Based on sun4m's smp.c, which is:
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 */

#include <asm/head.h>

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/threads.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/profile.h>
#include <linux/delay.h>

#include <asm/ptrace.h>
#include <asm/atomic.h>
#include <asm/irq_regs.h>

#include <asm/irq.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/oplib.h>
#include <asm/sbus.h>
#include <asm/sbi.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
#include <asm/cpudata.h>

#include "irq.h"
#define IRQ_CROSS_CALL        15

extern ctxd_t *srmmu_ctx_table_phys;

static volatile int smp_processors_ready = 0;
static int smp_highest_cpu;
extern volatile unsigned long cpu_callin_map[NR_CPUS];
extern cpuinfo_sparc cpu_data[NR_CPUS];
extern unsigned char boot_cpu_id;
extern volatile int smp_process_available;

extern cpumask_t smp_commenced_mask;

extern int __smp4d_processor_id(void);

/* #define SMP_DEBUG */

#ifdef SMP_DEBUG
#define SMP_PRINTK(x)   printk x
#else
#define SMP_PRINTK(x)
#endif

static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)
{
      __asm__ __volatile__("swap [%1], %0\n\t" :
                       "=&r" (val), "=&r" (ptr) :
                       "0" (val), "1" (ptr));
      return val;
}

static void smp_setup_percpu_timer(void);
extern void cpu_probe(void);
extern void sun4d_distribute_irqs(void);

void __init smp4d_callin(void)
{
      int cpuid = hard_smp4d_processor_id();
      extern spinlock_t sun4d_imsk_lock;
      unsigned long flags;
      
      /* Show we are alive */
      cpu_leds[cpuid] = 0x6;
      show_leds(cpuid);

      /* Enable level15 interrupt, disable level14 interrupt for now */
      cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000);

      local_flush_cache_all();
      local_flush_tlb_all();

      /*
       * Unblock the master CPU _only_ when the scheduler state
       * of all secondary CPUs will be up-to-date, so after
       * the SMP initialization the master will be just allowed
       * to call the scheduler code.
       */
      /* Get our local ticker going. */
      smp_setup_percpu_timer();

      calibrate_delay();
      smp_store_cpu_info(cpuid);
      local_flush_cache_all();
      local_flush_tlb_all();

      /* Allow master to continue. */
      swap((unsigned long *)&cpu_callin_map[cpuid], 1);
      local_flush_cache_all();
      local_flush_tlb_all();
      
      cpu_probe();

      while((unsigned long)current_set[cpuid] < PAGE_OFFSET)
            barrier();
            
      while(current_set[cpuid]->cpu != cpuid)
            barrier();
            
      /* Fix idle thread fields. */
      __asm__ __volatile__("ld [%0], %%g6\n\t"
                       : : "r" (&current_set[cpuid])
                       : "memory" /* paranoid */);

      cpu_leds[cpuid] = 0x9;
      show_leds(cpuid);
      
      /* Attach to the address space of init_task. */
      atomic_inc(&init_mm.mm_count);
      current->active_mm = &init_mm;

      local_flush_cache_all();
      local_flush_tlb_all();
      
      local_irq_enable();     /* We don't allow PIL 14 yet */
      
      while (!cpu_isset(cpuid, smp_commenced_mask))
            barrier();

      spin_lock_irqsave(&sun4d_imsk_lock, flags);
      cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */
      spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
      cpu_set(cpuid, cpu_online_map);

}

extern void init_IRQ(void);
extern void cpu_panic(void);

/*
 *    Cycle through the processors asking the PROM to start each one.
 */
 
extern struct linux_prom_registers smp_penguin_ctable;
extern unsigned long trapbase_cpu1[];
extern unsigned long trapbase_cpu2[];
extern unsigned long trapbase_cpu3[];

void __init smp4d_boot_cpus(void)
{
      if (boot_cpu_id)
            current_set[0] = NULL;
      smp_setup_percpu_timer();
      local_flush_cache_all();
}

int __cpuinit smp4d_boot_one_cpu(int i)
{
                  extern unsigned long sun4d_cpu_startup;
                  unsigned long *entry = &sun4d_cpu_startup;
                  struct task_struct *p;
                  int timeout;
                  int cpu_node;

                  cpu_find_by_instance(i, &cpu_node,NULL);
                  /* Cook up an idler for this guy. */
                  p = fork_idle(i);
                  current_set[i] = task_thread_info(p);

                  /*
                   * Initialize the contexts table
                   * Since the call to prom_startcpu() trashes the structure,
                   * we need to re-initialize it for each cpu
                   */
                  smp_penguin_ctable.which_io = 0;
                  smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
                  smp_penguin_ctable.reg_size = 0;

                  /* whirrr, whirrr, whirrrrrrrrr... */
                  SMP_PRINTK(("Starting CPU %d at %p \n", i, entry));
                  local_flush_cache_all();
                  prom_startcpu(cpu_node,
                              &smp_penguin_ctable, 0, (char *)entry);
                              
                  SMP_PRINTK(("prom_startcpu returned :)\n"));

                  /* wheee... it's going... */
                  for(timeout = 0; timeout < 10000; timeout++) {
                        if(cpu_callin_map[i])
                              break;
                        udelay(200);
                  }
                  
      if (!(cpu_callin_map[i])) {
            printk("Processor %d is stuck.\n", i);
            return -ENODEV;

      }
      local_flush_cache_all();
      return 0;
}

void __init smp4d_smp_done(void)
{
      int i, first;
      int *prev;

      /* setup cpu list for irq rotation */
      first = 0;
      prev = &first;
      for (i = 0; i < NR_CPUS; i++)
            if (cpu_online(i)) {
                  *prev = i;
                  prev = &cpu_data(i).next;
            }
      *prev = first;
      local_flush_cache_all();

      /* Free unneeded trap tables */
      ClearPageReserved(virt_to_page(trapbase_cpu1));
      init_page_count(virt_to_page(trapbase_cpu1));
      free_page((unsigned long)trapbase_cpu1);
      totalram_pages++;
      num_physpages++;

      ClearPageReserved(virt_to_page(trapbase_cpu2));
      init_page_count(virt_to_page(trapbase_cpu2));
      free_page((unsigned long)trapbase_cpu2);
      totalram_pages++;
      num_physpages++;

      ClearPageReserved(virt_to_page(trapbase_cpu3));
      init_page_count(virt_to_page(trapbase_cpu3));
      free_page((unsigned long)trapbase_cpu3);
      totalram_pages++;
      num_physpages++;

      /* Ok, they are spinning and ready to go. */
      smp_processors_ready = 1;
      sun4d_distribute_irqs();
}

static struct smp_funcall {
      smpfunc_t func;
      unsigned long arg1;
      unsigned long arg2;
      unsigned long arg3;
      unsigned long arg4;
      unsigned long arg5;
      unsigned char processors_in[NR_CPUS];  /* Set when ipi entered. */
      unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */
} ccall_info __attribute__((aligned(8)));

static DEFINE_SPINLOCK(cross_call_lock);

/* Cross calls must be serialized, at least currently. */
static void smp4d_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
                       unsigned long arg2, unsigned long arg3,
                       unsigned long arg4)
{
      if(smp_processors_ready) {
            register int high = smp_highest_cpu;
            unsigned long flags;

            spin_lock_irqsave(&cross_call_lock, flags);

            {
                  /* If you make changes here, make sure gcc generates proper code... */
                  register smpfunc_t f asm("i0") = func;
                  register unsigned long a1 asm("i1") = arg1;
                  register unsigned long a2 asm("i2") = arg2;
                  register unsigned long a3 asm("i3") = arg3;
                  register unsigned long a4 asm("i4") = arg4;
                  register unsigned long a5 asm("i5") = 0;

                  __asm__ __volatile__(
                        "std %0, [%6]\n\t"
                        "std %2, [%6 + 8]\n\t"
                        "std %4, [%6 + 16]\n\t" : :
                        "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),
                        "r" (&ccall_info.func));
            }

            /* Init receive/complete mapping, plus fire the IPI's off. */
            {
                  register int i;

                  cpu_clear(smp_processor_id(), mask);
                  cpus_and(mask, cpu_online_map, mask);
                  for(i = 0; i <= high; i++) {
                        if (cpu_isset(i, mask)) {
                              ccall_info.processors_in[i] = 0;
                              ccall_info.processors_out[i] = 0;
                              sun4d_send_ipi(i, IRQ_CROSS_CALL);
                        }
                  }
            }

            {
                  register int i;

                  i = 0;
                  do {
                        if (!cpu_isset(i, mask))
                              continue;
                        while(!ccall_info.processors_in[i])
                              barrier();
                  } while(++i <= high);

                  i = 0;
                  do {
                        if (!cpu_isset(i, mask))
                              continue;
                        while(!ccall_info.processors_out[i])
                              barrier();
                  } while(++i <= high);
            }

            spin_unlock_irqrestore(&cross_call_lock, flags);
      }
}

/* Running cross calls. */
void smp4d_cross_call_irq(void)
{
      int i = hard_smp4d_processor_id();

      ccall_info.processors_in[i] = 1;
      ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
                  ccall_info.arg4, ccall_info.arg5);
      ccall_info.processors_out[i] = 1;
}

void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
{
      struct pt_regs *old_regs;
      int cpu = hard_smp4d_processor_id();
      static int cpu_tick[NR_CPUS];
      static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };

      old_regs = set_irq_regs(regs);
      bw_get_prof_limit(cpu); 
      bw_clear_intr_mask(0, 1);     /* INTR_TABLE[0] & 1 is Profile IRQ */

      cpu_tick[cpu]++;
      if (!(cpu_tick[cpu] & 15)) {
            if (cpu_tick[cpu] == 0x60)
                  cpu_tick[cpu] = 0;
            cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
            show_leds(cpu);
      }

      profile_tick(CPU_PROFILING);

      if(!--prof_counter(cpu)) {
            int user = user_mode(regs);

            irq_enter();
            update_process_times(user);
            irq_exit();

            prof_counter(cpu) = prof_multiplier(cpu);
      }
      set_irq_regs(old_regs);
}

extern unsigned int lvl14_resolution;

static void __init smp_setup_percpu_timer(void)
{
      int cpu = hard_smp4d_processor_id();

      prof_counter(cpu) = prof_multiplier(cpu) = 1;
      load_profile_irq(cpu, lvl14_resolution);
}

void __init smp4d_blackbox_id(unsigned *addr)
{
      int rd = *addr & 0x3e000000;
      
      addr[0] = 0xc0800800 | rd;          /* lda [%g0] ASI_M_VIKING_TMP1, reg */
      addr[1] = 0x01000000;               /* nop */
      addr[2] = 0x01000000;               /* nop */
}

void __init smp4d_blackbox_current(unsigned *addr)
{
      int rd = *addr & 0x3e000000;
      
      addr[0] = 0xc0800800 | rd;          /* lda [%g0] ASI_M_VIKING_TMP1, reg */
      addr[2] = 0x81282002 | rd | (rd >> 11);   /* sll reg, 2, reg */
      addr[4] = 0x01000000;               /* nop */
}

void __init sun4d_init_smp(void)
{
      int i;
      extern unsigned int t_nmi[], linux_trap_ipi15_sun4d[], linux_trap_ipi15_sun4m[];

      /* Patch ipi15 trap table */
      t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
      
      /* And set btfixup... */
      BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id);
      BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
      BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
      BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
      
      for (i = 0; i < NR_CPUS; i++) {
            ccall_info.processors_in[i] = 1;
            ccall_info.processors_out[i] = 1;
      }
}

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