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sal.c

/*
 * System Abstraction Layer (SAL) interface routines.
 *
 * Copyright (C) 1998, 1999, 2001, 2003 Hewlett-Packard Co
 *    David Mosberger-Tang <davidm@hpl.hp.com>
 * Copyright (C) 1999 VA Linux Systems
 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/string.h>

#include <asm/delay.h>
#include <asm/page.h>
#include <asm/sal.h>
#include <asm/pal.h>

 __cacheline_aligned DEFINE_SPINLOCK(sal_lock);
unsigned long sal_platform_features;

unsigned short sal_revision;
unsigned short sal_version;

#define SAL_MAJOR(x) ((x) >> 8)
#define SAL_MINOR(x) ((x) & 0xff)

static struct {
      void *addr; /* function entry point */
      void *gpval;      /* gp value to use */
} pdesc;

static long
default_handler (void)
{
      return -1;
}

ia64_sal_handler ia64_sal = (ia64_sal_handler) default_handler;
ia64_sal_desc_ptc_t *ia64_ptc_domain_info;

const char *
ia64_sal_strerror (long status)
{
      const char *str;
      switch (status) {
            case 0: str = "Call completed without error"; break;
            case 1: str = "Effect a warm boot of the system to complete "
                        "the update"; break;
            case -1: str = "Not implemented"; break;
            case -2: str = "Invalid argument"; break;
            case -3: str = "Call completed with error"; break;
            case -4: str = "Virtual address not registered"; break;
            case -5: str = "No information available"; break;
            case -6: str = "Insufficient space to add the entry"; break;
            case -7: str = "Invalid entry_addr value"; break;
            case -8: str = "Invalid interrupt vector"; break;
            case -9: str = "Requested memory not available"; break;
            case -10: str = "Unable to write to the NVM device"; break;
            case -11: str = "Invalid partition type specified"; break;
            case -12: str = "Invalid NVM_Object id specified"; break;
            case -13: str = "NVM_Object already has the maximum number "
                        "of partitions"; break;
            case -14: str = "Insufficient space in partition for the "
                        "requested write sub-function"; break;
            case -15: str = "Insufficient data buffer space for the "
                        "requested read record sub-function"; break;
            case -16: str = "Scratch buffer required for the write/delete "
                        "sub-function"; break;
            case -17: str = "Insufficient space in the NVM_Object for the "
                        "requested create sub-function"; break;
            case -18: str = "Invalid value specified in the partition_rec "
                        "argument"; break;
            case -19: str = "Record oriented I/O not supported for this "
                        "partition"; break;
            case -20: str = "Bad format of record to be written or "
                        "required keyword variable not "
                        "specified"; break;
            default: str = "Unknown SAL status code"; break;
      }
      return str;
}

void __init
ia64_sal_handler_init (void *entry_point, void *gpval)
{
      /* fill in the SAL procedure descriptor and point ia64_sal to it: */
      pdesc.addr = entry_point;
      pdesc.gpval = gpval;
      ia64_sal = (ia64_sal_handler) &pdesc;
}

static void __init
check_versions (struct ia64_sal_systab *systab)
{
      sal_revision = (systab->sal_rev_major << 8) | systab->sal_rev_minor;
      sal_version = (systab->sal_b_rev_major << 8) | systab->sal_b_rev_minor;

      /* Check for broken firmware */
      if ((sal_revision == SAL_VERSION_CODE(49, 29))
          && (sal_version == SAL_VERSION_CODE(49, 29)))
      {
            /*
             * Old firmware for zx2000 prototypes have this weird version number,
             * reset it to something sane.
             */
            sal_revision = SAL_VERSION_CODE(2, 8);
            sal_version = SAL_VERSION_CODE(0, 0);
      }

      if (ia64_platform_is("sn2") && (sal_revision == SAL_VERSION_CODE(2, 9)))
            /*
             * SGI Altix has hard-coded version 2.9 in their prom
             * but they actually implement 3.2, so let's fix it here.
             */
            sal_revision = SAL_VERSION_CODE(3, 2);
}

static void __init
sal_desc_entry_point (void *p)
{
      struct ia64_sal_desc_entry_point *ep = p;
      ia64_pal_handler_init(__va(ep->pal_proc));
      ia64_sal_handler_init(__va(ep->sal_proc), __va(ep->gp));
}

#ifdef CONFIG_SMP
static void __init
set_smp_redirect (int flag)
{
#ifndef CONFIG_HOTPLUG_CPU
      if (no_int_routing)
            smp_int_redirect &= ~flag;
      else
            smp_int_redirect |= flag;
#else
      /*
       * For CPU Hotplug we dont want to do any chipset supported
       * interrupt redirection. The reason is this would require that
       * All interrupts be stopped and hard bind the irq to a cpu.
       * Later when the interrupt is fired we need to set the redir hint
       * on again in the vector. This is cumbersome for something that the
       * user mode irq balancer will solve anyways.
       */
      no_int_routing=1;
      smp_int_redirect &= ~flag;
#endif
}
#else
#define set_smp_redirect(flag)      do { } while (0)
#endif

static void __init
sal_desc_platform_feature (void *p)
{
      struct ia64_sal_desc_platform_feature *pf = p;
      sal_platform_features = pf->feature_mask;

      printk(KERN_INFO "SAL Platform features:");
      if (!sal_platform_features) {
            printk(" None\n");
            return;
      }

      if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_BUS_LOCK)
            printk(" BusLock");
      if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT) {
            printk(" IRQ_Redirection");
            set_smp_redirect(SMP_IRQ_REDIRECTION);
      }
      if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT) {
            printk(" IPI_Redirection");
            set_smp_redirect(SMP_IPI_REDIRECTION);
      }
      if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)
            printk(" ITC_Drift");
      printk("\n");
}

#ifdef CONFIG_SMP
static void __init
sal_desc_ap_wakeup (void *p)
{
      struct ia64_sal_desc_ap_wakeup *ap = p;

      switch (ap->mechanism) {
      case IA64_SAL_AP_EXTERNAL_INT:
            ap_wakeup_vector = ap->vector;
            printk(KERN_INFO "SAL: AP wakeup using external interrupt "
                        "vector 0x%lx\n", ap_wakeup_vector);
            break;
      default:
            printk(KERN_ERR "SAL: AP wakeup mechanism unsupported!\n");
            break;
      }
}

static void __init
chk_nointroute_opt(void)
{
      char *cp;

      for (cp = boot_command_line; *cp; ) {
            if (memcmp(cp, "nointroute", 10) == 0) {
                  no_int_routing = 1;
                  printk ("no_int_routing on\n");
                  break;
            } else {
                  while (*cp != ' ' && *cp)
                        ++cp;
                  while (*cp == ' ')
                        ++cp;
            }
      }
}

#else
static void __init sal_desc_ap_wakeup(void *p) { }
#endif

/*
 * HP rx5670 firmware polls for interrupts during SAL_CACHE_FLUSH by reading
 * cr.ivr, but it never writes cr.eoi.  This leaves any interrupt marked as
 * "in-service" and masks other interrupts of equal or lower priority.
 *
 * HP internal defect reports: F1859, F2775, F3031.
 */
static int sal_cache_flush_drops_interrupts;

static int __init
force_pal_cache_flush(char *str)
{
      sal_cache_flush_drops_interrupts = 1;
      return 0;
}
early_param("force_pal_cache_flush", force_pal_cache_flush);

void __init
check_sal_cache_flush (void)
{
      unsigned long flags;
      int cpu;
      u64 vector, cache_type = 3;
      struct ia64_sal_retval isrv;

      if (sal_cache_flush_drops_interrupts)
            return;

      cpu = get_cpu();
      local_irq_save(flags);

      /*
       * Send ourselves a timer interrupt, wait until it's reported, and see
       * if SAL_CACHE_FLUSH drops it.
       */
      platform_send_ipi(cpu, IA64_TIMER_VECTOR, IA64_IPI_DM_INT, 0);

      while (!ia64_get_irr(IA64_TIMER_VECTOR))
            cpu_relax();

      SAL_CALL(isrv, SAL_CACHE_FLUSH, cache_type, 0, 0, 0, 0, 0, 0);

      if (isrv.status)
            printk(KERN_ERR "SAL_CAL_FLUSH failed with %ld\n", isrv.status);

      if (ia64_get_irr(IA64_TIMER_VECTOR)) {
            vector = ia64_get_ivr();
            ia64_eoi();
            WARN_ON(vector != IA64_TIMER_VECTOR);
      } else {
            sal_cache_flush_drops_interrupts = 1;
            printk(KERN_ERR "SAL: SAL_CACHE_FLUSH drops interrupts; "
                  "PAL_CACHE_FLUSH will be used instead\n");
            ia64_eoi();
      }

      local_irq_restore(flags);
      put_cpu();
}

s64
ia64_sal_cache_flush (u64 cache_type)
{
      struct ia64_sal_retval isrv;

      if (sal_cache_flush_drops_interrupts) {
            unsigned long flags;
            u64 progress;
            s64 rc;

            progress = 0;
            local_irq_save(flags);
            rc = ia64_pal_cache_flush(cache_type,
                  PAL_CACHE_FLUSH_INVALIDATE, &progress, NULL);
            local_irq_restore(flags);
            return rc;
      }

      SAL_CALL(isrv, SAL_CACHE_FLUSH, cache_type, 0, 0, 0, 0, 0, 0);
      return isrv.status;
}
EXPORT_SYMBOL_GPL(ia64_sal_cache_flush);

void __init
ia64_sal_init (struct ia64_sal_systab *systab)
{
      char *p;
      int i;

      if (!systab) {
            printk(KERN_WARNING "Hmm, no SAL System Table.\n");
            return;
      }

      if (strncmp(systab->signature, "SST_", 4) != 0)
            printk(KERN_ERR "bad signature in system table!");

      check_versions(systab);
#ifdef CONFIG_SMP
      chk_nointroute_opt();
#endif

      /* revisions are coded in BCD, so %x does the job for us */
      printk(KERN_INFO "SAL %x.%x: %.32s %.32s%sversion %x.%x\n",
                  SAL_MAJOR(sal_revision), SAL_MINOR(sal_revision),
                  systab->oem_id, systab->product_id,
                  systab->product_id[0] ? " " : "",
                  SAL_MAJOR(sal_version), SAL_MINOR(sal_version));

      p = (char *) (systab + 1);
      for (i = 0; i < systab->entry_count; i++) {
            /*
             * The first byte of each entry type contains the type
             * descriptor.
             */
            switch (*p) {
            case SAL_DESC_ENTRY_POINT:
                  sal_desc_entry_point(p);
                  break;
            case SAL_DESC_PLATFORM_FEATURE:
                  sal_desc_platform_feature(p);
                  break;
            case SAL_DESC_PTC:
                  ia64_ptc_domain_info = (ia64_sal_desc_ptc_t *)p;
                  break;
            case SAL_DESC_AP_WAKEUP:
                  sal_desc_ap_wakeup(p);
                  break;
            }
            p += SAL_DESC_SIZE(*p);
      }

}

int
ia64_sal_oemcall(struct ia64_sal_retval *isrvp, u64 oemfunc, u64 arg1,
             u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7)
{
      if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
            return -1;
      SAL_CALL(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
      return 0;
}
EXPORT_SYMBOL(ia64_sal_oemcall);

int
ia64_sal_oemcall_nolock(struct ia64_sal_retval *isrvp, u64 oemfunc, u64 arg1,
                  u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6,
                  u64 arg7)
{
      if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
            return -1;
      SAL_CALL_NOLOCK(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6,
                  arg7);
      return 0;
}
EXPORT_SYMBOL(ia64_sal_oemcall_nolock);

int
ia64_sal_oemcall_reentrant(struct ia64_sal_retval *isrvp, u64 oemfunc,
                     u64 arg1, u64 arg2, u64 arg3, u64 arg4, u64 arg5,
                     u64 arg6, u64 arg7)
{
      if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
            return -1;
      SAL_CALL_REENTRANT(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6,
                     arg7);
      return 0;
}
EXPORT_SYMBOL(ia64_sal_oemcall_reentrant);

long
ia64_sal_freq_base (unsigned long which, unsigned long *ticks_per_second,
                unsigned long *drift_info)
{
      struct ia64_sal_retval isrv;

      SAL_CALL(isrv, SAL_FREQ_BASE, which, 0, 0, 0, 0, 0, 0);
      *ticks_per_second = isrv.v0;
      *drift_info = isrv.v1;
      return isrv.status;
}
EXPORT_SYMBOL_GPL(ia64_sal_freq_base);

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