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

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

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

#define SAL_DEBUG

spinlock_t sal_lock = SPIN_LOCK_UNLOCKED;

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;

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;
}

static 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;
}


void __init
ia64_sal_init (struct ia64_sal_systab *systab)
{
	unsigned long min, max;
	char *p;
	struct ia64_sal_desc_entry_point *ep;
	int i;

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

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

	printk("SAL v%u.%02u: ia32bios=%s, oem=%.32s, product=%.32s\n",
	       systab->sal_rev_major, systab->sal_rev_minor,
	       systab->ia32_bios_present ? "present" : "absent",
	       systab->oem_id, systab->product_id);

	min = ~0UL;
	max = 0;

	p = (char *) (systab + 1);
	for (i = 0; i < systab->entry_count; i++) {
		/*
		 * The first byte of each entry type contains the type desciptor.
		 */
		switch (*p) {
		      case SAL_DESC_ENTRY_POINT:
			ep = (struct ia64_sal_desc_entry_point *) p;
#ifdef SAL_DEBUG
			printk("sal[%d] - entry: pal_proc=0x%lx, sal_proc=0x%lx\n",
			       i, ep->pal_proc, ep->sal_proc);
#endif
			ia64_pal_handler_init(__va(ep->pal_proc));
			ia64_sal_handler_init(__va(ep->sal_proc), __va(ep->gp));
			break;

		      case SAL_DESC_AP_WAKEUP:
#ifdef CONFIG_SMP
		      {
			      struct ia64_sal_desc_ap_wakeup *ap = (void *) p;
# ifdef SAL_DEBUG
			      printk("sal[%d] - wakeup type %x, 0x%lx\n",
				     i, ap->mechanism, ap->vector);
# endif
			      switch (ap->mechanism) {
				    case IA64_SAL_AP_EXTERNAL_INT:
				      ap_wakeup_vector = ap->vector;
# ifdef SAL_DEBUG
				      printk("SAL: AP wakeup using external interrupt; "
					     "vector 0x%lx\n", ap_wakeup_vector);
# endif
				      break;

				    default:
				      printk("SAL: AP wakeup mechanism unsupported!\n");
				      break;
			      }
			      break;
		      }
#endif
		}
		p += SAL_DESC_SIZE(*p);
	}
}