arch/ia64/kernel/sal.c

   1 /*
   2  * System Abstraction Layer (SAL) interface routines.
   3  *
   4  * Copyright (C) 1998, 1999, 2001, 2003 Hewlett-Packard Co
   5  *      David Mosberger-Tang <davidm@hpl.hp.com>
   6  * Copyright (C) 1999 VA Linux Systems
   7  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   8  */
   9 #include <linux/config.h>
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/string.h>
  15
  16 #include <asm/page.h>
  17 #include <asm/sal.h>
  18 #include <asm/pal.h>
  19
  20 spinlock_t sal_lock __cacheline_aligned = SPIN_LOCK_UNLOCKED;
  21 unsigned long sal_platform_features;
  22
  23 unsigned short sal_revision;
  24 unsigned short sal_version;
  25
  26 #define SAL_MAJOR(x) ((x) >> 8)
  27 #define SAL_MINOR(x) ((x) & 0xff)
  28
  29 static struct {
  30         void *addr;     /* function entry point */
  31         void *gpval;    /* gp value to use */
  32 } pdesc;
  33
  34 static long
  35 default_handler (void)
  36 {
  37         return -1;
  38 }
  39
  40 ia64_sal_handler ia64_sal = (ia64_sal_handler) default_handler;
  41 ia64_sal_desc_ptc_t *ia64_ptc_domain_info;
  42
  43 const char *
  44 ia64_sal_strerror (long status)
  45 {
  46         const char *str;
  47         switch (status) {
  48               case 0: str = "Call completed without error"; break;
  49               case 1: str = "Effect a warm boot of the system to complete "
  50                               "the update"; break;
  51               case -1: str = "Not implemented"; break;
  52               case -2: str = "Invalid argument"; break;
  53               case -3: str = "Call completed with error"; break;
  54               case -4: str = "Virtual address not registered"; break;
  55               case -5: str = "No information available"; break;
  56               case -6: str = "Insufficient space to add the entry"; break;
  57               case -7: str = "Invalid entry_addr value"; break;
  58               case -8: str = "Invalid interrupt vector"; break;
  59               case -9: str = "Requested memory not available"; break;
  60               case -10: str = "Unable to write to the NVM device"; break;
  61               case -11: str = "Invalid partition type specified"; break;
  62               case -12: str = "Invalid NVM_Object id specified"; break;
  63               case -13: str = "NVM_Object already has the maximum number "
  64                                 "of partitions"; break;
  65               case -14: str = "Insufficient space in partition for the "
  66                                 "requested write sub-function"; break;
  67               case -15: str = "Insufficient data buffer space for the "
  68                                 "requested read record sub-function"; break;
  69               case -16: str = "Scratch buffer required for the write/delete "
  70                                 "sub-function"; break;
  71               case -17: str = "Insufficient space in the NVM_Object for the "
  72                                 "requested create sub-function"; break;
  73               case -18: str = "Invalid value specified in the partition_rec "
  74                                 "argument"; break;
  75               case -19: str = "Record oriented I/O not supported for this "
  76                                 "partition"; break;
  77               case -20: str = "Bad format of record to be written or "
  78                                 "required keyword variable not "
  79                                 "specified"; break;
  80               default: str = "Unknown SAL status code"; break;
  81         }
  82         return str;
  83 }
  84
  85 void __init
  86 ia64_sal_handler_init (void *entry_point, void *gpval)
  87 {
  88         /* fill in the SAL procedure descriptor and point ia64_sal to it: */
  89         pdesc.addr = entry_point;
  90         pdesc.gpval = gpval;
  91         ia64_sal = (ia64_sal_handler) &pdesc;
  92 }
  93
  94 static void __init
  95 check_versions (struct ia64_sal_systab *systab)
  96 {
  97         sal_revision = (systab->sal_rev_major << 8) | systab->sal_rev_minor;
  98         sal_version = (systab->sal_b_rev_major << 8) | systab->sal_b_rev_minor;
  99
 100         /* Check for broken firmware */
 101         if ((sal_revision == SAL_VERSION_CODE(49, 29))
 102             && (sal_version == SAL_VERSION_CODE(49, 29)))
 103         {
 104                 /*
 105                  * Old firmware for zx2000 prototypes have this weird version number,
 106                  * reset it to something sane.
 107                  */
 108                 sal_revision = SAL_VERSION_CODE(2, 8);
 109                 sal_version = SAL_VERSION_CODE(0, 0);
 110         }
 111 }
 112
 113 static void __init
 114 sal_desc_entry_point (void *p)
 115 {
 116         struct ia64_sal_desc_entry_point *ep = p;
 117         ia64_pal_handler_init(__va(ep->pal_proc));
 118         ia64_sal_handler_init(__va(ep->sal_proc), __va(ep->gp));
 119 }
 120
 121 #ifdef CONFIG_SMP
 122 static void __init
 123 set_smp_redirect (int flag)
 124 {
 125         if (no_int_routing)
 126                 smp_int_redirect &= ~flag;
 127         else
 128                 smp_int_redirect |= flag;
 129 }
 130 #else
 131 #define set_smp_redirect(flag)  do { } while (0)
 132 #endif
 133
 134 static void __init
 135 sal_desc_platform_feature (void *p)
 136 {
 137         struct ia64_sal_desc_platform_feature *pf = p;
 138         sal_platform_features = pf->feature_mask;
 139
 140         printk(KERN_INFO "SAL Platform features:");
 141         if (!sal_platform_features) {
 142                 printk(" None\n");
 143                 return;
 144         }
 145
 146         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_BUS_LOCK)
 147                 printk(" BusLock");
 148         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT) {
 149                 printk(" IRQ_Redirection");
 150                 set_smp_redirect(SMP_IRQ_REDIRECTION);
 151         }
 152         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT) {
 153                 printk(" IPI_Redirection");
 154                 set_smp_redirect(SMP_IPI_REDIRECTION);
 155         }
 156         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)
 157                 printk(" ITC_Drift");
 158         printk("\n");
 159 }
 160
 161 #ifdef CONFIG_SMP
 162 static void __init
 163 sal_desc_ap_wakeup (void *p)
 164 {
 165         struct ia64_sal_desc_ap_wakeup *ap = p;
 166
 167         switch (ap->mechanism) {
 168         case IA64_SAL_AP_EXTERNAL_INT:
 169                 ap_wakeup_vector = ap->vector;
 170                 printk(KERN_INFO "SAL: AP wakeup using external interrupt "
 171                                 "vector 0x%lx\n", ap_wakeup_vector);
 172                 break;
 173         default:
 174                 printk(KERN_ERR "SAL: AP wakeup mechanism unsupported!\n");
 175                 break;
 176         }
 177 }
 178 #else
 179 static void __init sal_desc_ap_wakeup(void *p) { }
 180 #endif
 181
 182 void __init
 183 ia64_sal_init (struct ia64_sal_systab *systab)
 184 {
 185         char *p;
 186         int i;
 187
 188         if (!systab) {
 189                 printk(KERN_WARNING "Hmm, no SAL System Table.\n");
 190                 return;
 191         }
 192
 193         if (strncmp(systab->signature, "SST_", 4) != 0)
 194                 printk(KERN_ERR "bad signature in system table!");
 195
 196         check_versions(systab);
 197
 198         /* revisions are coded in BCD, so %x does the job for us */
 199         printk(KERN_INFO "SAL %x.%x: %.32s %.32s%sversion %x.%x\n",
 200                         SAL_MAJOR(sal_revision), SAL_MINOR(sal_revision),
 201                         systab->oem_id, systab->product_id,
 202                         systab->product_id[0] ? " " : "",
 203                         SAL_MAJOR(sal_version), SAL_MINOR(sal_version));
 204
 205         p = (char *) (systab + 1);
 206         for (i = 0; i < systab->entry_count; i++) {
 207                 /*
 208                  * The first byte of each entry type contains the type
 209                  * descriptor.
 210                  */
 211                 switch (*p) {
 212                 case SAL_DESC_ENTRY_POINT:
 213                         sal_desc_entry_point(p);
 214                         break;
 215                 case SAL_DESC_PLATFORM_FEATURE:
 216                         sal_desc_platform_feature(p);
 217                         break;
 218                 case SAL_DESC_PTC:
 219                         ia64_ptc_domain_info = (ia64_sal_desc_ptc_t *)p;
 220                         break;
 221                 case SAL_DESC_AP_WAKEUP:
 222                         sal_desc_ap_wakeup(p);
 223                         break;
 224                 }
 225                 p += SAL_DESC_SIZE(*p);
 226         }
 227 }