arch/sparc64/kernel/cpu.c

   1 /* cpu.c: Dinky routines to look for the kind of Sparc cpu
   2  *        we are on.
   3  *
   4  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/init.h>
   9 #include <linux/sched.h>
  10 #include <linux/smp.h>
  11 #include <asm/asi.h>
  12 #include <asm/system.h>
  13 #include <asm/fpumacro.h>
  14
  15 struct cpu_iu_info {
  16   short manuf;
  17   short impl;
  18   char* cpu_name;   /* should be enough I hope... */
  19 };
  20
  21 struct cpu_fp_info {
  22   short manuf;
  23   short impl;
  24   char fpu_vers;
  25   char* fp_name;
  26 };
  27
  28 /* In order to get the fpu type correct, you need to take the IDPROM's
  29  * machine type value into consideration too.  I will fix this.
  30  */
  31 struct cpu_fp_info linux_sparc_fpu[] = {
  32   { 0x17, 0x10, 0, "UltraSparc I integrated FPU"},
  33   { 0x22, 0x10, 0, "UltraSparc II integrated FPU"},
  34   { 0x17, 0x11, 0, "UltraSparc II integrated FPU"},
  35   { 0x17, 0x12, 0, "UltraSparc IIi integrated FPU"},
  36   { 0x17, 0x14, 0, "UltraSparc III integrated FPU"},
  37 };
  38
  39 #define NSPARCFPU  (sizeof(linux_sparc_fpu)/sizeof(struct cpu_fp_info))
  40
  41 struct cpu_iu_info linux_sparc_chips[] = {
  42   { 0x17, 0x10, "TI UltraSparc I   (SpitFire)"},
  43   { 0x22, 0x10, "TI UltraSparc II  (BlackBird)"},
  44   { 0x17, 0x11, "TI UltraSparc II  (BlackBird)"},
  45   { 0x17, 0x12, "TI UltraSparc IIi"},
  46   { 0x17, 0x14, "TI UltraSparc III (Cheetah)"},  /* A guess... */
  47 };
  48
  49 #define NSPARCCHIPS  (sizeof(linux_sparc_chips)/sizeof(struct cpu_iu_info))
  50
  51 #ifdef __SMP__
  52 char *sparc_cpu_type[64] = { "cpu-oops", "cpu-oops1", "cpu-oops2", "cpu-oops3" };
  53 char *sparc_fpu_type[64] = { "fpu-oops", "fpu-oops1", "fpu-oops2", "fpu-oops3" };
  54 #else
  55 char *sparc_cpu_type[64] = { "cpu-oops", };
  56 char *sparc_fpu_type[64] = { "fpu-oops", };
  57 #endif
  58
  59 unsigned int fsr_storage;
  60
  61 void __init cpu_probe(void)
  62 {
  63         int manuf, impl;
  64         unsigned i, cpuid;
  65         long ver, fpu_vers;
  66         long fprs;
  67
  68         cpuid = hard_smp_processor_id();
  69
  70         fprs = fprs_read ();
  71         fprs_write (FPRS_FEF);
  72         __asm__ __volatile__ ("rdpr %%ver, %0; stx %%fsr, [%1]" : "=&r" (ver) : "r" (&fpu_vers));
  73         fprs_write (fprs);
  74
  75         manuf = ((ver >> 48)&0xffff);
  76         impl = ((ver >> 32)&0xffff);
  77
  78         fpu_vers = ((fpu_vers>>17)&0x7);
  79
  80         for(i = 0; i<NSPARCCHIPS; i++) {
  81                 if(linux_sparc_chips[i].manuf == manuf)
  82                         if(linux_sparc_chips[i].impl == impl) {
  83                                 sparc_cpu_type[cpuid] = linux_sparc_chips[i].cpu_name;
  84                                 break;
  85                         }
  86         }
  87
  88         if(i==NSPARCCHIPS) {
  89                 printk("DEBUG: manuf = 0x%x   impl = 0x%x\n", manuf,
  90                             impl);
  91                 sparc_cpu_type[cpuid] = "Unknown CPU";
  92         }
  93
  94         for(i = 0; i<NSPARCFPU; i++) {
  95                 if(linux_sparc_fpu[i].manuf == manuf && linux_sparc_fpu[i].impl == impl)
  96                         if(linux_sparc_fpu[i].fpu_vers == fpu_vers) {
  97                                 sparc_fpu_type[cpuid] = linux_sparc_fpu[i].fp_name;
  98                                 break;
  99                         }
 100         }
 101
 102         if(i == NSPARCFPU) {
 103                 printk("DEBUG: manuf = 0x%x  impl = 0x%x fsr.vers = 0x%x\n", manuf, impl,
 104                             (unsigned)fpu_vers);
 105                 sparc_fpu_type[cpuid] = "Unknown FPU";
 106         }
 107 }