arch/sparc/prom/p1275.c

   1 /*
   2  * p1275.c: Sun IEEE 1275 PROM low level interface routines
   3  *
   4  * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/init.h>
   9 #include <linux/sched.h>
  10 #include <linux/smp.h>
  11 #include <linux/string.h>
  12 #include <linux/spinlock.h>
  13
  14 #include <asm/openprom.h>
  15 #include <asm/oplib.h>
  16 #include <asm/system.h>
  17 #include <asm/spitfire.h>
  18 #include <asm/pstate.h>
  19 #include <asm/ldc.h>
  20
  21 struct {
  22         long prom_callback;                     /* 0x00 */
  23         void (*prom_cif_handler)(long *);       /* 0x08 */
  24         unsigned long prom_cif_stack;           /* 0x10 */
  25         unsigned long prom_args [23];           /* 0x18 */
  26         char prom_buffer [3000];
  27 } p1275buf;
  28
  29 extern void prom_world(int);
  30
  31 extern void prom_cif_interface(void);
  32 extern void prom_cif_callback(void);
  33
  34 /*
  35  * This provides SMP safety on the p1275buf.
  36  */
  37 DEFINE_RAW_SPINLOCK(prom_entry_lock);
  38
  39 long p1275_cmd(const char *service, long fmt, ...)
  40 {
  41         char *p, *q;
  42         unsigned long flags;
  43         int nargs, nrets, i;
  44         va_list list;
  45         long attrs, x;
  46
  47         p = p1275buf.prom_buffer;
  48
  49         raw_local_save_flags(flags);
  50         raw_local_irq_restore(PIL_NMI);
  51         raw_spin_lock(&prom_entry_lock);
  52
  53         p1275buf.prom_args[0] = (unsigned long)p;               /* service */
  54         strcpy (p, service);
  55         p = (char *)(((long)(strchr (p, 0) + 8)) & ~7);
  56         p1275buf.prom_args[1] = nargs = (fmt & 0x0f);           /* nargs */
  57         p1275buf.prom_args[2] = nrets = ((fmt & 0xf0) >> 4);    /* nrets */
  58         attrs = fmt >> 8;
  59         va_start(list, fmt);
  60         for (i = 0; i < nargs; i++, attrs >>= 3) {
  61                 switch (attrs & 0x7) {
  62                 case P1275_ARG_NUMBER:
  63                         p1275buf.prom_args[i + 3] =
  64                                                 (unsigned)va_arg(list, long);
  65                         break;
  66                 case P1275_ARG_IN_64B:
  67                         p1275buf.prom_args[i + 3] =
  68                                 va_arg(list, unsigned long);
  69                         break;
  70                 case P1275_ARG_IN_STRING:
  71                         strcpy (p, va_arg(list, char *));
  72                         p1275buf.prom_args[i + 3] = (unsigned long)p;
  73                         p = (char *)(((long)(strchr (p, 0) + 8)) & ~7);
  74                         break;
  75                 case P1275_ARG_OUT_BUF:
  76                         (void) va_arg(list, char *);
  77                         p1275buf.prom_args[i + 3] = (unsigned long)p;
  78                         x = va_arg(list, long);
  79                         i++; attrs >>= 3;
  80                         p = (char *)(((long)(p + (int)x + 7)) & ~7);
  81                         p1275buf.prom_args[i + 3] = x;
  82                         break;
  83                 case P1275_ARG_IN_BUF:
  84                         q = va_arg(list, char *);
  85                         p1275buf.prom_args[i + 3] = (unsigned long)p;
  86                         x = va_arg(list, long);
  87                         i++; attrs >>= 3;
  88                         memcpy (p, q, (int)x);
  89                         p = (char *)(((long)(p + (int)x + 7)) & ~7);
  90                         p1275buf.prom_args[i + 3] = x;
  91                         break;
  92                 case P1275_ARG_OUT_32B:
  93                         (void) va_arg(list, char *);
  94                         p1275buf.prom_args[i + 3] = (unsigned long)p;
  95                         p += 32;
  96                         break;
  97                 case P1275_ARG_IN_FUNCTION:
  98                         p1275buf.prom_args[i + 3] =
  99                                         (unsigned long)prom_cif_callback;
 100                         p1275buf.prom_callback = va_arg(list, long);
 101                         break;
 102                 }
 103         }
 104         va_end(list);
 105
 106         prom_world(1);
 107         prom_cif_interface();
 108         prom_world(0);
 109
 110         attrs = fmt >> 8;
 111         va_start(list, fmt);
 112         for (i = 0; i < nargs; i++, attrs >>= 3) {
 113                 switch (attrs & 0x7) {
 114                 case P1275_ARG_NUMBER:
 115                         (void) va_arg(list, long);
 116                         break;
 117                 case P1275_ARG_IN_STRING:
 118                         (void) va_arg(list, char *);
 119                         break;
 120                 case P1275_ARG_IN_FUNCTION:
 121                         (void) va_arg(list, long);
 122                         break;
 123                 case P1275_ARG_IN_BUF:
 124                         (void) va_arg(list, char *);
 125                         (void) va_arg(list, long);
 126                         i++; attrs >>= 3;
 127                         break;
 128                 case P1275_ARG_OUT_BUF:
 129                         p = va_arg(list, char *);
 130                         x = va_arg(list, long);
 131                         memcpy (p, (char *)(p1275buf.prom_args[i + 3]), (int)x);
 132                         i++; attrs >>= 3;
 133                         break;
 134                 case P1275_ARG_OUT_32B:
 135                         p = va_arg(list, char *);
 136                         memcpy (p, (char *)(p1275buf.prom_args[i + 3]), 32);
 137                         break;
 138                 }
 139         }
 140         va_end(list);
 141         x = p1275buf.prom_args [nargs + 3];
 142
 143         raw_spin_unlock(&prom_entry_lock);
 144         raw_local_irq_restore(flags);
 145
 146         return x;
 147 }
 148
 149 void prom_cif_init(void *cif_handler, void *cif_stack)
 150 {
 151         p1275buf.prom_cif_handler = (void (*)(long *))cif_handler;
 152         p1275buf.prom_cif_stack = (unsigned long)cif_stack;
 153 }