Merge branch 'hostprogs-wmissing-prototypes' of git://git.kernel.org/pub/scm/linux...
[linux-2.6.git] / 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. prom_callback() drops this lock
36  * to allow recursuve acquisition.
37  */
38 DEFINE_SPINLOCK(prom_entry_lock);
39
40 long p1275_cmd(const char *service, long fmt, ...)
41 {
42         char *p, *q;
43         unsigned long flags;
44         int nargs, nrets, i;
45         va_list list;
46         long attrs, x;
47         
48         p = p1275buf.prom_buffer;
49
50         spin_lock_irqsave(&prom_entry_lock, flags);
51
52         p1275buf.prom_args[0] = (unsigned long)p;               /* service */
53         strcpy (p, service);
54         p = (char *)(((long)(strchr (p, 0) + 8)) & ~7);
55         p1275buf.prom_args[1] = nargs = (fmt & 0x0f);           /* nargs */
56         p1275buf.prom_args[2] = nrets = ((fmt & 0xf0) >> 4);    /* nrets */
57         attrs = fmt >> 8;
58         va_start(list, fmt);
59         for (i = 0; i < nargs; i++, attrs >>= 3) {
60                 switch (attrs & 0x7) {
61                 case P1275_ARG_NUMBER:
62                         p1275buf.prom_args[i + 3] =
63                                                 (unsigned)va_arg(list, long);
64                         break;
65                 case P1275_ARG_IN_64B:
66                         p1275buf.prom_args[i + 3] =
67                                 va_arg(list, unsigned long);
68                         break;
69                 case P1275_ARG_IN_STRING:
70                         strcpy (p, va_arg(list, char *));
71                         p1275buf.prom_args[i + 3] = (unsigned long)p;
72                         p = (char *)(((long)(strchr (p, 0) + 8)) & ~7);
73                         break;
74                 case P1275_ARG_OUT_BUF:
75                         (void) va_arg(list, char *);
76                         p1275buf.prom_args[i + 3] = (unsigned long)p;
77                         x = va_arg(list, long);
78                         i++; attrs >>= 3;
79                         p = (char *)(((long)(p + (int)x + 7)) & ~7);
80                         p1275buf.prom_args[i + 3] = x;
81                         break;
82                 case P1275_ARG_IN_BUF:
83                         q = va_arg(list, char *);
84                         p1275buf.prom_args[i + 3] = (unsigned long)p;
85                         x = va_arg(list, long);
86                         i++; attrs >>= 3;
87                         memcpy (p, q, (int)x);
88                         p = (char *)(((long)(p + (int)x + 7)) & ~7);
89                         p1275buf.prom_args[i + 3] = x;
90                         break;
91                 case P1275_ARG_OUT_32B:
92                         (void) va_arg(list, char *);
93                         p1275buf.prom_args[i + 3] = (unsigned long)p;
94                         p += 32;
95                         break;
96                 case P1275_ARG_IN_FUNCTION:
97                         p1275buf.prom_args[i + 3] =
98                                         (unsigned long)prom_cif_callback;
99                         p1275buf.prom_callback = va_arg(list, long);
100                         break;
101                 }
102         }
103         va_end(list);
104
105         prom_world(1);
106         prom_cif_interface();
107         prom_world(0);
108
109         attrs = fmt >> 8;
110         va_start(list, fmt);
111         for (i = 0; i < nargs; i++, attrs >>= 3) {
112                 switch (attrs & 0x7) {
113                 case P1275_ARG_NUMBER:
114                         (void) va_arg(list, long);
115                         break;
116                 case P1275_ARG_IN_STRING:
117                         (void) va_arg(list, char *);
118                         break;
119                 case P1275_ARG_IN_FUNCTION:
120                         (void) va_arg(list, long);
121                         break;
122                 case P1275_ARG_IN_BUF:
123                         (void) va_arg(list, char *);
124                         (void) va_arg(list, long);
125                         i++; attrs >>= 3;
126                         break;
127                 case P1275_ARG_OUT_BUF:
128                         p = va_arg(list, char *);
129                         x = va_arg(list, long);
130                         memcpy (p, (char *)(p1275buf.prom_args[i + 3]), (int)x);
131                         i++; attrs >>= 3;
132                         break;
133                 case P1275_ARG_OUT_32B:
134                         p = va_arg(list, char *);
135                         memcpy (p, (char *)(p1275buf.prom_args[i + 3]), 32);
136                         break;
137                 }
138         }
139         va_end(list);
140         x = p1275buf.prom_args [nargs + 3];
141
142         spin_unlock_irqrestore(&prom_entry_lock, flags);
143
144         return x;
145 }
146
147 void prom_cif_init(void *cif_handler, void *cif_stack)
148 {
149         p1275buf.prom_cif_handler = (void (*)(long *))cif_handler;
150         p1275buf.prom_cif_stack = (unsigned long)cif_stack;
151 }