1 /* $Id: console.c,v 1.10 1996/12/18 06:46:54 tridge Exp $
2 * console.c: Routines that deal with sending and receiving IO
3 * to/from the current console device using the PROM.
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/sched.h>
11 #include <asm/openprom.h>
12 #include <asm/oplib.h>
13 #include <asm/system.h>
14 #include <linux/string.h>
16 /* Non blocking get character from console input device, returns -1
17 * if no input was taken. This can be used for polling.
25 local_irq_save(flags);
26 i = (*(romvec->pv_nbgetchar))();
27 local_irq_restore(flags);
28 return i; /* Ugh, we could spin forever on unsupported proms ;( */
31 /* Non blocking put character to console device, returns -1 if
35 prom_nbputchar(char c)
40 local_irq_save(flags);
41 i = (*(romvec->pv_nbputchar))(c);
42 local_irq_restore(flags);
43 return i; /* Ugh, we could spin forever on unsupported proms ;( */
46 /* Blocking version of get character routine above. */
51 while((character = prom_nbgetchar()) == -1) ;
52 return (char) character;
55 /* Blocking version of put character routine above. */
59 while(prom_nbputchar(c) == -1) ;
63 /* Query for input device type */
65 enum prom_input_device
66 prom_query_input_device()
77 switch(*romvec->pv_stdin) {
78 case PROMDEV_KBD: return PROMDEV_IKBD;
79 case PROMDEV_TTYA: return PROMDEV_ITTYA;
80 case PROMDEV_TTYB: return PROMDEV_ITTYB;
86 local_irq_save(flags);
87 st_p = (*romvec->pv_v2devops.v2_inst2pkg)(*romvec->pv_v2bootargs.fd_stdin);
88 __asm__ __volatile__("ld [%0], %%g6\n\t" : :
89 "r" (¤t_set[smp_processor_id()]) :
91 local_irq_restore(flags);
92 if(prom_node_has_property(st_p, "keyboard"))
94 prom_getproperty(st_p, "device_type", propb, sizeof(propb));
95 if(strncmp(propb, "serial", sizeof("serial")))
97 prom_getproperty(prom_root_node, "stdin-path", propb, sizeof(propb));
99 while(*p) p++; p -= 2;
102 return PROMDEV_ITTYA;
104 return PROMDEV_ITTYB;
106 return PROMDEV_I_UNK;
108 return PROMDEV_I_UNK;
113 /* Query for output device type */
116 enum prom_output_device
117 prom_query_output_device()
127 switch(*romvec->pv_stdin) {
128 case PROMDEV_SCREEN: return PROMDEV_OSCREEN;
129 case PROMDEV_TTYA: return PROMDEV_OTTYA;
130 case PROMDEV_TTYB: return PROMDEV_OTTYB;
136 local_irq_save(flags);
137 st_p = (*romvec->pv_v2devops.v2_inst2pkg)(*romvec->pv_v2bootargs.fd_stdout);
138 __asm__ __volatile__("ld [%0], %%g6\n\t" : :
139 "r" (¤t_set[smp_processor_id()]) :
141 local_irq_restore(flags);
142 propl = prom_getproperty(st_p, "device_type", propb, sizeof(propb));
143 if (propl >= 0 && propl == sizeof("display") &&
144 strncmp("display", propb, sizeof("display")) == 0)
146 return PROMDEV_OSCREEN;
148 if(prom_vers == PROM_V3) {
149 if(strncmp("serial", propb, sizeof("serial")))
150 return PROMDEV_O_UNK;
151 prom_getproperty(prom_root_node, "stdout-path", propb, sizeof(propb));
153 while(*p) p++; p -= 2;
156 return PROMDEV_OTTYA;
158 return PROMDEV_OTTYB;
160 return PROMDEV_O_UNK;
162 /* This works on SS-2 (an early OpenFirmware) still. */
163 switch(*romvec->pv_stdin) {
164 case PROMDEV_TTYA: return PROMDEV_OTTYA;
165 case PROMDEV_TTYB: return PROMDEV_OTTYB;
170 return PROMDEV_I_UNK;
172 return PROMDEV_O_UNK;