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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 | // SPDX-License-Identifier: GPL-2.0 /* * console.c: Routines that deal with sending and receiving IO * to/from the current console device using the PROM. * * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/sched.h> #include <asm/openprom.h> #include <asm/oplib.h> #include <linux/string.h> /* Non blocking get character from console input device, returns -1 * if no input was taken. This can be used for polling. */ int prom_nbgetchar(void) { int i = -1; unsigned long flags; local_irq_save(flags); i = (*(romvec->pv_nbgetchar))(); local_irq_restore(flags); return i; /* Ugh, we could spin forever on unsupported proms ;( */ } /* Non blocking put character to console device, returns -1 if * unsuccessful. */ int prom_nbputchar(char c) { unsigned long flags; int i = -1; local_irq_save(flags); i = (*(romvec->pv_nbputchar))(c); local_irq_restore(flags); return i; /* Ugh, we could spin forever on unsupported proms ;( */ } /* Blocking version of get character routine above. */ char prom_getchar(void) { int character; while((character = prom_nbgetchar()) == -1) ; return (char) character; } /* Blocking version of put character routine above. */ void prom_putchar(char c) { while(prom_nbputchar(c) == -1) ; return; } /* Query for input device type */ #if 0 enum prom_input_device prom_query_input_device() { unsigned long flags; int st_p; char propb[64]; char *p; switch(prom_vers) { case PROM_V0: case PROM_V2: default: switch(*romvec->pv_stdin) { case PROMDEV_KBD: return PROMDEV_IKBD; case PROMDEV_TTYA: return PROMDEV_ITTYA; case PROMDEV_TTYB: return PROMDEV_ITTYB; default: return PROMDEV_I_UNK; }; case PROM_V3: case PROM_P1275: local_irq_save(flags); st_p = (*romvec->pv_v2devops.v2_inst2pkg)(*romvec->pv_v2bootargs.fd_stdin); __asm__ __volatile__("ld [%0], %%g6\n\t" : : "r" (¤t_set[smp_processor_id()]) : "memory"); local_irq_restore(flags); if(prom_node_has_property(st_p, "keyboard")) return PROMDEV_IKBD; prom_getproperty(st_p, "device_type", propb, sizeof(propb)); if(strncmp(propb, "serial", sizeof("serial"))) return PROMDEV_I_UNK; prom_getproperty(prom_root_node, "stdin-path", propb, sizeof(propb)); p = propb; while(*p) p++; p -= 2; if(p[0] == ':') { if(p[1] == 'a') return PROMDEV_ITTYA; else if(p[1] == 'b') return PROMDEV_ITTYB; } return PROMDEV_I_UNK; }; } #endif /* Query for output device type */ #if 0 enum prom_output_device prom_query_output_device() { unsigned long flags; int st_p; char propb[64]; char *p; int propl; switch(prom_vers) { case PROM_V0: switch(*romvec->pv_stdin) { case PROMDEV_SCREEN: return PROMDEV_OSCREEN; case PROMDEV_TTYA: return PROMDEV_OTTYA; case PROMDEV_TTYB: return PROMDEV_OTTYB; }; break; case PROM_V2: case PROM_V3: case PROM_P1275: local_irq_save(flags); st_p = (*romvec->pv_v2devops.v2_inst2pkg)(*romvec->pv_v2bootargs.fd_stdout); __asm__ __volatile__("ld [%0], %%g6\n\t" : : "r" (¤t_set[smp_processor_id()]) : "memory"); local_irq_restore(flags); propl = prom_getproperty(st_p, "device_type", propb, sizeof(propb)); if (propl >= 0 && propl == sizeof("display") && strncmp("display", propb, sizeof("display")) == 0) { return PROMDEV_OSCREEN; } if(prom_vers == PROM_V3) { if(strncmp("serial", propb, sizeof("serial"))) return PROMDEV_O_UNK; prom_getproperty(prom_root_node, "stdout-path", propb, sizeof(propb)); p = propb; while(*p) p++; p -= 2; if(p[0]==':') { if(p[1] == 'a') return PROMDEV_OTTYA; else if(p[1] == 'b') return PROMDEV_OTTYB; } return PROMDEV_O_UNK; } else { /* This works on SS-2 (an early OpenFirmware) still. */ switch(*romvec->pv_stdin) { case PROMDEV_TTYA: return PROMDEV_OTTYA; case PROMDEV_TTYB: return PROMDEV_OTTYB; }; } break; }; return PROMDEV_O_UNK; } #endif |