cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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console.c (4014B)

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