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https://github.com/edk2-porting/linux-next.git
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1349ea08e8
Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: David S. Miller <davem@davemloft.net>
98 lines
2.0 KiB
C
98 lines
2.0 KiB
C
/*
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* console.c: Routines that deal with sending and receiving IO
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* to/from the current console device using the PROM.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1998 Pete Zaitcev <zaitcev@yahoo.com>
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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#include <asm/system.h>
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#include <linux/string.h>
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extern void restore_current(void);
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/* Non blocking get character from console input device, returns -1
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* if no input was taken. This can be used for polling.
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*/
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int
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prom_nbgetchar(void)
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{
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static char inc;
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int i = -1;
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unsigned long flags;
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spin_lock_irqsave(&prom_lock, flags);
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switch(prom_vers) {
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case PROM_V0:
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i = (*(romvec->pv_nbgetchar))();
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break;
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case PROM_V2:
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case PROM_V3:
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if( (*(romvec->pv_v2devops).v2_dev_read)(*romvec->pv_v2bootargs.fd_stdin , &inc, 0x1) == 1) {
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i = inc;
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} else {
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i = -1;
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}
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break;
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default:
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i = -1;
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break;
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};
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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return i; /* Ugh, we could spin forever on unsupported proms ;( */
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}
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/* Non blocking put character to console device, returns -1 if
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* unsuccessful.
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*/
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int
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prom_nbputchar(char c)
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{
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static char outc;
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unsigned long flags;
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int i = -1;
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spin_lock_irqsave(&prom_lock, flags);
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switch(prom_vers) {
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case PROM_V0:
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i = (*(romvec->pv_nbputchar))(c);
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break;
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case PROM_V2:
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case PROM_V3:
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outc = c;
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if( (*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout, &outc, 0x1) == 1)
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i = 0;
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else
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i = -1;
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break;
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default:
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i = -1;
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break;
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};
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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return i; /* Ugh, we could spin forever on unsupported proms ;( */
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}
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/* Blocking version of get character routine above. */
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char
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prom_getchar(void)
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{
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int character;
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while((character = prom_nbgetchar()) == -1) ;
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return (char) character;
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}
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/* Blocking version of put character routine above. */
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void
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prom_putchar(char c)
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{
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while(prom_nbputchar(c) == -1) ;
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}
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