diff options
Diffstat (limited to 'sys/arch/i386/boot/io.c')
| -rw-r--r-- | sys/arch/i386/boot/io.c | 93 |
1 files changed, 68 insertions, 25 deletions
diff --git a/sys/arch/i386/boot/io.c b/sys/arch/i386/boot/io.c index 0fdd7cabd50..30324242c19 100644 --- a/sys/arch/i386/boot/io.c +++ b/sys/arch/i386/boot/io.c @@ -1,4 +1,4 @@ -/* $NetBSD: io.c,v 1.17 1995/03/12 00:11:00 mycroft Exp $ */ +/* $NetBSD: io.c,v 1.18 1995/12/23 17:21:26 perry Exp $ */ /* * Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992 @@ -31,6 +31,15 @@ #include <sys/types.h> #include <machine/pio.h> +void gateA20 __P((int on)); +/*void printf __P((const char *format, int data));*/ /* not quite right XXX */ +void putchar __P((int c)); +int gets __P((char *buf)); +int strcmp __P((const char *s1, const char *s2)); +void bcopy __P((char *from, char *to, int len)); +int awaitkey __P((int seconds)); +void twiddle __P((void)); + #define K_RDWR 0x60 /* keyboard data & cmds (read/write) */ #define K_STATUS 0x64 /* keyboard status */ #define K_CMD 0x64 /* keybd ctlr command (write-only) */ @@ -48,6 +57,7 @@ /* * Gate A20 for high memory */ +void gateA20(on) int on; { @@ -74,9 +84,9 @@ gateA20(on) } /* printf - only handles %d as decimal, %c as char, %s as string */ - +void printf(format, data) - char *format; + const char *format; int data; { int *dataptr = &data; @@ -124,6 +134,7 @@ printf(format, data) } } +void putchar(c) int c; { @@ -132,37 +143,37 @@ putchar(c) putc(c); } +int gets(buf) char *buf; { - int i; char *ptr = buf; - for (i = 240000; i > 0; i--) - if (ischar()) - for (;;) { - register int c = getc(); - if (c == '\n' || c == '\r') { - putchar('\n'); - *ptr = '\0'; - return 1; - } else if (c == '\b' || c == '\177') { - if (ptr > buf) { - putchar('\b'); - putchar(' '); - putchar('\b'); - ptr--; - } - } else { - putchar(c); - *ptr++ = c; - } + for (;;) { + register int c = getc(); + if (c == '\n' || c == '\r') { + putchar('\n'); + *ptr = '\0'; + return 1; + } else if (c == '\b' || c == '\177') { + if (ptr > buf) { + putchar('\b'); + putchar(' '); + putchar('\b'); + ptr--; } - return 0; + } else { + putchar(c); + *ptr++ = c; + } + } + + /* shouldn't ever be reached; we have to return in the loop. */ } +int strcmp(s1, s2) - char *s1, *s2; + const char *s1, *s2; { while (*s1 == *s2) { if (!*s1++) @@ -172,6 +183,7 @@ strcmp(s1, s2) return 1; } +void bcopy(from, to, len) char *from, *to; int len; @@ -187,6 +199,37 @@ bcopy(from, to, len) } } +/* Number of milliseconds to sleep during each microsleep */ +#define NAPTIME 50 + +/* + * awaitkey takes a number of seconds to wait for a key to be + * struck. If a key is struck during the period, it returns true, else + * it returns false. It returns (nearly) as soon as the key is + * hit. Note that it does something only slightly smarter than busy waiting. + */ +int +awaitkey(seconds) + int seconds; +{ + int i; + + /* + * We sleep for brief periods (typically 50 milliseconds, set + * by NAPTIME), polling the input buffer at the end of + * each period. + */ + for (i = ((seconds*1000)/NAPTIME); i > 0; i--) { + /* multiply by 1000 to get microseconds. */ + usleep(NAPTIME*1000); + if (ischar()) + break; + } + + /* If a character was hit, "i" will still be non-zero. */ + return (i != 0); +} + void twiddle() { |