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https://github.com/torvalds/linux.git
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82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
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#include "wakeup.h"
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#include "boot.h"
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static void udelay(int loops)
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{
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while (loops--)
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io_delay(); /* Approximately 1 us */
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}
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static void beep(unsigned int hz)
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{
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u8 enable;
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if (!hz) {
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enable = 0x00; /* Turn off speaker */
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} else {
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u16 div = 1193181/hz;
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outb(0xb6, 0x43); /* Ctr 2, squarewave, load, binary */
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io_delay();
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outb(div, 0x42); /* LSB of counter */
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io_delay();
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outb(div >> 8, 0x42); /* MSB of counter */
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io_delay();
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enable = 0x03; /* Turn on speaker */
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}
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inb(0x61); /* Dummy read of System Control Port B */
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io_delay();
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outb(enable, 0x61); /* Enable timer 2 output to speaker */
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io_delay();
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}
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#define DOT_HZ 880
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#define DASH_HZ 587
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#define US_PER_DOT 125000
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/* Okay, this is totally silly, but it's kind of fun. */
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static void send_morse(const char *pattern)
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{
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char s;
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while ((s = *pattern++)) {
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switch (s) {
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case '.':
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beep(DOT_HZ);
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udelay(US_PER_DOT);
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beep(0);
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udelay(US_PER_DOT);
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break;
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case '-':
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beep(DASH_HZ);
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udelay(US_PER_DOT * 3);
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beep(0);
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udelay(US_PER_DOT);
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break;
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default: /* Assume it's a space */
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udelay(US_PER_DOT * 3);
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break;
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}
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}
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}
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void main(void)
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{
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/* Kill machine if structures are wrong */
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if (wakeup_header.real_magic != 0x12345678)
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while (1);
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if (wakeup_header.realmode_flags & 4)
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send_morse("...-");
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if (wakeup_header.realmode_flags & 1)
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asm volatile("lcallw $0xc000,$3");
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if (wakeup_header.realmode_flags & 2) {
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/* Need to call BIOS */
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probe_cards(0);
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set_mode(wakeup_header.video_mode);
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}
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}
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