1 // SPDX-License-Identifier: GPL-2.0
5 static void udelay(int loops)
8 io_delay(); /* Approximately 1 us */
11 static void beep(unsigned int hz)
16 enable = 0x00; /* Turn off speaker */
20 outb(0xb6, 0x43); /* Ctr 2, squarewave, load, binary */
22 outb(div, 0x42); /* LSB of counter */
24 outb(div >> 8, 0x42); /* MSB of counter */
27 enable = 0x03; /* Turn on speaker */
29 inb(0x61); /* Dummy read of System Control Port B */
31 outb(enable, 0x61); /* Enable timer 2 output to speaker */
37 #define US_PER_DOT 125000
39 /* Okay, this is totally silly, but it's kind of fun. */
40 static void send_morse(const char *pattern)
44 while ((s = *pattern++)) {
54 udelay(US_PER_DOT * 3);
58 default: /* Assume it's a space */
59 udelay(US_PER_DOT * 3);
67 /* Kill machine if structures are wrong */
68 if (wakeup_header.real_magic != 0x12345678)
72 if (wakeup_header.realmode_flags & 4)
75 if (wakeup_header.realmode_flags & 1)
76 asm volatile("lcallw $0xc000,$3");
78 if (wakeup_header.realmode_flags & 2) {
79 /* Need to call BIOS */
81 set_mode(wakeup_header.video_mode);