Date: Fri, 9 May 2003 15:12:29 -0400 From: Jung-uk Kim <jkim@niksun.com> To: freebsd-hackers@freebsd.org Cc: imp@freebsd.org Subject: Re: boot2 keyboard probing problem (with patch) Message-ID: <200305091512.29995.jkim@niksun.com> In-Reply-To: <200305091456.40582.jkim@niksun.com> References: <200305091456.40582.jkim@niksun.com>
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It seems the attachment was removed by Mailman. Grrr...
Jung-uk Kim
--- src/sys/boot/i386/boot2/boot2.c.old Thu Oct 10 11:53:24 2002
+++ src/sys/boot/i386/boot2/boot2.c Fri May 9 03:45:46 2003
@@ -414,7 +414,64 @@
opts ^= 1 << flags[i];
}
if (opts & 1 << RBX_PROBEKBD) {
- i = *(uint8_t *)PTOV(0x496) & 0x10;
+ __asm __volatile (
+ "\n\tmovb $2, %%ah\n\t" /* Wait for empty input buffer */
+ "call wait\n\t" /* if %ah is 2 */
+ "jmp flush\n"
+ "wait:\n\t" /* Wait for a buffer status */
+ "xorw %%cx, %%cx\n" /* Initialize retry */
+ "loop1:\n\t"
+ "decw %%cx\n\t" /* retry = 0xffff and retry-- */
+ "jz exit1\n\t" /* Exit if retry is 0 */
+ "inb $0x64, %%al\n\t" /* Check controller status */
+ "testb $1, %%ah\n\t" /* Check output buffer status */
+ "jnz output\n\t" /* if %ah is 1 */
+ "testb %%ah, %%al\n\t" /* Input buffer empty? */
+ "jz exit1\n\t" /* Exit if input buffer empty */
+ "jmp delay\n" /* else delay */
+ "output:\n\t"
+ "testb %%ah, %%al\n\t" /* Output buffer full? */
+ "jnz exit1\n" /* Exit if output buffer full */
+ "delay:\n\t"
+ "xorb %%al, %%al\n\t" /* XXX delay hack */
+ "outb %%al, $0x80\n\t" /* Send 0 to port 0x80 (POST) */
+ "jmp loop1\n" /* Retry */
+ "exit1:\n\t"
+ "ret\n"
+ "flush:\n\t"
+ "movw $2001, %%cx\n" /* Initialize retry */
+ "loop2:\n\t"
+ "decw %%cx\n\t" /* retry = 2000 and retry-- */
+ "jz exit2\n\t" /* Exit if retry is 0 */
+ "xorb %%al, %%al\n\t" /* XXX delay hack */
+ "outb %%al, $0x80\n\t" /* Send 0 to port 0x80 (POST) */
+ "inb $0x64, %%al\n\t" /* Check controller status */
+ "testb $1, %%al\n\t" /* Any character to flush? */
+ "jz loop2\n\t" /* Retry if buffer is empty */
+ "inb $0x60, %%al\n\t" /* Flush a character from buffer */
+ "movw $2001, %%cx\n\t" /* Reinitialize retry */
+ "jmp loop2\n" /* Retry */
+ "exit2:\n\t"
+ "movb $0xee, %%al\n\t" /* Set echo command */
+ "outb %%al, $0x60\n\t" /* Send it! */
+ "movb $2, %%ah\n\t" /* Wait for echo to be sent */
+ "call wait\n\t"
+ "andw %%cx, %%cx\n\t" /* Is retry 0? */
+ "jz fail\n\t" /* Echo not sent */
+ "movb $1, %%ah\n\t" /* Wait for a character */
+ "call wait\n\t"
+ "andw %%cx, %%cx\n\t" /* Is retry 0? */
+ "jz fail\n\t" /* A character not received */
+ "inb $0x60, %%al\n\t" /* Receive a character */
+ "cmpb $0xee, %%al\n\t" /* Is this an echo? */
+ "jne fail\n\t" /* Fail if echo not received */
+ "movl $1, %0\n\t" /* Set return code = 1 */
+ "jmp fine\n" /* and exit */
+ "fail:\n\t"
+ "movl $0, %0\n" /* Set return code = 0 */
+ "fine:\n" /* and exit */
+ : "=r" (i) : : "ah", "al", "cx"
+ );
printf("Keyboard: %s\n", i ? "yes" : "no");
if (!i)
opts |= 1 << RBX_DUAL | 1 << RBX_SERIAL;
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