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IOPL, VM, and serial debug output (disabled).

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This commit is contained in:
Philip Homburg
2005-09-30 12:54:59 +00:00
parent 9528152f68
commit 9bee3f4b08
13 changed files with 416 additions and 5 deletions
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24
kernel/utility.c
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@@ -23,6 +23,7 @@
#define END_OF_KMESS -1
FORWARD _PROTOTYPE(void kputc, (int c));
FORWARD _PROTOTYPE( void ser_putc, (char c));
/*===========================================================================*
* panic *
@@ -130,6 +131,8 @@ int c; /* character to append */
* the to output driver if an END_OF_KMESS is encountered.
*/
if (c != END_OF_KMESS) {
if (do_serial_debug)
ser_putc(c);
kmess.km_buf[kmess.km_next] = c; /* put normal char in buffer */
if (kmess.km_size < KMESS_BUF_SIZE)
kmess.km_size += 1;
@@ -139,3 +142,24 @@ int c; /* character to append */
}
}
#define COM1_BASE 0x3F8
#define COM1_THR (COM1_BASE + 0)
#define LSR_THRE 0x20
#define COM1_LSR (COM1_BASE + 5)
PRIVATE void ser_putc(char c)
{
int i;
int lsr, thr;
return;
lsr= COM1_LSR;
thr= COM1_THR;
for (i= 0; i<100000; i++)
{
if (inb(lsr) & LSR_THRE)
break;
}
outb(thr, c);
}