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send console output to parallel port

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This commit is contained in:
rtm 2006-06-22 15:51:57 +00:00
parent 8352b99801
commit bf49aedbed
2 changed files with 22 additions and 0 deletions
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3
Notes
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@ -1,3 +1,6 @@
bochs 2.2.6:
./configure --enable-smp --enable-disasm --enable-debugger --enable-all-optimizations --enable-4meg-pages --enable-global-pages --enable-pae --disable-reset-on-triple-fault
bootmain.c doesn't work right if the ELF sections aren't bootmain.c doesn't work right if the ELF sections aren't
sector-aligned. so you can't use ld -N. and the sections may also need sector-aligned. so you can't use ld -N. and the sections may also need
to be non-zero length, only really matters for tiny "kernels". to be non-zero length, only really matters for tiny "kernels".

19
console.c
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@ -2,6 +2,23 @@
#include <x86.h> #include <x86.h>
#include "defs.h" #include "defs.h"
/*
* copy console output to parallel port, which you can tell
* .bochsrc to copy to the stdout:
* parport1: enabled=1, file="/dev/stdout"
*/
static void
lpt_putc(int c)
{
int i;
for (i = 0; !(inb(0x378+1) & 0x80) && i < 12800; i++)
;
outb(0x378+0, c);
outb(0x378+2, 0x08|0x04|0x01);
outb(0x378+2, 0x08);
}
void void
cons_putc(int c) cons_putc(int c)
{ {
@ -9,6 +26,8 @@ cons_putc(int c)
unsigned short *crt = (unsigned short *) 0xB8000; // base of CGA memory unsigned short *crt = (unsigned short *) 0xB8000; // base of CGA memory
int ind; int ind;
lpt_putc(c);
// cursor position, 16 bits, col + 80*row // cursor position, 16 bits, col + 80*row
outb(crtport, 14); outb(crtport, 14);
ind = inb(crtport + 1) << 8; ind = inb(crtport + 1) << 8;