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// Raw screen writing code.
//
// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <stdarg.h> // va_list
#include "farptr.h" // GET_VAR
#include "util.h" // bprintf
#include "biosvar.h" // struct bregs
static void
screenc(u8 c)
{
struct bregs br;
memset(&br, 0, sizeof(br));
br.ah = 0x0e;
br.al = c;
call16_int(0x10, &br);
}
// XXX
#define PORT_DEBUG 0x403
// Write a charcter to the framebuffer.
static void
putc(u16 action, char c)
{
outb(c, PORT_DEBUG);
if (action) {
if (c == '\n')
screenc('\r');
screenc(c);
}
}
// Write a string to the framebuffer.
static void
puts(u16 action, const char *s)
{
for (; *s; s++)
putc(action, *s);
}
// Write a string to the framebuffer.
static void
puts_cs(u16 action, const char *s)
{
for (;; s++) {
char c = GET_VAR(CS, (u8)*s);
if (!c)
break;
putc(action, c);
}
}
// Write an unsigned integer to the screen.
static void
putuint(u16 action, u32 val)
{
char buf[12];
char *d = &buf[sizeof(buf) - 1];
*d-- = '\0';
for (;;) {
*d = (val % 10) + '0';
val /= 10;
if (!val)
break;
d--;
}
puts(action, d);
}
// Write a single digit hex character to the screen.
static inline void
putsinglehex(u16 action, u32 val)
{
if (val <= 9)
val = '0' + val;
else
val = 'a' + val - 10;
putc(action, val);
}
// Write an integer in hexadecimal to the screen.
static void
puthex(u16 action, u32 val)
{
putsinglehex(action, (val >> 28) & 0xf);
putsinglehex(action, (val >> 24) & 0xf);
putsinglehex(action, (val >> 20) & 0xf);
putsinglehex(action, (val >> 16) & 0xf);
putsinglehex(action, (val >> 12) & 0xf);
putsinglehex(action, (val >> 8) & 0xf);
putsinglehex(action, (val >> 4) & 0xf);
putsinglehex(action, (val >> 0) & 0xf);
}
void
bprintf(u16 action, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
const char *s = fmt;
for (;; s++) {
char c = GET_VAR(CS, (u8)*s);
if (!c)
break;
if (c != '%') {
putc(action, c);
continue;
}
const char *n = s+1;
c = GET_VAR(CS, (u8)*n);
s32 val;
const char *sarg;
switch (c) {
case '%':
putc(action, '%');
break;
case 'd':
val = va_arg(args, s32);
if (val < 0) {
putc(action, '-');
val = -val;
}
putuint(action, val);
break;
case 'u':
val = va_arg(args, s32);
putuint(action, val);
break;
case 'x':
val = va_arg(args, s32);
puthex(action, val);
break;
case 'c':
val = va_arg(args, int);
putc(action, val);
break;
case 's':
sarg = va_arg(args, const char *);
puts_cs(action, sarg);
break;
default:
putc(action, '%');
n = s;
}
s = n;
}
va_end(args);
}
static void
dump_regs(const char *fname, const char *type, struct bregs *regs)
{
if (!regs) {
bprintf(0, "%s %s: NULL\n", type, fname);
return;
}
bprintf(0, "%s %s: a=%x b=%x c=%x d=%x si=%x di=%x\n"
, type, fname, regs->eax, regs->ebx, regs->ecx, regs->edx
, regs->esi, regs->edi);
bprintf(0, " ds=%x es=%x bp=%x sp=%x ip=%x cs=%x f=%x\n"
, regs->ds, regs->es, regs->ebp, regs->esp
, regs->ip, regs->cs, regs->flags);
}
void
__debug_isr(const char *fname, struct bregs *regs)
{
puts_cs(0, fname);
putc(0, '\n');
}
// Function called on handler startup.
void
__debug_enter(const char *fname, struct bregs *regs)
{
// XXX - implement run time suppression test
dump_regs(fname, "enter", regs);
}
void
__debug_exit(const char *fname, struct bregs *regs)
{
if (! (regs->flags & F_CF))
return;
dump_regs(fname, "exit", regs);
}
void
__debug_stub(const char *fname, struct bregs *regs)
{
dump_regs(fname, "stub", regs);
}
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