blob: 6a164e1e6a0707aa6a9302862434847a43138441 [file] [log] [blame]
// Raw screen writing and debug output code.
//
// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include <stdarg.h> // va_list
#include "farptr.h" // GET_VAR
#include "util.h" // printf
#include "bregs.h" // struct bregs
#include "config.h" // CONFIG_*
#include "biosvar.h" // GET_GLOBAL
#define DEBUG_PORT PORT_SERIAL1
#define DEBUG_TIMEOUT 100000
void
debug_serial_setup()
{
if (!CONFIG_DEBUG_SERIAL)
return;
// setup for serial logging: 8N1
u8 oldparam, newparam = 0x03;
oldparam = inb(DEBUG_PORT+SEROFF_LCR);
outb(newparam, DEBUG_PORT+SEROFF_LCR);
// Disable irqs
u8 oldier, newier = 0;
oldier = inb(DEBUG_PORT+SEROFF_IER);
outb(newier, DEBUG_PORT+SEROFF_IER);
if (oldparam != newparam || oldier != newier)
dprintf(1, "Changing serial settings was %x/%x now %x/%x\n"
, oldparam, oldier, newparam, newier);
}
// Write a character to the serial port.
static void
debug_serial(char c)
{
if (!CONFIG_DEBUG_SERIAL)
return;
int timeout = DEBUG_TIMEOUT;
while ((inb(DEBUG_PORT+SEROFF_LSR) & 0x60) != 0x60)
if (!timeout--)
// Ran out of time.
return;
outb(c, DEBUG_PORT+SEROFF_DATA);
}
// Make sure all serial port writes have been completely sent.
static void
debug_serial_flush()
{
if (!CONFIG_DEBUG_SERIAL)
return;
int timeout = DEBUG_TIMEOUT;
while ((inb(DEBUG_PORT+SEROFF_LSR) & 0x40) != 0x40)
if (!timeout--)
// Ran out of time.
return;
}
// Show a character on the screen.
static void
screenc(u8 c)
{
if (MODE16)
// printf is only used in 32bit code.
return;
struct bregs br;
memset(&br, 0, sizeof(br));
br.ah = 0x0e;
br.al = c;
call16_int(0x10, &br);
}
// Output a character.
static void
putc(u16 action, char c)
{
if (CONFIG_DEBUG_LEVEL && (CONFIG_SCREEN_AND_DEBUG || !action)) {
if (! CONFIG_COREBOOT)
// Send character to debug port.
outb(c, PORT_BIOS_DEBUG);
// Send character to serial port.
if (c == '\n')
debug_serial('\r');
debug_serial(c);
}
if (action) {
// Send character to video screen.
if (c == '\n')
screenc('\r');
screenc(c);
}
}
// Ouptut a string.
static void
puts(u16 action, const char *s)
{
for (; *s; s++)
putc(action, *s);
}
// Output a string that is in the CS segment.
static void
puts_cs(u16 action, const char *s)
{
for (;; s++) {
char c = GET_GLOBAL(*(u8*)s);
if (!c)
break;
putc(action, c);
}
}
// Output an unsigned integer.
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);
}
// Output a single digit hex character.
static inline void
putsinglehex(u16 action, u32 val)
{
if (val <= 9)
val = '0' + val;
else
val = 'a' + val - 10;
putc(action, val);
}
// Output an integer in hexadecimal.
static void
puthex(u16 action, u32 val, int width)
{
if (!width) {
u32 tmp = val;
width = 1;
if (tmp > 0xffff) {
width += 4;
tmp >>= 16;
}
if (tmp > 0xff) {
width += 2;
tmp >>= 8;
}
if (tmp > 0xf)
width += 1;
}
switch (width) {
default: putsinglehex(action, (val >> 28) & 0xf);
case 7: putsinglehex(action, (val >> 24) & 0xf);
case 6: putsinglehex(action, (val >> 20) & 0xf);
case 5: putsinglehex(action, (val >> 16) & 0xf);
case 4: putsinglehex(action, (val >> 12) & 0xf);
case 3: putsinglehex(action, (val >> 8) & 0xf);
case 2: putsinglehex(action, (val >> 4) & 0xf);
case 1: putsinglehex(action, (val >> 0) & 0xf);
}
}
static inline int
isdigit(u8 c)
{
return ((u8)(c - '0')) < 10;
}
static void
bvprintf(u16 action, const char *fmt, va_list args)
{
const char *s = fmt;
for (;; s++) {
char c = GET_GLOBAL(*(u8*)s);
if (!c)
break;
if (c != '%') {
putc(action, c);
continue;
}
const char *n = s+1;
int field_width = 0;
for (;;) {
c = GET_GLOBAL(*(u8*)n);
if (!isdigit(c))
break;
field_width = field_width * 10 + c - '0';
n++;
}
if (c == 'l') {
// Ignore long format indicator
n++;
c = GET_GLOBAL(*(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 'p':
/* %p always has 0x prepended */
putc(action, '0');
putc(action, 'x');
field_width = 8;
case 'x':
val = va_arg(args, s32);
puthex(action, val, field_width);
break;
case 'c':
val = va_arg(args, int);
putc(action, val);
break;
case '.':
// Hack to support "%.s" - meaning string on stack.
if (GET_GLOBAL(*(u8*)(n+1)) != 's')
break;
n++;
sarg = va_arg(args, const char *);
puts(action, sarg);
break;
case 's':
sarg = va_arg(args, const char *);
puts_cs(action, sarg);
break;
default:
putc(action, '%');
n = s;
}
s = n;
}
debug_serial_flush();
}
void
panic(const char *fmt, ...)
{
if (CONFIG_DEBUG_LEVEL) {
va_list args;
va_start(args, fmt);
bvprintf(0, fmt, args);
va_end(args);
}
// XXX - use PANIC PORT.
irq_disable();
for (;;)
hlt();
}
void
__dprintf(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
bvprintf(0, fmt, args);
va_end(args);
}
void
printf(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
bvprintf(1, fmt, args);
va_end(args);
}
void
hexdump(void *d, int len)
{
int count=0;
while (len) {
if (count % 8 == 0) {
putc(0, '\n');
puthex(0, count*4, 8);
putc(0, ':');
} else {
putc(0, ' ');
}
puthex(0, *(u32*)d, 8);
count++;
len-=4;
d+=4;
}
putc(0, '\n');
debug_serial_flush();
}
static void
dump_regs(struct bregs *regs)
{
if (!regs) {
dprintf(1, " NULL\n");
return;
}
dprintf(1, " a=%08x b=%08x c=%08x d=%08x ds=%04x es=%04x ss=%04x\n"
, regs->eax, regs->ebx, regs->ecx, regs->edx
, regs->ds, regs->es, GET_SEG(SS));
dprintf(1, " si=%08x di=%08x bp=%08x sp=%08x cs=%04x ip=%04x f=%04x\n"
, regs->esi, regs->edi, regs->ebp, (u32)&regs[1]
, regs->code.seg, regs->code.offset, regs->flags);
}
// Report entry to an Interrupt Service Routine (ISR).
void
__debug_isr(const char *fname)
{
puts_cs(0, fname);
putc(0, '\n');
debug_serial_flush();
}
// Function called on handler startup.
void
__debug_enter(struct bregs *regs, const char *fname)
{
dprintf(1, "enter %s:\n", fname);
dump_regs(regs);
}
// Send debugging output info.
void
__debug_stub(struct bregs *regs, int lineno, const char *fname)
{
dprintf(1, "stub %s:%d:\n", fname, lineno);
dump_regs(regs);
}
// Report on a handler returning a failure notification to the caller.
void
__set_fail(struct bregs *regs, int lineno, const char *fname)
{
dprintf(1, "fail %s:%d:\n", fname, lineno);
dump_regs(regs);
set_fail_silent(regs);
}
// Report on a handler returning a failure code to the caller. Note,
// the lineno and return code are encoded in the same parameter as gcc
// does a better job of scheduling function calls when there are 3 or
// less parameters.
void
__set_code_fail(struct bregs *regs, u32 linecode, const char *fname)
{
u8 code = linecode;
u32 lineno = linecode >> 8;
dprintf(1, "fail %s:%d(%x):\n", fname, lineno, code);
dump_regs(regs);
set_code_fail_silent(regs, code);
}