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#include <cpu.h>
#include <lib.h>
#include <log.h>
#include <pnc.h>
/**
* Formatting
*/
static u32 vsnprintf(char *str, u32 size, const char *format, va_list ap)
{
u32 length = 0;
int temp_int;
char temp_ch;
char *temp_str;
char buffer[64] = { 0 };
// TODO: Fix potential memory overflows because of str[length++]=xxx
char ch;
while ((ch = *format++)) {
if (ch == '%') {
switch (*format++) {
case '%':
str[length++] = '%';
break;
case 'c':
temp_ch = va_arg(ap, int);
str[length++] = temp_ch;
break;
case 's':
temp_str = va_arg(ap, char *);
length += strlcpy(&str[length], temp_str, size - length);
break;
case 'b':
temp_int = va_arg(ap, int);
itoa(temp_int, buffer, 2);
length += strlcpy(&str[length], buffer, size - length);
break;
case 'd':
temp_int = va_arg(ap, int);
itoa(temp_int, buffer, 10);
length += strlcpy(&str[length], buffer, size - length);
break;
case 'x':
temp_int = va_arg(ap, int);
itoa(temp_int, buffer, 16);
length += strlcpy(&str[length], buffer, size - length);
break;
default:
serial_print("Unknown printf format\n");
}
} else {
str[length++] = ch;
}
}
return length;
}
/**
* Serial
*/
#define PORT 0x3f8
void serial_install(void)
{
outb(PORT + 1, 0x00);
outb(PORT + 3, 0x80);
outb(PORT + 0, 0x03);
outb(PORT + 1, 0x00);
outb(PORT + 3, 0x03);
outb(PORT + 2, 0xc7);
// Test serial chip
outb(PORT + 4, 0x1e); // Enable loopback
outb(PORT + 0, 0xae); // Write
assert(inb(PORT + 0) == 0xae); // Verify receive
// Activate
outb(PORT + 4, 0x0f);
log("[LOG] Initiated\n");
}
static int serial_empty(void)
{
return inb(PORT + 5) & 0x20;
}
static void serial_put(char ch)
{
while (serial_empty() == 0)
;
outb(PORT, (u8)ch);
}
void serial_print(const char *data)
{
for (const char *p = data; *p; p++)
serial_put(*p);
}
/**
* VGA
*/
#define VGA_WIDTH 80
#define VGA_HEIGHT 25
#define VGA_ADDRESS 0xb8000
void vga_clear(void)
{
u16 *out = (u16 *)VGA_ADDRESS;
for (u16 i = 0; i < 80 * 25; i++)
out[i] = 0;
}
static void vga_put(char ch)
{
static u8 x = 0;
static u8 y = 0;
if (ch == '\n') {
x = 0;
y++;
return;
} else if (x + 1 == VGA_WIDTH) {
x = 0;
y++;
} else if (y + 1 == VGA_HEIGHT) {
x = 0;
y = 0;
vga_clear();
}
u8 *out = (u8 *)(VGA_ADDRESS + 2 * (x + y * VGA_WIDTH));
*out++ = ch;
*out++ = 0x07;
x++;
}
static void vga_print(const char *data)
{
for (const char *p = data; *p; p++)
vga_put(*p);
}
/**
* Universal print function
*/
void log(const char *format, ...)
{
char buf[1024] = { 0 };
va_list ap;
va_start(ap, format);
vsnprintf(buf, sizeof(buf), format, ap);
va_end(ap);
serial_print(buf);
vga_print(buf);
}
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