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#include <stdarg.h>
#include <stddef.h>
#include "demo.h"
#define JTAG_UART_BASE 0x30000000
#define JTAG_UART_DATA (*(volatile unsigned *)(JTAG_UART_BASE + 0))
#define JTAG_UART_DATA_RVALID (1 << 15)
#define JTAG_UART_DATA_RAVAIL 0xffff0000
#define JTAG_UART_CONTROL (*(volatile unsigned *)(JTAG_UART_BASE + 4))
#define JTAG_UART_CONTROL_RE (1 << 0)
#define JTAG_UART_CONTROL_AC (1 << 10)
#define JTAG_UART_CONTROL_WSPACE 0xffff0000
#define INTC_BASE 0x30070000
#define INTC_MASK (*(volatile unsigned *)(INTC_BASE + 4))
#define INTC_MASK_TIMER (1 << 0)
#define INTC_MASK_UART (1 << 1)
static struct lock console_lock;
static int input_run = 0;
static unsigned input_len = 0;
static unsigned input_max;
static char *input_buf;
static void print_char(char c)
{
while (!(JTAG_UART_CONTROL & JTAG_UART_CONTROL_WSPACE));
JTAG_UART_DATA = (unsigned char)c;
}
static void print_str(const char *s)
{
while (*s)
print_char(*s++);
}
static void print_hex(unsigned val, unsigned bits)
{
static const char hex_digits[16] = "0123456789abcdef";
print_str("0x");
if (bits < 4)
bits = 4;
if (bits > 32)
bits = 32;
bits = (bits + 3) & ~3;
do
print_char(hex_digits[(val >> (bits -= 4)) & 0xf]);
while (bits);
}
static void print_dec(unsigned val)
{
char dec[11] = {'\0'};
char *next = dec;
do {
*next++ = '0' + val % 10;
val /= 10;
} while (val && next < dec + sizeof dec);
const char *c = next;
while (c > dec)
print_char(*--c);
}
void console_init(void)
{
spin_init(&console_lock);
input_buf = NULL;
input_max = 0;
// Habilitar irqs de entrada uart
JTAG_UART_CONTROL = JTAG_UART_CONTROL_RE;
// Habilitar irqs en controlador de interrupciones
INTC_MASK = INTC_MASK_UART;
// Habilitar irqs en core
asm volatile("msr cpsr_c, #0x53");
}
void print(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
unsigned irq_save;
spin_lock(&console_lock, &irq_save);
while (!(JTAG_UART_CONTROL & JTAG_UART_CONTROL_AC));
print_str("\r ");
for (unsigned i = 0; i < input_len; ++i)
print_char(' ');
print_str("\rcpu");
print_dec(this_cpu->num);
print_str(": ");
char c;
while ((c = *fmt++)) {
if (c != '%') {
print_char(c);
continue;
}
unsigned val;
switch ((c = *fmt++)) {
case 'c':
print_char((char)va_arg(args, int));
break;
case 'd':
case 'i':
print_dec((unsigned)va_arg(args, int));
break;
case 'p':
print_hex((unsigned)va_arg(args, const void *), 32);
break;
case 'r':
val = va_arg(args, unsigned);
print_hex(val, va_arg(args, unsigned));
break;
case 'u':
print_dec(va_arg(args, unsigned));
break;
case 's':
print_str(va_arg(args, const char *));
break;
case 'x':
print_hex(va_arg(args, unsigned), 32);
break;
default:
print_char('%');
if (c)
print_char(c);
break;
}
}
print_str("\r\n> ");
if (!input_run && input_buf)
print_str(input_buf);
JTAG_UART_CONTROL = JTAG_UART_CONTROL_RE | JTAG_UART_CONTROL_AC;
spin_unlock(&console_lock, irq_save);
va_end(args);
}
void read_line(char *buf, unsigned size)
{
if (!size)
return;
buf[0] = '\0';
unsigned irq_save;
spin_lock(&console_lock, &irq_save);
input_buf = buf;
input_max = size;
input_len = 0;
spin_unlock(&console_lock, irq_save);
while (1) {
spin_lock(&console_lock, &irq_save);
if (input_run)
break;
spin_unlock(&console_lock, irq_save);
}
input_buf = NULL;
input_len = 0;
input_max = 0;
input_run = 0;
spin_unlock(&console_lock, irq_save);
}
void irq(void)
{
unsigned irq_save;
spin_lock(&console_lock, &irq_save);
unsigned data;
do {
data = JTAG_UART_DATA;
if (!(data & JTAG_UART_DATA_RVALID))
break;
else if (input_run || !input_buf)
continue;
char c = (char)data;
switch (c) {
case 0x7f: // DEL
if (input_len > 0) {
input_buf[--input_len] = '\0';
print_str("\b \b");
}
break;
case '\n':
input_run = 1;
input_len = 0;
print_str("\r\n> ");
break;
default:
if (input_len < input_max - 1 && c >= ' ' && c <= '~') {
print_char(c);
input_buf[input_len++] = c;
input_buf[input_len] = '\0';
}
break;
}
} while (data & JTAG_UART_DATA_RAVAIL);
spin_unlock(&console_lock, irq_save);
}
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