/* -------------------------------------------

  Copyright (C) 2024, Amlal EL Mahrouss, all rights reserved.

------------------------------------------- */

#include <lib/boot.h>
#include <lib/string.h>

/// BUGS: 0

#define ARM64_MMIO_REG(addr) (*(volatile uint32_t*) (cb_uart_ptr + addr))

/* this file handles the UART */

static uint32_t* cb_uart_ptr = (uint32_t*) NB_UART_BASE;

/// @brief Retrieve character from cb_uart_ptr
utf_char_t cb_get_char(void) {
  while ((ARM64_MMIO_REG(0x018) & (1 << 4))) {
  }

  return (utf_char_t) ARM64_MMIO_REG(0x0) & 0xFF;
}

void cb_put_char(utf_char_t ch) {
  while ((ARM64_MMIO_REG(0x018) & (1 << 5))) {
  }

  ARM64_MMIO_REG(0x0) = ch;
}

/// @brief UART put string
/// @param text the input text.
size_t cb_put_string(const char* text) {
  if (text == nil) return 0;

  size_t i = 0;

  for (; i < strlen(text); i++) {
    cb_put_char(text[i]);
  }

  return i;
}