/* Minimal NS16550A UART helpers for the QEMU virt machine. */
#ifndef GE_UART_H
#define GE_UART_H

typedef unsigned char u8;
typedef unsigned int u32;
typedef unsigned long u64;
typedef long i64;

#define UART0_BASE 0x10000000UL
#define UART_THR   (UART0_BASE + 0x00)
#define UART_LSR   (UART0_BASE + 0x05)

static inline void uart_putc(char c)
{
    volatile u8 *lsr = (volatile u8 *)UART_LSR;
    while ((*lsr & 0x20) == 0) {
        /* wait for THR empty */
    }
    *(volatile u8 *)UART_THR = (u8)c;
}

static inline void uart_puts(const char *s)
{
    while (*s) {
        uart_putc(*s++);
    }
}

static inline void uart_hex(u64 value, int digits)
{
    static const char hex[] = "0123456789abcdef";
    for (int i = (digits - 1) * 4; i >= 0; i -= 4) {
        uart_putc(hex[(value >> i) & 0xf]);
    }
}

#endif /* GE_UART_H */