blob: 4bd2f534afeecb89082f2235554ba2ff3f459a0a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
/* 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 */
|
