sel4-sys 0.0.28

Rust interface to the seL4 kernel
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/*
 * Copyright 2014, General Dynamics C4 Systems
 *
 * This software may be distributed and modified according to the terms of
 * the GNU General Public License version 2. Note that NO WARRANTY is provided.
 * See "LICENSE_GPLv2.txt" for details.
 *
 * @TAG(GD_GPL)
 */

#include <config.h>
#include <stdint.h>
#include <util.h>
#include <machine/io.h>
#include <plat/machine/devices.h>

#define UART_CONTROL                 0x00
#define UART_MODE                    0x04
#define UART_INTRPT_EN               0x08
#define UART_INTRPT_DIS              0x0C
#define UART_INTRPT_MASK             0x10
#define UART_CHNL_INT_STS            0x14
#define UART_BAUD_RATE_GEN           0x18
#define UART_RCVR_TIMEOUT            0x1C
#define UART_RCVR_FIFO_TRIGGER_LEVEL 0x20
#define UART_MODEM_CTRL              0x24
#define UART_MODEM_STS               0x28
#define UART_CHANNEL_STS             0x2C
#define UART_TX_RX_FIFO              0x30
#define UART_BAUD_RATE_DIVIDER       0x34
#define UART_FLOW_DELAY              0x38
#define UART_TX_FIFO_TRIGGER_LEVEL   0x44

#define UART_INTRPT_MASK_TXEMPTY     (1U << 3)
#define UART_CHANNEL_STS_TXEMPTY     (1U << 3)

#define UART_REG(x) ((volatile uint32_t *)(UART_PPTR + (x)))

#if defined(CONFIG_DEBUG_BUILD) || defined(CONFIG_PRINTING)
void
putDebugChar(unsigned char c)
{
    while (!(*UART_REG(UART_CHANNEL_STS) & UART_CHANNEL_STS_TXEMPTY));
    *UART_REG(UART_TX_RX_FIFO) = c;
}
#endif

#ifdef CONFIG_DEBUG_BUILD
unsigned char
getDebugChar(void)
{
    while (!(*UART_REG(UART_CHANNEL_STS) & BIT(UART_CHANNEL_STS_TXEMPTY)));
    return *UART_REG(UART_TX_RX_FIFO);
}
#endif /* CONFIG_DEBUG_BUILD */