forked from Imagelibrary/rtems
ab97ea6443
Use the idle stack to buffer early uses of printk(). Print the buffered characters during initialization when the UART is available and before the idle stack is used normally. This fix relates to a Coverity issue (PW.SET_BUT_NOT_USED).
126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
/*
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* This file contains the TTY driver for the serial ports on the LEON.
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*
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* This driver uses the termios pseudo driver.
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* Modified for LEON3 BSP.
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* COPYRIGHT (c) 2011.
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* Aeroflex Gaisler.
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <bsp.h>
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#include <leon.h>
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#include <rtems/bspIo.h>
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#include <rtems/sysinit.h>
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#include <rtems/score/thread.h>
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#include <grlib/apbuart.h>
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int leon3_debug_uart_index __attribute__((weak)) = 0;
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struct apbuart_regs *leon3_debug_uart = NULL;
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/*
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* Before UART driver is available, use the idle stack to buffer early uses of
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* printk().
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*/
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static size_t bsp_debug_uart_pre_init_buf_index;
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static void bsp_debug_uart_pre_init_out(char c)
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{
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size_t i;
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i = bsp_debug_uart_pre_init_buf_index;
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if (i < _Thread_Idle_stack_size) {
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bsp_debug_uart_pre_init_buf_index = i + 1;
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_Thread_Idle_stacks[i] = c;
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}
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}
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static void bsp_debug_uart_discard(char c)
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{
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(void) c;
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}
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static void bsp_debug_uart_output_char(char c)
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{
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apbuart_outbyte_polled(leon3_debug_uart, c, 1, 1);
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}
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static int bsp_debug_uart_poll_char(void)
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{
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return apbuart_inbyte_nonblocking(leon3_debug_uart);
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}
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/* Initialize the BSP system debug console layer. It will scan AMBA Plu&Play
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* for a debug APBUART and enable RX/TX for that UART.
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*/
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static void bsp_debug_uart_init(void)
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{
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int i;
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struct ambapp_dev *adev;
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struct ambapp_apb_info *apb;
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/* Update leon3_debug_uart_index to index used as debug console. Let user
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* select Debug console by setting leon3_debug_uart_index. If the BSP is to
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* provide the default UART (leon3_debug_uart_index==0):
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* non-MP: APBUART[0] is debug console
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* MP: LEON CPU index select UART
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*/
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if (leon3_debug_uart_index == 0) {
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#if defined(RTEMS_MULTIPROCESSING)
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leon3_debug_uart_index = LEON3_Cpu_Index;
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#else
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leon3_debug_uart_index = 0;
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#endif
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} else {
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leon3_debug_uart_index--; /* User selected dbg-console */
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}
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/* Find APBUART core for System Debug Console */
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i = leon3_debug_uart_index;
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adev = (void *)ambapp_for_each(&ambapp_plb, (OPTIONS_ALL|OPTIONS_APB_SLVS),
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VENDOR_GAISLER, GAISLER_APBUART,
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ambapp_find_by_idx, (void *)&i);
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if (adev != NULL) {
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size_t i;
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size_t n;
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/*
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* Found a matching debug console, initialize debug UART if present for
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* printk().
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*/
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apb = (struct ambapp_apb_info *)adev->devinfo;
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leon3_debug_uart = (struct apbuart_regs *)apb->start;
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leon3_debug_uart->ctrl |= APBUART_CTRL_RE | APBUART_CTRL_TE;
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leon3_debug_uart->status = 0;
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BSP_poll_char = bsp_debug_uart_poll_char;
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BSP_output_char = bsp_debug_uart_output_char;
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n = bsp_debug_uart_pre_init_buf_index;
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for (i = 0; i < n; ++i) {
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rtems_putc(_Thread_Idle_stacks[i]);
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}
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} else {
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BSP_output_char = bsp_debug_uart_discard;
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}
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}
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RTEMS_SYSINIT_ITEM(
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bsp_debug_uart_init,
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RTEMS_SYSINIT_BSP_START,
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RTEMS_SYSINIT_ORDER_FOURTH
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);
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BSP_output_char_function_type BSP_output_char = bsp_debug_uart_pre_init_out;
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BSP_polling_getchar_function_type BSP_poll_char;
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