source: rtems/c/src/lib/libbsp/powerpc/gen83xx/startup/bspstart.c @ b1e8a58

4.11
Last change on this file since b1e8a58 was b1e8a58, checked in by Sebastian Huber <sebastian.huber@…>, on Nov 14, 2012 at 8:57:55 AM

bsps/powerpc: Exception initialization error is fatal

  • Property mode set to 100644
File size: 3.5 KB
Line 
1/**
2 * @file
3 *
4 * @ingroup mpc83xx
5 *
6 * @brief Source for BSP startup code.
7 */
8
9/*
10 * Copyright (c) 2008
11 * Embedded Brains GmbH
12 * Obere Lagerstr. 30
13 * D-82178 Puchheim
14 * Germany
15 * rtems@embedded-brains.de
16 *
17 * The license and distribution terms for this file may be
18 * found in the file LICENSE in this distribution or at
19 * http://www.rtems.com/license/LICENSE.
20 */
21
22#include <libchip/serial.h>
23
24#include <libcpu/powerpc-utility.h>
25
26#include <bsp.h>
27#include <bsp/vectors.h>
28#include <bsp/bootcard.h>
29#include <bsp/irq-generic.h>
30#include <bsp/u-boot.h>
31
32/* Configuration parameters for console driver, ... */
33unsigned int BSP_bus_frequency;
34
35/* Configuration parameter for clock driver */
36uint32_t bsp_time_base_frequency;
37
38/* Legacy */
39uint32_t bsp_clicks_per_usec;
40
41/* Default decrementer exception handler */
42static int mpc83xx_decrementer_exception_handler( BSP_Exception_frame *frame, unsigned number)
43{
44  ppc_set_decrementer_register(UINT32_MAX);
45
46  return 0;
47}
48
49void BSP_panic(char *s)
50{
51  rtems_interrupt_level level;
52
53  rtems_interrupt_disable(level);
54
55  printk("%s PANIC %s\n", rtems_get_version_string(), s);
56
57  while (1) {
58    /* Do nothing */
59  }
60}
61
62void _BSP_Fatal_error(unsigned n)
63{
64  rtems_interrupt_level level;
65
66  rtems_interrupt_disable( level);
67
68  printk( "%s PANIC ERROR %u\n", rtems_get_version_string(), n);
69
70  while (1) {
71    /* Do nothing */
72  }
73}
74
75void bsp_start( void)
76{
77  rtems_status_code sc = RTEMS_SUCCESSFUL;
78  unsigned long i = 0;
79
80  ppc_cpu_id_t myCpu;
81  ppc_cpu_revision_t myCpuRevision;
82
83  uintptr_t interrupt_stack_start = (uintptr_t) bsp_interrupt_stack_start;
84  uintptr_t interrupt_stack_size = (uintptr_t) bsp_interrupt_stack_size;
85
86  /*
87   * Get CPU identification dynamically. Note that the get_ppc_cpu_type() function
88   * store the result in global variables so that it can be used latter...
89   */
90  myCpu = get_ppc_cpu_type();
91  myCpuRevision = get_ppc_cpu_revision();
92
93  /* Basic CPU initialization */
94  cpu_init();
95
96  /*
97   * Enable instruction and data caches. Do not force writethrough mode.
98   */
99
100#ifdef BSP_INSTRUCTION_CACHE_ENABLED
101  rtems_cache_enable_instruction();
102#endif
103
104#ifdef BSP_DATA_CACHE_ENABLED
105  rtems_cache_enable_data();
106#endif
107
108  /*
109   * This is evaluated during runtime, so it should be ok to set it
110   * before we initialize the drivers.
111   */
112
113  /* Initialize some device driver parameters */
114
115#ifdef HAS_UBOOT
116  BSP_bus_frequency = bsp_uboot_board_info.bi_busfreq;
117#else /* HAS_UBOOT */
118  BSP_bus_frequency = BSP_CLKIN_FRQ * BSP_SYSPLL_MF / BSP_SYSPLL_CKID;
119#endif /* HAS_UBOOT */
120  bsp_time_base_frequency = BSP_bus_frequency / 4;
121  bsp_clicks_per_usec = bsp_time_base_frequency / 1000000;
122
123  /* Initialize some console parameters */
124  for (i = 0; i < Console_Configuration_Count; ++i) {
125    Console_Configuration_Ports [i].ulClock = BSP_bus_frequency;
126
127    #ifdef HAS_UBOOT
128      Console_Configuration_Ports [i].pDeviceParams =
129        (void *) bsp_uboot_board_info.bi_baudrate;
130    #endif
131  }
132
133  /* Initialize exception handler */
134#ifndef BSP_DATA_CACHE_ENABLED
135  ppc_exc_cache_wb_check = 0;
136#endif
137  ppc_exc_initialize(
138    PPC_INTERRUPT_DISABLE_MASK_DEFAULT,
139    interrupt_stack_start,
140    interrupt_stack_size
141  );
142
143  /* Install default handler for the decrementer exception */
144  sc = ppc_exc_set_handler( ASM_DEC_VECTOR, mpc83xx_decrementer_exception_handler);
145  if (sc != RTEMS_SUCCESSFUL) {
146    BSP_panic("cannot install decrementer exception handler");
147  }
148
149  /* Initalize interrupt support */
150  bsp_interrupt_initialize();
151
152#ifdef SHOW_MORE_INIT_SETTINGS
153  printk("Exit from bspstart\n");
154#endif
155}
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