1 | /* |
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2 | * This set of routines starts the application. It includes application, |
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3 | * board, and monitor specific initialization and configuration. |
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4 | * The generic CPU dependent initialization has been performed |
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5 | * before any of these are invoked. |
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6 | * |
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7 | * COPYRIGHT (c) 1989-2008. |
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8 | * On-Line Applications Research Corporation (OAR). |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.rtems.com/license/LICENSE. |
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13 | */ |
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14 | |
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15 | #include <string.h> |
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16 | #include <fcntl.h> |
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17 | |
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18 | #include <libcpu/bat.h> |
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19 | #include <libcpu/spr.h> |
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20 | #include <libcpu/powerpc-utility.h> |
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21 | |
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22 | #include <bsp.h> |
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23 | #include <bsp/irq.h> |
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24 | #include <bsp/vectors.h> |
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25 | #include <bsp/bootcard.h> |
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26 | #include <bsp/irq-generic.h> |
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27 | |
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28 | /* |
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29 | * CPU Bus Frequency |
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30 | */ |
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31 | unsigned int BSP_bus_frequency; |
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32 | |
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33 | /* Configuration parameter for clock driver */ |
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34 | uint32_t bsp_time_base_frequency; |
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35 | |
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36 | /* Legacy */ |
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37 | uint32_t bsp_clicks_per_usec; |
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38 | |
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39 | /* |
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40 | * Memory on this board. |
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41 | */ |
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42 | extern char RamSize[]; |
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43 | extern char bsp_interrupt_stack_start[]; |
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44 | extern char bsp_interrupt_stack_end[]; |
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45 | extern char bsp_interrupt_stack_size[]; |
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46 | uint32_t BSP_mem_size = (uint32_t)RamSize; |
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47 | |
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48 | /* Default decrementer exception handler */ |
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49 | static int default_decrementer_exception_handler( BSP_Exception_frame *frame, unsigned number) |
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50 | { |
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51 | ppc_set_decrementer_register(UINT32_MAX); |
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52 | |
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53 | return 0; |
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54 | } |
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55 | |
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56 | /* |
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57 | * bsp_start |
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58 | * |
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59 | * This routine does the bulk of the system initialization. |
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60 | */ |
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61 | |
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62 | void bsp_start( void ) |
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63 | { |
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64 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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65 | uintptr_t intrStackStart; |
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66 | uintptr_t intrStackSize; |
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67 | |
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68 | /* |
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69 | * Note we can not get CPU identification dynamically, so |
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70 | * force current_ppc_cpu. |
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71 | */ |
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72 | current_ppc_cpu = PPC_PSIM; |
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73 | |
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74 | /* |
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75 | * initialize the device driver parameters |
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76 | * assume we are running with 20MHz bus |
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77 | * this should speed up some tests :-) |
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78 | */ |
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79 | BSP_bus_frequency = 20; |
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80 | bsp_time_base_frequency = 20000000; |
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81 | bsp_clicks_per_usec = BSP_bus_frequency; |
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82 | |
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83 | /* |
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84 | * Initialize the interrupt related settings. |
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85 | */ |
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86 | intrStackStart = (uintptr_t) bsp_interrupt_stack_start; |
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87 | intrStackSize = (uintptr_t) bsp_interrupt_stack_size; |
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88 | |
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89 | BSP_mem_size = (uint32_t )RamSize; |
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90 | |
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91 | /* |
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92 | * Initialize default raw exception handlers. |
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93 | */ |
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94 | ppc_exc_initialize( |
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95 | PPC_INTERRUPT_DISABLE_MASK_DEFAULT, |
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96 | intrStackStart, |
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97 | intrStackSize |
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98 | ); |
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99 | |
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100 | /* Install default handler for the decrementer exception */ |
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101 | sc = ppc_exc_set_handler( ASM_DEC_VECTOR, default_decrementer_exception_handler); |
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102 | if (sc != RTEMS_SUCCESSFUL) { |
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103 | BSP_panic("cannot install decrementer exception handler"); |
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104 | } |
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105 | |
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106 | /* Initalize interrupt support */ |
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107 | bsp_interrupt_initialize(); |
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108 | |
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109 | #if 0 |
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110 | /* |
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111 | * Setup BATs and enable MMU |
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112 | */ |
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113 | /* Memory */ |
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114 | setdbat(0, 0x0<<24, 0x0<<24, 2<<24, _PAGE_RW); |
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115 | setibat(0, 0x0<<24, 0x0<<24, 2<<24, 0); |
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116 | /* PCI */ |
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117 | setdbat(1, 0x8<<24, 0x8<<24, 1<<24, IO_PAGE); |
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118 | setdbat(2, 0xc<<24, 0xc<<24, 1<<24, IO_PAGE); |
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119 | |
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120 | _write_MSR(_read_MSR() | MSR_DR | MSR_IR); |
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121 | __asm__ volatile("sync; isync"); |
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122 | #endif |
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123 | } |
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