[67a2288] | 1 | /* irq_init.c |
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| 2 | * |
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| 3 | * This file contains the implementation of rtems initialization |
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| 4 | * related to interrupt handling. |
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| 5 | * |
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| 6 | * CopyRight (C) 1998 valette@crf.canon.fr |
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| 7 | * |
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| 8 | * The license and distribution terms for this file may be |
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| 9 | * found in the file LICENSE in this distribution or at |
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| 10 | * http://www.OARcorp.com/rtems/license.html. |
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| 11 | * |
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| 12 | * $Id$ |
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| 13 | */ |
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| 14 | |
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| 15 | #include <libcpu/cpu.h> |
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| 16 | #include <irq.h> |
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| 17 | #include <bsp.h> |
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| 18 | |
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| 19 | /* |
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| 20 | * rtems prologue generated in irq_asm.S |
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| 21 | */ |
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| 22 | extern void rtems_irq_prologue_0(); |
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| 23 | extern void rtems_irq_prologue_1(); |
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| 24 | extern void rtems_irq_prologue_2(); |
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| 25 | extern void rtems_irq_prologue_3(); |
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| 26 | extern void rtems_irq_prologue_4(); |
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| 27 | extern void rtems_irq_prologue_5(); |
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| 28 | extern void rtems_irq_prologue_6(); |
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| 29 | extern void rtems_irq_prologue_7(); |
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| 30 | extern void rtems_irq_prologue_8(); |
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| 31 | extern void rtems_irq_prologue_9(); |
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| 32 | extern void rtems_irq_prologue_10(); |
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| 33 | extern void rtems_irq_prologue_11(); |
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| 34 | extern void rtems_irq_prologue_12(); |
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| 35 | extern void rtems_irq_prologue_13(); |
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| 36 | extern void rtems_irq_prologue_14(); |
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| 37 | extern void rtems_irq_prologue_15(); |
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| 38 | /* |
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| 39 | * default idt vector |
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| 40 | */ |
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| 41 | extern void default_raw_idt_handler(); |
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| 42 | /* |
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| 43 | * default on/off function |
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| 44 | */ |
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| 45 | static void nop_func(){} |
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| 46 | /* |
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| 47 | * default isOn function |
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| 48 | */ |
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| 49 | static int not_connected() {return 0;} |
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| 50 | |
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| 51 | |
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| 52 | static rtems_raw_irq_connect_data idtHdl[IDT_SIZE]; |
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| 53 | |
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| 54 | /* |
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| 55 | * Table used to store rtems managed interrupt handlers. |
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| 56 | * Borrow the table to store raw handler entries at the beginning. |
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| 57 | * The table will be reinitialized before the call to pc386_rtems_irq_mngt_set(). |
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| 58 | */ |
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| 59 | static rtems_irq_connect_data rtemsIrq[PC_386_IRQ_LINES_NUMBER] = { |
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| 60 | {0,(rtems_irq_hdl)rtems_irq_prologue_0}, |
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| 61 | {0,(rtems_irq_hdl)rtems_irq_prologue_1}, |
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| 62 | {0,(rtems_irq_hdl)rtems_irq_prologue_2}, |
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| 63 | {0,(rtems_irq_hdl)rtems_irq_prologue_3}, |
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| 64 | {0,(rtems_irq_hdl)rtems_irq_prologue_4}, |
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| 65 | {0,(rtems_irq_hdl)rtems_irq_prologue_5}, |
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| 66 | {0,(rtems_irq_hdl)rtems_irq_prologue_6}, |
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| 67 | {0,(rtems_irq_hdl)rtems_irq_prologue_7}, |
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| 68 | {0,(rtems_irq_hdl)rtems_irq_prologue_8}, |
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| 69 | {0,(rtems_irq_hdl)rtems_irq_prologue_9}, |
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| 70 | {0,(rtems_irq_hdl)rtems_irq_prologue_10}, |
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| 71 | {0,(rtems_irq_hdl)rtems_irq_prologue_11}, |
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| 72 | {0,(rtems_irq_hdl)rtems_irq_prologue_12}, |
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| 73 | {0,(rtems_irq_hdl)rtems_irq_prologue_13}, |
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| 74 | {0,(rtems_irq_hdl)rtems_irq_prologue_14}, |
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| 75 | {0,(rtems_irq_hdl)rtems_irq_prologue_15} |
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| 76 | }; |
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| 77 | |
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| 78 | static rtems_raw_irq_connect_data defaultRawIrq = { |
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| 79 | /* vectorIdex, hdl , on , off , isOn */ |
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| 80 | 0, default_raw_idt_handler ,nop_func , nop_func, not_connected |
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| 81 | }; |
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| 82 | |
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| 83 | static rtems_irq_connect_data defaultIrq = { |
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| 84 | /* vectorIdex, hdl , on , off , isOn */ |
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| 85 | 0, nop_func , nop_func , nop_func , not_connected |
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| 86 | }; |
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| 87 | |
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| 88 | static rtems_irq_prio irqPrioTable[PC_386_IRQ_LINES_NUMBER]={ |
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| 89 | /* |
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| 90 | * actual rpiorities for interrupt : |
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| 91 | * 0 means that only current interrupt is masked |
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| 92 | * 255 means all other interrupts are masked |
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| 93 | * The second entry has a priority of 255 because |
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| 94 | * it is the slave pic entry and is should always remain |
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| 95 | * unamsked. |
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| 96 | */ |
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| 97 | 0,0, |
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| 98 | 255, |
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| 99 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
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| 100 | }; |
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| 101 | |
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| 102 | |
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| 103 | |
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| 104 | static interrupt_gate_descriptor idtEntry; |
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| 105 | |
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| 106 | static rtems_irq_global_settings initial_config; |
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| 107 | static rtems_raw_irq_global_settings raw_initial_config; |
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| 108 | |
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| 109 | void raw_idt_notify() |
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| 110 | { |
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| 111 | printk("raw_idt_notify has been called \n"); |
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| 112 | } |
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| 113 | |
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| 114 | void rtems_irq_mngt_init() |
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| 115 | { |
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| 116 | int i; |
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| 117 | interrupt_gate_descriptor* idt_entry_tbl; |
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| 118 | unsigned limit; |
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| 119 | unsigned int level; |
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| 120 | |
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| 121 | |
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| 122 | i386_get_info_from_IDTR (&idt_entry_tbl, &limit); |
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| 123 | |
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| 124 | _CPU_ISR_Disable(level); |
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| 125 | |
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| 126 | /* |
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| 127 | * Init the complete IDT vector table with defaultRawIrq value |
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| 128 | */ |
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| 129 | for (i = 0; i < IDT_SIZE; i++) { |
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| 130 | idtHdl[i] = defaultRawIrq; |
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| 131 | } |
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| 132 | raw_initial_config.idtSize = IDT_SIZE; |
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| 133 | raw_initial_config.defaultRawEntry = defaultRawIrq; |
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| 134 | raw_initial_config.rawIrqHdlTbl = idtHdl; |
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| 135 | |
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| 136 | if (!i386_init_idt (&raw_initial_config)) { |
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| 137 | /* |
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| 138 | * put something here that will show the failure... |
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| 139 | */ |
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| 140 | _IBMPC_initVideo(); |
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| 141 | printk("Unable to initialize IDT!!! System locked\n"); |
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| 142 | while (1); |
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| 143 | } |
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| 144 | /* |
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| 145 | * Patch the entry that will be used by RTEMS for interrupt management |
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| 146 | * with RTEMS prologue. |
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| 147 | */ |
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| 148 | for (i = 0; i < PC_386_IRQ_LINES_NUMBER; i++) { |
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| 149 | create_interrupt_gate_descriptor(&idtEntry,(rtems_raw_irq_hdl) rtemsIrq[i].hdl); |
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| 150 | idt_entry_tbl[i + PC386_ASM_IRQ_VECTOR_BASE] = idtEntry; |
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| 151 | } |
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| 152 | /* |
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| 153 | * At this point we have completed the initialization of IDT |
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| 154 | * with raw handlers. We must now initialize the higher level |
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| 155 | * interrupt management. |
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| 156 | */ |
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| 157 | /* |
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| 158 | * re-init the rtemsIrq table |
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| 159 | */ |
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| 160 | for (i = 0; i < PC_386_IRQ_LINES_NUMBER; i++) { |
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| 161 | rtemsIrq[i] = defaultIrq; |
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| 162 | } |
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| 163 | /* |
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| 164 | * Init initial Interrupt management config |
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| 165 | */ |
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| 166 | initial_config.irqNb = PC_386_IRQ_LINES_NUMBER; |
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| 167 | initial_config.defaultEntry = defaultIrq; |
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| 168 | initial_config.irqHdlTbl = rtemsIrq; |
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| 169 | initial_config.irqBase = PC386_ASM_IRQ_VECTOR_BASE; |
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| 170 | initial_config.irqPrioTbl = irqPrioTable; |
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| 171 | if (!pc386_rtems_irq_mngt_set(&initial_config)) { |
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| 172 | /* |
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| 173 | * put something here that will show the failure... |
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| 174 | */ |
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| 175 | _IBMPC_initVideo(); |
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| 176 | printk("Unable to initialize RTEMS interrupt Management!!! System locked\n"); |
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| 177 | while (1); |
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| 178 | } |
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| 179 | |
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[dbab462] | 180 | /* |
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| 181 | * #define DEBUG |
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| 182 | */ |
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[67a2288] | 183 | #ifdef DEBUG |
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| 184 | { |
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| 185 | /* |
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| 186 | * following adresses should be the same |
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| 187 | */ |
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| 188 | unsigned tmp; |
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| 189 | |
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| 190 | _IBMPC_initVideo(); |
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| 191 | |
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| 192 | printk("idt_entry_tbl = %x Interrupt_descriptor_table addr = %x\n", |
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| 193 | idt_entry_tbl, &Interrupt_descriptor_table); |
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| 194 | tmp = (unsigned) get_hdl_from_vector (PC386_ASM_IRQ_VECTOR_BASE + PC_386_PERIODIC_TIMER); |
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| 195 | printk("clock isr address from idt = %x should be %x\n", |
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| 196 | tmp, (unsigned) rtems_irq_prologue_0); |
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| 197 | } |
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| 198 | printk("i8259s_cache = %x\n", * (unsigned short*) &i8259s_cache); |
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| 199 | debugPollingGetChar(); |
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| 200 | #endif |
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| 201 | asm volatile ("sti"); |
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| 202 | } |
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