1 | /*--------------------------------------------------------------------------------- |
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2 | Copyright (C) 2005 |
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3 | Dave Murphy (WinterMute) |
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4 | |
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5 | This software is provided 'as-is', without any express or implied |
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6 | warranty. In no event will the authors be held liable for any |
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7 | damages arising from the use of this software. |
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8 | |
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9 | Permission is granted to anyone to use this software for any |
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10 | purpose, including commercial applications, and to alter it and |
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11 | redistribute it freely, subject to the following restrictions: |
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12 | |
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13 | 1. The origin of this software must not be misrepresented; you |
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14 | must not claim that you wrote the original software. If you use |
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15 | this software in a product, an acknowledgment in the product |
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16 | documentation would be appreciated but is not required. |
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17 | 2. Altered source versions must be plainly marked as such, and |
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18 | must not be misrepresented as being the original software. |
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19 | 3. This notice may not be removed or altered from any source |
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20 | distribution. |
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21 | |
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22 | ---------------------------------------------------------------------------------*/ |
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23 | |
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24 | #include <nds/interrupts.h> |
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25 | #include <nds/system.h> |
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26 | |
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27 | void IntrMain(void); // Prototype for assembly interrupt dispatcher |
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28 | |
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29 | static void irqDummy(void) {} |
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30 | |
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31 | |
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32 | #ifdef ARM9 |
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33 | #define INT_TABLE_SECTION __attribute__((section(".bsp_fast_text"))) |
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34 | #else |
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35 | #define INT_TABLE_SECTION |
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36 | #endif |
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37 | |
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38 | struct IntTable irqTable[MAX_INTERRUPTS] INT_TABLE_SECTION; |
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39 | |
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40 | //--------------------------------------------------------------------------------- |
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41 | void irqSet(int mask, IntFn handler) { |
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42 | //--------------------------------------------------------------------------------- |
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43 | if (!mask) return; |
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44 | |
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45 | int i; |
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46 | |
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47 | for (i=0;i<MAX_INTERRUPTS;i++) |
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48 | if (!irqTable[i].mask || irqTable[i].mask == mask) break; |
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49 | |
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50 | if ( i == MAX_INTERRUPTS ) return; |
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51 | |
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52 | irqTable[i].handler = handler; |
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53 | irqTable[i].mask = mask; |
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54 | |
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55 | if(mask & IRQ_VBLANK) |
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56 | REG_DISPSTAT |= DISP_VBLANK_IRQ ; |
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57 | if(mask & IRQ_HBLANK) |
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58 | REG_DISPSTAT |= DISP_HBLANK_IRQ ; |
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59 | |
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60 | REG_IE |= mask; |
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61 | } |
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62 | |
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63 | //--------------------------------------------------------------------------------- |
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64 | void irqInit() { |
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65 | //--------------------------------------------------------------------------------- |
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66 | int i; |
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67 | |
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68 | // Set all interrupts to dummy functions. |
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69 | for(i = 0; i < MAX_INTERRUPTS; i ++) |
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70 | { |
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71 | irqTable[i].handler = irqDummy; |
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72 | irqTable[i].mask = 0; |
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73 | } |
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74 | |
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75 | IRQ_HANDLER = IntrMain; |
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76 | |
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77 | REG_IE = 0; // disable all interrupts |
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78 | REG_IF = IRQ_ALL; // clear all pending interrupts |
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79 | REG_IME = 1; // enable global interrupt |
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80 | |
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81 | } |
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82 | |
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83 | |
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84 | //--------------------------------------------------------------------------------- |
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85 | void irqClear(int mask) { |
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86 | //--------------------------------------------------------------------------------- |
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87 | int i = 0; |
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88 | |
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89 | for (i=0;i<MAX_INTERRUPTS;i++) |
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90 | if (irqTable[i].mask == mask) break; |
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91 | |
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92 | if ( i == MAX_INTERRUPTS ) return; |
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93 | |
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94 | irqTable[i].handler = irqDummy; |
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95 | |
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96 | if (mask & IRQ_VBLANK) |
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97 | REG_DISPSTAT &= ~DISP_VBLANK_IRQ ; |
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98 | if (mask & IRQ_HBLANK) |
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99 | REG_DISPSTAT &= ~DISP_HBLANK_IRQ ; |
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100 | if (mask & IRQ_VCOUNT) |
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101 | REG_DISPSTAT &= ~DISP_YTRIGGER_IRQ; |
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102 | |
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103 | REG_IE &= ~mask; |
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104 | } |
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105 | |
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106 | |
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107 | //--------------------------------------------------------------------------------- |
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108 | void irqInitHandler(IntFn handler) { |
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109 | //--------------------------------------------------------------------------------- |
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110 | REG_IME = 0; |
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111 | REG_IF = ~0; |
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112 | REG_IE = 0; |
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113 | |
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114 | IRQ_HANDLER = handler; |
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115 | |
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116 | REG_IME = 1; |
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117 | } |
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118 | |
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119 | //--------------------------------------------------------------------------------- |
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120 | void irqEnable(uint32 irq) { |
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121 | //--------------------------------------------------------------------------------- |
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122 | if (irq & IRQ_VBLANK) |
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123 | REG_DISPSTAT |= DISP_VBLANK_IRQ ; |
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124 | if (irq & IRQ_HBLANK) |
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125 | REG_DISPSTAT |= DISP_HBLANK_IRQ ; |
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126 | if (irq & IRQ_VCOUNT) |
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127 | REG_DISPSTAT |= DISP_YTRIGGER_IRQ; |
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128 | |
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129 | REG_IE |= irq; |
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130 | REG_IME = 1; |
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131 | } |
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132 | |
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133 | //--------------------------------------------------------------------------------- |
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134 | void irqDisable(uint32 irq) { |
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135 | //--------------------------------------------------------------------------------- |
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136 | if (irq & IRQ_VBLANK) |
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137 | REG_DISPSTAT &= ~DISP_VBLANK_IRQ ; |
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138 | if (irq & IRQ_HBLANK) |
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139 | REG_DISPSTAT &= ~DISP_HBLANK_IRQ ; |
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140 | if (irq & IRQ_VCOUNT) |
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141 | REG_DISPSTAT &= ~DISP_YTRIGGER_IRQ; |
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142 | |
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143 | REG_IE &= ~irq; |
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144 | } |
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145 | |
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