1 | /** |
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2 | * @file irq.c |
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3 | * |
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4 | * This file contains the implementation of the function described in irq.h. |
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5 | */ |
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6 | /* |
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7 | * RTEMS GBA BSP |
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8 | * |
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9 | * Copyright (c) 2010 embedded brains GmbH. |
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10 | * |
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11 | * Copyright (c) 2002 by Jay Monkman <jtm@smoothsmoothie.com> |
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12 | * |
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13 | * Copyright (c) 2002 by Charlie Steader <charlies@poliac.com> |
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14 | * |
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15 | * Copyright (c) 2004 by Markku Puro <markku.puro@kopteri.net> |
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16 | * |
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17 | * The license and distribution terms for this file may be |
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18 | * found in the file LICENSE in this distribution or at |
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19 | * http://www.rtems.org/license/LICENSE. |
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20 | */ |
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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/irq-generic.h> |
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25 | |
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26 | #include <gba_registers.h> |
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27 | |
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28 | void bsp_interrupt_dispatch(void) |
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29 | { |
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30 | unsigned reg_ie = GBA_REG_IE; |
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31 | unsigned reg_if = GBA_REG_IF & reg_ie; |
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32 | rtems_vector_number vector = 31 - __builtin_clz(reg_if); |
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33 | |
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34 | bsp_interrupt_handler_dispatch(vector); |
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35 | |
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36 | GBA_REG_IF = 1 << vector; |
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37 | } |
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38 | |
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39 | rtems_status_code bsp_interrupt_vector_enable(rtems_vector_number vector) |
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40 | { |
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41 | GBA_REG_IE |= 1 << vector; |
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42 | |
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43 | return RTEMS_SUCCESSFUL; |
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44 | } |
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45 | |
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46 | rtems_status_code bsp_interrupt_vector_disable(rtems_vector_number vector) |
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47 | { |
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48 | GBA_REG_IE &= ~(1 << vector); |
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49 | |
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50 | return RTEMS_SUCCESSFUL; |
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51 | } |
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52 | |
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53 | rtems_status_code bsp_interrupt_facility_initialize(void) |
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54 | { |
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55 | /* clear all interrupt status flags */ |
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56 | GBA_REG_IF = 0xffff; |
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57 | /* disable all interrupts */ |
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58 | GBA_REG_IE = 0; |
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59 | /* set master interrupt enable */ |
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60 | GBA_REG_IME = 1; |
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61 | |
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62 | /* Exception handler is already present in the ROM BIOS */ |
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63 | |
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64 | return RTEMS_SUCCESSFUL; |
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65 | } |
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