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annotate packages/hal/powerpc/arch/current/src/hal_intr.c @ 130:eb9fd8c04db3 ecos-sw-2000-10-23

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Merge from eCos master repository on 2000-10-23-17:01:37-BST
author jlarmour
date Mon, 23 Oct 2000 17:10:57 +0000
parents c5536bad4c24
children d397fc472bcf
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1 //==========================================================================
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2 //
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3 // hal_intr.c
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4 //
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5 // PowerPC interrupt handlers
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jskov
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35 // Contributors: jskov
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36 // Date: 1999-02-20
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37 // Purpose: PowerPC interrupt handlers
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38 // Description: This file contains code to handle interrupt related issues
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39 // on the PowerPC.
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //==========================================================================
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44
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45 #include <pkgconf/hal.h>
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46
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47 #include <cyg/hal/hal_intr.h>
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49 externC void
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50 hal_IRQ_init(void)
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51 {
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52 // No architecture general initialization, but the variant may have
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53 // provided some.
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54 hal_variant_IRQ_init();
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56 // Initialize real-time clock (for delays, etc, even if kernel doesn't use it)
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57 HAL_CLOCK_INITIALIZE(CYGNUM_HAL_RTC_PERIOD);
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58 }
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59
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60 // Delay for some number of useconds.
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61 externC void
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62 hal_delay_us(int us)
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63 {
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64 cyg_uint32 old_dec, new_dec;
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65 long ticks;
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66 // Note: the system constant CYGNUM_HAL_RTC_PERIOD corresponds to 10,000us
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67 // Scale the desired number of microseconds to be a number of decrementer ticks
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68 if (CYGNUM_HAL_RTC_PERIOD > 10000) {
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69 ticks = us * (CYGNUM_HAL_RTC_PERIOD * 100) / 1000000;
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70 } else {
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71 ticks = us / (CYGNUM_HAL_RTC_PERIOD * 100) / 1000000;
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72 }
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73 asm volatile("mfdec %0;" : "=r"(old_dec) : );
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74 while (ticks-- > 0) {
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75 do {
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76 asm volatile("mfdec %0;" : "=r"(new_dec) : );
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77 } while (old_dec == new_dec);
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78 old_dec = new_dec;
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79 }
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80 }
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82 // -------------------------------------------------------------------------
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83 // EOF hal_intr.c