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hardware.h

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00001 /*
00002 Copyright (c) 2002, 2003, Oliver Tscherwitschke
00003 All rights reserved.
00004 
00005 Redistribution and use in source and binary forms, with or without
00006 modification, are permitted provided that the following conditions are met:
00007 
00008 1. Redistributions of source code must retain the above copyright notice,
00009    this list of conditions and the following disclaimer.
00010 2. Redistributions in binary form must reproduce the above copyright notice,
00011    this list of conditions and the following disclaimer in the documentation
00012    and/or other materials provided with the distribution.
00013 3. The name of the author may not be used to endorse or promote products
00014    derived from this software without specific prior written permission.
00015 
00016 THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
00017 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
00018 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
00019 EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00020 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
00021 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
00022 OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
00023 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
00024 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
00025 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00026 */
00027 
00034 #ifndef HARDWARE_H
00035 #define HARDWARE_H
00036 
00037 
00038 /*
00039  * These definitions are only intended for otOS-internal use
00040  */
00041 #ifdef COMPILE_OTOS
00042  
00043 /* function prototypes */
00044 void otosInitHardware(void);
00045 
00046 
00047 /* hardware dependent macros */
00048 #define GET_RAM_BANK() ({                                       \
00049     uint8_t bank;                                               \
00050     __asm__ volatile (                                          \
00051         /* save ram bank */                                     \
00052         "in %0, %1"         "\n\t"      /* read PORTE */        \
00053         "andi %0, 0x3c"     "\n\t"      /* mask */              \
00054         "lsr %0"            "\n\t"      /* >> 2 */              \
00055         "lsr %0"            "\n\t"                              \
00056         : "=r" (bank)                                           \
00057         : "I" (_SFR_IO_ADDR(PORTE))                             \
00058     );                                                          \
00059     bank;                                                       \
00060 })
00061 
00062 #define SET_RAM_BANK(bank) ({                                   \
00063     uint8_t tmp;                                                \
00064     __asm__ volatile (                                          \
00065         "lsl %1"            "\n\t"      /* << 2 */              \
00066         "lsl %1"            "\n\t"                              \
00067         "in %0, %2"         "\n\t"      /* get PORTE */         \
00068         "andi %0, 0xc3"     "\n\t"      /* mask */              \
00069         "or %0, %1"         "\n\t"      /* combine */           \
00070         "out %2, %0"        "\n\t"      /* output */            \
00071         : "=&r" (tmp)                                           \
00072         : "r" (bank), "I" (_SFR_IO_ADDR(PORTE))                 \
00073     );                                                          \
00074 })
00075 
00076 
00077 
00078 
00079 
00080 #endif /* #ifdef COMPILE_OTOS */
00081 
00082 #endif

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