| 1 | /* Initialization code for coldfire boards. |
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| 2 | * |
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| 3 | * Copyright (c) 2006 CodeSourcery Inc |
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| 4 | * |
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| 5 | * The authors hereby grant permission to use, copy, modify, distribute, |
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| 6 | * and license this software and its documentation for any purpose, provided |
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| 7 | * that existing copyright notices are retained in all copies and that this |
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| 8 | * notice is included verbatim in any distributions. No written agreement, |
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| 9 | * license, or royalty fee is required for any of the authorized uses. |
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| 10 | * Modifications to this software may be copyrighted by their authors |
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| 11 | * and need not follow the licensing terms described here, provided that |
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| 12 | * the new terms are clearly indicated on the first page of each file where |
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| 13 | * they apply. |
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| 14 | */ |
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| 15 | |
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| 16 | #include <stdlib.h> |
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| 17 | |
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| 18 | extern const int __interrupt_vector[]; |
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| 19 | extern void __reset (void); |
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| 20 | |
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| 21 | extern const char __data_load[] __attribute__ ((aligned (4))); |
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| 22 | extern char __data_start[] __attribute__ ((aligned (4))); |
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| 23 | extern char __bss_start[] __attribute__ ((aligned (4))); |
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| 24 | extern char __end[] __attribute__ ((aligned (4))); |
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| 25 | void *__heap_limit; |
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| 26 | extern void software_init_hook (void) __attribute__ ((weak)); |
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| 27 | extern void hardware_init_hook (void) __attribute__ ((weak)); |
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| 28 | extern void _init (void); |
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| 29 | extern void _fini (void); |
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| 30 | |
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| 31 | extern int main (int, char **, char **); |
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| 32 | |
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| 33 | /* This is called from a tiny assembly stub. */ |
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| 34 | void __start1 (void *heap_limit) |
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| 35 | { |
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| 36 | unsigned ix; |
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| 37 | |
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| 38 | if (hardware_init_hook) |
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| 39 | hardware_init_hook (); |
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| 40 | |
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| 41 | /* Initialize memory */ |
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| 42 | if (__data_load != __data_start) |
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| 43 | memcpy (__data_start, __data_load, __bss_start - __data_start); |
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| 44 | memset (__bss_start, 0, __end - __bss_start); |
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| 45 | |
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| 46 | __heap_limit = heap_limit; |
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| 47 | |
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| 48 | if (software_init_hook) |
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| 49 | software_init_hook (); |
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| 50 | |
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| 51 | _init (); |
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| 52 | |
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| 53 | /* I'm not sure how useful it is to have a fini_section in an |
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| 54 | embedded system. */ |
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| 55 | atexit (_fini); |
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| 56 | |
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| 57 | ix = main (0, NULL, NULL); |
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| 58 | exit (ix); |
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| 59 | |
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| 60 | while (1) |
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| 61 | __reset (); |
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| 62 | } |
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| 63 | |
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| 64 | /* A default hardware init hook. */ |
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| 65 | |
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| 66 | void __attribute__ ((weak)) hardware_init_hook (void) |
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| 67 | { |
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| 68 | /* Set the VBR. */ |
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| 69 | __asm__ __volatile__ ("movec.l %0,%/vbr" :: "r" (__interrupt_vector)); |
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| 70 | |
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| 71 | #if !defined(__mcf_family_5213) && !defined(__mcf_family_51qe) && !defined(__mcf_family_51) |
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| 72 | /* Flush & enable the caches */ |
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| 73 | #define CACR_CINV (1 << 24) |
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| 74 | #define CACR_CENB (1 << 31) |
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| 75 | __asm__ __volatile__ ("movec.l %0,%/cacr" :: "r" (CACR_CINV | CACR_CENB)); |
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| 76 | #endif |
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| 77 | |
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| 78 | /* Should we drop into user mode here? */ |
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| 79 | } |
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