2 ** @(#)cstart.c 1.8 $E%
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4 ** Copyright 1997-2012 Altium BV *
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8 ** The system startup code initializes the processor's registers
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9 ** and the application C variables.
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14 #pragma profiling off /* prevent profiling information on cstart */
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15 #pragma optimize abcefgIJKlopRsUy /* preset optimization level */
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16 #pragma tradeoff 4 /* preset tradeoff level */
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17 #pragma runtime BCMSZ /* disable runtime error checking for cstart */
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18 #pragma warning 750 /* do not warn about unsaved registers */
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19 #pragma section .text=cstart /* use: .text.cstart as the section name */
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20 #pragma alias Reset_Handler = _START /* requirement for CMSIS */
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21 #pragma extern Reset_Handler /* required for mil-linking with CMSIS */
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26 #define VTOR (*(volatile unsigned int *)0xE000ED08)
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27 #define PREF_PCON (*(volatile unsigned int *)0x58004000)
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28 #define SCU_GCU_PEEN (*(volatile unsigned int *)0x5000413C)
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29 #define SCU_GCU_PEFLAG (*(volatile unsigned int *)0x50004150)
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32 extern unsigned char _lc_ub_stack[];
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33 extern unsigned char _lc_vtor_value[];
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36 #pragma extern _Exit
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38 extern int main( int argc, char *argv[] );
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39 extern void SystemInit( void );
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40 extern void __init( void );
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42 extern void __prof_init( void );
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46 extern void * _posix_boot_stack_top;
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47 extern int posix_main( void );
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50 #ifdef __USE_ARGC_ARGV
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51 #ifndef __ARGCV_BUFSIZE
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52 #define __ARGCV_BUFSIZE 256
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54 static char argcv[__ARGCV_BUFSIZE];
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57 void __interrupt() __frame() _START( void )
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59 PREF_PCON |= 0x00010000; /* Disable Branch prediction */
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60 SCU_GCU_PEFLAG =0xFFFFFFFF; /* Clear existing parity errors if any */
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61 SCU_GCU_PEEN = 0; /* Disable parity */
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64 * Anticipate possible ROM/RAM remapping
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65 * by loading the 'real' program address.
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69 * Initialize stack pointer.
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71 __setsp( _lc_ub_stack );
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73 * Call a user function which initializes hardware,
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74 * such as ROM/RAM re-mapping or MMU configuration.
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78 * Copy initialized sections from ROM to RAM
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79 * and clear uninitialized data sections in RAM.
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82 __asm( "_cptable_handled:" ); /* symbol may be used by debugger */
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85 * Load VTOR register with the actual vector table
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88 VTOR = (unsigned int)_lc_vtor_value;
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91 __setsp( _posix_boot_stack_top );
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97 exit( posix_main() );
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98 #elif defined __USE_ARGC_ARGV
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99 exit( main( _argcv( argcv, __ARGCV_BUFSIZE ), (char **)argcv ) );
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101 exit( main( 0, NULL ) );
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