78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
/******************************************************************************
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*
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* @brief Implement generic NV32 startup code.
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*
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*******************************************************************************/
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#include "common.h"
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#pragma section = ".data"
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#pragma section = ".data_init"
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#pragma section = ".bss"
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#pragma section = "CodeRelocate"
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#pragma section = "CodeRelocateRam"
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/********************************************************************/
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void
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common_startup(void)
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{
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// extern char __DATA_ROM[];
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// extern char __DATA_RAM[];
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// extern char __DATA_END[];
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/* Declare a counter we'll use in all of the copy loops */
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uint32 n;
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/* Addresses for VECTOR_TABLE and VECTOR_RAM come from the linker file */
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extern uint32 __VECTOR_TABLE[];
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extern uint32 __VECTOR_RAM[];
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/* Copy the vector table to RAM */
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if (__VECTOR_RAM != __VECTOR_TABLE)
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{
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for (n = 0; n < 48 ; n++) // for small memory space, excluding flash configuration field
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__VECTOR_RAM[n] = __VECTOR_TABLE[n];
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}
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/* Point the VTOR to the new copy of the vector table */
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write_vtor((uint32)__VECTOR_RAM);
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/* Get the addresses for the .data section (initialized data section) */
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uint8* data_ram = __section_begin(".data");
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uint8* data_rom = __section_begin(".data_init");
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uint8* data_rom_end = __section_end(".data_init");
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/* Copy initialized data from ROM to RAM */
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n = data_rom_end - data_rom;
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while (n--)
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*data_ram++ = *data_rom++;
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/* Get the addresses for the .bss section (zero-initialized data) */
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uint8* bss_start = __section_begin(".bss");
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uint8* bss_end = __section_end(".bss");
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/* Clear the zero-initialized data section */
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n = bss_end - bss_start;
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while(n--)
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*bss_start++ = 0;
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/* Get addresses for any code sections that need to be copied from ROM to RAM.
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* The IAR tools have a predefined keyword that can be used to mark individual
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* functions for execution from RAM. Add "__ramfunc" before the return type in
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* the function prototype for any routines you need to execute from RAM instead
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* of ROM. ex: __ramfunc void foo(void);
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*/
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uint8* code_relocate_ram = __section_begin("CodeRelocateRam");
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uint8* code_relocate = __section_begin("CodeRelocate");
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uint8* code_relocate_end = __section_end("CodeRelocate");
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/* Copy functions from ROM to RAM */
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n = code_relocate_end - code_relocate;
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while (n--)
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*code_relocate_ram++ = *code_relocate++;
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}
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/********************************************************************/
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