oremeq@18: #include <stdio.h>
oremeq@18: 
oremeq@18: 
oremeq@18: /* size of NVRAM in bytes */
oremeq@18: #define NVRAM_MAX_SIZE 262144
oremeq@18: 
oremeq@18: /* size of block in byte */
oremeq@18: #define NVRAM_BLOCK_SIZE 256
oremeq@18: 
oremeq@18: #define NVRAM_FILE_NAME "__nvram__"
oremeq@18: 
oremeq@18: FILE *nvram_file = NULL;
oremeq@18: 
oremeq@18: 
oremeq@18: void iat_flash_read_regs();
oremeq@18: void iat_flash_write_regs();
oremeq@18: void iat_flash_write_page(unsigned int);
oremeq@18: void iat_flash_read_page(unsigned int);
oremeq@18: 
oremeq@18: 
oremeq@18: short data_len; /* 0 to NVRAM_BLOCK_SIZE bytes */
oremeq@18: short data_num_pages;
oremeq@18: unsigned int *data_page = NULL;
oremeq@18: unsigned int data_addr;
oremeq@18: 
oremeq@18: unsigned int *regs_page = NULL;
oremeq@18: 
oremeq@18: int iat_init()
oremeq@18: {
oremeq@18: 	int i;
oremeq@18: 
oremeq@18: 	nvram_file = fopen(NVRAM_FILE_NAME, "wr");
oremeq@18: 	if (nvram_file  == NULL)
oremeq@18: 		return -1;
oremeq@18: 
oremeq@18: 	int n = NVRAM_BLOCK_SIZE / sizeof(unsigned int);
oremeq@18: 
oremeq@18: 	/* some actions to initialise the flash */
oremeq@18: 	data_len = 0;
oremeq@18: 	data_num_pages = 0;
oremeq@18: 
oremeq@18: 	data_page = (unsigned int *)malloc(sizeof(unsigned int) * n);
oremeq@18: 	memset(data_page, 0, sizeof(unsigned int)*n);
oremeq@18: 
oremeq@18: 	if (data_page == NULL)
oremeq@18: 		return -1;
oremeq@18: 
oremeq@18: 	regs_page = (unsigned int *)malloc(sizeof(unsigned int) * n);
oremeq@18: 	memset(regs_page, 0, sizeof(unsigned int)*n);
oremeq@18: 	if (regs_page == NULL)
oremeq@18: 		return -2;
oremeq@18: 
oremeq@18: 	iat_flash_read_regs();
oremeq@18: 
oremeq@18: 	/* start the data at the location specified in the registers */ 
oremeq@18: 	if (0) /* for now it is 0, but put here a test to know whether
oremeq@18:                   or not the NVRAM has been written before */
oremeq@18: 		data_addr = regs_page[1];
oremeq@18: 	else
oremeq@18: 		data_addr = NVRAM_BLOCK_SIZE; /* let start at block 1 */
oremeq@18: 
oremeq@18: 	/* create a file the size of the simulated NVRAM */
oremeq@18: 	for(i=0; i<NVRAM_MAX_SIZE/NVRAM_BLOCK_SIZE + 1; i++)
oremeq@18: 		fwrite(data_page, sizeof(unsigned int), n, nvram_file);
oremeq@18: 
oremeq@18: 	return 0;
oremeq@18: }
oremeq@18: 
oremeq@18: 
oremeq@18: void iat_end()
oremeq@18: {
oremeq@18: 	iat_flash_write_page(data_addr);
oremeq@18: 
oremeq@18: 	iat_flash_write_regs();
oremeq@18: 
oremeq@18: 	fclose(nvram_file);
oremeq@18: }
oremeq@18: 
oremeq@18:  
oremeq@18: void iat_flash_read_regs()
oremeq@18: {
oremeq@18: 	fseek(nvram_file, 0, SEEK_SET);
oremeq@18: 	fread(regs_page, sizeof(unsigned int), NVRAM_BLOCK_SIZE, nvram_file);
oremeq@18: }
oremeq@18: 
oremeq@18: 
oremeq@18: void iat_flash_write_regs()
oremeq@18: {
oremeq@18: 	fseek(nvram_file, 0, SEEK_SET);
oremeq@18: 	fwrite(regs_page, sizeof(unsigned int), NVRAM_BLOCK_SIZE, nvram_file);
oremeq@18: }
oremeq@18: 
oremeq@18: 
oremeq@18: void iat_flash_read_page(unsigned int addr)
oremeq@18: {
oremeq@18: 	fseek(nvram_file, addr*sizeof(unsigned int), SEEK_SET);
oremeq@18: 	fread(data_page, sizeof(unsigned int), NVRAM_BLOCK_SIZE, nvram_file);
oremeq@18: }
oremeq@18: 
oremeq@18: 
oremeq@18: void iat_flash_write_page(unsigned int addr)
oremeq@18: {
oremeq@18: 	fseek(nvram_file, addr*sizeof(unsigned int), SEEK_SET);
oremeq@18: 	fwrite(data_page, sizeof(unsigned int), NVRAM_BLOCK_SIZE, nvram_file);
oremeq@18: }
oremeq@18: 
oremeq@18: 
oremeq@18: /*------------------------------------------------------*/
oremeq@18: int main()
oremeq@18: {
oremeq@18: 	iat_init();
oremeq@18: 	iat_end();
oremeq@18: }
oremeq@18: /*------------------------------------------------------*/