100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
//
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// Copyright (c) 2017 The Altra64 project contributors
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// Portions (c) 2013 saturnu (Alt64) based on libdragon, Neo64Menu, ED64IO, libn64-hkz, libmikmod
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// See LICENSE file in the project root for full license information.
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//
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#include "sram.h"
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#include "everdrive.h"
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#include "sys.h"
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void pif_boot()
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{
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//TODO: implement
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}
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int is_valid_rom(unsigned char *buffer) {
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/* Test if rom is a native .z64 image with header 0x80371240. [ABCD] */
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if((buffer[0]==0x80)&&(buffer[1]==0x37)&&(buffer[2]==0x12)&&(buffer[3]==0x40))
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return 0;
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/* Test if rom is a byteswapped .v64 image with header 0x37804012. [BADC] */
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else if((buffer[0]==0x37)&&(buffer[1]==0x80)&&(buffer[2]==0x40)&&(buffer[3]==0x12))
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return 1;
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/* Test if rom is a wordswapped .n64 image with header 0x40123780. [DCBA] */
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else if((buffer[0]==0x40)&&(buffer[1]==0x12)&&(buffer[2]==0x37)&&(buffer[3]==0x80))
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return 2;
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else
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return 0;
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}
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void swap_header(unsigned char* header, int loadlength) {
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unsigned char temp;
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int i;
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/* Btyeswap if .v64 image. */
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if( header[0]==0x37) {
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for (i = 0; i < loadlength; i+=2) {
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temp= header[i];
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header[i]= header[i+1];
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header[i+1]=temp;
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}
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}
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/* Wordswap if .n64 image. */
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else if( header[0]==0x40) {
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for (i = 0; i < loadlength; i+=4) {
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temp= header[i];
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header[i]= header[i+3];
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header[i+3]=temp;
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temp= header[i+1];
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header[i+1]= header[i+2];
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header[i+2]=temp;
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}
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}
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}
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u8 getCicType(u8 bios_cic) {
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u8 cic_buff[2048];
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volatile u8 cic_chip;
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volatile u32 val;
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if (bios_cic) {
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evd_setCfgBit(ED_CFG_SDRAM_ON, 0);
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sleep(10);
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val = *(u32 *) 0xB0000170;
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dma_read_s(cic_buff, 0xB0000040, 1024);
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cic_chip = get_cic(cic_buff);
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evd_setCfgBit(ED_CFG_SDRAM_ON, 1);
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sleep(10);
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}
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else {
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val = *(u32 *) 0xB0000170;
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dma_read_s(cic_buff, 0xB0000040, 1024);
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cic_chip = get_cic(cic_buff);
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}
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return cic_chip;
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}
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int get_cic(unsigned char *buffer) {
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unsigned int crc;
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// figure out the CIC
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crc = CRC_Calculate(0, buffer, 1000);
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switch(crc) {
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case 0x303faac9:
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case 0xf0da3d50:
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return 1;
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case 0xf3106101:
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return 2;
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case 0xe7cd9d51:
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return 3;
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case 0x7ae65c9:
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return 5;
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case 0x86015f8f:
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return 6;
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}
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return 2;
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} |