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nand.cpp
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nand.cpp
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#include "comm.h"
#include "state.h"
#include <cassert>
#include <cstdio>
extern nc1020_states_t nc1020_states;
static uint8_t* ram_buff = nc1020_states.ram;
static uint8_t* ram_io = ram_buff;
static uint64_t last_tick=0;
static deque<uint8_t> nand_cmd;
static int nand_read_cnt=0;
//char nand_ori[65536][528];
char nand[65536+64][528];
//char nand_spare[65536+64][16];
void read_nand_file(){
memset(nand,0xff,sizeof(nand));
char *p0= &nand[64][0];
FILE *f = fopen("./nand.bin", "rb");
if(f==0) {
printf("file ./nand.bin not exist!\n");
exit(-1);
}
fseek(f, 0, SEEK_END);
long fsize = ftell(f);
fseek(f, 0, SEEK_SET); /* same as rewind(f); */
fread(p0, fsize, 1, f);
fclose(f);
printf("<nand_file_size=%lu>\n",fsize);
//the value inside the real 0 nand 32k page. But it doesn't really matter
memcpy(&nand[0][0]+0x200+0x10 /*512+16=258*/,"ggv nc2000",strlen("ggv nc2000"));
}
void write_nand_file(){
FILE *f = fopen("./nand.bin", "wb");
fwrite(&nand[0][0]+ 64*528, sizeof(nand)-64*528, 1 , f);
fclose(f);
}
uint8_t read_nand(){
//printf("tick=%lld, read %x %02x\n",tick, addr, ram_io[addr]);
uint8_t roa_bbs=ram_io[0x0a];
uint8_t ramb_vol=ram_io[0x0d];
uint8_t bs=ram_io[0x00];
///////// uint16_t p=nc1020_states.cpu.reg_pc-4;
if(enable_debug_nand) printf("tick=%llu read $29\n",tick%10000);
if(nand_cmd.size()==0) {
printf("oops! no nand cmd\n");
return 0xff;
}
assert(nand_cmd.size()>0);
/*
special handle of read status after a long time
*/
if(nand_cmd[0]==0x70 && nand_cmd.size()==1) {
nand_cmd.clear();
nand_read_cnt=0;
return 0x40;
}
/*
robust check
*/
if(nand_cmd[0]!=0x0 && nand_cmd[0]!=0x1 &&nand_cmd[0]!=0x60 &&nand_cmd[0]!=0x50){
printf("<<%x>>!!!\n",(unsigned char)nand_cmd[0]);
for(int i=0;i<nand_cmd.size();i++){
printf("<%x>",(unsigned char)nand_cmd[i]);
}
printf("\n");
assert(false);
return 0;
}
/*
read low/high and read spare
*/
unsigned char cmd=nand_cmd[0];
if(cmd ==0 ||cmd==1||cmd==0x50){
if(nand_cmd.size()!=5 ){
printf("oops cmd size!=5\n");
for(int i=0;i<nand_cmd.size();i++){
printf("<%x>",(unsigned char)nand_cmd[i]);
}
printf("\n");
/*if(nand_cmd.size()==1 && nand_cmd[0]==0x0){
printf("oops!! nand_cmd=[0] but trying to read\n");
return 0xff;
}*/
assert(false);
return 0xff;
}
unsigned char low=nand_cmd[1];
unsigned char mid=nand_cmd[2];
unsigned char high=nand_cmd[3];
uint32_t pos=high*256u+mid;
/*
if(nand_cmd.size()==5&&false){
printf("[%x %x]",low,high);
for(int i=0;i<nand_cmd.size();i++){
printf("<%x>",(unsigned char)nand_cmd[i]);
}
printf("\n");
exit(-1);
//printf("<%x;%x,%x:%x,%d>", final, pos, low,cmd,nand_read_cnt);
}*/
unsigned int x=pos;
unsigned int y=low;
//unsigned int pre_final= pos*528u+ y +nand_read_cnt;
//assert(pre_final%528==0);
if(cmd==0x1) y+=256u;
if(cmd==0x50) y+=512u;
unsigned int final= pos*528u+ y +nand_read_cnt;
if(nand_read_cnt!=0||cmd!=0){
assert(final%528!=0);
}
//final-=32*1024;
if(nand_read_cnt==0 && enable_debug_nand){
printf("[%x %x]",low,high);
for(int i=0;i<nand_cmd.size();i++){
printf("<%x>",(unsigned char)nand_cmd[i]);
}
printf("<%x;%x,%x:%x,%d>\n", final, pos, low,cmd,nand_read_cnt);
}
char *p=&nand[0][0];
uint8_t result=p[final];
//if(final<0) return 0x00;
//uint8_t result=nand[pos][low+off+nand_read_cnt];
nand_read_cnt++;
//printf("<<%02x>>",result);
return result;
}
/*
erase
*/
//printf("bs=%x roa_bbs=%x pc=%x %x %x %x %x \n",ram_io[0x00], ram_io[0x0a], reg_pc, Peek16(p), Peek16(p+1),Peek16(p+2),Peek16(p+3));
if(cmd==0x60){
unsigned char low=nand_cmd[1];
unsigned char mid=nand_cmd[2];
unsigned char high=nand_cmd[3];
//assert(false);
//return 0x40;
//if(xxx==1) return 0x40;
unsigned int final= (mid*256u+low)*528u;
/*
if(nand_read_cnt%100==0){
printf("<cmd60> %d\n",nand_read_cnt);
for(int i=0;i<nand_cmd.size();i++){
printf("<%x>",(unsigned char)nand_cmd[i]);
}
}*/
nand_read_cnt++;
char *p=&nand[0][0];
//printf("final=%x\n",final);
//printf("erase!!! %x tick=%lld pc=%x %x\n",final,tick,nc1020_states.cpu.reg_pc, ram_io[0x00]);
//assert(false);
//final-=32*1024;
assert(final%(32*528)==0);
memset(p+final,0xff,32*528);
nand_cmd.clear();
nand_read_cnt=0;
return 0x40;
}
assert(false);
}
void nand_write(uint8_t value){
if(enable_debug_nand) printf("tick=%llu write $29 %x\n",tick%10000,value);
//printf("tick=%lld, write %x %02x\n",tick, addr, value);
uint8_t roa_bbs=ram_io[0x0a];
uint8_t ramb_vol=ram_io[0x0d];
uint8_t bs=ram_io[0x00];
///////////////// uint16_t p=nc1020_states.cpu.reg_pc-4;
{
if(nand_cmd.size()==0 && value==0xff) {
nand_read_cnt=0;
goto out;
}
/*
ideally we should emulate the CLE ALE CE WE RE etc accodring to the datasheet
but the blow code works pretty stable on official firmware
so I am delaying this and going to implement other important features first
*/
if(nand_cmd.size()>0 && tick-last_tick>=40) { // some magic timeout, which should be removed after the 018h IO is emulated
if(nand_read_cnt!=0&& enable_debug_nand) {
printf("<nand reads %d>\n",nand_read_cnt);
}
if(enable_debug_nand)
{
for(int i=0;i<nand_cmd.size();i++){
printf("<%02x>",(unsigned char)nand_cmd[i]);
}
printf("\n");
}
// robust check: what we dumped is indeed as expected
//if(nand_cmd.size()==7) assert(nand_cmd[6]==0xff);
//else
/* special handle of some invalid sequence in 空间整理*/
//if(nand_cmd.size()==23) assert(nand_cmd[0]==0x50 && nand_cmd.back()==0x10);
//else
if(nand_cmd.size()==5) assert(nand_cmd[0]==0x00||nand_cmd[0]==0x01||nand_cmd[0]==0x50);
else {
assert(false);
}
nand_cmd.clear();
nand_read_cnt=0;
if(value==0xff) goto out;
}
last_tick=tick;
nand_cmd.push_back(value);
if(nand_cmd.size()>6) {
if(nand_cmd[0]==0x00) {
assert(nand_cmd[1]==0x80);
assert(nand_cmd.size()<=535);
}
else if(nand_cmd[0]==0x50) {
assert(nand_cmd[1]==0x80);
assert(nand_cmd.size()<=23);
}
else assert(false);
if(nand_cmd[0]!=0x00&& nand_cmd.size()==23) {
assert(nand_cmd[nand_cmd.size()-1]==0x10);
assert(nand_cmd[1]==0x80);
assert(nand_cmd[0]==0x50);
unsigned char low=nand_cmd[2];
unsigned char mid=nand_cmd[3];
unsigned char high=nand_cmd[4];
uint32_t pos=high*256u+mid;
unsigned int x=pos;
unsigned int y=low;
unsigned int final= pos*528u+ y +512;
assert((final-512)%(528)==0);
char *p=&nand[0][0];
for(int i=0;i<16;i++){
p[final+i]=nand_cmd[6+i];
}
printf("program spare!!!! final=%x\n",final);
nand_cmd.clear();
nand_read_cnt=0;
}
if(nand_cmd.size()==535){
assert(nand_cmd[nand_cmd.size()-1]==0x10);
assert(nand_cmd[0]==0 && nand_cmd[1]==0x80);
unsigned char low=nand_cmd[2];
unsigned char mid=nand_cmd[3];
unsigned char high=nand_cmd[4];
uint32_t pos=high*256u+mid;
unsigned int x=pos;
unsigned int y=low;
unsigned int final= pos*528u+ y;
assert(final%(528)==0);
char *p=&nand[0][0];
printf("program!!!! final=%x\n",final);
for(int i=0;i<528;i++){
p[final+i]=nand_cmd[6+i];
}
nand_cmd.clear();
nand_read_cnt=0;
}
}
}
out:;
//if(nand_cmd.size()==1&& nand_cmd[0]==0xff) nand_cmd.clear();
//printf("bs=%x roa_bbs=%x pc=%x %x %x %x %x \n",ram_io[0x00], ram_io[0x0a], reg_pc, Peek16(p), Peek16(p+1),Peek16(p+2),Peek16(p+3));
//if(do_inject) wanna_inject=true;
}