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Simplified PRAM emulation

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dingusdev 2020-01-13 19:48:29 -07:00
parent 1cff216e82
commit 5b8a787e9a
2 changed files with 7 additions and 61 deletions
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58
devices/viacuda.cpp
View File

@ -18,9 +18,6 @@
using namespace std;
/** the signature for PRAM backing file identification. */
static char PRAM_FILE_ID[] = "DINGUSPPCP-RAM";
ViaCuda::ViaCuda(std::string pram_file, uint32_t pram_size)
{
/* FIXME: is this the correct
@ -33,10 +30,7 @@ ViaCuda::ViaCuda(std::string pram_file, uint32_t pram_size)
this->via_regs[VIA_IER] = 0x7F;
//PRAM Pre-Initialization
this->pram_file = pram_file;
this->pram_size = pram_size;
this->pram_storage = new uint8_t[pram_size];
this->pram_obj = NVram("pram.bin", 256);
this->cuda_init();
}
@ -49,30 +43,6 @@ void ViaCuda::cuda_init()
this->in_count = 0;
this->out_count = 0;
//PRAM Initialization
char sig[sizeof(PRAM_FILE_ID)];
uint16_t data_size;
ifstream f(this->pram_file, ios::in | ios::binary);
if (f.fail() || !f.read(sig, sizeof(PRAM_FILE_ID)) ||
!f.read((char*)&data_size, sizeof(data_size)) ||
memcmp(sig, PRAM_FILE_ID, sizeof(PRAM_FILE_ID)) ||
data_size != this->pram_size ||
!f.read((char*)this->pram_storage, this->pram_size))
{
cout << "WARN: Could not restore PRAM content from the given file." << endl;
memset(this->pram_storage, 0, sizeof(this->pram_size));
}
f.close();
}
ViaCuda::~ViaCuda()
{
this->cuda_pram_save();
if (this->pram_storage)
delete this->pram_storage;
}
uint8_t ViaCuda::read(int reg)
@ -275,11 +245,11 @@ void ViaCuda::cuda_pseudo_command(int cmd, int data_count)
switch(cmd) {
case CUDA_READ_PRAM:
cuda_response_header(CUDA_PKT_PSEUDO, 0);
pram_read_value(this->in_buf[2]);
this->pram_obj.read_byte(this->in_buf[2]);
break;
case CUDA_WRITE_PRAM:
cuda_response_header(CUDA_PKT_PSEUDO, 0);
pram_write_value(this->in_buf[2], this->in_buf[3]);
this->pram_obj.write_byte(this->in_buf[2], this->in_buf[3]);
break;
case CUDA_READ_WRITE_I2C:
cuda_response_header(CUDA_PKT_PSEUDO, 0);
@ -313,14 +283,6 @@ void ViaCuda::cuda_pseudo_command(int cmd, int data_count)
}
}
uint8_t ViaCuda::pram_read_value(uint8_t offset) {
return pram_storage[offset];
}
void ViaCuda::pram_write_value(uint8_t offset, uint8_t new_state) {
pram_storage[offset] = new_state;
}
void ViaCuda::i2c_simple_transaction(uint8_t dev_addr, const uint8_t *in_buf,
int in_bytes)
{
@ -373,18 +335,4 @@ void ViaCuda::i2c_comb_transaction(uint8_t dev_addr, uint8_t sub_addr,
cout << "Unsupported I2C device 0x" << hex << (int)dev_addr1 << endl;
cuda_error_response(CUDA_ERR_I2C);
}
}
void ViaCuda::cuda_pram_save()
{
ofstream f(this->pram_file, ios::out | ios::binary);
/* write file identification */
f.write(PRAM_FILE_ID, sizeof(PRAM_FILE_ID));
f.write((char*)&this->pram_size, sizeof(this->pram_size));
/* write PRAM content */
f.write((char*)this->pram_storage, this->pram_size);
f.close();
}

10
devices/viacuda.h
View File

@ -28,6 +28,8 @@
firmware using bit banging (https://en.wikipedia.org/wiki/Bit_banging).
*/
#include "nvram.h"
#ifndef VIACUDA_H
#define VIACUDA_H
@ -87,7 +89,7 @@ class ViaCuda
{
public:
ViaCuda(std::string pram_file = "pram.bin", uint32_t pram_size = 256);
~ViaCuda();
~ViaCuda() = default;
uint8_t read(int reg);
void write(int reg, uint8_t value);
@ -105,9 +107,7 @@ private:
int32_t out_count;
int32_t out_pos;
std::string pram_file; /* file name for the PRAM file. */
uint8_t pram_size; /* PRAM size. */
uint8_t* pram_storage;
NVram pram_obj;
void print_enabled_ints(); /* print enabled VIA interrupts and their sources */
@ -122,8 +122,6 @@ private:
void cuda_pram_save();
/* I2C related methods */
uint8_t pram_read_value(uint8_t offset);
void pram_write_value(uint8_t offset, uint8_t new_state);
void i2c_simple_transaction(uint8_t dev_addr, const uint8_t *in_buf, int in_bytes);
void i2c_comb_transaction(uint8_t dev_addr, uint8_t sub_addr, uint8_t dev_addr1,
const uint8_t *in_buf, int in_bytes);