segatools/nu/ds.c

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2018-11-08 01:04:54 +00:00
#include <windows.h>
#include <ntstatus.h>
#include <assert.h>
#include <ctype.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "hook/iobuf.h"
#include "hook/iohook.h"
#include "nu/ds.h"
#include "nu/nvram.h"
#include "util/crc.h"
#include "util/dprintf.h"
#include "util/setupapi.h"
#pragma pack(push, 1)
enum {
DS_IOCTL_SETUP = 0x80006004,
DS_IOCTL_READ_SECTOR = 0x80006010,
};
struct ds_eeprom {
uint32_t crc32;
uint8_t unk_04[5];
char serial_no[17];
uint8_t unk_1A[6];
};
static_assert(sizeof(struct ds_eeprom) == 0x20, "DS EEPROM size");
#pragma pack(pop)
static HRESULT ds_handle_irp(struct irp *irp);
static HRESULT ds_handle_open(struct irp *irp);
static HRESULT ds_handle_close(struct irp *irp);
static HRESULT ds_handle_ioctl(struct irp *irp);
static HRESULT ds_ioctl_get_geometry(struct irp *irp);
static HRESULT ds_ioctl_setup(struct irp *irp);
static HRESULT ds_ioctl_read_sector(struct irp *irp);
static const char ds_serial_file[] = "DEVICE/ds.txt";
static struct ds_eeprom ds_eeprom;
static HANDLE ds_fd;
HRESULT ds_hook_init(void)
{
HRESULT hr;
FILE *f;
char c;
int i;
memset(&ds_eeprom, 0, sizeof(ds_eeprom));
f = fopen(ds_serial_file, "r");
if (f != NULL) {
i = 0;
for (;;) {
if (feof(f) || i >= sizeof(ds_eeprom.serial_no) - 1) {
break;
}
c = getc(f);
if (isspace(c)) {
break;
}
ds_eeprom.serial_no[i++] = c;
}
fclose(f);
} else {
dprintf("Failed to open %s\n", ds_serial_file);
}
ds_eeprom.crc32 = crc32(&ds_eeprom.unk_04, 0x1C, 0);
hr = iohook_push_handler(ds_handle_irp);
if (FAILED(hr)) {
return hr;
}
hr = setupapi_add_phantom_dev(&ds_guid, L"$ds");
if (FAILED(hr)) {
return hr;
}
ds_fd = iohook_open_dummy_fd();
return S_OK;
}
static HRESULT ds_handle_irp(struct irp *irp)
{
assert(irp != NULL);
if (irp->op != IRP_OP_OPEN && irp->fd != ds_fd) {
return iohook_invoke_next(irp);
}
switch (irp->op) {
case IRP_OP_OPEN: return ds_handle_open(irp);
case IRP_OP_CLOSE: return ds_handle_close(irp);
case IRP_OP_IOCTL: return ds_handle_ioctl(irp);
default: return HRESULT_FROM_WIN32(ERROR_INVALID_FUNCTION);
}
}
static HRESULT ds_handle_open(struct irp *irp)
{
if (wcscmp(irp->open_filename, L"$ds") != 0) {
return iohook_invoke_next(irp);
}
dprintf("DS: Open device\n");
irp->fd = ds_fd;
return S_OK;
}
static HRESULT ds_handle_close(struct irp *irp)
{
dprintf("DS: Close device\n");
return S_OK;
}
static HRESULT ds_handle_ioctl(struct irp *irp)
{
switch (irp->ioctl) {
case IOCTL_DISK_GET_DRIVE_GEOMETRY:
return ds_ioctl_get_geometry(irp);
case DS_IOCTL_SETUP:
return ds_ioctl_setup(irp);
case DS_IOCTL_READ_SECTOR:
return ds_ioctl_read_sector(irp);
default:
dprintf("DS: Unknown ioctl %x, write %i read %i\n",
irp->ioctl,
irp->write.nbytes,
irp->read.nbytes);
return HRESULT_FROM_WIN32(ERROR_INVALID_FUNCTION);
}
}
static HRESULT ds_ioctl_get_geometry(struct irp *irp)
{
DISK_GEOMETRY *out;
if (irp->read.nbytes < sizeof(*out)) {
dprintf("DS: Invalid ioctl response buffer size\n");
return HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER);
}
dprintf("DS: Get geometry\n");
out = (DISK_GEOMETRY *) irp->read.bytes;
out->Cylinders.QuadPart = 1;
out->MediaType = 0;
out->TracksPerCylinder = 1;
out->SectorsPerTrack = 2;
out->BytesPerSector = 32;
irp->read.pos = sizeof(*out);
return S_OK;
}
static HRESULT ds_ioctl_setup(struct irp *irp)
{
dprintf("DS: Setup IOCTL\n");
return S_OK;
}
static HRESULT ds_ioctl_read_sector(struct irp *irp)
{
struct const_iobuf src;
uint32_t sector_no;
HRESULT hr;
hr = iobuf_read_le32(&irp->write, &sector_no);
if (FAILED(hr)) {
return hr;
}
dprintf("DS: Read sector %08x\n", sector_no);
src.bytes = (const uint8_t *) &ds_eeprom;
src.nbytes = sizeof(ds_eeprom);
src.pos = 0;
iobuf_move(&irp->read, &src);
if (irp->ovl != NULL) {
irp->ovl->Internal = STATUS_SUCCESS;
irp->ovl->InternalHigh = irp->read.pos;
if (irp->ovl->hEvent != NULL) {
SetEvent(irp->ovl->hEvent);
}
}
return S_OK;
}