segatools/amex/eeprom.c
2021-02-13 15:51:16 -05:00

182 lines
3.9 KiB
C

#include <windows.h>
#ifdef __GNUC__
#include <ntdef.h>
#else
#include <winnt.h>
#endif
#include <devioctl.h>
#include <ntdddisk.h>
#include <assert.h>
#include "amex/eeprom.h"
#include "amex/nvram.h"
#include "hook/iohook.h"
#include "hooklib/setupapi.h"
#include "util/dprintf.h"
#include "util/str.h"
static HRESULT eeprom_handle_irp(struct irp *irp);
static HRESULT eeprom_handle_open(struct irp *irp);
static HRESULT eeprom_handle_close(struct irp *irp);
static HRESULT eeprom_handle_ioctl(struct irp *irp);
static HRESULT eeprom_handle_read(struct irp *irp);
static HRESULT eeprom_handle_write(struct irp *irp);
static HRESULT eeprom_ioctl_get_geometry(struct irp *irp);
static struct eeprom_config eeprom_config;
static HANDLE eeprom_file;
HRESULT eeprom_hook_init(const struct eeprom_config *cfg)
{
HRESULT hr;
assert(cfg != NULL);
if (!cfg->enable) {
return S_FALSE;
}
memcpy(&eeprom_config, cfg, sizeof(*cfg));
hr = iohook_push_handler(eeprom_handle_irp);
if (FAILED(hr)) {
return hr;
}
hr = setupapi_add_phantom_dev(&eeprom_guid, L"$eeprom");
if (FAILED(hr)) {
return hr;
}
return S_OK;
}
static HRESULT eeprom_handle_irp(struct irp *irp)
{
assert(irp != NULL);
if (irp->op != IRP_OP_OPEN && irp->fd != eeprom_file) {
return iohook_invoke_next(irp);
}
switch (irp->op) {
case IRP_OP_OPEN: return eeprom_handle_open(irp);
case IRP_OP_CLOSE: return eeprom_handle_close(irp);
case IRP_OP_IOCTL: return eeprom_handle_ioctl(irp);
case IRP_OP_READ: return eeprom_handle_read(irp);
case IRP_OP_WRITE: return eeprom_handle_write(irp);
default: return iohook_invoke_next(irp);
}
}
static HRESULT eeprom_handle_open(struct irp *irp)
{
HRESULT hr;
if (!wstr_eq(irp->open_filename, L"$eeprom") != 0) {
return iohook_invoke_next(irp);
}
if (eeprom_file != NULL) {
dprintf("EEPROM: Already open\n");
return HRESULT_FROM_WIN32(ERROR_SHARING_VIOLATION);
}
dprintf("EEPROM: Open device\n");
hr = nvram_open_file(&eeprom_file, eeprom_config.path, 0x2000);
if (FAILED(hr)) {
return hr;
}
irp->fd = eeprom_file;
return S_OK;
}
static HRESULT eeprom_handle_close(struct irp *irp)
{
dprintf("EEPROM: Close device\n");
eeprom_file = NULL;
return iohook_invoke_next(irp);
}
static HRESULT eeprom_handle_ioctl(struct irp *irp)
{
switch (irp->ioctl) {
case IOCTL_DISK_GET_DRIVE_GEOMETRY:
return eeprom_ioctl_get_geometry(irp);
default:
dprintf("EEPROM: Unknown ioctl %x, write %i read %i\n",
irp->ioctl,
(int) irp->write.nbytes,
(int) irp->read.nbytes);
return HRESULT_FROM_WIN32(ERROR_INVALID_FUNCTION);
}
}
static HRESULT eeprom_ioctl_get_geometry(struct irp *irp)
{
DISK_GEOMETRY out;
HRESULT hr;
dprintf("EEPROM: Get geometry\n");
memset(&out, 0, sizeof(out));
out.Cylinders.QuadPart = 1;
out.MediaType = FixedMedia;
out.TracksPerCylinder = 224;
out.SectorsPerTrack = 32;
out.BytesPerSector = 1;
hr = iobuf_write(&irp->read, &out, sizeof(out));
if (FAILED(hr)) {
dprintf("EEPROM: Get geometry failed: %08x\n", (int) hr);
}
return hr;
}
static HRESULT eeprom_handle_read(struct irp *irp)
{
if (irp->ovl == NULL) {
dprintf("EEPROM: Synchronous read..?\n");
return E_UNEXPECTED;
}
dprintf("EEPROM: Read off %x len %x\n",
(int) irp->ovl->Offset,
(int) irp->read.nbytes);
return iohook_invoke_next(irp);
}
static HRESULT eeprom_handle_write(struct irp *irp)
{
if (irp->ovl == NULL) {
dprintf("EEPROM: Synchronous write..?\n");
return E_UNEXPECTED;
}
dprintf("EEPROM: Write off %x len %x\n",
(int) irp->ovl->Offset,
(int) irp->write.nbytes);
return iohook_invoke_next(irp);
}