segatools/platform/hwreset.c

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#include <windows.h>
#include <assert.h>
#include <string.h>
#include "hook/iohook.h"
#include "platform/hwreset.h"
#include "util/dprintf.h"
#include "util/str.h"
enum {
HWRESET_IOCTL_RESTART = 0x80002000,
};
static HRESULT hwreset_handle_irp(struct irp *irp);
static HRESULT hwreset_handle_open(struct irp *irp);
static HRESULT hwreset_handle_close(struct irp *irp);
static HRESULT hwreset_handle_ioctl(struct irp *irp);
static HRESULT hwreset_ioctl_restart(struct irp *irp);
static HANDLE hwreset_fd;
HRESULT hwreset_hook_init(const struct hwreset_config *cfg)
{
HRESULT hr;
assert(cfg != NULL);
if (!cfg->enable) {
return S_FALSE;
}
hr = iohook_open_nul_fd(&hwreset_fd);
if (FAILED(hr)) {
return hr;
}
hr = iohook_push_handler(hwreset_handle_irp);
if (FAILED(hr)) {
return hr;
}
return S_OK;
}
static HRESULT hwreset_handle_irp(struct irp *irp)
{
assert(irp != NULL);
if (irp->op != IRP_OP_OPEN && irp->fd != hwreset_fd) {
return iohook_invoke_next(irp);
}
switch (irp->op) {
case IRP_OP_OPEN: return hwreset_handle_open(irp);
case IRP_OP_CLOSE: return hwreset_handle_close(irp);
case IRP_OP_IOCTL: return hwreset_handle_ioctl(irp);
default: return HRESULT_FROM_WIN32(ERROR_INVALID_FUNCTION);
}
}
static HRESULT hwreset_handle_open(struct irp *irp)
{
if (!wstr_ieq(irp->open_filename, L"\\\\.\\sghwreset")) {
return iohook_invoke_next(irp);
}
dprintf("Hwreset: Opened device\n");
irp->fd = hwreset_fd;
return S_OK;
}
static HRESULT hwreset_handle_close(struct irp *irp)
{
dprintf("Hwreset: Closed device\n");
return S_OK;
}
static HRESULT hwreset_handle_ioctl(struct irp *irp)
{
switch (irp->ioctl) {
case HWRESET_IOCTL_RESTART:
return hwreset_ioctl_restart(irp);
default:
dprintf("Hwreset: Unknown ioctl %08x, write %i read %i\n",
irp->ioctl,
(int) irp->write.nbytes,
(int) irp->read.nbytes);
return HRESULT_FROM_WIN32(ERROR_INVALID_FUNCTION);
}
}
static HRESULT hwreset_ioctl_restart(struct irp *irp)
{
dprintf("Hwreset: Reset requested\n");
return iobuf_write_le32(&irp->read, 1);
}