forked from Hay1tsme/segatools
161 lines
3.3 KiB
C
161 lines
3.3 KiB
C
#include <windows.h>
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#ifdef __GNUC__
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#include <ntdef.h>
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#else
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#include <winnt.h>
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#endif
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#include <devioctl.h>
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#include <ntdddisk.h>
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#include <assert.h>
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#include "amex/sram.h"
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#include "amex/nvram.h"
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#include "hook/iohook.h"
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#include "hooklib/setupapi.h"
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#include "util/dprintf.h"
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#include "util/str.h"
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enum {
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SRAM_IOCTL_GET_ABI_VERSION = 0x80006000,
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};
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static HRESULT sram_handle_irp(struct irp *irp);
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static HRESULT sram_handle_open(struct irp *irp);
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static HRESULT sram_handle_close(struct irp *irp);
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static HRESULT sram_handle_ioctl(struct irp *irp);
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static HRESULT sram_ioctl_get_geometry(struct irp *irp);
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static HRESULT sram_ioctl_get_abi_version(struct irp *irp);
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static struct sram_config sram_config;
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static HANDLE sram_file;
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HRESULT sram_hook_init(const struct sram_config *cfg)
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{
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HRESULT hr;
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assert(cfg != NULL);
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if (!cfg->enable) {
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return S_FALSE;
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}
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memcpy(&sram_config, cfg, sizeof(*cfg));
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hr = iohook_push_handler(sram_handle_irp);
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if (FAILED(hr)) {
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return hr;
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}
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hr = setupapi_add_phantom_dev(&sram_guid, L"$sram");
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if (FAILED(hr)) {
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return hr;
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}
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return S_OK;
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}
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static HRESULT sram_handle_irp(struct irp *irp)
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{
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assert(irp != NULL);
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if (irp->op != IRP_OP_OPEN && irp->fd != sram_file) {
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return iohook_invoke_next(irp);
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}
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switch (irp->op) {
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case IRP_OP_OPEN: return sram_handle_open(irp);
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case IRP_OP_CLOSE: return sram_handle_close(irp);
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case IRP_OP_IOCTL: return sram_handle_ioctl(irp);
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default: return iohook_invoke_next(irp);
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}
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}
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static HRESULT sram_handle_open(struct irp *irp)
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{
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HRESULT hr;
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if (!wstr_eq(irp->open_filename, L"$sram")) {
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return iohook_invoke_next(irp);
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}
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if (sram_file != NULL) {
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dprintf("SRAM: Already open\n");
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return HRESULT_FROM_WIN32(ERROR_SHARING_VIOLATION);
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}
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dprintf("SRAM: Open device\n");
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hr = nvram_open_file(&sram_file, sram_config.path, 0x80000);
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if (FAILED(hr)) {
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return hr;
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}
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irp->fd = sram_file;
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return S_OK;
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}
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static HRESULT sram_handle_close(struct irp *irp)
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{
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dprintf("SRAM: Close device\n");
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sram_file = NULL;
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return iohook_invoke_next(irp);
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}
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static HRESULT sram_handle_ioctl(struct irp *irp)
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{
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switch (irp->ioctl) {
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case IOCTL_DISK_GET_DRIVE_GEOMETRY:
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return sram_ioctl_get_geometry(irp);
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case SRAM_IOCTL_GET_ABI_VERSION:
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return sram_ioctl_get_abi_version(irp);
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default:
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dprintf("SRAM: Unknown ioctl %x, write %i read %i\n",
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irp->ioctl,
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(int) irp->write.nbytes,
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(int) irp->read.nbytes);
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return HRESULT_FROM_WIN32(ERROR_INVALID_FUNCTION);
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}
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}
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static HRESULT sram_ioctl_get_geometry(struct irp *irp)
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{
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DISK_GEOMETRY out;
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HRESULT hr;
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dprintf("SRAM: Get geometry\n");
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memset(&out, 0, sizeof(out));
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out.Cylinders.QuadPart = 0x20000;
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out.MediaType = 0;
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out.TracksPerCylinder = 1;
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out.SectorsPerTrack = 1;
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out.BytesPerSector = 4;
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hr = iobuf_write(&irp->read, &out, sizeof(out));
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if (FAILED(hr)) {
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dprintf("SRAM: Get geometry failed: %08x\n", (int) hr);
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}
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return hr;
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}
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static HRESULT sram_ioctl_get_abi_version(struct irp *irp)
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{
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return iobuf_write_le16(&irp->read, 256);
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}
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