diff options
Diffstat (limited to 'vbox.c')
| -rw-r--r-- | vbox.c | 219 |
1 files changed, 130 insertions, 89 deletions
@@ -19,11 +19,14 @@ #include <windows.h> #include <i86.h> +#include <string.h> #include "pci.h" +#include "vds.h" #include "vboxdev.h" #include "vbox.h" +// PCI device information /** VBox's PCI bus, device number, etc. */ static pcisel vbpci; /** IO base of VBox's PCI device. */ @@ -31,14 +34,16 @@ static uint16_t vbiobase; /** IRQ number of VBox's PCI device. Unused. */ static uint8_t vbirq; -/** Keep a pre-allocated VBox VMMDevRequest struct for the benefit of the callbacks, - which may be called in a IRQ handler where I'd prefer to avoid making API calls. */ -static VMMDevReqMouseStatus __far * reqMouse; -static HANDLE reqMouseH; -static uint32_t reqMouseAddr; +/** Handle to fixed buffer used for communication with VBox device. + * We also use Virtual DMA Service to obtain the physical address of this buffer, + * so it must remain fixed in memory. */ +static HANDLE hBuf; +static LPVOID pBuf; +/** The DMA descriptor used by VDS corresponding to the above buffer. */ +static VDS_DDS bufdds; /** Actually send a request to the VirtualBox VMM device. - * @param addr 32-bit linear address containing the VMMDevRequest struct. + * @param addr 32-bit physical address containing the VMMDevRequest struct. */ static void vbox_send_request(uint32_t addr); #pragma aux vbox_send_request = \ @@ -61,7 +66,7 @@ static uint32_t vbox_irq_ack(); "in eax, dx" \ "mov edx, eax" \ "shr edx, 16" \ - __value [dx ax] \ + __value [dx ax] // Classic PCI defines #define VBOX_PCI_VEND_ID 0x80ee @@ -73,21 +78,6 @@ enum { CFG_BAR1 = 0x14, /* DWord */ }; -/** Gets the 32-bit linear address of a 16:16 far pointer. - Uses GetSelectorBase() since we are supposed to work under protected mode. */ -static inline uint32_t get_physical_addr(void far *obj) -{ - return GetSelectorBase(FP_SEG(obj)) + FP_OFF(obj); -} - -/** Send a request to the VirtualBox VMM device at vbiobase. - * @param request must be a VMMDevRequest (e.g. VMMDevReqMouseStatus). */ -static inline void vbox_request(void far *request) -{ - uint32_t addr = get_physical_addr(request); - vbox_send_request(addr); -} - /** Finds the VirtualBox PCI device and reads the current IO base. * @returns 0 if the device was found. */ int vbox_init(void) @@ -126,56 +116,118 @@ int vbox_init(void) return 0; } +/** Allocates the buffers that will be used to communicate with the VirtualBox device. */ +int vbox_alloc_buffers(void) +{ + const unsigned int bufferSize = 48; // This should be the largest of all VMMDevRequest* structs that we can send + int err; + + // Allocate the buffer + hBuf = GlobalAlloc(GMEM_FIXED|GMEM_SHARE, bufferSize); + if (!hBuf) return -1; + + // Keep it in memory at a fixed location + GlobalFix(hBuf); + GlobalPageLock(hBuf); + + // Get the usable pointer / logical address of the buffer + pBuf = (LPVOID) GlobalLock(hBuf); + + if (vds_available()) { + // Use the Virtual DMA Service to get the physical address of this buffer + bufdds.regionSize = bufferSize; + bufdds.segOrSelector = FP_SEG(pBuf); + bufdds.offset = FP_OFF(pBuf); + bufdds.bufferId = 0; + bufdds.physicalAddress = 0; + + err = vds_lock_dma_buffer_region(&bufdds, VDS_NO_AUTO_ALLOC | VDS_NO_AUTO_REMAP); + } else { + bufdds.regionSize = 0; // Indicates we don't have to unlock this later on + + // If VDS is not available, assume we are not paging + // Just use the linear address as physical + bufdds.physicalAddress = GetSelectorBase(FP_SEG(pBuf)) + FP_OFF(pBuf); + err = 0; + } + + return err; +} + +/** Frees the buffers allocated by vbox_alloc_buffers(). */ +int vbox_free_buffers(void) +{ + if (bufdds.regionSize > 0) { + vds_unlock_dma_buffer_region(&bufdds, 0); + } + bufdds.regionSize = 0; + bufdds.segOrSelector = 0; + bufdds.offset = 0; + bufdds.bufferId = 0; + bufdds.physicalAddress = 0; + GlobalFree(hBuf); + hBuf = NULL; + pBuf = NULL; + + return 0; +} + /** Lets VirtualBox know that there are VirtualBox Guest Additions on this guest. * @param osType os installed on this guest. */ int vbox_report_guest_info(uint32_t osType) { - VMMDevReportGuestInfo req = {0}; + VMMDevReportGuestInfo *req = pBuf; + + memset(req, 0, sizeof(VMMDevReportGuestInfo)); - req.header.size = sizeof(req); - req.header.version = VMMDEV_REQUEST_HEADER_VERSION; - req.header.requestType = VMMDevReq_ReportGuestInfo; - req.header.rc = -1; - req.guestInfo.interfaceVersion = VMMDEV_VERSION; - req.guestInfo.osType = osType; + req->header.size = sizeof(VMMDevReportGuestInfo); + req->header.version = VMMDEV_REQUEST_HEADER_VERSION; + req->header.requestType = VMMDevReq_ReportGuestInfo; + req->header.rc = -1; + req->guestInfo.interfaceVersion = VMMDEV_VERSION; + req->guestInfo.osType = osType; - vbox_request(&req); + vbox_send_request(bufdds.physicalAddress); - return req.header.rc; + return req->header.rc; } /** Tells VirtualBox about the events we are interested in receiving. These events are notified via the PCI IRQ which we are not using, so this is not used either. */ int vbox_set_filter_mask(uint32_t add, uint32_t remove) { - VMMDevCtlGuestFilterMask req = {0}; + VMMDevCtlGuestFilterMask *req = pBuf; - req.header.size = sizeof(req); - req.header.version = VMMDEV_REQUEST_HEADER_VERSION; - req.header.requestType = VMMDevReq_CtlGuestFilterMask; - req.header.rc = -1; - req.u32OrMask = add; - req.u32NotMask = remove; + memset(req, 0, sizeof(VMMDevCtlGuestFilterMask)); - vbox_request(&req); + req->header.size = sizeof(VMMDevCtlGuestFilterMask); + req->header.version = VMMDEV_REQUEST_HEADER_VERSION; + req->header.requestType = VMMDevReq_CtlGuestFilterMask; + req->header.rc = -1; + req->u32OrMask = add; + req->u32NotMask = remove; - return req.header.rc; + vbox_send_request(bufdds.physicalAddress); + + return req->header.rc; } /** Tells VirtualBox whether we want absolute mouse information or not. */ int vbox_set_mouse(bool enable) { - VMMDevReqMouseStatus req = {0}; + VMMDevReqMouseStatus *req = pBuf; + + memset(req, 0, sizeof(VMMDevReqMouseStatus)); - req.header.size = sizeof(req); - req.header.version = VMMDEV_REQUEST_HEADER_VERSION; - req.header.requestType = VMMDevReq_SetMouseStatus; - req.header.rc = -1; - req.mouseFeatures = enable ? VMMDEV_MOUSE_GUEST_CAN_ABSOLUTE : 0; + req->header.size = sizeof(VMMDevReqMouseStatus); + req->header.version = VMMDEV_REQUEST_HEADER_VERSION; + req->header.requestType = VMMDevReq_SetMouseStatus; + req->header.rc = -1; + req->mouseFeatures = enable ? VMMDEV_MOUSE_GUEST_CAN_ABSOLUTE : 0; - vbox_request(&req); + vbox_send_request(bufdds.physicalAddress); - return req.header.rc; + return req->header.rc; } /** Gets the current absolute mouse position from VirtualBox. @@ -183,57 +235,46 @@ int vbox_set_mouse(bool enable) * in which case we should fallback to PS/2 relative events. */ int vbox_get_mouse(bool *abs, uint16_t *xpos, uint16_t *ypos) { - VMMDevReqMouseStatus req = {0}; + VMMDevReqMouseStatus *req = pBuf; - req.header.size = sizeof(req); - req.header.version = VMMDEV_REQUEST_HEADER_VERSION; - req.header.requestType = VMMDevReq_GetMouseStatus; - req.header.rc = -1; + memset(req, 0, sizeof(VMMDevReqMouseStatus)); - vbox_request(&req); + req->header.size = sizeof(VMMDevReqMouseStatus); + req->header.version = VMMDEV_REQUEST_HEADER_VERSION; + req->header.requestType = VMMDevReq_GetMouseStatus; + req->header.rc = -1; - *abs = req.mouseFeatures & VMMDEV_MOUSE_HOST_WANTS_ABSOLUTE; - *xpos = req.pointerXPos; - *ypos = req.pointerYPos; + vbox_send_request(bufdds.physicalAddress); - return req.header.rc; -} + *abs = req->mouseFeatures & VMMDEV_MOUSE_HOST_WANTS_ABSOLUTE; + *xpos = req->pointerXPos; + *ypos = req->pointerYPos; -/** Just allocates the memory used by vbox_get_mouse_locked below. */ -void vbox_init_callbacks(void) -{ - reqMouseH = GlobalAlloc(GMEM_FIXED|GMEM_SHARE, sizeof(VMMDevReqMouseStatus)); - reqMouse = (LPVOID) GlobalLock(reqMouseH); - reqMouseAddr = get_physical_addr(reqMouse); -} - -void vbox_deinit_callbacks(void) -{ - GlobalFree(reqMouseH); - reqMouse = NULL; - reqMouseAddr = 0; + return req->header.rc; } #pragma code_seg ( "CALLBACKS" ) -/** This is a version of vbox_get_mouse() that does not call any other functions. */ +/** This is a version of vbox_get_mouse() that does not call any other functions, + * and may be called inside an interrupt handler. */ int vbox_get_mouse_locked(bool *abs, uint16_t *xpos, uint16_t *ypos) { - // Note that this may be called with interrupts disabled - reqMouse->header.size = sizeof(VMMDevReqMouseStatus); - reqMouse->header.version = VMMDEV_REQUEST_HEADER_VERSION; - reqMouse->header.requestType = VMMDevReq_GetMouseStatus; - reqMouse->header.rc = -1; - reqMouse->mouseFeatures = 0; - reqMouse->pointerXPos = 0; - reqMouse->pointerYPos = 0; - - vbox_send_request(reqMouseAddr); - - *abs = reqMouse->mouseFeatures & VMMDEV_MOUSE_HOST_WANTS_ABSOLUTE; - *xpos = reqMouse->pointerXPos; - *ypos = reqMouse->pointerYPos; - - return reqMouse->header.rc; + VMMDevReqMouseStatus *req = pBuf; + + req->header.size = sizeof(VMMDevReqMouseStatus); + req->header.version = VMMDEV_REQUEST_HEADER_VERSION; + req->header.requestType = VMMDevReq_GetMouseStatus; + req->header.rc = -1; + req->mouseFeatures = 0; + req->pointerXPos = 0; + req->pointerYPos = 0; + + vbox_send_request(bufdds.physicalAddress); + + *abs = req->mouseFeatures & VMMDEV_MOUSE_HOST_WANTS_ABSOLUTE; + *xpos = req->pointerXPos; + *ypos = req->pointerYPos; + + return req->header.rc; } |