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/*
* VBMouse - VirtualBox communication routines
* Copyright (C) 2022 Javier S. Pedro
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include <i86.h>
#include "dlog.h"
#include "utils.h"
#include "int1Apci.h"
#include "int4Bvds.h"
#include "vboxdev.h"
#include "vbox.h"
// Classic PCI defines
#define VBOX_PCI_VEND_ID 0x80ee
#define VBOX_PCI_PROD_ID 0xcafe
enum {
CFG_COMMAND = 0x04, /* Word */
CFG_INTERRUPT = 0x3C, /* Byte */
CFG_BAR0 = 0x10, /* DWord */
CFG_BAR1 = 0x14, /* DWord */
};
int vbox_init_device(LPVBOXCOMM vb)
{
int err;
pcisel pcidev;
uint16_t command;
uint32_t bar;
if ((err = pci_init_bios())) {
return err;
}
if ((err = pci_find_device(&pcidev, VBOX_PCI_VEND_ID, VBOX_PCI_PROD_ID, 0))) {
return err;
}
if ((err = pci_read_config_word(pcidev, CFG_COMMAND, &command))) {
return err;
}
if (!(command & 1)) {
// The card is not configured
return -1;
}
if ((err = pci_read_config_dword(pcidev, CFG_BAR0, &bar))) {
return err;
}
if (!(bar & 1)) {
// This is not an IO BAR
return -2;
}
vb->iobase = bar & 0xFFFC;
return 0;
}
int vbox_init_buffer(LPVBOXCOMM vb, unsigned size)
{
vb->dds.regionSize = size;
vb->dds.segOrSelector = FP_SEG(&vb->buf);
vb->dds.offset = FP_OFF(&vb->buf);
vb->dds.bufferId = 0;
vb->dds.physicalAddress = 0;
vb->vds = false;
if (vds_available()) {
// Use the Virtual DMA Service to get the physical address of this buffer
int err;
err = vds_lock_dma_buffer_region(&vb->dds, VDS_NO_AUTO_ALLOC);
if (err) {
// As far as I have seen, most VDS providers always keep low memory contiguous,
// so I'm not handling VDS_REGION_NOT_CONTIGUOUS here.
dlog_print("Error while VDS locking, err=");
dlog_printd(err);
dlog_endline();
return err;
}
vb->vds = true;
} else {
// If VDS is not available,
// we assume a 1:1 mapping between linear and physical addresses
vb->dds.physicalAddress = linear_addr(&vb->buf);
}
return 0;
}
int vbox_release_buffer(LPVBOXCOMM vb)
{
if (vb->vds && vds_available()) {
int err = vds_unlock_dma_buffer_region(&vb->dds, 0);
if (err) {
dlog_print("Error while VDS unlocking, err=");
dlog_printd(err);
dlog_endline();
// Ignore the error, it's not like we can do anything
}
}
vb->vds = false;
vb->dds.regionSize = 0;
vb->dds.segOrSelector = 0;
vb->dds.offset = 0;
vb->dds.bufferId = 0;
vb->dds.physicalAddress = 0;
return 0;
}
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