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/* VBOX driver interface - synchronous version - by D.C. van Moolenbroek */
#include <minix/drivers.h>
#include <minix/vboxtype.h>
#include <minix/vboxif.h>
#include <minix/vbox.h>
#include <minix/ds.h>
#include <assert.h>
static endpoint_t vbox_endpt = NONE;
int vbox_init(void)
{
/* Initialize the library, by resolving the VBOX driver endpoint.
*/
int r;
if ((r = ds_retrieve_label_endpt("vbox", &vbox_endpt)) != OK) {
printf("libvbox: unable to obtain VBOX endpoint (%d)\n", r);
return EINVAL;
}
return OK;
}
vbox_conn_t vbox_open(const char *name)
{
/* Open a VirtualBox HGCM connection.
*/
message m;
cp_grant_id_t grant;
size_t len;
int r;
if (vbox_endpt == NONE)
return EDEADSRCDST;
len = strlen(name) + 1;
grant = cpf_grant_direct(vbox_endpt, (vir_bytes) name, len, CPF_READ);
if (!GRANT_VALID(grant))
return ENOMEM;
memset(&m, 0, sizeof(m));
m.m_type = VBOX_OPEN;
m.VBOX_GRANT = grant;
m.VBOX_COUNT = len;
m.VBOX_ID = 0;
r = ipc_sendrec(vbox_endpt, &m);
cpf_revoke(grant);
if (r != OK)
return r;
if (m.VBOX_ID != 0)
return EINVAL;
return m.VBOX_RESULT;
}
int vbox_close(vbox_conn_t conn)
{
/* Close a VirtualBox HGCM connection.
*/
message m;
int r;
if (vbox_endpt == NONE)
return EDEADSRCDST;
memset(&m, 0, sizeof(m));
m.m_type = VBOX_CLOSE;
m.VBOX_CONN = conn;
m.VBOX_ID = 0;
r = ipc_sendrec(vbox_endpt, &m);
if (r != OK)
return r;
if (m.VBOX_ID != 0)
return EINVAL;
return m.VBOX_RESULT;
}
int vbox_call(vbox_conn_t conn, u32_t function, vbox_param_t *param, int count,
int *code)
{
/* Call a VirtualBox HGCM function. The caller must set up all buffer grants.
*/
cp_grant_id_t grant = GRANT_INVALID;
message m;
int i, r;
if (vbox_endpt == NONE) {
vbox_put(param, count);
return EDEADSRCDST;
}
/* Check whether all parameters are initialized correctly. */
for (i = 0; i < count; i++) {
switch (param[i].type) {
case VBOX_TYPE_U32:
case VBOX_TYPE_U64:
case VBOX_TYPE_PTR:
break;
default:
vbox_put(param, count);
return ENOMEM;
}
}
if (count > 0) {
grant = cpf_grant_direct(vbox_endpt, (vir_bytes) param,
sizeof(param[0]) * count, CPF_READ | CPF_WRITE);
if (!GRANT_VALID(grant)) {
vbox_put(param, count);
return ENOMEM;
}
}
memset(&m, 0, sizeof(m));
m.m_type = VBOX_CALL;
m.VBOX_CONN = conn;
m.VBOX_GRANT = grant;
m.VBOX_COUNT = count;
m.VBOX_ID = 0;
m.VBOX_FUNCTION = function;
r = ipc_sendrec(vbox_endpt, &m);
if (GRANT_VALID(grant))
cpf_revoke(grant);
vbox_put(param, count);
if (r != OK)
return r;
if (m.VBOX_ID != 0)
return EINVAL;
if (code != NULL)
*code = m.VBOX_CODE;
return m.VBOX_RESULT;
}
void vbox_set_u32(vbox_param_t *param, u32_t value)
{
/* Set the given parameter to a 32-bit value.
*/
param->type = VBOX_TYPE_U32;
param->u32 = value;
}
void vbox_set_u64(vbox_param_t *param, u64_t value)
{
/* Set the given parameter to a 32-bit value.
*/
param->type = VBOX_TYPE_U64;
param->u64 = value;
}
void vbox_set_ptr(vbox_param_t *param, void *ptr, size_t size,
unsigned int dir)
{
/* Set the given parameter to a grant for the given local pointer.
*/
cp_grant_id_t grant = GRANT_INVALID;
int flags;
flags = 0;
if (dir & VBOX_DIR_IN) flags |= CPF_WRITE;
if (dir & VBOX_DIR_OUT) flags |= CPF_READ;
if (size > 0) {
grant = cpf_grant_direct(vbox_endpt, (vir_bytes) ptr, size, flags);
if (!GRANT_VALID(grant)) {
param->type = VBOX_TYPE_INVALID;
return;
}
}
param->type = VBOX_TYPE_PTR;
param->ptr.grant = grant;
param->ptr.off = 0;
param->ptr.size = size;
param->ptr.dir = dir;
}
void vbox_set_grant(vbox_param_t *param, endpoint_t endpt, cp_grant_id_t grant,
size_t off, size_t size, unsigned int dir)
{
/* Set the given parameter to an indirect grant for the given grant.
*/
cp_grant_id_t indir_grant;
/* Unfortunately, the current implementation of indirect grants does not
* support making smaller subgrants out of larger original grants. Therefore,
* we are forced to grant more access than we would like.
*/
indir_grant = cpf_grant_indirect(vbox_endpt, endpt, grant);
if (!GRANT_VALID(indir_grant)) {
param->type = VBOX_TYPE_INVALID;
return;
}
param->type = VBOX_TYPE_PTR;
param->ptr.grant = indir_grant;
param->ptr.off = off;
param->ptr.size = size;
param->ptr.dir = dir;
}
void vbox_put(vbox_param_t *param, int count)
{
/* Free all resources used for the given parameters.
*/
while (count--) {
if (param->type == VBOX_TYPE_PTR && GRANT_VALID(param->ptr.grant))
cpf_revoke(param->ptr.grant);
param++;
}
}
u32_t vbox_get_u32(vbox_param_t *param)
{
/* Retrieve the 32-bit value from the given parameter.
*/
assert(param->type == VBOX_TYPE_U32);
return param->u32;
}
u64_t vbox_get_u64(vbox_param_t *param)
{
/* Retrieve the 64-bit value from the given parameter.
*/
assert(param->type == VBOX_TYPE_U64);
return param->u64;
}
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