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