int user_port_get_next_port_info(proc_id uproc,
uint32 *ucookie,
struct port_info *uinfo)
{
int res;
struct port_info info;
uint32 cookie;
int rc;
if (ucookie == NULL)
return ERR_INVALID_ARGS;
if (uinfo == NULL)
return ERR_INVALID_ARGS;
if(is_kernel_address(ucookie))
return ERR_VM_BAD_USER_MEMORY;
if(is_kernel_address(uinfo))
return ERR_VM_BAD_USER_MEMORY;
// copy from userspace
rc = user_memcpy(&cookie, ucookie, sizeof(uint32));
if(rc < 0)
return rc;
res = port_get_next_port_info(uproc, &cookie, &info);
// copy to userspace
rc = user_memcpy(ucookie, &info, sizeof(uint32));
if(rc < 0)
return rc;
rc = user_memcpy(uinfo, &info, sizeof(struct port_info));
if(rc < 0)
return rc;
return res;
}
ssize_t user_port_read_etc(port_id uport, int32 *umsg_code, void *umsg_buffer,
size_t ubuffer_size, uint32 uflags, bigtime_t utimeout)
{
ssize_t res;
int32 msg_code;
int rc;
if (umsg_code == NULL)
return ERR_INVALID_ARGS;
if (umsg_buffer == NULL)
return ERR_INVALID_ARGS;
if(is_kernel_address(umsg_code))
return ERR_VM_BAD_USER_MEMORY;
if(is_kernel_address(umsg_buffer))
return ERR_VM_BAD_USER_MEMORY;
res = port_read_etc(uport, &msg_code, umsg_buffer, ubuffer_size,
uflags | PORT_FLAG_USE_USER_MEMCPY | SEM_FLAG_INTERRUPTABLE, utimeout);
rc = user_memcpy(umsg_code, &msg_code, sizeof(int32));
if(rc < 0)
return rc;
return res;
}
static int vesa_ioctl(dev_cookie cookie, int op, void *buf, size_t len)
{
int err = 0;
if(!vesa.enabled)
return ERR_NOT_FOUND;
switch(op) {
case IOCTL_DEVFS_GET_FRAMEBUFFER_INFO:
if(is_kernel_address(buf))
err = ERR_VM_BAD_USER_MEMORY;
else
err = user_memcpy(buf, &vesa.fb_info, sizeof(vesa.fb_info));
break;
case IOCTL_DEVFS_MAP_FRAMEBUFFER: {
aspace_id aid = vm_get_current_user_aspace_id();
region_id rid;
void *address;
if(is_kernel_address(buf)) {
err = ERR_VM_BAD_USER_MEMORY;
goto out;
}
// map the framebuffer into the user's address space
rid = vm_map_physical_memory(aid, "vesa_fb", &address, REGION_ADDR_ANY_ADDRESS,
vesa.phys_memory.size, LOCK_RW, vesa.phys_memory.start);
if(rid < 0) {
err = rid;
goto out;
}
// copy the new pointer back to the user
err = user_memcpy(buf, &address, sizeof(address));
if(err < 0) {
vm_delete_region(aid, rid);
goto out;
}
// return the region id as the return code
err = rid;
break;
}
default:
err = ERR_INVALID_ARGS;
}
out:
return err;
}
int user_port_write_etc(port_id uport, int32 umsg_code, void *umsg_buffer,
size_t ubuffer_size, uint32 uflags, bigtime_t utimeout)
{
if (umsg_buffer == NULL)
return ERR_INVALID_ARGS;
if(is_kernel_address(umsg_buffer))
return ERR_VM_BAD_USER_MEMORY;
return port_write_etc(uport, umsg_code, umsg_buffer, ubuffer_size,
uflags | PORT_FLAG_USE_USER_MEMCPY | SEM_FLAG_INTERRUPTABLE, utimeout);
}
int user_port_get_info(port_id id, struct port_info *uinfo)
{
int res;
struct port_info info;
int rc;
if (uinfo == NULL)
return ERR_INVALID_ARGS;
if(is_kernel_address(uinfo))
return ERR_VM_BAD_USER_MEMORY;
res = port_get_info(id, &info);
// copy to userspace
rc = user_memcpy(uinfo, &info, sizeof(struct port_info));
if(rc < 0)
return rc;
return res;
}
port_id user_port_find(const char *port_name)
{
if(port_name != NULL) {
char name[SYS_MAX_OS_NAME_LEN];
int rc;
if(is_kernel_address(port_name))
return ERR_VM_BAD_USER_MEMORY;
rc = user_strncpy(name, port_name, SYS_MAX_OS_NAME_LEN-1);
if(rc < 0)
return rc;
name[SYS_MAX_OS_NAME_LEN-1] = 0;
return port_find(name);
} else {
return ERR_INVALID_ARGS;
}
}
port_id user_port_create(int32 queue_length, const char *uname)
{
dprintf("user_port_create: queue_length %d\n", queue_length);
if(uname != NULL) {
char name[SYS_MAX_OS_NAME_LEN];
int rc;
if(is_kernel_address(uname))
return ERR_VM_BAD_USER_MEMORY;
rc = user_strncpy(name, uname, SYS_MAX_OS_NAME_LEN-1);
if(rc < 0)
return rc;
name[SYS_MAX_OS_NAME_LEN-1] = 0;
return port_create(queue_length, name);
} else {
return port_create(queue_length, NULL);
}
}
static void dump_port_info(int argc, char **argv)
{
int i;
if(argc < 2) {
dprintf("port: not enough arguments\n");
return;
}
// if the argument looks like a hex number, treat it as such
if(strlen(argv[1]) > 2 && argv[1][0] == '0' && argv[1][1] == 'x') {
unsigned long num = atoul(argv[1]);
if(is_kernel_address(num)) {
// XXX semi-hack
// one can use either address or a port_id, since KERNEL_BASE > MAX_PORTS assumed
_dump_port_info((struct port_entry *)num);
return;
} else {
unsigned slot = num % MAX_PORTS;
if(ports[slot].id != (int)num) {
dprintf("port 0x%lx doesn't exist!\n", num);
return;
}
_dump_port_info(&ports[slot]);
return;
}
}
// walk through the ports list, trying to match name
for(i=0; i<MAX_PORTS; i++) {
if (ports[i].name != NULL)
if(strcmp(argv[1], ports[i].name) == 0) {
_dump_port_info(&ports[i]);
return;
}
}
}
/* software page fault handler */
static status_t vm_soft_page_fault(addr_t addr, bool is_write, bool is_exec, bool is_user)
{
vm_address_space_t *aspace;
vm_mapping_t *mapping;
vm_upage_t *upage;
vm_page_t *page;
unsigned long irqstate;
status_t err;
/* get faulted address space */
if(is_kernel_address(addr)) {
aspace = vm_get_kernel_aspace();
} else {
aspace = vm_get_current_user_aspace();
if(!aspace)
panic("vm_soft_page_fault: no user address space!\n");
}
/* increment address space faults counter */
atomic_inc((atomic_t*)&aspace->faults_count);
/** TODO: spinlocks are temporary solution here. **/
/* acquire lock before touching address space */
irqstate = spin_lock_irqsave(&aspace->lock);
/* get faulted mapping */
err = vm_aspace_get_mapping(aspace, addr, &mapping);
if(err != NO_ERROR)
panic("vm_soft_page_fault: can't get mapping at address %x, err = %x!\n", addr, err);
/* this page fault handler deals only with mapped objects */
if(mapping->type != VM_MAPPING_TYPE_OBJECT)
panic("vm_soft_page_fault: wrong mapping type!\n");
/* lock mapped object */
spin_lock(&mapping->object->lock);
/* get universal page for mapping its data */
err = vm_object_get_or_add_upage(mapping->object,
addr - mapping->start + mapping->offset,
&upage);
if(err != NO_ERROR)
panic("vm_soft_page_fault: can't get upage, err = %x!\n", err);
/* allocate new physical page or just map existing page */
if(upage->state == VM_UPAGE_STATE_UNWIRED) {
/* upage is not wired with physical page.
* so... allocate new one.
*/
page = vm_page_alloc(VM_PAGE_STATE_CLEAR);
if(page == NULL)
panic("vm_soft_page_fault: out of physical memory!\n");
/* stick physical page into upage */
upage->state = VM_UPAGE_STATE_RESIDENT;
upage->ppn = page->ppn;
} else if(upage->state == VM_UPAGE_STATE_RESIDENT) {
/* upage has resident physical page.
* just get it for further mapping.
*/
page = vm_page_lookup(upage->ppn);
if(page == NULL)
panic("vm_soft_page_fault: wrong physical page number!\n");
} else {
/* all other upage states is not supported for now */
panic("vm_soft_page_fault: invalid universal page state!\n");
page = NULL; /* keep compiler happy */
}
/* now unlock object */
spin_unlock(&mapping->object->lock);
/* ... and lock translation map */
aspace->tmap.ops->lock(&aspace->tmap);
/* map page into address space */
aspace->tmap.ops->map(&aspace->tmap, addr, PAGE_ADDRESS(page->ppn), mapping->protect);
/* unlock translation map */
aspace->tmap.ops->unlock(&aspace->tmap);
/* .. and finally unlock address space */
spin_unlock_irqrstor(&aspace->lock, irqstate);
/* return address space to the kernel */
vm_put_aspace(aspace);
/* page fault handled successfully */
return NO_ERROR;
}