| 0,0 → 1,128 |
|---|
| /* |
| * Copyright (C) 2006 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <ddi/ddi.h> |
| #include <ddi/ddi_arg.h> |
| #include <proc/task.h> |
| #include <security/cap.h> |
| #include <mm/frame.h> |
| #include <mm/page.h> |
| #include <mm/as.h> |
| #include <synch/spinlock.h> |
| #include <arch.h> |
| #include <align.h> |
| #include <errno.h> |
| |
| /** Map piece of physical memory into virtual address space of specified task. |
| * |
| * @param id Task ID of the destination task. |
| * @param pf Physical frame address of the starting frame. |
| * @param vp Virtual page address of the starting page. |
| * @param pages Number of pages to map. |
| * @param writable If true, the mapping will be created writable. |
| * |
| * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
| * ENOENT if there is no task matching the specified ID and ENOMEM if |
| * there was a problem in creating address space area. |
| */ |
| static int ddi_map_physmem(task_id_t id, __address pf, __address vp, count_t pages, bool writable) |
| { |
| ipl_t ipl; |
| cap_t caps; |
| task_t *t; |
| int flags; |
| count_t i; |
| |
| /* |
| * Make sure the caller is authorised to make this syscall. |
| */ |
| caps = cap_get(TASK); |
| if (!(caps & CAP_MEM_MANAGER)) |
| return EPERM; |
| |
| ipl = interrupts_disable(); |
| spinlock_lock(&tasks_lock); |
| |
| t = task_find_by_id(id); |
| |
| if (!t) { |
| /* |
| * There is no task with the specified ID. |
| */ |
| spinlock_unlock(&tasks_lock); |
| interrupts_restore(ipl); |
| return ENOENT; |
| } |
| |
| /* |
| * TODO: We are currently lacking support for task destroying. |
| * Once it is added to the kernel, we must take care to |
| * synchronize in a way that prevents race conditions here. |
| */ |
| |
| /* Lock the task and release the lock protecting tasks_btree. */ |
| spinlock_lock(&t->lock); |
| spinlock_unlock(&tasks_lock); |
| |
| flags = AS_AREA_DEVICE | AS_AREA_READ; |
| if (writable) |
| flags |= AS_AREA_WRITE; |
| if (!as_area_create(t->as, flags, pages * PAGE_SIZE, vp)) { |
| /* |
| * The address space area could not have been created. |
| * We report it using ENOMEM. |
| */ |
| spinlock_unlock(&t->lock); |
| interrupts_restore(ipl); |
| return ENOMEM; |
| } |
| |
| /* Initialize page tables. */ |
| for (i = 0; i < pages; i++) |
| as_set_mapping(t->as, vp + i * PAGE_SIZE, pf + i * FRAME_SIZE); |
| |
| spinlock_unlock(&t->lock); |
| interrupts_restore(ipl); |
| return 0; |
| } |
| |
| /** Wrapper for SYS_MAP_PHYSMEM syscall. |
| * |
| * @param User space address of DDI argument structure. |
| * |
| * @return 0 on success, otherwise it returns error code found in errno.h |
| */ |
| __native sys_map_physmem(ddi_arg_t *uspace_ddi_arg) |
| { |
| ddi_arg_t arg; |
| |
| copy_from_uspace(&arg, uspace_ddi_arg, sizeof(ddi_arg_t)); |
| return (__native) ddi_map_physmem((task_id_t) arg.task_id, ALIGN_DOWN((__address) arg.phys_base, FRAME_SIZE), |
| ALIGN_DOWN((__address) arg.virt_base, PAGE_SIZE), (count_t) arg.pages, |
| (bool) arg.writable); |
| } |