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); |
} |