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1178 jermar 1
/*
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 * Copyright (C) 2006 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <ddi/ddi.h>
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#include <ddi/ddi_arg.h>
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#include <proc/task.h>
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#include <security/cap.h>
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#include <mm/frame.h>
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#include <mm/page.h>
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#include <mm/as.h>
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#include <synch/spinlock.h>
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#include <arch.h>
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#include <align.h>
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#include <errno.h>
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/** Map piece of physical memory into virtual address space of specified task.
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 *
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 * @param id Task ID of the destination task.
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 * @param pf Physical frame address of the starting frame.
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 * @param vp Virtual page address of the starting page.
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 * @param pages Number of pages to map.
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 * @param writable If true, the mapping will be created writable.
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 *
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 * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
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 *	   ENOENT if there is no task matching the specified ID and ENOMEM if
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 *	   there was a problem in creating address space area.
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 */
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static int ddi_map_physmem(task_id_t id, __address pf, __address vp, count_t pages, bool writable)
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{
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	ipl_t ipl;
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	cap_t caps;
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	task_t *t;
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	int flags;
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	count_t i;
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	/*
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	 * Make sure the caller is authorised to make this syscall.
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	 */
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	caps = cap_get(TASK);
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	if (!(caps & CAP_MEM_MANAGER))
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		return EPERM;
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	ipl = interrupts_disable();
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	spinlock_lock(&tasks_lock);
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	t = task_find_by_id(id);
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	if (!t) {
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		/*
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		 * There is no task with the specified ID.
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		 */
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		spinlock_unlock(&tasks_lock);
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		interrupts_restore(ipl);
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		return ENOENT;
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	}
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	/*
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	 * TODO: We are currently lacking support for task destroying.
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	 * Once it is added to the kernel, we must take care to
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	 * synchronize in a way that prevents race conditions here.
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	 */
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	/* Lock the task and release the lock protecting tasks_btree. */
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	spinlock_lock(&t->lock);
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	spinlock_unlock(&tasks_lock);
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	flags = AS_AREA_DEVICE | AS_AREA_READ;
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	if (writable)
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		flags |= AS_AREA_WRITE;
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	if (!as_area_create(t->as, flags, pages * PAGE_SIZE, vp)) {
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		/*
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		 * The address space area could not have been created.
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		 * We report it using ENOMEM.
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		 */
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		spinlock_unlock(&t->lock);
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		interrupts_restore(ipl);
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		return ENOMEM;
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	}
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	/* Initialize page tables. */
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	for (i = 0; i < pages; i++)
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		as_set_mapping(t->as, vp + i * PAGE_SIZE, pf + i * FRAME_SIZE);
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	spinlock_unlock(&t->lock);
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	interrupts_restore(ipl);
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	return 0;
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}
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1191 jermar 114
/** Enable range of I/O space for task.
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 *
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 * @param id Task ID of the destination task.
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 * @param ioaddr Starting I/O address.
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 * @param size Size of the enabled I/O space..
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 *
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 * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
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 *	   ENOENT if there is no task matching the specified ID.
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 */
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static int ddi_enable_iospace(task_id_t id, __address ioaddr, size_t size)
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{
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	ipl_t ipl;
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	cap_t caps;
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	task_t *t;
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	int rc;
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	/*
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	 * Make sure the caller is authorised to make this syscall.
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	 */
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	caps = cap_get(TASK);
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	if (!(caps & CAP_IO_MANAGER))
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		return EPERM;
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	ipl = interrupts_disable();
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	spinlock_lock(&tasks_lock);
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	t = task_find_by_id(id);
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	if (!t) {
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		/*
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		 * There is no task with the specified ID.
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		 */
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		spinlock_unlock(&tasks_lock);
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		interrupts_restore(ipl);
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		return ENOENT;
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	}
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	/*
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	 * TODO: We are currently lacking support for task destroying.
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	 * Once it is added to the kernel, we must take care to
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	 * synchronize in a way that prevents race conditions here.
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	 */
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	/* Lock the task and release the lock protecting tasks_btree. */
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	spinlock_lock(&t->lock);
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	spinlock_unlock(&tasks_lock);
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	rc = ddi_enable_iospace_arch(t, ioaddr, size);
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	spinlock_unlock(&t->lock);
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	interrupts_restore(ipl);
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	return rc;
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}
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1178 jermar 168
/** Wrapper for SYS_MAP_PHYSMEM syscall.
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 *
1191 jermar 170
 * @param User space address of memory DDI argument structure.
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 *
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 * @return 0 on success, otherwise it returns error code found in errno.h
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 */ 
1191 jermar 174
__native sys_map_physmem(ddi_memarg_t *uspace_mem_arg)
1178 jermar 175
{
1191 jermar 176
	ddi_memarg_t arg;
1178 jermar 177
 
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	copy_from_uspace(&arg, uspace_mem_arg, sizeof(ddi_memarg_t));
1178 jermar 179
	return (__native) ddi_map_physmem((task_id_t) arg.task_id, ALIGN_DOWN((__address) arg.phys_base, FRAME_SIZE),
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					  ALIGN_DOWN((__address) arg.virt_base, PAGE_SIZE), (count_t) arg.pages,
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					  (bool) arg.writable);
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}
1191 jermar 183
 
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/** Wrapper for SYS_ENABLE_IOSPACE syscall.
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 *
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 * @param User space address of DDI argument structure.
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 *
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 * @return 0 on success, otherwise it returns error code found in errno.h
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 */ 
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__native sys_enable_iospace(ddi_ioarg_t *uspace_io_arg)
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{
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	ddi_ioarg_t arg;
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	copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
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	return (__native) ddi_enable_iospace((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);
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}