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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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/** @addtogroup genericddi
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 * @{
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 */
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/**
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 * @file
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 * @brief   Device Driver Interface functions.
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 *
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 * This file contains functions that comprise the Device Driver Interface.
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 * These are the functions for mapping physical memory and enabling I/O
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 * space to tasks.
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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/as.h>
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#include <synch/spinlock.h>
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#include <syscall/copy.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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1494 palkovsky 54
/** Map piece of physical memory into virtual address space of current task.
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 *
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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 flags Address space area flags for the mapping.
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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_physmem_map(uintptr_t pf, uintptr_t vp, count_t pages, int flags)
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{
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    ipl_t ipl;
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    cap_t caps;
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    mem_backend_data_t backend_data;
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    backend_data.base = pf;
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    backend_data.frames = pages;
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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(&TASK->lock);
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    if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
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        &phys_backend, &backend_data)) {
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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(&TASK->lock);
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        interrupts_restore(ipl);
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        return ENOMEM;
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    }
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    /*
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     * Mapping is created on-demand during page fault.
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     */
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    spinlock_unlock(&TASK->lock);
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    interrupts_restore(ipl);
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    return 0;
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}
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/** 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_iospace_enable(task_id_t id, uintptr_t 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) || (!context_check(CONTEXT, t->context))) {
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        /*
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         * There is no task with the specified ID
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         * or the task belongs to a different security
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         * context.
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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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    /* 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_iospace_enable_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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/** Wrapper for SYS_MAP_PHYSMEM syscall.
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 *
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 * @param phys_base Physical base address to map
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 * @param virt_base Destination virtual address
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 * @param pages Number of pages
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 * @param flags Flags of newly mapped pages
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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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unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base, unative_t pages,
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             unative_t flags)
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{
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    return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base, FRAME_SIZE),
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                      ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE), (count_t) pages,
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                      (int) flags);
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}
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/** Wrapper for SYS_ENABLE_IOSPACE syscall.
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 *
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 * @param uspace_io_arg 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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 */
1780 jermar 177
unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
1191 jermar 178
{
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    ddi_ioarg_t arg;
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    int rc;
1191 jermar 181
 
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    rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
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    if (rc != 0)
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        return (unative_t) rc;
1288 jermar 185
 
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    return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id, (uintptr_t) arg.ioaddr, (size_t) arg.size);
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}
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/** Disable or enable preemption.
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 *
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 * @param enable If non-zero, the preemption counter will be decremented, leading to potential
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 *       enabling of preemption. Otherwise the preemption counter will be incremented,
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 *       preventing preemption from occurring.
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 *
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 * @return Zero on success or EPERM if callers capabilities are not sufficient.
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 */
1780 jermar 197
unative_t sys_preempt_control(int enable)
1297 jermar 198
{
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        if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)
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                return EPERM;
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        if (enable)
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                preemption_enable();
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        else
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                preemption_disable();
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        return 0;
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}
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/** @}
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 */