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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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 */
1248 jermar 28 
 
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/**
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 * @file    ddi.c
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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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 */
1178 jermar 37 
 
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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>
1288 jermar 45 
#include <syscall/copy.h>
1178 jermar 46 
#include <arch.h>
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#include <align.h>
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#include <errno.h>
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1494 palkovsky 50 
/** Map piece of physical memory into virtual address space of current task.
1178 jermar 51 
 *
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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.
1429 jermar 55 
 * @param flags Address space area flags for the mapping.
1178 jermar 56 
 *
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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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 */
1494 palkovsky 61 
static int ddi_physmem_map(__address pf, __address vp, count_t pages, int flags)
1178 jermar 62 
{
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    ipl_t ipl;
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    cap_t caps;
1425 jermar 65 
    mem_backend_data_t backend_data;
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    backend_data.base = pf;
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    backend_data.frames = pages;
1178 jermar 69 
 
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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;
1494 palkovsky 76 
 
1178 jermar 77 
    ipl = interrupts_disable();
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    /* Lock the task and release the lock protecting tasks_btree. */
1494 palkovsky 79 
    spinlock_lock(&TASK->lock);
1178 jermar 80 
 
1494 palkovsky 81 
    if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
1424 jermar 82 
        &phys_backend, &backend_data)) {
1178 jermar 83 
        /*
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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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         */
1494 palkovsky 87 
        spinlock_unlock(&TASK->lock);
1178 jermar 88 
        interrupts_restore(ipl);
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        return ENOMEM;
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    }
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1424 jermar 92 
    /*
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     * Mapping is created on-demand during page fault.
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     */
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1494 palkovsky 96 
    spinlock_unlock(&TASK->lock);
1178 jermar 97 
    interrupts_restore(ipl);
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    return 0;
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}
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1191 jermar 101 
/** 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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 */
1227 jermar 110 
static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size)
1191 jermar 111 
{
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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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    /* 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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1227 jermar 142 
    rc = ddi_iospace_enable_arch(t, ioaddr, size);
1191 jermar 143 
 
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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 149 
/** Wrapper for SYS_MAP_PHYSMEM syscall.
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 *
1494 palkovsky 151 
 * @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
1178 jermar 155 
 *
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 * @return 0 on success, otherwise it returns error code found in errno.h
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 */
1494 palkovsky 158 
__native sys_physmem_map(__native phys_base, __native virt_base, __native pages,
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             __native flags)
1178 jermar 160 
{
1494 palkovsky 161 
    return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE),
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                      ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages,
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                      (int) flags);
1178 jermar 164 
}
1191 jermar 165 
 
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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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 */
1227 jermar 172 
__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
1191 jermar 173 
{
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    ddi_ioarg_t arg;
1288 jermar 175 
    int rc;
1191 jermar 176 
 
1288 jermar 177 
    rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
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    if (rc != 0)
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        return (__native) rc;
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1227 jermar 181 
    return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);
1191 jermar 182 
}
1297 jermar 183 
 
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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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 */
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__native sys_preempt_control(int enable)
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{
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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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}