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1178 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2006 Jakub Jermar
1178 jermar 3
 * 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 <adt/btree.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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/** This lock protects the parea_btree. */
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SPINLOCK_INITIALIZE(parea_lock);
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/** B+tree with enabled physical memory areas. */
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static btree_t parea_btree;
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/** Initialize DDI. */
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void ddi_init(void)
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{
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    btree_create(&parea_btree);
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}
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/** Enable piece of physical memory for mapping by physmem_map().
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 *
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 * @param parea Pointer to physical area structure.
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 *
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 * @todo This function doesn't check for overlaps. It depends on the kernel to
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 * create disjunct physical memory areas.
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 */
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void ddi_parea_register(parea_t *parea)
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{
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    ipl_t ipl;
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    ipl = interrupts_disable();
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    spinlock_lock(&parea_lock);
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    /*
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     * TODO: we should really check for overlaps here.
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     * However, we should be safe because the kernel is pretty sane and
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     * memory of different devices doesn't overlap.
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     */
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    btree_insert(&parea_btree, (btree_key_t) parea->pbase, parea, NULL);
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    spinlock_unlock(&parea_lock);
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    interrupts_restore(ipl);   
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}
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/** Map piece of physical memory into virtual address space of current task.
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 *
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 * @param pf Physical address of the starting frame.
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 * @param vp Virtual 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
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 *  syscall, ENOENT if there is no task matching the specified ID or the
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 *  physical address space is not enabled for mapping and ENOMEM if there
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 *  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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    /*
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     * Check if the physical memory area is enabled for mapping.
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     * If the architecture supports virtually indexed caches, intercept
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     * attempts to create an illegal address alias.
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     */
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    spinlock_lock(&parea_lock);
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    parea_t *parea;
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    btree_node_t *nodep;
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    parea = (parea_t *) btree_search(&parea_btree, (btree_key_t) pf, &nodep);
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    if (!parea || parea->frames < pages || ((flags & AS_AREA_CACHEABLE) &&
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        !parea->cacheable) || (!(flags & AS_AREA_CACHEABLE) &&
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        parea->cacheable)) {
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        /*
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         * This physical memory area cannot be mapped.
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         */
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        spinlock_unlock(&parea_lock);
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        interrupts_restore(ipl);
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        return ENOENT;
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    }
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    spinlock_unlock(&parea_lock);
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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
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 *  syscall, ENOENT if there is no task matching the specified ID.
1191 jermar 173
 */
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static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size)
1191 jermar 175
{
176
    ipl_t ipl;
177
    cap_t caps;
178
    task_t *t;
179
    int rc;
180
 
181
    /*
182
     * Make sure the caller is authorised to make this syscall.
183
     */
184
    caps = cap_get(TASK);
185
    if (!(caps & CAP_IO_MANAGER))
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        return EPERM;
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188
    ipl = interrupts_disable();
189
    spinlock_lock(&tasks_lock);
190
 
191
    t = task_find_by_id(id);
192
 
1839 decky 193
    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);
207
 
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    rc = ddi_iospace_enable_arch(t, ioaddr, size);
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210
    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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2012 jermar 215
/** Wrapper for SYS_PHYSMEM_MAP syscall.
1178 jermar 216
 *
1494 palkovsky 217
 * @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,
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    unative_t pages, unative_t flags)
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{
2015 jermar 227
    return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base,
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        FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE),
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        (count_t) pages, (int) flags);
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}
1191 jermar 231
 
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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
237
 */
1780 jermar 238
unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
1191 jermar 239
{
240
    ddi_ioarg_t arg;
1288 jermar 241
    int rc;
1191 jermar 242
 
1288 jermar 243
    rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
244
    if (rc != 0)
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        return (unative_t) rc;
1288 jermar 246
 
2015 jermar 247
    return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id,
2107 jermar 248
        (uintptr_t) arg.ioaddr, (size_t) arg.size);
1191 jermar 249
}
1297 jermar 250
 
251
/** Disable or enable preemption.
252
 *
2015 jermar 253
 * @param enable If non-zero, the preemption counter will be decremented,
254
 *  leading to potential enabling of preemption. Otherwise the preemption
255
 *  counter will be incremented, preventing preemption from occurring.
1297 jermar 256
 *
257
 * @return Zero on success or EPERM if callers capabilities are not sufficient.
258
 */
1780 jermar 259
unative_t sys_preempt_control(int enable)
1297 jermar 260
{
2107 jermar 261
        if (!cap_get(TASK) & CAP_PREEMPT_CONTROL)
1297 jermar 262
                return EPERM;
263
        if (enable)
264
                preemption_enable();
265
        else
266
                preemption_disable();
267
        return 0;
268
}
1702 cejka 269
 
1888 jermar 270
/** @}
1702 cejka 271
 */