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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/list.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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/** List with enabled physical memory areas. */
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static LIST_INITIALIZE(parea_head);
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/** Initialize DDI. */
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void ddi_init(void)
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{
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    hw_area();
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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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81
    /*
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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.
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     */
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    link_initialize(&parea->link);
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    list_append(&parea->link, &parea_head);
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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, pfn_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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113
    /*
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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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1178 jermar 120
    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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     */
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    spinlock_lock(&parea_lock);
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127
    bool fnd = false;
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    link_t *cur;
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130
    for (cur = parea_head.next; cur != &parea_head; cur = cur->next) {
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        parea_t *parea = list_get_instance(cur, parea_t, link);
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        if ((parea->pbase <= pf) && (ADDR2PFN(pf - parea->pbase) + pages <= parea->frames)) {
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            fnd = true;
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            break;
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        }
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    }
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138
    spinlock_unlock(&parea_lock);
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140
    if (!fnd) {
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        /*
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         * Physical memory area cannot be mapped.
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         */
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        interrupts_restore(ipl);
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        return ENOENT;
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    }
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    spinlock_lock(&TASK->lock);
1178 jermar 149
 
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    if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
1424 jermar 151
        &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;
159
    }
160
 
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    /*
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     * Mapping is created on-demand during page fault.
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     */
164
 
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    spinlock_unlock(&TASK->lock);
1178 jermar 166
    interrupts_restore(ipl);
167
    return 0;
168
}
169
 
1191 jermar 170
/** 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 178
 */
1780 jermar 179
static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size)
1191 jermar 180
{
181
    ipl_t ipl;
182
    cap_t caps;
183
    task_t *t;
184
    int rc;
185
 
186
    /*
187
     * Make sure the caller is authorised to make this syscall.
188
     */
189
    caps = cap_get(TASK);
190
    if (!(caps & CAP_IO_MANAGER))
191
        return EPERM;
192
 
193
    ipl = interrupts_disable();
194
    spinlock_lock(&tasks_lock);
195
 
196
    t = task_find_by_id(id);
197
 
1839 decky 198
    if ((!t) || (!context_check(CONTEXT, t->context))) {
1191 jermar 199
        /*
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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;
207
    }
208
 
209
    /* Lock the task and release the lock protecting tasks_btree. */
210
    spinlock_lock(&t->lock);
211
    spinlock_unlock(&tasks_lock);
212
 
1227 jermar 213
    rc = ddi_iospace_enable_arch(t, ioaddr, size);
1191 jermar 214
 
215
    spinlock_unlock(&t->lock);
216
    interrupts_restore(ipl);
217
    return rc;
218
}
219
 
2012 jermar 220
/** Wrapper for SYS_PHYSMEM_MAP syscall.
1178 jermar 221
 *
1494 palkovsky 222
 * @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 226
 *
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 * @return 0 on success, otherwise it returns error code found in errno.h
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 */
2107 jermar 229
unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base,
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    unative_t pages, unative_t flags)
1178 jermar 231
{
2015 jermar 232
    return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base,
2107 jermar 233
        FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE),
3908 decky 234
        (pfn_t) pages, (int) flags);
1178 jermar 235
}
1191 jermar 236
 
237
/** Wrapper for SYS_ENABLE_IOSPACE syscall.
238
 *
1708 jermar 239
 * @param uspace_io_arg User space address of DDI argument structure.
1191 jermar 240
 *
241
 * @return 0 on success, otherwise it returns error code found in errno.h
242
 */
1780 jermar 243
unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
1191 jermar 244
{
245
    ddi_ioarg_t arg;
1288 jermar 246
    int rc;
1191 jermar 247
 
1288 jermar 248
    rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
249
    if (rc != 0)
1780 jermar 250
        return (unative_t) rc;
1288 jermar 251
 
2015 jermar 252
    return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id,
2107 jermar 253
        (uintptr_t) arg.ioaddr, (size_t) arg.size);
1191 jermar 254
}
1297 jermar 255
 
256
/** Disable or enable preemption.
257
 *
2015 jermar 258
 * @param enable If non-zero, the preemption counter will be decremented,
259
 *  leading to potential enabling of preemption. Otherwise the preemption
260
 *  counter will be incremented, preventing preemption from occurring.
1297 jermar 261
 *
262
 * @return Zero on success or EPERM if callers capabilities are not sufficient.
263
 */
1780 jermar 264
unative_t sys_preempt_control(int enable)
1297 jermar 265
{
3908 decky 266
    if (!cap_get(TASK) & CAP_PREEMPT_CONTROL)
267
        return EPERM;
268
    if (enable)
269
        preemption_enable();
270
    else
271
        preemption_disable();
272
    return 0;
1297 jermar 273
}
1702 cejka 274
 
1888 jermar 275
/** @}
1702 cejka 276
 */