source: mainline/uspace/lib/libc/generic/ddi.c@ e2b9a993

/*
 * Copyright (c) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup libc
 * @{
 */
/** @file
 */ 

#include <ddi.h>
#include <libarch/ddi.h>
#include <libc.h>
#include <task.h>
#include <as.h>
#include <align.h>
#include <libarch/config.h>
#include <kernel/ddi/ddi_arg.h>

/** Return unique device number.
 *
 * @return New unique device number.
 *
 */
int device_assign_devno(void)
{
        return __SYSCALL0(SYS_DEVICE_ASSIGN_DEVNO);
}

/** Map piece of physical memory to task.
 *
 * Caller of this function must have the CAP_MEM_MANAGER capability.
 *
 * @param pf            Physical address of the starting frame.
 * @param vp            Virtual address of the starting page.
 * @param pages         Number of pages to map.
 * @param flags         Flags for the new address space area.
 *
 * @return              0 on success, EPERM if the caller lacks the
 *                      CAP_MEM_MANAGER capability, ENOENT if there is no task
 *                      with specified ID and ENOMEM if there was some problem
 *                      in creating address space area.
 */
int physmem_map(void *pf, void *vp, unsigned long pages, int flags)
{
        return __SYSCALL4(SYS_PHYSMEM_MAP, (sysarg_t) pf, (sysarg_t) vp, pages,
            flags);
}

/** Enable I/O space range to task.
 *
 * Caller of this function must have the IO_MEM_MANAGER capability.
 *
 * @param id            Task ID.
 * @param ioaddr        Starting address of the I/O range.
 * @param size          Size of the range.
 *
 * @return              0 on success, EPERM if the caller lacks the
 *                      CAP_IO_MANAGER capability, ENOENT if there is no task
 *                      with specified ID and ENOMEM if there was some problem
 *                      in allocating memory.
 */
int iospace_enable(task_id_t id, void *ioaddr, unsigned long size)
{
        ddi_ioarg_t arg;

        arg.task_id = id;
        arg.ioaddr = ioaddr;
        arg.size = size;

        return __SYSCALL1(SYS_IOSPACE_ENABLE, (sysarg_t) &arg);
}

/** Interrupt control
 *
 * @param enable        1 - enable interrupts, 0 - disable interrupts
 */
int preemption_control(int enable)
{
        return __SYSCALL1(SYS_PREEMPT_CONTROL, (sysarg_t) enable);
}

/** Enable PIO for specified I/O range.
 *
 * @param pio_addr      I/O start address.
 * @param size          Size of the I/O region.
 * @param use_addr      Address where the final address for application's PIO
 *                      will be stored.
 *
 * @return              Zero on success or negative error code.
 */
int pio_enable(void *pio_addr, size_t size, void **use_addr)
{
        void *phys;
        void *virt;
        size_t offset;
        unsigned int pages;

#ifdef IO_SPACE_BOUNDARY
        if (pio_addr < IO_SPACE_BOUNDARY) {
                *use_addr = pio_addr;
                return iospace_enable(task_get_id(), pio_addr, size);
        }
#endif

        phys = (void *) ALIGN_DOWN((uintptr_t) pio_addr, PAGE_SIZE);
        offset = pio_addr - phys;
        pages = ALIGN_UP(offset + size, PAGE_SIZE) >> PAGE_WIDTH;
        virt = as_get_mappable_page(pages << PAGE_WIDTH);
        *use_addr = virt + offset;
        return physmem_map(phys, virt, pages, AS_AREA_READ | AS_AREA_WRITE);
}

/** @}
 */