source: mainline/uspace/lib/c/generic/ddi.c@ d0c9b4b

/*
 * 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 <assert.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <abi/ddi/arg.h>
#include <ddi.h>
#include <libarch/ddi.h>
#include <libc.h>
#include <task.h>
#include <as.h>
#include <align.h>
#include <libarch/config.h>
#include "private/libc.h"

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

/** Map a piece of physical memory to task.
 *
 * Caller of this function must have the CAP_MEM_MANAGER capability.
 *
 * @param phys  Physical address of the starting frame.
 * @param pages Number of pages to map.
 * @param flags Flags for the new address space area.
 * @param virt  Virtual address of the starting page.
 *
 * @return EOK on success
 * @return EPERM if the caller lacks the CAP_MEM_MANAGER capability
 * @return ENOENT if there is no task with specified ID
 * @return ENOMEM if there was some problem in creating
 *         the address space area.
 *
 */
int physmem_map(void *phys, size_t pages, unsigned int flags, void **virt)
{
        return __SYSCALL5(SYS_PHYSMEM_MAP, (sysarg_t) phys,
            pages, flags, (sysarg_t) virt, (sysarg_t) __entry);
}

int dmamem_map(void *virt, size_t size, unsigned int map_flags,
    unsigned int flags, void **phys)
{
        return (int) __SYSCALL6(SYS_DMAMEM_MAP, (sysarg_t) size,
            (sysarg_t) map_flags, (sysarg_t) flags & ~DMAMEM_FLAGS_ANONYMOUS,
            (sysarg_t) phys, (sysarg_t) virt, 0);
}

int dmamem_map_anonymous(size_t size, unsigned int map_flags,
    unsigned int flags, void **phys, void **virt)
{
        return (int) __SYSCALL6(SYS_DMAMEM_MAP, (sysarg_t) size,
            (sysarg_t) map_flags, (sysarg_t) flags | DMAMEM_FLAGS_ANONYMOUS,
            (sysarg_t) phys, (sysarg_t) virt, (sysarg_t) __entry);
}

int dmamem_unmap(void *virt, size_t size)
{
        return __SYSCALL3(SYS_DMAMEM_UNMAP, (sysarg_t) virt, (sysarg_t) size, 0);
}

int dmamem_unmap_anonymous(void *virt)
{
        return __SYSCALL3(SYS_DMAMEM_UNMAP, (sysarg_t) virt, 0,
            DMAMEM_FLAGS_ANONYMOUS);
}

/** 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 EOK on success
 * @return EPERM if the caller lacks the CAP_IO_MANAGER capability
 * @return ENOENT if there is no task with specified ID
 * @return 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);
}

/** Enable PIO for specified I/O range.
 *
 * @param pio_addr I/O start address.
 * @param size     Size of the I/O region.
 * @param virt     Virtual address for application's
 *                 PIO operations.
 *
 * @return EOK on success.
 * @return Negative error code on failure.
 *
 */
int pio_enable(void *pio_addr, size_t size, void **virt)
{
#ifdef IO_SPACE_BOUNDARY
        if (pio_addr < IO_SPACE_BOUNDARY) {
                *virt = pio_addr;
                return iospace_enable(task_get_id(), pio_addr, size);
        }
#endif
        
        void *phys_frame =
            (void *) ALIGN_DOWN((uintptr_t) pio_addr, PAGE_SIZE);
        size_t offset = pio_addr - phys_frame;
        size_t pages = SIZE2PAGES(offset + size);
        
        void *virt_page;
        int rc = physmem_map(phys_frame, pages,
            AS_AREA_READ | AS_AREA_WRITE, &virt_page);
        if (rc != EOK)
                return rc;
        
        *virt = virt_page + offset;
        return EOK;
}

/** Register IRQ notification.
 *
 * @param inr    IRQ number.
 * @param devno  Device number of the device generating inr.
 * @param method Use this method for notifying me.
 * @param ucode  Top-half pseudocode handler.
 *
 * @return Value returned by the kernel.
 *
 */
int irq_register(int inr, int devno, int method, irq_code_t *ucode)
{
        return __SYSCALL4(SYS_IRQ_REGISTER, inr, devno, method,
            (sysarg_t) ucode);
}

/** Unregister IRQ notification.
 *
 * @param inr   IRQ number.
 * @param devno Device number of the device generating inr.
 *
 * @return Value returned by the kernel.
 *
 */
int irq_unregister(int inr, int devno)
{
        return __SYSCALL2(SYS_IRQ_UNREGISTER, inr, devno);
}

/** @}
 */