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1180 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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 */
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/** @addtogroup libc
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 * @{
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 */
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/** @file
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 */
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#include <ddi.h>
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#include <libarch/ddi.h>
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#include <libc.h>
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#include <task.h>
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#include <as.h>
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#include <align.h>
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#include <libarch/config.h>
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#include <kernel/ddi/ddi_arg.h>
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/** Return unique device number.
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 *
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 * @return New unique device number.
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 *
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 */
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int device_assign_devno(void)
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{
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    return __SYSCALL0(SYS_DEVICE_ASSIGN_DEVNO);
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}
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/** Map piece of physical memory to task.
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 *
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 * Caller of this function must have the CAP_MEM_MANAGER capability.
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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     Flags for the new address space area.
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 *
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 * @return      0 on success, EPERM if the caller lacks the
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 *          CAP_MEM_MANAGER capability, ENOENT if there is no task
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 *          with specified ID and ENOMEM if there was some problem
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 *          in creating address space area.
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 */
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int physmem_map(void *pf, void *vp, unsigned long pages, int flags)
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{
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    return __SYSCALL4(SYS_PHYSMEM_MAP, (sysarg_t) pf, (sysarg_t) vp, pages,
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        flags);
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}
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/** Enable I/O space range to task.
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 *
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 * Caller of this function must have the IO_MEM_MANAGER capability.
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 *
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 * @param id        Task ID.
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 * @param ioaddr    Starting address of the I/O range.
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 * @param size      Size of the range.
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 *
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 * @return      0 on success, EPERM if the caller lacks the
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 *          CAP_IO_MANAGER capability, ENOENT if there is no task
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 *          with specified ID and ENOMEM if there was some problem
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 *          in allocating memory.
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 */
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int iospace_enable(task_id_t id, void *ioaddr, unsigned long size)
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{
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    ddi_ioarg_t arg;
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    arg.task_id = id;
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    arg.ioaddr = ioaddr;
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    arg.size = size;
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    return __SYSCALL1(SYS_IOSPACE_ENABLE, (sysarg_t) &arg);
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}
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/** Interrupt control
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 *
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 * @param enable    1 - enable interrupts, 0 - disable interrupts
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 */
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int preemption_control(int enable)
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{
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    return __SYSCALL1(SYS_PREEMPT_CONTROL, (sysarg_t) enable);
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}
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/** Enable PIO for specified I/O range.
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 *
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 * @param pio_addr  I/O start address.
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 * @param size      Size of the I/O region.
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 * @param use_addr  Address where the final address for application's PIO
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 *          will be stored.
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 *
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 * @return      Zero on success or negative error code.
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 */
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int pio_enable(void *pio_addr, size_t size, void **use_addr)
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{
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    void *phys;
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    void *virt;
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    size_t offset;
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    unsigned int pages;
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#ifdef IO_SPACE_BOUNDARY
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    if (pio_addr < IO_SPACE_BOUNDARY) {
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        *use_addr = pio_addr;
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        return iospace_enable(task_get_id(), pio_addr, size);
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    }
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#endif
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    phys = (void *) ALIGN_DOWN((uintptr_t) pio_addr, PAGE_SIZE);
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    offset = pio_addr - phys;
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    pages = ALIGN_UP(offset + size, PAGE_SIZE) >> PAGE_WIDTH;
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    virt = as_get_mappable_page(pages << PAGE_WIDTH);
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    *use_addr = virt + offset;
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    return physmem_map(phys, virt, pages, AS_AREA_READ | AS_AREA_WRITE);
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}
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/** @}
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 */