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  1. /*
  2.  * Copyright (c) 2006 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup libc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <ddi.h>
  36. #include <libarch/ddi.h>
  37. #include <libc.h>
  38. #include <task.h>
  39. #include <as.h>
  40. #include <align.h>
  41. #include <libarch/config.h>
  42. #include <kernel/ddi/ddi_arg.h>
  43.  
  44. /** Return unique device number.
  45.  *
  46.  * @return New unique device number.
  47.  *
  48.  */
  49. int device_assign_devno(void)
  50. {
  51.     return __SYSCALL0(SYS_DEVICE_ASSIGN_DEVNO);
  52. }
  53.  
  54. /** Map piece of physical memory to task.
  55.  *
  56.  * Caller of this function must have the CAP_MEM_MANAGER capability.
  57.  *
  58.  * @param pf        Physical address of the starting frame.
  59.  * @param vp        Virtual address of the starting page.
  60.  * @param pages     Number of pages to map.
  61.  * @param flags     Flags for the new address space area.
  62.  *
  63.  * @return      0 on success, EPERM if the caller lacks the
  64.  *          CAP_MEM_MANAGER capability, ENOENT if there is no task
  65.  *          with specified ID and ENOMEM if there was some problem
  66.  *          in creating address space area.
  67.  */
  68. int physmem_map(void *pf, void *vp, unsigned long pages, int flags)
  69. {
  70.     return __SYSCALL4(SYS_PHYSMEM_MAP, (sysarg_t) pf, (sysarg_t) vp, pages,
  71.         flags);
  72. }
  73.  
  74. /** Enable I/O space range to task.
  75.  *
  76.  * Caller of this function must have the IO_MEM_MANAGER capability.
  77.  *
  78.  * @param id        Task ID.
  79.  * @param ioaddr    Starting address of the I/O range.
  80.  * @param size      Size of the range.
  81.  *
  82.  * @return      0 on success, EPERM if the caller lacks the
  83.  *          CAP_IO_MANAGER capability, ENOENT if there is no task
  84.  *          with specified ID and ENOMEM if there was some problem
  85.  *          in allocating memory.
  86.  */
  87. int iospace_enable(task_id_t id, void *ioaddr, unsigned long size)
  88. {
  89.     ddi_ioarg_t arg;
  90.  
  91.     arg.task_id = id;
  92.     arg.ioaddr = ioaddr;
  93.     arg.size = size;
  94.  
  95.     return __SYSCALL1(SYS_IOSPACE_ENABLE, (sysarg_t) &arg);
  96. }
  97.  
  98. /** Interrupt control
  99.  *
  100.  * @param enable    1 - enable interrupts, 0 - disable interrupts
  101.  */
  102. int preemption_control(int enable)
  103. {
  104.     return __SYSCALL1(SYS_PREEMPT_CONTROL, (sysarg_t) enable);
  105. }
  106.  
  107. /** Enable PIO for specified I/O range.
  108.  *
  109.  * @param pio_addr  I/O start address.
  110.  * @param size      Size of the I/O region.
  111.  * @param use_addr  Address where the final address for application's PIO
  112.  *          will be stored.
  113.  *
  114.  * @return      Zero on success or negative error code.
  115.  */
  116. int pio_enable(void *pio_addr, size_t size, void **use_addr)
  117. {
  118.     void *phys;
  119.     void *virt;
  120.     size_t offset;
  121.     unsigned int pages;
  122.  
  123. #ifdef IO_SPACE_BOUNDARY
  124.     if (pio_addr < IO_SPACE_BOUNDARY) {
  125.         *use_addr = pio_addr;
  126.         return iospace_enable(task_get_id(), pio_addr, size);
  127.     }
  128. #endif
  129.  
  130.     phys = (void *) ALIGN_DOWN((uintptr_t) pio_addr, PAGE_SIZE);
  131.     offset = pio_addr - phys;
  132.     pages = ALIGN_UP(offset + size, PAGE_SIZE) >> PAGE_WIDTH;
  133.     virt = as_get_mappable_page(pages << PAGE_WIDTH);
  134.     *use_addr = virt + offset;
  135.     return physmem_map(phys, virt, pages, AS_AREA_READ | AS_AREA_WRITE);
  136. }
  137.  
  138. /** @}
  139.  */
  140.