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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 <libc.h>
  37. #include <task.h>
  38. #include <as.h>
  39. #include <align.h>
  40. #include <libarch/config.h>
  41. #include <kernel/ddi/ddi_arg.h>
  42.  
  43. /** Map piece of physical memory to task.
  44.  *
  45.  * Caller of this function must have the CAP_MEM_MANAGER capability.
  46.  *
  47.  * @param pf        Physical address of the starting frame.
  48.  * @param vp        Virtual address of the starting page.
  49.  * @param pages     Number of pages to map.
  50.  * @param flags     Flags for the new address space area.
  51.  *
  52.  * @return      0 on success, EPERM if the caller lacks the
  53.  *          CAP_MEM_MANAGER capability, ENOENT if there is no task
  54.  *          with specified ID and ENOMEM if there was some problem
  55.  *          in creating address space area.
  56.  */
  57. int physmem_map(void *pf, void *vp, unsigned long pages, int flags)
  58. {
  59.     return __SYSCALL4(SYS_PHYSMEM_MAP, (sysarg_t) pf, (sysarg_t) vp, pages,
  60.         flags);
  61. }
  62.  
  63. /** Enable I/O space range to task.
  64.  *
  65.  * Caller of this function must have the IO_MEM_MANAGER capability.
  66.  *
  67.  * @param id        Task ID.
  68.  * @param ioaddr    Starting address of the I/O range.
  69.  * @param size      Size of the range.
  70.  *
  71.  * @return      0 on success, EPERM if the caller lacks the
  72.  *          CAP_IO_MANAGER capability, ENOENT if there is no task
  73.  *          with specified ID and ENOMEM if there was some problem
  74.  *          in allocating memory.
  75.  */
  76. int iospace_enable(task_id_t id, void *ioaddr, unsigned long size)
  77. {
  78.     ddi_ioarg_t arg;
  79.  
  80.     arg.task_id = id;
  81.     arg.ioaddr = ioaddr;
  82.     arg.size = size;
  83.  
  84.     return __SYSCALL1(SYS_IOSPACE_ENABLE, (sysarg_t) &arg);
  85. }
  86.  
  87. /** Interrupt control
  88.  *
  89.  * @param enable    1 - enable interrupts, 0 - disable interrupts
  90.  */
  91. int preemption_control(int enable)
  92. {
  93.     return __SYSCALL1(SYS_PREEMPT_CONTROL, (sysarg_t) enable);
  94. }
  95.  
  96. /** Enable PIO for specified I/O range.
  97.  *
  98.  * @param pio_addr  I/O start address.
  99.  * @param size      Size of the I/O region.
  100.  * @param use_addr  Address where the final address for application's PIO
  101.  *          will be stored.
  102.  *
  103.  * @return      Zero on success or negative error code.
  104.  */
  105. int pio_enable(void *pio_addr, size_t size, void **use_addr)
  106. {
  107.     void *phys;
  108.     void *virt;
  109.     size_t offset;
  110.     unsigned int pages;
  111.  
  112. #ifdef IO_SPACE_BOUNDARY
  113.     if (pio_addr < IO_SPACE_BOUNDARY) {
  114.         *use_addr = pio_addr;
  115.         return iospace_enable(task_get_id(), pio_addr, size);
  116.     }
  117. #endif
  118.  
  119.     phys = ALIGN_DOWN((uintptr_t) pio_addr, PAGE_SIZE);
  120.     offset = pio_addr - phys;
  121.     pages = ALIGN_UP(offset + size, PAGE_SIZE) >> PAGE_WIDTH;
  122.     virt = as_get_mappable_page(pages);
  123.     *use_addr = virt + offset;
  124.     return physmem_map(phys, virt, pages, AS_AREA_READ | AS_AREA_WRITE);
  125. }
  126.  
  127. /** @}
  128.  */
  129.