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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. /**
  30.  * @file    ddi.c
  31.  * @brief   Device Driver Interface functions.
  32.  *
  33.  * This file contains functions that comprise the Device Driver Interface.
  34.  * These are the functions for mapping physical memory and enabling I/O
  35.  * space to tasks.
  36.  */
  37.  
  38. #include <ddi/ddi.h>
  39. #include <ddi/ddi_arg.h>
  40. #include <proc/task.h>
  41. #include <security/cap.h>
  42. #include <mm/frame.h>
  43. #include <mm/as.h>
  44. #include <synch/spinlock.h>
  45. #include <syscall/copy.h>
  46. #include <arch.h>
  47. #include <align.h>
  48. #include <errno.h>
  49.  
  50. /** Map piece of physical memory into virtual address space of current task.
  51.  *
  52.  * @param pf Physical frame address of the starting frame.
  53.  * @param vp Virtual page address of the starting page.
  54.  * @param pages Number of pages to map.
  55.  * @param flags Address space area flags for the mapping.
  56.  *
  57.  * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
  58.  *     ENOENT if there is no task matching the specified ID and ENOMEM if
  59.  *     there was a problem in creating address space area.
  60.  */
  61. static int ddi_physmem_map(__address pf, __address vp, count_t pages, int flags)
  62. {
  63.     ipl_t ipl;
  64.     cap_t caps;
  65.     mem_backend_data_t backend_data;
  66.  
  67.     backend_data.base = pf;
  68.     backend_data.frames = pages;
  69.    
  70.     /*
  71.      * Make sure the caller is authorised to make this syscall.
  72.      */
  73.     caps = cap_get(TASK);
  74.     if (!(caps & CAP_MEM_MANAGER))
  75.         return EPERM;
  76.  
  77.     ipl = interrupts_disable();
  78.     spinlock_lock(&TASK->lock);
  79.    
  80.     if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
  81.         &phys_backend, &backend_data)) {
  82.         /*
  83.          * The address space area could not have been created.
  84.          * We report it using ENOMEM.
  85.          */
  86.         spinlock_unlock(&TASK->lock);
  87.         interrupts_restore(ipl);
  88.         return ENOMEM;
  89.     }
  90.    
  91.     /*
  92.      * Mapping is created on-demand during page fault.
  93.      */
  94.    
  95.     spinlock_unlock(&TASK->lock);
  96.     interrupts_restore(ipl);
  97.     return 0;
  98. }
  99.  
  100. /** Enable range of I/O space for task.
  101.  *
  102.  * @param id Task ID of the destination task.
  103.  * @param ioaddr Starting I/O address.
  104.  * @param size Size of the enabled I/O space..
  105.  *
  106.  * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
  107.  *     ENOENT if there is no task matching the specified ID.
  108.  */
  109. static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size)
  110. {
  111.     ipl_t ipl;
  112.     cap_t caps;
  113.     task_t *t;
  114.     int rc;
  115.    
  116.     /*
  117.      * Make sure the caller is authorised to make this syscall.
  118.      */
  119.     caps = cap_get(TASK);
  120.     if (!(caps & CAP_IO_MANAGER))
  121.         return EPERM;
  122.    
  123.     ipl = interrupts_disable();
  124.     spinlock_lock(&tasks_lock);
  125.    
  126.     t = task_find_by_id(id);
  127.    
  128.     if (!t) {
  129.         /*
  130.          * There is no task with the specified ID.
  131.          */
  132.         spinlock_unlock(&tasks_lock);
  133.         interrupts_restore(ipl);
  134.         return ENOENT;
  135.     }
  136.  
  137.     /* Lock the task and release the lock protecting tasks_btree. */
  138.     spinlock_lock(&t->lock);
  139.     spinlock_unlock(&tasks_lock);
  140.  
  141.     rc = ddi_iospace_enable_arch(t, ioaddr, size);
  142.    
  143.     spinlock_unlock(&t->lock);
  144.     interrupts_restore(ipl);
  145.     return rc;
  146. }
  147.  
  148. /** Wrapper for SYS_MAP_PHYSMEM syscall.
  149.  *
  150.  * @param phys_base Physical base address to map
  151.  * @param virt_base Destination virtual address
  152.  * @param pages Number of pages
  153.  * @param flags Flags of newly mapped pages
  154.  *
  155.  * @return 0 on success, otherwise it returns error code found in errno.h
  156.  */
  157. __native sys_physmem_map(__native phys_base, __native virt_base, __native pages,
  158.              __native flags)
  159. {
  160.     return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE),
  161.                       ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages,
  162.                       (int) flags);
  163. }
  164.  
  165. /** Wrapper for SYS_ENABLE_IOSPACE syscall.
  166.  *
  167.  * @param User space address of DDI argument structure.
  168.  *
  169.  * @return 0 on success, otherwise it returns error code found in errno.h
  170.  */
  171. __native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
  172. {
  173.     ddi_ioarg_t arg;
  174.     int rc;
  175.    
  176.     rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
  177.     if (rc != 0)
  178.         return (__native) rc;
  179.        
  180.     return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);
  181. }
  182.  
  183. /** Disable or enable preemption.
  184.  *
  185.  * @param enable If non-zero, the preemption counter will be decremented, leading to potential
  186.  *       enabling of preemption. Otherwise the preemption counter will be incremented,
  187.  *       preventing preemption from occurring.
  188.  *
  189.  * @return Zero on success or EPERM if callers capabilities are not sufficient.
  190.  */
  191. __native sys_preempt_control(int enable)
  192. {
  193.         if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)
  194.                 return EPERM;
  195.         if (enable)
  196.                 preemption_enable();
  197.         else
  198.                 preemption_disable();
  199.         return 0;
  200. }
  201.