Subversion Repositories HelenOS

Rev

Rev 3790 | Rev 3973 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

  1. /*
  2.  * Copyright (c) 2007 Pavel Jancik, Michal Kebrt
  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 arm32mm
  30.  * @{
  31.  */
  32. /** @file
  33.  *  @brief Paging related functions.
  34.  */
  35.  
  36. #include <arch/mm/page.h>
  37. #include <genarch/mm/page_pt.h>
  38. #include <mm/page.h>
  39. #include <align.h>
  40. #include <config.h>
  41. #include <arch/exception.h>
  42. #include <typedefs.h>
  43. #include <arch/types.h>
  44. #include <interrupt.h>
  45. #include <arch/mm/frame.h>
  46.  
  47. /** Initializes page tables.
  48.  *
  49.  * 1:1 virtual-physical mapping is created in kernel address space. Mapping
  50.  * for table with exception vectors is also created.
  51.  */
  52. void page_arch_init(void)
  53. {
  54.     uintptr_t cur;
  55.     int flags;
  56.  
  57.     page_mapping_operations = &pt_mapping_operations;
  58.  
  59.     flags = PAGE_CACHEABLE;
  60.  
  61.     /* PA2KA(identity) mapping for all frames until last_frame */
  62.     for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
  63.         page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
  64.     }
  65.    
  66.     /* create mapping for exception table at high offset */
  67. #ifdef HIGH_EXCEPTION_VECTORS
  68.     void *virtaddr = frame_alloc(ONE_FRAME, FRAME_KA);
  69.     page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags);
  70. #else
  71. #error "Only high exception vector supported now"
  72. #endif
  73.  
  74.     as_switch(NULL, AS_KERNEL);
  75.  
  76.     boot_page_table_free();
  77. }
  78.  
  79. /** Maps device into the kernel space.
  80.  *
  81.  * Maps physical address of device into kernel virtual address space (so it can
  82.  * be accessed only by kernel through virtual address).
  83.  *
  84.  * @param physaddr Physical address where device is connected.
  85.  * @param size Length of area where device is present.
  86.  *
  87.  * @return Virtual address where device will be accessible.
  88.  */
  89. uintptr_t hw_map(uintptr_t physaddr, size_t size)
  90. {
  91.     if (last_frame + ALIGN_UP(size, PAGE_SIZE) >
  92.         KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) {
  93.         panic("Unable to map physical memory %p (%d bytes).",
  94.             physaddr, size)
  95.     }
  96.  
  97.     uintptr_t virtaddr = PA2KA(last_frame);
  98.     pfn_t i;
  99.     for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) {
  100.         page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i),
  101.             physaddr + PFN2ADDR(i),
  102.             PAGE_NOT_CACHEABLE | PAGE_READ | PAGE_WRITE | PAGE_KERNEL);
  103.     }
  104.  
  105.     last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
  106.     return virtaddr;
  107. }
  108.  
  109. void hw_area(uintptr_t *physaddr, pfn_t *frames)
  110. {
  111.     *physaddr = end_frame;
  112.     *frames = ADDR2PFN(0xffffffff - end_frame);
  113. }
  114.  
  115. /** @}
  116.  */
  117.