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  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.  
  48. /** Initializes page tables.
  49.  *
  50.  * 1:1 virtual-physical mapping is created in kernel address space. Mapping
  51.  * for table with exception vectors is also created.
  52.  */
  53. void page_arch_init(void)
  54. {
  55.     uintptr_t cur;
  56.     int flags;
  57.  
  58.     page_mapping_operations = &pt_mapping_operations;
  59.  
  60.     flags = PAGE_CACHEABLE;
  61.  
  62.     // PA2KA(identity) mapping for all frames until last_frame
  63.     for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
  64.         page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
  65.     }
  66.    
  67.     // create mapping for exception table at high offset
  68.     #ifdef HIGH_EXCEPTION_VECTORS
  69.         void *virtaddr = frame_alloc(ONE_FRAME, FRAME_KA);
  70.         page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags);
  71.     #else
  72.         #error "Only high exception vector supported now"
  73.     #endif
  74.  
  75.     as_switch(NULL, AS_KERNEL);
  76.  
  77.     boot_page_table_free();
  78. }
  79.  
  80. /** Maps device into the kernel space.
  81.  *
  82.  * Maps physical address of device into kernel virtual address space (so it can
  83.  * be accessed only by kernel through virtual address).
  84.  *
  85.  * @param physaddr Physical address where device is connected.
  86.  * @param size Length of area where device is present.
  87.  *
  88.  * @return Virtual address where device will be accessible.
  89.  */
  90. uintptr_t hw_map(uintptr_t physaddr, size_t size)
  91. {
  92.     if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) {
  93.         panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
  94.     }
  95.  
  96.     uintptr_t virtaddr = PA2KA(last_frame);
  97.     pfn_t i;
  98.     for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) {
  99.         page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i),
  100.             PAGE_NOT_CACHEABLE | PAGE_READ | PAGE_WRITE | PAGE_KERNEL);
  101.     }
  102.  
  103.     last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
  104.     return virtaddr;
  105. }
  106.  
  107.  
  108. /** @}
  109.  */
  110.  
  111.