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  1. /*
  2.  * Copyright (c) 2005 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 sparc64mm  
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <arch/mm/page.h>
  36. #include <arch/mm/tlb.h>
  37. #include <genarch/mm/page_ht.h>
  38. #include <mm/frame.h>
  39. #include <arch/mm/frame.h>
  40. #include <bitops.h>
  41. #include <debug.h>
  42. #include <align.h>
  43. #include <config.h>
  44.  
  45. #ifdef CONFIG_SMP
  46. /** Entries locked in DTLB of BSP.
  47.  *
  48.  * Application processors need to have the same locked entries in their DTLBs as
  49.  * the bootstrap processor.
  50.  */
  51. static struct {
  52.     uintptr_t virt_page;
  53.     uintptr_t phys_page;
  54.     int pagesize_code;
  55. } bsp_locked_dtlb_entry[DTLB_MAX_LOCKED_ENTRIES];
  56.  
  57. /** Number of entries in bsp_locked_dtlb_entry array. */
  58. static count_t bsp_locked_dtlb_entries = 0;
  59. #endif /* CONFIG_SMP */
  60.  
  61. /** Perform sparc64 specific initialization of paging. */
  62. void page_arch_init(void)
  63. {
  64.     if (config.cpu_active == 1) {
  65.         page_mapping_operations = &ht_mapping_operations;
  66.     } else {
  67.  
  68. #ifdef CONFIG_SMP
  69.         unsigned int i;
  70.  
  71.         /*
  72.          * Copy locked DTLB entries from the BSP.
  73.          */    
  74.         for (i = 0; i < bsp_locked_dtlb_entries; i++) {
  75.             dtlb_insert_mapping(bsp_locked_dtlb_entry[i].virt_page,
  76.                 bsp_locked_dtlb_entry[i].phys_page,
  77.                 bsp_locked_dtlb_entry[i].pagesize_code, true,
  78.                 false);
  79.         }
  80. #endif 
  81.  
  82.     }
  83. }
  84.  
  85. /** Map memory-mapped device into virtual memory.
  86.  *
  87.  * So far, only DTLB is used to map devices into memory. Chances are that there
  88.  * will be only a limited amount of devices that the kernel itself needs to
  89.  * lock in DTLB.
  90.  *
  91.  * @param physaddr Physical address of the page where the device is located.
  92.  *  Must be at least page-aligned.
  93.  * @param size Size of the device's registers. Must not exceed 4M and must
  94.  *  include extra space caused by the alignment.
  95.  *
  96.  * @return Virtual address of the page where the device is mapped.
  97.  */
  98. uintptr_t hw_map(uintptr_t physaddr, size_t size)
  99. {
  100.     unsigned int order;
  101.     unsigned int i;
  102.  
  103.     ASSERT(config.cpu_active == 1);
  104.  
  105.     struct {
  106.         int pagesize_code;
  107.         size_t increment;
  108.         count_t count;
  109.     } sizemap[] = {
  110.         { PAGESIZE_8K, 0, 1 },              /* 8K */
  111.         { PAGESIZE_8K, MMU_PAGE_SIZE, 2 },      /* 16K */
  112.         { PAGESIZE_8K, MMU_PAGE_SIZE, 4 },      /* 32K */
  113.         { PAGESIZE_64K, 0, 1},              /* 64K */
  114.         { PAGESIZE_64K, 8 * MMU_PAGE_SIZE, 2 },     /* 128K */
  115.         { PAGESIZE_64K, 8 * MMU_PAGE_SIZE, 4 },     /* 256K */
  116.         { PAGESIZE_512K, 0, 1 },            /* 512K */
  117.         { PAGESIZE_512K, 64 * MMU_PAGE_SIZE, 2 },   /* 1M */
  118.         { PAGESIZE_512K, 64 * MMU_PAGE_SIZE, 4 },   /* 2M */
  119.         { PAGESIZE_4M, 0, 1 },              /* 4M */
  120.         { PAGESIZE_4M, 512 * MMU_PAGE_SIZE, 2 }     /* 8M */
  121.     };
  122.    
  123.     ASSERT(ALIGN_UP(physaddr, MMU_PAGE_SIZE) == physaddr);
  124.     ASSERT(size <= 8 * 1024 * 1024);
  125.    
  126.     if (size <= MMU_FRAME_SIZE)
  127.         order = 0;
  128.     else
  129.         order = (fnzb64(size - 1) + 1) - MMU_FRAME_WIDTH;
  130.  
  131.     /*
  132.      * Use virtual addresses that are beyond the limit of physical memory.
  133.      * Thus, the physical address space will not be wasted by holes created
  134.      * by frame_alloc().
  135.      */
  136.     ASSERT(PA2KA(last_frame));
  137.     uintptr_t virtaddr = ALIGN_UP(PA2KA(last_frame),
  138.         1 << (order + FRAME_WIDTH));
  139.     last_frame = ALIGN_UP(KA2PA(virtaddr) + size,
  140.         1 << (order + FRAME_WIDTH));
  141.    
  142.     for (i = 0; i < sizemap[order].count; i++) {
  143.         /*
  144.          * First, insert the mapping into DTLB.
  145.          */
  146.         dtlb_insert_mapping(virtaddr + i * sizemap[order].increment,
  147.             physaddr + i * sizemap[order].increment,
  148.             sizemap[order].pagesize_code, true, false);
  149.    
  150. #ifdef CONFIG_SMP  
  151.         /*
  152.          * Second, save the information about the mapping for APs.
  153.          */
  154.         bsp_locked_dtlb_entry[bsp_locked_dtlb_entries].virt_page =
  155.             virtaddr + i * sizemap[order].increment;
  156.         bsp_locked_dtlb_entry[bsp_locked_dtlb_entries].phys_page =
  157.             physaddr + i * sizemap[order].increment;
  158.         bsp_locked_dtlb_entry[bsp_locked_dtlb_entries].pagesize_code =
  159.             sizemap[order].pagesize_code;
  160.         bsp_locked_dtlb_entries++;
  161. #endif
  162.     }
  163.    
  164.     return virtaddr;
  165. }
  166.  
  167. /** @}
  168.  */
  169.  
  170.