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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 mips32mm   
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <macros.h>
  36. #include <arch/mm/frame.h>
  37. #include <arch/mm/tlb.h>
  38. #include <interrupt.h>
  39. #include <mm/frame.h>
  40. #include <mm/asid.h>
  41. #include <config.h>
  42. #include <arch/drivers/msim.h>
  43. #include <arch/drivers/serial.h>
  44. #include <print.h>
  45.  
  46. #define ZERO_PAGE_MASK      TLB_PAGE_MASK_256K
  47. #define ZERO_FRAMES         16384
  48. #define ZERO_PAGE_WIDTH     18  /* 256K */
  49. #define ZERO_PAGE_SIZE      (1 << ZERO_PAGE_WIDTH)
  50. #define ZERO_PAGE_ASID      ASID_INVALID
  51. #define ZERO_PAGE_TLBI      0
  52. #define ZERO_PAGE_ADDR      0
  53. #define ZERO_PAGE_OFFSET    (ZERO_PAGE_SIZE / sizeof(uint32_t) - 1)
  54. #define ZERO_PAGE_VALUE     (((volatile uint32_t *) ZERO_PAGE_ADDR)[ZERO_PAGE_OFFSET])
  55.  
  56. #define MAX_REGIONS         32
  57.  
  58. typedef struct {
  59.     pfn_t start;
  60.     pfn_t count;
  61. } phys_region_t;
  62.  
  63. static count_t phys_regions_count = 0;
  64. static phys_region_t phys_regions[MAX_REGIONS];
  65.  
  66.  
  67. /** Check whether frame is available
  68.  *
  69.  * Returns true if given frame is generally available for use.
  70.  * Returns false if given frame is used for physical memory
  71.  * mapped devices and cannot be used.
  72.  *
  73.  */
  74. static bool frame_available(pfn_t frame)
  75. {
  76.     /* MSIM device (dprinter) */
  77.     if (frame == (KA2PA(MSIM_VIDEORAM) >> ZERO_PAGE_WIDTH))
  78.         return false;
  79.    
  80.     /* MSIM device (dkeyboard) */
  81.     if (frame == (KA2PA(MSIM_KBD_ADDRESS) >> ZERO_PAGE_WIDTH))
  82.         return false;
  83.    
  84.     /* Simics device (serial line) */
  85.     if (frame == (KA2PA(SERIAL_ADDRESS) >> ZERO_PAGE_WIDTH))
  86.         return false;
  87.    
  88.     return true;
  89. }
  90.  
  91.  
  92. /** Check whether frame is safe to write
  93.  *
  94.  * Returns true if given frame is safe for read/write test.
  95.  * Returns false if given frame should not be touched.
  96.  *
  97.  */
  98. static bool frame_safe(pfn_t frame)
  99. {
  100.     /* Kernel structures */
  101.     if ((frame << ZERO_PAGE_WIDTH) < KA2PA(config.base))
  102.         return false;
  103.    
  104.     /* Kernel */
  105.     if (overlaps(frame << ZERO_PAGE_WIDTH, ZERO_PAGE_SIZE,
  106.         KA2PA(config.base), config.kernel_size))
  107.         return false;
  108.    
  109.     /* Kernel stack */
  110.     if (overlaps(frame << ZERO_PAGE_WIDTH, ZERO_PAGE_SIZE,
  111.         KA2PA(config.stack_base), config.stack_size))
  112.         return false;
  113.    
  114.     /* Init tasks */
  115.     bool safe = true;
  116.     count_t i;
  117.     for (i = 0; i < init.cnt; i++)
  118.         if (overlaps(frame << ZERO_PAGE_WIDTH, ZERO_PAGE_SIZE,
  119.             KA2PA(init.tasks[i].addr), init.tasks[i].size)) {
  120.             safe = false;
  121.             break;
  122.         }
  123.    
  124.     return safe;
  125. }
  126.  
  127. static void frame_add_region(pfn_t start_frame, pfn_t end_frame)
  128. {
  129.     if (end_frame > start_frame) {
  130.         /* Convert 1M frames to 16K frames */
  131.         pfn_t first = ADDR2PFN(start_frame << ZERO_PAGE_WIDTH);
  132.         pfn_t count = ADDR2PFN((end_frame - start_frame) << ZERO_PAGE_WIDTH);
  133.        
  134.         /* Interrupt vector frame is blacklisted */
  135.         pfn_t conf_frame;
  136.         if (start_frame == 0)
  137.             conf_frame = 1;
  138.         else
  139.             conf_frame = first;
  140.        
  141.         zone_create(first, count, conf_frame, 0);
  142.        
  143.         if (phys_regions_count < MAX_REGIONS) {
  144.             phys_regions[phys_regions_count].start = first;
  145.             phys_regions[phys_regions_count].count = count;
  146.             phys_regions_count++;
  147.         }
  148.     }
  149. }
  150.  
  151.  
  152. /** Create memory zones
  153.  *
  154.  * Walk through available 1 MB chunks of physical
  155.  * memory and create zones.
  156.  *
  157.  * Note: It is assumed that the TLB is not yet being
  158.  * used in any way, thus there is no interference.
  159.  *
  160.  */
  161. void frame_arch_init(void)
  162. {
  163.     ipl_t ipl = interrupts_disable();
  164.    
  165.     /* Clear and initialize TLB */
  166.     cp0_pagemask_write(ZERO_PAGE_MASK);
  167.     cp0_entry_lo0_write(0);
  168.     cp0_entry_lo1_write(0);
  169.     cp0_entry_hi_write(0);
  170.  
  171.     count_t i;
  172.     for (i = 0; i < TLB_ENTRY_COUNT; i++) {
  173.         cp0_index_write(i);
  174.         tlbwi();
  175.     }
  176.        
  177.     pfn_t start_frame = 0;
  178.     pfn_t frame;
  179.     bool avail = true;
  180.    
  181.     /* Walk through all 1 MB frames */
  182.     for (frame = 0; frame < ZERO_FRAMES; frame++) {
  183.         if (!frame_available(frame))
  184.             avail = false;
  185.         else {
  186.             if (frame_safe(frame)) {
  187.                 entry_lo_t lo0;
  188.                 entry_lo_t lo1;
  189.                 entry_hi_t hi;
  190.                 tlb_prepare_entry_lo(&lo0, false, true, true, false, frame << (ZERO_PAGE_WIDTH - 12));
  191.                 tlb_prepare_entry_lo(&lo1, false, false, false, false, 0);
  192.                 tlb_prepare_entry_hi(&hi, ZERO_PAGE_ASID, ZERO_PAGE_ADDR);
  193.                
  194.                 cp0_pagemask_write(ZERO_PAGE_MASK);
  195.                 cp0_entry_lo0_write(lo0.value);
  196.                 cp0_entry_lo1_write(lo1.value);
  197.                 cp0_entry_hi_write(hi.value);
  198.                 cp0_index_write(ZERO_PAGE_TLBI);
  199.                 tlbwi();
  200.                
  201.                 ZERO_PAGE_VALUE = 0;
  202.                 if (ZERO_PAGE_VALUE != 0)
  203.                     avail = false;
  204.                 else {
  205.                     ZERO_PAGE_VALUE = 0xdeadbeef;
  206.                     if (ZERO_PAGE_VALUE != 0xdeadbeef)
  207.                         avail = false;
  208.                 }
  209.             }
  210.         }
  211.        
  212.         if (!avail) {
  213.             frame_add_region(start_frame, frame);
  214.             start_frame = frame + 1;
  215.             avail = true;
  216.         }
  217.     }
  218.    
  219.     frame_add_region(start_frame, frame);
  220.    
  221.     /* Blacklist interrupt vector frame */
  222.     frame_mark_unavailable(0, 1);
  223.    
  224.     /* Cleanup */
  225.     cp0_pagemask_write(ZERO_PAGE_MASK);
  226.     cp0_entry_lo0_write(0);
  227.     cp0_entry_lo1_write(0);
  228.     cp0_entry_hi_write(0);
  229.     cp0_index_write(ZERO_PAGE_TLBI);
  230.     tlbwi();
  231.    
  232.     interrupts_restore(ipl);
  233. }
  234.  
  235.  
  236. void physmem_print(void)
  237. {
  238.     printf("Base       Size\n");
  239.     printf("---------- ----------\n");
  240.    
  241.     count_t i;
  242.     for (i = 0; i < phys_regions_count; i++) {
  243.         printf("%#010x %10u\n",
  244.             PFN2ADDR(phys_regions[i].start), PFN2ADDR(phys_regions[i].count));
  245.     }  
  246. }
  247.  
  248. /** @}
  249.  */
  250.