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  1. /*
  2.  * Copyright (c) 2001-2005 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 ia32   
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifdef CONFIG_SMP
  36.  
  37. #include <config.h>
  38. #include <print.h>
  39. #include <debug.h>
  40. #include <arch/smp/mps.h>
  41. #include <arch/smp/apic.h>
  42. #include <arch/smp/smp.h>
  43. #include <func.h>
  44. #include <arch/types.h>
  45. #include <typedefs.h>
  46. #include <cpu.h>
  47. #include <arch/asm.h>
  48. #include <arch/bios/bios.h>
  49. #include <mm/frame.h>
  50.  
  51. /*
  52.  * MultiProcessor Specification detection code.
  53.  */
  54.  
  55. #define FS_SIGNATURE    0x5f504d5f
  56. #define CT_SIGNATURE    0x504d4350
  57.  
  58. int mps_fs_check(uint8_t *base);
  59. int mps_ct_check(void);
  60.  
  61. int configure_via_ct(void);
  62. int configure_via_default(uint8_t n);
  63.  
  64. int ct_processor_entry(struct __processor_entry *pr);
  65. void ct_bus_entry(struct __bus_entry *bus);
  66. void ct_io_apic_entry(struct __io_apic_entry *ioa);
  67. void ct_io_intr_entry(struct __io_intr_entry *iointr);
  68. void ct_l_intr_entry(struct __l_intr_entry *lintr);
  69.  
  70. void ct_extended_entries(void);
  71.  
  72. static struct mps_fs *fs;
  73. static struct mps_ct *ct;
  74.  
  75. struct __processor_entry *processor_entries = NULL;
  76. struct __bus_entry *bus_entries = NULL;
  77. struct __io_apic_entry *io_apic_entries = NULL;
  78. struct __io_intr_entry *io_intr_entries = NULL;
  79. struct __l_intr_entry *l_intr_entries = NULL;
  80.  
  81. int processor_entry_cnt = 0;
  82. int bus_entry_cnt = 0;
  83. int io_apic_entry_cnt = 0;
  84. int io_intr_entry_cnt = 0;
  85. int l_intr_entry_cnt = 0;
  86.  
  87. /*
  88.  * Implementation of IA-32 SMP configuration interface.
  89.  */
  90. static count_t get_cpu_count(void);
  91. static bool is_cpu_enabled(index_t i);
  92. static bool is_bsp(index_t i);
  93. static uint8_t get_cpu_apic_id(index_t i);
  94. static int mps_irq_to_pin(int irq);
  95.  
  96. struct smp_config_operations mps_config_operations = {
  97.     .cpu_count = get_cpu_count,
  98.     .cpu_enabled = is_cpu_enabled,
  99.     .cpu_bootstrap = is_bsp,
  100.     .cpu_apic_id = get_cpu_apic_id,
  101.     .irq_to_pin = mps_irq_to_pin
  102. };
  103.  
  104. count_t get_cpu_count(void)
  105. {
  106.     return processor_entry_cnt;
  107. }
  108.  
  109. bool is_cpu_enabled(index_t i)
  110. {
  111.     ASSERT(i < processor_entry_cnt);
  112.     return processor_entries[i].cpu_flags & 0x1;
  113. }
  114.  
  115. bool is_bsp(index_t i)
  116. {
  117.     ASSERT(i < processor_entry_cnt);
  118.     return processor_entries[i].cpu_flags & 0x2;
  119. }
  120.  
  121. uint8_t get_cpu_apic_id(index_t i)
  122. {
  123.     ASSERT(i < processor_entry_cnt);
  124.     return processor_entries[i].l_apic_id;
  125. }
  126.  
  127.  
  128. /*
  129.  * Used to check the integrity of the MP Floating Structure.
  130.  */
  131. int mps_fs_check(uint8_t *base)
  132. {
  133.     int i;
  134.     uint8_t sum;
  135.    
  136.     for (i = 0, sum = 0; i < 16; i++)
  137.         sum += base[i];
  138.    
  139.     return !sum;
  140. }
  141.  
  142. /*
  143.  * Used to check the integrity of the MP Configuration Table.
  144.  */
  145. int mps_ct_check(void)
  146. {
  147.     uint8_t *base = (uint8_t *) ct;
  148.     uint8_t *ext = base + ct->base_table_length;
  149.     uint8_t sum;
  150.     int i; 
  151.    
  152.     /* count the checksum for the base table */
  153.     for (i=0,sum=0; i < ct->base_table_length; i++)
  154.         sum += base[i];
  155.        
  156.     if (sum)
  157.         return 0;
  158.        
  159.     /* count the checksum for the extended table */
  160.     for (i=0,sum=0; i < ct->ext_table_length; i++)
  161.         sum += ext[i];
  162.        
  163.     return sum == ct->ext_table_checksum;
  164. }
  165.  
  166. void mps_init(void)
  167. {
  168.     uint8_t *addr[2] = { NULL, (uint8_t *) PA2KA(0xf0000) };
  169.     int i, j, length[2] = { 1024, 64*1024 };
  170.    
  171.  
  172.     /*
  173.      * Find MP Floating Pointer Structure
  174.      * 1a. search first 1K of EBDA
  175.      * 1b. if EBDA is undefined, search last 1K of base memory
  176.      *  2. search 64K starting at 0xf0000
  177.      */
  178.  
  179.     addr[0] = (uint8_t *) PA2KA(ebda ? ebda : 639 * 1024);
  180.     for (i = 0; i < 2; i++) {
  181.         for (j = 0; j < length[i]; j += 16) {
  182.             if (*((uint32_t *) &addr[i][j]) == FS_SIGNATURE && mps_fs_check(&addr[i][j])) {
  183.                 fs = (struct mps_fs *) &addr[i][j];
  184.                 goto fs_found;
  185.             }
  186.         }
  187.     }
  188.  
  189.     return;
  190.    
  191. fs_found:
  192.     printf("%p: MPS Floating Pointer Structure\n", fs);
  193.  
  194.     if (fs->config_type == 0 && fs->configuration_table) {
  195.         if (fs->mpfib2 >> 7) {
  196.             printf("%s: PIC mode not supported\n", __FUNCTION__);
  197.             return;
  198.         }
  199.  
  200.         ct = (struct mps_ct *)PA2KA((uintptr_t)fs->configuration_table);
  201.         config.cpu_count = configure_via_ct();
  202.     }
  203.     else
  204.         config.cpu_count = configure_via_default(fs->config_type);
  205.  
  206.     return;
  207. }
  208.  
  209. int configure_via_ct(void)
  210. {
  211.     uint8_t *cur;
  212.     int i, cnt;
  213.        
  214.     if (ct->signature != CT_SIGNATURE) {
  215.         printf("%s: bad ct->signature\n", __FUNCTION__);
  216.         return 1;
  217.     }
  218.     if (!mps_ct_check()) {
  219.         printf("%s: bad ct checksum\n", __FUNCTION__);
  220.         return 1;
  221.     }
  222.     if (ct->oem_table) {
  223.         printf("%s: ct->oem_table not supported\n", __FUNCTION__);
  224.         return 1;
  225.     }
  226.    
  227.     l_apic = (uint32_t *)(uintptr_t)ct->l_apic;
  228.  
  229.     cnt = 0;
  230.     cur = &ct->base_table[0];
  231.     for (i=0; i < ct->entry_count; i++) {
  232.         switch (*cur) {
  233.             /* Processor entry */
  234.             case 0:
  235.                 processor_entries = processor_entries ? processor_entries : (struct __processor_entry *) cur;
  236.                 processor_entry_cnt++;
  237.                 cnt += ct_processor_entry((struct __processor_entry *) cur);
  238.                 cur += 20;
  239.                 break;
  240.  
  241.             /* Bus entry */
  242.             case 1:
  243.                 bus_entries = bus_entries ? bus_entries : (struct __bus_entry *) cur;
  244.                 bus_entry_cnt++;
  245.                 ct_bus_entry((struct __bus_entry *) cur);
  246.                 cur += 8;
  247.                 break;
  248.                
  249.             /* I/O Apic */
  250.             case 2:
  251.                 io_apic_entries = io_apic_entries ? io_apic_entries : (struct __io_apic_entry *) cur;
  252.                 io_apic_entry_cnt++;
  253.                 ct_io_apic_entry((struct __io_apic_entry *) cur);
  254.                 cur += 8;
  255.                 break;
  256.                
  257.             /* I/O Interrupt Assignment */
  258.             case 3:
  259.                 io_intr_entries = io_intr_entries ? io_intr_entries : (struct __io_intr_entry *) cur;
  260.                 io_intr_entry_cnt++;
  261.                 ct_io_intr_entry((struct __io_intr_entry *) cur);
  262.                 cur += 8;
  263.                 break;
  264.  
  265.             /* Local Interrupt Assignment */
  266.             case 4:
  267.                 l_intr_entries = l_intr_entries ? l_intr_entries : (struct __l_intr_entry *) cur;
  268.                 l_intr_entry_cnt++;
  269.                 ct_l_intr_entry((struct __l_intr_entry *) cur);
  270.                 cur += 8;
  271.                 break;
  272.  
  273.             default:
  274.                 /*
  275.                  * Something is wrong. Fallback to UP mode.
  276.                  */
  277.                  
  278.                 printf("%s: ct badness\n", __FUNCTION__);
  279.                 return 1;
  280.         }
  281.     }
  282.    
  283.     /*
  284.      * Process extended entries.
  285.      */
  286.     ct_extended_entries();
  287.     return cnt;
  288. }
  289.  
  290. int configure_via_default(uint8_t n)
  291. {
  292.     /*
  293.      * Not yet implemented.
  294.      */
  295.     printf("%s: not supported\n", __FUNCTION__);
  296.     return 1;
  297. }
  298.  
  299.  
  300. int ct_processor_entry(struct __processor_entry *pr)
  301. {
  302.     /*
  303.      * Ignore processors which are not marked enabled.
  304.      */
  305.     if ((pr->cpu_flags & (1<<0)) == 0)
  306.         return 0;
  307.    
  308.     apic_id_mask |= (1<<pr->l_apic_id);
  309.     return 1;
  310. }
  311.  
  312. void ct_bus_entry(struct __bus_entry *bus)
  313. {
  314. #ifdef MPSCT_VERBOSE
  315.     char buf[7];
  316.     memcpy((void *) buf, (void *) bus->bus_type, 6);
  317.     buf[6] = 0;
  318.     printf("bus%d: %s\n", bus->bus_id, buf);
  319. #endif
  320. }
  321.  
  322. void ct_io_apic_entry(struct __io_apic_entry *ioa)
  323. {
  324.     static int io_apic_count = 0;
  325.  
  326.     /* this ioapic is marked unusable */
  327.     if ((ioa->io_apic_flags & 1) == 0)
  328.         return;
  329.    
  330.     if (io_apic_count++ > 0) {
  331.         /*
  332.          * Multiple IO APIC's are currently not supported.
  333.          */
  334.         return;
  335.     }
  336.    
  337.     io_apic = (uint32_t *)(uintptr_t)ioa->io_apic;
  338. }
  339.  
  340. //#define MPSCT_VERBOSE
  341. void ct_io_intr_entry(struct __io_intr_entry *iointr)
  342. {
  343. #ifdef MPSCT_VERBOSE
  344.     switch (iointr->intr_type) {
  345.         case 0: printf("INT"); break;
  346.         case 1: printf("NMI"); break;
  347.         case 2: printf("SMI"); break;
  348.         case 3: printf("ExtINT"); break;
  349.     }
  350.     putchar(',');
  351.     switch (iointr->poel&3) {
  352.         case 0: printf("bus-like"); break;
  353.         case 1: printf("active high"); break;
  354.         case 2: printf("reserved"); break;
  355.         case 3: printf("active low"); break;
  356.     }
  357.     putchar(',');
  358.     switch ((iointr->poel>>2)&3) {
  359.         case 0: printf("bus-like"); break;
  360.         case 1: printf("edge-triggered"); break;
  361.         case 2: printf("reserved"); break;
  362.         case 3: printf("level-triggered"); break;
  363.     }
  364.     putchar(',');
  365.     printf("bus%d,irq%d", iointr->src_bus_id, iointr->src_bus_irq);
  366.     putchar(',');
  367.     printf("io_apic%d,pin%d", iointr->dst_io_apic_id, iointr->dst_io_apic_pin);
  368.     putchar('\n'); 
  369. #endif
  370. }
  371.  
  372. void ct_l_intr_entry(struct __l_intr_entry *lintr)
  373. {
  374. #ifdef MPSCT_VERBOSE
  375.     switch (lintr->intr_type) {
  376.         case 0: printf("INT"); break;
  377.         case 1: printf("NMI"); break;
  378.         case 2: printf("SMI"); break;
  379.         case 3: printf("ExtINT"); break;
  380.     }
  381.     putchar(',');
  382.     switch (lintr->poel&3) {
  383.         case 0: printf("bus-like"); break;
  384.         case 1: printf("active high"); break;
  385.         case 2: printf("reserved"); break;
  386.         case 3: printf("active low"); break;
  387.     }
  388.     putchar(',');
  389.     switch ((lintr->poel>>2)&3) {
  390.         case 0: printf("bus-like"); break;
  391.         case 1: printf("edge-triggered"); break;
  392.         case 2: printf("reserved"); break;
  393.         case 3: printf("level-triggered"); break;
  394.     }
  395.     putchar(',');
  396.     printf("bus%d,irq%d", lintr->src_bus_id, lintr->src_bus_irq);
  397.     putchar(',');
  398.     printf("l_apic%d,pin%d", lintr->dst_l_apic_id, lintr->dst_l_apic_pin);
  399.     putchar('\n');
  400. #endif
  401. }
  402.  
  403. void ct_extended_entries(void)
  404. {
  405.     uint8_t *ext = (uint8_t *) ct + ct->base_table_length;
  406.     uint8_t *cur;
  407.  
  408.     for (cur = ext; cur < ext + ct->ext_table_length; cur += cur[CT_EXT_ENTRY_LEN]) {
  409.         switch (cur[CT_EXT_ENTRY_TYPE]) {
  410.             default:
  411.                 printf("%p: skipping MP Configuration Table extended entry type %d\n", cur, cur[CT_EXT_ENTRY_TYPE]);
  412.                 break;
  413.         }
  414.     }
  415. }
  416.  
  417. int mps_irq_to_pin(int irq)
  418. {
  419.     int i;
  420.    
  421.     for(i=0;i<io_intr_entry_cnt;i++) {
  422.         if (io_intr_entries[i].src_bus_irq == irq && io_intr_entries[i].intr_type == 0)
  423.             return io_intr_entries[i].dst_io_apic_pin;
  424.     }
  425.    
  426.     return -1;
  427. }
  428.  
  429. #endif /* CONFIG_SMP */
  430.  
  431. /** @}
  432.  */
  433.