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  1. /*
  2.  * Copyright (c) 2008 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 <cpu.h>
  46. #include <arch/asm.h>
  47. #include <arch/bios/bios.h>
  48. #include <mm/frame.h>
  49.  
  50. /*
  51.  * MultiProcessor Specification detection code.
  52.  */
  53.  
  54. #define FS_SIGNATURE    0x5f504d5f
  55. #define CT_SIGNATURE    0x504d4350
  56.  
  57. static int mps_fs_check(uint8_t *base);
  58. static int mps_ct_check(void);
  59.  
  60. static int configure_via_ct(void);
  61. static int configure_via_default(uint8_t n);
  62.  
  63. static int ct_processor_entry(struct __processor_entry *pr);
  64. static void ct_bus_entry(struct __bus_entry *bus);
  65. static void ct_io_apic_entry(struct __io_apic_entry *ioa);
  66. static void ct_io_intr_entry(struct __io_intr_entry *iointr);
  67. static void ct_l_intr_entry(struct __l_intr_entry *lintr);
  68.  
  69. static void ct_extended_entries(void);
  70.  
  71. static struct mps_fs *fs;
  72. static struct mps_ct *ct;
  73.  
  74. struct __processor_entry *processor_entries = NULL;
  75. struct __bus_entry *bus_entries = NULL;
  76. struct __io_apic_entry *io_apic_entries = NULL;
  77. struct __io_intr_entry *io_intr_entries = NULL;
  78. struct __l_intr_entry *l_intr_entries = NULL;
  79.  
  80. unsigned int processor_entry_cnt = 0;
  81. unsigned int bus_entry_cnt = 0;
  82. unsigned int io_apic_entry_cnt = 0;
  83. unsigned int io_intr_entry_cnt = 0;
  84. unsigned int l_intr_entry_cnt = 0;
  85.  
  86. /*
  87.  * Implementation of IA-32 SMP configuration interface.
  88.  */
  89. static size_t get_cpu_count(void);
  90. static bool is_cpu_enabled(size_t i);
  91. static bool is_bsp(size_t i);
  92. static uint8_t get_cpu_apic_id(size_t i);
  93. static int mps_irq_to_pin(unsigned int irq);
  94.  
  95. struct smp_config_operations mps_config_operations = {
  96.     .cpu_count = get_cpu_count,
  97.     .cpu_enabled = is_cpu_enabled,
  98.     .cpu_bootstrap = is_bsp,
  99.     .cpu_apic_id = get_cpu_apic_id,
  100.     .irq_to_pin = mps_irq_to_pin
  101. };
  102.  
  103. size_t get_cpu_count(void)
  104. {
  105.     return processor_entry_cnt;
  106. }
  107.  
  108. bool is_cpu_enabled(size_t i)
  109. {
  110.     ASSERT(i < processor_entry_cnt);
  111.     return (bool) ((processor_entries[i].cpu_flags & 0x01) == 0x01);
  112. }
  113.  
  114. bool is_bsp(size_t i)
  115. {
  116.     ASSERT(i < processor_entry_cnt);
  117.     return (bool) ((processor_entries[i].cpu_flags & 0x02) == 0x02);
  118. }
  119.  
  120. uint8_t get_cpu_apic_id(size_t i)
  121. {
  122.     ASSERT(i < processor_entry_cnt);
  123.     return processor_entries[i].l_apic_id;
  124. }
  125.  
  126.  
  127. /*
  128.  * Used to check the integrity of the MP Floating Structure.
  129.  */
  130. int mps_fs_check(uint8_t *base)
  131. {
  132.     unsigned int i;
  133.     uint8_t sum;
  134.    
  135.     for (i = 0, sum = 0; i < 16; i++)
  136.         sum = (uint8_t) (sum + base[i]);
  137.    
  138.     return !sum;
  139. }
  140.  
  141. /*
  142.  * Used to check the integrity of the MP Configuration Table.
  143.  */
  144. int mps_ct_check(void)
  145. {
  146.     uint8_t *base = (uint8_t *) ct;
  147.     uint8_t *ext = base + ct->base_table_length;
  148.     uint8_t sum;
  149.     int i; 
  150.    
  151.     /* count the checksum for the base table */
  152.     for (i = 0,sum = 0; i < ct->base_table_length; i++)
  153.         sum = (uint8_t) (sum + base[i]);
  154.        
  155.     if (sum)
  156.         return 0;
  157.        
  158.     /* count the checksum for the extended table */
  159.     for (i = 0, sum = 0; i < ct->ext_table_length; i++)
  160.         sum = (uint8_t) (sum + ext[i]);
  161.        
  162.     return sum == ct->ext_table_checksum;
  163. }
  164.  
  165. void mps_init(void)
  166. {
  167.     uint8_t *addr[2] = { NULL, (uint8_t *) PA2KA(0xf0000) };
  168.     unsigned int i, j, length[2] = { 1024, 64 * 1024 };
  169.    
  170.  
  171.     /*
  172.      * Find MP Floating Pointer Structure
  173.      * 1a. search first 1K of EBDA
  174.      * 1b. if EBDA is undefined, search last 1K of base memory
  175.      *  2. search 64K starting at 0xf0000
  176.      */
  177.  
  178.     addr[0] = (uint8_t *) PA2KA(ebda ? ebda : 639 * 1024);
  179.     for (i = 0; i < 2; i++) {
  180.         for (j = 0; j < length[i]; j += 16) {
  181.             if (*((uint32_t *) &addr[i][j]) ==
  182.                 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", __func__);
  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.     unsigned int i, cnt;
  213.        
  214.     if (ct->signature != CT_SIGNATURE) {
  215.         printf("%s: bad ct->signature\n", __func__);
  216.         return 1;
  217.     }
  218.     if (!mps_ct_check()) {
  219.         printf("%s: bad ct checksum\n", __func__);
  220.         return 1;
  221.     }
  222.     if (ct->oem_table) {
  223.         printf("%s: ct->oem_table not supported\n", __func__);
  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 ?
  236.                 processor_entries :
  237.                 (struct __processor_entry *) cur;
  238.             processor_entry_cnt++;
  239.             cnt += ct_processor_entry((struct __processor_entry *)
  240.                 cur);
  241.             cur += 20;
  242.             break;
  243.  
  244.         /* Bus entry */
  245.         case 1:
  246.             bus_entries = bus_entries ?
  247.                 bus_entries : (struct __bus_entry *) cur;
  248.             bus_entry_cnt++;
  249.             ct_bus_entry((struct __bus_entry *) cur);
  250.             cur += 8;
  251.             break;
  252.                
  253.         /* I/O Apic */
  254.         case 2:
  255.             io_apic_entries = io_apic_entries ?
  256.                 io_apic_entries : (struct __io_apic_entry *) cur;
  257.                 io_apic_entry_cnt++;
  258.             ct_io_apic_entry((struct __io_apic_entry *) cur);
  259.             cur += 8;
  260.             break;
  261.                
  262.         /* I/O Interrupt Assignment */
  263.         case 3:
  264.             io_intr_entries = io_intr_entries ?
  265.                 io_intr_entries : (struct __io_intr_entry *) cur;
  266.             io_intr_entry_cnt++;
  267.             ct_io_intr_entry((struct __io_intr_entry *) cur);
  268.             cur += 8;
  269.             break;
  270.  
  271.         /* Local Interrupt Assignment */
  272.         case 4:
  273.             l_intr_entries = l_intr_entries ?
  274.                 l_intr_entries : (struct __l_intr_entry *) cur;
  275.             l_intr_entry_cnt++;
  276.             ct_l_intr_entry((struct __l_intr_entry *) cur);
  277.             cur += 8;
  278.             break;
  279.  
  280.         default:
  281.             /*
  282.              * Something is wrong. Fallback to UP mode.
  283.              */
  284.  
  285.             printf("%s: ct badness\n", __func__);
  286.             return 1;
  287.         }
  288.     }
  289.    
  290.     /*
  291.      * Process extended entries.
  292.      */
  293.     ct_extended_entries();
  294.     return cnt;
  295. }
  296.  
  297. int configure_via_default(uint8_t n __attribute__((unused)))
  298. {
  299.     /*
  300.      * Not yet implemented.
  301.      */
  302.     printf("%s: not supported\n", __func__);
  303.     return 1;
  304. }
  305.  
  306.  
  307. int ct_processor_entry(struct __processor_entry *pr __attribute__((unused)))
  308. {
  309.     /*
  310.      * Ignore processors which are not marked enabled.
  311.      */
  312.     if ((pr->cpu_flags & (1 << 0)) == 0)
  313.         return 0;
  314.    
  315.     apic_id_mask |= (1 << pr->l_apic_id);
  316.     return 1;
  317. }
  318.  
  319. void ct_bus_entry(struct __bus_entry *bus __attribute__((unused)))
  320. {
  321. #ifdef MPSCT_VERBOSE
  322.     char buf[7];
  323.     memcpy((void *) buf, (void *) bus->bus_type, 6);
  324.     buf[6] = 0;
  325.     printf("bus%d: %s\n", bus->bus_id, buf);
  326. #endif
  327. }
  328.  
  329. void ct_io_apic_entry(struct __io_apic_entry *ioa)
  330. {
  331.     static unsigned int io_apic_count = 0;
  332.  
  333.     /* this ioapic is marked unusable */
  334.     if ((ioa->io_apic_flags & 1) == 0)
  335.         return;
  336.    
  337.     if (io_apic_count++ > 0) {
  338.         /*
  339.          * Multiple IO APIC's are currently not supported.
  340.          */
  341.         return;
  342.     }
  343.    
  344.     io_apic = (uint32_t *)(uintptr_t)ioa->io_apic;
  345. }
  346.  
  347. //#define MPSCT_VERBOSE
  348. void ct_io_intr_entry(struct __io_intr_entry *iointr __attribute__((unused)))
  349. {
  350. #ifdef MPSCT_VERBOSE
  351.     switch (iointr->intr_type) {
  352.     case 0:
  353.         printf("INT");
  354.         break;
  355.     case 1:
  356.         printf("NMI");
  357.         break;
  358.     case 2:
  359.         printf("SMI");
  360.         break;
  361.     case 3:
  362.         printf("ExtINT");
  363.         break;
  364.     }
  365.     putchar(',');
  366.     switch (iointr->poel & 3) {
  367.     case 0:
  368.         printf("bus-like");
  369.         break;
  370.     case 1:
  371.         printf("active high");
  372.         break;
  373.     case 2:
  374.         printf("reserved");
  375.         break;
  376.     case 3:
  377.         printf("active low");
  378.         break;
  379.     }
  380.     putchar(',');
  381.     switch ((iointr->poel >> 2) & 3) {
  382.     case 0:
  383.         printf("bus-like");
  384.         break;
  385.     case 1:
  386.         printf("edge-triggered");
  387.         break;
  388.     case 2:
  389.         printf("reserved");
  390.         break;
  391.     case 3:
  392.         printf("level-triggered");
  393.         break;
  394.     }
  395.     putchar(',');
  396.     printf("bus%d,irq%d", iointr->src_bus_id, iointr->src_bus_irq);
  397.     putchar(',');
  398.     printf("io_apic%d,pin%d", iointr->dst_io_apic_id,
  399.         iointr->dst_io_apic_pin);
  400.     putchar('\n'); 
  401. #endif
  402. }
  403.  
  404. void ct_l_intr_entry(struct __l_intr_entry *lintr __attribute__((unused)))
  405. {
  406. #ifdef MPSCT_VERBOSE
  407.     switch (lintr->intr_type) {
  408.     case 0:
  409.         printf("INT");
  410.         break;
  411.     case 1:
  412.         printf("NMI");
  413.         break;
  414.     case 2:
  415.         printf("SMI");
  416.         break;
  417.     case 3:
  418.         printf("ExtINT");
  419.         break;
  420.     }
  421.     putchar(',');
  422.     switch (lintr->poel & 3) {
  423.     case 0:
  424.         printf("bus-like");
  425.         break;
  426.     case 1:
  427.         printf("active high");
  428.         break;
  429.     case 2:
  430.         printf("reserved");
  431.         break;
  432.     case 3:
  433.         printf("active low");
  434.         break;
  435.     }
  436.     putchar(',');
  437.     switch ((lintr->poel >> 2) & 3) {
  438.     case 0:
  439.         printf("bus-like");
  440.         break;
  441.     case 1:
  442.         printf("edge-triggered");
  443.         break;
  444.     case 2:
  445.         printf("reserved");
  446.         break;
  447.     case 3:
  448.         printf("level-triggered");
  449.         break;
  450.     }
  451.     putchar(',');
  452.     printf("bus%d,irq%d", lintr->src_bus_id, lintr->src_bus_irq);
  453.     putchar(',');
  454.     printf("l_apic%d,pin%d", lintr->dst_l_apic_id, lintr->dst_l_apic_pin);
  455.     putchar('\n');
  456. #endif
  457. }
  458.  
  459. void ct_extended_entries(void)
  460. {
  461.     uint8_t *ext = (uint8_t *) ct + ct->base_table_length;
  462.     uint8_t *cur;
  463.  
  464.     for (cur = ext; cur < ext + ct->ext_table_length;
  465.         cur += cur[CT_EXT_ENTRY_LEN]) {
  466.         switch (cur[CT_EXT_ENTRY_TYPE]) {
  467.         default:
  468.             printf("%p: skipping MP Configuration Table extended "
  469.                 "entry type %d\n", cur, cur[CT_EXT_ENTRY_TYPE]);
  470.             break;
  471.         }
  472.     }
  473. }
  474.  
  475. int mps_irq_to_pin(unsigned int irq)
  476. {
  477.     unsigned int i;
  478.    
  479.     for (i = 0; i < io_intr_entry_cnt; i++) {
  480.         if (io_intr_entries[i].src_bus_irq == irq &&
  481.             io_intr_entries[i].intr_type == 0)
  482.             return io_intr_entries[i].dst_io_apic_pin;
  483.     }
  484.    
  485.     return -1;
  486. }
  487.  
  488. #endif /* CONFIG_SMP */
  489.  
  490. /** @}
  491.  */
  492.