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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 <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 count_t get_cpu_count(void);
  90. static bool is_cpu_enabled(index_t i);
  91. static bool is_bsp(index_t i);
  92. static uint8_t get_cpu_apic_id(index_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. count_t get_cpu_count(void)
  104. {
  105.     return processor_entry_cnt;
  106. }
  107.  
  108. bool is_cpu_enabled(index_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(index_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(index_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]) == FS_SIGNATURE && mps_fs_check(&addr[i][j])) {
  182.                 fs = (struct mps_fs *) &addr[i][j];
  183.                 goto fs_found;
  184.             }
  185.         }
  186.     }
  187.  
  188.     return;
  189.    
  190. fs_found:
  191.     printf("%p: MPS Floating Pointer Structure\n", fs);
  192.  
  193.     if (fs->config_type == 0 && fs->configuration_table) {
  194.         if (fs->mpfib2 >> 7) {
  195.             printf("%s: PIC mode not supported\n", __func__);
  196.             return;
  197.         }
  198.  
  199.         ct = (struct mps_ct *)PA2KA((uintptr_t)fs->configuration_table);
  200.         config.cpu_count = configure_via_ct();
  201.     }
  202.     else
  203.         config.cpu_count = configure_via_default(fs->config_type);
  204.  
  205.     return;
  206. }
  207.  
  208. int configure_via_ct(void)
  209. {
  210.     uint8_t *cur;
  211.     unsigned int i, cnt;
  212.        
  213.     if (ct->signature != CT_SIGNATURE) {
  214.         printf("%s: bad ct->signature\n", __func__);
  215.         return 1;
  216.     }
  217.     if (!mps_ct_check()) {
  218.         printf("%s: bad ct checksum\n", __func__);
  219.         return 1;
  220.     }
  221.     if (ct->oem_table) {
  222.         printf("%s: ct->oem_table not supported\n", __func__);
  223.         return 1;
  224.     }
  225.    
  226.     l_apic = (uint32_t *)(uintptr_t)ct->l_apic;
  227.  
  228.     cnt = 0;
  229.     cur = &ct->base_table[0];
  230.     for (i=0; i < ct->entry_count; i++) {
  231.         switch (*cur) {
  232.             /* Processor entry */
  233.             case 0:
  234.                 processor_entries = processor_entries ? processor_entries : (struct __processor_entry *) cur;
  235.                 processor_entry_cnt++;
  236.                 cnt += ct_processor_entry((struct __processor_entry *) cur);
  237.                 cur += 20;
  238.                 break;
  239.  
  240.             /* Bus entry */
  241.             case 1:
  242.                 bus_entries = bus_entries ? bus_entries : (struct __bus_entry *) cur;
  243.                 bus_entry_cnt++;
  244.                 ct_bus_entry((struct __bus_entry *) cur);
  245.                 cur += 8;
  246.                 break;
  247.                
  248.             /* I/O Apic */
  249.             case 2:
  250.                 io_apic_entries = io_apic_entries ? io_apic_entries : (struct __io_apic_entry *) cur;
  251.                 io_apic_entry_cnt++;
  252.                 ct_io_apic_entry((struct __io_apic_entry *) cur);
  253.                 cur += 8;
  254.                 break;
  255.                
  256.             /* I/O Interrupt Assignment */
  257.             case 3:
  258.                 io_intr_entries = io_intr_entries ? io_intr_entries : (struct __io_intr_entry *) cur;
  259.                 io_intr_entry_cnt++;
  260.                 ct_io_intr_entry((struct __io_intr_entry *) cur);
  261.                 cur += 8;
  262.                 break;
  263.  
  264.             /* Local Interrupt Assignment */
  265.             case 4:
  266.                 l_intr_entries = l_intr_entries ? l_intr_entries : (struct __l_intr_entry *) cur;
  267.                 l_intr_entry_cnt++;
  268.                 ct_l_intr_entry((struct __l_intr_entry *) cur);
  269.                 cur += 8;
  270.                 break;
  271.  
  272.             default:
  273.                 /*
  274.                  * Something is wrong. Fallback to UP mode.
  275.                  */
  276.                  
  277.                 printf("%s: ct badness\n", __func__);
  278.                 return 1;
  279.         }
  280.     }
  281.    
  282.     /*
  283.      * Process extended entries.
  284.      */
  285.     ct_extended_entries();
  286.     return cnt;
  287. }
  288.  
  289. int configure_via_default(uint8_t n __attribute__((unused)))
  290. {
  291.     /*
  292.      * Not yet implemented.
  293.      */
  294.     printf("%s: not supported\n", __func__);
  295.     return 1;
  296. }
  297.  
  298.  
  299. int ct_processor_entry(struct __processor_entry *pr __attribute__((unused)))
  300. {
  301.     /*
  302.      * Ignore processors which are not marked enabled.
  303.      */
  304.     if ((pr->cpu_flags & (1<<0)) == 0)
  305.         return 0;
  306.    
  307.     apic_id_mask |= (1<<pr->l_apic_id);
  308.     return 1;
  309. }
  310.  
  311. void ct_bus_entry(struct __bus_entry *bus __attribute__((unused)))
  312. {
  313. #ifdef MPSCT_VERBOSE
  314.     char buf[7];
  315.     memcpy((void *) buf, (void *) bus->bus_type, 6);
  316.     buf[6] = 0;
  317.     printf("bus%d: %s\n", bus->bus_id, buf);
  318. #endif
  319. }
  320.  
  321. void ct_io_apic_entry(struct __io_apic_entry *ioa)
  322. {
  323.     static unsigned int io_apic_count = 0;
  324.  
  325.     /* this ioapic is marked unusable */
  326.     if ((ioa->io_apic_flags & 1) == 0)
  327.         return;
  328.    
  329.     if (io_apic_count++ > 0) {
  330.         /*
  331.          * Multiple IO APIC's are currently not supported.
  332.          */
  333.         return;
  334.     }
  335.    
  336.     io_apic = (uint32_t *)(uintptr_t)ioa->io_apic;
  337. }
  338.  
  339. //#define MPSCT_VERBOSE
  340. void ct_io_intr_entry(struct __io_intr_entry *iointr __attribute__((unused)))
  341. {
  342. #ifdef MPSCT_VERBOSE
  343.     switch (iointr->intr_type) {
  344.         case 0: printf("INT"); break;
  345.         case 1: printf("NMI"); break;
  346.         case 2: printf("SMI"); break;
  347.         case 3: printf("ExtINT"); break;
  348.     }
  349.     putchar(',');
  350.     switch (iointr->poel&3) {
  351.         case 0: printf("bus-like"); break;
  352.         case 1: printf("active high"); break;
  353.         case 2: printf("reserved"); break;
  354.         case 3: printf("active low"); break;
  355.     }
  356.     putchar(',');
  357.     switch ((iointr->poel>>2)&3) {
  358.         case 0: printf("bus-like"); break;
  359.         case 1: printf("edge-triggered"); break;
  360.         case 2: printf("reserved"); break;
  361.         case 3: printf("level-triggered"); break;
  362.     }
  363.     putchar(',');
  364.     printf("bus%d,irq%d", iointr->src_bus_id, iointr->src_bus_irq);
  365.     putchar(',');
  366.     printf("io_apic%d,pin%d", iointr->dst_io_apic_id, iointr->dst_io_apic_pin);
  367.     putchar('\n'); 
  368. #endif
  369. }
  370.  
  371. void ct_l_intr_entry(struct __l_intr_entry *lintr __attribute__((unused)))
  372. {
  373. #ifdef MPSCT_VERBOSE
  374.     switch (lintr->intr_type) {
  375.         case 0: printf("INT"); break;
  376.         case 1: printf("NMI"); break;
  377.         case 2: printf("SMI"); break;
  378.         case 3: printf("ExtINT"); break;
  379.     }
  380.     putchar(',');
  381.     switch (lintr->poel&3) {
  382.         case 0: printf("bus-like"); break;
  383.         case 1: printf("active high"); break;
  384.         case 2: printf("reserved"); break;
  385.         case 3: printf("active low"); break;
  386.     }
  387.     putchar(',');
  388.     switch ((lintr->poel>>2)&3) {
  389.         case 0: printf("bus-like"); break;
  390.         case 1: printf("edge-triggered"); break;
  391.         case 2: printf("reserved"); break;
  392.         case 3: printf("level-triggered"); break;
  393.     }
  394.     putchar(',');
  395.     printf("bus%d,irq%d", lintr->src_bus_id, lintr->src_bus_irq);
  396.     putchar(',');
  397.     printf("l_apic%d,pin%d", lintr->dst_l_apic_id, lintr->dst_l_apic_pin);
  398.     putchar('\n');
  399. #endif
  400. }
  401.  
  402. void ct_extended_entries(void)
  403. {
  404.     uint8_t *ext = (uint8_t *) ct + ct->base_table_length;
  405.     uint8_t *cur;
  406.  
  407.     for (cur = ext; cur < ext + ct->ext_table_length; cur += cur[CT_EXT_ENTRY_LEN]) {
  408.         switch (cur[CT_EXT_ENTRY_TYPE]) {
  409.             default:
  410.                 printf("%p: skipping MP Configuration Table extended entry type %d\n", cur, cur[CT_EXT_ENTRY_TYPE]);
  411.                 break;
  412.         }
  413.     }
  414. }
  415.  
  416. int mps_irq_to_pin(unsigned int irq)
  417. {
  418.     unsigned int i;
  419.    
  420.     for (i = 0; i < io_intr_entry_cnt; i++) {
  421.         if (io_intr_entries[i].src_bus_irq == irq && io_intr_entries[i].intr_type == 0)
  422.             return io_intr_entries[i].dst_io_apic_pin;
  423.     }
  424.    
  425.     return -1;
  426. }
  427.  
  428. #endif /* CONFIG_SMP */
  429.  
  430. /** @}
  431.  */
  432.