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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 ia32xen
  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. int mps_fs_check(uint8_t *base);
  58. int mps_ct_check(void);
  59.  
  60. int configure_via_ct(void);
  61. int configure_via_default(uint8_t n);
  62.  
  63. int ct_processor_entry(struct __processor_entry *pr);
  64. void ct_bus_entry(struct __bus_entry *bus);
  65. void ct_io_apic_entry(struct __io_apic_entry *ioa);
  66. void ct_io_intr_entry(struct __io_intr_entry *iointr);
  67. void ct_l_intr_entry(struct __l_intr_entry *lintr);
  68.  
  69. 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. int processor_entry_cnt = 0;
  81. int bus_entry_cnt = 0;
  82. int io_apic_entry_cnt = 0;
  83. int io_intr_entry_cnt = 0;
  84. int l_intr_entry_cnt = 0;
  85.  
  86. waitq_t ap_completion_wq;
  87.  
  88. /*
  89.  * Implementation of IA-32 SMP configuration interface.
  90.  */
  91. static count_t get_cpu_count(void);
  92. static bool is_cpu_enabled(index_t i);
  93. static bool is_bsp(index_t i);
  94. static uint8_t get_cpu_apic_id(index_t i);
  95. static int mps_irq_to_pin(unsigned int irq);
  96.  
  97. struct smp_config_operations mps_config_operations = {
  98.     .cpu_count = get_cpu_count,
  99.     .cpu_enabled = is_cpu_enabled,
  100.     .cpu_bootstrap = is_bsp,
  101.     .cpu_apic_id = get_cpu_apic_id,
  102.     .irq_to_pin = mps_irq_to_pin
  103. };
  104.  
  105. count_t get_cpu_count(void)
  106. {
  107.     return processor_entry_cnt;
  108. }
  109.  
  110. bool is_cpu_enabled(index_t i)
  111. {
  112.     ASSERT(i < processor_entry_cnt);
  113.     return processor_entries[i].cpu_flags & 0x1;
  114. }
  115.  
  116. bool is_bsp(index_t i)
  117. {
  118.     ASSERT(i < processor_entry_cnt);
  119.     return processor_entries[i].cpu_flags & 0x2;
  120. }
  121.  
  122. uint8_t get_cpu_apic_id(index_t i)
  123. {
  124.     ASSERT(i < processor_entry_cnt);
  125.     return processor_entries[i].l_apic_id;
  126. }
  127.  
  128.  
  129. /*
  130.  * Used to check the integrity of the MP Floating Structure.
  131.  */
  132. int mps_fs_check(uint8_t *base)
  133. {
  134.     int i;
  135.     uint8_t sum;
  136.    
  137.     for (i = 0, sum = 0; i < 16; i++)
  138.         sum += base[i];
  139.    
  140.     return !sum;
  141. }
  142.  
  143. /*
  144.  * Used to check the integrity of the MP Configuration Table.
  145.  */
  146. int mps_ct_check(void)
  147. {
  148.     uint8_t *base = (uint8_t *) ct;
  149.     uint8_t *ext = base + ct->base_table_length;
  150.     uint8_t sum;
  151.     int i; 
  152.    
  153.     /* count the checksum for the base table */
  154.     for (i=0,sum=0; i < ct->base_table_length; i++)
  155.         sum += base[i];
  156.        
  157.     if (sum)
  158.         return 0;
  159.        
  160.     /* count the checksum for the extended table */
  161.     for (i=0,sum=0; i < ct->ext_table_length; i++)
  162.         sum += ext[i];
  163.        
  164.     return sum == ct->ext_table_checksum;
  165. }
  166.  
  167. void mps_init(void)
  168. {
  169.     uint8_t *addr[2] = { NULL, (uint8_t *) PA2KA(0xf0000) };
  170.     int i, j, length[2] = { 1024, 64*1024 };
  171.    
  172.  
  173.     /*
  174.      * Find MP Floating Pointer Structure
  175.      * 1a. search first 1K of EBDA
  176.      * 1b. if EBDA is undefined, search last 1K of base memory
  177.      *  2. search 64K starting at 0xf0000
  178.      */
  179.  
  180.     addr[0] = (uint8_t *) PA2KA(ebda ? ebda : 639 * 1024);
  181.     for (i = 0; i < 2; i++) {
  182.         for (j = 0; j < length[i]; j += 16) {
  183.             if (*((uint32_t *) &addr[i][j]) == FS_SIGNATURE && mps_fs_check(&addr[i][j])) {
  184.                 fs = (struct mps_fs *) &addr[i][j];
  185.                 goto fs_found;
  186.             }
  187.         }
  188.     }
  189.  
  190.     return;
  191.    
  192. fs_found:
  193.     printf("%p: MPS Floating Pointer Structure\n", fs);
  194.  
  195.     if (fs->config_type == 0 && fs->configuration_table) {
  196.         if (fs->mpfib2 >> 7) {
  197.             printf("%s: PIC mode not supported\n", __func__);
  198.             return;
  199.         }
  200.  
  201.         ct = (struct mps_ct *)PA2KA((uintptr_t)fs->configuration_table);
  202.         config.cpu_count = configure_via_ct();
  203.     }
  204.     else
  205.         config.cpu_count = configure_via_default(fs->config_type);
  206.  
  207.     return;
  208. }
  209.  
  210. int configure_via_ct(void)
  211. {
  212.     uint8_t *cur;
  213.     int i, cnt;
  214.        
  215.     if (ct->signature != CT_SIGNATURE) {
  216.         printf("%s: bad ct->signature\n", __func__);
  217.         return 1;
  218.     }
  219.     if (!mps_ct_check()) {
  220.         printf("%s: bad ct checksum\n", __func__);
  221.         return 1;
  222.     }
  223.     if (ct->oem_table) {
  224.         printf("%s: ct->oem_table not supported\n", __func__);
  225.         return 1;
  226.     }
  227.    
  228.     l_apic = (uint32_t *)(uintptr_t)ct->l_apic;
  229.  
  230.     cnt = 0;
  231.     cur = &ct->base_table[0];
  232.     for (i=0; i < ct->entry_count; i++) {
  233.         switch (*cur) {
  234.             /* Processor entry */
  235.             case 0:
  236.                 processor_entries = processor_entries ? processor_entries : (struct __processor_entry *) cur;
  237.                 processor_entry_cnt++;
  238.                 cnt += ct_processor_entry((struct __processor_entry *) cur);
  239.                 cur += 20;
  240.                 break;
  241.  
  242.             /* Bus entry */
  243.             case 1:
  244.                 bus_entries = bus_entries ? bus_entries : (struct __bus_entry *) cur;
  245.                 bus_entry_cnt++;
  246.                 ct_bus_entry((struct __bus_entry *) cur);
  247.                 cur += 8;
  248.                 break;
  249.                
  250.             /* I/O Apic */
  251.             case 2:
  252.                 io_apic_entries = io_apic_entries ? io_apic_entries : (struct __io_apic_entry *) cur;
  253.                 io_apic_entry_cnt++;
  254.                 ct_io_apic_entry((struct __io_apic_entry *) cur);
  255.                 cur += 8;
  256.                 break;
  257.                
  258.             /* I/O Interrupt Assignment */
  259.             case 3:
  260.                 io_intr_entries = io_intr_entries ? io_intr_entries : (struct __io_intr_entry *) cur;
  261.                 io_intr_entry_cnt++;
  262.                 ct_io_intr_entry((struct __io_intr_entry *) cur);
  263.                 cur += 8;
  264.                 break;
  265.  
  266.             /* Local Interrupt Assignment */
  267.             case 4:
  268.                 l_intr_entries = l_intr_entries ? l_intr_entries : (struct __l_intr_entry *) cur;
  269.                 l_intr_entry_cnt++;
  270.                 ct_l_intr_entry((struct __l_intr_entry *) cur);
  271.                 cur += 8;
  272.                 break;
  273.  
  274.             default:
  275.                 /*
  276.                  * Something is wrong. Fallback to UP mode.
  277.                  */
  278.                  
  279.                 printf("%s: ct badness\n", __func__);
  280.                 return 1;
  281.         }
  282.     }
  283.    
  284.     /*
  285.      * Process extended entries.
  286.      */
  287.     ct_extended_entries();
  288.     return cnt;
  289. }
  290.  
  291. int configure_via_default(uint8_t n)
  292. {
  293.     /*
  294.      * Not yet implemented.
  295.      */
  296.     printf("%s: not supported\n", __func__);
  297.     return 1;
  298. }
  299.  
  300.  
  301. int ct_processor_entry(struct __processor_entry *pr)
  302. {
  303.     /*
  304.      * Ignore processors which are not marked enabled.
  305.      */
  306.     if ((pr->cpu_flags & (1<<0)) == 0)
  307.         return 0;
  308.    
  309.     apic_id_mask |= (1<<pr->l_apic_id);
  310.     return 1;
  311. }
  312.  
  313. void ct_bus_entry(struct __bus_entry *bus)
  314. {
  315. #ifdef MPSCT_VERBOSE
  316.     char buf[7];
  317.     memcpy((void *) buf, (void *) bus->bus_type, 6);
  318.     buf[6] = 0;
  319.     printf("bus%d: %s\n", bus->bus_id, buf);
  320. #endif
  321. }
  322.  
  323. void ct_io_apic_entry(struct __io_apic_entry *ioa)
  324. {
  325.     static int io_apic_count = 0;
  326.  
  327.     /* this ioapic is marked unusable */
  328.     if ((ioa->io_apic_flags & 1) == 0)
  329.         return;
  330.    
  331.     if (io_apic_count++ > 0) {
  332.         /*
  333.          * Multiple IO APIC's are currently not supported.
  334.          */
  335.         return;
  336.     }
  337.    
  338.     io_apic = (uint32_t *)(uintptr_t)ioa->io_apic;
  339. }
  340.  
  341. //#define MPSCT_VERBOSE
  342. void ct_io_intr_entry(struct __io_intr_entry *iointr)
  343. {
  344. #ifdef MPSCT_VERBOSE
  345.     switch (iointr->intr_type) {
  346.         case 0: printf("INT"); break;
  347.         case 1: printf("NMI"); break;
  348.         case 2: printf("SMI"); break;
  349.         case 3: printf("ExtINT"); break;
  350.     }
  351.     putchar(',');
  352.     switch (iointr->poel&3) {
  353.         case 0: printf("bus-like"); break;
  354.         case 1: printf("active high"); break;
  355.         case 2: printf("reserved"); break;
  356.         case 3: printf("active low"); break;
  357.     }
  358.     putchar(',');
  359.     switch ((iointr->poel>>2)&3) {
  360.         case 0: printf("bus-like"); break;
  361.         case 1: printf("edge-triggered"); break;
  362.         case 2: printf("reserved"); break;
  363.         case 3: printf("level-triggered"); break;
  364.     }
  365.     putchar(',');
  366.     printf("bus%d,irq%d", iointr->src_bus_id, iointr->src_bus_irq);
  367.     putchar(',');
  368.     printf("io_apic%d,pin%d", iointr->dst_io_apic_id, iointr->dst_io_apic_pin);
  369.     putchar('\n'); 
  370. #endif
  371. }
  372.  
  373. void ct_l_intr_entry(struct __l_intr_entry *lintr)
  374. {
  375. #ifdef MPSCT_VERBOSE
  376.     switch (lintr->intr_type) {
  377.         case 0: printf("INT"); break;
  378.         case 1: printf("NMI"); break;
  379.         case 2: printf("SMI"); break;
  380.         case 3: printf("ExtINT"); break;
  381.     }
  382.     putchar(',');
  383.     switch (lintr->poel&3) {
  384.         case 0: printf("bus-like"); break;
  385.         case 1: printf("active high"); break;
  386.         case 2: printf("reserved"); break;
  387.         case 3: printf("active low"); break;
  388.     }
  389.     putchar(',');
  390.     switch ((lintr->poel>>2)&3) {
  391.         case 0: printf("bus-like"); break;
  392.         case 1: printf("edge-triggered"); break;
  393.         case 2: printf("reserved"); break;
  394.         case 3: printf("level-triggered"); break;
  395.     }
  396.     putchar(',');
  397.     printf("bus%d,irq%d", lintr->src_bus_id, lintr->src_bus_irq);
  398.     putchar(',');
  399.     printf("l_apic%d,pin%d", lintr->dst_l_apic_id, lintr->dst_l_apic_pin);
  400.     putchar('\n');
  401. #endif
  402. }
  403.  
  404. void ct_extended_entries(void)
  405. {
  406.     uint8_t *ext = (uint8_t *) ct + ct->base_table_length;
  407.     uint8_t *cur;
  408.  
  409.     for (cur = ext; cur < ext + ct->ext_table_length; cur += cur[CT_EXT_ENTRY_LEN]) {
  410.         switch (cur[CT_EXT_ENTRY_TYPE]) {
  411.             default:
  412.                 printf("%p: skipping MP Configuration Table extended entry type %d\n", cur, cur[CT_EXT_ENTRY_TYPE]);
  413.                 break;
  414.         }
  415.     }
  416. }
  417.  
  418. int mps_irq_to_pin(unsigned int irq)
  419. {
  420.     int i;
  421.    
  422.     for (i = 0; i < io_intr_entry_cnt; i++) {
  423.         if (io_intr_entries[i].src_bus_irq == irq && io_intr_entries[i].intr_type == 0)
  424.             return io_intr_entries[i].dst_io_apic_pin;
  425.     }
  426.    
  427.     return -1;
  428. }
  429.  
  430. #endif /* CONFIG_SMP */
  431.  
  432. /** @}
  433.  */
  434.