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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. #ifdef CONFIG_SMP
  30.  
  31. #include <config.h>
  32. #include <print.h>
  33. #include <debug.h>
  34. #include <arch/smp/mps.h>
  35. #include <arch/smp/apic.h>
  36. #include <arch/smp/smp.h>
  37. #include <func.h>
  38. #include <arch/types.h>
  39. #include <typedefs.h>
  40. #include <cpu.h>
  41. #include <arch/asm.h>
  42. #include <arch/bios/bios.h>
  43. #include <mm/frame.h>
  44.  
  45. /*
  46.  * MultiProcessor Specification detection code.
  47.  */
  48.  
  49. #define FS_SIGNATURE    0x5f504d5f
  50. #define CT_SIGNATURE    0x504d4350
  51.  
  52. int mps_fs_check(__u8 *base);
  53. int mps_ct_check(void);
  54.  
  55. int configure_via_ct(void);
  56. int configure_via_default(__u8 n);
  57.  
  58. int ct_processor_entry(struct __processor_entry *pr);
  59. void ct_bus_entry(struct __bus_entry *bus);
  60. void ct_io_apic_entry(struct __io_apic_entry *ioa);
  61. void ct_io_intr_entry(struct __io_intr_entry *iointr);
  62. void ct_l_intr_entry(struct __l_intr_entry *lintr);
  63.  
  64. void ct_extended_entries(void);
  65.  
  66. static struct mps_fs *fs;
  67. static struct mps_ct *ct;
  68.  
  69. struct __processor_entry *processor_entries = NULL;
  70. struct __bus_entry *bus_entries = NULL;
  71. struct __io_apic_entry *io_apic_entries = NULL;
  72. struct __io_intr_entry *io_intr_entries = NULL;
  73. struct __l_intr_entry *l_intr_entries = NULL;
  74.  
  75. int processor_entry_cnt = 0;
  76. int bus_entry_cnt = 0;
  77. int io_apic_entry_cnt = 0;
  78. int io_intr_entry_cnt = 0;
  79. int l_intr_entry_cnt = 0;
  80.  
  81. waitq_t ap_completion_wq;
  82. waitq_t kmp_completion_wq;
  83.  
  84.  
  85. /*
  86.  * Implementation of IA-32 SMP configuration interface.
  87.  */
  88. static count_t get_cpu_count(void);
  89. static bool is_cpu_enabled(index_t i);
  90. static bool is_bsp(index_t i);
  91. static __u8 get_cpu_apic_id(index_t i);
  92. static int mps_irq_to_pin(int irq);
  93.  
  94. struct smp_config_operations mps_config_operations = {
  95.     .cpu_count = get_cpu_count,
  96.     .cpu_enabled = is_cpu_enabled,
  97.     .cpu_bootstrap = is_bsp,
  98.     .cpu_apic_id = get_cpu_apic_id,
  99.     .irq_to_pin = mps_irq_to_pin
  100. };
  101.  
  102. count_t get_cpu_count(void)
  103. {
  104.     return processor_entry_cnt;
  105. }
  106.  
  107. bool is_cpu_enabled(index_t i)
  108. {
  109.     ASSERT(i < processor_entry_cnt);
  110.     return processor_entries[i].cpu_flags & 0x1;
  111. }
  112.  
  113. bool is_bsp(index_t i)
  114. {
  115.     ASSERT(i < processor_entry_cnt);
  116.     return processor_entries[i].cpu_flags & 0x2;
  117. }
  118.  
  119. __u8 get_cpu_apic_id(index_t i)
  120. {
  121.     ASSERT(i < processor_entry_cnt);
  122.     return processor_entries[i].l_apic_id;
  123. }
  124.  
  125.  
  126. /*
  127.  * Used to check the integrity of the MP Floating Structure.
  128.  */
  129. int mps_fs_check(__u8 *base)
  130. {
  131.     int i;
  132.     __u8 sum;
  133.    
  134.     for (i = 0, sum = 0; i < 16; i++)
  135.         sum += base[i];
  136.    
  137.     return !sum;
  138. }
  139.  
  140. /*
  141.  * Used to check the integrity of the MP Configuration Table.
  142.  */
  143. int mps_ct_check(void)
  144. {
  145.     __u8 *base = (__u8 *) ct;
  146.     __u8 *ext = base + ct->base_table_length;
  147.     __u8 sum;
  148.     int i; 
  149.    
  150.     /* count the checksum for the base table */
  151.     for (i=0,sum=0; i < ct->base_table_length; i++)
  152.         sum += base[i];
  153.        
  154.     if (sum)
  155.         return 0;
  156.        
  157.     /* count the checksum for the extended table */
  158.     for (i=0,sum=0; i < ct->ext_table_length; i++)
  159.         sum += ext[i];
  160.        
  161.     return sum == ct->ext_table_checksum;
  162. }
  163.  
  164. void mps_init(void)
  165. {
  166.     __u8 *addr[2] = { NULL, (__u8 *) PA2KA(0xf0000) };
  167.     int i, j, length[2] = { 1024, 64*1024 };
  168.    
  169.  
  170.     /*
  171.      * Find MP Floating Pointer Structure
  172.      * 1a. search first 1K of EBDA
  173.      * 1b. if EBDA is undefined, search last 1K of base memory
  174.      *  2. search 64K starting at 0xf0000
  175.      */
  176.  
  177.     addr[0] = (__u8 *) PA2KA(ebda ? ebda : 639 * 1024);
  178.     for (i = 0; i < 2; i++) {
  179.         for (j = 0; j < length[i]; j += 16) {
  180.             if (*((__u32 *) &addr[i][j]) == FS_SIGNATURE && mps_fs_check(&addr[i][j])) {
  181.                 fs = (struct mps_fs *) &addr[i][j];
  182.                 goto fs_found;
  183.             }
  184.         }
  185.     }
  186.  
  187.     return;
  188.    
  189. fs_found:
  190.     printf("%P: MPS Floating Pointer Structure\n", fs);
  191.  
  192.     if (fs->config_type == 0 && fs->configuration_table) {
  193.         if (fs->mpfib2 >> 7) {
  194.             printf("%s: PIC mode not supported\n", __FUNCTION__);
  195.             return;
  196.         }
  197.  
  198.         ct = (struct mps_ct *)PA2KA((__address)fs->configuration_table);
  199.         config.cpu_count = configure_via_ct();
  200.     }
  201.     else
  202.         config.cpu_count = configure_via_default(fs->config_type);
  203.  
  204.     return;
  205. }
  206.  
  207. int configure_via_ct(void)
  208. {
  209.     __u8 *cur;
  210.     int i, cnt;
  211.        
  212.     if (ct->signature != CT_SIGNATURE) {
  213.         printf("%s: bad ct->signature\n", __FUNCTION__);
  214.         return 1;
  215.     }
  216.     if (!mps_ct_check()) {
  217.         printf("%s: bad ct checksum\n", __FUNCTION__);
  218.         return 1;
  219.     }
  220.     if (ct->oem_table) {
  221.         printf("%s: ct->oem_table not supported\n", __FUNCTION__);
  222.         return 1;
  223.     }
  224.    
  225.     l_apic = (__u32 *)(__address)ct->l_apic;
  226.  
  227.     cnt = 0;
  228.     cur = &ct->base_table[0];
  229.     for (i=0; i < ct->entry_count; i++) {
  230.         switch (*cur) {
  231.             /* Processor entry */
  232.             case 0:
  233.                 processor_entries = processor_entries ? processor_entries : (struct __processor_entry *) cur;
  234.                 processor_entry_cnt++;
  235.                 cnt += ct_processor_entry((struct __processor_entry *) cur);
  236.                 cur += 20;
  237.                 break;
  238.  
  239.             /* Bus entry */
  240.             case 1:
  241.                 bus_entries = bus_entries ? bus_entries : (struct __bus_entry *) cur;
  242.                 bus_entry_cnt++;
  243.                 ct_bus_entry((struct __bus_entry *) cur);
  244.                 cur += 8;
  245.                 break;
  246.                
  247.             /* I/O Apic */
  248.             case 2:
  249.                 io_apic_entries = io_apic_entries ? io_apic_entries : (struct __io_apic_entry *) cur;
  250.                 io_apic_entry_cnt++;
  251.                 ct_io_apic_entry((struct __io_apic_entry *) cur);
  252.                 cur += 8;
  253.                 break;
  254.                
  255.             /* I/O Interrupt Assignment */
  256.             case 3:
  257.                 io_intr_entries = io_intr_entries ? io_intr_entries : (struct __io_intr_entry *) cur;
  258.                 io_intr_entry_cnt++;
  259.                 ct_io_intr_entry((struct __io_intr_entry *) cur);
  260.                 cur += 8;
  261.                 break;
  262.  
  263.             /* Local Interrupt Assignment */
  264.             case 4:
  265.                 l_intr_entries = l_intr_entries ? l_intr_entries : (struct __l_intr_entry *) cur;
  266.                 l_intr_entry_cnt++;
  267.                 ct_l_intr_entry((struct __l_intr_entry *) cur);
  268.                 cur += 8;
  269.                 break;
  270.  
  271.             default:
  272.                 /*
  273.                  * Something is wrong. Fallback to UP mode.
  274.                  */
  275.                  
  276.                 printf("%s: ct badness\n", __FUNCTION__);
  277.                 return 1;
  278.         }
  279.     }
  280.    
  281.     /*
  282.      * Process extended entries.
  283.      */
  284.     ct_extended_entries();
  285.     return cnt;
  286. }
  287.  
  288. int configure_via_default(__u8 n)
  289. {
  290.     /*
  291.      * Not yet implemented.
  292.      */
  293.     printf("%s: not supported\n", __FUNCTION__);
  294.     return 1;
  295. }
  296.  
  297.  
  298. int ct_processor_entry(struct __processor_entry *pr)
  299. {
  300.     /*
  301.      * Ignore processors which are not marked enabled.
  302.      */
  303.     if ((pr->cpu_flags & (1<<0)) == 0)
  304.         return 0;
  305.    
  306.     apic_id_mask |= (1<<pr->l_apic_id);
  307.     return 1;
  308. }
  309.  
  310. void ct_bus_entry(struct __bus_entry *bus)
  311. {
  312. #ifdef MPSCT_VERBOSE
  313.     char buf[7];
  314.     memcpy((void *) buf, (void *) bus->bus_type, 6);
  315.     buf[6] = 0;
  316.     printf("bus%d: %s\n", bus->bus_id, buf);
  317. #endif
  318. }
  319.  
  320. void ct_io_apic_entry(struct __io_apic_entry *ioa)
  321. {
  322.     static int io_apic_count = 0;
  323.  
  324.     /* this ioapic is marked unusable */
  325.     if (ioa->io_apic_flags & 1 == 0)
  326.         return;
  327.    
  328.     if (io_apic_count++ > 0) {
  329.         /*
  330.          * Multiple IO APIC's are currently not supported.
  331.          */
  332.         return;
  333.     }
  334.    
  335.     io_apic = (__u32 *)(__address)ioa->io_apic;
  336. }
  337.  
  338. //#define MPSCT_VERBOSE
  339. void ct_io_intr_entry(struct __io_intr_entry *iointr)
  340. {
  341. #ifdef MPSCT_VERBOSE
  342.     switch (iointr->intr_type) {
  343.         case 0: printf("INT"); break;
  344.         case 1: printf("NMI"); break;
  345.         case 2: printf("SMI"); break;
  346.         case 3: printf("ExtINT"); break;
  347.     }
  348.     putchar(',');
  349.     switch (iointr->poel&3) {
  350.         case 0: printf("bus-like"); break;
  351.         case 1: printf("active high"); break;
  352.         case 2: printf("reserved"); break;
  353.         case 3: printf("active low"); break;
  354.     }
  355.     putchar(',');
  356.     switch ((iointr->poel>>2)&3) {
  357.         case 0: printf("bus-like"); break;
  358.         case 1: printf("edge-triggered"); break;
  359.         case 2: printf("reserved"); break;
  360.         case 3: printf("level-triggered"); break;
  361.     }
  362.     putchar(',');
  363.     printf("bus%d,irq%d", iointr->src_bus_id, iointr->src_bus_irq);
  364.     putchar(',');
  365.     printf("io_apic%d,pin%d", iointr->dst_io_apic_id, iointr->dst_io_apic_pin);
  366.     putchar('\n'); 
  367. #endif
  368. }
  369.  
  370. void ct_l_intr_entry(struct __l_intr_entry *lintr)
  371. {
  372. #ifdef MPSCT_VERBOSE
  373.     switch (lintr->intr_type) {
  374.         case 0: printf("INT"); break;
  375.         case 1: printf("NMI"); break;
  376.         case 2: printf("SMI"); break;
  377.         case 3: printf("ExtINT"); break;
  378.     }
  379.     putchar(',');
  380.     switch (lintr->poel&3) {
  381.         case 0: printf("bus-like"); break;
  382.         case 1: printf("active high"); break;
  383.         case 2: printf("reserved"); break;
  384.         case 3: printf("active low"); break;
  385.     }
  386.     putchar(',');
  387.     switch ((lintr->poel>>2)&3) {
  388.         case 0: printf("bus-like"); break;
  389.         case 1: printf("edge-triggered"); break;
  390.         case 2: printf("reserved"); break;
  391.         case 3: printf("level-triggered"); break;
  392.     }
  393.     putchar(',');
  394.     printf("bus%d,irq%d", lintr->src_bus_id, lintr->src_bus_irq);
  395.     putchar(',');
  396.     printf("l_apic%d,pin%d", lintr->dst_l_apic_id, lintr->dst_l_apic_pin);
  397.     putchar('\n');
  398. #endif
  399. }
  400.  
  401. void ct_extended_entries(void)
  402. {
  403.     __u8 *ext = (__u8 *) ct + ct->base_table_length;
  404.     __u8 *cur;
  405.  
  406.     for (cur = ext; cur < ext + ct->ext_table_length; cur += cur[CT_EXT_ENTRY_LEN]) {
  407.         switch (cur[CT_EXT_ENTRY_TYPE]) {
  408.             default:
  409.                 printf("%P: skipping MP Configuration Table extended entry type %d\n", cur, cur[CT_EXT_ENTRY_TYPE]);
  410.                 break;
  411.         }
  412.     }
  413. }
  414.  
  415. int mps_irq_to_pin(int irq)
  416. {
  417.     int i;
  418.    
  419.     for(i=0;i<io_intr_entry_cnt;i++) {
  420.         if (io_intr_entries[i].src_bus_irq == irq && io_intr_entries[i].intr_type == 0)
  421.             return io_intr_entries[i].dst_io_apic_pin;
  422.     }
  423.    
  424.     return -1;
  425. }
  426.  
  427. #endif /* CONFIG_SMP */
  428.