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