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  1. /*
  2.  * Copyright (c) 2001-2004 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. #include <arch/types.h>
  36. #include <arch/smp/apic.h>
  37. #include <arch/smp/ap.h>
  38. #include <arch/smp/mps.h>
  39. #include <arch/boot/boot.h>
  40. #include <mm/page.h>
  41. #include <time/delay.h>
  42. #include <interrupt.h>
  43. #include <arch/interrupt.h>
  44. #include <print.h>
  45. #include <arch/asm.h>
  46. #include <arch.h>
  47. #include <ddi/irq.h>
  48. #include <ddi/device.h>
  49.  
  50. #ifdef CONFIG_SMP
  51.  
  52. /*
  53.  * Advanced Programmable Interrupt Controller for SMP systems.
  54.  * Tested on:
  55.  *  Bochs 2.0.2 - Bochs 2.2.6 with 2-8 CPUs
  56.  *  Simics 2.0.28 - Simics 2.2.19 2-15 CPUs
  57.  *  VMware Workstation 5.5 with 2 CPUs
  58.  *  QEMU 0.8.0 with 2-15 CPUs
  59.  *  ASUS P/I-P65UP5 + ASUS C-P55T2D REV. 1.41 with 2x 200Mhz Pentium CPUs
  60.  *  ASUS PCH-DL with 2x 3000Mhz Pentium 4 Xeon (HT) CPUs
  61.  *  MSI K7D Master-L with 2x 2100MHz Athlon MP CPUs
  62.  */
  63.  
  64. /*
  65.  * These variables either stay configured as initilalized, or are changed by
  66.  * the MP configuration code.
  67.  *
  68.  * Pay special attention to the volatile keyword. Without it, gcc -O2 would
  69.  * optimize the code too much and accesses to l_apic and io_apic, that must
  70.  * always be 32-bit, would use byte oriented instructions.
  71.  */
  72. volatile uint32_t *l_apic = (uint32_t *) 0xfee00000;
  73. volatile uint32_t *io_apic = (uint32_t *) 0xfec00000;
  74.  
  75. uint32_t apic_id_mask = 0;
  76. static irq_t l_apic_timer_irq;
  77.  
  78. static int apic_poll_errors(void);
  79.  
  80. #ifdef LAPIC_VERBOSE
  81. static char *delmod_str[] = {
  82.     "Fixed",
  83.     "Lowest Priority",
  84.     "SMI",
  85.     "Reserved",
  86.     "NMI",
  87.     "INIT",
  88.     "STARTUP",
  89.     "ExtInt"
  90. };
  91.  
  92. static char *destmod_str[] = {
  93.     "Physical",
  94.     "Logical"
  95. };
  96.  
  97. static char *trigmod_str[] = {
  98.     "Edge",
  99.     "Level"
  100. };
  101.  
  102. static char *mask_str[] = {
  103.     "Unmasked",
  104.     "Masked"
  105. };
  106.  
  107. static char *delivs_str[] = {
  108.     "Idle",
  109.     "Send Pending"
  110. };
  111.  
  112. static char *tm_mode_str[] = {
  113.     "One-shot",
  114.     "Periodic"
  115. };
  116.  
  117. static char *intpol_str[] = {
  118.     "Polarity High",
  119.     "Polarity Low"
  120. };
  121. #endif /* LAPIC_VERBOSE */
  122.  
  123. /** APIC spurious interrupt handler.
  124.  *
  125.  * @param n Interrupt vector.
  126.  * @param istate Interrupted state.
  127.  */
  128. static void apic_spurious(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))
  129. {
  130. #ifdef CONFIG_DEBUG
  131.     printf("cpu%u: APIC spurious interrupt\n", CPU->id);
  132. #endif
  133. }
  134.  
  135. static irq_ownership_t l_apic_timer_claim(void)
  136. {
  137.     return IRQ_ACCEPT;
  138. }
  139.  
  140. static void l_apic_timer_irq_handler(irq_t *irq, void *arg __attribute__((unused)), ...)
  141. {
  142.     /*
  143.      * Holding a spinlock could prevent clock() from preempting
  144.      * the current thread. In this case, we don't need to hold the
  145.      * irq->lock so we just unlock it and then lock it again.
  146.      */
  147.     spinlock_unlock(&irq->lock);
  148.     clock();
  149.     spinlock_lock(&irq->lock);
  150. }
  151.  
  152. /** Initialize APIC on BSP. */
  153. void apic_init(void)
  154. {
  155.     io_apic_id_t idreg;
  156.    
  157.     exc_register(VECTOR_APIC_SPUR, "apic_spurious", (iroutine) apic_spurious);
  158.  
  159.     enable_irqs_function = io_apic_enable_irqs;
  160.     disable_irqs_function = io_apic_disable_irqs;
  161.     eoi_function = l_apic_eoi;
  162.    
  163.     /*
  164.      * Configure interrupt routing.
  165.      * IRQ 0 remains masked as the time signal is generated by l_apic's themselves.
  166.      * Other interrupts will be forwarded to the lowest priority CPU.
  167.      */
  168.     io_apic_disable_irqs(0xffff);
  169.    
  170.     irq_initialize(&l_apic_timer_irq);
  171.     l_apic_timer_irq.preack = true;
  172.     l_apic_timer_irq.devno = device_assign_devno();
  173.     l_apic_timer_irq.inr = IRQ_CLK;
  174.     l_apic_timer_irq.claim = l_apic_timer_claim;
  175.     l_apic_timer_irq.handler = l_apic_timer_irq_handler;
  176.     irq_register(&l_apic_timer_irq);
  177.    
  178.     uint8_t i;
  179.     for (i = 0; i < IRQ_COUNT; i++) {
  180.         int pin;
  181.    
  182.         if ((pin = smp_irq_to_pin(i)) != -1)
  183.             io_apic_change_ioredtbl((uint8_t) pin, DEST_ALL, (uint8_t) (IVT_IRQBASE + i), LOPRI);
  184.     }
  185.    
  186.     /*
  187.      * Ensure that io_apic has unique ID.
  188.      */
  189.     idreg.value = io_apic_read(IOAPICID);
  190.     if ((1 << idreg.apic_id) & apic_id_mask) {  /* see if IO APIC ID is used already */
  191.         for (i = 0; i < APIC_ID_COUNT; i++) {
  192.             if (!((1 << i) & apic_id_mask)) {
  193.                 idreg.apic_id = i;
  194.                 io_apic_write(IOAPICID, idreg.value);
  195.                 break;
  196.             }
  197.         }
  198.     }
  199.  
  200.     /*
  201.      * Configure the BSP's lapic.
  202.      */
  203.     l_apic_init();
  204.  
  205.     l_apic_debug();
  206. }
  207.  
  208. /** Poll for APIC errors.
  209.  *
  210.  * Examine Error Status Register and report all errors found.
  211.  *
  212.  * @return 0 on error, 1 on success.
  213.  */
  214. int apic_poll_errors(void)
  215. {
  216.     esr_t esr;
  217.    
  218.     esr.value = l_apic[ESR];
  219.    
  220.     if (esr.send_checksum_error)
  221.         printf("Send Checksum Error\n");
  222.     if (esr.receive_checksum_error)
  223.         printf("Receive Checksum Error\n");
  224.     if (esr.send_accept_error)
  225.         printf("Send Accept Error\n");
  226.     if (esr.receive_accept_error)
  227.         printf("Receive Accept Error\n");
  228.     if (esr.send_illegal_vector)
  229.         printf("Send Illegal Vector\n");
  230.     if (esr.received_illegal_vector)
  231.         printf("Received Illegal Vector\n");
  232.     if (esr.illegal_register_address)
  233.         printf("Illegal Register Address\n");
  234.  
  235.     return !esr.err_bitmap;
  236. }
  237.  
  238. /** Send all CPUs excluding CPU IPI vector.
  239.  *
  240.  * @param vector Interrupt vector to be sent.
  241.  *
  242.  * @return 0 on failure, 1 on success.
  243.  */
  244. int l_apic_broadcast_custom_ipi(uint8_t vector)
  245. {
  246.     icr_t icr;
  247.  
  248.     icr.lo = l_apic[ICRlo];
  249.     icr.delmod = DELMOD_FIXED;
  250.     icr.destmod = DESTMOD_LOGIC;
  251.     icr.level = LEVEL_ASSERT;
  252.     icr.shorthand = SHORTHAND_ALL_EXCL;
  253.     icr.trigger_mode = TRIGMOD_LEVEL;
  254.     icr.vector = vector;
  255.  
  256.     l_apic[ICRlo] = icr.lo;
  257.  
  258.     icr.lo = l_apic[ICRlo];
  259.     if (icr.delivs == DELIVS_PENDING) {
  260. #ifdef CONFIG_DEBUG
  261.         printf("IPI is pending.\n");
  262. #endif
  263.     }
  264.  
  265.     return apic_poll_errors();
  266. }
  267.  
  268. /** Universal Start-up Algorithm for bringing up the AP processors.
  269.  *
  270.  * @param apicid APIC ID of the processor to be brought up.
  271.  *
  272.  * @return 0 on failure, 1 on success.
  273.  */
  274. int l_apic_send_init_ipi(uint8_t apicid)
  275. {
  276.     icr_t icr;
  277.     int i;
  278.  
  279.     /*
  280.      * Read the ICR register in and zero all non-reserved fields.
  281.      */
  282.     icr.lo = l_apic[ICRlo];
  283.     icr.hi = l_apic[ICRhi];
  284.    
  285.     icr.delmod = DELMOD_INIT;
  286.     icr.destmod = DESTMOD_PHYS;
  287.     icr.level = LEVEL_ASSERT;
  288.     icr.trigger_mode = TRIGMOD_LEVEL;
  289.     icr.shorthand = SHORTHAND_NONE;
  290.     icr.vector = 0;
  291.     icr.dest = apicid;
  292.    
  293.     l_apic[ICRhi] = icr.hi;
  294.     l_apic[ICRlo] = icr.lo;
  295.  
  296.     /*
  297.      * According to MP Specification, 20us should be enough to
  298.      * deliver the IPI.
  299.      */
  300.     delay(20);
  301.  
  302.     if (!apic_poll_errors())
  303.         return 0;
  304.  
  305.     icr.lo = l_apic[ICRlo];
  306.     if (icr.delivs == DELIVS_PENDING) {
  307. #ifdef CONFIG_DEBUG
  308.         printf("IPI is pending.\n");
  309. #endif
  310.     }
  311.  
  312.     icr.delmod = DELMOD_INIT;
  313.     icr.destmod = DESTMOD_PHYS;
  314.     icr.level = LEVEL_DEASSERT;
  315.     icr.shorthand = SHORTHAND_NONE;
  316.     icr.trigger_mode = TRIGMOD_LEVEL;
  317.     icr.vector = 0;
  318.     l_apic[ICRlo] = icr.lo;
  319.  
  320.     /*
  321.      * Wait 10ms as MP Specification specifies.
  322.      */
  323.     delay(10000);
  324.  
  325.     if (!is_82489DX_apic(l_apic[LAVR])) {
  326.         /*
  327.          * If this is not 82489DX-based l_apic we must send two STARTUP IPI's.
  328.          */
  329.         for (i = 0; i<2; i++) {
  330.             icr.lo = l_apic[ICRlo];
  331.             icr.vector = (uint8_t) (((uintptr_t) ap_boot) >> 12); /* calculate the reset vector */
  332.             icr.delmod = DELMOD_STARTUP;
  333.             icr.destmod = DESTMOD_PHYS;
  334.             icr.level = LEVEL_ASSERT;
  335.             icr.shorthand = SHORTHAND_NONE;
  336.             icr.trigger_mode = TRIGMOD_LEVEL;
  337.             l_apic[ICRlo] = icr.lo;
  338.             delay(200);
  339.         }
  340.     }
  341.    
  342.     return apic_poll_errors();
  343. }
  344.  
  345. /** Initialize Local APIC. */
  346. void l_apic_init(void)
  347. {
  348.     lvt_error_t error;
  349.     lvt_lint_t lint;
  350.     tpr_t tpr;
  351.     svr_t svr;
  352.     icr_t icr;
  353.     tdcr_t tdcr;
  354.     lvt_tm_t tm;
  355.     ldr_t ldr;
  356.     dfr_t dfr;
  357.     uint32_t t1, t2;
  358.  
  359.     /* Initialize LVT Error register. */
  360.     error.value = l_apic[LVT_Err];
  361.     error.masked = true;
  362.     l_apic[LVT_Err] = error.value;
  363.  
  364.     /* Initialize LVT LINT0 register. */
  365.     lint.value = l_apic[LVT_LINT0];
  366.     lint.masked = true;
  367.     l_apic[LVT_LINT0] = lint.value;
  368.  
  369.     /* Initialize LVT LINT1 register. */
  370.     lint.value = l_apic[LVT_LINT1];
  371.     lint.masked = true;
  372.     l_apic[LVT_LINT1] = lint.value;
  373.  
  374.     /* Task Priority Register initialization. */
  375.     tpr.value = l_apic[TPR];
  376.     tpr.pri_sc = 0;
  377.     tpr.pri = 0;
  378.     l_apic[TPR] = tpr.value;
  379.    
  380.     /* Spurious-Interrupt Vector Register initialization. */
  381.     svr.value = l_apic[SVR];
  382.     svr.vector = VECTOR_APIC_SPUR;
  383.     svr.lapic_enabled = true;
  384.     svr.focus_checking = true;
  385.     l_apic[SVR] = svr.value;
  386.  
  387.     if (CPU->arch.family >= 6)
  388.         enable_l_apic_in_msr();
  389.    
  390.     /* Interrupt Command Register initialization. */
  391.     icr.lo = l_apic[ICRlo];
  392.     icr.delmod = DELMOD_INIT;
  393.     icr.destmod = DESTMOD_PHYS;
  394.     icr.level = LEVEL_DEASSERT;
  395.     icr.shorthand = SHORTHAND_ALL_INCL;
  396.     icr.trigger_mode = TRIGMOD_LEVEL;
  397.     l_apic[ICRlo] = icr.lo;
  398.    
  399.     /* Timer Divide Configuration Register initialization. */
  400.     tdcr.value = l_apic[TDCR];
  401.     tdcr.div_value = DIVIDE_1;
  402.     l_apic[TDCR] = tdcr.value;
  403.  
  404.     /* Program local timer. */
  405.     tm.value = l_apic[LVT_Tm];
  406.     tm.vector = VECTOR_CLK;
  407.     tm.mode = TIMER_PERIODIC;
  408.     tm.masked = false;
  409.     l_apic[LVT_Tm] = tm.value;
  410.  
  411.     /*
  412.      * Measure and configure the timer to generate timer
  413.      * interrupt with period 1s/HZ seconds.
  414.      */
  415.     t1 = l_apic[CCRT];
  416.     l_apic[ICRT] = 0xffffffff;
  417.  
  418.     while (l_apic[CCRT] == t1)
  419.         ;
  420.        
  421.     t1 = l_apic[CCRT];
  422.     delay(1000000/HZ);
  423.     t2 = l_apic[CCRT];
  424.    
  425.     l_apic[ICRT] = t1-t2;
  426.    
  427.     /* Program Logical Destination Register. */
  428.     ASSERT(CPU->id < 8)
  429.     ldr.value = l_apic[LDR];
  430.     ldr.id = (uint8_t) (1 << CPU->id);
  431.     l_apic[LDR] = ldr.value;
  432.    
  433.     /* Program Destination Format Register for Flat mode. */
  434.     dfr.value = l_apic[DFR];
  435.     dfr.model = MODEL_FLAT;
  436.     l_apic[DFR] = dfr.value;
  437. }
  438.  
  439. /** Local APIC End of Interrupt. */
  440. void l_apic_eoi(void)
  441. {
  442.     l_apic[EOI] = 0;
  443. }
  444.  
  445. /** Dump content of Local APIC registers. */
  446. void l_apic_debug(void)
  447. {
  448. #ifdef LAPIC_VERBOSE
  449.     lvt_tm_t tm;
  450.     lvt_lint_t lint;
  451.     lvt_error_t error; 
  452.    
  453.     printf("LVT on cpu%d, LAPIC ID: %d\n", CPU->id, l_apic_id());
  454.  
  455.     tm.value = l_apic[LVT_Tm];
  456.     printf("LVT Tm: vector=%hhd, %s, %s, %s\n", tm.vector, delivs_str[tm.delivs], mask_str[tm.masked], tm_mode_str[tm.mode]);
  457.     lint.value = l_apic[LVT_LINT0];
  458.     printf("LVT LINT0: vector=%hhd, %s, %s, %s, irr=%d, %s, %s\n", tm.vector, delmod_str[lint.delmod], delivs_str[lint.delivs], intpol_str[lint.intpol], lint.irr, trigmod_str[lint.trigger_mode], mask_str[lint.masked]);
  459.     lint.value = l_apic[LVT_LINT1];
  460.     printf("LVT LINT1: vector=%hhd, %s, %s, %s, irr=%d, %s, %s\n", tm.vector, delmod_str[lint.delmod], delivs_str[lint.delivs], intpol_str[lint.intpol], lint.irr, trigmod_str[lint.trigger_mode], mask_str[lint.masked]); 
  461.     error.value = l_apic[LVT_Err];
  462.     printf("LVT Err: vector=%hhd, %s, %s\n", error.vector, delivs_str[error.delivs], mask_str[error.masked]);
  463. #endif
  464. }
  465.  
  466. /** Get Local APIC ID.
  467.  *
  468.  * @return Local APIC ID.
  469.  */
  470. uint8_t l_apic_id(void)
  471. {
  472.     l_apic_id_t idreg;
  473.    
  474.     idreg.value = l_apic[L_APIC_ID];
  475.     return idreg.apic_id;
  476. }
  477.  
  478. /** Read from IO APIC register.
  479.  *
  480.  * @param address IO APIC register address.
  481.  *
  482.  * @return Content of the addressed IO APIC register.
  483.  */
  484. uint32_t io_apic_read(uint8_t address)
  485. {
  486.     io_regsel_t regsel;
  487.    
  488.     regsel.value = io_apic[IOREGSEL];
  489.     regsel.reg_addr = address;
  490.     io_apic[IOREGSEL] = regsel.value;
  491.     return io_apic[IOWIN];
  492. }
  493.  
  494. /** Write to IO APIC register.
  495.  *
  496.  * @param address IO APIC register address.
  497.  * @param x Content to be written to the addressed IO APIC register.
  498.  */
  499. void io_apic_write(uint8_t address, uint32_t x)
  500. {
  501.     io_regsel_t regsel;
  502.    
  503.     regsel.value = io_apic[IOREGSEL];
  504.     regsel.reg_addr = address;
  505.     io_apic[IOREGSEL] = regsel.value;
  506.     io_apic[IOWIN] = x;
  507. }
  508.  
  509. /** Change some attributes of one item in I/O Redirection Table.
  510.  *
  511.  * @param pin IO APIC pin number.
  512.  * @param dest Interrupt destination address.
  513.  * @param v Interrupt vector to trigger.
  514.  * @param flags Flags.
  515.  */
  516. void io_apic_change_ioredtbl(uint8_t pin, uint8_t dest, uint8_t v, int flags)
  517. {
  518.     io_redirection_reg_t reg;
  519.     int dlvr = DELMOD_FIXED;
  520.    
  521.     if (flags & LOPRI)
  522.         dlvr = DELMOD_LOWPRI;
  523.  
  524.     reg.lo = io_apic_read((uint8_t) (IOREDTBL + pin * 2));
  525.     reg.hi = io_apic_read((uint8_t) (IOREDTBL + pin * 2 + 1));
  526.    
  527.     reg.dest = dest;
  528.     reg.destmod = DESTMOD_LOGIC;
  529.     reg.trigger_mode = TRIGMOD_EDGE;
  530.     reg.intpol = POLARITY_HIGH;
  531.     reg.delmod = dlvr;
  532.     reg.intvec = v;
  533.  
  534.     io_apic_write((uint8_t) (IOREDTBL + pin * 2), reg.lo);
  535.     io_apic_write((uint8_t) (IOREDTBL + pin * 2 + 1), reg.hi);
  536. }
  537.  
  538. /** Mask IRQs in IO APIC.
  539.  *
  540.  * @param irqmask Bitmask of IRQs to be masked (0 = do not mask, 1 = mask).
  541.  */
  542. void io_apic_disable_irqs(uint16_t irqmask)
  543. {
  544.     io_redirection_reg_t reg;
  545.     unsigned int i;
  546.     int pin;
  547.    
  548.     for (i = 0; i < 16; i++) {
  549.         if (irqmask & (1 << i)) {
  550.             /*
  551.              * Mask the signal input in IO APIC if there is a
  552.              * mapping for the respective IRQ number.
  553.              */
  554.             pin = smp_irq_to_pin(i);
  555.             if (pin != -1) {
  556.                 reg.lo = io_apic_read((uint8_t) (IOREDTBL + pin * 2));
  557.                 reg.masked = true;
  558.                 io_apic_write((uint8_t) (IOREDTBL + pin * 2), reg.lo);
  559.             }
  560.            
  561.         }
  562.     }
  563. }
  564.  
  565. /** Unmask IRQs in IO APIC.
  566.  *
  567.  * @param irqmask Bitmask of IRQs to be unmasked (0 = do not unmask, 1 = unmask).
  568.  */
  569. void io_apic_enable_irqs(uint16_t irqmask)
  570. {
  571.     unsigned int i;
  572.     int pin;
  573.     io_redirection_reg_t reg;  
  574.    
  575.     for (i = 0; i < 16; i++) {
  576.         if (irqmask & (1 << i)) {
  577.             /*
  578.              * Unmask the signal input in IO APIC if there is a
  579.              * mapping for the respective IRQ number.
  580.              */
  581.             pin = smp_irq_to_pin(i);
  582.             if (pin != -1) {
  583.                 reg.lo = io_apic_read((uint8_t) (IOREDTBL + pin * 2));
  584.                 reg.masked = false;
  585.                 io_apic_write((uint8_t) (IOREDTBL + pin * 2), reg.lo);
  586.             }
  587.            
  588.         }
  589.     }
  590. }
  591.  
  592. #endif /* CONFIG_SMP */
  593.  
  594. /** @}
  595.  */
  596.