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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 ia32interrupt
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <arch/interrupt.h>
  36. #include <syscall/syscall.h>
  37. #include <print.h>
  38. #include <debug.h>
  39. #include <panic.h>
  40. #include <arch/drivers/i8259.h>
  41. #include <func.h>
  42. #include <cpu.h>
  43. #include <arch/asm.h>
  44. #include <mm/tlb.h>
  45. #include <mm/as.h>
  46. #include <arch.h>
  47. #include <proc/thread.h>
  48. #include <proc/task.h>
  49. #include <synch/spinlock.h>
  50. #include <arch/ddi/ddi.h>
  51. #include <ipc/sysipc.h>
  52. #include <interrupt.h>
  53. #include <ddi/irq.h>
  54. #include <symtab.h>
  55.  
  56. /*
  57.  * Interrupt and exception dispatching.
  58.  */
  59.  
  60. void (* disable_irqs_function)(uint16_t irqmask) = NULL;
  61. void (* enable_irqs_function)(uint16_t irqmask) = NULL;
  62. void (* eoi_function)(void) = NULL;
  63.  
  64. void decode_istate(istate_t *istate)
  65. {
  66.     char *symbol;
  67.  
  68.     symbol = symtab_fmt_name_lookup(istate->eip);
  69.  
  70.     if (CPU)
  71.         printf("----------------EXCEPTION OCCURED (cpu%u)----------------\n", CPU->id);
  72.     else
  73.         printf("----------------EXCEPTION OCCURED----------------\n");
  74.        
  75.     printf("%%eip: %#lx (%s)\n", istate->eip, symbol);
  76.     printf("ERROR_WORD=%#lx\n", istate->error_word);
  77.     printf("%%cs=%#lx,flags=%#lx\n", istate->cs, istate->eflags);
  78.     printf("%%eax=%#lx, %%ecx=%#lx, %%edx=%#lx, %%esp=%p\n", istate->eax, istate->ecx, istate->edx, &istate->stack[0]);
  79.     printf("stack: %#lx, %#lx, %#lx, %#lx\n", istate->stack[0], istate->stack[1], istate->stack[2], istate->stack[3]);
  80.     printf("       %#lx, %#lx, %#lx, %#lx\n", istate->stack[4], istate->stack[5], istate->stack[6], istate->stack[7]);
  81. }
  82.  
  83. static void trap_virtual_eoi(void)
  84. {
  85.     if (eoi_function)
  86.         eoi_function();
  87.     else
  88.         panic("No eoi_function.");
  89.  
  90. }
  91.  
  92. static void null_interrupt(int n, istate_t *istate)
  93. {
  94.     fault_if_from_uspace(istate, "Unserviced interrupt: %d.", n);
  95.  
  96.     decode_istate(istate);
  97.     panic("Unserviced interrupt: %d.", n);
  98. }
  99.  
  100. /** General Protection Fault. */
  101. static void gp_fault(int n __attribute__((unused)), istate_t *istate)
  102. {
  103.     if (TASK) {
  104.         count_t ver;
  105.        
  106.         spinlock_lock(&TASK->lock);
  107.         ver = TASK->arch.iomapver;
  108.         spinlock_unlock(&TASK->lock);
  109.    
  110.         if (CPU->arch.iomapver_copy != ver) {
  111.             /*
  112.              * This fault can be caused by an early access
  113.              * to I/O port because of an out-dated
  114.              * I/O Permission bitmap installed on CPU.
  115.              * Install the fresh copy and restart
  116.              * the instruction.
  117.              */
  118.             io_perm_bitmap_install();
  119.             return;
  120.         }
  121.         fault_if_from_uspace(istate, "General protection fault.");
  122.     }
  123.  
  124.     decode_istate(istate);
  125.     panic("General protection fault.");
  126. }
  127.  
  128. static void ss_fault(int n __attribute__((unused)), istate_t *istate)
  129. {
  130.     fault_if_from_uspace(istate, "Stack fault.");
  131.  
  132.     decode_istate(istate);
  133.     panic("Stack fault.");
  134. }
  135.  
  136. static void simd_fp_exception(int n __attribute__((unused)), istate_t *istate)
  137. {
  138.     uint32_t mxcsr;
  139.     asm (
  140.         "stmxcsr %[mxcsr]\n"
  141.         : [mxcsr] "=m" (mxcsr)
  142.     );
  143.     fault_if_from_uspace(istate, "SIMD FP exception(19), MXCSR: %#zx.",
  144.         (unative_t) mxcsr);
  145.    
  146.     decode_istate(istate);
  147.     printf("MXCSR: %#lx\n", mxcsr);
  148.     panic("SIMD FP exception(19).");
  149. }
  150.  
  151. static void nm_fault(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))
  152. {
  153. #ifdef CONFIG_FPU_LAZY    
  154.     scheduler_fpu_lazy_request();
  155. #else
  156.     fault_if_from_uspace(istate, "FPU fault.");
  157.     panic("FPU fault.");
  158. #endif
  159. }
  160.  
  161. #ifdef CONFIG_SMP
  162. static void tlb_shootdown_ipi(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))
  163. {
  164.     trap_virtual_eoi();
  165.     tlb_shootdown_ipi_recv();
  166. }
  167. #endif
  168.  
  169. /** Handler of IRQ exceptions */
  170. static void irq_interrupt(int n, istate_t *istate __attribute__((unused)))
  171. {
  172.     ASSERT(n >= IVT_IRQBASE);
  173.    
  174.     int inum = n - IVT_IRQBASE;
  175.     bool ack = false;
  176.     ASSERT(inum < IRQ_COUNT);
  177.     ASSERT((inum != IRQ_PIC_SPUR) && (inum != IRQ_PIC1));
  178.    
  179.     irq_t *irq = irq_dispatch_and_lock(inum);
  180.     if (irq) {
  181.         /*
  182.          * The IRQ handler was found.
  183.          */
  184.          
  185.         if (irq->preack) {
  186.             /* Send EOI before processing the interrupt */
  187.             trap_virtual_eoi();
  188.             ack = true;
  189.         }
  190.         irq->handler(irq);
  191.         spinlock_unlock(&irq->lock);
  192.     } else {
  193.         /*
  194.          * Spurious interrupt.
  195.          */
  196. #ifdef CONFIG_DEBUG
  197.         printf("cpu%u: spurious interrupt (inum=%d)\n", CPU->id, inum);
  198. #endif
  199.     }
  200.    
  201.     if (!ack)
  202.         trap_virtual_eoi();
  203. }
  204.  
  205. void interrupt_init(void)
  206. {
  207.     int i;
  208.    
  209.     for (i = 0; i < IVT_ITEMS; i++)
  210.         exc_register(i, "null", (iroutine) null_interrupt);
  211.    
  212.     for (i = 0; i < IRQ_COUNT; i++) {
  213.         if ((i != IRQ_PIC_SPUR) && (i != IRQ_PIC1))
  214.             exc_register(IVT_IRQBASE + i, "irq", (iroutine) irq_interrupt);
  215.     }
  216.    
  217.     exc_register(7, "nm_fault", (iroutine) nm_fault);
  218.     exc_register(12, "ss_fault", (iroutine) ss_fault);
  219.     exc_register(13, "gp_fault", (iroutine) gp_fault);
  220.     exc_register(19, "simd_fp", (iroutine) simd_fp_exception);
  221.    
  222. #ifdef CONFIG_SMP
  223.     exc_register(VECTOR_TLB_SHOOTDOWN_IPI, "tlb_shootdown", (iroutine) tlb_shootdown_ipi);
  224. #endif
  225. }
  226.  
  227. void trap_virtual_enable_irqs(uint16_t irqmask)
  228. {
  229.     if (enable_irqs_function)
  230.         enable_irqs_function(irqmask);
  231.     else
  232.         panic("No enable_irqs_function.");
  233. }
  234.  
  235. void trap_virtual_disable_irqs(uint16_t irqmask)
  236. {
  237.     if (disable_irqs_function)
  238.         disable_irqs_function(irqmask);
  239.     else
  240.         panic("No disable_irqs_function.");
  241. }
  242.  
  243. /** @}
  244.  */
  245.