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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 <symtab.h>
  48. #include <proc/thread.h>
  49. #include <proc/task.h>
  50. #include <synch/spinlock.h>
  51. #include <arch/ddi/ddi.h>
  52. #include <ipc/sysipc.h>
  53. #include <interrupt.h>
  54. #include <ddi/irq.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 = get_symtab_entry(istate->eip);
  67.  
  68.     if (!symbol)
  69.         symbol = "";
  70.  
  71.     if (CPU)
  72.         printf("----------------EXCEPTION OCCURED (cpu%u)----------------\n", CPU->id);
  73.     else
  74.         printf("----------------EXCEPTION OCCURED----------------\n");
  75.        
  76.     printf("%%eip: %#lx (%s)\n", istate->eip, symbol);
  77.     printf("ERROR_WORD=%#lx\n", istate->error_word);
  78.     printf("%%cs=%#lx,flags=%#lx\n", istate->cs, istate->eflags);
  79.     printf("%%eax=%#lx, %%ecx=%#lx, %%edx=%#lx, %%esp=%p\n", istate->eax, istate->ecx, istate->edx, &istate->stack[0]);
  80.     printf("stack: %#lx, %#lx, %#lx, %#lx\n", istate->stack[0], istate->stack[1], istate->stack[2], istate->stack[3]);
  81.     printf("       %#lx, %#lx, %#lx, %#lx\n", istate->stack[4], istate->stack[5], istate->stack[6], istate->stack[7]);
  82. }
  83.  
  84. static void trap_virtual_eoi(void)
  85. {
  86.     if (eoi_function)
  87.         eoi_function();
  88.     else
  89.         panic("No eoi_function.");
  90.  
  91. }
  92.  
  93. static void null_interrupt(int n, istate_t *istate)
  94. {
  95.     fault_if_from_uspace(istate, "Unserviced interrupt: %d.", n);
  96.  
  97.     decode_istate(istate);
  98.     panic("Unserviced interrupt: %d.", n);
  99. }
  100.  
  101. /** General Protection Fault. */
  102. static void gp_fault(int n __attribute__((unused)), istate_t *istate)
  103. {
  104.     if (TASK) {
  105.         count_t ver;
  106.        
  107.         spinlock_lock(&TASK->lock);
  108.         ver = TASK->arch.iomapver;
  109.         spinlock_unlock(&TASK->lock);
  110.    
  111.         if (CPU->arch.iomapver_copy != ver) {
  112.             /*
  113.              * This fault can be caused by an early access
  114.              * to I/O port because of an out-dated
  115.              * I/O Permission bitmap installed on CPU.
  116.              * Install the fresh copy and restart
  117.              * the instruction.
  118.              */
  119.             io_perm_bitmap_install();
  120.             return;
  121.         }
  122.         fault_if_from_uspace(istate, "General protection fault.");
  123.     }
  124.  
  125.     decode_istate(istate);
  126.     panic("General protection fault.");
  127. }
  128.  
  129. static void ss_fault(int n __attribute__((unused)), istate_t *istate)
  130. {
  131.     fault_if_from_uspace(istate, "Stack fault.");
  132.  
  133.     decode_istate(istate);
  134.     panic("Stack fault.");
  135. }
  136.  
  137. static void simd_fp_exception(int n __attribute__((unused)), istate_t *istate)
  138. {
  139.     uint32_t mxcsr;
  140.     asm (
  141.         "stmxcsr %0;\n"
  142.         : "=m" (mxcsr)
  143.     );
  144.     fault_if_from_uspace(istate, "SIMD FP exception(19), MXCSR: %#zx.",
  145.         (unative_t) mxcsr);
  146.  
  147.     decode_istate(istate);
  148.     printf("MXCSR: %#lx\n", mxcsr);
  149.     panic("SIMD FP exception(19).");
  150. }
  151.  
  152. static void nm_fault(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))
  153. {
  154. #ifdef CONFIG_FPU_LAZY    
  155.     scheduler_fpu_lazy_request();
  156. #else
  157.     fault_if_from_uspace(istate, "FPU fault.");
  158.     panic("FPU fault.");
  159. #endif
  160. }
  161.  
  162. #ifdef CONFIG_SMP
  163. static void tlb_shootdown_ipi(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))
  164. {
  165.     trap_virtual_eoi();
  166.     tlb_shootdown_ipi_recv();
  167. }
  168. #endif
  169.  
  170. /** Handler of IRQ exceptions */
  171. static void irq_interrupt(int n, istate_t *istate __attribute__((unused)))
  172. {
  173.     ASSERT(n >= IVT_IRQBASE);
  174.    
  175.     int inum = n - IVT_IRQBASE;
  176.     bool ack = false;
  177.     ASSERT(inum < IRQ_COUNT);
  178.     ASSERT((inum != IRQ_PIC_SPUR) && (inum != IRQ_PIC1));
  179.    
  180.     irq_t *irq = irq_dispatch_and_lock(inum);
  181.     if (irq) {
  182.         /*
  183.          * The IRQ handler was found.
  184.          */
  185.          
  186.         if (irq->preack) {
  187.             /* Send EOI before processing the interrupt */
  188.             trap_virtual_eoi();
  189.             ack = true;
  190.         }
  191.         irq->handler(irq, irq->arg);
  192.         spinlock_unlock(&irq->lock);
  193.     } else {
  194.         /*
  195.          * Spurious interrupt.
  196.          */
  197. #ifdef CONFIG_DEBUG
  198.         printf("cpu%u: spurious interrupt (inum=%d)\n", CPU->id, inum);
  199. #endif
  200.     }
  201.    
  202.     if (!ack)
  203.         trap_virtual_eoi();
  204. }
  205.  
  206. void interrupt_init(void)
  207. {
  208.     int i;
  209.    
  210.     for (i = 0; i < IVT_ITEMS; i++)
  211.         exc_register(i, "null", (iroutine) null_interrupt);
  212.    
  213.     for (i = 0; i < IRQ_COUNT; i++) {
  214.         if ((i != IRQ_PIC_SPUR) && (i != IRQ_PIC1))
  215.             exc_register(IVT_IRQBASE + i, "irq", (iroutine) irq_interrupt);
  216.     }
  217.    
  218.     exc_register(7, "nm_fault", (iroutine) nm_fault);
  219.     exc_register(12, "ss_fault", (iroutine) ss_fault);
  220.     exc_register(13, "gp_fault", (iroutine) gp_fault);
  221.     exc_register(19, "simd_fp", (iroutine) simd_fp_exception);
  222.    
  223. #ifdef CONFIG_SMP
  224.     exc_register(VECTOR_TLB_SHOOTDOWN_IPI, "tlb_shootdown", (iroutine) tlb_shootdown_ipi);
  225. #endif
  226. }
  227.  
  228. void trap_virtual_enable_irqs(uint16_t irqmask)
  229. {
  230.     if (enable_irqs_function)
  231.         enable_irqs_function(irqmask);
  232.     else
  233.         panic("No enable_irqs_function.");
  234. }
  235.  
  236. void trap_virtual_disable_irqs(uint16_t irqmask)
  237. {
  238.     if (disable_irqs_function)
  239.         disable_irqs_function(irqmask);
  240.     else
  241.         panic("No disable_irqs_function.");
  242. }
  243.  
  244. /** @}
  245.  */
  246.