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  1. /*
  2.  * Copyright (c) 2006 Martin Decky
  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 ia32xen_interrupt
  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 <func.h>
  41. #include <cpu.h>
  42. #include <arch/asm.h>
  43. #include <mm/tlb.h>
  44. #include <mm/as.h>
  45. #include <arch.h>
  46. #include <symtab.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.  
  55. /*
  56.  * Interrupt and exception dispatching.
  57.  */
  58.  
  59. void (* disable_irqs_function)(uint16_t irqmask) = NULL;
  60. void (* enable_irqs_function)(uint16_t irqmask) = NULL;
  61. void (* eoi_function)(void) = NULL;
  62.  
  63. void decode_istate(istate_t *istate)
  64. {
  65.     char *symbol = get_symtab_entry(istate->eip);
  66.  
  67.     if (!symbol)
  68.         symbol = "";
  69.  
  70.     if (CPU)
  71.         printf("----------------EXCEPTION OCCURED (cpu%d)----------------\n", CPU->id);
  72.     else
  73.         printf("----------------EXCEPTION OCCURED----------------\n");
  74.        
  75.     printf("%%eip: %#x (%s)\n",istate->eip,symbol);
  76.     printf("ERROR_WORD=%#x\n", istate->error_word);
  77.     printf("%%cs=%#x,flags=%#x\n", istate->cs, istate->eflags);
  78.     printf("%%eax=%#x, %%ecx=%#x, %%edx=%#x, %%esp=%#x\n",  istate->eax,istate->ecx,istate->edx,&istate->stack[0]);
  79. #ifdef CONFIG_DEBUG_ALLREGS
  80.     printf("%%esi=%#x, %%edi=%#x, %%ebp=%#x, %%ebx=%#x\n",  istate->esi,istate->edi,istate->ebp,istate->ebx);
  81. #endif
  82.     printf("stack: %#x, %#x, %#x, %#x\n", istate->stack[0], istate->stack[1], istate->stack[2], istate->stack[3]);
  83.     printf("       %#x, %#x, %#x, %#x\n", istate->stack[4], istate->stack[5], istate->stack[6], istate->stack[7]);
  84. }
  85.  
  86. static void trap_virtual_eoi(void)
  87. {
  88.     if (eoi_function)
  89.         eoi_function();
  90.     else
  91.         panic("no eoi_function\n");
  92.  
  93. }
  94.  
  95. static void null_interrupt(int n, istate_t *istate)
  96. {
  97.     fault_if_from_uspace(istate, "unserviced interrupt: %d", n);
  98.  
  99.     decode_istate(istate);
  100.     panic("unserviced interrupt: %d\n", n);
  101. }
  102.  
  103. /** General Protection Fault. */
  104. static void gp_fault(int n, istate_t *istate)
  105. {
  106.     if (TASK) {
  107.         count_t ver;
  108.        
  109.         spinlock_lock(&TASK->lock);
  110.         ver = TASK->arch.iomapver;
  111.         spinlock_unlock(&TASK->lock);
  112.    
  113.         if (CPU->arch.iomapver_copy != ver) {
  114.             /*
  115.              * This fault can be caused by an early access
  116.              * to I/O port because of an out-dated
  117.              * I/O Permission bitmap installed on CPU.
  118.              * Install the fresh copy and restart
  119.              * the instruction.
  120.              */
  121.             io_perm_bitmap_install();
  122.             return;
  123.         }
  124.         fault_if_from_uspace(istate, "general protection fault");
  125.     }
  126.  
  127.     decode_istate(istate);
  128.     panic("general protection fault\n");
  129. }
  130.  
  131. static void ss_fault(int n, istate_t *istate)
  132. {
  133.     fault_if_from_uspace(istate, "stack fault");
  134.  
  135.     decode_istate(istate);
  136.     panic("stack fault\n");
  137. }
  138.  
  139. static void simd_fp_exception(int n, istate_t *istate)
  140. {
  141.     uint32_t mxcsr;
  142.     asm
  143.     (
  144.         "stmxcsr %0;\n"
  145.         :"=m"(mxcsr)
  146.     );
  147.     fault_if_from_uspace(istate, "SIMD FP exception(19), MXCSR: %#zx",
  148.                  (unative_t)mxcsr);
  149.  
  150.     decode_istate(istate);
  151.     printf("MXCSR: %#zx\n",(unative_t)(mxcsr));
  152.     panic("SIMD FP exception(19)\n");
  153. }
  154.  
  155. static void nm_fault(int n, istate_t *istate)
  156. {
  157. #ifdef CONFIG_FPU_LAZY    
  158.     scheduler_fpu_lazy_request();
  159. #else
  160.     fault_if_from_uspace(istate, "fpu fault");
  161.     panic("fpu fault");
  162. #endif
  163. }
  164.  
  165. #ifdef CONFIG_SMP
  166. static void tlb_shootdown_ipi(int n, istate_t *istate)
  167. {
  168.     trap_virtual_eoi();
  169.     tlb_shootdown_ipi_recv();
  170. }
  171. #endif
  172.  
  173. /** Handler of IRQ exceptions */
  174. static void irq_interrupt(int n, istate_t *istate)
  175. {
  176.     ASSERT(n >= IVT_IRQBASE);
  177.    
  178.     int inum = n - IVT_IRQBASE;
  179.     bool ack = false;
  180.     ASSERT(inum < IRQ_COUNT);
  181.     ASSERT((inum != IRQ_PIC_SPUR) && (inum != IRQ_PIC1));
  182.    
  183.     irq_t *irq = irq_dispatch_and_lock(inum);
  184.     if (irq) {
  185.         /*
  186.          * The IRQ handler was found.
  187.          */
  188.          
  189.         if (irq->preack) {
  190.             /* Send EOI before processing the interrupt */
  191.             trap_virtual_eoi();
  192.             ack = true;
  193.         }
  194.         irq->handler(irq, irq->arg);
  195.         spinlock_unlock(&irq->lock);
  196.     } else {
  197.         /*
  198.          * Spurious interrupt.
  199.          */
  200. #ifdef CONFIG_DEBUG
  201.         printf("cpu%d: spurious interrupt (inum=%d)\n", CPU->id, inum);
  202. #endif
  203.     }
  204.    
  205.     if (!ack)
  206.         trap_virtual_eoi();
  207. }
  208.  
  209. void interrupt_init(void)
  210. {
  211.     int i;
  212.    
  213.     for (i = 0; i < IVT_ITEMS; i++)
  214.         exc_register(i, "null", (iroutine) null_interrupt);
  215.    
  216.     for (i = 0; i < IRQ_COUNT; i++) {
  217.         if ((i != IRQ_PIC_SPUR) && (i != IRQ_PIC1))
  218.             exc_register(IVT_IRQBASE + i, "irq", (iroutine) irq_interrupt);
  219.     }
  220.    
  221.     exc_register(7, "nm_fault", (iroutine) nm_fault);
  222.     exc_register(12, "ss_fault", (iroutine) ss_fault);
  223.     exc_register(13, "gp_fault", (iroutine) gp_fault);
  224.     exc_register(19, "simd_fp", (iroutine) simd_fp_exception);
  225.    
  226. #ifdef CONFIG_SMP
  227.     exc_register(VECTOR_TLB_SHOOTDOWN_IPI, "tlb_shootdown", (iroutine) tlb_shootdown_ipi);
  228. #endif
  229. }
  230.  
  231. void trap_virtual_enable_irqs(uint16_t irqmask)
  232. {
  233.     if (enable_irqs_function)
  234.         enable_irqs_function(irqmask);
  235.     else
  236.         panic("no enable_irqs_function\n");
  237. }
  238.  
  239. void trap_virtual_disable_irqs(uint16_t irqmask)
  240. {
  241.     if (disable_irqs_function)
  242.         disable_irqs_function(irqmask);
  243.     else
  244.         panic("no disable_irqs_function\n");
  245. }
  246.  
  247. /** @}
  248.  */
  249.  
  250.