palacios/src/palacios/vmm_intr.c

   1 /*
   2  * This file is part of the Palacios Virtual Machine Monitor developed
   3  * by the V3VEE Project with funding from the United States National
   4  * Science Foundation and the Department of Energy.
   5  *
   6  * The V3VEE Project is a joint project between Northwestern University
   7  * and the University of New Mexico.  You can find out more at
   8  * http://www.v3vee.org
   9  *
  10  * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
  11  * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
  12  * All rights reserved.
  13  *
  14  * Author: Jack Lange <jarusl@cs.northwestern.edu>
  15  *
  16  * This is free software.  You are permitted to use,
  17  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  18  */
  19
  20
  21 #include <palacios/vmm_intr.h>
  22 #include <palacios/vmm.h>
  23
  24 #include <palacios/vm_guest.h>
  25
  26 #ifndef DEBUG_INTERRUPTS
  27 #undef PrintDebug
  28 #define PrintDebug(fmt, args...)
  29 #endif
  30
  31
  32
  33 /*Zheng 07/30/2008*/
  34 void init_interrupt_state(struct guest_info * info) {
  35   info->intr_state.excp_pending = 0;
  36   info->intr_state.excp_num = 0;
  37   info->intr_state.excp_error_code = 0;
  38
  39   info->vm_ops.raise_irq = &v3_raise_irq;
  40   info->vm_ops.lower_irq = &v3_lower_irq; //Zheng added
  41 }
  42
  43 void set_intr_controller(struct guest_info * info, struct intr_ctrl_ops * ops, void * state) {
  44   info->intr_state.controller = ops;
  45   info->intr_state.controller_state = state;
  46 }
  47
  48
  49
  50 // This structure is used to dispatch
  51 // interrupts delivered to vmm via deliver interrupt to vmm
  52 // it is what we put into the opaque field given to
  53 // the host os when we install the handler
  54 struct vmm_intr_decode {
  55   void              (*handler)(struct vmm_intr_state *state);
  56   // This opaque is user supplied by the caller
  57   // of hook_irq_new
  58   void              *opaque;
  59 };
  60
  61 int v3_hook_irq(uint_t irq,
  62              void (*handler)(struct vmm_intr_state *state),
  63              void  *opaque)
  64 {
  65   struct vmm_intr_decode *d = (struct vmm_intr_decode *)V3_Malloc(sizeof(struct vmm_intr_decode));
  66
  67   if (!d) { return -1; }
  68
  69   d->handler = handler;
  70   d->opaque = opaque;
  71
  72   if (V3_Hook_Interrupt(irq,d)) {
  73     PrintError("hook_irq: failed to hook irq 0x%x to decode 0x%x\n", irq,d);
  74     return -1;
  75   } else {
  76     PrintDebug("hook_irq: hooked irq 0x%x to decode 0x%x\n", irq,d);
  77     return 0;
  78   }
  79 }
  80
  81
  82 void deliver_interrupt_to_vmm(struct vmm_intr_state *state)
  83 {
  84
  85   PrintDebug("deliver_interrupt_to_vmm: state=0x%x\n",state);
  86
  87   struct vmm_intr_decode *d = (struct vmm_intr_decode *)(state->opaque);
  88
  89   void *temp = state->opaque;
  90   state->opaque = d->opaque;
  91
  92   d->handler(state);
  93
  94   state->opaque=temp;
  95 }
  96
  97
  98 static void guest_injection_irq_handler(struct vmm_intr_state *state)
  99 {
 100   struct guest_info *guest = (struct guest_info *)(state->opaque);
 101   PrintDebug("[guest_injection_irq_handler] raise_irq=0x%x (guest=0x%x)\n", state->irq, guest);
 102   PrintDebug("guest_irq_injection: state=0x%x\n", state);
 103   guest->vm_ops.raise_irq(guest,state->irq);
 104 }
 105
 106
 107 int v3_hook_irq_for_guest_injection(struct guest_info *info, int irq)
 108 {
 109
 110   int rc = v3_hook_irq(irq,
 111                        guest_injection_irq_handler,
 112                        info);
 113
 114   if (rc) {
 115     PrintError("guest_irq_injection: failed to hook irq 0x%x (guest=0x%x)\n", irq, info);
 116     return -1;
 117   } else {
 118     PrintDebug("guest_irq_injection: hooked irq 0x%x (guest=0x%x)\n", irq, info);
 119     return 0;
 120   }
 121 }
 122
 123
 124
 125
 126 int v3_raise_exception_with_error(struct guest_info * info, uint_t excp, uint_t error_code) {
 127   struct vm_intr * intr_state = &(info->intr_state);
 128
 129   if (intr_state->excp_pending == 0) {
 130     intr_state->excp_pending = 1;
 131     intr_state->excp_num = excp;
 132     intr_state->excp_error_code = error_code;
 133     intr_state->excp_error_code_valid = 1;
 134     PrintDebug("[v3_raise_exception_with_error] error code: %x\n", error_code);
 135   } else {
 136     PrintError("exception already pending, currently not implemented\n");
 137     return -1;
 138   }
 139
 140   return 0;
 141 }
 142
 143 int v3_raise_exception(struct guest_info * info, uint_t excp) {
 144   struct vm_intr * intr_state = &(info->intr_state);
 145   PrintDebug("[v3_raise_exception]\n");
 146   if (intr_state->excp_pending == 0) {
 147     intr_state->excp_pending = 1;
 148     intr_state->excp_num = excp;
 149     intr_state->excp_error_code = 0;
 150     intr_state->excp_error_code_valid = 0;
 151   } else {
 152     PrintError("exception already pending, currently not implemented\n");
 153     return -1;
 154   }
 155
 156   return 0;
 157 }
 158
 159 /*Zheng 07/30/2008*/
 160
 161 int v3_lower_irq(struct guest_info * info, int irq) {
 162   // Look up PIC and resend
 163   V3_ASSERT(info);
 164   V3_ASSERT(info->intr_state.controller);
 165   V3_ASSERT(info->intr_state.controller->raise_intr);
 166
 167   PrintDebug("[v3_lower_irq]\n");
 168
 169   if ((info->intr_state.controller) &&
 170       (info->intr_state.controller->raise_intr)) {
 171     info->intr_state.controller->lower_intr(info->intr_state.controller_state, irq);
 172   } else {
 173     PrintDebug("There is no registered Interrupt Controller... (NULL POINTER)\n");
 174     return -1;
 175   }
 176
 177   return 0;
 178 }
 179
 180 int v3_raise_irq(struct guest_info * info, int irq) {
 181   // Look up PIC and resend
 182   V3_ASSERT(info);
 183   V3_ASSERT(info->intr_state.controller);
 184   V3_ASSERT(info->intr_state.controller->raise_intr);
 185
 186   PrintDebug("[v3_raise_irq]\n");
 187
 188   if ((info->intr_state.controller) &&
 189       (info->intr_state.controller->raise_intr)) {
 190     info->intr_state.controller->raise_intr(info->intr_state.controller_state, irq);
 191   } else {
 192     PrintDebug("There is no registered Interrupt Controller... (NULL POINTER)\n");
 193     return -1;
 194   }
 195
 196   return 0;
 197 }
 198
 199
 200
 201 int intr_pending(struct guest_info * info) {
 202   struct vm_intr * intr_state = &(info->intr_state);
 203
 204   //  PrintDebug("[intr_pending]\n");
 205   if (intr_state->excp_pending == 1) {
 206     return 1;
 207   } else if (intr_state->controller->intr_pending(intr_state->controller_state) == 1) {
 208     return 1;
 209   }
 210
 211   /* Check [A]PIC */
 212
 213   return 0;
 214 }
 215
 216
 217 uint_t get_intr_number(struct guest_info * info) {
 218   struct vm_intr * intr_state = &(info->intr_state);
 219
 220   if (intr_state->excp_pending == 1) {
 221     return intr_state->excp_num;
 222   } else if (intr_state->controller->intr_pending(intr_state->controller_state)) {
 223     PrintDebug("[get_intr_number] intr_number = %d\n", intr_state->controller->get_intr_number(intr_state->controller_state));
 224     return intr_state->controller->get_intr_number(intr_state->controller_state);
 225   }
 226
 227   /* someway to get the [A]PIC intr */
 228
 229   return 0;
 230 }
 231
 232
 233 intr_type_t get_intr_type(struct guest_info * info) {
 234  struct vm_intr * intr_state = &(info->intr_state);
 235
 236   if (intr_state->excp_pending) {
 237     PrintDebug("[get_intr_type] Exception\n");
 238     return EXCEPTION;
 239   } else if (intr_state->controller->intr_pending(intr_state->controller_state)) {
 240     PrintDebug("[get_intr_type] External_irq\n");
 241     return EXTERNAL_IRQ;
 242   }
 243     PrintDebug("[get_intr_type] Invalid_Intr\n");
 244   return INVALID_INTR;
 245 }
 246
 247
 248
 249
 250
 251
 252 int injecting_intr(struct guest_info * info, uint_t intr_num, intr_type_t type) {
 253   struct vm_intr * intr_state = &(info->intr_state);
 254
 255   if (type == EXCEPTION) {
 256     PrintDebug("[injecting_intr] Exception\n");
 257     intr_state->excp_pending = 0;
 258     intr_state->excp_num = 0;
 259     intr_state->excp_error_code = 0;
 260     intr_state->excp_error_code_valid = 0;
 261
 262   } else if (type == EXTERNAL_IRQ) {
 263     PrintDebug("[injecting_intr] External_Irq with intr_num = %x\n", intr_num);
 264     return intr_state->controller->begin_irq(intr_state->controller_state, intr_num);
 265   }
 266
 267   return 0;
 268 }