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
  34 void v3_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   memset((uchar_t *)(info->intr_state.hooks), 0, sizeof(struct v3_irq_hook *) * 256);
  40
  41   info->vm_ops.raise_irq = &v3_raise_irq;
  42   info->vm_ops.lower_irq = &v3_lower_irq;
  43 }
  44
  45 void v3_set_intr_controller(struct guest_info * info, struct intr_ctrl_ops * ops, void * state) {
  46   info->intr_state.controller = ops;
  47   info->intr_state.controller_state = state;
  48 }
  49
  50
  51
  52
  53 static inline struct v3_irq_hook * get_irq_hook(struct guest_info * info, uint_t irq) {
  54   V3_ASSERT(irq <= 256);
  55   return info->intr_state.hooks[irq];
  56 }
  57
  58
  59 int v3_hook_irq(struct guest_info * info,
  60                 uint_t irq,
  61                 int (*handler)(struct guest_info * info, struct v3_interrupt * intr, void * priv_data),
  62                 void  * priv_data)
  63 {
  64   struct v3_irq_hook * hook = (struct v3_irq_hook *)V3_Malloc(sizeof(struct v3_irq_hook));
  65
  66   if (hook == NULL) {
  67     return -1;
  68   }
  69
  70   if (get_irq_hook(info, irq) != NULL) {
  71     PrintError("IRQ %d already hooked\n", irq);
  72     return -1;
  73   }
  74
  75   hook->handler = handler;
  76   hook->priv_data = priv_data;
  77
  78   info->intr_state.hooks[irq] = hook;
  79
  80   if (V3_Hook_Interrupt(info, irq)) {
  81     PrintError("hook_irq: failed to hook irq %d\n", irq);
  82     return -1;
  83   } else {
  84     PrintDebug("hook_irq: hooked irq %d\n", irq);
  85     return 0;
  86   }
  87 }
  88
  89
  90
  91 static int passthrough_irq_handler(struct guest_info * info, struct v3_interrupt * intr, void * priv_data)
  92 {
  93
  94   PrintDebug("[passthrough_irq_handler] raise_irq=%d (guest=0x%x)\n", intr->irq, info);
  95   return v3_raise_irq(info, intr->irq);
  96
  97 }
  98
  99 int v3_hook_passthrough_irq(struct guest_info * info, uint_t irq)
 100 {
 101
 102   int rc = v3_hook_irq(info,
 103                        irq,
 104                        passthrough_irq_handler,
 105                        NULL);
 106
 107   if (rc) {
 108     PrintError("guest_irq_injection: failed to hook irq 0x%x (guest=0x%x)\n", irq, info);
 109     return -1;
 110   } else {
 111     PrintDebug("guest_irq_injection: hooked irq 0x%x (guest=0x%x)\n", irq, info);
 112     return 0;
 113   }
 114 }
 115
 116
 117
 118
 119
 120 int v3_deliver_irq(struct guest_info * info, struct v3_interrupt * intr) {
 121   PrintDebug("v3_deliver_irq: irq=%d state=0x%x, \n", intr->irq, intr);
 122
 123   struct v3_irq_hook * hook = get_irq_hook(info, intr->irq);
 124
 125   if (hook == NULL) {
 126     PrintError("Attempting to deliver interrupt to non registered hook(irq=%d)\n", intr->irq);
 127     return -1;
 128   }
 129
 130   return hook->handler(info, intr, hook->priv_data);
 131 }
 132
 133
 134
 135
 136
 137
 138
 139
 140 int v3_raise_exception_with_error(struct guest_info * info, uint_t excp, uint_t error_code) {
 141   struct v3_intr_state * intr_state = &(info->intr_state);
 142
 143   if (intr_state->excp_pending == 0) {
 144     intr_state->excp_pending = 1;
 145     intr_state->excp_num = excp;
 146     intr_state->excp_error_code = error_code;
 147     intr_state->excp_error_code_valid = 1;
 148     PrintDebug("[v3_raise_exception_with_error] error code: %x\n", error_code);
 149   } else {
 150     PrintError("exception already pending, currently not implemented\n");
 151     return -1;
 152   }
 153
 154   return 0;
 155 }
 156
 157 int v3_raise_exception(struct guest_info * info, uint_t excp) {
 158   struct v3_intr_state * intr_state = &(info->intr_state);
 159   PrintDebug("[v3_raise_exception]\n");
 160   if (intr_state->excp_pending == 0) {
 161     intr_state->excp_pending = 1;
 162     intr_state->excp_num = excp;
 163     intr_state->excp_error_code = 0;
 164     intr_state->excp_error_code_valid = 0;
 165   } else {
 166     PrintError("exception already pending, currently not implemented\n");
 167     return -1;
 168   }
 169
 170   return 0;
 171 }
 172
 173
 174 int v3_lower_irq(struct guest_info * info, int irq) {
 175   // Look up PIC and resend
 176   V3_ASSERT(info);
 177   V3_ASSERT(info->intr_state.controller);
 178   V3_ASSERT(info->intr_state.controller->lower_intr);
 179
 180   PrintDebug("[v3_lower_irq]\n");
 181
 182   if ((info->intr_state.controller) &&
 183       (info->intr_state.controller->lower_intr)) {
 184     info->intr_state.controller->lower_intr(info->intr_state.controller_state, irq);
 185   } else {
 186     PrintError("There is no registered Interrupt Controller... (NULL POINTER)\n");
 187     return -1;
 188   }
 189
 190   return 0;
 191 }
 192
 193 int v3_raise_irq(struct guest_info * info, int irq) {
 194   // Look up PIC and resend
 195   V3_ASSERT(info);
 196   V3_ASSERT(info->intr_state.controller);
 197   V3_ASSERT(info->intr_state.controller->raise_intr);
 198
 199   PrintDebug("[v3_raise_irq]\n");
 200
 201   if ((info->intr_state.controller) &&
 202       (info->intr_state.controller->raise_intr)) {
 203     info->intr_state.controller->raise_intr(info->intr_state.controller_state, irq);
 204   } else {
 205     PrintError("There is no registered Interrupt Controller... (NULL POINTER)\n");
 206     return -1;
 207   }
 208
 209   return 0;
 210 }
 211
 212
 213
 214 int v3_intr_pending(struct guest_info * info) {
 215   struct v3_intr_state * intr_state = &(info->intr_state);
 216
 217   //  PrintDebug("[intr_pending]\n");
 218   if (intr_state->excp_pending == 1) {
 219     return 1;
 220   } else if (intr_state->controller->intr_pending(intr_state->controller_state) == 1) {
 221     return 1;
 222   }
 223
 224   /* Check [A]PIC */
 225
 226   return 0;
 227 }
 228
 229
 230 uint_t v3_get_intr_number(struct guest_info * info) {
 231   struct v3_intr_state * intr_state = &(info->intr_state);
 232
 233   if (intr_state->excp_pending == 1) {
 234     return intr_state->excp_num;
 235   } else if (intr_state->controller->intr_pending(intr_state->controller_state)) {
 236     PrintDebug("[get_intr_number] intr_number = %d\n", intr_state->controller->get_intr_number(intr_state->controller_state));
 237     return intr_state->controller->get_intr_number(intr_state->controller_state);
 238   }
 239
 240   /* someway to get the [A]PIC intr */
 241
 242   return 0;
 243 }
 244
 245
 246 intr_type_t v3_get_intr_type(struct guest_info * info) {
 247   struct v3_intr_state * intr_state = &(info->intr_state);
 248
 249   if (intr_state->excp_pending) {
 250     PrintDebug("[get_intr_type] Exception\n");
 251     return EXCEPTION;
 252   } else if (intr_state->controller->intr_pending(intr_state->controller_state)) {
 253     PrintDebug("[get_intr_type] External_irq\n");
 254     return EXTERNAL_IRQ;
 255   }
 256     PrintDebug("[get_intr_type] Invalid_Intr\n");
 257   return INVALID_INTR;
 258 }
 259
 260
 261
 262
 263
 264
 265 int v3_injecting_intr(struct guest_info * info, uint_t intr_num, intr_type_t type) {
 266   struct v3_intr_state * intr_state = &(info->intr_state);
 267
 268   if (type == EXCEPTION) {
 269     PrintDebug("[injecting_intr] Exception\n");
 270     intr_state->excp_pending = 0;
 271     intr_state->excp_num = 0;
 272     intr_state->excp_error_code = 0;
 273     intr_state->excp_error_code_valid = 0;
 274
 275   } else if (type == EXTERNAL_IRQ) {
 276     PrintDebug("[injecting_intr] External_Irq with intr_num = %x\n", intr_num);
 277     return intr_state->controller->begin_irq(intr_state->controller_state, intr_num);
 278   }
 279
 280   return 0;
 281 }