palacios/src/palacios/vmm_intr.c

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