1 /* 2 * Copyright 2003-2012, Haiku Inc. All rights reserved. 3 * Distributed under the terms of the MIT License. 4 * 5 * Authors: 6 * Axel Dörfler <axeld@pinc-software.de> 7 * Ingo Weinhold <bonefish@cs.tu-berlin.de> 8 * François Revol <revol@free.fr> 9 * Ithamar R. Adema <ithamar@upgrade-android.com> 10 * 11 * Copyright 2001, Travis Geiselbrecht. All rights reserved. 12 * Distributed under the terms of the NewOS License. 13 */ 14 15 16 #include <int.h> 17 18 #include <arch/smp.h> 19 #include <boot/kernel_args.h> 20 #include <device_manager.h> 21 #include <kscheduler.h> 22 #include <interrupt_controller.h> 23 #include <smp.h> 24 #include <thread.h> 25 #include <timer.h> 26 #include <util/DoublyLinkedList.h> 27 #include <util/kernel_cpp.h> 28 #include <vm/vm.h> 29 #include <vm/vm_priv.h> 30 #include <vm/VMAddressSpace.h> 31 #include <string.h> 32 33 34 //#define TRACE_ARCH_INT 35 #ifdef TRACE_ARCH_INT 36 # define TRACE(x) dprintf x 37 #else 38 # define TRACE(x) ; 39 #endif 40 41 #define VECTORPAGE_SIZE 64 42 #define USER_VECTOR_ADDR_LOW 0x00000000 43 #define USER_VECTOR_ADDR_HIGH 0xffff0000 44 45 #define PXA_INTERRUPT_PHYS_BASE 0x40D00000 46 #define PXA_INTERRUPT_SIZE 0x00000034 47 48 #define PXA_ICIP 0x00 49 #define PXA_ICMR 0x01 50 #define PXA_ICFP 0x03 51 #define PXA_ICMR2 0x28 52 53 static area_id sPxaInterruptArea; 54 static uint32 *sPxaInterruptBase; 55 56 extern int _vectors_start; 57 extern int _vectors_end; 58 59 static area_id sVectorPageArea; 60 static void *sVectorPageAddress; 61 static area_id sUserVectorPageArea; 62 static void *sUserVectorPageAddress; 63 64 // An iframe stack used in the early boot process when we don't have 65 // threads yet. 66 struct iframe_stack gBootFrameStack; 67 68 69 void 70 arch_int_enable_io_interrupt(int irq) 71 { 72 TRACE(("arch_int_enable_io_interrupt(%d)\n", irq)); 73 74 if (irq <= 31) { 75 sPxaInterruptBase[PXA_ICMR] |= 1 << irq; 76 return; 77 } 78 79 sPxaInterruptBase[PXA_ICMR2] |= 1 << (irq - 32); 80 } 81 82 83 void 84 arch_int_disable_io_interrupt(int irq) 85 { 86 TRACE(("arch_int_disable_io_interrupt(%d)\n", irq)); 87 88 if (irq <= 31) { 89 sPxaInterruptBase[PXA_ICMR] &= ~(1 << irq); 90 return; 91 } 92 93 sPxaInterruptBase[PXA_ICMR2] &= ~(1 << (irq - 32)); 94 } 95 96 97 /* arch_int_*_interrupts() and friends are in arch_asm.S */ 98 99 100 static void 101 print_iframe(const char *event, struct iframe *frame) 102 { 103 if (event) 104 dprintf("Exception: %s\n", event); 105 106 dprintf("R00=%08lx R01=%08lx R02=%08lx R03=%08lx\n" 107 "R04=%08lx R05=%08lx R06=%08lx R07=%08lx\n", 108 frame->r0, frame->r1, frame->r2, frame->r3, 109 frame->r4, frame->r5, frame->r6, frame->r7); 110 dprintf("R08=%08lx R09=%08lx R10=%08lx R11=%08lx\n" 111 "R12=%08lx R13=%08lx R14=%08lx CPSR=%08lx\n", 112 frame->r8, frame->r9, frame->r10, frame->r11, 113 frame->r12, frame->usr_sp, frame->usr_lr, frame->spsr); 114 } 115 116 117 status_t 118 arch_int_init(kernel_args *args) 119 { 120 return B_OK; 121 } 122 123 124 extern "C" void arm_vector_init(void); 125 126 127 status_t 128 arch_int_init_post_vm(kernel_args *args) 129 { 130 // create a read/write kernel area 131 sVectorPageArea = create_area("vectorpage", (void **)&sVectorPageAddress, 132 B_ANY_ADDRESS, VECTORPAGE_SIZE, B_FULL_LOCK, 133 B_KERNEL_WRITE_AREA | B_KERNEL_READ_AREA); 134 135 if (sVectorPageArea < 0) 136 panic("vector page could not be created!"); 137 138 // clone it at a fixed address with user read/only permissions 139 sUserVectorPageAddress = (addr_t*)USER_VECTOR_ADDR_HIGH; 140 sUserVectorPageArea = clone_area("user_vectorpage", 141 (void **)&sUserVectorPageAddress, B_EXACT_ADDRESS, 142 B_READ_AREA | B_EXECUTE_AREA, sVectorPageArea); 143 144 if (sUserVectorPageArea < 0) 145 panic("user vector page @ %p could not be created (%lx)!", sVectorPageAddress, sUserVectorPageArea); 146 147 // copy vectors into the newly created area 148 memcpy(sVectorPageAddress, &_vectors_start, VECTORPAGE_SIZE); 149 150 arm_vector_init(); 151 152 // see if high vectors are enabled 153 if ((mmu_read_c1() & (1 << 13)) != 0) 154 dprintf("High vectors already enabled\n"); 155 else { 156 mmu_write_c1(mmu_read_c1() | (1 << 13)); 157 158 if ((mmu_read_c1() & (1 << 13)) == 0) 159 dprintf("Unable to enable high vectors!\n"); 160 else 161 dprintf("Enabled high vectors\n"); 162 } 163 164 sPxaInterruptArea = map_physical_memory("pxa_intc", PXA_INTERRUPT_PHYS_BASE, 165 PXA_INTERRUPT_SIZE, 0, B_KERNEL_READ_AREA | B_KERNEL_WRITE_AREA, (void**)&sPxaInterruptBase); 166 167 if (sPxaInterruptArea < 0) 168 return sPxaInterruptArea; 169 170 sPxaInterruptBase[PXA_ICMR] = 0; 171 sPxaInterruptBase[PXA_ICMR2] = 0; 172 173 return B_OK; 174 } 175 176 177 status_t 178 arch_int_init_io(kernel_args* args) 179 { 180 return B_OK; 181 } 182 183 184 status_t 185 arch_int_init_post_device_manager(struct kernel_args *args) 186 { 187 return B_ENTRY_NOT_FOUND; 188 } 189 190 191 extern "C" void 192 arch_arm_undefined(struct iframe *iframe) 193 { 194 print_iframe("Undefined Instruction", iframe); 195 panic("not handled!"); 196 } 197 198 199 extern "C" void 200 arch_arm_syscall(struct iframe *iframe) 201 { 202 print_iframe("Software interrupt", iframe); 203 } 204 205 206 extern "C" void 207 arch_arm_data_abort(struct iframe *frame) 208 { 209 Thread *thread = thread_get_current_thread(); 210 bool isUser = (frame->spsr & 0x1f) == 0x10; 211 addr_t far = arm_get_far(); 212 bool isWrite = true; 213 addr_t newip = 0; 214 215 #ifdef TRACE_ARCH_INT 216 print_iframe("Data Abort", frame); 217 #endif 218 219 if (debug_debugger_running()) { 220 // If this CPU or this thread has a fault handler, we're allowed to be 221 // here. 222 if (thread != NULL) { 223 cpu_ent* cpu = &gCPU[smp_get_current_cpu()]; 224 225 if (cpu->fault_handler != 0) { 226 debug_set_page_fault_info(far, frame->pc, 227 isWrite ? DEBUG_PAGE_FAULT_WRITE : 0); 228 frame->svc_sp = cpu->fault_handler_stack_pointer; 229 frame->pc = cpu->fault_handler; 230 return; 231 } 232 233 if (thread->fault_handler != 0) { 234 kprintf("ERROR: thread::fault_handler used in kernel " 235 "debugger!\n"); 236 debug_set_page_fault_info(far, frame->pc, 237 isWrite ? DEBUG_PAGE_FAULT_WRITE : 0); 238 frame->pc = thread->fault_handler; 239 return; 240 } 241 } 242 243 // otherwise, not really 244 panic("page fault in debugger without fault handler! Touching " 245 "address %p from pc %p\n", (void *)far, (void *)frame->pc); 246 return; 247 } else if ((frame->spsr & (1 << 7)) != 0) { 248 // interrupts disabled 249 250 // If a page fault handler is installed, we're allowed to be here. 251 // TODO: Now we are generally allowing user_memcpy() with interrupts 252 // disabled, which in most cases is a bug. We should add some thread 253 // flag allowing to explicitly indicate that this handling is desired. 254 if (thread && thread->fault_handler != 0) { 255 if (frame->pc != thread->fault_handler) { 256 frame->pc = thread->fault_handler; 257 return; 258 } 259 260 // The fault happened at the fault handler address. This is a 261 // certain infinite loop. 262 panic("page fault, interrupts disabled, fault handler loop. " 263 "Touching address %p from pc %p\n", (void*)far, 264 (void*)frame->pc); 265 } 266 267 // If we are not running the kernel startup the page fault was not 268 // allowed to happen and we must panic. 269 panic("page fault, but interrupts were disabled. Touching address " 270 "%p from pc %p\n", (void *)far, (void *)frame->pc); 271 return; 272 } else if (thread != NULL && thread->page_faults_allowed < 1) { 273 panic("page fault not allowed at this place. Touching address " 274 "%p from pc %p\n", (void *)far, (void *)frame->pc); 275 return; 276 } 277 278 enable_interrupts(); 279 280 vm_page_fault(far, frame->pc, isWrite, isUser, &newip); 281 282 if (newip != 0) { 283 // the page fault handler wants us to modify the iframe to set the 284 // IP the cpu will return to to be this ip 285 frame->pc = newip; 286 } 287 } 288 289 290 extern "C" void 291 arch_arm_prefetch_abort(struct iframe *iframe) 292 { 293 print_iframe("Prefetch Abort", iframe); 294 panic("not handled!"); 295 } 296 297 298 extern "C" void 299 arch_arm_irq(struct iframe *iframe) 300 { 301 for (int i=0; i < 32; i++) { 302 if (sPxaInterruptBase[PXA_ICIP] & (1 << i)) 303 int_io_interrupt_handler(i, true); 304 } 305 } 306 307 308 extern "C" void 309 arch_arm_fiq(struct iframe *iframe) 310 { 311 for (int i=0; i < 32; i++) { 312 if (sPxaInterruptBase[PXA_ICIP] & (1 << i)) { 313 dprintf("arch_arm_fiq: help me, FIQ %d was triggered but no " 314 "FIQ support!\n", i); 315 } 316 } 317 } 318