1 /* 2 * Copyright 2003-2010, 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 * 10 * Copyright 2001, Travis Geiselbrecht. All rights reserved. 11 * Distributed under the terms of the NewOS License. 12 */ 13 14 15 #include <arch_thread.h> 16 17 #include <arch_cpu.h> 18 #include <arch/thread.h> 19 #include <boot/stage2.h> 20 #include <kernel.h> 21 #include <thread.h> 22 #include <vm/vm_types.h> 23 #include <vm/VMAddressSpace.h> 24 #include <arch_vm.h> 25 //#include <arch/vm_translation_map.h> 26 27 #include <string.h> 28 29 #warning M68K: writeme! 30 // Valid initial arch_thread state. We just memcpy() it when initializing 31 // a new thread structure. 32 static struct arch_thread sInitialState; 33 34 struct thread *gCurrentThread; 35 36 // Helper function for thread creation, defined in arch_asm.S. 37 extern "C" void m68k_kernel_thread_root(); 38 39 40 void 41 m68k_push_iframe(struct iframe_stack *stack, struct iframe *frame) 42 { 43 ASSERT(stack->index < IFRAME_TRACE_DEPTH); 44 stack->frames[stack->index++] = frame; 45 } 46 47 48 void 49 m68k_pop_iframe(struct iframe_stack *stack) 50 { 51 ASSERT(stack->index > 0); 52 stack->index--; 53 } 54 55 56 /** Returns the current iframe structure of the running thread. 57 * This function must only be called in a context where it's actually 58 * sure that such iframe exists; ie. from syscalls, but usually not 59 * from standard kernel threads. 60 */ 61 static struct iframe * 62 m68k_get_current_iframe(void) 63 { 64 struct thread *thread = thread_get_current_thread(); 65 66 ASSERT(thread->arch_info.iframes.index >= 0); 67 return thread->arch_info.iframes.frames[thread->arch_info.iframes.index - 1]; 68 } 69 70 71 /** \brief Returns the current thread's topmost (i.e. most recent) 72 * userland->kernel transition iframe (usually the first one, save for 73 * interrupts in signal handlers). 74 * \return The iframe, or \c NULL, if there is no such iframe (e.g. when 75 * the thread is a kernel thread). 76 */ 77 struct iframe * 78 m68k_get_user_iframe(void) 79 { 80 struct thread *thread = thread_get_current_thread(); 81 int i; 82 83 for (i = thread->arch_info.iframes.index - 1; i >= 0; i--) { 84 struct iframe *frame = thread->arch_info.iframes.frames[i]; 85 if (frame->cpu.sr & (1 << M68K_SR_S) == 0) 86 return frame; 87 } 88 89 return NULL; 90 } 91 92 93 void * 94 m68k_next_page_directory(struct thread *from, struct thread *to) 95 { 96 if (from->team->address_space != NULL && to->team->address_space != NULL) { 97 // they are both user space threads 98 if (from->team == to->team) { 99 // dont change the pgdir, same address space 100 return NULL; 101 } 102 // switching to a new address space 103 return m68k_translation_map_get_pgdir( 104 &to->team->address_space->TranslationMap()); 105 } else if (from->team->address_space == NULL && to->team->address_space == NULL) { 106 // they must both be kernel space threads 107 return NULL; 108 } else if (to->team->address_space == NULL) { 109 // the one we're switching to is kernel space 110 return m68k_translation_map_get_pgdir( 111 &VMAddressSpace::Kernel()->TranslationMap()); 112 } 113 114 return m68k_translation_map_get_pgdir( 115 &to->team->address_space->TranslationMap()); 116 } 117 118 // #pragma mark - 119 120 121 status_t 122 arch_thread_init(struct kernel_args *args) 123 { 124 // Initialize the static initial arch_thread state (sInitialState). 125 // Currently nothing to do, i.e. zero initialized is just fine. 126 127 return B_OK; 128 } 129 130 131 status_t 132 arch_team_init_team_struct(struct team *team, bool kernel) 133 { 134 // Nothing to do. The structure is empty. 135 return B_OK; 136 } 137 138 139 status_t 140 arch_thread_init_thread_struct(struct thread *thread) 141 { 142 // set up an initial state (stack & fpu) 143 memcpy(&thread->arch_info, &sInitialState, sizeof(struct arch_thread)); 144 145 return B_OK; 146 } 147 148 149 status_t 150 arch_thread_init_kthread_stack(struct thread *t, int (*start_func)(void), 151 void (*entry_func)(void), void (*exit_func)(void)) 152 { 153 addr_t *kstack = (addr_t *)t->kernel_stack_base; 154 addr_t *kstackTop = (addr_t *)t->kernel_stack_base; 155 156 // clear the kernel stack 157 #ifdef DEBUG_KERNEL_STACKS 158 # ifdef STACK_GROWS_DOWNWARDS 159 memset((void *)((addr_t)kstack + KERNEL_STACK_GUARD_PAGES * B_PAGE_SIZE), 0, 160 KERNEL_STACK_SIZE); 161 # else 162 memset(kstack, 0, KERNEL_STACK_SIZE); 163 # endif 164 #else 165 memset(kstack, 0, KERNEL_STACK_SIZE); 166 #endif 167 168 // space for frame pointer and return address, and stack frames must be 169 // 16 byte aligned 170 kstackTop -= 2; 171 kstackTop = (addr_t*)((addr_t)kstackTop & ~0xf); 172 173 // LR, CR, r2, r13-r31, f13-f31, as pushed by m68k_context_switch() 174 kstackTop -= 22 + 2 * 19; 175 176 // let LR point to m68k_kernel_thread_root() 177 kstackTop[0] = (addr_t)&m68k_kernel_thread_root; 178 179 // the arguments of m68k_kernel_thread_root() are the functions to call, 180 // provided in registers r13-r15 181 kstackTop[3] = (addr_t)entry_func; 182 kstackTop[4] = (addr_t)start_func; 183 kstackTop[5] = (addr_t)exit_func; 184 185 // save this stack position 186 t->arch_info.sp = (void *)kstackTop; 187 188 return B_OK; 189 } 190 191 192 status_t 193 arch_thread_init_tls(struct thread *thread) 194 { 195 // TODO: Implement! 196 return B_OK; 197 } 198 199 200 void 201 arch_thread_context_switch(struct thread *from, struct thread *to) 202 { 203 addr_t newPageDirectory; 204 205 newPageDirectory = (addr_t)m68k_next_page_directory(from, to); 206 207 if ((newPageDirectory % B_PAGE_SIZE) != 0) 208 panic("arch_thread_context_switch: bad pgdir 0x%lx\n", newPageDirectory); 209 #warning M68K: export from arch_vm.c 210 m68k_set_pgdir((void *)newPageDirectory); 211 m68k_context_switch(&from->arch_info.sp, to->arch_info.sp); 212 } 213 214 215 void 216 arch_thread_dump_info(void *info) 217 { 218 struct arch_thread *at = (struct arch_thread *)info; 219 220 dprintf("\tsp: %p\n", at->sp); 221 } 222 223 224 status_t 225 arch_thread_enter_userspace(struct thread *thread, addr_t entry, void *arg1, void *arg2) 226 { 227 panic("arch_thread_enter_uspace(): not yet implemented\n"); 228 return B_ERROR; 229 } 230 231 232 bool 233 arch_on_signal_stack(struct thread *thread) 234 { 235 return false; 236 } 237 238 239 status_t 240 arch_setup_signal_frame(struct thread *thread, struct sigaction *sa, int sig, int sigMask) 241 { 242 return B_ERROR; 243 } 244 245 246 int64 247 arch_restore_signal_frame(void) 248 { 249 return 0; 250 } 251 252 253 void 254 arch_check_syscall_restart(struct thread *thread) 255 { 256 } 257 258 259 /** Saves everything needed to restore the frame in the child fork in the 260 * arch_fork_arg structure to be passed to arch_restore_fork_frame(). 261 * Also makes sure to return the right value. 262 */ 263 264 void 265 arch_store_fork_frame(struct arch_fork_arg *arg) 266 { 267 } 268 269 270 /** Restores the frame from a forked team as specified by the provided 271 * arch_fork_arg structure. 272 * Needs to be called from within the child team, ie. instead of 273 * arch_thread_enter_uspace() as thread "starter". 274 * This function does not return to the caller, but will enter userland 275 * in the child team at the same position where the parent team left of. 276 */ 277 278 void 279 arch_restore_fork_frame(struct arch_fork_arg *arg) 280 { 281 } 282 283