1 /* 2 * Copyright 2003-2007, 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 #include <arch_thread.h> 15 16 #include <arch_cpu.h> 17 #include <arch/thread.h> 18 #include <boot/stage2.h> 19 #include <kernel.h> 20 #include <thread.h> 21 #include <vm_address_space.h> 22 #include <vm_types.h> 23 #include <arch_vm.h> 24 //#include <arch/vm_translation_map.h> 25 26 #include <string.h> 27 28 #warning M68K: writeme! 29 // Valid initial arch_thread state. We just memcpy() it when initializing 30 // a new thread structure. 31 static struct arch_thread sInitialState; 32 33 struct thread *gCurrentThread; 34 35 // Helper function for thread creation, defined in arch_asm.S. 36 extern "C" void m68k_kernel_thread_root(); 37 38 extern "C" void m68k_switch_stack_and_call(addr_t newKstack, 39 void (*func)(void *), void *arg); 40 41 42 void 43 m68k_push_iframe(struct iframe_stack *stack, struct iframe *frame) 44 { 45 ASSERT(stack->index < IFRAME_TRACE_DEPTH); 46 stack->frames[stack->index++] = frame; 47 } 48 49 50 void 51 m68k_pop_iframe(struct iframe_stack *stack) 52 { 53 ASSERT(stack->index > 0); 54 stack->index--; 55 } 56 57 58 /** Returns the current iframe structure of the running thread. 59 * This function must only be called in a context where it's actually 60 * sure that such iframe exists; ie. from syscalls, but usually not 61 * from standard kernel threads. 62 */ 63 static struct iframe * 64 m68k_get_current_iframe(void) 65 { 66 struct thread *thread = thread_get_current_thread(); 67 68 ASSERT(thread->arch_info.iframes.index >= 0); 69 return thread->arch_info.iframes.frames[thread->arch_info.iframes.index - 1]; 70 } 71 72 73 /** \brief Returns the current thread's topmost (i.e. most recent) 74 * userland->kernel transition iframe (usually the first one, save for 75 * interrupts in signal handlers). 76 * \return The iframe, or \c NULL, if there is no such iframe (e.g. when 77 * the thread is a kernel thread). 78 */ 79 struct iframe * 80 m68k_get_user_iframe(void) 81 { 82 struct thread *thread = thread_get_current_thread(); 83 int i; 84 85 for (i = thread->arch_info.iframes.index - 1; i >= 0; i--) { 86 struct iframe *frame = thread->arch_info.iframes.frames[i]; 87 if (frame->cpu.sr & (1 << M68K_SR_S) == 0) 88 return frame; 89 } 90 91 return NULL; 92 } 93 94 95 void * 96 m68k_next_page_directory(struct thread *from, struct thread *to) 97 { 98 if (from->team->address_space != NULL && to->team->address_space != NULL) { 99 // they are both user space threads 100 if (from->team == to->team) { 101 // dont change the pgdir, same address space 102 return NULL; 103 } 104 // switching to a new address space 105 return m68k_translation_map_get_pgdir(&to->team->address_space->translation_map); 106 } else if (from->team->address_space == NULL && to->team->address_space == NULL) { 107 // they must both be kernel space threads 108 return NULL; 109 } else if (to->team->address_space == NULL) { 110 // the one we're switching to is kernel space 111 return m68k_translation_map_get_pgdir(&vm_kernel_address_space()->translation_map); 112 } 113 114 return m68k_translation_map_get_pgdir(&to->team->address_space->translation_map); 115 } 116 117 // #pragma mark - 118 119 120 status_t 121 arch_thread_init(struct kernel_args *args) 122 { 123 // Initialize the static initial arch_thread state (sInitialState). 124 // Currently nothing to do, i.e. zero initialized is just fine. 125 126 return B_OK; 127 } 128 129 130 status_t 131 arch_team_init_team_struct(struct team *team, bool kernel) 132 { 133 // Nothing to do. The structure is empty. 134 return B_OK; 135 } 136 137 138 status_t 139 arch_thread_init_thread_struct(struct thread *thread) 140 { 141 // set up an initial state (stack & fpu) 142 memcpy(&thread->arch_info, &sInitialState, sizeof(struct arch_thread)); 143 144 return B_OK; 145 } 146 147 148 status_t 149 arch_thread_init_kthread_stack(struct thread *t, int (*start_func)(void), 150 void (*entry_func)(void), void (*exit_func)(void)) 151 { 152 addr_t *kstack = (addr_t *)t->kernel_stack_base; 153 addr_t *kstackTop = (addr_t *)t->kernel_stack_base; 154 155 // clear the kernel stack 156 #ifdef DEBUG_KERNEL_STACKS 157 # ifdef STACK_GROWS_DOWNWARDS 158 memset((void *)((addr_t)kstack + KERNEL_STACK_GUARD_PAGES * B_PAGE_SIZE), 0, 159 KERNEL_STACK_SIZE); 160 # else 161 memset(kstack, 0, KERNEL_STACK_SIZE); 162 # endif 163 #else 164 memset(kstack, 0, KERNEL_STACK_SIZE); 165 #endif 166 167 // space for frame pointer and return address, and stack frames must be 168 // 16 byte aligned 169 kstackTop -= 2; 170 kstackTop = (addr_t*)((addr_t)kstackTop & ~0xf); 171 172 // LR, CR, r2, r13-r31, f13-f31, as pushed by m68k_context_switch() 173 kstackTop -= 22 + 2 * 19; 174 175 // let LR point to m68k_kernel_thread_root() 176 kstackTop[0] = (addr_t)&m68k_kernel_thread_root; 177 178 // the arguments of m68k_kernel_thread_root() are the functions to call, 179 // provided in registers r13-r15 180 kstackTop[3] = (addr_t)entry_func; 181 kstackTop[4] = (addr_t)start_func; 182 kstackTop[5] = (addr_t)exit_func; 183 184 // save this stack position 185 t->arch_info.sp = (void *)kstackTop; 186 187 return B_OK; 188 } 189 190 191 status_t 192 arch_thread_init_tls(struct thread *thread) 193 { 194 // TODO: Implement! 195 return B_OK; 196 } 197 198 199 void 200 arch_thread_switch_kstack_and_call(struct thread *t, addr_t newKstack, 201 void (*func)(void *), void *arg) 202 { 203 m68k_switch_stack_and_call(newKstack, func, arg); 204 } 205 206 207 void 208 arch_thread_context_switch(struct thread *from, struct thread *to) 209 { 210 addr_t newPageDirectory; 211 212 newPageDirectory = (addr_t)m68k_next_page_directory(from, to); 213 214 if ((newPageDirectory % B_PAGE_SIZE) != 0) 215 panic("arch_thread_context_switch: bad pgdir 0x%lx\n", newPageDirectory); 216 #warning M68K: export from arch_vm.c 217 m68k_set_pgdir((void *)newPageDirectory); 218 m68k_context_switch(&from->arch_info.sp, to->arch_info.sp); 219 } 220 221 222 void 223 arch_thread_dump_info(void *info) 224 { 225 struct arch_thread *at = (struct arch_thread *)info; 226 227 dprintf("\tsp: %p\n", at->sp); 228 } 229 230 231 status_t 232 arch_thread_enter_userspace(struct thread *thread, addr_t entry, void *arg1, void *arg2) 233 { 234 panic("arch_thread_enter_uspace(): not yet implemented\n"); 235 return B_ERROR; 236 } 237 238 239 bool 240 arch_on_signal_stack(struct thread *thread) 241 { 242 return false; 243 } 244 245 246 status_t 247 arch_setup_signal_frame(struct thread *thread, struct sigaction *sa, int sig, int sigMask) 248 { 249 return B_ERROR; 250 } 251 252 253 int64 254 arch_restore_signal_frame(void) 255 { 256 return 0; 257 } 258 259 260 void 261 arch_check_syscall_restart(struct thread *thread) 262 { 263 } 264 265 266 /** Saves everything needed to restore the frame in the child fork in the 267 * arch_fork_arg structure to be passed to arch_restore_fork_frame(). 268 * Also makes sure to return the right value. 269 */ 270 271 void 272 arch_store_fork_frame(struct arch_fork_arg *arg) 273 { 274 } 275 276 277 /** Restores the frame from a forked team as specified by the provided 278 * arch_fork_arg structure. 279 * Needs to be called from within the child team, ie. instead of 280 * arch_thread_enter_uspace() as thread "starter". 281 * This function does not return to the caller, but will enter userland 282 * in the child team at the same position where the parent team left of. 283 */ 284 285 void 286 arch_restore_fork_frame(struct arch_fork_arg *arg) 287 { 288 } 289 290