1/* 2 * Copyright 2003-2011, Haiku, Inc. All rights reserved. 3 * Distributed under the terms of the MIT License. 4 * 5 * Authors: 6 * Axel D��rfler <axeld@pinc-software.de> 7 * Ingo Weinhold <bonefish@cs.tu-berlin.de> 8 * Fran��ois 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 <string.h> 18 19#include <arch_cpu.h> 20#include <arch/thread.h> 21#include <boot/stage2.h> 22#include <kernel.h> 23#include <thread.h> 24#include <vm/vm_types.h> 25#include <vm/VMAddressSpace.h> 26#include <arch_vm.h> 27//#include <arch/vm_translation_map.h> 28 29#include "paging/M68KPagingMethod.h" 30#include "paging/M68KPagingStructures.h" 31#include "paging/M68KVMTranslationMap.h" 32 33 34#warning M68K: writeme! 35// Valid initial arch_thread state. We just memcpy() it when initializing 36// a new thread structure. 37static struct arch_thread sInitialState; 38 39Thread *gCurrentThread; 40 41// Helper function for thread creation, defined in arch_asm.S. 42extern "C" void m68k_kernel_thread_root(); 43 44 45void 46m68k_push_iframe(struct iframe_stack *stack, struct iframe *frame) 47{ 48 ASSERT(stack->index < IFRAME_TRACE_DEPTH); 49 stack->frames[stack->index++] = frame; 50} 51 52 53void 54m68k_pop_iframe(struct iframe_stack *stack) 55{ 56 ASSERT(stack->index > 0); 57 stack->index--; 58} 59 60 61/** Returns the current iframe structure of the running thread. 62 * This function must only be called in a context where it's actually 63 * sure that such iframe exists; ie. from syscalls, but usually not 64 * from standard kernel threads. 65 */ 66static struct iframe * 67m68k_get_current_iframe(void) 68{ 69 Thread *thread = thread_get_current_thread(); 70 71 ASSERT(thread->arch_info.iframes.index >= 0); 72 return thread->arch_info.iframes.frames[thread->arch_info.iframes.index - 1]; 73} 74 75 76/** \brief Returns the current thread's topmost (i.e. most recent) 77 * userland->kernel transition iframe (usually the first one, save for 78 * interrupts in signal handlers). 79 * \return The iframe, or \c NULL, if there is no such iframe (e.g. when 80 * the thread is a kernel thread). 81 */ 82struct iframe * 83m68k_get_user_iframe(void) 84{ 85 Thread *thread = thread_get_current_thread(); 86 int i; 87 88 for (i = thread->arch_info.iframes.index - 1; i >= 0; i--) { 89 struct iframe *frame = thread->arch_info.iframes.frames[i]; 90 if ((frame->cpu.sr & (1 << M68K_SR_S)) == 0) 91 return frame; 92 } 93 94 return NULL; 95} 96 97 98uint32 99m68k_next_page_directory(Thread *from, Thread *to) 100{ 101 VMAddressSpace* toAddressSpace = to->team->address_space; 102 if (from->team->address_space == toAddressSpace) { 103 // don't change the pgdir, same address space 104 return 0; 105 } 106 107 if (toAddressSpace == NULL) 108 toAddressSpace = VMAddressSpace::Kernel(); 109 110 return static_cast<M68KVMTranslationMap*>(toAddressSpace->TranslationMap()) 111 ->PagingStructures()->pgroot_phys; 112} 113 114// #pragma mark - 115 116 117status_t 118arch_thread_init(struct kernel_args *args) 119{ 120 // Initialize the static initial arch_thread state (sInitialState). 121 // Currently nothing to do, i.e. zero initialized is just fine. 122 123 return B_OK; 124} 125 126 127status_t 128arch_team_init_team_struct(Team *team, bool kernel) 129{ 130 // Nothing to do. The structure is empty. 131 return B_OK; 132} 133 134 135status_t 136arch_thread_init_thread_struct(Thread *thread) 137{ 138 // set up an initial state (stack & fpu) 139 memcpy(&thread->arch_info, &sInitialState, sizeof(struct arch_thread)); 140 141 return B_OK; 142} 143 144 145void 146arch_thread_init_kthread_stack(Thread* thread, void* _stack, void* _stackTop, 147 void (*function)(void*), const void* data) 148{ 149#if 0 150 addr_t *kstack = (addr_t *)t->kernel_stack_base; 151 addr_t *kstackTop = (addr_t *)t->kernel_stack_base; 152 153 // clear the kernel stack 154#ifdef DEBUG_KERNEL_STACKS 155# ifdef STACK_GROWS_DOWNWARDS 156 memset((void *)((addr_t)kstack + KERNEL_STACK_GUARD_PAGES * B_PAGE_SIZE), 0, 157 KERNEL_STACK_SIZE); 158# else 159 memset(kstack, 0, KERNEL_STACK_SIZE); 160# endif 161#else 162 memset(kstack, 0, KERNEL_STACK_SIZE); 163#endif 164 165 // space for frame pointer and return address, and stack frames must be 166 // 16 byte aligned 167 kstackTop -= 2; 168 kstackTop = (addr_t*)((addr_t)kstackTop & ~0xf); 169 170 // LR, CR, r2, r13-r31, f13-f31, as pushed by m68k_context_switch() 171 kstackTop -= 22 + 2 * 19; 172 173 // let LR point to m68k_kernel_thread_root() 174 kstackTop[0] = (addr_t)&m68k_kernel_thread_root; 175 176 // the arguments of m68k_kernel_thread_root() are the functions to call, 177 // provided in registers r13-r15 178 kstackTop[3] = (addr_t)entry_func; 179 kstackTop[4] = (addr_t)start_func; 180 kstackTop[5] = (addr_t)exit_func; 181 182 // save this stack position 183 t->arch_info.sp = (void *)kstackTop; 184 185 return B_OK; 186#else 187 panic("arch_thread_init_kthread_stack(): Implement me!"); 188#endif 189} 190 191 192status_t 193arch_thread_init_tls(Thread *thread) 194{ 195 // TODO: Implement! 196 return B_OK; 197} 198 199 200void 201arch_thread_context_switch(Thread *from, 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 210 211 //m68k_set_pgdir((void *)newPageDirectory); 212 gM68KPagingMethod->SetPageRoot(newPageDirectory); 213 214 m68k_context_switch(&from->arch_info.sp, to->arch_info.sp); 215} 216 217 218void 219arch_thread_dump_info(void *info) 220{ 221 struct arch_thread *at = (struct arch_thread *)info; 222 223 dprintf("\tsp: %p\n", at->sp); 224} 225 226 227status_t 228arch_thread_enter_userspace(Thread *thread, addr_t entry, void *arg1, void *arg2) 229{ 230 panic("arch_thread_enter_uspace(): not yet implemented\n"); 231 return B_ERROR; 232} 233 234 235bool 236arch_on_signal_stack(Thread *thread) 237{ 238 return false; 239} 240 241 242status_t 243arch_setup_signal_frame(Thread *thread, struct sigaction *sa, 244 struct signal_frame_data *signalFrameData) 245{ 246 return B_ERROR; 247} 248 249 250int64 251arch_restore_signal_frame(struct signal_frame_data* signalFrameData) 252{ 253 return 0; 254} 255 256 257/** Saves everything needed to restore the frame in the child fork in the 258 * arch_fork_arg structure to be passed to arch_restore_fork_frame(). 259 * Also makes sure to return the right value. 260 */ 261 262void 263arch_store_fork_frame(struct arch_fork_arg *arg) 264{ 265} 266 267 268/** Restores the frame from a forked team as specified by the provided 269 * arch_fork_arg structure. 270 * Needs to be called from within the child team, ie. instead of 271 * arch_thread_enter_uspace() as thread "starter". 272 * This function does not return to the caller, but will enter userland 273 * in the child team at the same position where the parent team left of. 274 */ 275 276void 277arch_restore_fork_frame(struct arch_fork_arg *arg) 278{ 279} 280 281