88 lines
3.0 KiB
C++
88 lines
3.0 KiB
C++
// vim: set noet ts=4 sw=4:
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#include "thread.h"
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#include "../arch/core_ring.h"
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#include "../memory/pageframealloc.h"
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#include "../memory/pagetable.h"
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#include "../memory/page.h"
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#include "../debug/kernelpanic.h"
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#include "../interrupt/guard.h"
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#include "debug/output.h"
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static int idCounter = 1; // counter for task IDs
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//extern four_lvl_paging_t paging_tree;
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extern pagetable_t identity_table;
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void Thread::kickoff(uintptr_t param1, uintptr_t param2, uintptr_t param3) {
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Thread *thread = reinterpret_cast<Thread *>(param1);
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assert(thread != nullptr && "Kickoff got nullptr pointer to Thread");
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(void)param3; // will be used later
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// The core must have entered level 1/2 to cause a thread to be scheduled.
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Guard::leave();
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if(!thread->isKernel)
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Core::Ring::switchToUsermode(thread->StackPointer.user, thread->start, (void*)param2);
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else
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if(thread->start == nullptr)
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thread->action();
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else
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((void(*)())thread->start)();
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}
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void Thread::load_paging(Thread* t){
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load_cr3((void*)(t->paging_tree->l4));
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}
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void Thread::map_app(void* code_paddr, uint16_t code_page_num, void* stack_vaddr, uint16_t stack_page_num){
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paging_tree = (four_lvl_paging_t*)PageFrameAllocator::alloc(true);
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memset(paging_tree, 0, 4096);
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create_basic_page_table(paging_tree, &identity_table);
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// insert app code pages at 0x4000000
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for(uintptr_t i=0; i<(code_page_num*4096); i+=4096){
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setMapping(0x4000000+i, (void*)((uintptr_t)code_paddr+i), paging_tree);
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}
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for(uintptr_t i=0; i<(stack_page_num*4096); i+=4096){
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uintptr_t user_stackframe_p = ((uintptr_t)PageFrameAllocator::alloc(false));
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setMapping((uintptr_t)(stack_vaddr)+i, (void*)((uintptr_t)user_stackframe_p), paging_tree);
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}
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}
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Thread::Thread (bool kernel, void* start_addr, void * codeframe, int code_frame_num): queue_link(nullptr), isKernel(kernel), start(start_addr), code_paddr(codeframe), code_pagenum(code_frame_num), id(idCounter++), kill_flag(false){
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StackPointer.isr = reinterpret_cast<void *>((uintptr_t)PageFrameAllocator::alloc(true)+STACK_SIZE);// mapped due to identity mapping
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StackPointer.user = (void*)(0x6000000+STACK_SIZE);
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map_app(codeframe, code_frame_num, (void*)((uintptr_t)StackPointer.user-STACK_SIZE), 1);
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prepareContext(StackPointer.isr, context, kickoff, reinterpret_cast<uintptr_t>(this), 0, 0);
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}
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Thread::Thread() : Thread(false, 0) {}
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//Thread::Thread() : queue_link(nullptr), id(idCounter++), kill_flag(false) {
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// void *tos = reinterpret_cast<void *>(reserved_stack_space_isr + STACK_SIZE);
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// prepareContext(tos, context, kickoff, reinterpret_cast<uintptr_t>(this), 0, 0);
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//}
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void Thread::resume(Thread *next) {
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load_paging(next);
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context_switch(&next->context, &context);
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}
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void* Thread::operator new(size_t sz) noexcept
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{
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if (sz == 0)
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++sz; // avoid std::malloc(0) which may return nullptr on success
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void *ptr = PageFrameAllocator::alloc(true);
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return ptr;
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}
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void Thread::go() {
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load_paging(this);
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context_launch(&context);
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}
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void Thread::action() { kernelpanic("Wrong entry / missing action in Thread"); }
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