137 lines
2.8 KiB
C
137 lines
2.8 KiB
C
#include <stddef.h>
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#include <stdint.h>
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#include <tianole/early_log.h>
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#include <tianole/mm.h>
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#include <tianole/sched.h>
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#define KERNEL_STACK_SIZE (PAGE_SIZE * 4u)
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#define STACK_ALIGNMENT 16u
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static struct thread *run_queue_head;
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static struct thread *run_queue_tail;
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static uint64_t next_thread_id = 1;
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static int scheduler_ready;
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static uintptr_t align_down_uintptr(uintptr_t value, uintptr_t alignment)
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{
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return value & ~(alignment - 1);
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}
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static void copy_thread_name(char *dest, size_t dest_size, const char *src)
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{
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size_t index;
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if (dest_size == 0) {
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return;
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}
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if (src == 0) {
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src = "thread";
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}
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for (index = 0; index + 1 < dest_size && src[index] != '\0'; index++) {
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dest[index] = src[index];
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}
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dest[index] = '\0';
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}
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static void enqueue_thread(struct thread *thread)
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{
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thread->next = 0;
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if (run_queue_tail != 0) {
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run_queue_tail->next = thread;
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} else {
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run_queue_head = thread;
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}
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run_queue_tail = thread;
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}
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struct thread *kernel_thread_create(
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const char *name, kernel_thread_entry_t entry, void *arg)
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{
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struct thread *thread;
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uintptr_t stack_top;
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if (entry == 0) {
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return 0;
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}
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thread = kmalloc(sizeof(*thread));
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if (thread == 0) {
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return 0;
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}
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thread->stack_base = kmalloc(KERNEL_STACK_SIZE);
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if (thread->stack_base == 0) {
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kfree(thread);
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return 0;
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}
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stack_top = (uintptr_t)thread->stack_base + KERNEL_STACK_SIZE;
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thread->id = next_thread_id++;
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thread->state = THREAD_READY;
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thread->entry = entry;
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thread->arg = arg;
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thread->stack_top = align_down_uintptr(stack_top, STACK_ALIGNMENT);
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thread->stack_size = KERNEL_STACK_SIZE;
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thread->next = 0;
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copy_thread_name(thread->name, sizeof(thread->name), name);
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enqueue_thread(thread);
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return thread;
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}
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static void thread_selftest_entry(void *arg)
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{
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(void)arg;
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}
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static void scheduler_selftest(void)
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{
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struct thread *first =
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kernel_thread_create("worker-a", thread_selftest_entry, 0);
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struct thread *second =
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kernel_thread_create("worker-b", thread_selftest_entry, 0);
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if (first == 0 || second == 0 || first == second) {
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panic("kernel thread selftest allocation failed");
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}
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if (first->id == second->id || first->state != THREAD_READY ||
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second->state != THREAD_READY) {
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panic("kernel thread selftest state failed");
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}
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if ((first->stack_top & (STACK_ALIGNMENT - 1)) != 0 ||
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(second->stack_top & (STACK_ALIGNMENT - 1)) != 0) {
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panic("kernel thread selftest stack alignment failed");
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}
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if (run_queue_head != first || first->next != second ||
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run_queue_tail != second) {
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panic("kernel thread selftest run queue failed");
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}
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early_log_puts("kernel thread selftest ok\n");
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}
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void sched_init(void)
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{
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if (scheduler_ready != 0) {
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return;
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}
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run_queue_head = 0;
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run_queue_tail = 0;
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scheduler_ready = 1;
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early_log_puts("scheduler initialized\n");
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scheduler_selftest();
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}
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