From 0d80865f669c2314c905f94a4117300a33338792 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Wed, 2 Mar 2022 22:28:41 -0700
Subject: Remove old scheduling

---
 later/schedule.c | 167 -------------------------------------------------------
 1 file changed, 167 deletions(-)
 delete mode 100644 later/schedule.c

(limited to 'later/schedule.c')

diff --git a/later/schedule.c b/later/schedule.c
deleted file mode 100644
index c300ae0..0000000
--- a/later/schedule.c
+++ /dev/null
@@ -1,167 +0,0 @@
-#include <cpu/irq.h>
-#include <drivers/uart.h>
-#include <globals.h>
-#include <sys/core.h>
-#include <sys/schedule.h>
-#include <util/mutex.h>
-
-void init_scheduler(void)
-{
-	for(int i = 0; i < PRIORITIES; i++) {
-		scheduler.tlist[i].prev = &scheduler.tlist[i];
-		scheduler.tlist[i].next = &scheduler.tlist[i];
-		scheduler.tlist[i].data = 0;
-	}
-	scheduler.rthread_ll = 0;
-	scheduler.ctx = &svccpu;
-}
-
-void* get_stack(void)
-{
-	for (int i = 0; i < MAX_THREADS; i++) {
-		if (stacks_table[i] == 0) {
-			stacks_table[i] = 1;
-			return (void*)heap_end() - STACK_SIZE*i;
-		}
-	}
-	return 0;
-}
-
-void add_thread(void (*thread_fxn)(void), unsigned char priority)
-{
-	struct Thread* thread = (struct Thread*)malloca(sizeof(struct Thread), 4);
-	// Set the program counter to the entry
-	thread->thread = thread_fxn;
-	// Get a stack frame
-	thread->stack_base = get_stack();
-	thread->stack = thread->stack_base;
-	// Put in error state for no stack
-	if(thread->stack == 0)
-		thread->data.status = THREAD_STACK_ERROR;
-	else
-		thread->data.status = THREAD_READY;
-	// Doesn't wait for mutex at start
-	thread->data.mutex_waiting = 0;
-	// Set PID
-	thread->data.pid = nextpid++;
-	thread->data.preempt_count = 0;
-	thread->data.cpu_context.lr = (unsigned long)cleanup;
-	unsigned char p = priority;
-	if (p >= PRIORITIES) {
-		p = PRIORITIES - 1;
-	}
-	thread->data.priority = p;
-	push_ll(&scheduler.tlist[p], thread);
-}
-
-struct LL* get_next_thread(void)
-{
-	for(unsigned long i = 0; i < PRIORITIES; i++) {
-		struct LL* thread_ll = scheduler.tlist[i].next;
-		if (thread_ll == &scheduler.tlist[i])
-			continue;
-		do {
-			struct Thread* thread = thread_ll->data;
-			if((thread->data.status == THREAD_RUNNING) || (thread->data.status == THREAD_READY))
-				return thread_ll;
-			thread_ll = thread_ll->next;
-		} while(thread_ll != &scheduler.tlist[i]);
-	}
-	return 0;
-}
-
-void schedule_c(void)
-{
-	// Preserve registers in current context
-	preserve_ctx(scheduler.ctx);
-
-	// Get current thread
-	struct LL* current_thread_ll = scheduler.rthread_ll;
-	// Get next thread
-	struct LL* next_thread_ll = get_next_thread();
-
-	// If there is a current thread
-	if (current_thread_ll != 0) {
-		// If we are switching the thread
-		if (current_thread_ll != next_thread_ll) {
-			// Context switch
-			struct Thread* current_thread = current_thread_ll->data;
-			struct Thread* next_thread = next_thread_ll->data;
-			preserve_stack(current_thread);
-			//preserve_pc(current_thread);
-			current_thread->thread = (void*)current_thread->data.cpu_context.lr;
-			restore_stack(next_thread);
-			scheduler.rthread_ll = next_thread_ll;
-			scheduler.ctx = &next_thread->data.cpu_context;
-		}
-	}
-	else if (next_thread_ll != 0) {
-		struct Thread* next_thread = next_thread_ll->data;
-		preserve_sys_stack(&svcsp);
-		restore_stack(next_thread);
-		scheduler.rthread_ll = next_thread_ll;
-		scheduler.ctx = &next_thread->data.cpu_context;
-	}
-	if (scheduler.rthread_ll) {
-		struct Thread* rthread = scheduler.rthread_ll->data;
-		restore_ctx(scheduler.ctx);
-		asm volatile ("bx %0" :: "r"(rthread->thread));
-	} else {
-		scheduler.ctx = &svccpu;
-		restore_sys_stack(&svcsp);
-		restore_ctx(scheduler.ctx);
-	}
-}
-
-void cleanup(void)
-{
-	if (scheduler.rthread_ll != 0) {
-		// Mark the thread as finished
-		struct Thread* t = scheduler.rthread_ll->data;
-		//uart_string("Cleaning up thread ");
-		//uart_10(t->data.pid);
-		//uart_char('\n');
-		t->data.status = THREAD_FINISHED;
-		// Mark the stack space as free
-		unsigned long sidx = (unsigned long)(heap_end() - t->stack_base)/STACK_SIZE;
-		stacks_table[sidx] = 0;
-		// Remove the thread
-		struct LL* ll = scheduler.rthread_ll;
-		struct LL* prev = ll->prev;
-		struct LL* next = ll->next;
-		prev->next = ll->next;
-		next->prev = ll->prev;
-		free(ll->data);
-		free(ll);
-		scheduler.rthread_ll = 0;
-	}
-	// Schedule next thread
-	schedule();
-}
-
-void sched_info(void)
-{
-	uart_string("Scheduler Information\n");
-	for(unsigned long i = 0; i < PRIORITIES; i++) {
-		struct LL* ll = scheduler.tlist[i].next;
-		uart_string("Queue ");
-		uart_10(i);
-		while (ll != &scheduler.tlist[i]) {
-			uart_string("\nThread ");
-			struct Thread* t = ll->data;
-			uart_hex((unsigned long)t->thread);uart_char(' ');
-			uart_hex((unsigned long)t->stack);uart_char(' ');
-			uart_hex((unsigned long)t->stack_base);uart_char(' ');
-			uart_10(t->data.priority);uart_char(' ');
-			uart_10(t->data.preempt_count);uart_char(' ');
-			uart_10(t->data.status);uart_char(' ');
-			uart_hex((unsigned long)t->data.mutex_waiting);uart_char(' ');
-			uart_10(t->data.pid);uart_char('\n');
-			memshow32((unsigned long*)&t->data.cpu_context, 10);
-			ll = ll->next;
-		}
-		uart_char('\n');
-	}
-	uart_string("Stacks:\n");
-	memshow32((unsigned long*)stacks_table, 6);
-}
-- 
cgit v1.2.1