From 00660fb9143daf7fa04647bccd6047b9bf0f5e48 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Fri, 21 Jan 2022 11:37:49 -0700
Subject: Scheduler Rewrite Start

---
 later/schedule.q.c | 118 -----------------------------------------------------
 1 file changed, 118 deletions(-)
 delete mode 100644 later/schedule.q.c

(limited to 'later/schedule.q.c')

diff --git a/later/schedule.q.c b/later/schedule.q.c
deleted file mode 100644
index 4a5ff85..0000000
--- a/later/schedule.q.c
+++ /dev/null
@@ -1,118 +0,0 @@
-#if !(defined(LL) || defined(FLAT))
-#include "../sys/schedule.h"
-#include "../lib/q.h"
-#include "../lib/mem.h"
-#include "../drivers/uart.h"
-
-extern void preserveregs(void*);
-extern void restoreregs(void*);
-extern void exetask(void*);
-
-static unsigned long next_pid = 3;
-unsigned char table[256] = {0, };
-
-static struct __attribute__((packed,align(4))) Q_base bq = {
-	.next = 0,
-	.last = 0,
-};
-struct __attribute__((packed,align(4))) Scheduler scheduler = {
-	.running_pid = 0,
-	.tasks = &bq,
-};
-
-extern unsigned long __stacks_start;
-
-unsigned long getstack(void)
-{
-	for(unsigned int i = 0; i < 256; i++) {
-		if (table[i] == 0) {
-			table[i] = 1;
-			return i;
-		}
-	}
-	return -1;
-}
-
-void add_fxn(void (*task)(void), unsigned char priority)
-{
-	struct Task* t = (struct Task*)malloc(sizeof(struct Task));
-	// Allocate a stack frame and space for registers to be preserved on context switches
-	t->priority = priority;
-	t->task = task;
-	t->stacki = getstack();
-	t->pid = next_pid;
-	next_pid += 1;
-	if(t->stacki > 256)
-		t->stack = 0;
-	else
-		t->stack = (void*)(__stacks_start + STACK_SIZE*t->stacki);
-	t->status = S_READY;
-	for(unsigned char i = 0; i < 13; i++)
-		t->reg[i] = 0;
-	t->reg[13] = (unsigned long)t->stack;
-	t->reg[14] = 0; // LR
-	t->reg[15] = (unsigned long)task; // PC
-	pushq(scheduler.tasks, t);
-}
-
-unsigned char exists(void (*task)(void))
-{
-	if (scheduler.tasks->next == 0)
-		return 0;
-	struct Q* q = scheduler.tasks->next;
-	while (q != 0) {
-		struct Task* t = q->data;
-		if (t->task == task)
-			return 1;
-		q = q->next;
-	}
-	return 0;
-}
-
-void add_no_repeat(void (*task)(void), unsigned char priority)
-{
-	if (!(exists(task)))
-		add_fxn(task, priority);
-}
-
-unsigned int get_task_length(void)
-{
-	unsigned int length = 0;
-	if (scheduler.tasks->last == 0)
-		return length;
-	else if (scheduler.tasks->next == scheduler.tasks->last)
-		return 1;
-	else {
-		struct Q* q = scheduler.tasks->next;
-		length += 1;
-		while (q->next != 0) {
-			q = q->next;
-			length += 1;
-		}
-		return length;
-	}
-}
-void execute_task(void)
-{
-	// Preserve Current Running PID's Data
-	if (scheduler.tasks->last != 0) {
-		struct Q* q = (struct Q*)scheduler.tasks->next;
-		while (((struct Task*)q->data)->status == S_WAITING) {
-			q = q->next;
-		}
-		struct Task* tsk = (struct Task*)q->data;
-		// Restore registers 
-		//  Including program counter as the entry point
-		//  Including allocated stack position
-		//  Set lr to the return address to restore system stack
-		//preserveregs(tsk->reg);
-		//restoreregs(tsk->reg);
-		scheduler.running_pid = tsk->pid;
-		exetask(tsk->reg);
-		scheduler.running_pid = 0;
-		table[tsk->stacki] = 0;
-		popq(scheduler.tasks);
-	}
-}
-
-#endif
-- 
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