From e5ae7f10f3e144f4a08ee7a66b4105a5aa86e6e7 Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <tullivan99@gmail.com>
Date: Thu, 4 Jan 2018 11:47:43 -0500
Subject: initrd, lcd, file cleanup

---
 task.c | 108 -----------------------------------------------------------------
 1 file changed, 108 deletions(-)
 delete mode 100644 task.c

(limited to 'task.c')

diff --git a/task.c b/task.c
deleted file mode 100644
index b77d4f5..0000000
--- a/task.c
+++ /dev/null
@@ -1,108 +0,0 @@
-#include <task.h>
-#include <heap.h>
-#include <stm32l476xx.h>
-
-typedef struct {
-	uint32_t *sp;
-	uint8_t use;
-	uint32_t *stack;
-	void (*code)(void);
-} task_t;
-
-#define MAX_TASKS	4
-
-static task_t tasks[MAX_TASKS];
-static int next_idx = 0;
-
-void task_init(void (*init)(void))
-{
-	for (int i = 0; i < MAX_TASKS; i++)
-		tasks[i].use = 0;
-
-	task_start(init, 1024);
-	asm("\
-		msr psp, %0; \
-		mrs r0, control; \
-		orr r0, r0, #2; \
-		msr control, r0; \
-		isb; \
-	" :: "r" (tasks[0].sp));
-
-	init();
-
-	// force switch to tasking, call pendsv
-	//SCB->ICSR |= SCB_ICSR_PENDSVSET_Msk;
-}
-
-extern void _exit(int);
-void task_exit(void)
-{
-	// TODO free stack?
-	asm("cpsid i"); // hope to catch next_idx
-	tasks[next_idx].use = 0;
-	asm("cpsie i");
-	while (1); // bye
-	//_exit(0);
-}
-
-void task_start(void (*task)(void), uint16_t stackSize)
-{
-	asm("cpsid i"); // just to be safe
-
-	for (int i = 0; i < MAX_TASKS; i++) {
-		if (tasks[i].use == 0) {
-			tasks[i].stack = hmalloc(stackSize);
-			tasks[i].sp = tasks[i].stack + stackSize - 16;
-			tasks[i].sp[13] = (uint32_t)task_exit;
-			tasks[i].sp[14] = (uint32_t)task;
-			tasks[i].sp[15] = 0x01000000;
-			tasks[i].use = 1;
-			tasks[i].code = task;
-			asm("cpsie i");
-			return;
-		}
-	}
-
-	// TODO handle error
-}
-
-__attribute__ ((naked))
-void PendSV_Handler(void) 
-{
-	// save state
-	//stmdb r0!, {r4-r11};
-	asm("\
-		cpsid i; \
-		isb; \
-		dsb; \
-		mrs r0, psp; \
-		stmdb r0!, {r4-r11}; \
-		mov %0, r0; \
-	" : "=r" (tasks[next_idx].sp));
-
-	// find next task (round-robin style)
-	do {
-		if (++next_idx == MAX_TASKS) {
-			next_idx = 0;
-			break; // task 0 better exist
-		}
-	} while (tasks[next_idx].use == 0);
-
-	// restore
-	//ldmia r0!, {r4-r11};
-	asm("\
-		mov r0, %0; \
-		ldmia r0!, {r4-r11}; \
-		msr psp, r0; \
-		isb; \
-		dsb; \
-	" :: "r" (tasks[next_idx].sp));
-
-	// end
-	asm("\
-		mov r0, #0xFFFFFFFD; \
-		cpsie i; \
-		bx r0; \
-	");
-}
-
-- 
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