From 1b180d2f15e9b726e6e9dde5601f41fa48c1c044 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Mon, 3 Jan 2022 20:10:10 -0800
Subject: Ensured Aligned Mutexes

---
 src/cpu/irq.c           | 11 +++++++
 src/lib/mem.c           | 73 +++++++++++++++++++++++++++++++++++++++++++
 src/lib/mem.h           |  2 ++
 src/sys/core.c          |  7 ++++-
 src/sys/schedule.c      | 83 -------------------------------------------------
 src/sys/schedule.flat.c | 32 -------------------
 src/sys/schedule.h      | 35 ---------------------
 src/sys/schedule.ll.c   | 13 --------
 src/sys/schedule.q.c    | 49 -----------------------------
 src/util/mutex.c        |  9 ++++++
 src/util/mutex.h        |  1 +
 src/util/status.c       | 22 +++++++++++++
 12 files changed, 124 insertions(+), 213 deletions(-)
 delete mode 100644 src/sys/schedule.c
 delete mode 100644 src/sys/schedule.flat.c
 delete mode 100644 src/sys/schedule.h
 delete mode 100644 src/sys/schedule.ll.c
 delete mode 100644 src/sys/schedule.q.c

(limited to 'src')

diff --git a/src/cpu/irq.c b/src/cpu/irq.c
index 874e764..dbd4c10 100644
--- a/src/cpu/irq.c
+++ b/src/cpu/irq.c
@@ -4,11 +4,14 @@
 #include "../sys/core.h"
 #include "../sys/timer.h"
 #include "../util/mutex.h"
+#include "../util/status.h"
 #include "../util/time.h"
 
 extern unsigned long cmdidx;
 extern char cmd[2048];
 
+void localtest(void);
+
 void c_irq_handler(void)
 {
 	disableirq();
@@ -61,6 +64,10 @@ void c_irq_handler(void)
 							cmd[off] = (char) data;
 							off += 1;
 							release_mutex(&exe_cnt_m, SYS_PID);
+						// New Task Case
+						} else if (data == 0x61) {
+							cmd[off] = (char) data;
+							off += 1;
 						// Else output
 						} else {
 							cmd[off] = (char) data;
@@ -99,3 +106,7 @@ void c_irq_handler(void)
 	}
 	return;
 }
+
+void localtest(void)
+{
+}
diff --git a/src/lib/mem.c b/src/lib/mem.c
index 296e096..d738305 100644
--- a/src/lib/mem.c
+++ b/src/lib/mem.c
@@ -64,6 +64,45 @@ void* malloc(unsigned char size)
 	return (void*)&mem[i+2];
 }
 
+void* malloca(unsigned char size, unsigned char amnt)
+{
+	unsigned char* mem = (unsigned char*)rpi_heap;
+	unsigned long i = 0;
+	// TODO: Use Null PID
+	while(1) {
+		unsigned long diff = (unsigned long)mem + i + 2;
+		diff %= amnt;
+		diff = amnt - diff;
+		if((mem[i] == size) && mem[i+1]==0) {
+			if(diff == 0) {
+				mem[i] = size;
+				mem[i+1] = 1;
+				return (void*)&mem[i+2];
+			}
+		} else if (mem[i] == 0) {
+			if(diff == 0 || diff == amnt) {
+				mem[i] = size;
+				mem[i+1] = 1;
+				rpi_heap_top = (void*)&mem[i+2+size];
+				return (void*)&mem[i+2];
+			} else {
+				if(diff <= 2) {
+					diff += amnt;
+				}
+				mem[i] = diff-2;
+				mem[i+1] = 0;
+				i += diff;
+				mem[i] = size;
+				mem[i+1] = 1;
+				rpi_heap_top = (void*)&mem[i+2+size];
+				return (void*)&mem[i+2];
+			}
+		}
+
+		i += mem[i]+2;
+	}
+}
+
 void free(void* memloc)
 {
 	// Don't try to free memory outside of heap
@@ -122,3 +161,37 @@ void heap_info(void)
 	}
 	uart_char('\n');
 }
+
+void heap_info_u(void)
+{
+	unsigned char* base = rpi_heap;
+	while ((void*)base < rpi_heap_top) {
+		unsigned char size = *base;
+		if(base[1] == 0) {
+			base += size + 2;
+			continue;
+		}
+		uart_hex((unsigned long)(base+2));
+		uart_string(" Size: ");
+		uart_10(size);
+		uart_string("\n");
+		static char* data = "00 \0";
+		static unsigned char temp = 0;
+		for(unsigned int i = 0; i < size; i++) {
+			temp = (base[2+i]>>4)&0xF;
+			if(temp > 9)
+				temp += 7;
+			temp += 0x30;
+			data[0] = temp;
+			temp = (base[2+i])&0xF;
+			if(temp > 9)
+				temp += 7;
+			temp += 0x30;
+			data[1] = temp;
+			uart_string(data);
+		}
+		uart_char('\n');
+		base += size + 2;
+	}
+	uart_char('\n');
+}
diff --git a/src/lib/mem.h b/src/lib/mem.h
index ec1402f..5c5cc94 100644
--- a/src/lib/mem.h
+++ b/src/lib/mem.h
@@ -15,9 +15,11 @@ void memcpy32(unsigned long* src, unsigned long* dest, unsigned int n);
 unsigned char memcmp32(unsigned long* a, unsigned long* b, unsigned int n);
 
 void* malloc(unsigned char size);
+void* malloca(unsigned char size, unsigned char amnt);
 void free(void* memloc);
 void* heap_base(void);
 void* heap_top(void);
 void heap_info(void);
+void heap_info_u(void);
 
 #endif
diff --git a/src/sys/core.c b/src/sys/core.c
index fbe0536..8d37a88 100644
--- a/src/sys/core.c
+++ b/src/sys/core.c
@@ -8,7 +8,6 @@
 #include "../lib/strings.h"
 #include "../sys/core.h"
 #include "../sys/power.h"
-#include "../sys/schedule.h"
 #include "../sys/timer.h"
 #include "../util/mutex.h"
 #include "../util/status.h"
@@ -51,4 +50,10 @@ void sysinit(void)
 	enablefiq();
 
 	// Start Scheduler
+	unsigned long count1 = -5;
+	struct Mutex* m = create_mutex(&count1);
+	if (lock_mutex(m, SYS_PID) == 0) {
+		uart_hex(*(unsigned long*)m->addr);
+		release_mutex(m, SYS_PID);
+	}
 }
diff --git a/src/sys/schedule.c b/src/sys/schedule.c
deleted file mode 100644
index 8cf2780..0000000
--- a/src/sys/schedule.c
+++ /dev/null
@@ -1,83 +0,0 @@
-#include "../sys/schedule.h"
-#include "../lib/ll.h"
-#include "../lib/q.h"
-
-#ifdef IGNORE
-#ifdef FLAT
-static struct Task* task_list[256];
-
-static struct Scheduler scheduler = {
-	.tasks = task_list,
-};
-
-static unsigned int ntask_i = 0;
-
-void add_task(struct Task* t)
-{
-	scheduler.tasks[ntask_i] = t;
-	ntask_i += 1;
-	if (ntask_i > 256) {
-		ntask_i = 0;
-	}
-}
-
-unsigned int get_task_length(void)
-{
-	return ntask_i;
-}
-
-void execute_task(void)
-{
-	if (scheduler.tasks[ntask_i-1] != 0)
-		scheduler.tasks[ntask_i-1]->task();
-}
-#elseif LL
-static struct LL bl = {
-	.prev = 0,
-	.next = 0,
-};
-static struct Scheduler scheduler = {
-	.tasks = &bl,
-};
-#else
-static struct Q_base bq = {
-	.next = 0,
-	.last = 0,
-};
-static struct Scheduler  scheduler = {
-	.tasks = &bq,
-};
-
-void add_task(struct Task* t)
-{
-	pushq(scheduler.tasks, t);
-}
-
-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)
-{
-	if (scheduler.tasks->last != 0) {
-		struct Task* tsk = (struct Task*)scheduler.tasks->next->data;
-		(tsk->task)();
-		popq(scheduler.tasks);
-	}
-}
-#endif
-#endif
diff --git a/src/sys/schedule.flat.c b/src/sys/schedule.flat.c
deleted file mode 100644
index 6eb0d14..0000000
--- a/src/sys/schedule.flat.c
+++ /dev/null
@@ -1,32 +0,0 @@
-#ifdef FLAT
-
-#include "../sys/schedule.h"
-static struct Task* task_list[256];
-
-static struct Scheduler scheduler = {
-	.tasks = task_list,
-};
-
-static unsigned int ntask_i = 0;
-
-void add_task(struct Task* t)
-{
-	scheduler.tasks[ntask_i] = t;
-	ntask_i += 1;
-	if (ntask_i > 256) {
-		ntask_i = 0;
-	}
-}
-
-unsigned int get_task_length(void)
-{
-	return ntask_i;
-}
-
-void execute_task(void)
-{
-	if (scheduler.tasks[ntask_i-1] != 0)
-		scheduler.tasks[ntask_i-1]->task();
-}
-
-#endif
diff --git a/src/sys/schedule.h b/src/sys/schedule.h
deleted file mode 100644
index c8e938d..0000000
--- a/src/sys/schedule.h
+++ /dev/null
@@ -1,35 +0,0 @@
-#ifndef SYS_SCHEDULE_H
-#define SYS_SCHEDULE_H
-
-#define STACK_SIZE 0x1000
-struct TaskMemory {
-	unsigned long reg[16];
-	unsigned char stack[STACK_SIZE];
-};
-
-struct Task {
-	unsigned char priority;
-	void (*task)(void);
-};
-
-#ifdef FLAT
-struct Scheduler {
-	struct Task** tasks;
-};
-#elseif LL
-#include "../lib/ll.h"
-struct Scheduler {
-	struct LL* tasks;
-};
-#else
-#include "../lib/q.h"
-struct Scheduler {
-	struct Q_base* tasks;
-};
-#endif
-
-void add_fxn(void (*task)(void), unsigned char priority);
-unsigned int get_task_length(void);
-void execute_task(void);
-
-#endif
diff --git a/src/sys/schedule.ll.c b/src/sys/schedule.ll.c
deleted file mode 100644
index d9ab954..0000000
--- a/src/sys/schedule.ll.c
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifdef LL
-
-#include "../sys/schedule.h"
-#include "../lib/ll.h"
-static struct LL bl = {
-	.prev = 0,
-	.next = 0,
-};
-static struct Scheduler scheduler = {
-	.tasks = &bl,
-};
-
-#endif
diff --git a/src/sys/schedule.q.c b/src/sys/schedule.q.c
deleted file mode 100644
index 88488da..0000000
--- a/src/sys/schedule.q.c
+++ /dev/null
@@ -1,49 +0,0 @@
-#if !(defined(LL) || defined(FLAT))
-#include "../sys/schedule.h"
-#include "../lib/q.h"
-#include "../lib/mem.h"
-
-static struct Q_base bq = {
-	.next = 0,
-	.last = 0,
-};
-static struct Scheduler  scheduler = {
-	.tasks = &bq,
-};
-
-void add_fxn(void (*task)(void), unsigned char priority)
-{
-	struct Task* t = (struct Task*)malloc(sizeof(struct Task));
-	t->priority = priority;
-	t->task = task;
-	pushq(scheduler.tasks, t);
-}
-
-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)
-{
-	if (scheduler.tasks->last != 0) {
-		struct Task* tsk = (struct Task*)scheduler.tasks->next->data;
-		(tsk->task)();
-		popq(scheduler.tasks);
-	}
-}
-
-#endif
diff --git a/src/util/mutex.c b/src/util/mutex.c
index 2637a6c..1763de2 100644
--- a/src/util/mutex.c
+++ b/src/util/mutex.c
@@ -1,4 +1,5 @@
 #include "../cpu/atomic/swap.h"
+#include "../lib/mem.h"
 #include "../util/mutex.h"
 
 unsigned char lock_mutex(struct Mutex* m, unsigned long pid)
@@ -21,3 +22,11 @@ unsigned char release_mutex(struct Mutex* m, unsigned long pid)
 	}
 	return 1;
 }
+
+struct Mutex* create_mutex(void* addr)
+{
+	// Ensure aligned to word - Important for Atomic Swap
+	struct Mutex* m = (struct Mutex*)malloca(sizeof(struct Mutex), 4);
+	m->addr = addr;
+	return m;
+}
diff --git a/src/util/mutex.h b/src/util/mutex.h
index 283be53..524a461 100644
--- a/src/util/mutex.h
+++ b/src/util/mutex.h
@@ -12,5 +12,6 @@ struct Mutex {
 
 unsigned char lock_mutex(struct Mutex*, unsigned long);
 unsigned char release_mutex(struct Mutex*, unsigned long);
+struct Mutex* create_mutex(void* addr);
 
 #endif
diff --git a/src/util/status.c b/src/util/status.c
index c4a7c80..1ac08e8 100644
--- a/src/util/status.c
+++ b/src/util/status.c
@@ -123,6 +123,28 @@ void status(void)
 		}
 		write_cchar(&g_Drawer, '!', 0xFF00FF);
 	}
+
+	g_Drawer.x = 0;
+	g_Drawer.y = 9;
+	for(int i = 0; i < 128; i++)
+		write_char(&g_Drawer, ' ');
+	g_Drawer.x = 0;
+	g_Drawer.y = 9;
+	/*
+	struct Q* q = scheduler.tasks->next;
+	while (q != 0) {
+		struct Task* t = q->data;
+		write_hex32(&g_Drawer, (unsigned long)t->task);
+		write_char(&g_Drawer, ' ');
+		q = q->next;
+	}
+	write_char(&g_Drawer, '\n');
+	*/
+
+	unsigned long sp;
+	asm volatile ("mov %0, sp": "=r"(sp));
+	write_hex32(&g_Drawer, sp);
+
 	g_Drawer.x = x;
 	g_Drawer.y = y;
 }
-- 
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