struc

Makefile

@@ -4,21 +4,33 @@ CC = $(CROSS_COMPILE)gcc
 LD = $(CROSS_COMPILE)ld
 OBJCOPY = $(CROSS_COMPILE)objcopy
 
-CFLAGS = -Wall -mcpu=arm926ej-s -nostdlib -ffreestanding
+CFLAGS = -Wall -mcpu=arm926ej-s -nostdlib -ffreestanding -I.
+
+.SUFFIXES: .s .o .c
+
+%.o:    %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+%.o:    %.s
+	$(AS) -mcpu=arm926ej-s $< -o $@
+
+ASM_S_FILES = $(wildcard system/asm/*.s)
+ASM_O_FILES = $(ASM_S_FILES:.s=.o)
+
+CFILES = $(wildcard devices/*.c) $(wildcard devices/*/*.c) $(wildcard system/*.c) $(wildcard system/*/*.c)
+COFILES  = $(CFILES:.c=.o)
+OFILES = $(ASM_O_FILES) $(COFILES)
 
 all: kernel.bin
 
-kernel.elf: boot.o kernel.o
+kernel.elf: ${OFILES}
 	$(LD) -T boot.ld -o $@ $^
 
 kernel.bin: kernel.elf
 	$(OBJCOPY) -O binary $< $@
 
-boot.o: boot.s
-	$(AS) -mcpu=arm926ej-s $< -o $@
-
-kernel.o: kernel.c
-	$(CC) $(CFLAGS) -c $< -o $@
-
 clean:
-	rm -f *.o *.elf *.bin
+	rm -f *.o */*.o */*/*.o *.elf *.bin
+	
+run: kernel.bin
+	qemu-system-arm -M versatilepb -m 128M -nographic -kernel kernel.bin

boot.s

@@ -1,12 +0,0 @@
-.global _start
-.section .text
-_start:
-    // Set up stack pointer
-    LDR sp, =stack_top
-
-    // Jump to kernel main entry point
-    BL kernel_main
-
-    // Infinite loop if kernel_main returns
-halt:
-    B halt

irq.s

@@ -1,7 +0,0 @@
-.global irq_handler
-.type irq_handler, %function
-
-irq_handler:
-    PUSH {r0-r12, lr}
-    BL task_schedule
-    POP {r0-r12, pc}

kernel.c

@@ -1,32 +0,0 @@
-#include "uart.h"
-#include "task.h"
-#include "shell.h"
-
-#define TIMER_BASE  0x101E2000
-#define TIMER_LOAD  (*(volatile unsigned int *)(TIMER_BASE + 0x00))
-#define TIMER_CTRL  (*(volatile unsigned int *)(TIMER_BASE + 0x08))
-
-void timer_init() {
-    TIMER_LOAD = 0x10000;
-    TIMER_CTRL = (1 << 7) | (1 << 6) | (1 << 5) | 1;
-}
-
-void enable_interrupts() {
-    __asm__ volatile (
-        "mrs r0, cpsr\n"
-        "bic r0, r0, #0x80\n"
-        "msr cpsr_c, r0\n"
-    );
-}
-
-void kernel_main(void) {
-    uart_init();
-    uart_write("MiniOS Kernel Booted\n");
-
-    timer_init();
-    enable_interrupts();
-
-    task_init();
-
-    shell_run();
-}

shell.c

@@ -1,36 +0,0 @@
-#include "uart.h"
-#include "task.h"
-#include "shell.h"
-#include <string.h>
-
-void shell_run() {
-    char input[64];
-    int pos = 0;
-
-    uart_write("MiniOS Shell> ");
-
-    while (1) {
-        char c = uart_getchar();
-        uart_putchar(c); // Echo
-        if (c == '\r' || c == '\n') {
-            input[pos] = '\0';
-            uart_write("\n");
-
-            if (strcmp(input, "echo") == 0) {
-                uart_write("Echo test\n");
-            } else if (strcmp(input, "ps") == 0) {
-                uart_write("Task list: [0] task1, [1] task2\n");
-            } else if (strcmp(input, "halt") == 0) {
-                uart_write("System halted.\n");
-                while (1);
-            } else {
-                uart_write("Unknown command\n");
-            }
-
-            pos = 0;
-            uart_write("MiniOS Shell> ");
-        } else {
-            input[pos++] = c;
-        }
-    }
-}

shell.h

@@ -1,6 +0,0 @@
-#ifndef SHELL_H
-#define SHELL_H
-
-void shell_run(void);
-
-#endif

startup.s

@@ -1,9 +0,0 @@
-.global _start
-.section .text
-_start:
-    LDR sp, =stack_top
-    BL kernel_main
-    B .
-
-.org 0x18
-    B irq_handler

switch.s

@@ -1,18 +0,0 @@
-.global context_switch
-.type context_switch, %function
-
-context_switch:
-    // r0 = current task context
-    // r1 = next task context
-
-    // Save r4-r12
-    STMIA r0!, {r4-r12}
-    STR sp, [r0]
-    STR lr, [r0, #4]
-
-    // Restore r4-r12
-    LDMIA r1!, {r4-r12}
-    LDR sp, [r1]
-    LDR lr, [r1, #4]
-
-    BX lr

task.c

@@ -1,26 +0,0 @@
-#include "task.h"
-
-task_t tasks[MAX_TASKS];
-int current_task = 0;
-
-void task1() {
-    while (1);
-}
-
-void task2() {
-    while (1);
-}
-
-void task_init() {
-    tasks[0].context.sp = (unsigned int)&tasks[0].stack[255];
-    tasks[0].context.lr = (unsigned int)task1;
-
-    tasks[1].context.sp = (unsigned int)&tasks[1].stack[255];
-    tasks[1].context.lr = (unsigned int)task2;
-
-    current_task = 0;
-}
-
-void task_schedule() {
-    current_task = (current_task + 1) % MAX_TASKS;
-}

task.h

@@ -1,22 +0,0 @@
-#ifndef TASK_H
-#define TASK_H
-
-#define MAX_TASKS 2
-
-typedef struct {
-    unsigned int regs[13]; // r0-r12
-    unsigned int sp;
-    unsigned int lr;
-} context_t;
-
-typedef struct {
-    context_t context;
-    unsigned int stack[256];
-} task_t;
-
-void task_init(void);
-void task_schedule(void);
-extern task_t tasks[MAX_TASKS];
-extern int current_task;
-
-#endif