Added semi-syscalls!

source/Makefile

@@ -149,11 +149,11 @@ override LDFLAGS += \
 
 # Use "find" to glob all *.c, *.S, and *.asm files in the tree and obtain the
 # object and header dependency file names.
-override CFILES := $(shell find -L * -type f -name '*.c')
+override CFILES := $(shell find -L kernel drivers -type f -name '*.c')
 
 # These are disabled because we don't want plain assembly code which will break the compiler for diffrent arch.
-override ASFILES := $(shell find -L * -type f -name '*.S')
-override NASMFILES := $(shell find -L * -type f -name '*.asm')
+override ASFILES := $(shell find -L kernel drivers -type f -name '*.S')
+override NASMFILES := $(shell find -L kernel drivers -type f -name '*.asm')
 
 override OBJ := $(addprefix obj/,$(CFILES:.c=.c.o) $(ASFILES:.S=.S.o) $(NASMFILES:.asm=.asm.o))
 override HEADER_DEPS := $(addprefix obj/,$(CFILES:.c=.c.d) $(ASFILES:.S=.S.d))

source/frosted-dm/desktop-manager.c

@@ -0,0 +1,17 @@
+/**
+ * @file desktop-manager.c
+ * @author Pradosh ([email protected])
+ * @brief This is the main separate ELF that will contain the desktop/window manager.
+ * @version 0.1
+ * @date 2023-12-31
+ * 
+ * @copyright Copyright (c) Pradosh 2023
+ * 
+ */
+
+void fdm_main(){
+    sys_print("hello for desktop-manager!");
+    while(1){
+
+    }
+}

source/frosted-dm/syscalls.c

@@ -0,0 +1,23 @@
+/**
+ * @file syscalls.c
+ * @author Pradosh ([email protected])
+ * @brief Contains the system calls for the kernel and desktop manager.
+ * @version 0.1
+ * @date 2023-12-31
+ * 
+ * @copyright Copyright (c) Pradosh 2023
+ * 
+ */
+#include <basics.h>
+#include <syscalls.h>
+
+void sys_print(const char* message) {
+    asm volatile (
+        "mov rax, %0\n\t"
+        "mov rbx, %1\n\t"
+        "int 0x80"
+        :
+        : "r"(sys_print), "r"(message)
+        : "rax", "rbx"
+    );
+}

source/includes/syscalls.h

@@ -0,0 +1,18 @@
+/**
+ * @file syscalls.h
+ * @author Pradosh ([email protected])
+ * @brief 
+ * @version 0.1
+ * @date 2023-12-31
+ * 
+ * @copyright Copyright (c) Pradosh 2023
+ * 
+ */
+#include <basics.h>
+#include <isr.h>
+
+enum {
+    sys_print = 0,
+};
+
+void syscall_handler(InterruptFrame* frame, int syscall_number, ...);

source/kernel/C/interrupts/idt.c

@@ -3,6 +3,7 @@
 #include <keyboard.h>
 #include <ps2-mouse.h>
 #include <pit.h>
+#include <syscalls.h>
 
 extern void* isr_stub_table[];
 extern void* irq_stub_table[];
@@ -66,6 +67,8 @@ void initIdt()
     registerInterruptHandler(0x2C, process_mouse);
     registerInterruptHandler(0x21, process_keyboard);
 
+    registerInterruptHandler(0x30, syscall_handler);
+
     for (uint8_t i = 0; i < 32; i++) 
     {
         setIdtEntry(&idt_entries[i], (uint64_t)isr_stub_table[i], 0x28, 0, 0x8E);

source/kernel/C/logger.c

@@ -227,6 +227,10 @@ void printf(cstring format, ...) {
             case 's':
                 print(va_arg(argp, char*));
                 break;
+
+            case 'c':
+                putc(va_arg(argp, char));
+                break;
             }
         } else {
             putc(*format);

source/kernel/C/syscalls.c

@@ -0,0 +1,22 @@
+/**
+ * @file syscalls.c
+ * @author Pradosh ([email protected])
+ * @brief 
+ * @version 0.1
+ * @date 2023-12-31
+ * 
+ * @copyright Copyright (c) Pradosh 2023
+ * 
+ */
+#include <syscalls.h>
+
+void syscall_handler(InterruptFrame* frame, int syscall_number, ...) {
+    va_list argp;
+    va_start(argp, syscall_number);
+    switch (syscall_number) {
+        case sys_print:
+            print(va_arg(argp, string));
+            break;
+    }
+    va_end(argp);
+}

source/linker/desktop-manager/x86_64.ld

@@ -0,0 +1,33 @@
+/* Tell the linker that we want an x86_64 ELF64 output file */
+OUTPUT_FORMAT(elf64-x86-64)
+OUTPUT_ARCH(i386:x86-64)
+
+/* We want the symbol main to be our entry point */
+ENTRY(fdm_main)
+
+SECTIONS
+{
+    . = 0x100000;
+
+    .text : {
+        *(.text)       /* Code */
+        *(.rodata)     /* Read-only data */
+    }
+
+    .data : {
+        *(.data)       /* Data */
+    }
+
+    .bss : {
+        *(.bss)        /* Uninitialized data */
+    }
+
+    . = ALIGN(4096);   /* Align the following section to a page boundary */
+
+    /* Other sections as needed */
+
+    /DISCARD/ : {
+        *(.comment)
+        *(.eh_frame)
+    }
+}