usermode programs can take input using write syscall, made test shell

Makefile

@@ -36,6 +36,10 @@ $(BUILDDIR)/%.o: */%.asm
 qemu: kernel
 	qemu-system-i386 $(QEMUFLAGS)
 
+test: kernel
+	rm image.img
+	nasm -fbin test.asm -o image.img
+
 iso: kernel
 	cp $(BUILDDIR)/kernel.bin iso/boot/kernel.bin
 	grub-mkrescue -o  $(BUILDDIR)/andewOS.iso iso/

src/kmain.c

@@ -31,14 +31,21 @@ struct stack_frame {
 
 void syscall_read(struct stack_frame regs) {
     uint32_t fd    = regs.edi;
- //   char *buf      = (char *)regs.esi;
+    char *buf      = (char *)regs.esi;
     uint32_t count = regs.edx;
 
-    if (fd == FD_STDOUT) {
-        int pages = count / BLOCK_SIZE;
-        if (pages == 0) {
-//            memcpy(buf, stdout.data, count);
-        }
+    if (fd == FD_STDIN) {
+        extern char shell_buffer[512];
+        extern int shell_index;
+        asm volatile ("sti" ::);
+
+        while (shell_buffer[shell_index-1] != '\n')
+            asm volatile ("pause" ::);
+        asm volatile ("cli" ::);
+
+        memcpy(buf, shell_buffer, count);
+        memset(shell_buffer, 0, 512);
+        shell_index = 0;
     }
 }
 

src/ps2.c

@@ -171,6 +171,7 @@ void ps2_handler() {
             break;
         case KBD_ENTER:
             printf("\n");
+            /*
             if (strcmp(shell_buffer, "PINGAS") == 0) {
                 printf("andew pingas detected");
             } else if (strcmp(shell_buffer, "HELLO") == 0) {
@@ -188,7 +189,8 @@ void ps2_handler() {
                 shell_buffer[i] = 0;
             }
             shell_index = 0;
-            printf("\n$ ");
+            */
+            shell_buffer[shell_index++] = '\n';
             break;
         case KBD_LCTRL:
             // Handle left control key

test.a

@@ -1,15 +0,0 @@
-[org 0x6000]
-[bits 32]
-_start:
-    push ebp
-    mov ebp, esp
-    ; Syscall #1 = write
-    mov eax, 1
-    ; File descriptor = stdout
-    mov edi, 0
-    ; ESI = buffer 
-    mov esi, buf
-    int 0x80
-    jmp $
-
-buf: db "Andew skibidi pomni", 0

test.asm

@@ -0,0 +1,31 @@
+[org 0x6000]
+[bits 32]
+_start:
+    push ebp
+    mov ebp, esp
+.loop:
+    ; print shell prompt
+    mov eax, 1
+    mov edi, 0
+    mov esi, prompt
+    mov edx, 3
+    int 0x80
+
+    ; read input
+    mov eax, 0 
+    mov edi, 1
+    mov esi, buf
+    mov edx, 512
+    int 0x80
+
+    ; echo what was wrote
+    mov eax, 1
+    mov edi, 0
+    mov esi, buf
+    mov edx, 512
+    int 0x80
+
+    jmp .loop
+    jmp $
+
+prompt: db "> ", 0