Implement the reboot command

Makefile

@@ -9,6 +9,7 @@ MICRO_KERNEL_UTILS_SRC=$(wildcard micro_kernel/utils/*.asm)
 micro_kernel.bin: $(MICRO_KERNEL_SRC) $(MICRO_KERNEL_UTILS_SRC)
 	nasm -w+all -f bin -o micro_kernel.bin micro_kernel/micro_kernel.asm
 	nasm -D DEBUG -g -w+all -f elf64 -o micro_kernel.g micro_kernel/micro_kernel.asm
+	bash addresses.bash
 
 KERNEL_FLAGS=-masm=intel -Ikernel/include/ -O1 -std=c++11 -Wall -Wextra -fno-exceptions -fno-rtti -ffreestanding
 KERNEL_LINK_FLAGS=-std=c++11 -T linker.ld -ffreestanding -O1 -nostdlib

addresses.bash

@@ -5,12 +5,12 @@ function generate_address {
     hex_address="0x$address"
     hex_offset=`echo "obase=16; $(($hex_address+0x1000))" | bc`
 
-    echo "#define asm_$1 0x$hex_offset" >> src/addresses.hpp
+    echo "#define asm_$1 0x$hex_offset" >> kernel/include/addresses.hpp
 }
 
-echo "#ifndef ADDRESSES_H" > src/addresses.hpp
-echo "#define ADDRESSES_H" >> src/addresses.hpp
+echo "#ifndef ADDRESSES_H" > kernel/include/addresses.hpp
+echo "#define ADDRESSES_H" >> kernel/include/addresses.hpp
 
 generate_address "register_irq_handler"
 
-echo "#endif" >> src/addresses.hpp
+echo "#endif" >> kernel/include/addresses.hpp

kernel/include/addresses.hpp

@@ -1,4 +1,4 @@
 #ifndef ADDRESSES_H
 #define ADDRESSES_H
-#define asm_register_irq_handler 0x272E
+#define asm_register_irq_handler 0x276D
 #endif

kernel/include/kernel_utils.hpp

@@ -13,6 +13,14 @@ void register_irq_handler(void (*handler)()){
         );
 }
 
+template<uint8_t INT>
+void interrupt(){
+    asm ("int %0"
+        :
+        : "i" (INT)
+        );
+}
+
 uint8_t in_byte(uint16_t _port);
 void out_byte (uint16_t _port, uint8_t _data);
 

kernel/src/kernel.cpp

@@ -57,8 +57,21 @@ void keyboard_handler(){
     }
 }
 
-void exec_command(){
-    k_print("The command \"");
-    k_print(current_input);
-    k_print_line("\" does not exist");
+bool str_equals(const char* a, const char* b){
+    while(*a && *a == *b){
+        ++a;
+        ++b;
+    }
+
+    return *a == *b;
+}
+
+void exec_command(){
+    if(str_equals("reboot", current_input)){
+        interrupt<60>();
+    } else {
+        k_print("The command \"");
+        k_print(current_input);
+        k_print_line("\" does not exist");
+    }
 }

micro_kernel/interrupts.asm

@@ -208,6 +208,11 @@ install_irqs:
 
     ret
 
+install_syscalls:
+    IDT_SET_GATE 60, syscall_reboot, LONG_SELECTOR-GDT64, 0x8E
+
+    ret
+
 ; r8 = irq
 ; r9 = handler address
 register_irq_handler:
@@ -215,6 +220,25 @@ register_irq_handler:
 
     ret
 
+; Syscalls
+
+; Reboot the computer
+; No parameters
+syscall_reboot:
+    cli
+
+    push rax
+
+    mov al, 0x64
+    or al, 0xFE
+    out 0x64, al
+    mov al, 0xFE
+    out 0x64, al
+
+    pop rax
+
+    iretq
+
 ; Data structures
 
 ; each idt entry is form like that:

micro_kernel/micro_kernel.asm

@@ -99,6 +99,9 @@ lm_start:
     ; Install all IRQs
     call install_irqs
 
+    ; Install custom syscalls
+    call install_syscalls
+
     sti
 
     call install_timer