Kernel: Add Utilities::get_rflags(), and thus Interrupts::are_enabled()

kernel/include/interrupts/Interrupts.h

@@ -8,4 +8,6 @@ namespace Interrupts
 
     bool is_in_handler();
     void return_from_handler(Context* context);
+
+    bool are_enabled();
 }

kernel/include/misc/utils.h

@@ -5,4 +5,6 @@ namespace Utilities
 {
     uint64_t get_blocks_from_size(uint64_t blocksize,
                                   uint64_t size); // Returns how many blocks of size blocksize does size occupy.
+
+    uint64_t get_rflags();
 }

kernel/src/interrupts/Interrupts.cpp

@@ -1,4 +1,5 @@
 #include "interrupts/Interrupts.h"
+#include "misc/utils.h"
 #include "trace/StackTracer.h"
 
 void Interrupts::disable()
@@ -24,4 +25,9 @@ void Interrupts::return_from_handler(Context* context)
                  "jmp _asm_interrupt_exit"
                  :
                  : "r"(context));
+}
+
+bool Interrupts::are_enabled()
+{
+    return (Utilities::get_rflags() & 0x200) > 0;
 }

kernel/src/main.asm

@@ -25,4 +25,10 @@ asm_enable_sse:
     mov rax, cr4
     or ax, 3 << 9
     mov cr4, rax
+    ret
+
+global asm_get_rflags
+asm_get_rflags:
+    pushfq
+    pop rax
     ret

kernel/src/misc/utils.cpp

@@ -3,4 +3,10 @@
 uint64_t Utilities::get_blocks_from_size(uint64_t blocksize, uint64_t size)
 {
     return (size + (blocksize - 1)) / blocksize;
+}
+
+extern "C" uint64_t asm_get_rflags();
+uint64_t Utilities::get_rflags()
+{
+    return asm_get_rflags();
 }