Call global constructors

2 files changed, 17 insertions, 4 deletions

diff --git a/src/boot.s b/src/boot.s
index bb446d8..2286152 100644
--- a/src/boot.s
+++ b/src/boot.s
@@ -41,6 +41,8 @@ stack_top:
     bootloader will jump to this position once the kernel has been loaded.
 */
 .section .text
+.extern kernel_constructors
+.extern kernel_main
 .global _start
 .type _start, @function
 _start:
@@ -59,6 +61,7 @@ _start:
 
         pushl %ebx      # push the pointer to the multiboot structure
         pushl %eax      # push the multiboot magic value
+        call kernel_constructors
 
 	/*
 	Enter the high-level kernel. The ABI requires the stack is 16-byte
diff --git a/src/kernel.cc b/src/kernel.cc
index 7aaaa37..37773e1 100644
--- a/src/kernel.cc
+++ b/src/kernel.cc
@@ -15,16 +15,26 @@
 #include "idt.h"
 #include "serial.h"
 
+SerialPort serial0;
+CGA video0;
+
+typedef void (*constructor)();
+
 extern "C" {
+
+constructor start_ctors;
+constructor end_ctors;
+void kernel_constructors() {
+  for (constructor* i = &start_ctors; i != &end_ctors; ++i) (*i)();
+}
+
 void dump_multiboot(uint32_t mb_magic, uint32_t mb_addr);
 void dump_gdt();
 
 void kernel_main([[maybe_unused]] uint32_t mb_magic, [[maybe_unused]] uint32_t mb_addr) {
-  SerialPort s0;
-  if (s0.self_check()) Console::set(&s0);
+  if (serial0.self_check()) Console::set(&serial0);
 
-  CGA terminal;
-  Console::set(&terminal);
+  Console::set(&video0);
 
   printk("Hello, kernel World!\n");