From 25a24b8b167a7cb28c622039ea30e4afd166cd83 Mon Sep 17 00:00:00 2001
From: Clément Sibille <claymeuns@protonmail.com>
Date: Mon, 4 Oct 2021 13:30:31 +0200
Subject: Make kernel print hello world using the VGA text buffer

---
 boot/boot.S    | 36 ++++++++++++++++++++++++++++++++++++
 boot/linker.ld | 28 ++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+)
 create mode 100644 boot/boot.S
 create mode 100644 boot/linker.ld

(limited to 'boot')

diff --git a/boot/boot.S b/boot/boot.S
new file mode 100644
index 0000000..6164029
--- /dev/null
+++ b/boot/boot.S
@@ -0,0 +1,36 @@
+MULTIBOOT_ALIGN EQU 1<<0                                      ; Align loaded modules on page boundaries
+MULTIBOOT_MEMINFO EQU 1<<1                                    ; Provide memory map
+MULTIBOOT_FLAGS EQU MULTIBOOT_ALIGN | MULTIBOOT_MEMINFO       ; Multiboot flags
+MULTIBOOT_MAGIC EQU 0x1BADB002                                ; Multiboot 1 magic number
+MULTIBOOT_CHECKSUM EQU -(MULTIBOOT_MAGIC + MULTIBOOT_FLAGS) ; Checksum
+
+SECTION .multiboot
+ALIGN 4
+DD MULTIBOOT_MAGIC
+DD MULTIBOOT_FLAGS
+DD MULTIBOOT_CHECKSUM
+
+SECTION .bss
+ALIGN 16
+stack_bottom:
+RESB 16384 ; 16 KiB stack
+stack_top:
+
+
+SECTION .text
+GLOBAL _start:function (_start.end - _start)
+_start:
+    MOV esp, stack_top
+    EXTERN kmain
+    CALL kmain
+    CLI
+.hang: HLT
+    JMP .hang
+.end:
+
+
+
+
+
+
+
diff --git a/boot/linker.ld b/boot/linker.ld
new file mode 100644
index 0000000..a725f4e
--- /dev/null
+++ b/boot/linker.ld
@@ -0,0 +1,28 @@
+ENTRY(_start)
+
+SECTIONS
+{
+    . = 1M;
+
+    .text BLOCK(4K) : ALIGN(4K)
+    {
+		*(.multiboot)
+		*(.text)
+    }
+
+    .rodata BLOCK(4K) : ALIGN(4K)
+    {
+        *(.rodata)
+    }
+
+    .data BLOCK(4K) : ALIGN(4K)
+    {
+        *(.data)
+    }
+
+    .bss BLOCK(4K) : ALIGN(4K)
+    {
+        *(COMMON)
+        *(.bss)
+    }
+}
\ No newline at end of file
-- 
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