VM8086 Support, Starting on VESA Driver

[tpg/acess2.git] / Kernel / arch / x86 / start.asm

diff --git a/Kernel/arch/x86/start.asm b/Kernel/arch/x86/start.asm
index f1d1ea7..b1884ae 100644 (file)
--- a/Kernel/arch/x86/start.asm
+++ b/Kernel/arch/x86/start.asm
@@ -5,6 +5,9 @@
 \r
 KERNEL_BASE    equ 0xC0000000\r
 \r
+[extern __load_addr]\r
+[extern __bss_start]\r
+[extern gKernelEnd]\r
 [section .multiboot]\r
 mboot:\r
     ; Multiboot macros to make a few lines later more readable\r
@@ -20,6 +23,37 @@ mboot:
     dd MULTIBOOT_CHECKSUM\r
        dd mboot - KERNEL_BASE  ;Location of Multiboot Header\r
        \r
+; Multiboot 2 Header\r
+mboot2:\r
+    MULTIBOOT2_HEADER_MAGIC    equ 0xE85250D6\r
+    MULTIBOOT2_HEADER_ARCH     equ 0\r
+    MULTIBOOT2_HEADER_LENGTH   equ (mboot2_end-mboot2)\r
+    MULTIBOOT2_CHECKSUM        equ -(MULTIBOOT2_HEADER_MAGIC + MULTIBOOT2_HEADER_ARCH + MULTIBOOT2_HEADER_LENGTH)\r
+       \r
+    dd MULTIBOOT2_HEADER_MAGIC\r
+    dd MULTIBOOT2_HEADER_ARCH\r
+    dd MULTIBOOT2_HEADER_LENGTH\r
+    dd MULTIBOOT2_CHECKSUM\r
+       ; MBoot2 Address Header\r
+       dw      2, 0\r
+       dd      8 + 16\r
+       dd      mboot2  ; Location of Multiboot Header\r
+       dd      __load_addr - KERNEL_BASE       ; Kernel Load base\r
+       dd      __bss_start - KERNEL_BASE       ; Kernel Data End\r
+       dd      gKernelEnd - KERNEL_BASE        ; Kernel BSS End\r
+       ; MBoot2 Entry Point Tag\r
+       dw      3, 0\r
+       dd      8 + 4\r
+       dd      start - KERNEL_BASE\r
+       ; MBoot2 Module Alignment Tag\r
+       dw      6, 0\r
+       dd      12      ; ???\r
+       dd      0       ; Search me, seems it wants padding\r
+       ; Terminator\r
+       dw      0, 0\r
+       dd      8\r
+mboot2_end:\r
+       \r
 [section .text]\r
 [extern kmain]\r
 [global start]\r