Load ELF kernel instead of flat binary

[nameless-os.git] / boot / x86 / stage3 / loader.s

diff --git a/boot/x86/stage3/loader.s b/boot/x86/stage3/loader.s
index 9ed71021c5d42b291033df366f9231f3b8522b44..87598f4b0c93a6d95cbb1aa21dcf6a87723ff1da 100644 (file)
--- a/boot/x86/stage3/loader.s
+++ b/boot/x86/stage3/loader.s
@@ -1,9 +1,7 @@
 bits 16
 cpu 686
 
-extern enable_paging
-extern map_range
-extern set_up_page_directory
+extern run_kernel
 
 section .text
 %include "../fat32/fat32-structs.s"
@@ -63,9 +61,11 @@ _start:
        pop si
        pop cx
        print kernel_found
+       mov eax, [es:di+dir_entry.filesize]
+       mov [KERNEL_SIZE], eax
        mov ax, [es:di+dir_entry.firstclushi]
        shl eax, 16
-       mov ax, [es:di+(dir_entry.firstcluslo)]
+       mov ax, [es:di+dir_entry.firstcluslo]
        call print_dword
        mov edi, 0x100000
        print kernel_loading
@@ -177,47 +177,18 @@ in_protected:
        mov fs, ax
        mov gs, ax
 
-       push dword 0
-       push 0xc0003000
-       push 0xc0000000
-       push 0x103000
+       push dword [KERNEL_SIZE]
        push 0x100000
-       call map_range
-       cmp eax, 0
-       jne .error
-       add esp, 20
-       push dword 2
-       push 0xc0009000
-       push 0xc0003000
-       push 0x109000
-       push 0x103000
-       call map_range
-       cmp eax, 0
-       jne .error
-       add esp, 20
-       push dword 2
-       push 0x100000
-       push dword 0
-       push 0x100000
-       push dword 0
-       call map_range
-       cmp eax, 0
-       jne .error
-       add esp, 20
-
-       call set_up_page_directory
-       call enable_paging
-
-       jmp 0xc0000000
-       nop
-.error:
-       mov dword [0xb8000], 0xcf28cf3a
-       hlt
-       jmp $-1
+       push ebx
+       push edi
+       call run_kernel
+
+section .bss
+KERNEL_SIZE: resd 1
 
 section .rodata
 
-kernel_name: db "KERNEL  BIN"
+kernel_name: db "KERNEL  ELF"
 begin: db "Nameless Bootloader revision ", GIT_REVISION, 0xd, 0xa, 0
 a20_enabled: db "A20 has been enabled", 0xd, 0xa, "Searching for kernel...", 0xd, 0xa, 0
 a20_fail: db "Failed to enable A20, giving up!", 0xd, 0xa, 0
@@ -225,7 +196,7 @@ crit_err: db "A critical error occurred, dumping registers now: ", 0xd, 0xa, 0
 kernel_found: db "Found kernel at cluster ", 0
 kernel_loading: db 0xd, 0xa, "Loading kernel...", 0xd, 0xa, 0
 kernel_loaded: db "Kernel successfully loaded.", 0xd, 0xa, "Setting up kernel environment and running kernel...", 0xd, 0xa, 0
-missing_kernel: db "Could not find KERNEL.BIN", 0xd, 0xa, 0
+missing_kernel: db "Could not find KERNEL.ELF", 0xd, 0xa, 0
 eax_s: db "EAX: ", 0
 ebx_s: db "EBX: ", 0
 ecx_s: db "ECX: ", 0