X-Git-Url: http://git.joshuawise.com/netwatch.git/blobdiff_plain/a46bffee03170f9f38004ce996dd7b22343fe6f8..037ce545946a8bc2d482d24e3bbdb6174a93ca46:/aseg/aseg.asm diff --git a/aseg/aseg.asm b/aseg/aseg.asm index b9ae424..7380dc0 100644 --- a/aseg/aseg.asm +++ b/aseg/aseg.asm @@ -1,9 +1,9 @@ org 0xA8000 [bits 16] entry: - mov ax, 0xA800 - mov ds, ax ; Take us out of flat unreal mode, and - mov es, ax ; put us in true real mode. + mov ax, 0xA800 ; Take us out of flat unreal mode, + mov ds, ax ; and put us in true real mode. + mov es, ax mov fs, ax mov gs, ax mov ss, ax @@ -21,40 +21,24 @@ continue: mov fs, ax mov gs, ax mov ss, ax - mov esp, [dataptr] - - mov al, [needclear] - cmp al, 0 - jz noclear - mov al, 0 ; clear BSS - mov edi, [dataptr+4] - mov ecx, [dataptr+8] - rep stosb - mov [needclear], al + mov esp, [dataptr] ; Load stack pointer. -noclear: - mov eax, [dataptr+12] ; jump into C - call eax + mov eax, [dataptr+4] ; Load target jump address + call eax ; then jump into C. rsm ; and leave SMM align 0x4 gdtr: - db 0x27, 0x00 + db 0x17, 0x00 dd gdt align 0x4 gdt: - db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 + db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ; initial null entry db 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x93, 0xCF, 0x00 ; data segment db 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x9B, 0xCF, 0x00 ; code segment - db 0xFF, 0xFF, 0x00, 0x80, 0x0A, 0x9B, 0xCF, 0x00 ; code segment for trampoline - -needclear: - db 0x01 dataptr: ; 4 bytes of stack top - ; 4 bytes of BSS start - ; 4 bytes of BSS length ; 4 bytes of C entry point ; These show up