metalsvm/arch/x86/kernel/string64.asm
Stefan Lankes 227cc19890 add alpha version of x64 support
New features:
- support of kernel tasks in 64bit mode
- support of LwIP in 64bit mode

Missing features in 64bit mode
- user-level support
- APIC support => SMP support

To create a 64bit version of the MetalSVM kernel, the compiler flags “-m64 -mno-red-zone” and the assembler flags “-felf64” has to be used. Please use qemu-system-x86_64 as test platform.

Notice, metalsvm.elf is a 32bit ELF file. However, it contains (beside the startup code) only 64bit code. This is required because GRUB doesn’t boot 64bit ELF kernels. Therefore, for disassembling via objdump the flag  “-M x86-64” has to be used.
2012-06-10 08:05:24 +02:00

79 lines
1.8 KiB
NASM

;
; Written by the Chair for Operating Systems, RWTH Aachen University
;
; NO Copyright (C) 2010-2012, Stefan Lankes
; consider these trivial functions to be public domain.
;
; These functions are distributed on an "AS IS" BASIS,
; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;
[BITS 64]
SECTION .text
global strcpy
strcpy:
push rdi
L1:
lodsb
stosb
test al, al
jne L1
pop rax
ret
global strncpy
strncpy:
push rdi
mov rcx, rdx
L2:
dec rcx
js L3
lodsb
stosb
test al, al
jne L1
rep
stosb
L3:
pop rax
ret
%if 0
; The following function is derived from JamesM's kernel development tutorials
; (http://www.jamesmolloy.co.uk/tutorial_html/)
global copy_page_physical
copy_page_physical:
push esi ; According to __cdecl, we must preserve the contents of ESI
push edi ; and EDI.
pushf ; push EFLAGS, so we can pop it and reenable interrupts
; later, if they were enabled anyway.
cli ; Disable interrupts, so we aren't interrupted.
; Load these in BEFORE we disable paging!
mov edi, [esp+12+4] ; Destination address
mov esi, [esp+12+8] ; Source address
mov edx, cr0 ; Get the control register...
and edx, 0x7fffffff ; and...
mov cr0, edx ; Disable paging.
cld
mov ecx, 0x400 ; 1024*4bytes = 4096 bytes = page size
rep movsd ; copy page
mov edx, cr0 ; Get the control register again
or edx, 0x80000000 ; and...
mov cr0, edx ; Enable paging.
popf ; Pop EFLAGS back.
pop edi ; Get the original value of EDI
pop esi ; and ESI back.
ret
%endif
SECTION .note.GNU-stack noalloc noexec nowrite progbits