michaelkuc6/blog_os
1
0
Fork 0
mirror of https://github.com/phil-opp/blog_os.git synced 2025-12-16 22:37:49 +00:00
Code Issues Projects Releases Wiki Activity

Fix test_long_mode (closes #4)

Browse Source
This commit is contained in:
Philipp Oppermann
2015-10-25 01:55:31 +02:00
parent ca9c3fdcf4
commit 76ea95acf5
1 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
_posts/2015-08-25-entering-longmode.md
View File

@@ -125,10 +125,10 @@ test_long_mode:
cpuid ; CPU identification. cpuid ; CPU identification.
cmp eax, 0x80000001 ; Compare the A-register with 0x80000001. cmp eax, 0x80000001 ; Compare the A-register with 0x80000001.
jb .no_long_mode ; It is less, there is no long mode. jb .no_long_mode ; It is less, there is no long mode.
mov eax, 0x80000000 ; Set the A-register to 0x80000000. mov eax, 0x80000001 ; Set the A-register to 0x80000001.
cpuid ; CPU identification. cpuid ; CPU identification.
cmp eax, 0x80000001 ; Compare the A-register with 0x80000001. test edx, 1 << 29 ; Test if the LM-bit, which is bit 29, is set in the D-register.
jb .no_long_mode ; It is less, there is no long mode. jz .no_long_mode ; They aren't, there is no long mode.
ret ret
.no_long_mode: .no_long_mode:
mov al, "2" mov al, "2"