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| author | Paolo Bonzini <pbonzini@redhat.com> | 2015-05-21 16:40:24 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-05-21 16:42:22 +0200 |
| commit | 20b9dd75c8525003bd53243f52766dde9daace46 (patch) | |
| tree | 246c74ad4f66ce3ca7156aed9c04c03fadfaac29 /linuxboot.c | |
| parent | 42e45cad86416e5ca78c3f07711d1ae71827748c (diff) | |
| download | qboot-20b9dd75c8525003bd53243f52766dde9daace46.zip qboot-20b9dd75c8525003bd53243f52766dde9daace46.tar.gz qboot-20b9dd75c8525003bd53243f52766dde9daace46.tar.bz2 | |
add a 16-bit data segment
Otherwise the real mode data segments keep G=D=1.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'linuxboot.c')
| -rw-r--r-- | linuxboot.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/linuxboot.c b/linuxboot.c index cc64811..9671fd7 100644 --- a/linuxboot.c +++ b/linuxboot.c @@ -130,7 +130,9 @@ void boot_bzimage(struct linuxboot_args *args) */ asm("pm16_boot_linux:" ".code16;" - "mov $0, %eax; mov %eax, %cr0;" + "mov $0x20, %ax; mov %ax, %ds; mov %ax, %es;" + "mov %ax, %fs; mov %ax, %gs; mov %ax, %ss;" + "xor %eax, %eax; mov %eax, %cr0;" "ljmpl $0xf000, $(1f - 0xf0000); 1:" "mov %bx, %ds; mov %bx, %es;" "mov %bx, %fs; mov %bx, %gs; mov %bx, %ss;" |