# along with this program. If not, see <https://www.gnu.org/licenses/>.
.code32
- .section .startup
+ .section .startup,"ax"
.extern _bss_start
.extern _bss_end
+ .extern pcboot_main
+ .extern wait_vsync
+ .extern kb_getkey
+ # move the stack to the top of the conventional memory
+ cli
+ movl $0x80000, %esp
+
+ # zero the BSS section
xor %eax, %eax
- mov _bss_start, %edi
- mov _bss_size, %ecx
+ mov $_bss_start, %edi
+ mov $_bss_size, %ecx
+ cmp $0, %ecx
+ jz skip_bss_zero
shr $4, %ecx
rep stosl
+skip_bss_zero:
+ call pcboot_main
+ # pcboot_main never returns
+0: cli
+ hlt
+ jmp 0b
+ .global logohack
logohack:
+ pusha
+
# copy palette
mov $logo_pal, %esi
xor %cl, %cl
incl frameno
- # wait vsync
- mov $0x3da, %dx
-0: in %dx, %al
- and $8, %al
- jnz 0b
-0: in %dx, %al
- and $8, %al
- jz 0b
+ call wait_vsync
+
+ # check for escape keypress
+ call kb_getkey
+ cmp $27, %eax
+ jz 0f
+
jmp frameloop
+0: popa
+ ret
+
xval: .long 0
yval: .long 0
frameno: .long 0
-numbuf: .space 16
-
logo_pal:
.incbin "logo.pal"