While getting pqmagic(*) working off memdisk under [pxe|iso]linux I
noticed that the the whole thing freezes whenever the mouse moves under
I/O against memdisk [most notably when you open help index]. Attached
patch [relative to 1.67] cured the problem.
Cheers. Andy.
(*) real-mode [yet] GUI application running under DR-DOS.
*** ./memdisk/memdisk.asm.orig Sun Feb 3 22:37:55 2002
--- ./memdisk/memdisk.asm Thu Mar 28 17:45:51 2002
***************
*** 386,391 ****
--- 386,398 ----
push ebx
push edx
push ebp
+ ; apparently cli after int 15h below is not
sufficient:-(
+ ; we've got to mask hardware interrupts in PIC as well!
+ xor eax,eax
+ in al,21h
+ push eax
+ or al,0xfe ; leave timer on
+ out 21h,al
.copy_loop:
push esi
push edi
***************
*** 420,425 ****
--- 427,434 ----
jnz .copy_loop
; CF = 0
.error:
+ pop eax
+ out 21h,al ; restore hardware interrupt mask
pop ebp
pop edx
pop ebx
noticed that the the whole thing freezes whenever the mouse moves under
I/O against memdisk [most notably when you open help index]. Attached
patch [relative to 1.67] cured the problem.
Cheers. Andy.
(*) real-mode [yet] GUI application running under DR-DOS.
*** ./memdisk/memdisk.asm.orig Sun Feb 3 22:37:55 2002
--- ./memdisk/memdisk.asm Thu Mar 28 17:45:51 2002
***************
*** 386,391 ****
--- 386,398 ----
push ebx
push edx
push ebp
+ ; apparently cli after int 15h below is not
sufficient:-(
+ ; we've got to mask hardware interrupts in PIC as well!
+ xor eax,eax
+ in al,21h
+ push eax
+ or al,0xfe ; leave timer on
+ out 21h,al
.copy_loop:
push esi
push edi
***************
*** 420,425 ****
--- 427,434 ----
jnz .copy_loop
; CF = 0
.error:
+ pop eax
+ out 21h,al ; restore hardware interrupt mask
pop ebp
pop edx
pop ebx