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kernel
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Fix memory break in NUL device

This commit is contained in:
lpproj 2016-02-06 13:43:34 +09:00
parent e024f72a4c
commit cab8092ad6
2 changed files with 6 additions and 4 deletions
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1
kernel/io.asm
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@ -212,6 +212,7 @@ uUnitNumber dw 0
; at any time. The request is stored into memory in the one and only ; at any time. The request is stored into memory in the one and only
; location available for that purpose. ; location available for that purpose.
; ;
global GenStrategy
GenStrategy: GenStrategy:
mov word [cs:_ReqPktPtr],bx mov word [cs:_ReqPktPtr],bx
mov word [cs:_ReqPktPtr+2],es mov word [cs:_ReqPktPtr+2],es

9
kernel/kernel.asm
View File

@ -287,10 +287,9 @@ segment CONST
; NUL device strategy ; NUL device strategy
; ;
global _nul_strtgy global _nul_strtgy
extern GenStrategy
_nul_strtgy: _nul_strtgy:
mov word [cs:_ReqPktPtr],bx ;save rq headr jmp far GenStrategy
mov word [cs:_ReqPktPtr+2],es
retf
; ;
; NUL device interrupt ; NUL device interrupt
@ -299,7 +298,9 @@ _nul_strtgy:
_nul_intr: _nul_intr:
push es push es
push bx push bx
les bx,[cs:_ReqPktPtr] ;es:bx--> rqheadr mov bx,LGROUP
mov es,bx
les bx,[es:_ReqPktPtr] ;es:bx--> rqheadr
cmp byte [es:bx+2],4 ;if read, set 0 read cmp byte [es:bx+2],4 ;if read, set 0 read
jne no_nul_read jne no_nul_read
mov word [es:bx+12h],0 mov word [es:bx+12h],0