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109 lines
1.7 KiB
109 lines
1.7 KiB
TITLE STACK - Kernel stack switching code
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include kernel.inc
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ifdef WOW
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include vint.inc
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endif
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;------------------------------------------------------------------------
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; T M P S T A C K S E G M E N T V A R I A B L E S
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;------------------------------------------------------------------------
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sBegin DATA
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assumes CS,CODE
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assumes DS,NOTHING
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assumes ES,NOTHING
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assumes SS,NOTHING
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EVEN
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if KDEBUG
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externW gmove_stack_sig
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endif
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externW gmove_stack
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externW prev_gmove_SP
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externW prev_gmove_SS
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externW ss_sel
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sEnd DATA
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;------------------------------------------------------------------------
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sBegin CODE
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assumes CS,CODE
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assumes SS,NOTHING
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assumes ds,nothing
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assumes es,nothing
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cProc Enter_gmove_stack,<PUBLIC,NEAR>
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cBegin nogen
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mov ax,ds
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SetKernelDS
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cmp prev_gmove_SS,0
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jne gs_fail
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FCLI
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pop gmove_stack
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mov prev_gmove_SS,cx
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mov prev_gmove_SP,sp
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if KDEBUG
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mov gmove_stack_sig,STACK_SIGNATURE
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endif
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smov ss,ds
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mov sp,dataOffset gmove_stack
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FSTI
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mov ds,ax
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ret
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cEnd nogen
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gs_fail:
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kerror ERR_GMEM,<gmove_stack usage error>,prev_gmove_SS,prev_gmove_SP
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jmp gs_fail
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assumes ds,nothing
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assumes es,nothing
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cProc Leave_gmove_stack,<PUBLIC,NEAR>
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cBegin nogen
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mov ax,ds
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SetKernelDS
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cmp prev_gmove_SS,0
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je gs_fail
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if KDEBUG
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push ax
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push cx
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push es
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push di
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lea di, gmove_stack_sig
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smov es, ss
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mov ax, STACK_SIGNATURE
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mov cx, 16
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cld
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repe scasw
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pop di
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pop es
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pop cx
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pop ax
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jne gs_fail
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cmp sp,dataOffset gmove_stack
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jne gs_fail
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endif
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FCLI
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mov ss,prev_gmove_SS
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mov sp,prev_gmove_SP
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push gmove_stack
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mov prev_gmove_SS,0
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FSTI
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mov ds,ax
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ret
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cEnd nogen
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sEND CODE
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end
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