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Added simple 286 detection code #53

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Added simple 286 detection code #53

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17 changes: 14 additions & 3 deletions src/GLABIOS.ASM
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Original file line number Diff line number Diff line change
Expand Up @@ -4985,6 +4985,7 @@ POST_MEMORY DB 'RAM', 0 ; RAM Memory test
ENDIF
DB '000 ', POST_K_UNIT ; and KB or KiB
DB ' OK', 0
POST_286 DB '286', 0
POST_V20 DB 'V20'
IF INIT_V40 EQ 1
DB '/V40' ; could be a V40
Expand Down Expand Up @@ -10259,11 +10260,21 @@ POST_SYS_VIDEO ENDP
POST_COL_1 POST_CPU, POST_CLR_VAL1 ; display 'CPU' left column
; SI now points to '8088'
CPU_CHECK_TYPE_2:
TEST_GFLAG V20 ; ZF = 0 if V20, ZF = 1 if 8088
JZ CPU_CHECK_TYPE_2_DONE ; jump if 8088
MOV AX, 7000H ; Try to set flag bits 12-14 to 1's
PUSH AX ; Push the test value onto the stack
POPF ; Pop it into the flag register
PUSHF ; Push it back onto the stack
POP AX ; Pop it into AX for check
AND AX, 7000H ; if bits 12-14 are cleared then
JNZ CPU_CHECK_TYPE_V20 ; the chip is a 80286
MOV SI, OFFSET POST_286
JMP CPU_CHECK_TYPE_2_DONE
CPU_CHECK_TYPE_V20:
TEST_GFLAG V20 ; ZF = 0 if V20, ZF = 1 if 8088
JZ CPU_CHECK_TYPE_2_DONE ; jump if 8088
MOV SI, OFFSET POST_V20 ; if not, is V20
CPU_CHECK_TYPE_2_DONE:
CALL OUT_SZ ; write CPU type
CALL OUT_SZ ; write CPU type
POST_COL_END ; end first column

;----------------------------------------------------------------------------;
Expand Down