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| author | Jeffrey Armstrong <jeff@approximatrix.com> | 2024-11-06 16:47:33 -0500 |
|---|---|---|
| committer | Jeffrey Armstrong <jeff@approximatrix.com> | 2024-11-06 16:47:33 -0500 |
| commit | f1d017401b0efef229a45d1b4ffeca95a287594b (patch) | |
| tree | bebdddcf994342af0c4188a2d8cc864e56e51317 /asm | |
| download | GWFetch-f1d017401b0efef229a45d1b4ffeca95a287594b.tar.gz GWFetch-f1d017401b0efef229a45d1b4ffeca95a287594b.zip | |
Initial commit with functioning CPU detection code
Diffstat (limited to 'asm')
| -rw-r--r-- | asm/386q.asm | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/asm/386q.asm b/asm/386q.asm new file mode 100644 index 0000000..4496d66 --- /dev/null +++ b/asm/386q.asm @@ -0,0 +1,70 @@ + push bp
+ mov bp, sp
+
+ ; push zero onto the stack and pop it into flags.
+ ; some bits won't change
+ xor ax,ax
+ push ax
+ popf
+ pushf
+ pop ax
+
+ and ax, 0xf000 ;0f000h
+ cmp ax, 0xf000 ;0f000h
+ je lessthantwoeightsix
+
+ ; marked as 286 (2)
+ mov dl, 2
+
+ mov ax, 0x7000 ;7000h
+ push ax
+ popf
+
+ pushf
+ pop ax
+ and ax, 0x7000 ;7000h
+ jz alldone
+
+ ; mark as 386 (3)
+ inc dl
+
+ jmp alldone
+
+lessthantwoeightsix:
+
+ mov dl, 1
+
+ mov al, 0xff ;0ffh
+ mov cl, 0x21 ;21h
+ shr al, cl
+
+ ; if the shift leaves zero, it's a 8088 class cpu, else 80186/88
+ jnz alldone
+
+ ; Lets see if we have a V20/V30 (V)
+ mov dl, 0x56 ;056h
+
+ sti
+ push si
+
+ mov si, 0
+ mov cx, 0xffff ;0ffffh
+ ;rep lods [BYTE PTR es:si]
+ rep lodsb
+
+ pop si
+
+ or cx, cx
+ jz alldone
+
+ ; mark as a 8088/8086 (0)
+ mov dl, 0
+
+alldone:
+ ; store in ax
+ xor dh, dh
+
+ mov di, [bp]+6
+ mov [di], dx
+ pop bp
+ retf 2
\ No newline at end of file |