36,6 → 36,13 |
Vortex86SoCnum = ($ - Vortex86SoClist) / 4 ; Calculate the total number of known Vortex86 CPUs (if id=Vortex86SoCnum+1 --> unknown SoC) |
endg |
|
; When in debug mode, perform SoC detection regardless of the actual CPU vendor (even for vendors other than DMP) |
; When in normal (not debug) mode, check the CPU vendor first, and perform SoC detection only if vendor is 'Vortex86 SoC' |
if ~ VORTEX86DEBUG |
cmp [cpu_vendor], 'Vort' |
jnz .Vortex86end ; If the CPU vendor is not 'Vortex86 SoC', skip the SoC detection |
end if |
|
mov dx, 0xcf8 ; CF8h = Vortex86 PCI Configuration Address port |
mov eax, 0x80000090 ; 0x80000090 = Starting PCI address to read from (32-bit register - accessed as DWORD) |
out dx, eax ; Send request to PCI address port to retrieve data from this address |
42,8 → 49,7 |
mov dx, 0xcfc ; CFCh = Vortex86 PCI Configuration Data port |
in eax, dx ; Read data (SoC type) from PCI data port |
|
if VORTEX86DEBUG |
; // Used for debug purposes: testing in emulator and in non-Vortex86 CPU computers |
if VORTEX86DEBUG ; When in debug mode, pretend that we received port output equal to "VORTEX86DEBUGVALUE" |
mov eax, VORTEX86DEBUGVALUE |
end if |
|
55,10 → 61,9 |
cmp ax, 4d44h ; Check whether it's Vortex86 family (all Vortex86 SoC have ID in form of "0xNN504d44") |
jnz .notVortex86 |
shr eax, 16 ; Discard lower word in EAX which is always 4d44h in Vortex86 family |
cmp al, 50h ; The 3rd byte is always 50h in Vortex86 SoC |
cmp al, 50h ; The 3rd byte is always 50h in Vortex86 SoC (if this is the case, we need just the highest byte) |
jnz .notVortex86 |
shr ax, 8 ; Discard 3rd byte in EAX, the highest byte determines the SoC type |
mov bl, al ; Copy SoC type to BL since EAX (that contains AL) is used implicitly in "LODSD" command below |
mov bl, ah ; Copy SoC type to BL since EAX (that includes AH) is used implicitly in "LODSD" command below |
mov esi, Vortex86SoClist ; ESI points to the start of Vortex86SoClist (used implicitly in "LODSD" command below) |
xor ecx, ecx ; Zero ECX (it is used as counter) |
cld ; Clears the DF flag in the EFLAGS register (DF=0 --> String operations increment ESI) |
83,7 → 88,7 |
|
.unknownVortex86: |
mov [Vortex86CPUid], cl ; Save the CPUid (Vortex86SoCnum+1=Unknown Vortex86) |
DEBUGF 1, "unknown Vortex86 CPU (has id=%d, last known is %d)\n", [Vortex86CPUid]:1, Vortex86SoCnum |
DEBUGF 1, "unknown Vortex86 CPU (id=%d, last known is %d)\n", [Vortex86CPUid]:1, Vortex86SoCnum |
jmp .Vortex86end |
|
.notVortex86: ; In case this register is used by other CPUs for other purpose, it's interesting what it contains |