| 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 |