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Perform Vortex86 detection only if CPU vendor is 'Vortex86 SoC' 

git-svn-id: svn://kolibrios.org@4272 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Yogev Ezra 2013-11-21 15:12:39 +00:00
parent f7431907f6
commit 42203528ce
1 changed files with 11 additions and 6 deletions
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17
kernel/trunk/detect/vortex86.inc
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@ -36,14 +36,20 @@ Vortex86SoClist: ; List of Vortex86 CPUs known today. Add
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
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 @@ end if
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 @@ end if
.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