发布时间 : 星期日 文章PCI Configuration更新完毕开始阅读e306a0ed0975f46527d3e190
ret
;----------------------------------------------------------- -----------; ; STACK REQUIRED ; ; ; ; Input : (AL) Mask of PCI register bits to test. ; ; (optional) ; ; (AH) Index of PCI register to access. ; ; (DL) 7:3 PCI device # ; ; 2:0 PCI function # on device ; ; (DH) 7:0 PCI bus # of device ; ; ;
; Output: (AL) Value read from chip set register. ; ; (ZF) ZR Corresponding bits in chip set ; ; register to mask are all zero. ; ; NZ Corresponding bits in chip set ; ; register to mask has at least ; ; one bit set. ; ; ; ; Register destroyed : (AL) ; ; NOTE : ;
; * Do not invoke with \ Invoke with \; ; * Do not change IF status. ; ;----------------------------------------------------------------------- ;
read_pci PROC NEAR
push edx push eax pushf
xchg movzx shl bts mov and
ax,dx eax,ax eax,8 eax,31 al,dh al,0fch
; (eax) = device & func # ; (eax) = dev & func # in ; proper position.
; (al) = reg # to access. ; (eax) = proper config enb.
shl mov edx,16
dx,00cf8h
; (dx) = CONFIG_ADDRESS
cli out jcxz jcxz shr and or in jcxz jcxz mov popf pop
test
mov pop
ret
read_pci
dx,eax short $+2 short $+2 edx,24 dl,003h dx,00cfch al,dx short $+2 short $+2
dl,al
eax al,dl
al,dl edx
; (dl) = reg # to access.
; (dl) = byte to access of reg ; (dx) = CONFIG_DATA
; (al) = data read from reg ; For returning proper flag info.
ENDP
? Host/PCI Bridge:
通常被称为北桥(North Bridge),它连接主处理器总线与root PCI 总线. ? PCI-to-ISA Bridge:
通常被称为南桥(South Bridge),它连接root PCI总线与ISA(或EISA) 总线,南桥通常还整合中断控制器(Interrupt Controller),IDE控制器(IDE Controller),USB Host控制器(USB Controller)与DMA控制器(DMA Controller). ? PCI-to-PCI Bridge:
它连接root PCI总线与PCI总线