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atapi!IdeReadWrite函数分析中.txt

news 来源：原创 2025/6/2 11:48:17

第一部分：

if (deviceExtension->DeviceFlags[Srb->TargetId] & DFLAGS_LBA) {

        SelectIdeDevice(baseIoAddress1,
                        Srb->TargetId,
                        (IDE_LBA_MODE | ((startingSector & 0x0f000000) >> 24)));

        IdePortOutPortByte (
                           baseIoAddress1->BlockNumber,
                           (UCHAR) ((startingSector & 0x000000ff) >> 0));
        IdePortOutPortByte (
                           baseIoAddress1->CylinderLow,
                           (UCHAR) ((startingSector & 0x0000ff00) >> 8));

        IdePortOutPortByte (
                           baseIoAddress1->CylinderHigh,
                           (UCHAR) ((startingSector & 0x00ff0000) >> 16));

第二部分：
//
// Device selection constants used for programming the device/head register.
//
#define IDE_LBA_MODE 0xE0

cPublicProc _WRITE_PORT_UCHAR ,2
cPublicFpo 2, 0

        mov     edx,[esp+4]             ; (dx) = Port       edx=000001f6
        mov     al,[esp+8]              ; (al) = Value       eax=800000e0
        out     dx,al
        stdRET    _WRITE_PORT_UCHAR

stdENDP _WRITE_PORT_UCHAR

0: kd> p
eax=800000e0 ebx=804f4d68 ecx=000000e0 edx=000001f6 esi=895e98a8 edi=89529734
eip=804f4d70 esp=f78d5eec ebp=f78d5f0c iopl=0         nv up ei ng nz na po nc
cs=0008 ss=0010 ds=0023 es=0023 fs=0030 gs=0000             efl=00000282
hal!WRITE_PORT_UCHAR+0x8:
804f4d70 ee              out     dx,al

第三部分：

        IdePortOutPortByte (
                           baseIoAddress1->BlockNumber,
                           (UCHAR) ((startingSector & 0x000000ff) >> 0));

cPublicProc _WRITE_PORT_UCHAR ,2
cPublicFpo 2, 0

        mov     edx,[esp+4]             ; (dx) = Port       edx=000001f3
        mov     al,[esp+8]              ; (al) = Value       eax=8000003f
        out     dx,al
        stdRET    _WRITE_PORT_UCHAR

stdENDP _WRITE_PORT_UCHAR

0: kd> p
eax=8000003f ebx=804f4d68 ecx=000000e0 edx=000001f3 esi=895e98a8 edi=89529734
eip=804f4d70 esp=f78d5eec ebp=f78d5f0c iopl=0         nv up ei ng nz na po nc
cs=0008 ss=0010 ds=0023 es=0023 fs=0030 gs=0000             efl=00000282
hal!WRITE_PORT_UCHAR+0x8:
804f4d70 ee              out     dx,al

第四部分：

        IdePortOutPortByte (
                           baseIoAddress1->CylinderLow,
                           (UCHAR) ((startingSector & 0x0000ff00) >> 8));

cPublicProc _WRITE_PORT_UCHAR ,2
cPublicFpo 2, 0

        mov     edx,[esp+4]             ; (dx) = Port       edx=000001f4
        mov     al,[esp+8]              ; (al) = Value       eax=00006000
        out     dx,al
        stdRET    _WRITE_PORT_UCHAR

stdENDP _WRITE_PORT_UCHAR

0: kd> p
eax=00006000 ebx=804f4d68 ecx=000000e0 edx=000001f4 esi=895e98a8 edi=89529734
eip=804f4d70 esp=f78d5eec ebp=f78d5f0c iopl=0         nv up ei pl nz na pe nc
cs=0008 ss=0010 ds=0023 es=0023 fs=0030 gs=0000             efl=00000206
hal!WRITE_PORT_UCHAR+0x8:
804f4d70 ee              out     dx,al

第五部分：

        IdePortOutPortByte (
                           baseIoAddress1->CylinderHigh,
                           (UCHAR) ((startingSector & 0x00ff0000) >> 16));

cPublicProc _WRITE_PORT_UCHAR ,2
cPublicFpo 2, 0

        mov     edx,[esp+4]             ; (dx) = Port       edx=000001f5
        mov     al,[esp+8]              ; (al) = Value       eax=00000060
        out     dx,al
        stdRET    _WRITE_PORT_UCHAR

0: kd> p
eax=00000060 ebx=804f4d68 ecx=000000e0 edx=000001f5 esi=895e98a8 edi=89529734
eip=804f4d70 esp=f78d5eec ebp=f78d5f0c iopl=0         nv up ei pl nz na pe nc
cs=0008 ss=0010 ds=0023 es=0023 fs=0030 gs=0000             efl=00000206
hal!WRITE_PORT_UCHAR+0x8:
804f4d70 ee              out     dx,al