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atapi!IdeReadWrite函数分析下之Send read command

backend 2025/7/17 9:55:10

第一部分：

#define SRB_USES_DMA(Srb) (((ULONG_PTR)Srb->SrbExtension) & 2)

[+0x028] SrbExtension : 0x2 [Type: void *]

第二部分：

#define IDE_COMMAND_READ_DMA 0xC8

        //
        // Send read command.
        //
        if (SRB_USES_DMA(Srb)) {

            IdePortOutPortByte (
                               baseIoAddress1->Command,
                               IDE_COMMAND_READ_DMA);

#define IdePortOutPortByte(addr, data) WRITE_PORT_UCHAR(addr, data)

第三部分：

0: kd> dt HW_DEVICE_EXTENSION 0x895e98a8                   esi=895e98a8
atapi!HW_DEVICE_EXTENSION
   +0x000 CurrentSrb       : 0x89529734 _SCSI_REQUEST_BLOCK
   +0x004 BaseIoAddress1   : _IDE_REGISTERS_1
   +0x028 BaseIoAddress2   : _IDE_REGISTERS_2
   +0x034 BaseIoAddress1Length : 8
   +0x038 BaseIoAddress2Length : 1
0: kd> dx -id 0,0,899a2278 -r1 (*((atapi!_IDE_REGISTERS_1 *)0x895e98ac))
(*((atapi!_IDE_REGISTERS_1 *)0x895e98ac))                 [Type: _IDE_REGISTERS_1]
    [+0x000] RegistersBaseAddress : 0x1f0 : Unable to read memory at Address 0x1f0 [Type: unsigned char *]
    [+0x004] Data             : 0x1f0 : Unable to read memory at Address 0x1f0 [Type: unsigned short *]
    [+0x008] Error            : 0x1f1 : Unable to read memory at Address 0x1f1 [Type: unsigned char *]
    [+0x00c] BlockCount       : 0x1f2 : Unable to read memory at Address 0x1f2 [Type: unsigned char *]
    [+0x010] BlockNumber      : 0x1f3 : Unable to read memory at Address 0x1f3 [Type: unsigned char *]
    [+0x014] CylinderLow      : 0x1f4 : Unable to read memory at Address 0x1f4 [Type: unsigned char *]
    [+0x018] CylinderHigh     : 0x1f5 : Unable to read memory at Address 0x1f5 [Type: unsigned char *]
    [+0x01c] DriveSelect      : 0x1f6 : Unable to read memory at Address 0x1f6 [Type: unsigned char *]
    [+0x020] Command          : 0x1f7 : Unable to read memory at Address 0x1f7 [Type: unsigned char *]

第四部分：

0: kd> p
atapi!IdeReadWrite+0x1da:
f729cd04 68c8000000 push 0C8h
0: kd> p
atapi!IdeReadWrite+0x1df:
f729cd09 ff7624 push dword ptr [esi+24h]
0: kd> r
eax=00000060 ebx=804f4d68 ecx=000000e0 edx=000001f5 esi=895e98a8 edi=89529734

0: kd> pr
eax=00000060 ebx=804f4d68 ecx=000000e0 edx=000001f5 esi=895e98a8 edi=89529734
eip=f729cd0c esp=f78d5ef0 ebp=f78d5f0c iopl=0         nv up ei pl nz na po nc
cs=0008 ss=0010 ds=0023 es=0023 fs=0030 gs=0000             efl=00000202
atapi!IdeReadWrite+0x1e2:
f729cd0c ffd3            call    ebx {hal!WRITE_PORT_UCHAR (804f4d68)}

0: kd> dd 0x025fe000
025fe000 ???????? ???????? ???????? ????????
025fe010 ???????? ???????? ???????? ????????
025fe020 ???????? ???????? ???????? ????????
025fe030 ???????? ???????? ???????? ????????
025fe040 ???????? ???????? ???????? ????????

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