80 lines
2.9 KiB
Plaintext
80 lines
2.9 KiB
Plaintext
A tip from From: Juergen Keil <jk@tools.de>
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Solaris 9 x86 will not allow DMA for ATAPI CD/DVD-ROM drives even if
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the eeprom command shows:
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atapi-dma-enabled=1
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Here is a patch to the file /platform/i86pc/kernel/drv/ata
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that allows you to use DMA again. Note that you need to be extremely careful
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when applying the patch because it may completely break your installation
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if you don't do it right.
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% adb /platform/i86pc/kernel/drv/ata
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ata_init_drive_pcidma,10?ia
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ata_init_drive_pcidma: pushl %ebp
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ata_init_drive_pcidma+1: movl %esp,%ebp
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ata_init_drive_pcidma+3: subl $4,%esp
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ata_init_drive_pcidma+6: movl +8(%ebp),%eax
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ata_init_drive_pcidma+9: cmpb $1,+0x1ad(%eax)
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ata_init_drive_pcidma+0x10: jne +0x111 <ata_init_drive_pcidma+0x121>
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ata_init_drive_pcidma+0x16: movl +0xc(%ebp),%eax
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ata_init_drive_pcidma+0x19: movl +0x204(%eax),%eax
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ata_init_drive_pcidma+0x1f: andl $1,%eax
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ata_init_drive_pcidma+0x22: je +0x1a <ata_init_drive_pcidma+0x3c>
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ata_init_drive_pcidma+0x24: movl +0xc(%ebp),%eax
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ata_init_drive_pcidma+0x27: movzwl +4(%eax),%eax
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ata_init_drive_pcidma+0x2b: sarl $8,%eax
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ata_init_drive_pcidma+0x2e: andl $0x1f,%eax
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ata_init_drive_pcidma+0x31: cmpl $5,%eax
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This is the check for a type 5 ATAPI device
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ata_init_drive_pcidma+0x34: jne +8 <ata_init_drive_pcidma+0x3c>
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ata_init_drive_pcidma+0x36:
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Here's a patch that replaces the "cmpl $5" with a "cmpl $55", so
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that all ATAPI devices will perform DMA transfers:
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# cd /platform/i86pc/kernel/drv
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# cp ata ata-orig
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# echo 'ata_init_drive_pcidma+0x31?W 7555f883' | adb -w ata
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Note that the exact position of the instruction that needs to be patched
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may vary depending on the version of Solaris you use. Be extremely careful
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when applying the patch.
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IMPORTANT NOTE FOR AMD64 Systems
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cd /platform/i86pc/kernel/drv/amd64
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cp ata ata.orig
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adb -w ata
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ata_init_drive_pcidma,17?ia
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0x50f0: pushq %rbp
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0x50f1: xorl %edx,%edx
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0x50f3: movq %rsp,%rbp
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0x50f6: subq $0x20,%rsp
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0x50fa: movq %rbx,-0x18(%rbp)
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0x50fe: movq %r12,-0x10(%rbp)
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0x5102: movq %rdi,%rbx
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0x5105: movq %r13,-0x8(%rbp)
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0x5109: movq $0x0,0x0(%rip)
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0x5114: movq %rsi,%r12
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0x5117: cmpb $0x1,0x321(%rdi)
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0x511e: je +0x12 <0x5130>
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0x5120: movq -0x18(%rbp),%rbx
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0x5124: movq -0x10(%rbp),%r12
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0x5128: movl %edx,%eax
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0x512a: movq -0x8(%rbp),%r13
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0x512e: leave
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0x512f: ret
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0x5130: testb $0x1,0x208(%rsi)
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0x5137: je +0xe <0x5145>
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0x5139: movzbl 0x9(%rsi),%eax
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0x513d: andl $0x1f,%eax
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0x5140: cmpl $0x5,%eax
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This is the check for a type 5 ATAPI device
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0x5140?W7455f883 <<< This changes the code
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0x5140: 0x7405f883 = 0x7455f883
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?i
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0x5140: cmpl $0x55,%eax
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