Messages in this thread | | | From | "Cho, joon-woo" <> | Subject | [Q] How can I transfer data from hard disk to PCI device's memory | Date | Thu, 7 Aug 2003 14:45:37 +0900 |
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Hello.
I want to transfer data 'directly' from hard disk to some PCI device which has memory
with the helpf of kernel(file system, device driver).
In above sentence 'directly' means that data does not go through main memory of host.
So I am analyzing kernel code, but I am so confused because of memory system
complexity (page, buffer, ... ).
I find buffer head structure(struct buffer_head) has b_data pointer variable.
I think kernel transfer data from HDD to this pointer variable.
Can I map this pointer variable(b_data) to PCI device's memory?
I am very confused because this part is highly related with complex memory system
(page & buffer).
Please give me some hint. Thanks.
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