Newbie: allocating aligned physically-contiguous memory?

My apologies for the dumb Linux question; I usually live in the comp.arch.fpga world.

I'm using a custom architecture (2.4.26 kernel on PPC 405 inside an XC2VP30 FPGA) that can work with a framebuffer aligned on any multiple of 0x00200000.

Here's what I need to do:
1. Allocate block of 0x00200000 physically contiguous bytes from memory.
2. Guarantee the block is aligned on a physical 0x00200000 boundary.
3. Make the block visible from user space, if possible.

It would be nice to just kmalloc(0x00200000,GFP_USER), but that wouldn't give me any way to enforce the physical alignment requirement. I'm sure someone here has done this kind of thing a million times. Any ideas? Anything I should be reading up on?
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