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access_process_vm device memory infrastructure

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In order to be able to debug things like the X server and programs using
the PPC Cell SPUs, the debugger needs to be able to access device memory
through ptrace and /proc/pid/mem.

This patch:

Add the generic_access_phys access function and put the hooks in place
to allow access_process_vm to access device or PPC Cell SPU memory.

[riel@redhat.com: Add documentation for the vm_ops->access function]
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Benjamin Herrensmidt <benh@kernel.crashing.org>
Cc: Dave Airlie <airlied@linux.ie>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rik van Riel
2008-07-23 21:27:05 -07:00
committed by Linus Torvalds
parent 0d71d10a42
commit 28b2ee20c7
8 changed files with 144 additions and 18 deletions
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8
arch/x86/mm/ioremap.c
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@@ -330,6 +330,14 @@ static void __iomem *ioremap_default(resource_size_t phys_addr,
return (void __iomem *)ret;
}
void __iomem *ioremap_prot(resource_size_t phys_addr, unsigned long size,
unsigned long prot_val)
{
return __ioremap_caller(phys_addr, size, (prot_val & _PAGE_CACHE_MASK),
__builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_prot);
/**
* iounmap - Free a IO remapping
* @addr: virtual address from ioremap_*