[PATCH 1/2] ARM: add memory types for the TCMs

[Catalin Marinas]

On Wed, 2010-09-29 at 16:42 +0100, Russell King - ARM Linux wrote:
> On Thu, Jul 08, 2010 at 11:16:45PM +0200, Linus Walleij wrote:
> > I'm especially in the dark about the usage of the L_PTE_* stuff,
> > and when to use DOMAIN_KERNEL, DOMAIN_USER and DOMAIN_IO. For
> > example: does DOMAIN_KERNEL imply kernel usage? DOMAIN_KERNEL
> > for ITCM makes the code non-executable. Does DOMAIN_USER imply
> > that L_PTE_USER shall also be set?
> 
> Sorry, should've replied to this much earlier.  We now have a problem in
> that this stuff for the ITCM entry is wrong (identified via Santosh's
> MT_MEMORY problems).
> 
> L_PTE_* define what ends up in the PTE entries.  L_PTE_USER and
> L_PTE_WRITE operate together:
> 
> - None set, page is read-only in SVC mode, inaccessible in user mode.
> - L_PTE_WRITE, page is read-write in SVC mode, inaccessible in user mode.
> - L_PTE_USER, page is read-write in SVC mode, read-only in user mode.

Just a small addition - with the domains removal patch on ARMv7, this
becomes read-only for both SVC and user modes.

-- 
Catalin