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target: MMU-aware init for memory read/write

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Start switching MMU handling over to a more sensible scheme.
Having an mmu() method enables MMU-aware behaviors.  Not having
one kicks in simpler ones, with no distinction between virtual
and physical addresses.

Currently only a handful of targets have methods to read/write
physical memory:  just arm720, arm920, and arm926.  They should
all initialize OK now, but the arm*20 parts don't do the "extra"
stuff arm926 does (which should arguably be target-generic).

Also simplify how target_init() loops over all targets by making
it be a normal "for" loop, instead of scattering its three parts
to the four winds.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
This commit is contained in:
David Brownell
2009-11-10 11:58:31 -08:00
parent 6881c1b6d6
commit 61af6a6816
2 changed files with 51 additions and 28 deletions
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14
doc/openocd.texi
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@@ -5051,9 +5051,11 @@ about what TAP is the current target, or about MMU configuration.
Display contents of address @var{addr}, as
32-bit words (@command{mdw}), 16-bit halfwords (@command{mdh}),
or 8-bit bytes (@command{mdb}).
When the current target has an MMU which is present and active,
@var{addr} is interpreted as a virtual address.
Otherwise, or if the optional @var{phys} flag is specified,
@var{addr} is interpreted as a physical address.
If @var{count} is specified, displays that many units.
@var{phys} is an optional flag to indicate to use
physical address and bypass MMU
(If you want to manipulate the data instead of displaying it,
see the @code{mem2array} primitives.)
@end deffn
@@ -5062,10 +5064,12 @@ see the @code{mem2array} primitives.)
@deffnx Command mwh [phys] addr halfword
@deffnx Command mwb [phys] addr byte
Writes the specified @var{word} (32 bits),
@var{halfword} (16 bits), or @var{byte} (8-bit) pattern,
@var{halfword} (16 bits), or @var{byte} (8-bit) value,
at the specified address @var{addr}.
@var{phys} is an optional flag to indicate to use
physical address and bypass MMU
When the current target has an MMU which is present and active,
@var{addr} is interpreted as a virtual address.
Otherwise, or if the optional @var{phys} flag is specified,
@var{addr} is interpreted as a physical address.
@end deffn