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  1. 19 9月, 2012 2 次提交
    • D
      ARM: virt: allow the kernel to be entered in HYP mode · 80c59daf
      由 Dave Martin 提交于 
      This patch does two things:

  * Ensure that asynchronous aborts are masked at kernel entry.
    The bootloader should be masking these anyway, but this reduces
    the damage window just in case it doesn't.

  * Enter svc mode via exception return to ensure that CPU state is
    properly serialised.  This does not matter when switching from
    an ordinary privileged mode ("PL1" modes in ARMv7-AR rev C
    parlance), but it potentially does matter when switching from a
    another privileged mode such as hyp mode.

This should allow the kernel to boot safely either from svc mode or
hyp mode, even if no support for use of the ARM Virtualization
Extensions is built into the kernel.
Signed-off-by: NDave Martin <dave.martin@linaro.org>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
      80c59daf
    • M
      ARM: opcodes: add __ERET/__MSR_ELR_HYP instruction encoding · b9a348cb
      由 Marc Zyngier 提交于 
      Enabling boot from HYP mode requires the use of some more
virt-specific instructions ("eret" and "msr elr_hyp, reg").

Add the necessary encoding to asm/opcode-virt.h.
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
      b9a348cb
  3. 16 9月, 2012 4 次提交
    • D
      ARM: 7511/1: opcodes: Opcode definitions for the Virtualization Extensions · 508514ed
      由 Dave Martin 提交于 
      For now, this patch just adds a definition for the HVC instruction.
More can be added here later, as needed.

Now that we have a real example of how to use the opcode injection
macros properly, this patch also adds a cross-reference from the
explanation in opcodes.h (since without an example, figuring out
how to use the macros is not that easy).
Signed-off-by: NDave Martin <dave.martin@linaro.org>
Acked-by: NNicolas Pitre <nico@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      508514ed
    • D
      ARM: 7510/1: opcodes: Add helpers for emitting custom opcodes · a61a41a0
      由 Dave Martin 提交于 
      This patch adds some __inst_() macros for injecting custom opcodes
in assembler (both inline and in .S files).  They should make it
easier and cleaner to get things right in little-/big-
endian/ARM/Thumb-2 kernels without a lot of #ifdefs.

This pure-preprocessor approach is preferred over the alternative
method of wedging extra assembler directives into the assembler
input using top-level asm() blocks, since there is no way to
guarantee that the compiler won't reorder those with respect to
each other or with respect to non-toplevel asm() blocks, unless
-fno-toplevel-reorder is passed (which is in itself somewhat
undesirable because it defeats some potential optimisations).

Currently <asm/unified.h> _does_ silently rely on the compiler not
reordering at the top level, but it seems better to avoid adding
extra code which depends on this if the same result can be achieved
in another way.
Signed-off-by: NDave Martin <dave.martin@linaro.org>
Acked-by: NNicolas Pitre <nico@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      a61a41a0
    • D
      ARM: 7509/1: opcodes: Make opcode byteswapping macros assembly-compatible · 0ce3de23
      由 Dave Martin 提交于 
      Most of the existing macros don't work with assembler, due to the
use of type casts and C functions from <linux/swab.h>.

This patch abstracts out those operations and provides simple
explicit versions for use in assembly code.

__opcode_is_thumb32() and __opcode_is_thumb16() are also converted
to do bitmask-based testing to avoid confusion if these are used in
assembly code (the assembler typically treats all arithmetic values
as signed).

These changes avoid the need for the compiler to pre-evaluate
constant expressions used to generate opcodes.  By ensuring that
the forms of these expressions can be evaluated directly by the
assembler, we can just stringify the expressions directly into the
asm during the preprocessing pass.  The alternative approach
(passing the evaluated expression via an inline asm "i" constraint)
gets painful because the contents of the asm and the constraints
must be kept in sync.  This makes the resulting macros awkward to
use.

Retaining the C forms of the macros allows more efficient code to
be generated when opcodes are generated programmatically at run-
time, but there is no way to embed run-time-generated opcodes in
asm() blocks.
Signed-off-by: NDave Martin <dave.martin@linaro.org>
Acked-by: NNicolas Pitre <nico@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      0ce3de23
    • D
      ARM: 7508/1: opcodes: Don't define the thumb32 byteswapping macros for BE32 · 57b9da32
      由 Dave Martin 提交于 
      The existing __mem_to_opcode_thumb32() is incorrect for BE32
platforms.  However, these don't support Thumb-2 kernels, so this
option is not so relevant for those platforms anyway.

This operation is complicated by the lack of unaligned memory
access support prior to ARMv6.

Rather than provide a "working" macro which will probably won't get
used (or worse, will get misused), this patch removes the macro for
BE32 kernels.  People manipulating Thumb opcodes prior to ARMv6
should almost certainly be splitting these operations into
halfwords anyway, using __opcode_thumb32_{first,second,compose}()
and the 16-bit opcode transformations.
Signed-off-by: NDave Martin <dave.martin@linaro.org>
Acked-by: NNicolas Pitre <nico@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      57b9da32
  5. 06 9月, 2012 1 次提交
  7. 05 9月, 2012 12 次提交
  9. 03 9月, 2012 1 次提交
  11. 31 8月, 2012 3 次提交
  13. 30 8月, 2012 2 次提交
  15. 29 8月, 2012 8 次提交
  17. 28 8月, 2012 2 次提交
  19. 25 8月, 2012 2 次提交
  21. 24 8月, 2012 3 次提交