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Re: [Qemu-devel] [PATCH] target-arm: Fixed ARMv7-M SHPR access

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH] target-arm: Fixed ARMv7-M SHPR access
Date: Sat, 17 Dec 2011 00:50:29 +0000

On 16 December 2011 18:50, Sebastian Huber
<address@hidden> wrote:
> According to "ARMv7-M Architecture Reference Manual" issue D section
> "B3.2.10 System Handler Prioriy Register 1, SHPR1", "B3.2.11 System
> Handler Prioriy Register 2, SHPR2", and "B3.2.12 System Handler Prioriy
> Register 3, SHPR3".

This would fix the specific issue of not being able to do byte or halfword
accesses to the SHPR registers, but it doesn't do anything about other
byte-accessible registers like the CFSR.

The right fix for this is for armv7m_nvic to expose a memory region for
the system control space which implements byte and halfword accesses,
and not to try to indirect everything through a single GIC region.

-- PMM

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