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nvic: Implement AIRCR changes for v8M

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The Application Interrupt and Reset Control Register has some changes
for v8M:
 * new bits SYSRESETREQS, BFHFNMINS and PRIS: these all have
   real state if the security extension is implemented and otherwise
   are constant
 * the PRIGROUP field is banked between security states
 * non-secure code can be blocked from using the SYSRESET bit
   to reset the system if SYSRESETREQS is set

Implement the new state and the changes to register read and write.
For the moment we ignore the effects of the secure PRIGROUP.
We will implement the effects of PRIS and BFHFNMIS later.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 1505240046-11454-6-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2017-09-12 19:13:52 +01:00
parent 5255fcf8e4
commit 3b2e934463
4 changed files with 59 additions and 12 deletions
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3
include/hw/intc/armv7m_nvic.h
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@ -55,7 +55,8 @@ typedef struct NVICState {
* Entries in sec_vectors[] for non-banked exception numbers are unused.
*/
VecInfo sec_vectors[NVIC_INTERNAL_VECTORS];
uint32_t prigroup;
/* The PRIGROUP field in AIRCR is banked */
uint32_t prigroup[M_REG_NUM_BANKS];
/* The following fields are all cached state that can be recalculated
* from the vectors[] and sec_vectors[] arrays and the prigroup field: