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MIPS: Add LLB bit and related feature for the Config 5 CP0 register

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The LLBIT (bit 4) in the Config5 CP0 register indicates the software
availability of the Load-Linked bit. This bit is only set by hardware
and it has the following meaning:

0: LLB functionality is not supported
1: LLB functionality is supported. The following feature are also
supported:

- ERETNC instruction. Similar to ERET but it does not clear the LLB
bit in the LLAddr register.
- CP0 LLAddr/LLB bit must be set
- LLbit is software accessible through the LLAddr[0]

This will be used later on to emulate R2 LL/SC instructions.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
This commit is contained in:
Markos Chandras 2014-12-02 09:46:19 +00:00
parent 28d6f93d20
commit 5aed9da128
4 changed files with 7 additions and 0 deletions
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3
arch/mips/include/asm/cpu-features.h
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@ -38,6 +38,9 @@
#ifndef cpu_has_maar
#define cpu_has_maar (cpu_data[0].options & MIPS_CPU_MAAR)
#endif
#ifndef cpu_has_rw_llb
#define cpu_has_rw_llb (cpu_data[0].options & MIPS_CPU_RW_LLB)
#endif
/*
* For the moment we don't consider R6000 and R8000 so we can assume that