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author | Max Filippov <jcmvbkbc@gmail.com> | 2019-05-06 16:47:41 -0700 |
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committer | Max Filippov <jcmvbkbc@gmail.com> | 2019-05-07 10:36:34 -0700 |
commit | a5944195d00a359e28d6e093593609bcee37ed5e (patch) | |
tree | 387fa1be648ba716d2a4848e817a1198a8f66a9e /arch/xtensa/Kconfig | |
parent | f7c34874f04a80d6c39a32f08da2529e59602d3c (diff) | |
download | linux-stable-a5944195d00a359e28d6e093593609bcee37ed5e.tar.gz linux-stable-a5944195d00a359e28d6e093593609bcee37ed5e.tar.bz2 linux-stable-a5944195d00a359e28d6e093593609bcee37ed5e.zip |
xtensa: implement initialize_cacheattr for MPU cores
Use CONFIG_MEMMAP_CACHEATTR to initialize MPU as described in the Xtensa
LSP RM document. Coalesce adjacent regions with the same cacheattr.
Update Kconfig help text.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/Kconfig')
-rw-r--r-- | arch/xtensa/Kconfig | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index 4b9aafe766c5..f081751db229 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -256,12 +256,26 @@ config MEMMAP_CACHEATTR region: bits 0..3 -- for addresses 0x00000000..0x1fffffff, bits 4..7 -- for addresses 0x20000000..0x3fffffff, and so on. - Cache attribute values are specific for the MMU type, so e.g. - for region protection MMUs: 2 is cache bypass, 4 is WB cached, - 1 is WT cached, f is illegal. For ful MMU: bit 0 makes it executable, - bit 1 makes it writable, bits 2..3 meaning is 0: cache bypass, - 1: WB cache, 2: WT cache, 3: special (c and e are illegal, f is - reserved). + Cache attribute values are specific for the MMU type. + For region protection MMUs: + 1: WT cached, + 2: cache bypass, + 4: WB cached, + f: illegal. + For ful MMU: + bit 0: executable, + bit 1: writable, + bits 2..3: + 0: cache bypass, + 1: WB cache, + 2: WT cache, + 3: special (c and e are illegal, f is reserved). + For MPU: + 0: illegal, + 1: WB cache, + 2: WB, no-write-allocate cache, + 3: WT cache, + 4: cache bypass. config KSEG_PADDR hex "Physical address of the KSEG mapping" |