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| author | Max Filippov <jcmvbkbc@gmail.com> | 2018-08-12 06:01:40 -0700 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2018-08-13 20:08:19 -0700 |
| commit | 7bb516ca5424e12b42124fab2906b6da9c81ba9c (patch) | |
| tree | 275dd23356eba62a81025221e23df3210a87a7be /arch/xtensa/include/asm/initialize_mmu.h | |
| parent | fec3259c9f747c039f90e99570540114c8d81a14 (diff) | |
| download | blackbird-op-linux-7bb516ca5424e12b42124fab2906b6da9c81ba9c.tar.gz blackbird-op-linux-7bb516ca5424e12b42124fab2906b6da9c81ba9c.zip | |
xtensa: rework noMMU cache attributes initialization
Marking default memory region as cached is not always sufficient and is
not flexible. Allow specifying cache attributes for the whole memory
address space with new config entry MEMMAP_CACHEATTR. Apply it after
cache initialization.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/include/asm/initialize_mmu.h')
| -rw-r--r-- | arch/xtensa/include/asm/initialize_mmu.h | 42 |
1 files changed, 21 insertions, 21 deletions
diff --git a/arch/xtensa/include/asm/initialize_mmu.h b/arch/xtensa/include/asm/initialize_mmu.h index 42410f253597..10e9852b2fb4 100644 --- a/arch/xtensa/include/asm/initialize_mmu.h +++ b/arch/xtensa/include/asm/initialize_mmu.h @@ -177,36 +177,36 @@ #endif /* defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY */ -#if !defined(CONFIG_MMU) && XCHAL_HAVE_TLBS && \ - (XCHAL_DCACHE_SIZE || XCHAL_ICACHE_SIZE) - /* Enable data and instruction cache in the DEFAULT_MEMORY region - * if the processor has DTLB and ITLB. - */ + .endm + + .macro initialize_cacheattr - movi a5, PLATFORM_DEFAULT_MEM_START | XCHAL_SPANNING_WAY +#if !defined(CONFIG_MMU) && XCHAL_HAVE_TLBS +#if CONFIG_MEMMAP_CACHEATTR == 0x22222222 && XCHAL_HAVE_PTP_MMU +#error Default MEMMAP_CACHEATTR of 0x22222222 does not work with full MMU. +#endif + + movi a5, XCHAL_SPANNING_WAY movi a6, ~_PAGE_ATTRIB_MASK - movi a7, CA_WRITEBACK + movi a4, CONFIG_MEMMAP_CACHEATTR movi a8, 0x20000000 - movi a9, PLATFORM_DEFAULT_MEM_SIZE - j 2f 1: - sub a9, a9, a8 -2: -#if XCHAL_DCACHE_SIZE rdtlb1 a3, a5 + xor a3, a3, a4 and a3, a3, a6 - or a3, a3, a7 + xor a3, a3, a4 wdtlb a3, a5 -#endif -#if XCHAL_ICACHE_SIZE - ritlb1 a4, a5 - and a4, a4, a6 - or a4, a4, a7 - witlb a4, a5 -#endif + ritlb1 a3, a5 + xor a3, a3, a4 + and a3, a3, a6 + xor a3, a3, a4 + witlb a3, a5 + add a5, a5, a8 - bltu a8, a9, 1b + srli a4, a4, 4 + bgeu a5, a8, 1b + isync #endif .endm |
