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| author | Max Filippov <jcmvbkbc@gmail.com> | 2018-07-11 23:33:41 +0200 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2018-07-12 00:59:41 +0200 |
| commit | 2cc15e802b250a11ece57ea54f82993cf3430867 (patch) | |
| tree | d67e3892c92e077bebeac05db22765376e8de5c1 /arch/xtensa/include/asm/pgtable.h | |
| parent | xtensa: support DMA_ATTR_NO_KERNEL_MAPPING attribute (diff) | |
| download | linux-2cc15e802b250a11ece57ea54f82993cf3430867.tar.xz linux-2cc15e802b250a11ece57ea54f82993cf3430867.zip | |
xtensa: platform-specific handling of coherent memory
Memory layout is not fixed for noMMU xtensa configurations. Platforms
that need to use coherent DMA should implement platform_vaddr_* helpers
that check address type (cached/uncached) and convert addresses between
these types.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/include/asm/pgtable.h')
| -rw-r--r-- | arch/xtensa/include/asm/pgtable.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h index 38802259978f..29cfe421cf41 100644 --- a/arch/xtensa/include/asm/pgtable.h +++ b/arch/xtensa/include/asm/pgtable.h @@ -66,6 +66,7 @@ #define FIRST_USER_ADDRESS 0UL #define FIRST_USER_PGD_NR (FIRST_USER_ADDRESS >> PGDIR_SHIFT) +#ifdef CONFIG_MMU /* * Virtual memory area. We keep a distance to other memory regions to be * on the safe side. We also use this area for cache aliasing. @@ -80,6 +81,13 @@ #define TLBTEMP_SIZE ICACHE_WAY_SIZE #endif +#else + +#define VMALLOC_START __XTENSA_UL_CONST(0) +#define VMALLOC_END __XTENSA_UL_CONST(0xffffffff) + +#endif + /* * For the Xtensa architecture, the PTE layout is as follows: * |