arm64: dcache: select DCACHE_WORD_ACCESS for little-endian CPUs

DCACHE_WORD_ACCESS uses the word-at-a-time API for optimised string
comparisons in the vfs layer.

This patch implements support for load_unaligned_zeropad in much the
same way as has been done for ARM, although big-endian systems are also
supported.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 295bf2d..435c9bc 100644 (file)
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -11,6 +11,7 @@ config ARM64
        select BUILDTIME_EXTABLE_SORT
        select CLONE_BACKWARDS
        select COMMON_CLK
+       select DCACHE_WORD_ACCESS
        select GENERIC_CLOCKEVENTS
        select GENERIC_IOMAP
        select GENERIC_IRQ_PROBE

diff --git a/arch/arm64/include/asm/word-at-a-time.h b/arch/arm64/include/asm/word-at-a-time.h
index 27a167d..aab5bf0 100644 (file)
--- a/arch/arm64/include/asm/word-at-a-time.h
+++ b/arch/arm64/include/asm/word-at-a-time.h
@@ -47,8 +47,48 @@ static inline unsigned long find_zero(unsigned long mask)
        return fls64(mask) >> 3;
 }
 
+#define zero_bytemask(mask) (mask)
+
 #else  /* __AARCH64EB__ */
 #include <asm-generic/word-at-a-time.h>
 #endif
 
+/*
+ * Load an unaligned word from kernel space.
+ *
+ * In the (very unlikely) case of the word being a page-crosser
+ * and the next page not being mapped, take the exception and
+ * return zeroes in the non-existing part.
+ */
+static inline unsigned long load_unaligned_zeropad(const void *addr)
+{
+       unsigned long ret, offset;
+
+       /* Load word from unaligned pointer addr */
+       asm(
+       "1:     ldr     %0, %3\n"
+       "2:\n"
+       "       .pushsection .fixup,\"ax\"\n"
+       "       .align 2\n"
+       "3:     and     %1, %2, #0x7\n"
+       "       bic     %2, %2, #0x7\n"
+       "       ldr     %0, [%2]\n"
+       "       lsl     %1, %1, #0x3\n"
+#ifndef __AARCH64EB__
+       "       lsr     %0, %0, %1\n"
+#else
+       "       lsl     %0, %0, %1\n"
+#endif
+       "       b       2b\n"
+       "       .popsection\n"
+       "       .pushsection __ex_table,\"a\"\n"
+       "       .align  3\n"
+       "       .quad   1b, 3b\n"
+       "       .popsection"
+       : "=&r" (ret), "=&r" (offset)
+       : "r" (addr), "Q" (*(unsigned long *)addr));
+
+       return ret;
+}
+
 #endif /* __ASM_WORD_AT_A_TIME_H */