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| author | Florian Fainelli <f.fainelli@gmail.com> | 2016-02-09 20:55:51 (GMT) |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2016-05-13 13:30:25 (GMT) |
| commit | 8256b17ecb028949d80c982d0f28ad46fe4e73d8 (patch) | |
| tree | 18caab2e4f081a22d5aab9dc17552c948074e1f4 /arch/mips | |
| parent | e56c7e18818dd721179f9ca95c77dd941a360384 (diff) | |
| download | linux-8256b17ecb028949d80c982d0f28ad46fe4e73d8.tar.xz | |
MIPS: Allow RIXI to be used on non-R2 or R6 cores
Some processors, like Broadcom's BMIPS4380 and BMIPS5000 support RIXI and the
"rotr" instruction, which can be used to get a slightly more efficient page
table layout.
Introduce a CONFIG_CPU_HAS_RIXI such that those cores can benefit from this
feature. Perform the conditional check updates where relevant.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Cc: john@phrozen.org
Cc: cernekee@gmail.com
Cc: jon.fraser@broadcom.com
Cc: pgynther@google.com
Cc: paul.burton@imgtec.com
Cc: ddaney.cavm@gmail.com
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12505/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/Kconfig | 5 | ||||
| -rw-r--r-- | arch/mips/include/asm/pgtable-bits.h | 8 |
2 files changed, 9 insertions, 4 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index d10ed57..5562ee5 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -1996,11 +1996,13 @@ config CPU_MIPSR1 config CPU_MIPSR2 bool default y if CPU_MIPS32_R2 || CPU_MIPS64_R2 || CPU_CAVIUM_OCTEON + select CPU_HAS_RIXI select MIPS_SPRAM config CPU_MIPSR6 bool default y if CPU_MIPS32_R6 || CPU_MIPS64_R6 + select CPU_HAS_RIXI select HAVE_ARCH_BITREVERSE select MIPS_ASID_BITS_VARIABLE select MIPS_SPRAM @@ -2421,6 +2423,9 @@ config CPU_HAS_WB config XKS01 bool +config CPU_HAS_RIXI + bool + # # Vectored interrupt mode is an R2 feature # diff --git a/arch/mips/include/asm/pgtable-bits.h b/arch/mips/include/asm/pgtable-bits.h index 58e8bf8..f88a48c 100644 --- a/arch/mips/include/asm/pgtable-bits.h +++ b/arch/mips/include/asm/pgtable-bits.h @@ -104,7 +104,7 @@ enum pgtable_bits { enum pgtable_bits { /* Used only by software (masked out before writing EntryLo*) */ _PAGE_PRESENT_SHIFT, -#if !defined(CONFIG_CPU_MIPSR2) && !defined(CONFIG_CPU_MIPSR6) +#if !defined(CONFIG_CPU_HAS_RIXI) _PAGE_NO_READ_SHIFT, #endif _PAGE_WRITE_SHIFT, @@ -115,7 +115,7 @@ enum pgtable_bits { #endif /* Used by TLB hardware (placed in EntryLo*) */ -#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) +#if defined(CONFIG_CPU_HAS_RIXI) _PAGE_NO_EXEC_SHIFT, _PAGE_NO_READ_SHIFT, #endif @@ -139,7 +139,7 @@ enum pgtable_bits { /* Used by TLB hardware (placed in EntryLo*) */ #if defined(CONFIG_XPA) # define _PAGE_NO_EXEC (1 << _PAGE_NO_EXEC_SHIFT) -#elif defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) +#elif defined(CONFIG_CPU_HAS_RIXI) # define _PAGE_NO_EXEC (cpu_has_rixi ? (1 << _PAGE_NO_EXEC_SHIFT) : 0) #endif #define _PAGE_NO_READ (1 << _PAGE_NO_READ_SHIFT) @@ -180,7 +180,7 @@ enum pgtable_bits { */ static inline uint64_t pte_to_entrylo(unsigned long pte_val) { -#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) +#ifdef CONFIG_CPU_HAS_RIXI if (cpu_has_rixi) { int sa; #ifdef CONFIG_32BIT |