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MIPS: Allow RIXI to be used on non-R2 or R6 cores

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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>
This commit is contained in:
Florian Fainelli 2016-02-09 12:55:51 -08:00 committed by Ralf Baechle
parent e56c7e1881
commit 8256b17ecb
2 changed files with 9 additions and 4 deletions
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5
arch/mips/Kconfig
View file

@ -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
#

8
arch/mips/include/asm/pgtable-bits.h
View file

@ -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