diff options
| author | Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> | 2013-11-14 20:12:31 +0400 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2014-01-22 23:19:00 +0400 |
| commit | 75b5b5e0a262790fa11043fe45700499c7e3d818 (patch) | |
| tree | 3c5af9caa9c5478668159ff34db0ab34b51d7511 /arch/mips/include/asm/page.h | |
| parent | 601cfa7b6fb657cff9e8f77bbcce79f75dd7ab74 (diff) | |
| download | linux-75b5b5e0a262790fa11043fe45700499c7e3d818.tar.xz | |
MIPS: Add support for FTLBs
The Fixed Page Size TLB (FTLB) is a set-associative dual entry TLB. Its
purpose is to reduce the number of TLB misses by increasing the effective
TLB size and keep the implementation complexity to minimum levels.
A supported core can have both VTLB and FTLB.
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Reviewed-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/6139/
Diffstat (limited to 'arch/mips/include/asm/page.h')
| -rw-r--r-- | arch/mips/include/asm/page.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h index f6be4741f7e8..5e08bcc74897 100644 --- a/arch/mips/include/asm/page.h +++ b/arch/mips/include/asm/page.h @@ -11,6 +11,8 @@ #include <spaces.h> #include <linux/const.h> +#include <linux/kernel.h> +#include <asm/mipsregs.h> /* * PAGE_SHIFT determines the page size @@ -33,6 +35,29 @@ #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) +/* + * This is used for calculating the real page sizes + * for FTLB or VTLB + FTLB confugrations. + */ +static inline unsigned int page_size_ftlb(unsigned int mmuextdef) +{ + switch (mmuextdef) { + case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT: + if (PAGE_SIZE == (1 << 30)) + return 5; + if (PAGE_SIZE == (1llu << 32)) + return 6; + if (PAGE_SIZE > (256 << 10)) + return 7; /* reserved */ + /* fall through */ + case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT: + return (PAGE_SHIFT - 10) / 2; + default: + panic("Invalid FTLB configuration with Conf4_mmuextdef=%d value\n", + mmuextdef >> 14); + } +} + #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT #define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3) #define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT) |