From: Vijay Kumar <vijay.ac.kumar@oracle.com> To: davem@davemloft.net Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, babu.moger@oracle.com, rob.gardner@oracle.com, sam@ravnborg.org, anthony.yznaga@oracle.com Subject: [PATCH v4 1/5] sparc64: Define SPARC default fls function Date: Wed, 11 Oct 2017 12:50:02 -0600 [thread overview] Message-ID: <1507747806-10251-2-git-send-email-vijay.ac.kumar@oracle.com> (raw) In-Reply-To: <1507747806-10251-1-git-send-email-vijay.ac.kumar@oracle.com> fls will now require a boot time patching on T4 and above. Redefining it under arch/sparc/lib. Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com> --- arch/sparc/include/asm/bitops_64.h | 3 +- arch/sparc/lib/Makefile | 1 + arch/sparc/lib/fls.S | 67 ++++++++++++++++++++++++++++++++++++ 3 files changed, 70 insertions(+), 1 deletions(-) diff --git a/arch/sparc/include/asm/bitops_64.h b/arch/sparc/include/asm/bitops_64.h index 2d52240..30aea56 100644 --- a/arch/sparc/include/asm/bitops_64.h +++ b/arch/sparc/include/asm/bitops_64.h @@ -22,9 +22,10 @@ void clear_bit(unsigned long nr, volatile unsigned long *addr); void change_bit(unsigned long nr, volatile unsigned long *addr); +int fls(unsigned int word); + #include <asm-generic/bitops/non-atomic.h> -#include <asm-generic/bitops/fls.h> #include <asm-generic/bitops/__fls.h> #include <asm-generic/bitops/fls64.h> diff --git a/arch/sparc/lib/Makefile b/arch/sparc/lib/Makefile index a1a2d39..3b9f5e0 100644 --- a/arch/sparc/lib/Makefile +++ b/arch/sparc/lib/Makefile @@ -16,6 +16,7 @@ lib-$(CONFIG_SPARC64) += atomic_64.o lib-$(CONFIG_SPARC32) += lshrdi3.o ashldi3.o lib-$(CONFIG_SPARC32) += muldi3.o bitext.o cmpdi2.o lib-$(CONFIG_SPARC64) += multi3.o +lib-$(CONFIG_SPARC64) += fls.o lib-$(CONFIG_SPARC64) += copy_page.o clear_page.o bzero.o lib-$(CONFIG_SPARC64) += csum_copy.o csum_copy_from_user.o csum_copy_to_user.o diff --git a/arch/sparc/lib/fls.S b/arch/sparc/lib/fls.S new file mode 100644 index 0000000..06b8d30 --- /dev/null +++ b/arch/sparc/lib/fls.S @@ -0,0 +1,67 @@ +/* fls.S: SPARC default fls definition. + * + * SPARC default fls definition, which follows the same algorithm as + * in generic fls(). This function will be boot time patched on T4 + * and onward. + */ + +#include <linux/linkage.h> +#include <asm/export.h> + + .text + .register %g2, #scratch + .register %g3, #scratch +ENTRY(fls) + brz,pn %o0, 6f + mov 0, %o1 + sethi %hi(0xffff0000), %g3 + mov %o0, %g2 + andcc %o0, %g3, %g0 + be,pt %icc, 8f + mov 32, %o1 + sethi %hi(0xff000000), %g3 + andcc %g2, %g3, %g0 + bne,pt %icc, 3f + sethi %hi(0xf0000000), %g3 + sll %o0, 8, %o0 +1: + add %o1, -8, %o1 + sra %o0, 0, %o0 + mov %o0, %g2 +2: + sethi %hi(0xf0000000), %g3 +3: + andcc %g2, %g3, %g0 + bne,pt %icc, 4f + sethi %hi(0xc0000000), %g3 + sll %o0, 4, %o0 + add %o1, -4, %o1 + sra %o0, 0, %o0 + mov %o0, %g2 +4: + andcc %g2, %g3, %g0 + be,a,pt %icc, 7f + sll %o0, 2, %o0 +5: + xnor %g0, %o0, %o0 + srl %o0, 31, %o0 + sub %o1, %o0, %o1 +6: + jmp %o7 + 8 + sra %o1, 0, %o0 +7: + add %o1, -2, %o1 + ba,pt %xcc, 5b + sra %o0, 0, %o0 +8: + sll %o0, 16, %o0 + sethi %hi(0xff000000), %g3 + sra %o0, 0, %o0 + mov %o0, %g2 + andcc %g2, %g3, %g0 + bne,pt %icc, 2b + mov 16, %o1 + ba,pt %xcc, 1b + sll %o0, 8, %o0 +ENDPROC(fls) +EXPORT_SYMBOL(fls) -- 1.7.1
WARNING: multiple messages have this Message-ID (diff)
From: Vijay Kumar <vijay.ac.kumar@oracle.com> To: davem@davemloft.net Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, babu.moger@oracle.com, rob.gardner@oracle.com, sam@ravnborg.org, anthony.yznaga@oracle.com Subject: [PATCH v4 1/5] sparc64: Define SPARC default fls function Date: Wed, 11 Oct 2017 18:50:02 +0000 [thread overview] Message-ID: <1507747806-10251-2-git-send-email-vijay.ac.kumar@oracle.com> (raw) In-Reply-To: <1507747806-10251-1-git-send-email-vijay.ac.kumar@oracle.com> fls will now require a boot time patching on T4 and above. Redefining it under arch/sparc/lib. Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com> --- arch/sparc/include/asm/bitops_64.h | 3 +- arch/sparc/lib/Makefile | 1 + arch/sparc/lib/fls.S | 67 ++++++++++++++++++++++++++++++++++++ 3 files changed, 70 insertions(+), 1 deletions(-) diff --git a/arch/sparc/include/asm/bitops_64.h b/arch/sparc/include/asm/bitops_64.h index 2d52240..30aea56 100644 --- a/arch/sparc/include/asm/bitops_64.h +++ b/arch/sparc/include/asm/bitops_64.h @@ -22,9 +22,10 @@ void clear_bit(unsigned long nr, volatile unsigned long *addr); void change_bit(unsigned long nr, volatile unsigned long *addr); +int fls(unsigned int word); + #include <asm-generic/bitops/non-atomic.h> -#include <asm-generic/bitops/fls.h> #include <asm-generic/bitops/__fls.h> #include <asm-generic/bitops/fls64.h> diff --git a/arch/sparc/lib/Makefile b/arch/sparc/lib/Makefile index a1a2d39..3b9f5e0 100644 --- a/arch/sparc/lib/Makefile +++ b/arch/sparc/lib/Makefile @@ -16,6 +16,7 @@ lib-$(CONFIG_SPARC64) += atomic_64.o lib-$(CONFIG_SPARC32) += lshrdi3.o ashldi3.o lib-$(CONFIG_SPARC32) += muldi3.o bitext.o cmpdi2.o lib-$(CONFIG_SPARC64) += multi3.o +lib-$(CONFIG_SPARC64) += fls.o lib-$(CONFIG_SPARC64) += copy_page.o clear_page.o bzero.o lib-$(CONFIG_SPARC64) += csum_copy.o csum_copy_from_user.o csum_copy_to_user.o diff --git a/arch/sparc/lib/fls.S b/arch/sparc/lib/fls.S new file mode 100644 index 0000000..06b8d30 --- /dev/null +++ b/arch/sparc/lib/fls.S @@ -0,0 +1,67 @@ +/* fls.S: SPARC default fls definition. + * + * SPARC default fls definition, which follows the same algorithm as + * in generic fls(). This function will be boot time patched on T4 + * and onward. + */ + +#include <linux/linkage.h> +#include <asm/export.h> + + .text + .register %g2, #scratch + .register %g3, #scratch +ENTRY(fls) + brz,pn %o0, 6f + mov 0, %o1 + sethi %hi(0xffff0000), %g3 + mov %o0, %g2 + andcc %o0, %g3, %g0 + be,pt %icc, 8f + mov 32, %o1 + sethi %hi(0xff000000), %g3 + andcc %g2, %g3, %g0 + bne,pt %icc, 3f + sethi %hi(0xf0000000), %g3 + sll %o0, 8, %o0 +1: + add %o1, -8, %o1 + sra %o0, 0, %o0 + mov %o0, %g2 +2: + sethi %hi(0xf0000000), %g3 +3: + andcc %g2, %g3, %g0 + bne,pt %icc, 4f + sethi %hi(0xc0000000), %g3 + sll %o0, 4, %o0 + add %o1, -4, %o1 + sra %o0, 0, %o0 + mov %o0, %g2 +4: + andcc %g2, %g3, %g0 + be,a,pt %icc, 7f + sll %o0, 2, %o0 +5: + xnor %g0, %o0, %o0 + srl %o0, 31, %o0 + sub %o1, %o0, %o1 +6: + jmp %o7 + 8 + sra %o1, 0, %o0 +7: + add %o1, -2, %o1 + ba,pt %xcc, 5b + sra %o0, 0, %o0 +8: + sll %o0, 16, %o0 + sethi %hi(0xff000000), %g3 + sra %o0, 0, %o0 + mov %o0, %g2 + andcc %g2, %g3, %g0 + bne,pt %icc, 2b + mov 16, %o1 + ba,pt %xcc, 1b + sll %o0, 8, %o0 +ENDPROC(fls) +EXPORT_SYMBOL(fls) -- 1.7.1
next prev parent reply other threads:[~2017-10-11 18:51 UTC|newest] Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-10-11 18:50 [PATCH v4 0/5] sparc64: Optimize fls and __fls Vijay Kumar 2017-10-11 18:50 ` Vijay Kumar 2017-10-11 18:50 ` Vijay Kumar [this message] 2017-10-11 18:50 ` [PATCH v4 1/5] sparc64: Define SPARC default fls function Vijay Kumar 2017-10-11 18:50 ` [PATCH v4 2/5] sparc64: Define SPARC default __fls function Vijay Kumar 2017-10-11 18:50 ` Vijay Kumar 2017-10-11 18:50 ` [PATCH v4 3/5] sparc64: SPARC optimized fls function Vijay Kumar 2017-10-11 18:50 ` Vijay Kumar 2017-10-11 18:50 ` [PATCH v4 4/5] sparc64: SPARC optimized __fls function Vijay Kumar 2017-10-11 18:50 ` Vijay Kumar 2017-10-11 18:50 ` [PATCH v4 5/5] sparc64: Use sparc optimized fls and __fls for T4 and above Vijay Kumar 2017-10-11 18:50 ` Vijay Kumar 2017-10-12 20:29 ` [PATCH v4 0/5] sparc64: Optimize fls and __fls Babu Moger 2017-10-12 20:29 ` Babu Moger 2017-11-15 5:27 ` David Miller 2017-11-15 5:27 ` David Miller
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=1507747806-10251-2-git-send-email-vijay.ac.kumar@oracle.com \ --to=vijay.ac.kumar@oracle.com \ --cc=anthony.yznaga@oracle.com \ --cc=babu.moger@oracle.com \ --cc=davem@davemloft.net \ --cc=linux-kernel@vger.kernel.org \ --cc=rob.gardner@oracle.com \ --cc=sam@ravnborg.org \ --cc=sparclinux@vger.kernel.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.