diff options
Diffstat (limited to 'meta/recipes-core/glibc/glibc/0020-eglibc-Clear-cache-lines-on-ppc8xx.patch')
-rw-r--r-- | meta/recipes-core/glibc/glibc/0020-eglibc-Clear-cache-lines-on-ppc8xx.patch | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/meta/recipes-core/glibc/glibc/0020-eglibc-Clear-cache-lines-on-ppc8xx.patch b/meta/recipes-core/glibc/glibc/0020-eglibc-Clear-cache-lines-on-ppc8xx.patch deleted file mode 100644 index 985b17b583..0000000000 --- a/meta/recipes-core/glibc/glibc/0020-eglibc-Clear-cache-lines-on-ppc8xx.patch +++ /dev/null @@ -1,83 +0,0 @@ -From 8c4d7d70a84a69fe5e8d69539368aa11f8fe20aa Mon Sep 17 00:00:00 2001 -From: Khem Raj <raj.khem@gmail.com> -Date: Thu, 31 Dec 2015 15:15:09 -0800 -Subject: [PATCH 20/30] eglibc: Clear cache lines on ppc8xx - -2007-06-13 Nathan Sidwell <nathan@codesourcery.com> - Mark Shinwell <shinwell@codesourcery.com> - - * sysdeps/unix/sysv/linux/powerpc/libc-start.c - (__libc_start_main): Detect 8xx parts and clear - __cache_line_size if detected. - * sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c - (DL_PLATFORM_AUXV): Likewise. - -Upstream-Status: Pending - -Signed-off-by: Khem Raj <raj.khem@gmail.com> ---- - sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c | 14 +++++++++++++- - sysdeps/unix/sysv/linux/powerpc/libc-start.c | 16 +++++++++++++++- - 2 files changed, 28 insertions(+), 2 deletions(-) - -diff --git a/sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c b/sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c -index b04ecc4a4c..75bda97241 100644 ---- a/sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c -+++ b/sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c -@@ -24,9 +24,21 @@ int __cache_line_size attribute_hidden; - /* Scan the Aux Vector for the "Data Cache Block Size" entry. If found - verify that the static extern __cache_line_size is defined by checking - for not NULL. If it is defined then assign the cache block size -- value to __cache_line_size. */ -+ value to __cache_line_size. This is used by memset to -+ optimize setting to zero. We have to detect 8xx processors, which -+ have buggy dcbz implementations that cannot report page faults -+ correctly. That requires reading SPR, which is a privileged -+ operation. Fortunately 2.2.18 and later emulates PowerPC mfspr -+ reads from the PVR register. */ - #define DL_PLATFORM_AUXV \ - case AT_DCACHEBSIZE: \ -+ if (__LINUX_KERNEL_VERSION >= 0x020218) \ -+ { \ -+ unsigned pvr = 0; \ -+ asm ("mfspr %0, 287" : "=r" (pvr)); \ -+ if ((pvr & 0xffff0000) == 0x00500000) \ -+ break; \ -+ } \ - __cache_line_size = av->a_un.a_val; \ - break; - -diff --git a/sysdeps/unix/sysv/linux/powerpc/libc-start.c b/sysdeps/unix/sysv/linux/powerpc/libc-start.c -index 4fd5f70700..1a21e4675c 100644 ---- a/sysdeps/unix/sysv/linux/powerpc/libc-start.c -+++ b/sysdeps/unix/sysv/linux/powerpc/libc-start.c -@@ -73,11 +73,25 @@ __libc_start_main (int argc, char **argv, - - /* Initialize the __cache_line_size variable from the aux vector. For the - static case, we also need _dl_hwcap, _dl_hwcap2 and _dl_platform, so we -- can call __tcb_parse_hwcap_and_convert_at_platform (). */ -+ can call __tcb_parse_hwcap_and_convert_at_platform (). -+ -+ This is used by memset to optimize setting to zero. We have to -+ detect 8xx processors, which have buggy dcbz implementations that -+ cannot report page faults correctly. That requires reading SPR, -+ which is a privileged operation. Fortunately 2.2.18 and later -+ emulates PowerPC mfspr reads from the PVR register. */ - for (ElfW (auxv_t) * av = auxvec; av->a_type != AT_NULL; ++av) - switch (av->a_type) - { - case AT_DCACHEBSIZE: -+ if (__LINUX_KERNEL_VERSION >= 0x020218) -+ { -+ unsigned pvr = 0; -+ -+ asm ("mfspr %0, 287" : "=r" (pvr) :); -+ if ((pvr & 0xffff0000) == 0x00500000) -+ break; -+ } - __cache_line_size = av->a_un.a_val; - break; - #ifndef SHARED --- -2.20.1 - |