diff options
Diffstat (limited to 'config/kernel-fpu.m4')
| -rw-r--r-- | config/kernel-fpu.m4 | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/config/kernel-fpu.m4 b/config/kernel-fpu.m4 new file mode 100644 index 000000000000..3c7933413d18 --- /dev/null +++ b/config/kernel-fpu.m4 @@ -0,0 +1,131 @@ +dnl # +dnl # Handle differences in kernel FPU code. +dnl # +dnl # Kernel +dnl # 5.0: Wrappers have been introduced to save/restore the FPU state. +dnl # This change was made to the 4.19.38 and 4.14.120 LTS kernels. +dnl # HAVE_KERNEL_FPU_INTERNAL +dnl # +dnl # 4.2: Use __kernel_fpu_{begin,end}() +dnl # HAVE_UNDERSCORE_KERNEL_FPU & KERNEL_EXPORTS_X86_FPU +dnl # +dnl # Pre-4.2: Use kernel_fpu_{begin,end}() +dnl # HAVE_KERNEL_FPU & KERNEL_EXPORTS_X86_FPU +dnl # +dnl # N.B. The header check is performed before all other checks since it +dnl # depends on HAVE_KERNEL_FPU_API_HEADER being set in confdefs.h. +dnl # +AC_DEFUN([ZFS_AC_KERNEL_FPU_HEADER], [ + AC_MSG_CHECKING([whether fpu headers are available]) + ZFS_LINUX_TRY_COMPILE([ + #include <linux/module.h> + #include <asm/fpu/api.h> + ],[ + ],[ + AC_DEFINE(HAVE_KERNEL_FPU_API_HEADER, 1, + [kernel has asm/fpu/api.h]) + AC_MSG_RESULT(asm/fpu/api.h) + ],[ + AC_MSG_RESULT(i387.h & xcr.h) + ]) +]) + +AC_DEFUN([ZFS_AC_KERNEL_SRC_FPU], [ + ZFS_LINUX_TEST_SRC([kernel_fpu], [ + #include <linux/types.h> + #ifdef HAVE_KERNEL_FPU_API_HEADER + #include <asm/fpu/api.h> + #else + #include <asm/i387.h> + #include <asm/xcr.h> + #endif + ], [ + kernel_fpu_begin(); + kernel_fpu_end(); + ], [], [$ZFS_META_LICENSE]) + + ZFS_LINUX_TEST_SRC([__kernel_fpu], [ + #include <linux/types.h> + #ifdef HAVE_KERNEL_FPU_API_HEADER + #include <asm/fpu/api.h> + #else + #include <asm/i387.h> + #include <asm/xcr.h> + #endif + ], [ + __kernel_fpu_begin(); + __kernel_fpu_end(); + ], [], [$ZFS_META_LICENSE]) + + ZFS_LINUX_TEST_SRC([fpu_internal], [ + #if defined(__x86_64) || defined(__x86_64__) || \ + defined(__i386) || defined(__i386__) + #if !defined(__x86) + #define __x86 + #endif + #endif + + #if !defined(__x86) + #error Unsupported architecture + #endif + + #include <linux/types.h> + #ifdef HAVE_KERNEL_FPU_API_HEADER + #include <asm/fpu/api.h> + #include <asm/fpu/internal.h> + #else + #include <asm/i387.h> + #include <asm/xcr.h> + #endif + + #if !defined(XSTATE_XSAVE) + #error XSTATE_XSAVE not defined + #endif + + #if !defined(XSTATE_XRESTORE) + #error XSTATE_XRESTORE not defined + #endif + ],[ + struct fpu *fpu = ¤t->thread.fpu; + union fpregs_state *st = &fpu->state; + struct fregs_state *fr __attribute__ ((unused)) = &st->fsave; + struct fxregs_state *fxr __attribute__ ((unused)) = &st->fxsave; + struct xregs_state *xr __attribute__ ((unused)) = &st->xsave; + ]) +]) + +AC_DEFUN([ZFS_AC_KERNEL_FPU], [ + dnl # + dnl # Legacy kernel + dnl # + AC_MSG_CHECKING([whether kernel fpu is available]) + ZFS_LINUX_TEST_RESULT_SYMBOL([kernel_fpu_license], + [kernel_fpu_begin], [arch/x86/kernel/fpu/core.c], [ + AC_MSG_RESULT(kernel_fpu_*) + AC_DEFINE(HAVE_KERNEL_FPU, 1, + [kernel has kernel_fpu_* functions]) + AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1, + [kernel exports FPU functions]) + ],[ + dnl # + dnl # Linux 4.2 kernel + dnl # + ZFS_LINUX_TEST_RESULT_SYMBOL([__kernel_fpu_license], + [__kernel_fpu_begin], + [arch/x86/kernel/fpu/core.c arch/x86/kernel/i387.c], [ + AC_MSG_RESULT(__kernel_fpu_*) + AC_DEFINE(HAVE_UNDERSCORE_KERNEL_FPU, 1, + [kernel has __kernel_fpu_* functions]) + AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1, + [kernel exports FPU functions]) + ],[ + ZFS_LINUX_TEST_RESULT([fpu_internal], [ + AC_MSG_RESULT(internal) + AC_DEFINE(HAVE_KERNEL_FPU_INTERNAL, 1, + [kernel fpu internal]) + ],[ + AC_MSG_RESULT(unavailable) + ]) + ]) + ]) +]) |