Author: kib Date: Sun Aug 23 19:43:47 2020 New Revision: 364513 URL: https://svnweb.freebsd.org/changeset/base/364513
Log: kern_sharedpage.c: Add exec_sysvec_init_secondary() helper. It allows a sysent to share existing usermode data in shared page with other sysent, assuming ABI differences are not in the layout of the page. Tested by: pho Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D25273 Modified: head/sys/kern/kern_sharedpage.c head/sys/sys/sysent.h Modified: head/sys/kern/kern_sharedpage.c ============================================================================== --- head/sys/kern/kern_sharedpage.c Sun Aug 23 19:42:48 2020 (r364512) +++ head/sys/kern/kern_sharedpage.c Sun Aug 23 19:43:47 2020 (r364513) @@ -288,3 +288,21 @@ exec_sysvec_init(void *param) #endif } } + +void +exec_sysvec_init_secondary(struct sysentvec *sv, struct sysentvec *sv2) +{ + MPASS((sv2->sv_flags & SV_ABI_MASK) == (sv->sv_flags & SV_ABI_MASK)); + MPASS((sv2->sv_flags & SV_TIMEKEEP) == (sv->sv_flags & SV_TIMEKEEP)); + MPASS((sv2->sv_flags & SV_SHP) != 0 && (sv->sv_flags & SV_SHP) != 0); + + sv2->sv_shared_page_obj = sv->sv_shared_page_obj; + sv2->sv_sigcode_base = sv2->sv_shared_page_base + + (sv->sv_sigcode_base - sv->sv_shared_page_base); + if ((sv2->sv_flags & SV_ABI_MASK) != SV_ABI_FREEBSD) + return; + if ((sv2->sv_flags & SV_TIMEKEEP) != 0) { + sv2->sv_timekeep_base = sv2->sv_shared_page_base + + (sv->sv_timekeep_base - sv->sv_shared_page_base); + } +} Modified: head/sys/sys/sysent.h ============================================================================== --- head/sys/sys/sysent.h Sun Aug 23 19:42:48 2020 (r364512) +++ head/sys/sys/sysent.h Sun Aug 23 19:43:47 2020 (r364513) @@ -321,6 +321,7 @@ int shared_page_alloc(int size, int align); int shared_page_fill(int size, int align, const void *data); void shared_page_write(int base, int size, const void *data); void exec_sysvec_init(void *param); +void exec_sysvec_init_secondary(struct sysentvec *sv, struct sysentvec *sv2); void exec_inittk(void); #define INIT_SYSENTVEC(name, sv) \ _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "[email protected]"
