On Wed, Oct 21, 2009 at 06:38:02PM +0000, Marcel Moolenaar wrote: > Author: marcel > Date: Wed Oct 21 18:38:02 2009 > New Revision: 198341 > URL: http://svn.freebsd.org/changeset/base/198341 > > Log: > o Introduce vm_sync_icache() for making the I-cache coherent with > the memory or D-cache, depending on the semantics of the platform. > vm_sync_icache() is basically a wrapper around pmap_sync_icache(), > that translates the vm_map_t argumument to pmap_t. > o Introduce pmap_sync_icache() to all PMAP implementation. For powerpc > it replaces the pmap_page_executable() function, added to solve > the I-cache problem in uiomove_fromphys(). > o In proc_rwmem() call vm_sync_icache() when writing to a page that > has execute permissions. This assures that when breakpoints are > written, the I-cache will be coherent and the process will actually > hit the breakpoint. > o This also fixes the Book-E PMAP implementation that was missing > necessary locking while trying to deal with the I-cache coherency > in pmap_enter() (read: mmu_booke_enter_locked). > > The key property of this change is that the I-cache is made coherent > *after* writes have been done. Doing it in the PMAP layer when adding > or changing a mapping means that the I-cache is made coherent *before* > any writes happen. The difference is key when the I-cache prefetches. >
Do you have a simple test case demonstrating the need for I-cache synchronisation? Marius _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
