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.

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/arm/mv/mv_machdep.c b/sys/arm/mv/mv_machdep.c
index 2dc20ce..c348e24 100644
--- a/sys/arm/mv/mv_machdep.c
+++ b/sys/arm/mv/mv_machdep.c
@@ -408,7 +408,7 @@ initarm(void *mdp, void *unused __unused)
 		availmem_regions_sz = i;
 	} else {
 		/* Fall back to hardcoded boothowto flags and metadata. */
-		boothowto = RB_VERBOSE | RB_SINGLE;
+		boothowto = 0; // RB_VERBOSE | RB_SINGLE;
 		lastaddr = fake_preload_metadata();
 
 		/*