diff options
| author | Chris Zankel <chris@zankel.net> | 2007-08-22 10:14:51 -0700 |
|---|---|---|
| committer | Chris Zankel <chris@zankel.net> | 2007-08-27 13:54:16 -0700 |
| commit | 6656920b0b50beacb6cb64cf55273cbb686e436e (patch) | |
| tree | dab9fdb81821b455a29779de6ca3306dbdf05dbd /arch/xtensa/mm/fault.c | |
| parent | ff6fd469885aafa5ec387babcb6537f3c00d6df0 (diff) | |
[XTENSA] Add support for cache-aliasing
Add support for processors that have cache-aliasing issues, such as
the Stretch S5000 processor. Cache-aliasing means that the size of
the cache (for one way) is larger than the page size, thus, a page
can end up in several places in cache depending on the virtual to
physical translation. The method used here is to map a user page
temporarily through the auto-refill way 0 and of of the DTLB.
We probably will want to revisit this issue and use a better
approach with kmap/kunmap.
Signed-off-by: Chris Zankel <chris@zankel.net>
Diffstat (limited to 'arch/xtensa/mm/fault.c')
| -rw-r--r-- | arch/xtensa/mm/fault.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/xtensa/mm/fault.c b/arch/xtensa/mm/fault.c index 16004067add..45d28f217c0 100644 --- a/arch/xtensa/mm/fault.c +++ b/arch/xtensa/mm/fault.c @@ -24,6 +24,8 @@ unsigned long asid_cache = ASID_USER_FIRST; void bad_page_fault(struct pt_regs*, unsigned long, int); +#undef DEBUG_PAGE_FAULT + /* * This routine handles page faults. It determines the address, * and the problem, and then passes it off to one of the appropriate @@ -64,7 +66,7 @@ void do_page_fault(struct pt_regs *regs) exccause == EXCCAUSE_ITLB_MISS || exccause == EXCCAUSE_FETCH_CACHE_ATTRIBUTE) ? 1 : 0; -#if 0 +#ifdef DEBUG_PAGE_FAULT printk("[%s:%d:%08x:%d:%08x:%s%s]\n", current->comm, current->pid, address, exccause, regs->pc, is_write? "w":"", is_exec? "x":""); #endif @@ -219,7 +221,7 @@ bad_page_fault(struct pt_regs *regs, unsigned long address, int sig) /* Are we prepared to handle this kernel fault? */ if ((entry = search_exception_tables(regs->pc)) != NULL) { -#if 1 +#ifdef DEBUG_PAGE_FAULT printk(KERN_DEBUG "%s: Exception at pc=%#010lx (%lx)\n", current->comm, regs->pc, entry->fixup); #endif |