From 2ee2ff875a4d3bdb941e2bb1173cd927c09d5a67 Mon Sep 17 00:00:00 2001 From: Michal Simek Date: Thu, 10 Dec 2009 11:43:57 +0100 Subject: microblaze: Support for WB cache Microblaze version 7.20.d is the first MB version which can be run on MMU linux. Please do not used previous version because they contain HW bug. Based on WB support was necessary to redesign whole cache design. Microblaze versions from 7.20.a don't need to disable IRQ and cache before working with them that's why there are special structures for it. Signed-off-by: Michal Simek --- arch/microblaze/kernel/signal.c | 30 ++++++++++++++++++++++++++++-- 1 file changed, 28 insertions(+), 2 deletions(-) (limited to 'arch/microblaze/kernel/signal.c') diff --git a/arch/microblaze/kernel/signal.c b/arch/microblaze/kernel/signal.c index 0c96ac34c316..6de3db04b1a4 100644 --- a/arch/microblaze/kernel/signal.c +++ b/arch/microblaze/kernel/signal.c @@ -176,6 +176,11 @@ static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, struct rt_sigframe __user *frame; int err = 0; int signal; + unsigned long address = 0; +#ifdef CONFIG_MMU + pmd_t *pmdp; + pte_t *ptep; +#endif frame = get_sigframe(ka, regs, sizeof(*frame)); @@ -216,8 +221,29 @@ static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, Negative 8 offset because return is rtsd r15, 8 */ regs->r15 = ((unsigned long)frame->tramp)-8; - __invalidate_cache_sigtramp((unsigned long)frame->tramp); - + address = ((unsigned long)frame->tramp); +#ifdef CONFIG_MMU + pmdp = pmd_offset(pud_offset( + pgd_offset(current->mm, address), + address), address); + + preempt_disable(); + ptep = pte_offset_map(pmdp, address); + if (pte_present(*ptep)) { + address = (unsigned long) page_address(pte_page(*ptep)); + /* MS: I need add offset in page */ + address += ((unsigned long)frame->tramp) & ~PAGE_MASK; + /* MS address is virtual */ + address = virt_to_phys(address); + invalidate_icache_range(address, address + 8); + flush_dcache_range(address, address + 8); + } + pte_unmap(ptep); + preempt_enable(); +#else + flush_icache_range(address, address + 8); + flush_dcache_range(address, address + 8); +#endif if (err) goto give_sigsegv; -- cgit v1.2.3