C++ (Cpp) set_top_pte Examples

Example #1

File: highmem.c Project: NoelMacwan/android_kernel_sony_msm8226

static void kmap_remove_unused_cpu(int cpu)
{
	int start_idx, idx, type;
	int need_flush = 0;

	pagefault_disable();
	type = kmap_atomic_idx();
	start_idx = type + 1 + KM_TYPE_NR * cpu;

	for (idx = start_idx; idx < KM_TYPE_NR + KM_TYPE_NR * cpu; idx++) {
		unsigned long vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
		pte_t ptep;

		ptep = get_top_pte(vaddr);
		if (ptep) {
			set_top_pte(vaddr, __pte(0));
			need_flush = 1;
		}
	}
	pagefault_enable();

	/* flush the caches and tlb if required */
	if (need_flush) {
		local_flush_tlb_all();
		flush_cache_all();
	}
}

Example #2

File: highmem.c Project: chl4651/HEAPO

void *kmap_atomic_pfn(unsigned long pfn)
{
	unsigned long vaddr;
	int idx, type;

	pagefault_disable();

	type = kmap_atomic_idx_push();
	idx = type + KM_TYPE_NR * smp_processor_id();
	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
#ifdef CONFIG_DEBUG_HIGHMEM
	BUG_ON(!pte_none(get_top_pte(vaddr)));
#endif
	set_top_pte(vaddr, pfn_pte(pfn, kmap_prot));

	return (void *)vaddr;
}

Example #3

File: highmem.c Project: chl4651/HEAPO

void *kmap_atomic(struct page *page)
{
	unsigned int idx;
	unsigned long vaddr;
	void *kmap;
	int type;

	pagefault_disable();
	//POS (Cheolhee Lee)
	if (!(PageHighMem(page) || PageNVRAM(page)))
		return page_address(page);

#ifdef CONFIG_DEBUG_HIGHMEM
	/*
	 * There is no cache coherency issue when non VIVT, so force the
	 * dedicated kmap usage for better debugging purposes in that case.
	 */
	if (!cache_is_vivt())
		kmap = NULL;
	else
#endif
		kmap = kmap_high_get(page);
	if (kmap)
		return kmap;

	type = kmap_atomic_idx_push();

	idx = type + KM_TYPE_NR * smp_processor_id();
	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
#ifdef CONFIG_DEBUG_HIGHMEM
	/*
	 * With debugging enabled, kunmap_atomic forces that entry to 0.
	 * Make sure it was indeed properly unmapped.
	 */
	BUG_ON(!pte_none(get_top_pte(vaddr)));
#endif
	/*
	 * When debugging is off, kunmap_atomic leaves the previous mapping
	 * in place, so the contained TLB flush ensures the TLB is updated
	 * with the new mapping.
	 */
	set_top_pte(vaddr, mk_pte(page, kmap_prot));

	return (void *)vaddr;
}

Example #4

File: highmem.c Project: CaptainThrowback/android_kernel_htc_pme

static void kmap_remove_unused_cpu(int cpu)
{
	int start_idx, idx, type;

	pagefault_disable();
	type = kmap_atomic_idx();
	start_idx = FIX_KMAP_BEGIN + type + 1 + KM_TYPE_NR * cpu;

	for (idx = start_idx; idx < KM_TYPE_NR + KM_TYPE_NR * cpu; idx++) {
		unsigned long vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
		pte_t ptep;

		ptep = get_top_pte(vaddr);
		if (ptep)
			set_top_pte(vaddr, __pte(0));
	}
	pagefault_enable();
}

Example #5

File: highmem.c Project: chl4651/HEAPO

void __kunmap_atomic(void *kvaddr)
{
	unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
	int idx, type;

	if (kvaddr >= (void *)FIXADDR_START) {
		type = kmap_atomic_idx();
		idx = type + KM_TYPE_NR * smp_processor_id();

		if (cache_is_vivt())
			__cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);
#ifdef CONFIG_DEBUG_HIGHMEM
		BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
		set_top_pte(vaddr, __pte(0));
#else
		(void) idx;  /* to kill a warning */
#endif
		kmap_atomic_idx_pop();
	} else if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) {
		/* this address was obtained through kmap_high_get() */
		kunmap_high(pte_page(pkmap_page_table[PKMAP_NR(vaddr)]));
	}
	pagefault_enable();
}