Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 182 insertions, 0 deletions

diff --git a/include/asm-parisc/cacheflush.h b/include/asm-parisc/cacheflush.h
new file mode 100644
index 000000000000..06732719d927
--- /dev/null
+++ b/include/asm-parisc/cacheflush.h
@@ -0,0 +1,182 @@
+#ifndef _PARISC_CACHEFLUSH_H
+#define _PARISC_CACHEFLUSH_H
+
+#include <linux/config.h>
+#include <linux/mm.h>
+
+/* The usual comment is "Caches aren't brain-dead on the <architecture>".
+ * Unfortunately, that doesn't apply to PA-RISC. */
+
+/* Cache flush operations */
+
+#ifdef CONFIG_SMP
+#define flush_cache_mm(mm) flush_cache_all()
+#else
+#define flush_cache_mm(mm) flush_cache_all_local()
+#endif
+
+#define flush_kernel_dcache_range(start,size) \
+	flush_kernel_dcache_range_asm((start), (start)+(size));
+
+extern void flush_cache_all_local(void);
+
+static inline void cacheflush_h_tmp_function(void *dummy)
+{
+	flush_cache_all_local();
+}
+
+static inline void flush_cache_all(void)
+{
+	on_each_cpu(cacheflush_h_tmp_function, NULL, 1, 1);
+}
+
+#define flush_cache_vmap(start, end)		flush_cache_all()
+#define flush_cache_vunmap(start, end)		flush_cache_all()
+
+extern int parisc_cache_flush_threshold;
+void parisc_setup_cache_timing(void);
+
+static inline void
+flush_user_dcache_range(unsigned long start, unsigned long end)
+{
+	if ((end - start) < parisc_cache_flush_threshold)
+		flush_user_dcache_range_asm(start,end);
+	else
+		flush_data_cache();
+}
+
+static inline void
+flush_user_icache_range(unsigned long start, unsigned long end)
+{
+	if ((end - start) < parisc_cache_flush_threshold)
+		flush_user_icache_range_asm(start,end);
+	else
+		flush_instruction_cache();
+}
+
+extern void flush_dcache_page(struct page *page);
+
+#define flush_dcache_mmap_lock(mapping) \
+	write_lock_irq(&(mapping)->tree_lock)
+#define flush_dcache_mmap_unlock(mapping) \
+	write_unlock_irq(&(mapping)->tree_lock)
+
+#define flush_icache_page(vma,page)	do { flush_kernel_dcache_page(page_address(page)); flush_kernel_icache_page(page_address(page)); } while (0)
+
+#define flush_icache_range(s,e)		do { flush_kernel_dcache_range_asm(s,e); flush_kernel_icache_range_asm(s,e); } while (0)
+
+#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
+do { \
+	flush_cache_page(vma, vaddr, page_to_pfn(page)); \
+	memcpy(dst, src, len); \
+	flush_kernel_dcache_range_asm((unsigned long)dst, (unsigned long)dst + len); \
+} while (0)
+
+#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
+do { \
+	flush_cache_page(vma, vaddr, page_to_pfn(page)); \
+	memcpy(dst, src, len); \
+} while (0)
+
+static inline void flush_cache_range(struct vm_area_struct *vma,
+		unsigned long start, unsigned long end)
+{
+	int sr3;
+
+	if (!vma->vm_mm->context) {
+		BUG();
+		return;
+	}
+
+	sr3 = mfsp(3);
+	if (vma->vm_mm->context == sr3) {
+		flush_user_dcache_range(start,end);
+		flush_user_icache_range(start,end);
+	} else {
+		flush_cache_all();
+	}
+}
+
+/* Simple function to work out if we have an existing address translation
+ * for a user space vma. */
+static inline pte_t *__translation_exists(struct mm_struct *mm,
+					  unsigned long addr)
+{
+	pgd_t *pgd = pgd_offset(mm, addr);
+	pmd_t *pmd;
+	pte_t *pte;
+
+	if(pgd_none(*pgd))
+		return NULL;
+
+	pmd = pmd_offset(pgd, addr);
+	if(pmd_none(*pmd) || pmd_bad(*pmd))
+		return NULL;
+
+	pte = pte_offset_map(pmd, addr);
+
+	/* The PA flush mappings show up as pte_none, but they're
+	 * valid none the less */
+	if(pte_none(*pte) && ((pte_val(*pte) & _PAGE_FLUSH) == 0))
+		return NULL;
+	return pte;
+}
+#define	translation_exists(vma, addr)	__translation_exists((vma)->vm_mm, addr)
+
+
+/* Private function to flush a page from the cache of a non-current
+ * process.  cr25 contains the Page Directory of the current user
+ * process; we're going to hijack both it and the user space %sr3 to
+ * temporarily make the non-current process current.  We have to do
+ * this because cache flushing may cause a non-access tlb miss which
+ * the handlers have to fill in from the pgd of the non-current
+ * process. */
+static inline void
+flush_user_cache_page_non_current(struct vm_area_struct *vma,
+				  unsigned long vmaddr)
+{
+	/* save the current process space and pgd */
+	unsigned long space = mfsp(3), pgd = mfctl(25);
+
+	/* we don't mind taking interrups since they may not
+	 * do anything with user space, but we can't
+	 * be preempted here */
+	preempt_disable();
+
+	/* make us current */
+	mtctl(__pa(vma->vm_mm->pgd), 25);
+	mtsp(vma->vm_mm->context, 3);
+
+	flush_user_dcache_page(vmaddr);
+	if(vma->vm_flags & VM_EXEC)
+		flush_user_icache_page(vmaddr);
+
+	/* put the old current process back */
+	mtsp(space, 3);
+	mtctl(pgd, 25);
+	preempt_enable();
+}
+
+static inline void
+__flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr)
+{
+	if (likely(vma->vm_mm->context == mfsp(3))) {
+		flush_user_dcache_page(vmaddr);
+		if (vma->vm_flags & VM_EXEC)
+			flush_user_icache_page(vmaddr);
+	} else {
+		flush_user_cache_page_non_current(vma, vmaddr);
+	}
+}
+
+static inline void
+flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
+{
+	BUG_ON(!vma->vm_mm->context);
+
+	if(likely(translation_exists(vma, vmaddr)))
+		__flush_cache_page(vma, vmaddr);
+
+}
+#endif
+