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!
diff --git a/include/asm-alpha/cacheflush.h b/include/asm-alpha/cacheflush.h
new file mode 100644
index 0000000..3fc6ef7
--- /dev/null
+++ b/include/asm-alpha/cacheflush.h
@@ -0,0 +1,74 @@
+#ifndef _ALPHA_CACHEFLUSH_H
+#define _ALPHA_CACHEFLUSH_H
+
+#include <linux/config.h>
+#include <linux/mm.h>
+
+/* Caches aren't brain-dead on the Alpha. */
+#define flush_cache_all() do { } while (0)
+#define flush_cache_mm(mm) do { } while (0)
+#define flush_cache_range(vma, start, end) do { } while (0)
+#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
+#define flush_dcache_page(page) do { } while (0)
+#define flush_dcache_mmap_lock(mapping) do { } while (0)
+#define flush_dcache_mmap_unlock(mapping) do { } while (0)
+#define flush_cache_vmap(start, end) do { } while (0)
+#define flush_cache_vunmap(start, end) do { } while (0)
+
+/* Note that the following two definitions are _highly_ dependent
+ on the contexts in which they are used in the kernel. I personally
+ think it is criminal how loosely defined these macros are. */
+
+/* We need to flush the kernel's icache after loading modules. The
+ only other use of this macro is in load_aout_interp which is not
+ used on Alpha.
+
+ Note that this definition should *not* be used for userspace
+ icache flushing. While functional, it is _way_ overkill. The
+ icache is tagged with ASNs and it suffices to allocate a new ASN
+ for the process. */
+#ifndef CONFIG_SMP
+#define flush_icache_range(start, end) imb()
+#else
+#define flush_icache_range(start, end) smp_imb()
+extern void smp_imb(void);
+#endif
+
+/* We need to flush the userspace icache after setting breakpoints in
+ ptrace.
+
+ Instead of indiscriminately using imb, take advantage of the fact
+ that icache entries are tagged with the ASN and load a new mm context. */
+/* ??? Ought to use this in arch/alpha/kernel/signal.c too. */
+
+#ifndef CONFIG_SMP
+extern void __load_new_mm_context(struct mm_struct *);
+static inline void
+flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
+ unsigned long addr, int len)
+{
+ if (vma->vm_flags & VM_EXEC) {
+ struct mm_struct *mm = vma->vm_mm;
+ if (current->active_mm == mm)
+ __load_new_mm_context(mm);
+ else
+ mm->context[smp_processor_id()] = 0;
+ }
+}
+#else
+extern void flush_icache_user_range(struct vm_area_struct *vma,
+ struct page *page, unsigned long addr, int len);
+#endif
+
+/* This is used only in do_no_page and do_swap_page. */
+#define flush_icache_page(vma, page) \
+ flush_icache_user_range((vma), (page), 0, 0)
+
+#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
+do { memcpy(dst, src, len); \
+ flush_icache_user_range(vma, page, vaddr, len); \
+} while (0)
+#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
+ memcpy(dst, src, len)
+
+#endif /* _ALPHA_CACHEFLUSH_H */