[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6

The attached patches provides part 6 of an architecture implementation for the
Tensilica Xtensa CPU series.

Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 133 insertions, 0 deletions

diff --git a/include/asm-xtensa/page.h b/include/asm-xtensa/page.h
new file mode 100644
index 00000000000..b495e5b5a94
--- /dev/null
+++ b/include/asm-xtensa/page.h
@@ -0,0 +1,133 @@
+/*
+ * linux/include/asm-xtensa/page.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version2 as
+ * published by the Free Software Foundation.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ */
+
+#ifndef _XTENSA_PAGE_H
+#define _XTENSA_PAGE_H
+
+#ifdef __KERNEL__
+
+#include <asm/processor.h>
+#include <linux/config.h>
+
+/*
+ * PAGE_SHIFT determines the page size
+ * PAGE_ALIGN(x) aligns the pointer to the (next) page boundary
+ */
+
+#define PAGE_SHIFT		XCHAL_MMU_MIN_PTE_PAGE_SIZE
+#define PAGE_SIZE		(1 << PAGE_SHIFT)
+#define PAGE_MASK		(~(PAGE_SIZE-1))
+#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE - 1) & PAGE_MASK)
+
+#define DCACHE_WAY_SIZE		(XCHAL_DCACHE_SIZE / XCHAL_DCACHE_WAYS)
+#define PAGE_OFFSET		XCHAL_KSEG_CACHED_VADDR
+
+#ifdef __ASSEMBLY__
+
+#define __pgprot(x)	(x)
+
+#else
+
+/*
+ * These are used to make use of C type-checking..
+ */
+
+typedef struct { unsigned long pte; } pte_t;		/* page table entry */
+typedef struct { unsigned long pgd; } pgd_t;		/* PGD table entry */
+typedef struct { unsigned long pgprot; } pgprot_t;
+
+#define pte_val(x)	((x).pte)
+#define pgd_val(x)	((x).pgd)
+#define pgprot_val(x)	((x).pgprot)
+
+#define __pte(x)	((pte_t) { (x) } )
+#define __pgd(x)	((pgd_t) { (x) } )
+#define __pgprot(x)	((pgprot_t) { (x) } )
+
+/*
+ * Pure 2^n version of get_order
+ */
+
+extern __inline__ int get_order(unsigned long size)
+{
+	int order;
+#ifndef XCHAL_HAVE_NSU
+	unsigned long x1, x2, x4, x8, x16;
+
+	size = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
+	x1  = size & 0xAAAAAAAA;
+	x2  = size & 0xCCCCCCCC;
+	x4  = size & 0xF0F0F0F0;
+	x8  = size & 0xFF00FF00;
+	x16 = size & 0xFFFF0000;
+	order = x2 ? 2 : 0;
+	order += (x16 != 0) * 16;
+	order += (x8 != 0) * 8;
+	order += (x4 != 0) * 4;
+	order += (x1 != 0);
+
+	return order;
+#else
+	size = (size - 1) >> PAGE_SHIFT;
+	asm ("nsau %0, %1" : "=r" (order) : "r" (size));
+	return 32 - order;
+#endif
+}
+
+
+struct page;
+extern void clear_page(void *page);
+extern void copy_page(void *to, void *from);
+
+/*
+ * If we have cache aliasing and writeback caches, we might have to do
+ * some extra work
+ */
+
+#if (DCACHE_WAY_SIZE > PAGE_SIZE)
+void clear_user_page(void *addr, unsigned long vaddr, struct page* page);
+void copy_user_page(void *to,void* from,unsigned long vaddr,struct page* page);
+#else
+# define clear_user_page(page,vaddr,pg)		clear_page(page)
+# define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
+#endif
+
+/*
+ * This handles the memory map.  We handle pages at
+ * XCHAL_KSEG_CACHED_VADDR for kernels with 32 bit address space.
+ * These macros are for conversion of kernel address, not user
+ * addresses.
+ */
+
+#define __pa(x)			((unsigned long) (x) - PAGE_OFFSET)
+#define __va(x)			((void *)((unsigned long) (x) + PAGE_OFFSET))
+#define pfn_valid(pfn)		((unsigned long)pfn < max_mapnr)
+#ifndef CONFIG_DISCONTIGMEM
+# define pfn_to_page(pfn)	(mem_map + (pfn))
+# define page_to_pfn(page)	((unsigned long)((page) - mem_map))
+#else
+# error CONFIG_DISCONTIGMEM not supported
+#endif
+
+#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
+#define page_to_virt(page)	__va(page_to_pfn(page) << PAGE_SHIFT)
+#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
+#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
+
+#define WANT_PAGE_VIRTUAL
+
+
+#endif /* __ASSEMBLY__ */
+
+#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
+				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+
+#endif /* __KERNEL__ */
+#endif /* _XTENSA_PAGE_H */