microblaze_v8: page.h, segment.h, unaligned.h

Reviewed-by: Ingo Molnar <mingo@elte.hu>
Acked-by: John Linn <john.linn@xilinx.com>
Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Acked-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>

3 files changed, 205 insertions, 0 deletions

diff --git a/arch/microblaze/include/asm/page.h b/arch/microblaze/include/asm/page.h
new file mode 100644
index 000000000000..7238dcfcc517
--- /dev/null
+++ b/arch/microblaze/include/asm/page.h
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2008 Michal Simek
+ * Copyright (C) 2008 PetaLogix
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ * Changes for MMU support:
+ *    Copyright (C) 2007 Xilinx, Inc.  All rights reserved.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef _ASM_MICROBLAZE_PAGE_H
+#define _ASM_MICROBLAZE_PAGE_H
+
+#include <linux/pfn.h>
+#include <asm/setup.h>
+
+/* PAGE_SHIFT determines the page size */
+#define PAGE_SHIFT      (12)
+#define PAGE_SIZE       (1UL << PAGE_SHIFT)
+#define PAGE_MASK       (~(PAGE_SIZE-1))
+
+#ifdef __KERNEL__
+
+#ifndef __ASSEMBLY__
+
+#define PAGE_UP(addr)   (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
+#define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
+
+/* align addr on a size boundary - adjust address up/down if needed */
+#define _ALIGN_UP(addr, size)   (((addr)+((size)-1))&(~((size)-1)))
+#define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
+
+/* align addr on a size boundary - adjust address up if needed */
+#define _ALIGN(addr, size)      _ALIGN_UP(addr, size)
+
+/*
+ * PAGE_OFFSET -- the first address of the first page of memory. When not
+ * using MMU this corresponds to the first free page in physical memory (aligned
+ * on a page boundary).
+ */
+extern unsigned int __page_offset;
+#define PAGE_OFFSET __page_offset
+
+#define copy_page(to, from)                     memcpy((to), (from), PAGE_SIZE)
+#define get_user_page(vaddr)                    __get_free_page(GFP_KERNEL)
+#define free_user_page(page, addr)              free_page(addr)
+
+#define clear_page(pgaddr)                      memset((pgaddr), 0, PAGE_SIZE)
+
+
+#define clear_user_page(pgaddr, vaddr, page)    memset((pgaddr), 0, PAGE_SIZE)
+#define copy_user_page(vto, vfrom, vaddr, topg) \
+                        memcpy((vto), (vfrom), PAGE_SIZE)
+
+/*
+ * These are used to make use of C type-checking..
+ */
+typedef struct page *pgtable_t;
+typedef struct { unsigned long  pte; }          pte_t;
+typedef struct { unsigned long  pgprot; }       pgprot_t;
+typedef struct { unsigned long  ste[64]; }      pmd_t;
+typedef struct { pmd_t          pue[1]; }       pud_t;
+typedef struct { pud_t          pge[1]; }       pgd_t;
+
+
+#define pte_val(x)      ((x).pte)
+#define pgprot_val(x)   ((x).pgprot)
+#define pmd_val(x)      ((x).ste[0])
+#define pud_val(x)      ((x).pue[0])
+#define pgd_val(x)      ((x).pge[0])
+
+#define __pte(x)        ((pte_t) { (x) })
+#define __pmd(x)        ((pmd_t) { (x) })
+#define __pgd(x)        ((pgd_t) { (x) })
+#define __pgprot(x)     ((pgprot_t) { (x) })
+
+/**
+ * Conversions for virtual address, physical address, pfn, and struct
+ * page are defined in the following files.
+ *
+ * virt -+
+ *       | asm-microblaze/page.h
+ * phys -+
+ *       | linux/pfn.h
+ *  pfn -+
+ *       | asm-generic/memory_model.h
+ * page -+
+ *
+ */
+
+extern unsigned long max_low_pfn;
+extern unsigned long min_low_pfn;
+extern unsigned long max_pfn;
+
+#define __pa(vaddr)             ((unsigned long) (vaddr))
+#define __va(paddr)             ((void *) (paddr))
+
+#define phys_to_pfn(phys)       (PFN_DOWN(phys))
+#define pfn_to_phys(pfn)        (PFN_PHYS(pfn))
+
+#define virt_to_pfn(vaddr)      (phys_to_pfn((__pa(vaddr))))
+#define pfn_to_virt(pfn)        __va(pfn_to_phys((pfn)))
+
+#define virt_to_page(vaddr)     (pfn_to_page(virt_to_pfn(vaddr)))
+#define page_to_virt(page)      (pfn_to_virt(page_to_pfn(page)))
+
+#define page_to_phys(page)      (pfn_to_phys(page_to_pfn(page)))
+#define page_to_bus(page)       (page_to_phys(page))
+#define phys_to_page(paddr)     (pfn_to_page(phys_to_pfn(paddr)))
+
+extern unsigned int memory_start;
+extern unsigned int memory_end;
+extern unsigned int memory_size;
+
+#define pfn_valid(pfn)          ((pfn) >= min_low_pfn && (pfn) < max_mapnr)
+
+#define ARCH_PFN_OFFSET         (PAGE_OFFSET >> PAGE_SHIFT)
+
+#else
+#define tophys(rd, rs)  (addik rd, rs, 0)
+#define tovirt(rd, rs)  (addik rd, rs, 0)
+#endif /* __ASSEMBLY__ */
+
+#define virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))
+
+/* Convert between virtual and physical address for MMU.  */
+/* Handle MicroBlaze processor with virtual memory.  */
+#define __virt_to_phys(addr)    addr
+#define __phys_to_virt(addr)    addr
+
+#define TOPHYS(addr)  __virt_to_phys(addr)
+
+#endif /* __KERNEL__ */
+
+#include <asm-generic/memory_model.h>
+#include <asm-generic/page.h>
+
+#endif /* _ASM_MICROBLAZE_PAGE_H */
diff --git a/arch/microblaze/include/asm/segment.h b/arch/microblaze/include/asm/segment.h
new file mode 100644
index 000000000000..7f5dcc56eea1
--- /dev/null
+++ b/arch/microblaze/include/asm/segment.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2008 Michal Simek
+ * Copyright (C) 2008 PetaLogix
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef _ASM_MICROBLAZE_SEGMENT_H
+#define _ASM_MICROBLAZE_SEGMENT_H
+
+#ifndef __ASSEMBLY__
+
+typedef struct {
+        unsigned long seg;
+} mm_segment_t;
+
+/*
+ * On Microblaze the fs value is actually the top of the corresponding
+ * address space.
+ *
+ * The fs value determines whether argument validity checking should be
+ * performed or not. If get_fs() == USER_DS, checking is performed, with
+ * get_fs() == KERNEL_DS, checking is bypassed.
+ *
+ * For historical reasons, these macros are grossly misnamed.
+ *
+ * For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal.
+ */
+#  define KERNEL_DS     ((mm_segment_t){0})
+#  define USER_DS       KERNEL_DS
+
+# define get_ds()       (KERNEL_DS)
+# define get_fs()       (current_thread_info()->addr_limit)
+# define set_fs(x) \
+                do { current_thread_info()->addr_limit = (x); } while (0)
+
+# define segment_eq(a, b)               ((a).seg == (b).seg)
+
+# endif /* __ASSEMBLY__ */
+#endif /* _ASM_MICROBLAZE_SEGMENT_H */
diff --git a/arch/microblaze/include/asm/unaligned.h b/arch/microblaze/include/asm/unaligned.h
new file mode 100644
index 000000000000..9d66b640c910
--- /dev/null
+++ b/arch/microblaze/include/asm/unaligned.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2008 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef _ASM_MICROBLAZE_UNALIGNED_H
+#define _ASM_MICROBLAZE_UNALIGNED_H
+
+# ifdef __KERNEL__
+
+# include <linux/unaligned/access_ok.h>
+# include <linux/unaligned/generic.h>
+
+# define get_unaligned  __get_unaligned_be
+# define put_unaligned  __put_unaligned_be
+
+# endif /* __KERNEL__ */
+#endif /* _ASM_MICROBLAZE_UNALIGNED_H */