* Copyright (C) 1999 Niibe Yutaka
*/
-/*
- [ P0/U0 (virtual) ] 0x00000000 <------ User space
- [ P1 (fixed) cached ] 0x80000000 <------ Kernel space
- [ P2 (fixed) non-cachable] 0xA0000000 <------ Physical access
- [ P3 (virtual) cached] 0xC0000000 <------ vmalloced area
- [ P4 control ] 0xE0000000
- */
-
-#ifdef __KERNEL__
+#include <linux/const.h>
/* PAGE_SHIFT determines the page size */
#if defined(CONFIG_PAGE_SIZE_4KB)
# error "Bogus kernel page size?"
#endif
-#ifdef __ASSEMBLY__
-#define PAGE_SIZE (1 << PAGE_SHIFT)
-#else
-#define PAGE_SIZE (1UL << PAGE_SHIFT)
-#endif
-
+#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#define PTE_MASK PAGE_MASK
+/* to align the pointer to the (next) page boundary */
+#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
+
#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
#define HPAGE_SHIFT 16
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
extern void copy_page(void *to, void *from);
#if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
- (defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB))
+ (defined(CONFIG_CPU_SH5) || defined(CONFIG_CPU_SH4) || \
+ defined(CONFIG_SH7705_CACHE_32KB))
struct page;
struct vm_area_struct;
extern void clear_user_page(void *to, unsigned long address, struct page *page);
-#ifdef CONFIG_CPU_SH4
+extern void copy_user_page(void *to, void *from, unsigned long address,
+ struct page *page);
+#if defined(CONFIG_CPU_SH4)
extern void copy_user_highpage(struct page *to, struct page *from,
unsigned long vaddr, struct vm_area_struct *vma);
#define __HAVE_ARCH_COPY_USER_HIGHPAGE
#define __pgd(x) ((pgd_t) { (x) } )
#define __pgprot(x) ((pgprot_t) { (x) } )
-#endif /* !__ASSEMBLY__ */
+typedef struct page *pgtable_t;
-/* to align the pointer to the (next) page boundary */
-#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
+#endif /* !__ASSEMBLY__ */
/*
- * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
- *
- * arch/sh/kernel/vmlinux.lds.S
- *
- * which has the same constant encoded..
+ * __MEMORY_START and SIZE are the physical addresses and size of RAM.
*/
-
#define __MEMORY_START CONFIG_MEMORY_START
#define __MEMORY_SIZE CONFIG_MEMORY_SIZE
+/*
+ * PAGE_OFFSET is the virtual address of the start of kernel address
+ * space.
+ */
#define PAGE_OFFSET CONFIG_PAGE_OFFSET
-#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
-#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
-#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
+/*
+ * Virtual to physical RAM address translation.
+ *
+ * In 29 bit mode, the physical offset of RAM from address 0 is visible in
+ * the kernel virtual address space, and thus we don't have to take
+ * this into account when translating. However in 32 bit mode this offset
+ * is not visible (it is part of the PMB mapping) and so needs to be
+ * added or subtracted as required.
+ */
+#ifdef CONFIG_32BIT
+#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET+__MEMORY_START)
+#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET-__MEMORY_START))
+#else
+#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
+#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
+#endif
+
+#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
-/* PFN start number, because of __MEMORY_START */
+/*
+ * PFN = physical frame number (ie PFN 0 == physical address 0)
+ * PFN_START is the PFN of the first page of RAM. By defining this we
+ * don't have struct page entries for the portion of address space
+ * between physical address 0 and the start of RAM.
+ */
#define PFN_START (__MEMORY_START >> PAGE_SHIFT)
#define ARCH_PFN_OFFSET (PFN_START)
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#endif
/*
- * Slub defaults to 8-byte alignment, we're only interested in 4.
- * Slab defaults to BYTES_PER_WORD, which ends up being the same anyways.
+ * Some drivers need to perform DMA into kmalloc'ed buffers
+ * and so we have to increase the kmalloc minalign for this.
*/
-#ifdef CONFIG_SUPERH32
-#define ARCH_KMALLOC_MINALIGN 4
-#define ARCH_SLAB_MINALIGN 4
-#else
-/* If gcc inlines memset, it will use st.q instructions. Therefore, we need
- kmalloc allocations to be 8-byte aligned. Without this, the alignment
- becomes BYTE_PER_WORD i.e. only 4 (since sizeof(long)==sizeof(void*)==4 on
- sh64 at the moment). */
-#define ARCH_KMALLOC_MINALIGN 8
+#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
+#ifdef CONFIG_SUPERH64
/*
- * We want 8-byte alignment for the slab caches as well, otherwise we have
- * the same BYTES_PER_WORD (sizeof(void *)) min align in kmem_cache_create().
+ * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
+ * happily generate {ld/st}.q pairs, requiring us to have 8-byte
+ * alignment to avoid traps. The kmalloc alignment is gauranteed by
+ * virtue of L1_CACHE_BYTES, requiring this to only be special cased
+ * for slab caches.
*/
#define ARCH_SLAB_MINALIGN 8
#endif
-#endif /* __KERNEL__ */
#endif /* __ASM_SH_PAGE_H */
projects / linux-2.6-omap-h63xx.git / blobdiff