1 files changed, 104 insertions, 0 deletions

diff --git a/arch/csky/include/asm/page.h b/arch/csky/include/asm/page.h
new file mode 100644
index 000000000000..73cf2bd66a13
--- /dev/null
+++ b/arch/csky/include/asm/page.h
@@ -0,0 +1,104 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_CSKY_PAGE_H
+#define __ASM_CSKY_PAGE_H
+
+#include <asm/setup.h>
+#include <asm/cache.h>
+#include <linux/const.h>
+
+/*
+ * PAGE_SHIFT determines the page size
+ */
+#define PAGE_SHIFT      12
+#define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
+#define PAGE_MASK       (~(PAGE_SIZE - 1))
+#define THREAD_SIZE     (PAGE_SIZE * 2)
+#define THREAD_MASK     (~(THREAD_SIZE - 1))
+#define THREAD_SHIFT    (PAGE_SHIFT + 1)
+
+/*
+ * NOTE: virtual isn't really correct, actually it should be the offset into the
+ * memory node, but we have no highmem, so that works for now.
+ * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
+ * of the shifts unnecessary.
+ */
+
+#ifndef __ASSEMBLY__
+
+#include <linux/pfn.h>
+
+#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
+#define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
+
+#define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && \
+                        (void *)(kaddr) < high_memory)
+#define pfn_valid(pfn)          ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
+
+extern void *memset(void *dest, int c, size_t l);
+extern void *memcpy(void *to, const void *from, size_t l);
+
+#define clear_page(page)        memset((page), 0, PAGE_SIZE)
+#define copy_page(to, from)     memcpy((to), (from), PAGE_SIZE)
+
+#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
+#define phys_to_page(paddr)     (pfn_to_page(PFN_DOWN(paddr)))
+
+struct page;
+
+#include <abi/page.h>
+
+struct vm_area_struct;
+
+/*
+ * These are used to make use of C type-checking..
+ */
+typedef struct { unsigned long pte_low; } pte_t;
+#define pte_val(x)      ((x).pte_low)
+
+typedef struct { unsigned long pgd; } pgd_t;
+typedef struct { unsigned long pgprot; } pgprot_t;
+typedef struct page *pgtable_t;
+
+#define pgd_val(x)      ((x).pgd)
+#define pgprot_val(x)   ((x).pgprot)
+
+#define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
+
+#define __pte(x)        ((pte_t) { (x) })
+#define __pgd(x)        ((pgd_t) { (x) })
+#define __pgprot(x)     ((pgprot_t) { (x) })
+
+#endif /* !__ASSEMBLY__ */
+
+#define PHYS_OFFSET             (CONFIG_RAM_BASE & ~(LOWMEM_LIMIT - 1))
+#define PHYS_OFFSET_OFFSET      (CONFIG_RAM_BASE & (LOWMEM_LIMIT - 1))
+#define ARCH_PFN_OFFSET         PFN_DOWN(CONFIG_RAM_BASE)
+
+#define PAGE_OFFSET     0x80000000
+#define LOWMEM_LIMIT    0x40000000
+
+#define __pa(x)         ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
+#define __va(x)         ((void *)((unsigned long)(x) + PAGE_OFFSET - \
+                                  PHYS_OFFSET))
+#define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))
+
+#define MAP_NR(x)       PFN_DOWN((unsigned long)(x) - PAGE_OFFSET - \
+                                 PHYS_OFFSET_OFFSET)
+#define virt_to_page(x) (mem_map + MAP_NR(x))
+
+#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
+                                VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+
+/*
+ * main RAM and kernel working space are coincident at 0x80000000, but to make
+ * life more interesting, there's also an uncached virtual shadow at 0xb0000000
+ * - these mappings are fixed in the MMU
+ */
+
+#define pfn_to_kaddr(x) __va(PFN_PHYS(x))
+
+#include <asm-generic/memory_model.h>
+#include <asm-generic/getorder.h>
+
+#endif /* __ASM_CSKY_PAGE_H */