From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/m68k/include/asm/pgtable_mm.h | 182 +++++++++++++++++++++++++++++++++++++
 1 file changed, 182 insertions(+)
 create mode 100644 arch/m68k/include/asm/pgtable_mm.h

(limited to 'arch/m68k/include/asm/pgtable_mm.h')

diff --git a/arch/m68k/include/asm/pgtable_mm.h b/arch/m68k/include/asm/pgtable_mm.h
new file mode 100644
index 000000000..35ed4a998
--- /dev/null
+++ b/arch/m68k/include/asm/pgtable_mm.h
@@ -0,0 +1,182 @@
+#ifndef _M68K_PGTABLE_H
+#define _M68K_PGTABLE_H
+
+#include <asm-generic/4level-fixup.h>
+
+#include <asm/setup.h>
+
+#ifndef __ASSEMBLY__
+#include <asm/processor.h>
+#include <linux/sched.h>
+#include <linux/threads.h>
+
+/*
+ * This file contains the functions and defines necessary to modify and use
+ * the m68k page table tree.
+ */
+
+#include <asm/virtconvert.h>
+
+/* Certain architectures need to do special things when pte's
+ * within a page table are directly modified.  Thus, the following
+ * hook is made available.
+ */
+#define set_pte(pteptr, pteval)					\
+	do{							\
+		*(pteptr) = (pteval);				\
+	} while(0)
+#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
+
+/* PMD_SHIFT determines the size of the area a second-level page table can map */
+#ifdef CONFIG_SUN3
+#define PMD_SHIFT       17
+#else
+#define PMD_SHIFT	22
+#endif
+#define PMD_SIZE	(1UL << PMD_SHIFT)
+#define PMD_MASK	(~(PMD_SIZE-1))
+
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+#ifdef CONFIG_SUN3
+#define PGDIR_SHIFT     17
+#elif defined(CONFIG_COLDFIRE)
+#define PGDIR_SHIFT     22
+#else
+#define PGDIR_SHIFT	25
+#endif
+#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
+#define PGDIR_MASK	(~(PGDIR_SIZE-1))
+
+/*
+ * entries per page directory level: the m68k is configured as three-level,
+ * so we do have PMD level physically.
+ */
+#ifdef CONFIG_SUN3
+#define PTRS_PER_PTE   16
+#define __PAGETABLE_PMD_FOLDED
+#define PTRS_PER_PMD   1
+#define PTRS_PER_PGD   2048
+#elif defined(CONFIG_COLDFIRE)
+#define PTRS_PER_PTE	512
+#define __PAGETABLE_PMD_FOLDED
+#define PTRS_PER_PMD	1
+#define PTRS_PER_PGD	1024
+#else
+#define PTRS_PER_PTE	1024
+#define PTRS_PER_PMD	8
+#define PTRS_PER_PGD	128
+#endif
+#define USER_PTRS_PER_PGD	(TASK_SIZE/PGDIR_SIZE)
+#define FIRST_USER_ADDRESS	0UL
+
+/* Virtual address region for use by kernel_map() */
+#ifdef CONFIG_SUN3
+#define KMAP_START     0x0DC00000
+#define KMAP_END       0x0E000000
+#elif defined(CONFIG_COLDFIRE)
+#define KMAP_START	0xe0000000
+#define KMAP_END	0xf0000000
+#else
+#define	KMAP_START	0xd0000000
+#define	KMAP_END	0xf0000000
+#endif
+
+#ifdef CONFIG_SUN3
+extern unsigned long m68k_vmalloc_end;
+#define VMALLOC_START 0x0f800000
+#define VMALLOC_END m68k_vmalloc_end
+#elif defined(CONFIG_COLDFIRE)
+#define VMALLOC_START	0xd0000000
+#define VMALLOC_END	0xe0000000
+#else
+/* Just any arbitrary offset to the start of the vmalloc VM area: the
+ * current 8MB value just means that there will be a 8MB "hole" after the
+ * physical memory until the kernel virtual memory starts.  That means that
+ * any out-of-bounds memory accesses will hopefully be caught.
+ * The vmalloc() routines leaves a hole of 4kB between each vmalloced
+ * area for the same reason. ;)
+ */
+#define VMALLOC_OFFSET	(8*1024*1024)
+#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
+#define VMALLOC_END KMAP_START
+#endif
+
+/* zero page used for uninitialized stuff */
+extern void *empty_zero_page;
+
+/*
+ * ZERO_PAGE is a global shared page that is always zero: used
+ * for zero-mapped memory areas etc..
+ */
+#define ZERO_PAGE(vaddr)	(virt_to_page(empty_zero_page))
+
+/* number of bits that fit into a memory pointer */
+#define BITS_PER_PTR			(8*sizeof(unsigned long))
+
+/* to align the pointer to a pointer address */
+#define PTR_MASK			(~(sizeof(void*)-1))
+
+/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
+/* 64-bit machines, beware!  SRB. */
+#define SIZEOF_PTR_LOG2			       2
+
+extern void kernel_set_cachemode(void *addr, unsigned long size, int cmode);
+
+/*
+ * The m68k doesn't have any external MMU info: the kernel page
+ * tables contain all the necessary information.  The Sun3 does, but
+ * they are updated on demand.
+ */
+static inline void update_mmu_cache(struct vm_area_struct *vma,
+				    unsigned long address, pte_t *ptep)
+{
+}
+
+#endif /* !__ASSEMBLY__ */
+
+#define kern_addr_valid(addr)	(1)
+
+/* MMU-specific headers */
+
+#ifdef CONFIG_SUN3
+#include <asm/sun3_pgtable.h>
+#elif defined(CONFIG_COLDFIRE)
+#include <asm/mcf_pgtable.h>
+#else
+#include <asm/motorola_pgtable.h>
+#endif
+
+#ifndef __ASSEMBLY__
+/*
+ * Macro to mark a page protection value as "uncacheable".
+ */
+#ifdef CONFIG_COLDFIRE
+# define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | CF_PAGE_NOCACHE))
+#else
+#ifdef SUN3_PAGE_NOCACHE
+# define __SUN3_PAGE_NOCACHE	SUN3_PAGE_NOCACHE
+#else
+# define __SUN3_PAGE_NOCACHE	0
+#endif
+#define pgprot_noncached(prot)							\
+	(MMU_IS_SUN3								\
+	 ? (__pgprot(pgprot_val(prot) | __SUN3_PAGE_NOCACHE))			\
+	 : ((MMU_IS_851 || MMU_IS_030)						\
+	    ? (__pgprot(pgprot_val(prot) | _PAGE_NOCACHE030))			\
+	    : (MMU_IS_040 || MMU_IS_060)					\
+	    ? (__pgprot((pgprot_val(prot) & _CACHEMASK040) | _PAGE_NOCACHE_S))	\
+	    : (prot)))
+
+#endif /* CONFIG_COLDFIRE */
+#include <asm-generic/pgtable.h>
+#endif /* !__ASSEMBLY__ */
+
+/*
+ * No page table caches to initialise
+ */
+#define pgtable_cache_init()	do { } while (0)
+
+#define check_pgt_cache()	do { } while (0)
+
+#endif /* _M68K_PGTABLE_H */
-- 
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