[PATCH 13/30] microblaze_mmu_v1: pgalloc.h and page.h

monstr
2009-04-27T09:57:19Z

From: Michal Simek <monstr@monstr.eu>

Signed-off-by: Michal Simek <monstr@monstr.eu>
---
arch/microblaze/include/asm/page.h | 169 ++++++++++++++++++++++--------
arch/microblaze/include/asm/pgalloc.h | 191 +++++++++++++++++++++++++++++++++
2 files changed, 317 insertions(+), 43 deletions(-)

diff --git a/arch/microblaze/include/asm/page.h b/arch/microblaze/include/asm/page.h
index 7238dcf..c48a360 100644
--- a/arch/microblaze/include/asm/page.h
+++ b/arch/microblaze/include/asm/page.h
@@ -1,6 +1,8 @@
/*
- * Copyright (C) 2008 Michal Simek
- * Copyright (C) 2008 PetaLogix
+ * VM ops
+ *
+ * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2008-2009 PetaLogix
* Copyright (C) 2006 Atmark Techno, Inc.
* Changes for MMU support:
* Copyright (C) 2007 Xilinx, Inc. All rights reserved.
@@ -16,13 +18,17 @@
#include <linux/pfn.h>
#include <asm/setup.h>

+#ifdef __KERNEL__
+
/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT (12)
-#define PAGE_SIZE (1UL << PAGE_SHIFT)
+# ifndef __ASSEMBLY__
+# define PAGE_SIZE (1UL << PAGE_SHIFT)
+# else
+# define PAGE_SIZE (1 << PAGE_SHIFT)
+# endif
#define PAGE_MASK (~(PAGE_SIZE-1))

-#ifdef __KERNEL__
-
#ifndef __ASSEMBLY__

#define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
@@ -35,6 +41,7 @@
/* align addr on a size boundary - adjust address up if needed */
#define _ALIGN(addr, size) _ALIGN_UP(addr, size)

+#ifndef CONFIG_MMU
/*
* 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
@@ -43,15 +50,44 @@
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)
+#else /* CONFIG_MMU */
+
+/*
+ * PAGE_OFFSET -- the first address of the first page of memory. With MMU
+ * it is set to the kernel start address (aligned on a page boundary).
+ *
+ * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
+ * in arch/microblaze/Makefile.
+ */
+#define PAGE_OFFSET CONFIG_KERNEL_START
+
+/*
+ * MAP_NR -- given an address, calculate the index of the page struct which
+ * points to the address's page.
+ */
+#define MAP_NR(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT)

-#define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
+/*
+ * The basic type of a PTE - 32 bit physical addressing.
+ */
+typedef unsigned long pte_basic_t;
+#define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */
+#define PTE_FMT "%.8lx"

+#endif /* CONFIG_MMU */

-#define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
-#define copy_user_page(vto, vfrom, vaddr, topg) \
+# ifndef CONFIG_MMU
+# 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)
+# else /* CONFIG_MMU */
+extern void copy_page(void *to, void *from);
+# endif /* CONFIG_MMU */
+
+# 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)

/*
@@ -60,21 +96,32 @@ extern unsigned int __page_offset;
typedef struct page *pgtable_t;
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pgprot; } pgprot_t;
+/* FIXME this can depend on linux kernel version */
+# ifdef CONFIG_MMU
+typedef struct { unsigned long pmd; } pmd_t;
+typedef struct { unsigned long pgd; } pgd_t;
+# else /* CONFIG_MMU */
typedef struct { unsigned long ste[64]; } pmd_t;
typedef struct { pmd_t pue[1]; } pud_t;
typedef struct { pud_t pge[1]; } pgd_t;
+# endif /* CONFIG_MMU */

+# define pte_val(x) ((x).pte)
+# define pgprot_val(x) ((x).pgprot)

-#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])
+# ifdef CONFIG_MMU
+# define pmd_val(x) ((x).pmd)
+# define pgd_val(x) ((x).pgd)
+# else /* CONFIG_MMU */
+# define pmd_val(x) ((x).ste[0])
+# define pud_val(x) ((x).pue[0])
+# define pgd_val(x) ((x).pge[0])
+# endif /* CONFIG_MMU */

-#define __pte(x) ((pte_t) { (x) })
-#define __pmd(x) ((pmd_t) { (x) })
-#define __pgd(x) ((pgd_t) { (x) })
-#define __pgprot(x) ((pgprot_t) { (x) })
+# 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
@@ -94,44 +141,80 @@ 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))
+extern unsigned int memory_start;
+extern unsigned int memory_end;
+extern unsigned int memory_size;

-#define phys_to_pfn(phys) (PFN_DOWN(phys))
-#define pfn_to_phys(pfn) (PFN_PHYS(pfn))
+extern int page_is_ram(unsigned long pfn);

-#define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr))))
-#define pfn_to_virt(pfn) __va(pfn_to_phys((pfn)))
+# define phys_to_pfn(phys) (PFN_DOWN(phys))
+# define pfn_to_phys(pfn) (PFN_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 virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr))))
+# define pfn_to_virt(pfn) __va(pfn_to_phys((pfn)))

-#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)))
+# ifdef CONFIG_MMU
+# define virt_to_page(kaddr) (mem_map + MAP_NR(kaddr))
+# else /* CONFIG_MMU */
+# 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)))
+# endif /* CONFIG_MMU */

-extern unsigned int memory_start;
-extern unsigned int memory_end;
-extern unsigned int memory_size;
+# ifndef CONFIG_MMU
+# define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) <= max_mapnr)
+# define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
+# else /* CONFIG_MMU */
+# define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT)
+# define pfn_valid(pfn) ((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
+# define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
+# endif /* CONFIG_MMU */

-#define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_mapnr)
+# endif /* __ASSEMBLY__ */

-#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
+#define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))

-#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)))
+# ifndef CONFIG_MMU
+# define __pa(vaddr) ((unsigned long) (vaddr))
+# define __va(paddr) ((void *) (paddr))
+# else /* CONFIG_MMU */
+# define __pa(x) __virt_to_phys((unsigned long)(x))
+# define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
+# endif /* CONFIG_MMU */
+

-/* Convert between virtual and physical address for MMU. */
-/* Handle MicroBlaze processor with virtual memory. */
+/* Convert between virtual and physical address for MMU. */
+/* Handle MicroBlaze processor with virtual memory. */
+#ifndef CONFIG_MMU
#define __virt_to_phys(addr) addr
#define __phys_to_virt(addr) addr
+#define tophys(rd, rs) addik rd, rs, 0
+#define tovirt(rd, rs) addik rd, rs, 0
+#else
+#define __virt_to_phys(addr) \
+ ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
+#define __phys_to_virt(addr) \
+ ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
+#define tophys(rd, rs) \
+ addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
+#define tovirt(rd, rs) \
+ addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
+#endif /* CONFIG_MMU */

#define TOPHYS(addr) __virt_to_phys(addr)

+#ifdef CONFIG_MMU
+#ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC
+#define WANT_PAGE_VIRTUAL 1 /* page alloc 2 relies on this */
+#endif
+
+#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
+ VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+#endif /* CONFIG_MMU */
+
#endif /* __KERNEL__ */

#include <asm-generic/memory_model.h>
diff --git a/arch/microblaze/include/asm/pgalloc.h b/arch/microblaze/include/asm/pgalloc.h
index 2a4b354..59a757e 100644
--- a/arch/microblaze/include/asm/pgalloc.h
+++ b/arch/microblaze/include/asm/pgalloc.h
@@ -1,4 +1,6 @@
/*
+ * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2008-2009 PetaLogix
* Copyright (C) 2006 Atmark Techno, Inc.
*
* This file is subject to the terms and conditions of the GNU General Public
@@ -9,6 +11,195 @@
#ifndef _ASM_MICROBLAZE_PGALLOC_H
#define _ASM_MICROBLAZE_PGALLOC_H

+#ifdef CONFIG_MMU
+
+#include <linux/kernel.h> /* For min/max macros */
+#include <linux/highmem.h>
+#include <asm/setup.h>
+#include <asm/io.h>
+#include <asm/page.h>
+#include <asm/cache.h>
+
+#define PGDIR_ORDER 0
+
+/*
+ * This is handled very differently on MicroBlaze since out page tables
+ * are all 0's and I want to be able to use these zero'd pages elsewhere
+ * as well - it gives us quite a speedup.
+ * -- Cort
+ */
+extern struct pgtable_cache_struct {
+ unsigned long *pgd_cache;
+ unsigned long *pte_cache;
+ unsigned long pgtable_cache_sz;
+} quicklists;
+
+#define pgd_quicklist (quicklists.pgd_cache)
+#define pmd_quicklist ((unsigned long *)0)
+#define pte_quicklist (quicklists.pte_cache)
+#define pgtable_cache_size (quicklists.pgtable_cache_sz)
+
+extern unsigned long *zero_cache; /* head linked list of pre-zero'd pages */
+extern atomic_t zero_sz; /* # currently pre-zero'd pages */
+extern atomic_t zeropage_hits; /* # zero'd pages request that we've done */
+extern atomic_t zeropage_calls; /* # zero'd pages request that've been made */
+extern atomic_t zerototal; /* # pages zero'd over time */
+
+#define zero_quicklist (zero_cache)
+#define zero_cache_sz (zero_sz)
+#define zero_cache_calls (zeropage_calls)
+#define zero_cache_hits (zeropage_hits)
+#define zero_cache_total (zerototal)
+
+/*
+ * return a pre-zero'd page from the list,
+ * return NULL if none available -- Cort
+ */
+extern unsigned long get_zero_page_fast(void);
+
+extern void __bad_pte(pmd_t *pmd);
+
+extern inline pgd_t *get_pgd_slow(void)
+{
+ pgd_t *ret;
+
+ ret = (pgd_t *)__get_free_pages(GFP_KERNEL, PGDIR_ORDER);
+ if (ret != NULL)
+ clear_page(ret);
+ return ret;
+}
+
+extern inline pgd_t *get_pgd_fast(void)
+{
+ unsigned long *ret;
+
+ ret = pgd_quicklist;
+ if (ret != NULL) {
+ pgd_quicklist = (unsigned long *)(*ret);
+ ret[0] = 0;
+ pgtable_cache_size--;
+ } else
+ ret = (unsigned long *)get_pgd_slow();
+ return (pgd_t *)ret;
+}
+
+extern inline void free_pgd_fast(pgd_t *pgd)
+{
+ *(unsigned long **)pgd = pgd_quicklist;
+ pgd_quicklist = (unsigned long *) pgd;
+ pgtable_cache_size++;
+}
+
+extern inline void free_pgd_slow(pgd_t *pgd)
+{
+ free_page((unsigned long)pgd);
+}
+
+#define pgd_free(mm, pgd) free_pgd_fast(pgd)
+#define pgd_alloc(mm) get_pgd_fast()
+
+#define pmd_pgtable(pmd) pmd_page(pmd)
+
+/*
+ * We don't have any real pmd's, and this code never triggers because
+ * the pgd will always be present..
+ */
+#define pmd_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); })
+#define pmd_alloc_one(mm, address) ({ BUG(); ((pmd_t *)2); })
+/* FIXME two definition - look below */
+#define pmd_free(mm, x) do { } while (0)
+#define pgd_populate(mm, pmd, pte) BUG()
+
+static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
+ unsigned long address)
+{
+ pte_t *pte;
+ extern int mem_init_done;
+ extern void *early_get_page(void);
+ if (mem_init_done) {
+ pte = (pte_t *)__get_free_page(GFP_KERNEL |
+ __GFP_REPEAT | __GFP_ZERO);
+ } else {
+ pte = (pte_t *)early_get_page();
+ if (pte)
+ clear_page(pte);
+ }
+ return pte;
+}
+
+static inline struct page *pte_alloc_one(struct mm_struct *mm,
+ unsigned long address)
+{
+ struct page *ptepage;
+
+#ifdef CONFIG_HIGHPTE
+ int flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_REPEAT;
+#else
+ int flags = GFP_KERNEL | __GFP_REPEAT;
+#endif
+
+ ptepage = alloc_pages(flags, 0);
+ if (ptepage)
+ clear_highpage(ptepage);
+ return ptepage;
+}
+
+static inline pte_t *pte_alloc_one_fast(struct mm_struct *mm,
+ unsigned long address)
+{
+ unsigned long *ret;
+
+ ret = pte_quicklist;
+ if (ret != NULL) {
+ pte_quicklist = (unsigned long *)(*ret);
+ ret[0] = 0;
+ pgtable_cache_size--;
+ }
+ return (pte_t *)ret;
+}
+
+extern inline void pte_free_fast(pte_t *pte)
+{
+ *(unsigned long **)pte = pte_quicklist;
+ pte_quicklist = (unsigned long *) pte;
+ pgtable_cache_size++;
+}
+
+extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
+{
+ free_page((unsigned long)pte);
+}
+
+extern inline void pte_free_slow(struct page *ptepage)
+{
+ __free_page(ptepage);
+}
+
+extern inline void pte_free(struct mm_struct *mm, struct page *ptepage)
+{
+ __free_page(ptepage);
+}
+
+#define __pte_free_tlb(tlb, pte) pte_free((tlb)->mm, (pte))
+
+#define pmd_populate(mm, pmd, pte) (pmd_val(*(pmd)) = page_address(pte))
+
+#define pmd_populate_kernel(mm, pmd, pte) \
+ (pmd_val(*(pmd)) = (unsigned long) (pte))
+
+/*
+ * We don't have any real pmd's, and this code never triggers because
+ * the pgd will always be present..
+ */
+#define pmd_alloc_one(mm, address) ({ BUG(); ((pmd_t *)2); })
+/*#define pmd_free(mm, x) do { } while (0)*/
+#define __pmd_free_tlb(tlb, x) do { } while (0)
+#define pgd_populate(mm, pmd, pte) BUG()
+
+extern int do_check_pgt_cache(int, int);
+
+#endif /* CONFIG_MMU */
+
#define check_pgt_cache() do {} while (0)

#endif /* _ASM_MICROBLAZE_PGALLOC_H */
--
1.5.5.1