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-rw-r--r--arch/hexagon/include/asm/fixmap.h73
-rw-r--r--arch/hexagon/include/asm/mmu.h37
-rw-r--r--arch/hexagon/include/asm/mmu_context.h100
-rw-r--r--arch/hexagon/include/asm/page.h157
-rw-r--r--arch/hexagon/include/asm/pgalloc.h146
-rw-r--r--arch/hexagon/include/asm/pgtable.h518
-rw-r--r--arch/hexagon/mm/pgalloc.c23
7 files changed, 1054 insertions, 0 deletions
diff --git a/arch/hexagon/include/asm/fixmap.h b/arch/hexagon/include/asm/fixmap.h
new file mode 100644
index 00000000000..b27f4941645
--- /dev/null
+++ b/arch/hexagon/include/asm/fixmap.h
@@ -0,0 +1,73 @@
1/*
2 * Fixmap support for Hexagon - enough to support highmem features
3 *
4 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#ifndef _ASM_FIXMAP_H
22#define _ASM_FIXMAP_H
23
24/*
25 * A lot of the fixmap info is already in mem-layout.h
26 */
27#include <asm/mem-layout.h>
28
29/*
30 * Full fixmap support involves set_fixmap() functions, but
31 * these may not be needed if all we're after is an area for
32 * highmem kernel mappings.
33 */
34#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
35#define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
36
37extern void __this_fixmap_does_not_exist(void);
38
39/**
40 * fix_to_virt -- "index to address" translation.
41 *
42 * If anyone tries to use the idx directly without translation,
43 * we catch the bug with a NULL-deference kernel oops. Illegal
44 * ranges of incoming indices are caught too.
45 */
46static inline unsigned long fix_to_virt(const unsigned int idx)
47{
48 /*
49 * This branch gets completely eliminated after inlining,
50 * except when someone tries to use fixaddr indices in an
51 * illegal way. (such as mixing up address types or using
52 * out-of-range indices).
53 *
54 * If it doesn't get removed, the linker will complain
55 * loudly with a reasonably clear error message..
56 */
57 if (idx >= __end_of_fixed_addresses)
58 __this_fixmap_does_not_exist();
59
60 return __fix_to_virt(idx);
61}
62
63static inline unsigned long virt_to_fix(const unsigned long vaddr)
64{
65 BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
66 return __virt_to_fix(vaddr);
67}
68
69#define kmap_get_fixmap_pte(vaddr) \
70 pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), \
71 (vaddr)), (vaddr)), (vaddr))
72
73#endif
diff --git a/arch/hexagon/include/asm/mmu.h b/arch/hexagon/include/asm/mmu.h
new file mode 100644
index 00000000000..30a5d8d2659
--- /dev/null
+++ b/arch/hexagon/include/asm/mmu.h
@@ -0,0 +1,37 @@
1/*
2 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA.
17 */
18
19#ifndef _ASM_MMU_H
20#define _ASM_MMU_H
21
22#include <asm/vdso.h>
23
24/*
25 * Architecture-specific state for a mm_struct.
26 * For the Hexagon Virtual Machine, it can be a copy
27 * of the pointer to the page table base.
28 */
29struct mm_context {
30 unsigned long long generation;
31 unsigned long ptbase;
32 struct hexagon_vdso *vdso;
33};
34
35typedef struct mm_context mm_context_t;
36
37#endif
diff --git a/arch/hexagon/include/asm/mmu_context.h b/arch/hexagon/include/asm/mmu_context.h
new file mode 100644
index 00000000000..b4fe5a5411b
--- /dev/null
+++ b/arch/hexagon/include/asm/mmu_context.h
@@ -0,0 +1,100 @@
1/*
2 * MM context support for the Hexagon architecture
3 *
4 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#ifndef _ASM_MMU_CONTEXT_H
22#define _ASM_MMU_CONTEXT_H
23
24#include <asm/setup.h>
25#include <asm/page.h>
26#include <asm/pgalloc.h>
27#include <asm/mem-layout.h>
28
29static inline void destroy_context(struct mm_struct *mm)
30{
31}
32
33/*
34 * VM port hides all TLB management, so "lazy TLB" isn't very
35 * meaningful. Even for ports to architectures with visble TLBs,
36 * this is almost invariably a null function.
37 */
38static inline void enter_lazy_tlb(struct mm_struct *mm,
39 struct task_struct *tsk)
40{
41}
42
43/*
44 * Architecture-specific actions, if any, for memory map deactivation.
45 */
46static inline void deactivate_mm(struct task_struct *tsk,
47 struct mm_struct *mm)
48{
49}
50
51/**
52 * init_new_context - initialize context related info for new mm_struct instance
53 * @tsk: pointer to a task struct
54 * @mm: pointer to a new mm struct
55 */
56static inline int init_new_context(struct task_struct *tsk,
57 struct mm_struct *mm)
58{
59 /* mm->context is set up by pgd_alloc */
60 return 0;
61}
62
63/*
64 * Switch active mm context
65 */
66static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
67 struct task_struct *tsk)
68{
69 int l1;
70
71 /*
72 * For virtual machine, we have to update system map if it's been
73 * touched.
74 */
75 if (next->context.generation < prev->context.generation) {
76 for (l1 = MIN_KERNEL_SEG; l1 <= max_kernel_seg; l1++)
77 next->pgd[l1] = init_mm.pgd[l1];
78
79 next->context.generation = prev->context.generation;
80 }
81
82 __vmnewmap((void *)next->context.ptbase);
83}
84
85/*
86 * Activate new memory map for task
87 */
88static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
89{
90 unsigned long flags;
91
92 local_irq_save(flags);
93 switch_mm(prev, next, current_thread_info()->task);
94 local_irq_restore(flags);
95}
96
97/* Generic hooks for arch_dup_mmap and arch_exit_mmap */
98#include <asm-generic/mm_hooks.h>
99
100#endif
diff --git a/arch/hexagon/include/asm/page.h b/arch/hexagon/include/asm/page.h
new file mode 100644
index 00000000000..edd97626c48
--- /dev/null
+++ b/arch/hexagon/include/asm/page.h
@@ -0,0 +1,157 @@
1/*
2 * Page management definitions for the Hexagon architecture
3 *
4 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#ifndef _ASM_PAGE_H
22#define _ASM_PAGE_H
23
24#include <linux/const.h>
25
26/* This is probably not the most graceful way to handle this. */
27
28#ifdef CONFIG_PAGE_SIZE_4KB
29#define PAGE_SHIFT 12
30#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_4KB
31#endif
32
33#ifdef CONFIG_PAGE_SIZE_16KB
34#define PAGE_SHIFT 14
35#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_16KB
36#endif
37
38#ifdef CONFIG_PAGE_SIZE_64KB
39#define PAGE_SHIFT 16
40#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_64KB
41#endif
42
43#ifdef CONFIG_PAGE_SIZE_256KB
44#define PAGE_SHIFT 18
45#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_256KB
46#endif
47
48#ifdef CONFIG_PAGE_SIZE_1MB
49#define PAGE_SHIFT 20
50#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_1MB
51#endif
52
53/*
54 * These should be defined in hugetlb.h, but apparently not.
55 * "Huge" for us should be 4MB or 16MB, which are both represented
56 * in L1 PTE's. Right now, it's set up for 4MB.
57 */
58#ifdef CONFIG_HUGETLB_PAGE
59#define HPAGE_SHIFT 22
60#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
61#define HPAGE_MASK (~(HPAGE_SIZE-1))
62#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
63#define HVM_HUGEPAGE_SIZE 0x5
64#endif
65
66#define PAGE_SIZE (1UL << PAGE_SHIFT)
67#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
68
69#ifdef __KERNEL__
70#ifndef __ASSEMBLY__
71
72/*
73 * This is for PFN_DOWN, which mm.h needs. Seems the right place to pull it in.
74 */
75#include <linux/pfn.h>
76
77/*
78 * We implement a two-level architecture-specific page table structure.
79 * Null intermediate page table level (pmd, pud) definitions will come from
80 * asm-generic/pagetable-nopmd.h and asm-generic/pagetable-nopud.h
81 */
82typedef struct { unsigned long pte; } pte_t;
83typedef struct { unsigned long pgd; } pgd_t;
84typedef struct { unsigned long pgprot; } pgprot_t;
85typedef struct page *pgtable_t;
86
87#define pte_val(x) ((x).pte)
88#define pgd_val(x) ((x).pgd)
89#define pgprot_val(x) ((x).pgprot)
90#define __pte(x) ((pte_t) { (x) })
91#define __pgd(x) ((pgd_t) { (x) })
92#define __pgprot(x) ((pgprot_t) { (x) })
93
94/*
95 * We need a __pa and a __va routine for kernel space.
96 * MIPS says they're only used during mem_init.
97 * also, check if we need a PHYS_OFFSET.
98 */
99#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
100#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
101
102/* The "page frame" descriptor is defined in linux/mm.h */
103struct page;
104
105/* Returns page frame descriptor for virtual address. */
106#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(__pa(kaddr)))
107
108/* Default vm area behavior is non-executable. */
109#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
110 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
111
112#define pfn_valid(pfn) ((pfn) < max_mapnr)
113#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
114
115/* Need to not use a define for linesize; may move this to another file. */
116static inline void clear_page(void *page)
117{
118 /* This can only be done on pages with L1 WB cache */
119 asm volatile(
120 " loop0(1f,%1);\n"
121 "1: { dczeroa(%0);\n"
122 " %0 = add(%0,#32); }:endloop0\n"
123 : "+r" (page)
124 : "r" (PAGE_SIZE/32)
125 : "lc0", "sa0", "memory"
126 );
127}
128
129#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
130
131/*
132 * Under assumption that kernel always "sees" user map...
133 */
134#define clear_user_page(page, vaddr, pg) clear_page(page)
135#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
136
137/*
138 * page_to_phys - convert page to physical address
139 * @page - pointer to page entry in mem_map
140 */
141#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
142
143/*
144 * For port to Hexagon Virtual Machine, MAYBE we check for attempts
145 * to reference reserved HVM space, but in any case, the VM will be
146 * protected.
147 */
148#define kern_addr_valid(addr) (1)
149
150#include <asm-generic/memory_model.h>
151/* XXX Todo: implement assembly-optimized version of getorder. */
152#include <asm-generic/getorder.h>
153
154#endif /* ifdef __ASSEMBLY__ */
155#endif /* ifdef __KERNEL__ */
156
157#endif
diff --git a/arch/hexagon/include/asm/pgalloc.h b/arch/hexagon/include/asm/pgalloc.h
new file mode 100644
index 00000000000..13443c77513
--- /dev/null
+++ b/arch/hexagon/include/asm/pgalloc.h
@@ -0,0 +1,146 @@
1/*
2 * Page table support for the Hexagon architecture
3 *
4 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#ifndef _ASM_PGALLOC_H
22#define _ASM_PGALLOC_H
23
24#include <asm/mem-layout.h>
25#include <asm/atomic.h>
26
27#define check_pgt_cache() do {} while (0)
28
29extern unsigned long long kmap_generation;
30
31/*
32 * Page table creation interface
33 */
34static inline pgd_t *pgd_alloc(struct mm_struct *mm)
35{
36 pgd_t *pgd;
37
38 pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
39
40 /*
41 * There may be better ways to do this, but to ensure
42 * that new address spaces always contain the kernel
43 * base mapping, and to ensure that the user area is
44 * initially marked invalid, initialize the new map
45 * map with a copy of the kernel's persistent map.
46 */
47
48 memcpy(pgd, swapper_pg_dir, PTRS_PER_PGD*sizeof(pgd_t *));
49 mm->context.generation = kmap_generation;
50
51 /* Physical version is what is passed to virtual machine on switch */
52 mm->context.ptbase = __pa(pgd);
53
54 return pgd;
55}
56
57static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
58{
59 free_page((unsigned long) pgd);
60}
61
62static inline struct page *pte_alloc_one(struct mm_struct *mm,
63 unsigned long address)
64{
65 struct page *pte;
66
67 pte = alloc_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
68
69 if (pte)
70 pgtable_page_ctor(pte);
71
72 return pte;
73}
74
75/* _kernel variant gets to use a different allocator */
76static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
77 unsigned long address)
78{
79 gfp_t flags = GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO;
80 return (pte_t *) __get_free_page(flags);
81}
82
83static inline void pte_free(struct mm_struct *mm, struct page *pte)
84{
85 pgtable_page_dtor(pte);
86 __free_page(pte);
87}
88
89static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
90{
91 free_page((unsigned long)pte);
92}
93
94static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
95 pgtable_t pte)
96{
97 /*
98 * Conveniently, zero in 3 LSB means indirect 4K page table.
99 * Not so convenient when you're trying to vary the page size.
100 */
101 set_pmd(pmd, __pmd(((unsigned long)page_to_pfn(pte) << PAGE_SHIFT) |
102 HEXAGON_L1_PTE_SIZE));
103}
104
105/*
106 * Other architectures seem to have ways of making all processes
107 * share the same pmd's for their kernel mappings, but the v0.3
108 * Hexagon VM spec has a "monolithic" L1 table for user and kernel
109 * segments. We track "generations" of the kernel map to minimize
110 * overhead, and update the "slave" copies of the kernel mappings
111 * as part of switch_mm. However, we still need to update the
112 * kernel map of the active thread who's calling pmd_populate_kernel...
113 */
114static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
115 pte_t *pte)
116{
117 extern spinlock_t kmap_gen_lock;
118 pmd_t *ppmd;
119 int pmdindex;
120
121 spin_lock(&kmap_gen_lock);
122 kmap_generation++;
123 mm->context.generation = kmap_generation;
124 current->active_mm->context.generation = kmap_generation;
125 spin_unlock(&kmap_gen_lock);
126
127 set_pmd(pmd, __pmd(((unsigned long)__pa(pte)) | HEXAGON_L1_PTE_SIZE));
128
129 /*
130 * Now the "slave" copy of the current thread.
131 * This is pointer arithmetic, not byte addresses!
132 */
133 pmdindex = (pgd_t *)pmd - mm->pgd;
134 ppmd = (pmd_t *)current->active_mm->pgd + pmdindex;
135 set_pmd(ppmd, __pmd(((unsigned long)__pa(pte)) | HEXAGON_L1_PTE_SIZE));
136 if (pmdindex > max_kernel_seg)
137 max_kernel_seg = pmdindex;
138}
139
140#define __pte_free_tlb(tlb, pte, addr) \
141do { \
142 pgtable_page_dtor((pte)); \
143 tlb_remove_page((tlb), (pte)); \
144} while (0)
145
146#endif
diff --git a/arch/hexagon/include/asm/pgtable.h b/arch/hexagon/include/asm/pgtable.h
new file mode 100644
index 00000000000..ca619bf225e
--- /dev/null
+++ b/arch/hexagon/include/asm/pgtable.h
@@ -0,0 +1,518 @@
1/*
2 * Page table support for the Hexagon architecture
3 *
4 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#ifndef _ASM_PGTABLE_H
22#define _ASM_PGTABLE_H
23
24/*
25 * Page table definitions for Qualcomm Hexagon processor.
26 */
27#include <linux/swap.h>
28#include <asm/page.h>
29#include <asm-generic/pgtable-nopmd.h>
30
31/* A handy thing to have if one has the RAM. Declared in head.S */
32extern unsigned long empty_zero_page;
33extern unsigned long zero_page_mask;
34
35/*
36 * The PTE model described here is that of the Hexagon Virtual Machine,
37 * which autonomously walks 2-level page tables. At a lower level, we
38 * also describe the RISCish software-loaded TLB entry structure of
39 * the underlying Hexagon processor. A kernel built to run on the
40 * virtual machine has no need to know about the underlying hardware.
41 */
42#include <asm/vm_mmu.h>
43
44/*
45 * To maximize the comfort level for the PTE manipulation macros,
46 * define the "well known" architecture-specific bits.
47 */
48#define _PAGE_READ __HVM_PTE_R
49#define _PAGE_WRITE __HVM_PTE_W
50#define _PAGE_EXECUTE __HVM_PTE_X
51#define _PAGE_USER __HVM_PTE_U
52
53/*
54 * We have a total of 4 "soft" bits available in the abstract PTE.
55 * The two mandatory software bits are Dirty and Accessed.
56 * To make nonlinear swap work according to the more recent
57 * model, we want a low order "Present" bit to indicate whether
58 * the PTE describes MMU programming or swap space.
59 */
60#define _PAGE_PRESENT (1<<0)
61#define _PAGE_DIRTY (1<<1)
62#define _PAGE_ACCESSED (1<<2)
63
64/*
65 * _PAGE_FILE is only meaningful if _PAGE_PRESENT is false, while
66 * _PAGE_DIRTY is only meaningful if _PAGE_PRESENT is true.
67 * So we can overload the bit...
68 */
69#define _PAGE_FILE _PAGE_DIRTY /* set: pagecache, unset = swap */
70
71/*
72 * For now, let's say that Valid and Present are the same thing.
73 * Alternatively, we could say that it's the "or" of R, W, and X
74 * permissions.
75 */
76#define _PAGE_VALID _PAGE_PRESENT
77
78/*
79 * We're not defining _PAGE_GLOBAL here, since there's no concept
80 * of global pages or ASIDs exposed to the Hexagon Virtual Machine,
81 * and we want to use the same page table structures and macros in
82 * the native kernel as we do in the virtual machine kernel.
83 * So we'll put up with a bit of inefficiency for now...
84 */
85
86/*
87 * Top "FOURTH" level (pgd), which for the Hexagon VM is really
88 * only the second from the bottom, pgd and pud both being collapsed.
89 * Each entry represents 4MB of virtual address space, 4K of table
90 * thus maps the full 4GB.
91 */
92#define PGDIR_SHIFT 22
93#define PTRS_PER_PGD 1024
94
95#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
96#define PGDIR_MASK (~(PGDIR_SIZE-1))
97
98#ifdef CONFIG_PAGE_SIZE_4KB
99#define PTRS_PER_PTE 1024
100#endif
101
102#ifdef CONFIG_PAGE_SIZE_16KB
103#define PTRS_PER_PTE 256
104#endif
105
106#ifdef CONFIG_PAGE_SIZE_64KB
107#define PTRS_PER_PTE 64
108#endif
109
110#ifdef CONFIG_PAGE_SIZE_256KB
111#define PTRS_PER_PTE 16
112#endif
113
114#ifdef CONFIG_PAGE_SIZE_1MB
115#define PTRS_PER_PTE 4
116#endif
117
118/* Any bigger and the PTE disappears. */
119#define pgd_ERROR(e) \
120 printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__,\
121 pgd_val(e))
122
123/*
124 * Page Protection Constants. Includes (in this variant) cache attributes.
125 */
126extern unsigned long _dflt_cache_att;
127
128#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_USER | \
129 _dflt_cache_att)
130#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \
131 _PAGE_READ | _PAGE_EXECUTE | _dflt_cache_att)
132#define PAGE_COPY PAGE_READONLY
133#define PAGE_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
134 _PAGE_READ | _PAGE_EXECUTE | _dflt_cache_att)
135#define PAGE_COPY_EXEC PAGE_EXEC
136#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | \
137 _PAGE_EXECUTE | _PAGE_WRITE | _dflt_cache_att)
138#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_READ | \
139 _PAGE_WRITE | _PAGE_EXECUTE | _dflt_cache_att)
140
141
142/*
143 * Aliases for mapping mmap() protection bits to page protections.
144 * These get used for static initialization, so using the _dflt_cache_att
145 * variable for the default cache attribute isn't workable. If the
146 * default gets changed at boot time, the boot option code has to
147 * update data structures like the protaction_map[] array.
148 */
149#define CACHEDEF (CACHE_DEFAULT << 6)
150
151/* Private (copy-on-write) page protections. */
152#define __P000 __pgprot(_PAGE_PRESENT | _PAGE_USER | CACHEDEF)
153#define __P001 __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | CACHEDEF)
154#define __P010 __P000 /* Write-only copy-on-write */
155#define __P011 __P001 /* Read/Write copy-on-write */
156#define __P100 __pgprot(_PAGE_PRESENT | _PAGE_USER | \
157 _PAGE_EXECUTE | CACHEDEF)
158#define __P101 __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_EXECUTE | \
159 _PAGE_READ | CACHEDEF)
160#define __P110 __P100 /* Write/execute copy-on-write */
161#define __P111 __P101 /* Read/Write/Execute, copy-on-write */
162
163/* Shared page protections. */
164#define __S000 __P000
165#define __S001 __P001
166#define __S010 __pgprot(_PAGE_PRESENT | _PAGE_USER | \
167 _PAGE_WRITE | CACHEDEF)
168#define __S011 __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | \
169 _PAGE_WRITE | CACHEDEF)
170#define __S100 __pgprot(_PAGE_PRESENT | _PAGE_USER | \
171 _PAGE_EXECUTE | CACHEDEF)
172#define __S101 __P101
173#define __S110 __pgprot(_PAGE_PRESENT | _PAGE_USER | \
174 _PAGE_EXECUTE | _PAGE_WRITE | CACHEDEF)
175#define __S111 __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | \
176 _PAGE_EXECUTE | _PAGE_WRITE | CACHEDEF)
177
178extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; /* located in head.S */
179
180/* Seems to be zero even in architectures where the zero page is firewalled? */
181#define FIRST_USER_ADDRESS 0
182#define pte_special(pte) 0
183#define pte_mkspecial(pte) (pte)
184
185/* HUGETLB not working currently */
186#ifdef CONFIG_HUGETLB_PAGE
187#define pte_mkhuge(pte) __pte((pte_val(pte) & ~0x3) | HVM_HUGEPAGE_SIZE)
188#endif
189
190/*
191 * For now, assume that higher-level code will do TLB/MMU invalidations
192 * and don't insert that overhead into this low-level function.
193 */
194extern void sync_icache_dcache(pte_t pte);
195
196#define pte_present_exec_user(pte) \
197 ((pte_val(pte) & (_PAGE_EXECUTE | _PAGE_USER)) == \
198 (_PAGE_EXECUTE | _PAGE_USER))
199
200static inline void set_pte(pte_t *ptep, pte_t pteval)
201{
202 /* should really be using pte_exec, if it weren't declared later. */
203 if (pte_present_exec_user(pteval))
204 sync_icache_dcache(pteval);
205
206 *ptep = pteval;
207}
208
209/*
210 * For the Hexagon Virtual Machine MMU (or its emulation), a null/invalid
211 * L1 PTE (PMD/PGD) has 7 in the least significant bits. For the L2 PTE
212 * (Linux PTE), the key is to have bits 11..9 all zero. We'd use 0x7
213 * as a universal null entry, but some of those least significant bits
214 * are interpreted by software.
215 */
216#define _NULL_PMD 0x7
217#define _NULL_PTE 0x0
218
219static inline void pmd_clear(pmd_t *pmd_entry_ptr)
220{
221 pmd_val(*pmd_entry_ptr) = _NULL_PMD;
222}
223
224/*
225 * Conveniently, a null PTE value is invalid.
226 */
227static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
228 pte_t *ptep)
229{
230 pte_val(*ptep) = _NULL_PTE;
231}
232
233#ifdef NEED_PMD_INDEX_DESPITE_BEING_2_LEVEL
234/**
235 * pmd_index - returns the index of the entry in the PMD page
236 * which would control the given virtual address
237 */
238#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
239
240#endif
241
242/**
243 * pgd_index - returns the index of the entry in the PGD page
244 * which would control the given virtual address
245 *
246 * This returns the *index* for the address in the pgd_t
247 */
248#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
249
250/*
251 * pgd_offset - find an offset in a page-table-directory
252 */
253#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
254
255/*
256 * pgd_offset_k - get kernel (init_mm) pgd entry pointer for addr
257 */
258#define pgd_offset_k(address) pgd_offset(&init_mm, address)
259
260/**
261 * pmd_none - check if pmd_entry is mapped
262 * @pmd_entry: pmd entry
263 *
264 * MIPS checks it against that "invalid pte table" thing.
265 */
266static inline int pmd_none(pmd_t pmd)
267{
268 return pmd_val(pmd) == _NULL_PMD;
269}
270
271/**
272 * pmd_present - is there a page table behind this?
273 * Essentially the inverse of pmd_none. We maybe
274 * save an inline instruction by defining it this
275 * way, instead of simply "!pmd_none".
276 */
277static inline int pmd_present(pmd_t pmd)
278{
279 return pmd_val(pmd) != (unsigned long)_NULL_PMD;
280}
281
282/**
283 * pmd_bad - check if a PMD entry is "bad". That might mean swapped out.
284 * As we have no known cause of badness, it's null, as it is for many
285 * architectures.
286 */
287static inline int pmd_bad(pmd_t pmd)
288{
289 return 0;
290}
291
292/*
293 * pmd_page - converts a PMD entry to a page pointer
294 */
295#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
296#define pmd_pgtable(pmd) pmd_page(pmd)
297
298/**
299 * pte_none - check if pte is mapped
300 * @pte: pte_t entry
301 */
302static inline int pte_none(pte_t pte)
303{
304 return pte_val(pte) == _NULL_PTE;
305};
306
307/*
308 * pte_present - check if page is present
309 */
310static inline int pte_present(pte_t pte)
311{
312 return pte_val(pte) & _PAGE_PRESENT;
313}
314
315/* mk_pte - make a PTE out of a page pointer and protection bits */
316#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
317
318/* pte_page - returns a page (frame pointer/descriptor?) based on a PTE */
319#define pte_page(x) pfn_to_page(pte_pfn(x))
320
321/* pte_mkold - mark PTE as not recently accessed */
322static inline pte_t pte_mkold(pte_t pte)
323{
324 pte_val(pte) &= ~_PAGE_ACCESSED;
325 return pte;
326}
327
328/* pte_mkyoung - mark PTE as recently accessed */
329static inline pte_t pte_mkyoung(pte_t pte)
330{
331 pte_val(pte) |= _PAGE_ACCESSED;
332 return pte;
333}
334
335/* pte_mkclean - mark page as in sync with backing store */
336static inline pte_t pte_mkclean(pte_t pte)
337{
338 pte_val(pte) &= ~_PAGE_DIRTY;
339 return pte;
340}
341
342/* pte_mkdirty - mark page as modified */
343static inline pte_t pte_mkdirty(pte_t pte)
344{
345 pte_val(pte) |= _PAGE_DIRTY;
346 return pte;
347}
348
349/* pte_young - "is PTE marked as accessed"? */
350static inline int pte_young(pte_t pte)
351{
352 return pte_val(pte) & _PAGE_ACCESSED;
353}
354
355/* pte_dirty - "is PTE dirty?" */
356static inline int pte_dirty(pte_t pte)
357{
358 return pte_val(pte) & _PAGE_DIRTY;
359}
360
361/* pte_modify - set protection bits on PTE */
362static inline pte_t pte_modify(pte_t pte, pgprot_t prot)
363{
364 pte_val(pte) &= PAGE_MASK;
365 pte_val(pte) |= pgprot_val(prot);
366 return pte;
367}
368
369/* pte_wrprotect - mark page as not writable */
370static inline pte_t pte_wrprotect(pte_t pte)
371{
372 pte_val(pte) &= ~_PAGE_WRITE;
373 return pte;
374}
375
376/* pte_mkwrite - mark page as writable */
377static inline pte_t pte_mkwrite(pte_t pte)
378{
379 pte_val(pte) |= _PAGE_WRITE;
380 return pte;
381}
382
383/* pte_mkexec - mark PTE as executable */
384static inline pte_t pte_mkexec(pte_t pte)
385{
386 pte_val(pte) |= _PAGE_EXECUTE;
387 return pte;
388}
389
390/* pte_read - "is PTE marked as readable?" */
391static inline int pte_read(pte_t pte)
392{
393 return pte_val(pte) & _PAGE_READ;
394}
395
396/* pte_write - "is PTE marked as writable?" */
397static inline int pte_write(pte_t pte)
398{
399 return pte_val(pte) & _PAGE_WRITE;
400}
401
402
403/* pte_exec - "is PTE marked as executable?" */
404static inline int pte_exec(pte_t pte)
405{
406 return pte_val(pte) & _PAGE_EXECUTE;
407}
408
409/* __pte_to_swp_entry - extract swap entry from PTE */
410#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
411
412/* __swp_entry_to_pte - extract PTE from swap entry */
413#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
414
415/* pfn_pte - convert page number and protection value to page table entry */
416#define pfn_pte(pfn, pgprot) __pte((pfn << PAGE_SHIFT) | pgprot_val(pgprot))
417
418/* pte_pfn - convert pte to page frame number */
419#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
420#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
421
422/*
423 * set_pte_at - update page table and do whatever magic may be
424 * necessary to make the underlying hardware/firmware take note.
425 *
426 * VM may require a virtual instruction to alert the MMU.
427 */
428#define set_pte_at(mm, addr, ptep, pte) set_pte(ptep, pte)
429
430/*
431 * May need to invoke the virtual machine as well...
432 */
433#define pte_unmap(pte) do { } while (0)
434#define pte_unmap_nested(pte) do { } while (0)
435
436/*
437 * pte_offset_map - returns the linear address of the page table entry
438 * corresponding to an address
439 */
440#define pte_offset_map(dir, address) \
441 ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
442
443#define pte_offset_map_nested(pmd, addr) pte_offset_map(pmd, addr)
444
445/* pte_offset_kernel - kernel version of pte_offset */
446#define pte_offset_kernel(dir, address) \
447 ((pte_t *) (unsigned long) __va(pmd_val(*dir) & PAGE_MASK) \
448 + __pte_offset(address))
449
450/* ZERO_PAGE - returns the globally shared zero page */
451#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
452
453#define __pte_offset(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
454
455/* Nothing special about IO remapping at this point */
456#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
457 remap_pfn_range(vma, vaddr, pfn, size, prot)
458
459/* I think this is in case we have page table caches; needed by init/main.c */
460#define pgtable_cache_init() do { } while (0)
461
462/*
463 * Swap/file PTE definitions. If _PAGE_PRESENT is zero, the rest of the
464 * PTE is interpreted as swap information. Depending on the _PAGE_FILE
465 * bit, the remaining free bits are eitehr interpreted as a file offset
466 * or a swap type/offset tuple. Rather than have the TLB fill handler
467 * test _PAGE_PRESENT, we're going to reserve the permissions bits
468 * and set them to all zeros for swap entries, which speeds up the
469 * miss handler at the cost of 3 bits of offset. That trade-off can
470 * be revisited if necessary, but Hexagon processor architecture and
471 * target applications suggest a lot of TLB misses and not much swap space.
472 *
473 * Format of swap PTE:
474 * bit 0: Present (zero)
475 * bit 1: _PAGE_FILE (zero)
476 * bits 2-6: swap type (arch independent layer uses 5 bits max)
477 * bits 7-9: bits 2:0 of offset
478 * bits 10-12: effectively _PAGE_PROTNONE (all zero)
479 * bits 13-31: bits 21:3 of swap offset
480 *
481 * Format of file PTE:
482 * bit 0: Present (zero)
483 * bit 1: _PAGE_FILE (zero)
484 * bits 2-9: bits 7:0 of offset
485 * bits 10-12: effectively _PAGE_PROTNONE (all zero)
486 * bits 13-31: bits 26:8 of swap offset
487 *
488 * The split offset makes some of the following macros a little gnarly,
489 * but there's plenty of precedent for this sort of thing.
490 */
491#define PTE_FILE_MAX_BITS 27
492
493/* Used for swap PTEs */
494#define __swp_type(swp_pte) (((swp_pte).val >> 2) & 0x1f)
495
496#define __swp_offset(swp_pte) \
497 ((((swp_pte).val >> 7) & 0x7) | (((swp_pte).val >> 10) & 0x003ffff8))
498
499#define __swp_entry(type, offset) \
500 ((swp_entry_t) { \
501 ((type << 2) | \
502 ((offset & 0x3ffff8) << 10) | ((offset & 0x7) << 7)) })
503
504/* Used for file PTEs */
505#define pte_file(pte) \
506 ((pte_val(pte) & (_PAGE_FILE | _PAGE_PRESENT)) == _PAGE_FILE)
507
508#define pte_to_pgoff(pte) \
509 (((pte_val(pte) >> 2) & 0xff) | ((pte_val(pte) >> 5) & 0x07ffff00))
510
511#define pgoff_to_pte(off) \
512 ((pte_t) { ((((off) & 0x7ffff00) << 5) | (((off) & 0xff) << 2)\
513 | _PAGE_FILE) })
514
515/* Oh boy. There are a lot of possible arch overrides found in this file. */
516#include <asm-generic/pgtable.h>
517
518#endif
diff --git a/arch/hexagon/mm/pgalloc.c b/arch/hexagon/mm/pgalloc.c
new file mode 100644
index 00000000000..b175e2d42b8
--- /dev/null
+++ b/arch/hexagon/mm/pgalloc.c
@@ -0,0 +1,23 @@
1/*
2 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA.
17 */
18
19#include <linux/init.h>
20
21void __init pgtable_cache_init(void)
22{
23}
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