1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifdef CONFIG_MMU
 3#include <linux/list.h>
 4#include <linux/vmalloc.h>
 5
 6#include <asm/pgtable.h>
 7
 8/* the upper-most page table pointer */
 9extern pmd_t *top_pmd;
10
11extern int icache_size;
12
13/*
14 * 0xffff8000 to 0xffffffff is reserved for any ARM architecture
15 * specific hacks for copying pages efficiently, while 0xffff4000
16 * is reserved for VIPT aliasing flushing by generic code.
17 *
18 * Note that we don't allow VIPT aliasing caches with SMP.
19 */
20#define COPYPAGE_MINICACHE	0xffff8000
21#define COPYPAGE_V6_FROM	0xffff8000
22#define COPYPAGE_V6_TO		0xffffc000
23/* PFN alias flushing, for VIPT caches */
24#define FLUSH_ALIAS_START	0xffff4000
25
26static inline void set_top_pte(unsigned long va, pte_t pte)
27{
28	pte_t *ptep = pte_offset_kernel(top_pmd, va);
29	set_pte_ext(ptep, pte, 0);
30	local_flush_tlb_kernel_page(va);
31}
32
33static inline pte_t get_top_pte(unsigned long va)
34{
35	pte_t *ptep = pte_offset_kernel(top_pmd, va);
36	return *ptep;
37}
38
39static inline pmd_t *pmd_off_k(unsigned long virt)
40{
41	return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
42}
43
44struct mem_type {
45	pteval_t prot_pte;
46	pteval_t prot_pte_s2;
47	pmdval_t prot_l1;
48	pmdval_t prot_sect;
49	unsigned int domain;
50};
51
52const struct mem_type *get_mem_type(unsigned int type);
53
54extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
55
56/*
57 * ARM specific vm_struct->flags bits.
58 */
59
60/* (super)section-mapped I/O regions used by ioremap()/iounmap() */
61#define VM_ARM_SECTION_MAPPING	0x80000000
62
63/* permanent static mappings from iotable_init() */
64#define VM_ARM_STATIC_MAPPING	0x40000000
65
66/* empty mapping */
67#define VM_ARM_EMPTY_MAPPING	0x20000000
68
69/* mapping type (attributes) for permanent static mappings */
70#define VM_ARM_MTYPE(mt)		((mt) << 20)
71#define VM_ARM_MTYPE_MASK	(0x1f << 20)
72
73
74struct static_vm {
75	struct vm_struct vm;
76	struct list_head list;
77};
78
79extern struct list_head static_vmlist;
80extern struct static_vm *find_static_vm_vaddr(void *vaddr);
81extern __init void add_static_vm_early(struct static_vm *svm);
82
83#endif
84
85#ifdef CONFIG_ZONE_DMA
86extern phys_addr_t arm_dma_limit;
87extern unsigned long arm_dma_pfn_limit;
88#else
89#define arm_dma_limit ((phys_addr_t)~0)
90#define arm_dma_pfn_limit (~0ul >> PAGE_SHIFT)
91#endif
92
93extern phys_addr_t arm_lowmem_limit;
94
95void __init bootmem_init(void);
96void arm_mm_memblock_reserve(void);
97void dma_contiguous_remap(void);
98
99unsigned long __clear_cr(unsigned long mask);

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifdef CONFIG_MMU
 3#include <linux/list.h>
 4#include <linux/vmalloc.h>
 5#include <linux/pgtable.h>
 
 6
 7/* the upper-most page table pointer */
 8extern pmd_t *top_pmd;
 9
10extern int icache_size;
11
12/*
13 * 0xffff8000 to 0xffffffff is reserved for any ARM architecture
14 * specific hacks for copying pages efficiently, while 0xffff4000
15 * is reserved for VIPT aliasing flushing by generic code.
16 *
17 * Note that we don't allow VIPT aliasing caches with SMP.
18 */
19#define COPYPAGE_MINICACHE	0xffff8000
20#define COPYPAGE_V6_FROM	0xffff8000
21#define COPYPAGE_V6_TO		0xffffc000
22/* PFN alias flushing, for VIPT caches */
23#define FLUSH_ALIAS_START	0xffff4000
24
25static inline void set_top_pte(unsigned long va, pte_t pte)
26{
27	pte_t *ptep = pte_offset_kernel(top_pmd, va);
28	set_pte_ext(ptep, pte, 0);
29	local_flush_tlb_kernel_page(va);
30}
31
32static inline pte_t get_top_pte(unsigned long va)
33{
34	pte_t *ptep = pte_offset_kernel(top_pmd, va);
35	return *ptep;
 
 
 
 
 
36}
37
38struct mem_type {
39	pteval_t prot_pte;
40	pteval_t prot_pte_s2;
41	pmdval_t prot_l1;
42	pmdval_t prot_sect;
43	unsigned int domain;
44};
45
46const struct mem_type *get_mem_type(unsigned int type);
47
48extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
49
50/*
51 * ARM specific vm_struct->flags bits.
52 */
53
54/* (super)section-mapped I/O regions used by ioremap()/iounmap() */
55#define VM_ARM_SECTION_MAPPING	0x80000000
56
57/* permanent static mappings from iotable_init() */
58#define VM_ARM_STATIC_MAPPING	0x40000000
59
60/* empty mapping */
61#define VM_ARM_EMPTY_MAPPING	0x20000000
62
63/* mapping type (attributes) for permanent static mappings */
64#define VM_ARM_MTYPE(mt)		((mt) << 20)
65#define VM_ARM_MTYPE_MASK	(0x1f << 20)
66
67
68struct static_vm {
69	struct vm_struct vm;
70	struct list_head list;
71};
72
73extern struct list_head static_vmlist;
74extern struct static_vm *find_static_vm_vaddr(void *vaddr);
75extern __init void add_static_vm_early(struct static_vm *svm);
76
77#endif
78
79#ifdef CONFIG_ZONE_DMA
80extern phys_addr_t arm_dma_limit;
81extern unsigned long arm_dma_pfn_limit;
82#else
83#define arm_dma_limit ((phys_addr_t)~0)
84#define arm_dma_pfn_limit (~0ul >> PAGE_SHIFT)
85#endif
86
87extern phys_addr_t arm_lowmem_limit;
88
89void __init bootmem_init(void);
90void arm_mm_memblock_reserve(void);
91void dma_contiguous_remap(void);
92
93unsigned long __clear_cr(unsigned long mask);