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1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
3
4#include <linux/bug.h>
5#include <linux/module.h>
6#include <linux/init.h>
7#include <linux/signal.h>
8#include <linux/sched.h>
9#include <linux/kernel.h>
10#include <linux/errno.h>
11#include <linux/string.h>
12#include <linux/types.h>
13#include <linux/pagemap.h>
14#include <linux/ptrace.h>
15#include <linux/mman.h>
16#include <linux/mm.h>
17#include <linux/highmem.h>
18#include <linux/memblock.h>
19#include <linux/swap.h>
20#include <linux/proc_fs.h>
21#include <linux/pfn.h>
22#include <linux/initrd.h>
23
24#include <asm/setup.h>
25#include <asm/cachectl.h>
26#include <asm/dma.h>
27#include <asm/pgalloc.h>
28#include <asm/mmu_context.h>
29#include <asm/sections.h>
30#include <asm/tlb.h>
31#include <asm/cacheflush.h>
32
33#define PTRS_KERN_TABLE \
34 ((PTRS_PER_PGD - USER_PTRS_PER_PGD) * PTRS_PER_PTE)
35
36pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
37pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
38pte_t kernel_pte_tables[PTRS_KERN_TABLE] __page_aligned_bss;
39
40EXPORT_SYMBOL(invalid_pte_table);
41unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
42 __page_aligned_bss;
43EXPORT_SYMBOL(empty_zero_page);
44
45#ifdef CONFIG_BLK_DEV_INITRD
46static void __init setup_initrd(void)
47{
48 unsigned long size;
49
50 if (initrd_start >= initrd_end) {
51 pr_err("initrd not found or empty");
52 goto disable;
53 }
54
55 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
56 pr_err("initrd extends beyond end of memory");
57 goto disable;
58 }
59
60 size = initrd_end - initrd_start;
61
62 if (memblock_is_region_reserved(__pa(initrd_start), size)) {
63 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region",
64 __pa(initrd_start), size);
65 goto disable;
66 }
67
68 memblock_reserve(__pa(initrd_start), size);
69
70 pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
71 (void *)(initrd_start), size);
72
73 initrd_below_start_ok = 1;
74
75 return;
76
77disable:
78 initrd_start = initrd_end = 0;
79
80 pr_err(" - disabling initrd\n");
81}
82#endif
83
84void __init mem_init(void)
85{
86#ifdef CONFIG_HIGHMEM
87 unsigned long tmp;
88
89 set_max_mapnr(highend_pfn - ARCH_PFN_OFFSET);
90#else
91 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
92#endif
93 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
94
95#ifdef CONFIG_BLK_DEV_INITRD
96 setup_initrd();
97#endif
98
99 memblock_free_all();
100
101#ifdef CONFIG_HIGHMEM
102 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
103 struct page *page = pfn_to_page(tmp);
104
105 /* FIXME not sure about */
106 if (!memblock_is_reserved(tmp << PAGE_SHIFT))
107 free_highmem_page(page);
108 }
109#endif
110}
111
112void free_initmem(void)
113{
114 free_initmem_default(-1);
115}
116
117void pgd_init(unsigned long *p)
118{
119 int i;
120
121 for (i = 0; i < PTRS_PER_PGD; i++)
122 p[i] = __pa(invalid_pte_table);
123
124 flush_tlb_all();
125 local_icache_inv_all(NULL);
126}
127
128void __init mmu_init(unsigned long min_pfn, unsigned long max_pfn)
129{
130 int i;
131
132 for (i = 0; i < USER_PTRS_PER_PGD; i++)
133 swapper_pg_dir[i].pgd = __pa(invalid_pte_table);
134
135 for (i = USER_PTRS_PER_PGD; i < PTRS_PER_PGD; i++)
136 swapper_pg_dir[i].pgd =
137 __pa(kernel_pte_tables + (PTRS_PER_PTE * (i - USER_PTRS_PER_PGD)));
138
139 for (i = 0; i < PTRS_KERN_TABLE; i++)
140 set_pte(&kernel_pte_tables[i], __pte(_PAGE_GLOBAL));
141
142 for (i = min_pfn; i < max_pfn; i++)
143 set_pte(&kernel_pte_tables[i - PFN_DOWN(va_pa_offset)], pfn_pte(i, PAGE_KERNEL));
144
145 flush_tlb_all();
146 local_icache_inv_all(NULL);
147
148 /* Setup page mask to 4k */
149 write_mmu_pagemask(0);
150
151 setup_pgd(swapper_pg_dir, 0);
152}
153
154void __init fixrange_init(unsigned long start, unsigned long end,
155 pgd_t *pgd_base)
156{
157 pgd_t *pgd;
158 pud_t *pud;
159 pmd_t *pmd;
160 pte_t *pte;
161 int i, j, k;
162 unsigned long vaddr;
163
164 vaddr = start;
165 i = pgd_index(vaddr);
166 j = pud_index(vaddr);
167 k = pmd_index(vaddr);
168 pgd = pgd_base + i;
169
170 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
171 pud = (pud_t *)pgd;
172 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
173 pmd = (pmd_t *)pud;
174 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
175 if (pmd_none(*pmd)) {
176 pte = (pte_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
177 if (!pte)
178 panic("%s: Failed to allocate %lu bytes align=%lx\n",
179 __func__, PAGE_SIZE,
180 PAGE_SIZE);
181
182 set_pmd(pmd, __pmd(__pa(pte)));
183 BUG_ON(pte != pte_offset_kernel(pmd, 0));
184 }
185 vaddr += PMD_SIZE;
186 }
187 k = 0;
188 }
189 j = 0;
190 }
191}
192
193void __init fixaddr_init(void)
194{
195 unsigned long vaddr;
196
197 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
198 fixrange_init(vaddr, vaddr + PMD_SIZE, swapper_pg_dir);
199}
200
201static const pgprot_t protection_map[16] = {
202 [VM_NONE] = PAGE_NONE,
203 [VM_READ] = PAGE_READ,
204 [VM_WRITE] = PAGE_READ,
205 [VM_WRITE | VM_READ] = PAGE_READ,
206 [VM_EXEC] = PAGE_READ,
207 [VM_EXEC | VM_READ] = PAGE_READ,
208 [VM_EXEC | VM_WRITE] = PAGE_READ,
209 [VM_EXEC | VM_WRITE | VM_READ] = PAGE_READ,
210 [VM_SHARED] = PAGE_NONE,
211 [VM_SHARED | VM_READ] = PAGE_READ,
212 [VM_SHARED | VM_WRITE] = PAGE_WRITE,
213 [VM_SHARED | VM_WRITE | VM_READ] = PAGE_WRITE,
214 [VM_SHARED | VM_EXEC] = PAGE_READ,
215 [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READ,
216 [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_WRITE,
217 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_WRITE
218};
219DECLARE_VM_GET_PAGE_PROT
1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
3
4#include <linux/bug.h>
5#include <linux/module.h>
6#include <linux/init.h>
7#include <linux/signal.h>
8#include <linux/sched.h>
9#include <linux/kernel.h>
10#include <linux/errno.h>
11#include <linux/string.h>
12#include <linux/types.h>
13#include <linux/pagemap.h>
14#include <linux/ptrace.h>
15#include <linux/mman.h>
16#include <linux/mm.h>
17#include <linux/highmem.h>
18#include <linux/memblock.h>
19#include <linux/swap.h>
20#include <linux/proc_fs.h>
21#include <linux/pfn.h>
22#include <linux/initrd.h>
23
24#include <asm/setup.h>
25#include <asm/cachectl.h>
26#include <asm/dma.h>
27#include <asm/pgalloc.h>
28#include <asm/mmu_context.h>
29#include <asm/sections.h>
30#include <asm/tlb.h>
31
32pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
33pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
34EXPORT_SYMBOL(invalid_pte_table);
35unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
36 __page_aligned_bss;
37EXPORT_SYMBOL(empty_zero_page);
38
39#ifdef CONFIG_BLK_DEV_INITRD
40static void __init setup_initrd(void)
41{
42 unsigned long size;
43
44 if (initrd_start >= initrd_end) {
45 pr_err("initrd not found or empty");
46 goto disable;
47 }
48
49 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
50 pr_err("initrd extends beyond end of memory");
51 goto disable;
52 }
53
54 size = initrd_end - initrd_start;
55
56 if (memblock_is_region_reserved(__pa(initrd_start), size)) {
57 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region",
58 __pa(initrd_start), size);
59 goto disable;
60 }
61
62 memblock_reserve(__pa(initrd_start), size);
63
64 pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
65 (void *)(initrd_start), size);
66
67 initrd_below_start_ok = 1;
68
69 return;
70
71disable:
72 initrd_start = initrd_end = 0;
73
74 pr_err(" - disabling initrd\n");
75}
76#endif
77
78void __init mem_init(void)
79{
80#ifdef CONFIG_HIGHMEM
81 unsigned long tmp;
82
83 max_mapnr = highend_pfn;
84#else
85 max_mapnr = max_low_pfn;
86#endif
87 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
88
89#ifdef CONFIG_BLK_DEV_INITRD
90 setup_initrd();
91#endif
92
93 memblock_free_all();
94
95#ifdef CONFIG_HIGHMEM
96 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
97 struct page *page = pfn_to_page(tmp);
98
99 /* FIXME not sure about */
100 if (!memblock_is_reserved(tmp << PAGE_SHIFT))
101 free_highmem_page(page);
102 }
103#endif
104 mem_init_print_info(NULL);
105}
106
107extern char __init_begin[], __init_end[];
108
109void free_initmem(void)
110{
111 unsigned long addr;
112
113 addr = (unsigned long) &__init_begin;
114
115 while (addr < (unsigned long) &__init_end) {
116 ClearPageReserved(virt_to_page(addr));
117 init_page_count(virt_to_page(addr));
118 free_page(addr);
119 totalram_pages_inc();
120 addr += PAGE_SIZE;
121 }
122
123 pr_info("Freeing unused kernel memory: %dk freed\n",
124 ((unsigned int)&__init_end - (unsigned int)&__init_begin) >> 10);
125}
126
127void pgd_init(unsigned long *p)
128{
129 int i;
130
131 for (i = 0; i < PTRS_PER_PGD; i++)
132 p[i] = __pa(invalid_pte_table);
133}
134
135void __init pre_mmu_init(void)
136{
137 /*
138 * Setup page-table and enable TLB-hardrefill
139 */
140 flush_tlb_all();
141 pgd_init((unsigned long *)swapper_pg_dir);
142 TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir);
143 TLBMISS_HANDLER_SETUP_PGD_KERNEL(swapper_pg_dir);
144
145 /* Setup page mask to 4k */
146 write_mmu_pagemask(0);
147}
148
149void __init fixrange_init(unsigned long start, unsigned long end,
150 pgd_t *pgd_base)
151{
152 pgd_t *pgd;
153 pud_t *pud;
154 pmd_t *pmd;
155 pte_t *pte;
156 int i, j, k;
157 unsigned long vaddr;
158
159 vaddr = start;
160 i = pgd_index(vaddr);
161 j = pud_index(vaddr);
162 k = pmd_index(vaddr);
163 pgd = pgd_base + i;
164
165 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
166 pud = (pud_t *)pgd;
167 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
168 pmd = (pmd_t *)pud;
169 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
170 if (pmd_none(*pmd)) {
171 pte = (pte_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
172 if (!pte)
173 panic("%s: Failed to allocate %lu bytes align=%lx\n",
174 __func__, PAGE_SIZE,
175 PAGE_SIZE);
176
177 set_pmd(pmd, __pmd(__pa(pte)));
178 BUG_ON(pte != pte_offset_kernel(pmd, 0));
179 }
180 vaddr += PMD_SIZE;
181 }
182 k = 0;
183 }
184 j = 0;
185 }
186}
187
188void __init fixaddr_init(void)
189{
190 unsigned long vaddr;
191
192 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
193 fixrange_init(vaddr, vaddr + PMD_SIZE, swapper_pg_dir);
194}