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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * OpenRISC idle.c
4 *
5 * Linux architectural port borrowing liberally from similar works of
6 * others. All original copyrights apply as per the original source
7 * declaration.
8 *
9 * Modifications for the OpenRISC architecture:
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
12 */
13
14#include <linux/signal.h>
15#include <linux/sched.h>
16#include <linux/kernel.h>
17#include <linux/errno.h>
18#include <linux/string.h>
19#include <linux/types.h>
20#include <linux/ptrace.h>
21#include <linux/mman.h>
22#include <linux/mm.h>
23#include <linux/swap.h>
24#include <linux/smp.h>
25#include <linux/memblock.h>
26#include <linux/init.h>
27#include <linux/delay.h>
28#include <linux/blkdev.h> /* for initrd_* */
29#include <linux/pagemap.h>
30
31#include <asm/pgalloc.h>
32#include <asm/pgtable.h>
33#include <asm/dma.h>
34#include <asm/io.h>
35#include <asm/tlb.h>
36#include <asm/mmu_context.h>
37#include <asm/kmap_types.h>
38#include <asm/fixmap.h>
39#include <asm/tlbflush.h>
40#include <asm/sections.h>
41
42int mem_init_done;
43
44DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
45
46static void __init zone_sizes_init(void)
47{
48 unsigned long zones_size[MAX_NR_ZONES];
49
50 /* Clear the zone sizes */
51 memset(zones_size, 0, sizeof(zones_size));
52
53 /*
54 * We use only ZONE_NORMAL
55 */
56 zones_size[ZONE_NORMAL] = max_low_pfn;
57
58 free_area_init(zones_size);
59}
60
61extern const char _s_kernel_ro[], _e_kernel_ro[];
62
63/*
64 * Map all physical memory into kernel's address space.
65 *
66 * This is explicitly coded for two-level page tables, so if you need
67 * something else then this needs to change.
68 */
69static void __init map_ram(void)
70{
71 unsigned long v, p, e;
72 pgprot_t prot;
73 pgd_t *pge;
74 pud_t *pue;
75 pmd_t *pme;
76 pte_t *pte;
77 /* These mark extents of read-only kernel pages...
78 * ...from vmlinux.lds.S
79 */
80 struct memblock_region *region;
81
82 v = PAGE_OFFSET;
83
84 for_each_memblock(memory, region) {
85 p = (u32) region->base & PAGE_MASK;
86 e = p + (u32) region->size;
87
88 v = (u32) __va(p);
89 pge = pgd_offset_k(v);
90
91 while (p < e) {
92 int j;
93 pue = pud_offset(pge, v);
94 pme = pmd_offset(pue, v);
95
96 if ((u32) pue != (u32) pge || (u32) pme != (u32) pge) {
97 panic("%s: OR1K kernel hardcoded for "
98 "two-level page tables",
99 __func__);
100 }
101
102 /* Alloc one page for holding PTE's... */
103 pte = memblock_alloc_raw(PAGE_SIZE, PAGE_SIZE);
104 if (!pte)
105 panic("%s: Failed to allocate page for PTEs\n",
106 __func__);
107 set_pmd(pme, __pmd(_KERNPG_TABLE + __pa(pte)));
108
109 /* Fill the newly allocated page with PTE'S */
110 for (j = 0; p < e && j < PTRS_PER_PTE;
111 v += PAGE_SIZE, p += PAGE_SIZE, j++, pte++) {
112 if (v >= (u32) _e_kernel_ro ||
113 v < (u32) _s_kernel_ro)
114 prot = PAGE_KERNEL;
115 else
116 prot = PAGE_KERNEL_RO;
117
118 set_pte(pte, mk_pte_phys(p, prot));
119 }
120
121 pge++;
122 }
123
124 printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__,
125 region->base, region->base + region->size);
126 }
127}
128
129void __init paging_init(void)
130{
131 extern void tlb_init(void);
132
133 unsigned long end;
134 int i;
135
136 printk(KERN_INFO "Setting up paging and PTEs.\n");
137
138 /* clear out the init_mm.pgd that will contain the kernel's mappings */
139
140 for (i = 0; i < PTRS_PER_PGD; i++)
141 swapper_pg_dir[i] = __pgd(0);
142
143 /* make sure the current pgd table points to something sane
144 * (even if it is most probably not used until the next
145 * switch_mm)
146 */
147 current_pgd[smp_processor_id()] = init_mm.pgd;
148
149 end = (unsigned long)__va(max_low_pfn * PAGE_SIZE);
150
151 map_ram();
152
153 zone_sizes_init();
154
155 /* self modifying code ;) */
156 /* Since the old TLB miss handler has been running up until now,
157 * the kernel pages are still all RW, so we can still modify the
158 * text directly... after this change and a TLB flush, the kernel
159 * pages will become RO.
160 */
161 {
162 extern unsigned long dtlb_miss_handler;
163 extern unsigned long itlb_miss_handler;
164
165 unsigned long *dtlb_vector = __va(0x900);
166 unsigned long *itlb_vector = __va(0xa00);
167
168 printk(KERN_INFO "itlb_miss_handler %p\n", &itlb_miss_handler);
169 *itlb_vector = ((unsigned long)&itlb_miss_handler -
170 (unsigned long)itlb_vector) >> 2;
171
172 /* Soft ordering constraint to ensure that dtlb_vector is
173 * the last thing updated
174 */
175 barrier();
176
177 printk(KERN_INFO "dtlb_miss_handler %p\n", &dtlb_miss_handler);
178 *dtlb_vector = ((unsigned long)&dtlb_miss_handler -
179 (unsigned long)dtlb_vector) >> 2;
180
181 }
182
183 /* Soft ordering constraint to ensure that cache invalidation and
184 * TLB flush really happen _after_ code has been modified.
185 */
186 barrier();
187
188 /* Invalidate instruction caches after code modification */
189 mtspr(SPR_ICBIR, 0x900);
190 mtspr(SPR_ICBIR, 0xa00);
191
192 /* New TLB miss handlers and kernel page tables are in now place.
193 * Make sure that page flags get updated for all pages in TLB by
194 * flushing the TLB and forcing all TLB entries to be recreated
195 * from their page table flags.
196 */
197 flush_tlb_all();
198}
199
200/* References to section boundaries */
201
202void __init mem_init(void)
203{
204 BUG_ON(!mem_map);
205
206 max_mapnr = max_low_pfn;
207 high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);
208
209 /* clear the zero-page */
210 memset((void *)empty_zero_page, 0, PAGE_SIZE);
211
212 /* this will put all low memory onto the freelists */
213 memblock_free_all();
214
215 mem_init_print_info(NULL);
216
217 printk("mem_init_done ...........................................\n");
218 mem_init_done = 1;
219 return;
220}
1/*
2 * OpenRISC idle.c
3 *
4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
6 * declaration.
7 *
8 * Modifications for the OpenRISC architecture:
9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17
18#include <linux/signal.h>
19#include <linux/sched.h>
20#include <linux/kernel.h>
21#include <linux/errno.h>
22#include <linux/string.h>
23#include <linux/types.h>
24#include <linux/ptrace.h>
25#include <linux/mman.h>
26#include <linux/mm.h>
27#include <linux/swap.h>
28#include <linux/smp.h>
29#include <linux/bootmem.h>
30#include <linux/init.h>
31#include <linux/delay.h>
32#include <linux/blkdev.h> /* for initrd_* */
33#include <linux/pagemap.h>
34#include <linux/memblock.h>
35
36#include <asm/segment.h>
37#include <asm/pgalloc.h>
38#include <asm/pgtable.h>
39#include <asm/dma.h>
40#include <asm/io.h>
41#include <asm/tlb.h>
42#include <asm/mmu_context.h>
43#include <asm/kmap_types.h>
44#include <asm/fixmap.h>
45#include <asm/tlbflush.h>
46
47int mem_init_done;
48
49DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
50
51static void __init zone_sizes_init(void)
52{
53 unsigned long zones_size[MAX_NR_ZONES];
54
55 /* Clear the zone sizes */
56 memset(zones_size, 0, sizeof(zones_size));
57
58 /*
59 * We use only ZONE_NORMAL
60 */
61 zones_size[ZONE_NORMAL] = max_low_pfn;
62
63 free_area_init(zones_size);
64}
65
66extern const char _s_kernel_ro[], _e_kernel_ro[];
67
68/*
69 * Map all physical memory into kernel's address space.
70 *
71 * This is explicitly coded for two-level page tables, so if you need
72 * something else then this needs to change.
73 */
74static void __init map_ram(void)
75{
76 unsigned long v, p, e;
77 pgprot_t prot;
78 pgd_t *pge;
79 pud_t *pue;
80 pmd_t *pme;
81 pte_t *pte;
82 /* These mark extents of read-only kernel pages...
83 * ...from vmlinux.lds.S
84 */
85 struct memblock_region *region;
86
87 v = PAGE_OFFSET;
88
89 for_each_memblock(memory, region) {
90 p = (u32) region->base & PAGE_MASK;
91 e = p + (u32) region->size;
92
93 v = (u32) __va(p);
94 pge = pgd_offset_k(v);
95
96 while (p < e) {
97 int j;
98 pue = pud_offset(pge, v);
99 pme = pmd_offset(pue, v);
100
101 if ((u32) pue != (u32) pge || (u32) pme != (u32) pge) {
102 panic("%s: OR1K kernel hardcoded for "
103 "two-level page tables",
104 __func__);
105 }
106
107 /* Alloc one page for holding PTE's... */
108 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
109 set_pmd(pme, __pmd(_KERNPG_TABLE + __pa(pte)));
110
111 /* Fill the newly allocated page with PTE'S */
112 for (j = 0; p < e && j < PTRS_PER_PGD;
113 v += PAGE_SIZE, p += PAGE_SIZE, j++, pte++) {
114 if (v >= (u32) _e_kernel_ro ||
115 v < (u32) _s_kernel_ro)
116 prot = PAGE_KERNEL;
117 else
118 prot = PAGE_KERNEL_RO;
119
120 set_pte(pte, mk_pte_phys(p, prot));
121 }
122
123 pge++;
124 }
125
126 printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__,
127 region->base, region->base + region->size);
128 }
129}
130
131void __init paging_init(void)
132{
133 extern void tlb_init(void);
134
135 unsigned long end;
136 int i;
137
138 printk(KERN_INFO "Setting up paging and PTEs.\n");
139
140 /* clear out the init_mm.pgd that will contain the kernel's mappings */
141
142 for (i = 0; i < PTRS_PER_PGD; i++)
143 swapper_pg_dir[i] = __pgd(0);
144
145 /* make sure the current pgd table points to something sane
146 * (even if it is most probably not used until the next
147 * switch_mm)
148 */
149 current_pgd = init_mm.pgd;
150
151 end = (unsigned long)__va(max_low_pfn * PAGE_SIZE);
152
153 map_ram();
154
155 zone_sizes_init();
156
157 /* self modifying code ;) */
158 /* Since the old TLB miss handler has been running up until now,
159 * the kernel pages are still all RW, so we can still modify the
160 * text directly... after this change and a TLB flush, the kernel
161 * pages will become RO.
162 */
163 {
164 extern unsigned long dtlb_miss_handler;
165 extern unsigned long itlb_miss_handler;
166
167 unsigned long *dtlb_vector = __va(0x900);
168 unsigned long *itlb_vector = __va(0xa00);
169
170 printk(KERN_INFO "dtlb_miss_handler %p\n", &dtlb_miss_handler);
171 *dtlb_vector = ((unsigned long)&dtlb_miss_handler -
172 (unsigned long)dtlb_vector) >> 2;
173
174 printk(KERN_INFO "itlb_miss_handler %p\n", &itlb_miss_handler);
175 *itlb_vector = ((unsigned long)&itlb_miss_handler -
176 (unsigned long)itlb_vector) >> 2;
177 }
178
179 /* Invalidate instruction caches after code modification */
180 mtspr(SPR_ICBIR, 0x900);
181 mtspr(SPR_ICBIR, 0xa00);
182
183 /* New TLB miss handlers and kernel page tables are in now place.
184 * Make sure that page flags get updated for all pages in TLB by
185 * flushing the TLB and forcing all TLB entries to be recreated
186 * from their page table flags.
187 */
188 flush_tlb_all();
189}
190
191/* References to section boundaries */
192
193extern char _stext, _etext, _edata, __bss_start, _end;
194extern char __init_begin, __init_end;
195
196static int __init free_pages_init(void)
197{
198 int reservedpages, pfn;
199
200 /* this will put all low memory onto the freelists */
201 totalram_pages = free_all_bootmem();
202
203 reservedpages = 0;
204 for (pfn = 0; pfn < max_low_pfn; pfn++) {
205 /*
206 * Only count reserved RAM pages
207 */
208 if (PageReserved(mem_map + pfn))
209 reservedpages++;
210 }
211
212 return reservedpages;
213}
214
215static void __init set_max_mapnr_init(void)
216{
217 max_mapnr = num_physpages = max_low_pfn;
218}
219
220void __init mem_init(void)
221{
222 int codesize, reservedpages, datasize, initsize;
223
224 BUG_ON(!mem_map);
225
226 set_max_mapnr_init();
227
228 high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);
229
230 /* clear the zero-page */
231 memset((void *)empty_zero_page, 0, PAGE_SIZE);
232
233 reservedpages = free_pages_init();
234
235 codesize = (unsigned long)&_etext - (unsigned long)&_stext;
236 datasize = (unsigned long)&_edata - (unsigned long)&_etext;
237 initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
238
239 printk(KERN_INFO
240 "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
241 (unsigned long)nr_free_pages() << (PAGE_SHIFT - 10),
242 max_mapnr << (PAGE_SHIFT - 10), codesize >> 10,
243 reservedpages << (PAGE_SHIFT - 10), datasize >> 10,
244 initsize >> 10, (unsigned long)(0 << (PAGE_SHIFT - 10))
245 );
246
247 printk("mem_init_done ...........................................\n");
248 mem_init_done = 1;
249 return;
250}
251
252#ifdef CONFIG_BLK_DEV_INITRD
253void free_initrd_mem(unsigned long start, unsigned long end)
254{
255 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
256 (end - start) >> 10);
257
258 for (; start < end; start += PAGE_SIZE) {
259 ClearPageReserved(virt_to_page(start));
260 init_page_count(virt_to_page(start));
261 free_page(start);
262 totalram_pages++;
263 }
264}
265#endif
266
267void free_initmem(void)
268{
269 unsigned long addr;
270
271 addr = (unsigned long)(&__init_begin);
272 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
273 ClearPageReserved(virt_to_page(addr));
274 init_page_count(virt_to_page(addr));
275 free_page(addr);
276 totalram_pages++;
277 }
278 printk(KERN_INFO "Freeing unused kernel memory: %luk freed\n",
279 ((unsigned long)&__init_end -
280 (unsigned long)&__init_begin) >> 10);
281}