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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 */
5
6#include <linux/kernel.h>
7#include <linux/mm.h>
8#include <linux/memblock.h>
9#ifdef CONFIG_BLK_DEV_INITRD
10#include <linux/initrd.h>
11#endif
12#include <linux/of_fdt.h>
13#include <linux/swap.h>
14#include <linux/module.h>
15#include <linux/highmem.h>
16#include <asm/page.h>
17#include <asm/sections.h>
18#include <asm/arcregs.h>
19
20pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
21char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE);
22EXPORT_SYMBOL(empty_zero_page);
23
24static const unsigned long low_mem_start = CONFIG_LINUX_RAM_BASE;
25static unsigned long low_mem_sz;
26
27#ifdef CONFIG_HIGHMEM
28static unsigned long min_high_pfn, max_high_pfn;
29static phys_addr_t high_mem_start;
30static phys_addr_t high_mem_sz;
31#endif
32
33#ifdef CONFIG_DISCONTIGMEM
34struct pglist_data node_data[MAX_NUMNODES] __read_mostly;
35EXPORT_SYMBOL(node_data);
36#endif
37
38long __init arc_get_mem_sz(void)
39{
40 return low_mem_sz;
41}
42
43/* User can over-ride above with "mem=nnn[KkMm]" in cmdline */
44static int __init setup_mem_sz(char *str)
45{
46 low_mem_sz = memparse(str, NULL) & PAGE_MASK;
47
48 /* early console might not be setup yet - it will show up later */
49 pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(low_mem_sz));
50
51 return 0;
52}
53early_param("mem", setup_mem_sz);
54
55void __init early_init_dt_add_memory_arch(u64 base, u64 size)
56{
57 int in_use = 0;
58
59 if (!low_mem_sz) {
60 if (base != low_mem_start)
61 panic("CONFIG_LINUX_RAM_BASE != DT memory { }");
62
63 low_mem_sz = size;
64 in_use = 1;
65 memblock_add_node(base, size, 0);
66 } else {
67#ifdef CONFIG_HIGHMEM
68 high_mem_start = base;
69 high_mem_sz = size;
70 in_use = 1;
71 memblock_add_node(base, size, 1);
72 memblock_reserve(base, size);
73#endif
74 }
75
76 pr_info("Memory @ %llx [%lldM] %s\n",
77 base, TO_MB(size), !in_use ? "Not used":"");
78}
79
80bool arch_has_descending_max_zone_pfns(void)
81{
82 return !IS_ENABLED(CONFIG_ARC_HAS_PAE40);
83}
84
85/*
86 * First memory setup routine called from setup_arch()
87 * 1. setup swapper's mm @init_mm
88 * 2. Count the pages we have and setup bootmem allocator
89 * 3. zone setup
90 */
91void __init setup_arch_memory(void)
92{
93 unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
94
95 init_mm.start_code = (unsigned long)_text;
96 init_mm.end_code = (unsigned long)_etext;
97 init_mm.end_data = (unsigned long)_edata;
98 init_mm.brk = (unsigned long)_end;
99
100 /* first page of system - kernel .vector starts here */
101 min_low_pfn = ARCH_PFN_OFFSET;
102
103 /* Last usable page of low mem */
104 max_low_pfn = max_pfn = PFN_DOWN(low_mem_start + low_mem_sz);
105
106#ifdef CONFIG_FLATMEM
107 /* pfn_valid() uses this */
108 max_mapnr = max_low_pfn - min_low_pfn;
109#endif
110
111 /*------------- bootmem allocator setup -----------------------*/
112
113 /*
114 * seed the bootmem allocator after any DT memory node parsing or
115 * "mem=xxx" cmdline overrides have potentially updated @arc_mem_sz
116 *
117 * Only low mem is added, otherwise we have crashes when allocating
118 * mem_map[] itself. NO_BOOTMEM allocates mem_map[] at the end of
119 * avail memory, ending in highmem with a > 32-bit address. However
120 * it then tries to memset it with a truncaed 32-bit handle, causing
121 * the crash
122 */
123
124 memblock_reserve(CONFIG_LINUX_LINK_BASE,
125 __pa(_end) - CONFIG_LINUX_LINK_BASE);
126
127#ifdef CONFIG_BLK_DEV_INITRD
128 if (phys_initrd_size) {
129 memblock_reserve(phys_initrd_start, phys_initrd_size);
130 initrd_start = (unsigned long)__va(phys_initrd_start);
131 initrd_end = initrd_start + phys_initrd_size;
132 }
133#endif
134
135 early_init_fdt_reserve_self();
136 early_init_fdt_scan_reserved_mem();
137
138 memblock_dump_all();
139
140 /*----------------- node/zones setup --------------------------*/
141 max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
142
143#ifdef CONFIG_HIGHMEM
144 /*
145 * Populate a new node with highmem
146 *
147 * On ARC (w/o PAE) HIGHMEM addresses are actually smaller (0 based)
148 * than addresses in normal ala low memory (0x8000_0000 based).
149 * Even with PAE, the huge peripheral space hole would waste a lot of
150 * mem with single mem_map[]. This warrants a mem_map per region design.
151 * Thus HIGHMEM on ARC is imlemented with DISCONTIGMEM.
152 *
153 * DISCONTIGMEM in turns requires multiple nodes. node 0 above is
154 * populated with normal memory zone while node 1 only has highmem
155 */
156 node_set_online(1);
157
158 min_high_pfn = PFN_DOWN(high_mem_start);
159 max_high_pfn = PFN_DOWN(high_mem_start + high_mem_sz);
160
161 max_zone_pfn[ZONE_HIGHMEM] = min_low_pfn;
162
163 high_memory = (void *)(min_high_pfn << PAGE_SHIFT);
164 kmap_init();
165#endif
166
167 free_area_init(max_zone_pfn);
168}
169
170static void __init highmem_init(void)
171{
172#ifdef CONFIG_HIGHMEM
173 unsigned long tmp;
174
175 memblock_free(high_mem_start, high_mem_sz);
176 for (tmp = min_high_pfn; tmp < max_high_pfn; tmp++)
177 free_highmem_page(pfn_to_page(tmp));
178#endif
179}
180
181/*
182 * mem_init - initializes memory
183 *
184 * Frees up bootmem
185 * Calculates and displays memory available/used
186 */
187void __init mem_init(void)
188{
189 memblock_free_all();
190 highmem_init();
191 mem_init_print_info(NULL);
192}
1/*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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 as
6 * published by the Free Software Foundation.
7 */
8
9#include <linux/kernel.h>
10#include <linux/mm.h>
11#include <linux/bootmem.h>
12#include <linux/memblock.h>
13#ifdef CONFIG_BLK_DEV_INITRD
14#include <linux/initrd.h>
15#endif
16#include <linux/of_fdt.h>
17#include <linux/swap.h>
18#include <linux/module.h>
19#include <linux/highmem.h>
20#include <asm/page.h>
21#include <asm/pgalloc.h>
22#include <asm/sections.h>
23#include <asm/arcregs.h>
24
25pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
26char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE);
27EXPORT_SYMBOL(empty_zero_page);
28
29static const unsigned long low_mem_start = CONFIG_LINUX_LINK_BASE;
30static unsigned long low_mem_sz;
31
32#ifdef CONFIG_HIGHMEM
33static unsigned long min_high_pfn, max_high_pfn;
34static u64 high_mem_start;
35static u64 high_mem_sz;
36#endif
37
38#ifdef CONFIG_DISCONTIGMEM
39struct pglist_data node_data[MAX_NUMNODES] __read_mostly;
40EXPORT_SYMBOL(node_data);
41#endif
42
43/* User can over-ride above with "mem=nnn[KkMm]" in cmdline */
44static int __init setup_mem_sz(char *str)
45{
46 low_mem_sz = memparse(str, NULL) & PAGE_MASK;
47
48 /* early console might not be setup yet - it will show up later */
49 pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(low_mem_sz));
50
51 return 0;
52}
53early_param("mem", setup_mem_sz);
54
55void __init early_init_dt_add_memory_arch(u64 base, u64 size)
56{
57 int in_use = 0;
58
59 if (!low_mem_sz) {
60 if (base != low_mem_start)
61 panic("CONFIG_LINUX_LINK_BASE != DT memory { }");
62
63 low_mem_sz = size;
64 in_use = 1;
65 } else {
66#ifdef CONFIG_HIGHMEM
67 high_mem_start = base;
68 high_mem_sz = size;
69 in_use = 1;
70#endif
71 }
72
73 pr_info("Memory @ %llx [%lldM] %s\n",
74 base, TO_MB(size), !in_use ? "Not used":"");
75}
76
77#ifdef CONFIG_BLK_DEV_INITRD
78static int __init early_initrd(char *p)
79{
80 unsigned long start, size;
81 char *endp;
82
83 start = memparse(p, &endp);
84 if (*endp == ',') {
85 size = memparse(endp + 1, NULL);
86
87 initrd_start = (unsigned long)__va(start);
88 initrd_end = (unsigned long)__va(start + size);
89 }
90 return 0;
91}
92early_param("initrd", early_initrd);
93#endif
94
95/*
96 * First memory setup routine called from setup_arch()
97 * 1. setup swapper's mm @init_mm
98 * 2. Count the pages we have and setup bootmem allocator
99 * 3. zone setup
100 */
101void __init setup_arch_memory(void)
102{
103 unsigned long zones_size[MAX_NR_ZONES];
104 unsigned long zones_holes[MAX_NR_ZONES];
105
106 init_mm.start_code = (unsigned long)_text;
107 init_mm.end_code = (unsigned long)_etext;
108 init_mm.end_data = (unsigned long)_edata;
109 init_mm.brk = (unsigned long)_end;
110
111 /* first page of system - kernel .vector starts here */
112 min_low_pfn = ARCH_PFN_OFFSET;
113
114 /* Last usable page of low mem */
115 max_low_pfn = max_pfn = PFN_DOWN(low_mem_start + low_mem_sz);
116
117#ifdef CONFIG_FLATMEM
118 /* pfn_valid() uses this */
119 max_mapnr = max_low_pfn - min_low_pfn;
120#endif
121
122 /*------------- bootmem allocator setup -----------------------*/
123
124 /*
125 * seed the bootmem allocator after any DT memory node parsing or
126 * "mem=xxx" cmdline overrides have potentially updated @arc_mem_sz
127 *
128 * Only low mem is added, otherwise we have crashes when allocating
129 * mem_map[] itself. NO_BOOTMEM allocates mem_map[] at the end of
130 * avail memory, ending in highmem with a > 32-bit address. However
131 * it then tries to memset it with a truncaed 32-bit handle, causing
132 * the crash
133 */
134
135 memblock_add_node(low_mem_start, low_mem_sz, 0);
136 memblock_reserve(low_mem_start, __pa(_end) - low_mem_start);
137
138#ifdef CONFIG_BLK_DEV_INITRD
139 if (initrd_start)
140 memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
141#endif
142
143 early_init_fdt_reserve_self();
144 early_init_fdt_scan_reserved_mem();
145
146 memblock_dump_all();
147
148 /*----------------- node/zones setup --------------------------*/
149 memset(zones_size, 0, sizeof(zones_size));
150 memset(zones_holes, 0, sizeof(zones_holes));
151
152 zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn;
153 zones_holes[ZONE_NORMAL] = 0;
154
155 /*
156 * We can't use the helper free_area_init(zones[]) because it uses
157 * PAGE_OFFSET to compute the @min_low_pfn which would be wrong
158 * when our kernel doesn't start at PAGE_OFFSET, i.e.
159 * PAGE_OFFSET != CONFIG_LINUX_LINK_BASE
160 */
161 free_area_init_node(0, /* node-id */
162 zones_size, /* num pages per zone */
163 min_low_pfn, /* first pfn of node */
164 zones_holes); /* holes */
165
166#ifdef CONFIG_HIGHMEM
167 /*
168 * Populate a new node with highmem
169 *
170 * On ARC (w/o PAE) HIGHMEM addresses are actually smaller (0 based)
171 * than addresses in normal ala low memory (0x8000_0000 based).
172 * Even with PAE, the huge peripheral space hole would waste a lot of
173 * mem with single mem_map[]. This warrants a mem_map per region design.
174 * Thus HIGHMEM on ARC is imlemented with DISCONTIGMEM.
175 *
176 * DISCONTIGMEM in turns requires multiple nodes. node 0 above is
177 * populated with normal memory zone while node 1 only has highmem
178 */
179 node_set_online(1);
180
181 min_high_pfn = PFN_DOWN(high_mem_start);
182 max_high_pfn = PFN_DOWN(high_mem_start + high_mem_sz);
183
184 zones_size[ZONE_NORMAL] = 0;
185 zones_holes[ZONE_NORMAL] = 0;
186
187 zones_size[ZONE_HIGHMEM] = max_high_pfn - min_high_pfn;
188 zones_holes[ZONE_HIGHMEM] = 0;
189
190 free_area_init_node(1, /* node-id */
191 zones_size, /* num pages per zone */
192 min_high_pfn, /* first pfn of node */
193 zones_holes); /* holes */
194
195 high_memory = (void *)(min_high_pfn << PAGE_SHIFT);
196 kmap_init();
197#endif
198}
199
200/*
201 * mem_init - initializes memory
202 *
203 * Frees up bootmem
204 * Calculates and displays memory available/used
205 */
206void __init mem_init(void)
207{
208#ifdef CONFIG_HIGHMEM
209 unsigned long tmp;
210
211 reset_all_zones_managed_pages();
212 for (tmp = min_high_pfn; tmp < max_high_pfn; tmp++)
213 free_highmem_page(pfn_to_page(tmp));
214#endif
215
216 free_all_bootmem();
217 mem_init_print_info(NULL);
218}
219
220/*
221 * free_initmem: Free all the __init memory.
222 */
223void __init_refok free_initmem(void)
224{
225 free_initmem_default(-1);
226}
227
228#ifdef CONFIG_BLK_DEV_INITRD
229void __init free_initrd_mem(unsigned long start, unsigned long end)
230{
231 free_reserved_area((void *)start, (void *)end, -1, "initrd");
232}
233#endif