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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/swap.h>
17#include <linux/module.h>
18#include <asm/page.h>
19#include <asm/pgalloc.h>
20#include <asm/sections.h>
21#include <asm/arcregs.h>
22
23pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
24char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE);
25EXPORT_SYMBOL(empty_zero_page);
26
27/* Default tot mem from .config */
28static unsigned long arc_mem_sz = 0x20000000; /* some default */
29
30/* User can over-ride above with "mem=nnn[KkMm]" in cmdline */
31static int __init setup_mem_sz(char *str)
32{
33 arc_mem_sz = memparse(str, NULL) & PAGE_MASK;
34
35 /* early console might not be setup yet - it will show up later */
36 pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(arc_mem_sz));
37
38 return 0;
39}
40early_param("mem", setup_mem_sz);
41
42void __init early_init_dt_add_memory_arch(u64 base, u64 size)
43{
44 arc_mem_sz = size & PAGE_MASK;
45 pr_info("Memory size set via devicetree %ldM\n", TO_MB(arc_mem_sz));
46}
47
48#ifdef CONFIG_BLK_DEV_INITRD
49static int __init early_initrd(char *p)
50{
51 unsigned long start, size;
52 char *endp;
53
54 start = memparse(p, &endp);
55 if (*endp == ',') {
56 size = memparse(endp + 1, NULL);
57
58 initrd_start = (unsigned long)__va(start);
59 initrd_end = (unsigned long)__va(start + size);
60 }
61 return 0;
62}
63early_param("initrd", early_initrd);
64#endif
65
66/*
67 * First memory setup routine called from setup_arch()
68 * 1. setup swapper's mm @init_mm
69 * 2. Count the pages we have and setup bootmem allocator
70 * 3. zone setup
71 */
72void __init setup_arch_memory(void)
73{
74 unsigned long zones_size[MAX_NR_ZONES] = { 0, 0 };
75 unsigned long end_mem = CONFIG_LINUX_LINK_BASE + arc_mem_sz;
76
77 init_mm.start_code = (unsigned long)_text;
78 init_mm.end_code = (unsigned long)_etext;
79 init_mm.end_data = (unsigned long)_edata;
80 init_mm.brk = (unsigned long)_end;
81
82 /*
83 * We do it here, so that memory is correctly instantiated
84 * even if "mem=xxx" cmline over-ride is given and/or
85 * DT has memory node. Each causes an update to @arc_mem_sz
86 * and we finally add memory one here
87 */
88 memblock_add(CONFIG_LINUX_LINK_BASE, arc_mem_sz);
89
90 /*------------- externs in mm need setting up ---------------*/
91
92 /* first page of system - kernel .vector starts here */
93 min_low_pfn = PFN_DOWN(CONFIG_LINUX_LINK_BASE);
94
95 /* Last usable page of low mem (no HIGHMEM yet for ARC port) */
96 max_low_pfn = max_pfn = PFN_DOWN(end_mem);
97
98 max_mapnr = max_low_pfn - min_low_pfn;
99
100 /*------------- reserve kernel image -----------------------*/
101 memblock_reserve(CONFIG_LINUX_LINK_BASE,
102 __pa(_end) - CONFIG_LINUX_LINK_BASE);
103
104#ifdef CONFIG_BLK_DEV_INITRD
105 /*------------- reserve initrd image -----------------------*/
106 if (initrd_start)
107 memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
108#endif
109
110 memblock_dump_all();
111
112 /*-------------- node setup --------------------------------*/
113 memset(zones_size, 0, sizeof(zones_size));
114 zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn;
115
116 /*
117 * We can't use the helper free_area_init(zones[]) because it uses
118 * PAGE_OFFSET to compute the @min_low_pfn which would be wrong
119 * when our kernel doesn't start at PAGE_OFFSET, i.e.
120 * PAGE_OFFSET != CONFIG_LINUX_LINK_BASE
121 */
122 free_area_init_node(0, /* node-id */
123 zones_size, /* num pages per zone */
124 min_low_pfn, /* first pfn of node */
125 NULL); /* NO holes */
126}
127
128/*
129 * mem_init - initializes memory
130 *
131 * Frees up bootmem
132 * Calculates and displays memory available/used
133 */
134void __init mem_init(void)
135{
136 high_memory = (void *)(CONFIG_LINUX_LINK_BASE + arc_mem_sz);
137 free_all_bootmem();
138 mem_init_print_info(NULL);
139}
140
141/*
142 * free_initmem: Free all the __init memory.
143 */
144void __init_refok free_initmem(void)
145{
146 free_initmem_default(-1);
147}
148
149#ifdef CONFIG_BLK_DEV_INITRD
150void __init free_initrd_mem(unsigned long start, unsigned long end)
151{
152 free_reserved_area((void *)start, (void *)end, -1, "initrd");
153}
154#endif
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/pgalloc.h>
18#include <asm/sections.h>
19#include <asm/arcregs.h>
20
21pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
22char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE);
23EXPORT_SYMBOL(empty_zero_page);
24
25static const unsigned long low_mem_start = CONFIG_LINUX_RAM_BASE;
26static unsigned long low_mem_sz;
27
28#ifdef CONFIG_HIGHMEM
29static unsigned long min_high_pfn, max_high_pfn;
30static u64 high_mem_start;
31static u64 high_mem_sz;
32#endif
33
34#ifdef CONFIG_DISCONTIGMEM
35struct pglist_data node_data[MAX_NUMNODES] __read_mostly;
36EXPORT_SYMBOL(node_data);
37#endif
38
39long __init arc_get_mem_sz(void)
40{
41 return low_mem_sz;
42}
43
44/* User can over-ride above with "mem=nnn[KkMm]" in cmdline */
45static int __init setup_mem_sz(char *str)
46{
47 low_mem_sz = memparse(str, NULL) & PAGE_MASK;
48
49 /* early console might not be setup yet - it will show up later */
50 pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(low_mem_sz));
51
52 return 0;
53}
54early_param("mem", setup_mem_sz);
55
56void __init early_init_dt_add_memory_arch(u64 base, u64 size)
57{
58 int in_use = 0;
59
60 if (!low_mem_sz) {
61 if (base != low_mem_start)
62 panic("CONFIG_LINUX_RAM_BASE != DT memory { }");
63
64 low_mem_sz = size;
65 in_use = 1;
66 } else {
67#ifdef CONFIG_HIGHMEM
68 high_mem_start = base;
69 high_mem_sz = size;
70 in_use = 1;
71#endif
72 }
73
74 pr_info("Memory @ %llx [%lldM] %s\n",
75 base, TO_MB(size), !in_use ? "Not used":"");
76}
77
78/*
79 * First memory setup routine called from setup_arch()
80 * 1. setup swapper's mm @init_mm
81 * 2. Count the pages we have and setup bootmem allocator
82 * 3. zone setup
83 */
84void __init setup_arch_memory(void)
85{
86 unsigned long zones_size[MAX_NR_ZONES];
87 unsigned long zones_holes[MAX_NR_ZONES];
88
89 init_mm.start_code = (unsigned long)_text;
90 init_mm.end_code = (unsigned long)_etext;
91 init_mm.end_data = (unsigned long)_edata;
92 init_mm.brk = (unsigned long)_end;
93
94 /* first page of system - kernel .vector starts here */
95 min_low_pfn = ARCH_PFN_OFFSET;
96
97 /* Last usable page of low mem */
98 max_low_pfn = max_pfn = PFN_DOWN(low_mem_start + low_mem_sz);
99
100#ifdef CONFIG_FLATMEM
101 /* pfn_valid() uses this */
102 max_mapnr = max_low_pfn - min_low_pfn;
103#endif
104
105 /*------------- bootmem allocator setup -----------------------*/
106
107 /*
108 * seed the bootmem allocator after any DT memory node parsing or
109 * "mem=xxx" cmdline overrides have potentially updated @arc_mem_sz
110 *
111 * Only low mem is added, otherwise we have crashes when allocating
112 * mem_map[] itself. NO_BOOTMEM allocates mem_map[] at the end of
113 * avail memory, ending in highmem with a > 32-bit address. However
114 * it then tries to memset it with a truncaed 32-bit handle, causing
115 * the crash
116 */
117
118 memblock_add_node(low_mem_start, low_mem_sz, 0);
119 memblock_reserve(CONFIG_LINUX_LINK_BASE,
120 __pa(_end) - CONFIG_LINUX_LINK_BASE);
121
122#ifdef CONFIG_BLK_DEV_INITRD
123 if (phys_initrd_size) {
124 memblock_reserve(phys_initrd_start, phys_initrd_size);
125 initrd_start = (unsigned long)__va(phys_initrd_start);
126 initrd_end = initrd_start + phys_initrd_size;
127 }
128#endif
129
130 early_init_fdt_reserve_self();
131 early_init_fdt_scan_reserved_mem();
132
133 memblock_dump_all();
134
135 /*----------------- node/zones setup --------------------------*/
136 memset(zones_size, 0, sizeof(zones_size));
137 memset(zones_holes, 0, sizeof(zones_holes));
138
139 zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn;
140 zones_holes[ZONE_NORMAL] = 0;
141
142 /*
143 * We can't use the helper free_area_init(zones[]) because it uses
144 * PAGE_OFFSET to compute the @min_low_pfn which would be wrong
145 * when our kernel doesn't start at PAGE_OFFSET, i.e.
146 * PAGE_OFFSET != CONFIG_LINUX_RAM_BASE
147 */
148 free_area_init_node(0, /* node-id */
149 zones_size, /* num pages per zone */
150 min_low_pfn, /* first pfn of node */
151 zones_holes); /* holes */
152
153#ifdef CONFIG_HIGHMEM
154 /*
155 * Populate a new node with highmem
156 *
157 * On ARC (w/o PAE) HIGHMEM addresses are actually smaller (0 based)
158 * than addresses in normal ala low memory (0x8000_0000 based).
159 * Even with PAE, the huge peripheral space hole would waste a lot of
160 * mem with single mem_map[]. This warrants a mem_map per region design.
161 * Thus HIGHMEM on ARC is imlemented with DISCONTIGMEM.
162 *
163 * DISCONTIGMEM in turns requires multiple nodes. node 0 above is
164 * populated with normal memory zone while node 1 only has highmem
165 */
166 node_set_online(1);
167
168 min_high_pfn = PFN_DOWN(high_mem_start);
169 max_high_pfn = PFN_DOWN(high_mem_start + high_mem_sz);
170
171 zones_size[ZONE_NORMAL] = 0;
172 zones_holes[ZONE_NORMAL] = 0;
173
174 zones_size[ZONE_HIGHMEM] = max_high_pfn - min_high_pfn;
175 zones_holes[ZONE_HIGHMEM] = 0;
176
177 free_area_init_node(1, /* node-id */
178 zones_size, /* num pages per zone */
179 min_high_pfn, /* first pfn of node */
180 zones_holes); /* holes */
181
182 high_memory = (void *)(min_high_pfn << PAGE_SHIFT);
183 kmap_init();
184#endif
185}
186
187/*
188 * mem_init - initializes memory
189 *
190 * Frees up bootmem
191 * Calculates and displays memory available/used
192 */
193void __init mem_init(void)
194{
195#ifdef CONFIG_HIGHMEM
196 unsigned long tmp;
197
198 reset_all_zones_managed_pages();
199 for (tmp = min_high_pfn; tmp < max_high_pfn; tmp++)
200 free_highmem_page(pfn_to_page(tmp));
201#endif
202
203 memblock_free_all();
204 mem_init_print_info(NULL);
205}