2 * arch/xtensa/mm/init.c
4 * Derived from MIPS, PPC.
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
10 * Copyright (C) 2001 - 2005 Tensilica Inc.
11 * Copyright (C) 2014 - 2016 Cadence Design Systems Inc.
13 * Chris Zankel <chris@zankel.net>
14 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
19 #include <linux/kernel.h>
20 #include <linux/errno.h>
21 #include <linux/bootmem.h>
22 #include <linux/gfp.h>
23 #include <linux/highmem.h>
24 #include <linux/swap.h>
25 #include <linux/mman.h>
26 #include <linux/nodemask.h>
28 #include <linux/of_fdt.h>
30 #include <asm/bootparam.h>
32 #include <asm/sections.h>
33 #include <asm/sysmem.h>
36 * Initialize the bootmem system and give it all low memory we have available.
39 void __init
bootmem_init(void)
41 /* Reserve all memory below PHYS_OFFSET, as memory
42 * accounting doesn't work for pages below that address.
44 * If PHYS_OFFSET is zero reserve page at address 0:
45 * successfull allocations should never return NULL.
48 memblock_reserve(0, PHYS_OFFSET
);
50 memblock_reserve(0, 1);
52 early_init_fdt_scan_reserved_mem();
54 if (!memblock_phys_mem_size())
55 panic("No memory found!\n");
57 min_low_pfn
= PFN_UP(memblock_start_of_DRAM());
58 min_low_pfn
= max(min_low_pfn
, PFN_UP(PHYS_OFFSET
));
59 max_pfn
= PFN_DOWN(memblock_end_of_DRAM());
60 max_low_pfn
= min(max_pfn
, MAX_LOW_PFN
);
62 memblock_set_current_limit(PFN_PHYS(max_low_pfn
));
68 void __init
zones_init(void)
70 /* All pages are DMA-able, so we put them all in the DMA zone. */
71 unsigned long zones_size
[MAX_NR_ZONES
] = {
72 [ZONE_DMA
] = max_low_pfn
- ARCH_PFN_OFFSET
,
74 [ZONE_HIGHMEM
] = max_pfn
- max_low_pfn
,
77 free_area_init_node(0, zones_size
, ARCH_PFN_OFFSET
, NULL
);
81 * Initialize memory pages.
84 void __init
mem_init(void)
89 reset_all_zones_managed_pages();
90 for (tmp
= max_low_pfn
; tmp
< max_pfn
; tmp
++)
91 free_highmem_page(pfn_to_page(tmp
));
94 max_mapnr
= max_pfn
- ARCH_PFN_OFFSET
;
95 high_memory
= (void *)__va(max_low_pfn
<< PAGE_SHIFT
);
99 mem_init_print_info(NULL
);
100 pr_info("virtual kernel memory layout:\n"
101 #ifdef CONFIG_HIGHMEM
102 " pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n"
103 " fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n"
106 " vmalloc : 0x%08lx - 0x%08lx (%5lu MB)\n"
108 " lowmem : 0x%08lx - 0x%08lx (%5lu MB)\n",
109 #ifdef CONFIG_HIGHMEM
110 PKMAP_BASE
, PKMAP_BASE
+ LAST_PKMAP
* PAGE_SIZE
,
111 (LAST_PKMAP
*PAGE_SIZE
) >> 10,
112 FIXADDR_START
, FIXADDR_TOP
,
113 (FIXADDR_TOP
- FIXADDR_START
) >> 10,
116 VMALLOC_START
, VMALLOC_END
,
117 (VMALLOC_END
- VMALLOC_START
) >> 20,
118 PAGE_OFFSET
, PAGE_OFFSET
+
119 (max_low_pfn
- min_low_pfn
) * PAGE_SIZE
,
121 min_low_pfn
* PAGE_SIZE
, max_low_pfn
* PAGE_SIZE
,
123 ((max_low_pfn
- min_low_pfn
) * PAGE_SIZE
) >> 20);
126 #ifdef CONFIG_BLK_DEV_INITRD
127 extern int initrd_is_mapped
;
129 void free_initrd_mem(unsigned long start
, unsigned long end
)
131 if (initrd_is_mapped
)
132 free_reserved_area((void *)start
, (void *)end
, -1, "initrd");
136 void free_initmem(void)
138 free_initmem_default(-1);
141 static void __init
parse_memmap_one(char *p
)
144 unsigned long start_at
, mem_size
;
150 mem_size
= memparse(p
, &p
);
156 start_at
= memparse(p
+ 1, &p
);
157 memblock_add(start_at
, mem_size
);
161 start_at
= memparse(p
+ 1, &p
);
162 memblock_reserve(start_at
, mem_size
);
166 memblock_reserve(mem_size
, -mem_size
);
170 pr_warn("Unrecognized memmap syntax: %s\n", p
);
175 static int __init
parse_memmap_opt(char *str
)
178 char *k
= strchr(str
, ',');
183 parse_memmap_one(str
);
189 early_param("memmap", parse_memmap_opt
);
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