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>
29 #include <linux/dma-contiguous.h>
31 #include <asm/bootparam.h>
33 #include <asm/sections.h>
34 #include <asm/sysmem.h>
37 * Initialize the bootmem system and give it all low memory we have available.
40 void __init bootmem_init(void)
42 /* Reserve all memory below PHYS_OFFSET, as memory
43 * accounting doesn't work for pages below that address.
45 * If PHYS_OFFSET is zero reserve page at address 0:
46 * successfull allocations should never return NULL.
49 memblock_reserve(0, PHYS_OFFSET);
51 memblock_reserve(0, 1);
53 early_init_fdt_scan_reserved_mem();
55 if (!memblock_phys_mem_size())
56 panic("No memory found!\n");
58 min_low_pfn = PFN_UP(memblock_start_of_DRAM());
59 min_low_pfn = max(min_low_pfn, PFN_UP(PHYS_OFFSET));
60 max_pfn = PFN_DOWN(memblock_end_of_DRAM());
61 max_low_pfn = min(max_pfn, MAX_LOW_PFN);
63 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
64 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
70 void __init zones_init(void)
72 /* All pages are DMA-able, so we put them all in the DMA zone. */
73 unsigned long zones_size[MAX_NR_ZONES] = {
74 [ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET,
76 [ZONE_HIGHMEM] = max_pfn - max_low_pfn,
79 free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL);
83 * Initialize memory pages.
86 void __init mem_init(void)
91 reset_all_zones_managed_pages();
92 for (tmp = max_low_pfn; tmp < max_pfn; tmp++)
93 free_highmem_page(pfn_to_page(tmp));
96 max_mapnr = max_pfn - ARCH_PFN_OFFSET;
97 high_memory = (void *)__va(max_low_pfn << PAGE_SHIFT);
101 mem_init_print_info(NULL);
102 pr_info("virtual kernel memory layout:\n"
104 " kasan : 0x%08lx - 0x%08lx (%5lu MB)\n"
107 " vmalloc : 0x%08lx - 0x%08lx (%5lu MB)\n"
109 #ifdef CONFIG_HIGHMEM
110 " pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n"
111 " fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n"
113 " lowmem : 0x%08lx - 0x%08lx (%5lu MB)\n"
114 " .text : 0x%08lx - 0x%08lx (%5lu kB)\n"
115 " .rodata : 0x%08lx - 0x%08lx (%5lu kB)\n"
116 " .data : 0x%08lx - 0x%08lx (%5lu kB)\n"
117 " .init : 0x%08lx - 0x%08lx (%5lu kB)\n"
118 " .bss : 0x%08lx - 0x%08lx (%5lu kB)\n",
120 KASAN_SHADOW_START, KASAN_SHADOW_START + KASAN_SHADOW_SIZE,
121 KASAN_SHADOW_SIZE >> 20,
124 VMALLOC_START, VMALLOC_END,
125 (VMALLOC_END - VMALLOC_START) >> 20,
126 #ifdef CONFIG_HIGHMEM
127 PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE,
128 (LAST_PKMAP*PAGE_SIZE) >> 10,
129 FIXADDR_START, FIXADDR_TOP,
130 (FIXADDR_TOP - FIXADDR_START) >> 10,
132 PAGE_OFFSET, PAGE_OFFSET +
133 (max_low_pfn - min_low_pfn) * PAGE_SIZE,
135 min_low_pfn * PAGE_SIZE, max_low_pfn * PAGE_SIZE,
137 ((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20,
138 (unsigned long)_text, (unsigned long)_etext,
139 (unsigned long)(_etext - _text) >> 10,
140 (unsigned long)__start_rodata, (unsigned long)_sdata,
141 (unsigned long)(_sdata - __start_rodata) >> 10,
142 (unsigned long)_sdata, (unsigned long)_edata,
143 (unsigned long)(_edata - _sdata) >> 10,
144 (unsigned long)__init_begin, (unsigned long)__init_end,
145 (unsigned long)(__init_end - __init_begin) >> 10,
146 (unsigned long)__bss_start, (unsigned long)__bss_stop,
147 (unsigned long)(__bss_stop - __bss_start) >> 10);
150 #ifdef CONFIG_BLK_DEV_INITRD
151 extern int initrd_is_mapped;
153 void free_initrd_mem(unsigned long start, unsigned long end)
155 if (initrd_is_mapped)
156 free_reserved_area((void *)start, (void *)end, -1, "initrd");
160 void free_initmem(void)
162 free_initmem_default(-1);
165 static void __init parse_memmap_one(char *p)
168 unsigned long start_at, mem_size;
174 mem_size = memparse(p, &p);
180 start_at = memparse(p + 1, &p);
181 memblock_add(start_at, mem_size);
185 start_at = memparse(p + 1, &p);
186 memblock_reserve(start_at, mem_size);
190 memblock_reserve(mem_size, -mem_size);
194 pr_warn("Unrecognized memmap syntax: %s\n", p);
199 static int __init parse_memmap_opt(char *str)
202 char *k = strchr(str, ',');
207 parse_memmap_one(str);
213 early_param("memmap", parse_memmap_opt);