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Linux/arch/arc/mm/init.c

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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/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 
 25 pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
 26 char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE);
 27 EXPORT_SYMBOL(empty_zero_page);
 28 
 29 static const unsigned long low_mem_start = CONFIG_LINUX_LINK_BASE;
 30 static unsigned long low_mem_sz;
 31 
 32 #ifdef CONFIG_HIGHMEM
 33 static unsigned long min_high_pfn, max_high_pfn;
 34 static u64 high_mem_start;
 35 static u64 high_mem_sz;
 36 #endif
 37 
 38 #ifdef CONFIG_DISCONTIGMEM
 39 struct pglist_data node_data[MAX_NUMNODES] __read_mostly;
 40 EXPORT_SYMBOL(node_data);
 41 #endif
 42 
 43 long __init arc_get_mem_sz(void)
 44 {
 45         return low_mem_sz;
 46 }
 47 
 48 /* User can over-ride above with "mem=nnn[KkMm]" in cmdline */
 49 static int __init setup_mem_sz(char *str)
 50 {
 51         low_mem_sz = memparse(str, NULL) & PAGE_MASK;
 52 
 53         /* early console might not be setup yet - it will show up later */
 54         pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(low_mem_sz));
 55 
 56         return 0;
 57 }
 58 early_param("mem", setup_mem_sz);
 59 
 60 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 61 {
 62         int in_use = 0;
 63 
 64         if (!low_mem_sz) {
 65                 if (base != low_mem_start)
 66                         panic("CONFIG_LINUX_LINK_BASE != DT memory { }");
 67 
 68                 low_mem_sz = size;
 69                 in_use = 1;
 70         } else {
 71 #ifdef CONFIG_HIGHMEM
 72                 high_mem_start = base;
 73                 high_mem_sz = size;
 74                 in_use = 1;
 75 #endif
 76         }
 77 
 78         pr_info("Memory @ %llx [%lldM] %s\n",
 79                 base, TO_MB(size), !in_use ? "Not used":"");
 80 }
 81 
 82 #ifdef CONFIG_BLK_DEV_INITRD
 83 static int __init early_initrd(char *p)
 84 {
 85         unsigned long start, size;
 86         char *endp;
 87 
 88         start = memparse(p, &endp);
 89         if (*endp == ',') {
 90                 size = memparse(endp + 1, NULL);
 91 
 92                 initrd_start = (unsigned long)__va(start);
 93                 initrd_end = (unsigned long)__va(start + size);
 94         }
 95         return 0;
 96 }
 97 early_param("initrd", early_initrd);
 98 #endif
 99 
100 /*
101  * First memory setup routine called from setup_arch()
102  * 1. setup swapper's mm @init_mm
103  * 2. Count the pages we have and setup bootmem allocator
104  * 3. zone setup
105  */
106 void __init setup_arch_memory(void)
107 {
108         unsigned long zones_size[MAX_NR_ZONES];
109         unsigned long zones_holes[MAX_NR_ZONES];
110 
111         init_mm.start_code = (unsigned long)_text;
112         init_mm.end_code = (unsigned long)_etext;
113         init_mm.end_data = (unsigned long)_edata;
114         init_mm.brk = (unsigned long)_end;
115 
116         /* first page of system - kernel .vector starts here */
117         min_low_pfn = ARCH_PFN_OFFSET;
118 
119         /* Last usable page of low mem */
120         max_low_pfn = max_pfn = PFN_DOWN(low_mem_start + low_mem_sz);
121 
122 #ifdef CONFIG_FLATMEM
123         /* pfn_valid() uses this */
124         max_mapnr = max_low_pfn - min_low_pfn;
125 #endif
126 
127         /*------------- bootmem allocator setup -----------------------*/
128 
129         /*
130          * seed the bootmem allocator after any DT memory node parsing or
131          * "mem=xxx" cmdline overrides have potentially updated @arc_mem_sz
132          *
133          * Only low mem is added, otherwise we have crashes when allocating
134          * mem_map[] itself. NO_BOOTMEM allocates mem_map[] at the end of
135          * avail memory, ending in highmem with a > 32-bit address. However
136          * it then tries to memset it with a truncaed 32-bit handle, causing
137          * the crash
138          */
139 
140         memblock_add_node(low_mem_start, low_mem_sz, 0);
141         memblock_reserve(low_mem_start, __pa(_end) - low_mem_start);
142 
143 #ifdef CONFIG_BLK_DEV_INITRD
144         if (initrd_start)
145                 memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
146 #endif
147 
148         early_init_fdt_reserve_self();
149         early_init_fdt_scan_reserved_mem();
150 
151         memblock_dump_all();
152 
153         /*----------------- node/zones setup --------------------------*/
154         memset(zones_size, 0, sizeof(zones_size));
155         memset(zones_holes, 0, sizeof(zones_holes));
156 
157         zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn;
158         zones_holes[ZONE_NORMAL] = 0;
159 
160         /*
161          * We can't use the helper free_area_init(zones[]) because it uses
162          * PAGE_OFFSET to compute the @min_low_pfn which would be wrong
163          * when our kernel doesn't start at PAGE_OFFSET, i.e.
164          * PAGE_OFFSET != CONFIG_LINUX_LINK_BASE
165          */
166         free_area_init_node(0,                  /* node-id */
167                             zones_size,         /* num pages per zone */
168                             min_low_pfn,        /* first pfn of node */
169                             zones_holes);       /* holes */
170 
171 #ifdef CONFIG_HIGHMEM
172         /*
173          * Populate a new node with highmem
174          *
175          * On ARC (w/o PAE) HIGHMEM addresses are actually smaller (0 based)
176          * than addresses in normal ala low memory (0x8000_0000 based).
177          * Even with PAE, the huge peripheral space hole would waste a lot of
178          * mem with single mem_map[]. This warrants a mem_map per region design.
179          * Thus HIGHMEM on ARC is imlemented with DISCONTIGMEM.
180          *
181          * DISCONTIGMEM in turns requires multiple nodes. node 0 above is
182          * populated with normal memory zone while node 1 only has highmem
183          */
184         node_set_online(1);
185 
186         min_high_pfn = PFN_DOWN(high_mem_start);
187         max_high_pfn = PFN_DOWN(high_mem_start + high_mem_sz);
188 
189         zones_size[ZONE_NORMAL] = 0;
190         zones_holes[ZONE_NORMAL] = 0;
191 
192         zones_size[ZONE_HIGHMEM] = max_high_pfn - min_high_pfn;
193         zones_holes[ZONE_HIGHMEM] = 0;
194 
195         free_area_init_node(1,                  /* node-id */
196                             zones_size,         /* num pages per zone */
197                             min_high_pfn,       /* first pfn of node */
198                             zones_holes);       /* holes */
199 
200         high_memory = (void *)(min_high_pfn << PAGE_SHIFT);
201         kmap_init();
202 #endif
203 }
204 
205 /*
206  * mem_init - initializes memory
207  *
208  * Frees up bootmem
209  * Calculates and displays memory available/used
210  */
211 void __init mem_init(void)
212 {
213 #ifdef CONFIG_HIGHMEM
214         unsigned long tmp;
215 
216         reset_all_zones_managed_pages();
217         for (tmp = min_high_pfn; tmp < max_high_pfn; tmp++)
218                 free_highmem_page(pfn_to_page(tmp));
219 #endif
220 
221         free_all_bootmem();
222         mem_init_print_info(NULL);
223 }
224 
225 /*
226  * free_initmem: Free all the __init memory.
227  */
228 void __ref free_initmem(void)
229 {
230         free_initmem_default(-1);
231 }
232 
233 #ifdef CONFIG_BLK_DEV_INITRD
234 void __init free_initrd_mem(unsigned long start, unsigned long end)
235 {
236         free_reserved_area((void *)start, (void *)end, -1, "initrd");
237 }
238 #endif
239 

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