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
 43long __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 */
 49static 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}
 58early_param("mem", setup_mem_sz);
 59
 60void __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
 83static 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}
 97early_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 */
106void __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 */
211void __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 */
228void __ref free_initmem(void)
229{
230	free_initmem_default(-1);
231}
232
233#ifdef CONFIG_BLK_DEV_INITRD
234void __init free_initrd_mem(unsigned long start, unsigned long end)
235{
236	free_reserved_area((void *)start, (void *)end, -1, "initrd");
237}
238#endif

  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