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