1/*
  2 * This file is subject to the terms and conditions of the GNU General Public
  3 * License.  See the file "COPYING" in the main directory of this archive
  4 * for more details.
  5 *
  6 * Copyright (C) 1998-2003 Hewlett-Packard Co
  7 *	David Mosberger-Tang <davidm@hpl.hp.com>
  8 *	Stephane Eranian <eranian@hpl.hp.com>
  9 * Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com>
 10 * Copyright (C) 1999 VA Linux Systems
 11 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
 12 * Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved.
 13 *
 14 * Routines used by ia64 machines with contiguous (or virtually contiguous)
 15 * memory.
 16 */
 17#include <linux/bootmem.h>
 18#include <linux/efi.h>
 19#include <linux/memblock.h>
 20#include <linux/mm.h>
 21#include <linux/nmi.h>
 22#include <linux/swap.h>
 23
 24#include <asm/meminit.h>
 25#include <asm/pgalloc.h>
 26#include <asm/pgtable.h>
 27#include <asm/sections.h>
 28#include <asm/mca.h>
 29
 30#ifdef CONFIG_VIRTUAL_MEM_MAP
 31static unsigned long max_gap;
 32#endif
 33
 34/* physical address where the bootmem map is located */
 35unsigned long bootmap_start;
 36
 37/**
 38 * find_bootmap_location - callback to find a memory area for the bootmap
 39 * @start: start of region
 40 * @end: end of region
 41 * @arg: unused callback data
 42 *
 43 * Find a place to put the bootmap and return its starting address in
 44 * bootmap_start.  This address must be page-aligned.
 45 */
 46static int __init
 47find_bootmap_location (u64 start, u64 end, void *arg)
 48{
 49	u64 needed = *(unsigned long *)arg;
 50	u64 range_start, range_end, free_start;
 51	int i;
 52
 53#if IGNORE_PFN0
 54	if (start == PAGE_OFFSET) {
 55		start += PAGE_SIZE;
 56		if (start >= end)
 57			return 0;
 58	}
 59#endif
 60
 61	free_start = PAGE_OFFSET;
 62
 63	for (i = 0; i < num_rsvd_regions; i++) {
 64		range_start = max(start, free_start);
 65		range_end   = min(end, rsvd_region[i].start & PAGE_MASK);
 66
 67		free_start = PAGE_ALIGN(rsvd_region[i].end);
 68
 69		if (range_end <= range_start)
 70			continue; /* skip over empty range */
 71
 72		if (range_end - range_start >= needed) {
 73			bootmap_start = __pa(range_start);
 74			return -1;	/* done */
 75		}
 76
 77		/* nothing more available in this segment */
 78		if (range_end == end)
 79			return 0;
 80	}
 81	return 0;
 82}
 83
 84#ifdef CONFIG_SMP
 85static void *cpu_data;
 86/**
 87 * per_cpu_init - setup per-cpu variables
 88 *
 89 * Allocate and setup per-cpu data areas.
 90 */
 91void *per_cpu_init(void)
 92{
 93	static bool first_time = true;
 94	void *cpu0_data = __cpu0_per_cpu;
 95	unsigned int cpu;
 96
 97	if (!first_time)
 98		goto skip;
 99	first_time = false;
100
101	/*
102	 * get_free_pages() cannot be used before cpu_init() done.
103	 * BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs
104	 * to avoid that AP calls get_zeroed_page().
105	 */
106	for_each_possible_cpu(cpu) {
107		void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start;
108
109		memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start);
110		__per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start;
111		per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
112
113		/*
114		 * percpu area for cpu0 is moved from the __init area
115		 * which is setup by head.S and used till this point.
116		 * Update ar.k3.  This move is ensures that percpu
117		 * area for cpu0 is on the correct node and its
118		 * virtual address isn't insanely far from other
119		 * percpu areas which is important for congruent
120		 * percpu allocator.
121		 */
122		if (cpu == 0)
123			ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) -
124				    (unsigned long)__per_cpu_start);
125
126		cpu_data += PERCPU_PAGE_SIZE;
127	}
128skip:
129	return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
130}
131
132static inline void
133alloc_per_cpu_data(void)
134{
135	cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * num_possible_cpus(),
136				   PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
137}
138
139/**
140 * setup_per_cpu_areas - setup percpu areas
141 *
142 * Arch code has already allocated and initialized percpu areas.  All
143 * this function has to do is to teach the determined layout to the
144 * dynamic percpu allocator, which happens to be more complex than
145 * creating whole new ones using helpers.
146 */
147void __init
148setup_per_cpu_areas(void)
149{
150	struct pcpu_alloc_info *ai;
151	struct pcpu_group_info *gi;
152	unsigned int cpu;
153	ssize_t static_size, reserved_size, dyn_size;
154	int rc;
155
156	ai = pcpu_alloc_alloc_info(1, num_possible_cpus());
157	if (!ai)
158		panic("failed to allocate pcpu_alloc_info");
159	gi = &ai->groups[0];
160
161	/* units are assigned consecutively to possible cpus */
162	for_each_possible_cpu(cpu)
163		gi->cpu_map[gi->nr_units++] = cpu;
164
165	/* set parameters */
166	static_size = __per_cpu_end - __per_cpu_start;
167	reserved_size = PERCPU_MODULE_RESERVE;
168	dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size;
169	if (dyn_size < 0)
170		panic("percpu area overflow static=%zd reserved=%zd\n",
171		      static_size, reserved_size);
172
173	ai->static_size		= static_size;
174	ai->reserved_size	= reserved_size;
175	ai->dyn_size		= dyn_size;
176	ai->unit_size		= PERCPU_PAGE_SIZE;
177	ai->atom_size		= PAGE_SIZE;
178	ai->alloc_size		= PERCPU_PAGE_SIZE;
179
180	rc = pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
181	if (rc)
182		panic("failed to setup percpu area (err=%d)", rc);
183
184	pcpu_free_alloc_info(ai);
185}
186#else
187#define alloc_per_cpu_data() do { } while (0)
188#endif /* CONFIG_SMP */
189
190/**
191 * find_memory - setup memory map
192 *
193 * Walk the EFI memory map and find usable memory for the system, taking
194 * into account reserved areas.
195 */
196void __init
197find_memory (void)
198{
199	unsigned long bootmap_size;
200
201	reserve_memory();
202
203	/* first find highest page frame number */
204	min_low_pfn = ~0UL;
205	max_low_pfn = 0;
206	efi_memmap_walk(find_max_min_low_pfn, NULL);
207	max_pfn = max_low_pfn;
208	/* how many bytes to cover all the pages */
209	bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
210
211	/* look for a location to hold the bootmap */
212	bootmap_start = ~0UL;
213	efi_memmap_walk(find_bootmap_location, &bootmap_size);
214	if (bootmap_start == ~0UL)
215		panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
216
217	bootmap_size = init_bootmem_node(NODE_DATA(0),
218			(bootmap_start >> PAGE_SHIFT), 0, max_pfn);
219
220	/* Free all available memory, then mark bootmem-map as being in use. */
221	efi_memmap_walk(filter_rsvd_memory, free_bootmem);
222	reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT);
223
224	find_initrd();
225
226	alloc_per_cpu_data();
227}
228
229/*
230 * Set up the page tables.
231 */
232
233void __init
234paging_init (void)
235{
236	unsigned long max_dma;
237	unsigned long max_zone_pfns[MAX_NR_ZONES];
238
239	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
240#ifdef CONFIG_ZONE_DMA32
241	max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
242	max_zone_pfns[ZONE_DMA32] = max_dma;
243#endif
244	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
245
246#ifdef CONFIG_VIRTUAL_MEM_MAP
247	efi_memmap_walk(filter_memory, register_active_ranges);
248	efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
249	if (max_gap < LARGE_GAP) {
250		vmem_map = (struct page *) 0;
251		free_area_init_nodes(max_zone_pfns);
252	} else {
253		unsigned long map_size;
254
255		/* allocate virtual_mem_map */
256
257		map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
258			sizeof(struct page));
259		VMALLOC_END -= map_size;
260		vmem_map = (struct page *) VMALLOC_END;
261		efi_memmap_walk(create_mem_map_page_table, NULL);
262
263		/*
264		 * alloc_node_mem_map makes an adjustment for mem_map
265		 * which isn't compatible with vmem_map.
266		 */
267		NODE_DATA(0)->node_mem_map = vmem_map +
268			find_min_pfn_with_active_regions();
269		free_area_init_nodes(max_zone_pfns);
270
271		printk("Virtual mem_map starts at 0x%p\n", mem_map);
272	}
273#else /* !CONFIG_VIRTUAL_MEM_MAP */
274	memblock_add_node(0, PFN_PHYS(max_low_pfn), 0);
275	free_area_init_nodes(max_zone_pfns);
276#endif /* !CONFIG_VIRTUAL_MEM_MAP */
277	zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
278}