123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278 |
- /*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1998-2003 Hewlett-Packard Co
- * David Mosberger-Tang <davidm@hpl.hp.com>
- * Stephane Eranian <eranian@hpl.hp.com>
- * Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com>
- * Copyright (C) 1999 VA Linux Systems
- * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
- * Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved.
- *
- * Routines used by ia64 machines with contiguous (or virtually contiguous)
- * memory.
- */
- #include <linux/bootmem.h>
- #include <linux/efi.h>
- #include <linux/memblock.h>
- #include <linux/mm.h>
- #include <linux/nmi.h>
- #include <linux/swap.h>
- #include <asm/meminit.h>
- #include <asm/pgalloc.h>
- #include <asm/pgtable.h>
- #include <asm/sections.h>
- #include <asm/mca.h>
- #ifdef CONFIG_VIRTUAL_MEM_MAP
- static unsigned long max_gap;
- #endif
- /* physical address where the bootmem map is located */
- unsigned long bootmap_start;
- /**
- * find_bootmap_location - callback to find a memory area for the bootmap
- * @start: start of region
- * @end: end of region
- * @arg: unused callback data
- *
- * Find a place to put the bootmap and return its starting address in
- * bootmap_start. This address must be page-aligned.
- */
- static int __init
- find_bootmap_location (u64 start, u64 end, void *arg)
- {
- u64 needed = *(unsigned long *)arg;
- u64 range_start, range_end, free_start;
- int i;
- #if IGNORE_PFN0
- if (start == PAGE_OFFSET) {
- start += PAGE_SIZE;
- if (start >= end)
- return 0;
- }
- #endif
- free_start = PAGE_OFFSET;
- for (i = 0; i < num_rsvd_regions; i++) {
- range_start = max(start, free_start);
- range_end = min(end, rsvd_region[i].start & PAGE_MASK);
- free_start = PAGE_ALIGN(rsvd_region[i].end);
- if (range_end <= range_start)
- continue; /* skip over empty range */
- if (range_end - range_start >= needed) {
- bootmap_start = __pa(range_start);
- return -1; /* done */
- }
- /* nothing more available in this segment */
- if (range_end == end)
- return 0;
- }
- return 0;
- }
- #ifdef CONFIG_SMP
- static void *cpu_data;
- /**
- * per_cpu_init - setup per-cpu variables
- *
- * Allocate and setup per-cpu data areas.
- */
- void *per_cpu_init(void)
- {
- static bool first_time = true;
- void *cpu0_data = __cpu0_per_cpu;
- unsigned int cpu;
- if (!first_time)
- goto skip;
- first_time = false;
- /*
- * get_free_pages() cannot be used before cpu_init() done.
- * BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs
- * to avoid that AP calls get_zeroed_page().
- */
- for_each_possible_cpu(cpu) {
- void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start;
- memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start);
- __per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start;
- per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
- /*
- * percpu area for cpu0 is moved from the __init area
- * which is setup by head.S and used till this point.
- * Update ar.k3. This move is ensures that percpu
- * area for cpu0 is on the correct node and its
- * virtual address isn't insanely far from other
- * percpu areas which is important for congruent
- * percpu allocator.
- */
- if (cpu == 0)
- ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) -
- (unsigned long)__per_cpu_start);
- cpu_data += PERCPU_PAGE_SIZE;
- }
- skip:
- return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
- }
- static inline void
- alloc_per_cpu_data(void)
- {
- cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * num_possible_cpus(),
- PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
- }
- /**
- * setup_per_cpu_areas - setup percpu areas
- *
- * Arch code has already allocated and initialized percpu areas. All
- * this function has to do is to teach the determined layout to the
- * dynamic percpu allocator, which happens to be more complex than
- * creating whole new ones using helpers.
- */
- void __init
- setup_per_cpu_areas(void)
- {
- struct pcpu_alloc_info *ai;
- struct pcpu_group_info *gi;
- unsigned int cpu;
- ssize_t static_size, reserved_size, dyn_size;
- int rc;
- ai = pcpu_alloc_alloc_info(1, num_possible_cpus());
- if (!ai)
- panic("failed to allocate pcpu_alloc_info");
- gi = &ai->groups[0];
- /* units are assigned consecutively to possible cpus */
- for_each_possible_cpu(cpu)
- gi->cpu_map[gi->nr_units++] = cpu;
- /* set parameters */
- static_size = __per_cpu_end - __per_cpu_start;
- reserved_size = PERCPU_MODULE_RESERVE;
- dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size;
- if (dyn_size < 0)
- panic("percpu area overflow static=%zd reserved=%zd\n",
- static_size, reserved_size);
- ai->static_size = static_size;
- ai->reserved_size = reserved_size;
- ai->dyn_size = dyn_size;
- ai->unit_size = PERCPU_PAGE_SIZE;
- ai->atom_size = PAGE_SIZE;
- ai->alloc_size = PERCPU_PAGE_SIZE;
- rc = pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
- if (rc)
- panic("failed to setup percpu area (err=%d)", rc);
- pcpu_free_alloc_info(ai);
- }
- #else
- #define alloc_per_cpu_data() do { } while (0)
- #endif /* CONFIG_SMP */
- /**
- * find_memory - setup memory map
- *
- * Walk the EFI memory map and find usable memory for the system, taking
- * into account reserved areas.
- */
- void __init
- find_memory (void)
- {
- unsigned long bootmap_size;
- reserve_memory();
- /* first find highest page frame number */
- min_low_pfn = ~0UL;
- max_low_pfn = 0;
- efi_memmap_walk(find_max_min_low_pfn, NULL);
- max_pfn = max_low_pfn;
- /* how many bytes to cover all the pages */
- bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
- /* look for a location to hold the bootmap */
- bootmap_start = ~0UL;
- efi_memmap_walk(find_bootmap_location, &bootmap_size);
- if (bootmap_start == ~0UL)
- panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
- bootmap_size = init_bootmem_node(NODE_DATA(0),
- (bootmap_start >> PAGE_SHIFT), 0, max_pfn);
- /* Free all available memory, then mark bootmem-map as being in use. */
- efi_memmap_walk(filter_rsvd_memory, free_bootmem);
- reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT);
- find_initrd();
- alloc_per_cpu_data();
- }
- /*
- * Set up the page tables.
- */
- void __init
- paging_init (void)
- {
- unsigned long max_dma;
- unsigned long max_zone_pfns[MAX_NR_ZONES];
- memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
- #ifdef CONFIG_ZONE_DMA
- max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
- max_zone_pfns[ZONE_DMA] = max_dma;
- #endif
- max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
- #ifdef CONFIG_VIRTUAL_MEM_MAP
- efi_memmap_walk(filter_memory, register_active_ranges);
- efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
- if (max_gap < LARGE_GAP) {
- vmem_map = (struct page *) 0;
- free_area_init_nodes(max_zone_pfns);
- } else {
- unsigned long map_size;
- /* allocate virtual_mem_map */
- map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
- sizeof(struct page));
- VMALLOC_END -= map_size;
- vmem_map = (struct page *) VMALLOC_END;
- efi_memmap_walk(create_mem_map_page_table, NULL);
- /*
- * alloc_node_mem_map makes an adjustment for mem_map
- * which isn't compatible with vmem_map.
- */
- NODE_DATA(0)->node_mem_map = vmem_map +
- find_min_pfn_with_active_regions();
- free_area_init_nodes(max_zone_pfns);
- printk("Virtual mem_map starts at 0x%p\n", mem_map);
- }
- #else /* !CONFIG_VIRTUAL_MEM_MAP */
- memblock_add_node(0, PFN_PHYS(max_low_pfn), 0);
- free_area_init_nodes(max_zone_pfns);
- #endif /* !CONFIG_VIRTUAL_MEM_MAP */
- zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
- }
|