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Diffstat (limited to 'arch/ia64/mm/contig.c')
| -rw-r--r-- | arch/ia64/mm/contig.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/arch/ia64/mm/contig.c b/arch/ia64/mm/contig.c new file mode 100644 index 000000000..1e9eaa107 --- /dev/null +++ b/arch/ia64/mm/contig.c @@ -0,0 +1,208 @@ +/* + * 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/efi.h> +#include <linux/memblock.h> +#include <linux/mm.h> +#include <linux/nmi.h> +#include <linux/swap.h> +#include <linux/sizes.h> + +#include <asm/efi.h> +#include <asm/meminit.h> +#include <asm/sections.h> +#include <asm/mca.h> + +/* physical address where the bootmem map is located */ +unsigned long bootmap_start; + +#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 __init void +alloc_per_cpu_data(void) +{ + size_t size = PERCPU_PAGE_SIZE * num_possible_cpus(); + + cpu_data = memblock_alloc_from(size, PERCPU_PAGE_SIZE, + __pa(MAX_DMA_ADDRESS)); + if (!cpu_data) + panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n", + __func__, size, 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; + + 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; + + pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]); + 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) +{ + 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; + + memblock_add_node(0, PFN_PHYS(max_low_pfn), 0, MEMBLOCK_NONE); + + find_initrd(); + + alloc_per_cpu_data(); +} + +static int __init find_largest_hole(u64 start, u64 end, void *arg) +{ + u64 *max_gap = arg; + + static u64 last_end = PAGE_OFFSET; + + /* NOTE: this algorithm assumes efi memmap table is ordered */ + + if (*max_gap < (start - last_end)) + *max_gap = start - last_end; + last_end = end; + return 0; +} + +static void __init verify_gap_absence(void) +{ + unsigned long max_gap; + + /* Forbid FLATMEM if hole is > than 1G */ + efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); + if (max_gap >= SZ_1G) + panic("Cannot use FLATMEM with %ldMB hole\n" + "Please switch over to SPARSEMEM\n", + (max_gap >> 20)); +} + +/* + * 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)); + max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT; + max_zone_pfns[ZONE_DMA32] = max_dma; + max_zone_pfns[ZONE_NORMAL] = max_low_pfn; + + verify_gap_absence(); + + free_area_init(max_zone_pfns); + zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page)); +} |