+++ /dev/null
-/*
- * 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));
-}
git.samba.org / sfrench / cifs-2.6.git / blobdiff