/*
 * 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));
}