/*
* 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));
}