cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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contig.c (5526B)


      1/*
      2 * This file is subject to the terms and conditions of the GNU General Public
      3 * License.  See the file "COPYING" in the main directory of this archive
      4 * for more details.
      5 *
      6 * Copyright (C) 1998-2003 Hewlett-Packard Co
      7 *	David Mosberger-Tang <davidm@hpl.hp.com>
      8 *	Stephane Eranian <eranian@hpl.hp.com>
      9 * Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com>
     10 * Copyright (C) 1999 VA Linux Systems
     11 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
     12 * Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved.
     13 *
     14 * Routines used by ia64 machines with contiguous (or virtually contiguous)
     15 * memory.
     16 */
     17#include <linux/efi.h>
     18#include <linux/memblock.h>
     19#include <linux/mm.h>
     20#include <linux/nmi.h>
     21#include <linux/swap.h>
     22#include <linux/sizes.h>
     23
     24#include <asm/efi.h>
     25#include <asm/meminit.h>
     26#include <asm/sections.h>
     27#include <asm/mca.h>
     28
     29/* physical address where the bootmem map is located */
     30unsigned long bootmap_start;
     31
     32#ifdef CONFIG_SMP
     33static void *cpu_data;
     34/**
     35 * per_cpu_init - setup per-cpu variables
     36 *
     37 * Allocate and setup per-cpu data areas.
     38 */
     39void *per_cpu_init(void)
     40{
     41	static bool first_time = true;
     42	void *cpu0_data = __cpu0_per_cpu;
     43	unsigned int cpu;
     44
     45	if (!first_time)
     46		goto skip;
     47	first_time = false;
     48
     49	/*
     50	 * get_free_pages() cannot be used before cpu_init() done.
     51	 * BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs
     52	 * to avoid that AP calls get_zeroed_page().
     53	 */
     54	for_each_possible_cpu(cpu) {
     55		void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start;
     56
     57		memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start);
     58		__per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start;
     59		per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
     60
     61		/*
     62		 * percpu area for cpu0 is moved from the __init area
     63		 * which is setup by head.S and used till this point.
     64		 * Update ar.k3.  This move is ensures that percpu
     65		 * area for cpu0 is on the correct node and its
     66		 * virtual address isn't insanely far from other
     67		 * percpu areas which is important for congruent
     68		 * percpu allocator.
     69		 */
     70		if (cpu == 0)
     71			ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) -
     72				    (unsigned long)__per_cpu_start);
     73
     74		cpu_data += PERCPU_PAGE_SIZE;
     75	}
     76skip:
     77	return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
     78}
     79
     80static inline void
     81alloc_per_cpu_data(void)
     82{
     83	size_t size = PERCPU_PAGE_SIZE * num_possible_cpus();
     84
     85	cpu_data = memblock_alloc_from(size, PERCPU_PAGE_SIZE,
     86				       __pa(MAX_DMA_ADDRESS));
     87	if (!cpu_data)
     88		panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
     89		      __func__, size, PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
     90}
     91
     92/**
     93 * setup_per_cpu_areas - setup percpu areas
     94 *
     95 * Arch code has already allocated and initialized percpu areas.  All
     96 * this function has to do is to teach the determined layout to the
     97 * dynamic percpu allocator, which happens to be more complex than
     98 * creating whole new ones using helpers.
     99 */
    100void __init
    101setup_per_cpu_areas(void)
    102{
    103	struct pcpu_alloc_info *ai;
    104	struct pcpu_group_info *gi;
    105	unsigned int cpu;
    106	ssize_t static_size, reserved_size, dyn_size;
    107
    108	ai = pcpu_alloc_alloc_info(1, num_possible_cpus());
    109	if (!ai)
    110		panic("failed to allocate pcpu_alloc_info");
    111	gi = &ai->groups[0];
    112
    113	/* units are assigned consecutively to possible cpus */
    114	for_each_possible_cpu(cpu)
    115		gi->cpu_map[gi->nr_units++] = cpu;
    116
    117	/* set parameters */
    118	static_size = __per_cpu_end - __per_cpu_start;
    119	reserved_size = PERCPU_MODULE_RESERVE;
    120	dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size;
    121	if (dyn_size < 0)
    122		panic("percpu area overflow static=%zd reserved=%zd\n",
    123		      static_size, reserved_size);
    124
    125	ai->static_size		= static_size;
    126	ai->reserved_size	= reserved_size;
    127	ai->dyn_size		= dyn_size;
    128	ai->unit_size		= PERCPU_PAGE_SIZE;
    129	ai->atom_size		= PAGE_SIZE;
    130	ai->alloc_size		= PERCPU_PAGE_SIZE;
    131
    132	pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
    133	pcpu_free_alloc_info(ai);
    134}
    135#else
    136#define alloc_per_cpu_data() do { } while (0)
    137#endif /* CONFIG_SMP */
    138
    139/**
    140 * find_memory - setup memory map
    141 *
    142 * Walk the EFI memory map and find usable memory for the system, taking
    143 * into account reserved areas.
    144 */
    145void __init
    146find_memory (void)
    147{
    148	reserve_memory();
    149
    150	/* first find highest page frame number */
    151	min_low_pfn = ~0UL;
    152	max_low_pfn = 0;
    153	efi_memmap_walk(find_max_min_low_pfn, NULL);
    154	max_pfn = max_low_pfn;
    155
    156	memblock_add_node(0, PFN_PHYS(max_low_pfn), 0, MEMBLOCK_NONE);
    157
    158	find_initrd();
    159
    160	alloc_per_cpu_data();
    161}
    162
    163static int __init find_largest_hole(u64 start, u64 end, void *arg)
    164{
    165	u64 *max_gap = arg;
    166
    167	static u64 last_end = PAGE_OFFSET;
    168
    169	/* NOTE: this algorithm assumes efi memmap table is ordered */
    170
    171	if (*max_gap < (start - last_end))
    172		*max_gap = start - last_end;
    173	last_end = end;
    174	return 0;
    175}
    176
    177static void __init verify_gap_absence(void)
    178{
    179	unsigned long max_gap;
    180
    181	/* Forbid FLATMEM if hole is > than 1G */
    182	efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
    183	if (max_gap >= SZ_1G)
    184		panic("Cannot use FLATMEM with %ldMB hole\n"
    185		      "Please switch over to SPARSEMEM\n",
    186		      (max_gap >> 20));
    187}
    188
    189/*
    190 * Set up the page tables.
    191 */
    192
    193void __init
    194paging_init (void)
    195{
    196	unsigned long max_dma;
    197	unsigned long max_zone_pfns[MAX_NR_ZONES];
    198
    199	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
    200	max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
    201	max_zone_pfns[ZONE_DMA32] = max_dma;
    202	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
    203
    204	verify_gap_absence();
    205
    206	free_area_init(max_zone_pfns);
    207	zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
    208}