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-rw-r--r--arch/tile/mm/init.c956
1 files changed, 0 insertions, 956 deletions
diff --git a/arch/tile/mm/init.c b/arch/tile/mm/init.c
deleted file mode 100644
index 5f757e04bcd2..000000000000
--- a/arch/tile/mm/init.c
+++ /dev/null
@@ -1,956 +0,0 @@
-/*
- * Copyright (C) 1995 Linus Torvalds
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for
- * more details.
- */
-
-#include <linux/module.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/ptrace.h>
-#include <linux/mman.h>
-#include <linux/mm.h>
-#include <linux/hugetlb.h>
-#include <linux/swap.h>
-#include <linux/smp.h>
-#include <linux/init.h>
-#include <linux/highmem.h>
-#include <linux/pagemap.h>
-#include <linux/poison.h>
-#include <linux/bootmem.h>
-#include <linux/slab.h>
-#include <linux/proc_fs.h>
-#include <linux/efi.h>
-#include <linux/memory_hotplug.h>
-#include <linux/uaccess.h>
-#include <asm/mmu_context.h>
-#include <asm/processor.h>
-#include <asm/pgtable.h>
-#include <asm/pgalloc.h>
-#include <asm/dma.h>
-#include <asm/fixmap.h>
-#include <asm/tlb.h>
-#include <asm/tlbflush.h>
-#include <asm/sections.h>
-#include <asm/setup.h>
-#include <asm/homecache.h>
-#include <hv/hypervisor.h>
-#include <arch/chip.h>
-
-#include "migrate.h"
-
-#define clear_pgd(pmdptr) (*(pmdptr) = hv_pte(0))
-
-#ifndef __tilegx__
-unsigned long VMALLOC_RESERVE = CONFIG_VMALLOC_RESERVE;
-EXPORT_SYMBOL(VMALLOC_RESERVE);
-#endif
-
-/* Create an L2 page table */
-static pte_t * __init alloc_pte(void)
-{
- return __alloc_bootmem(L2_KERNEL_PGTABLE_SIZE, HV_PAGE_TABLE_ALIGN, 0);
-}
-
-/*
- * L2 page tables per controller. We allocate these all at once from
- * the bootmem allocator and store them here. This saves on kernel L2
- * page table memory, compared to allocating a full 64K page per L2
- * page table, and also means that in cases where we use huge pages,
- * we are guaranteed to later be able to shatter those huge pages and
- * switch to using these page tables instead, without requiring
- * further allocation. Each l2_ptes[] entry points to the first page
- * table for the first hugepage-size piece of memory on the
- * controller; other page tables are just indexed directly, i.e. the
- * L2 page tables are contiguous in memory for each controller.
- */
-static pte_t *l2_ptes[MAX_NUMNODES];
-static int num_l2_ptes[MAX_NUMNODES];
-
-static void init_prealloc_ptes(int node, int pages)
-{
- BUG_ON(pages & (PTRS_PER_PTE - 1));
- if (pages) {
- num_l2_ptes[node] = pages;
- l2_ptes[node] = __alloc_bootmem(pages * sizeof(pte_t),
- HV_PAGE_TABLE_ALIGN, 0);
- }
-}
-
-pte_t *get_prealloc_pte(unsigned long pfn)
-{
- int node = pfn_to_nid(pfn);
- pfn &= ~(-1UL << (NR_PA_HIGHBIT_SHIFT - PAGE_SHIFT));
- BUG_ON(node >= MAX_NUMNODES);
- BUG_ON(pfn >= num_l2_ptes[node]);
- return &l2_ptes[node][pfn];
-}
-
-/*
- * What caching do we expect pages from the heap to have when
- * they are allocated during bootup? (Once we've installed the
- * "real" swapper_pg_dir.)
- */
-static int initial_heap_home(void)
-{
- if (hash_default)
- return PAGE_HOME_HASH;
- return smp_processor_id();
-}
-
-/*
- * Place a pointer to an L2 page table in a middle page
- * directory entry.
- */
-static void __init assign_pte(pmd_t *pmd, pte_t *page_table)
-{
- phys_addr_t pa = __pa(page_table);
- unsigned long l2_ptfn = pa >> HV_LOG2_PAGE_TABLE_ALIGN;
- pte_t pteval = hv_pte_set_ptfn(__pgprot(_PAGE_TABLE), l2_ptfn);
- BUG_ON((pa & (HV_PAGE_TABLE_ALIGN-1)) != 0);
- pteval = pte_set_home(pteval, initial_heap_home());
- *(pte_t *)pmd = pteval;
- if (page_table != (pte_t *)pmd_page_vaddr(*pmd))
- BUG();
-}
-
-#ifdef __tilegx__
-
-static inline pmd_t *alloc_pmd(void)
-{
- return __alloc_bootmem(L1_KERNEL_PGTABLE_SIZE, HV_PAGE_TABLE_ALIGN, 0);
-}
-
-static inline void assign_pmd(pud_t *pud, pmd_t *pmd)
-{
- assign_pte((pmd_t *)pud, (pte_t *)pmd);
-}
-
-#endif /* __tilegx__ */
-
-/* Replace the given pmd with a full PTE table. */
-void __init shatter_pmd(pmd_t *pmd)
-{
- pte_t *pte = get_prealloc_pte(pte_pfn(*(pte_t *)pmd));
- assign_pte(pmd, pte);
-}
-
-#ifdef __tilegx__
-static pmd_t *__init get_pmd(pgd_t pgtables[], unsigned long va)
-{
- pud_t *pud = pud_offset(&pgtables[pgd_index(va)], va);
- if (pud_none(*pud))
- assign_pmd(pud, alloc_pmd());
- return pmd_offset(pud, va);
-}
-#else
-static pmd_t *__init get_pmd(pgd_t pgtables[], unsigned long va)
-{
- return pmd_offset(pud_offset(&pgtables[pgd_index(va)], va), va);
-}
-#endif
-
-/*
- * This function initializes a certain range of kernel virtual memory
- * with new bootmem page tables, everywhere page tables are missing in
- * the given range.
- */
-
-/*
- * NOTE: The pagetables are allocated contiguous on the physical space
- * so we can cache the place of the first one and move around without
- * checking the pgd every time.
- */
-static void __init page_table_range_init(unsigned long start,
- unsigned long end, pgd_t *pgd)
-{
- unsigned long vaddr;
- start = round_down(start, PMD_SIZE);
- end = round_up(end, PMD_SIZE);
- for (vaddr = start; vaddr < end; vaddr += PMD_SIZE) {
- pmd_t *pmd = get_pmd(pgd, vaddr);
- if (pmd_none(*pmd))
- assign_pte(pmd, alloc_pte());
- }
-}
-
-
-static int __initdata ktext_hash = 1; /* .text pages */
-static int __initdata kdata_hash = 1; /* .data and .bss pages */
-int __ro_after_init hash_default = 1; /* kernel allocator pages */
-EXPORT_SYMBOL(hash_default);
-int __ro_after_init kstack_hash = 1; /* if no homecaching, use h4h */
-
-/*
- * CPUs to use to for striping the pages of kernel data. If hash-for-home
- * is available, this is only relevant if kcache_hash sets up the
- * .data and .bss to be page-homed, and we don't want the default mode
- * of using the full set of kernel cpus for the striping.
- */
-static __initdata struct cpumask kdata_mask;
-static __initdata int kdata_arg_seen;
-
-int __ro_after_init kdata_huge; /* if no homecaching, small pages */
-
-
-/* Combine a generic pgprot_t with cache home to get a cache-aware pgprot. */
-static pgprot_t __init construct_pgprot(pgprot_t prot, int home)
-{
- prot = pte_set_home(prot, home);
- if (home == PAGE_HOME_IMMUTABLE) {
- if (ktext_hash)
- prot = hv_pte_set_mode(prot, HV_PTE_MODE_CACHE_HASH_L3);
- else
- prot = hv_pte_set_mode(prot, HV_PTE_MODE_CACHE_NO_L3);
- }
- return prot;
-}
-
-/*
- * For a given kernel data VA, how should it be cached?
- * We return the complete pgprot_t with caching bits set.
- */
-static pgprot_t __init init_pgprot(ulong address)
-{
- int cpu;
- unsigned long page;
- enum { CODE_DELTA = MEM_SV_START - PAGE_OFFSET };
-
- /* For kdata=huge, everything is just hash-for-home. */
- if (kdata_huge)
- return construct_pgprot(PAGE_KERNEL, PAGE_HOME_HASH);
-
- /*
- * We map the aliased pages of permanent text so we can
- * update them if necessary, for ftrace, etc.
- */
- if (address < (ulong) _sinittext - CODE_DELTA)
- return construct_pgprot(PAGE_KERNEL, PAGE_HOME_HASH);
-
- /* We map read-only data non-coherent for performance. */
- if ((address >= (ulong) __start_rodata &&
- address < (ulong) __end_rodata) ||
- address == (ulong) empty_zero_page) {
- return construct_pgprot(PAGE_KERNEL_RO, PAGE_HOME_IMMUTABLE);
- }
-
-#ifndef __tilegx__
- /* Force the atomic_locks[] array page to be hash-for-home. */
- if (address == (ulong) atomic_locks)
- return construct_pgprot(PAGE_KERNEL, PAGE_HOME_HASH);
-#endif
-
- /*
- * Everything else that isn't data or bss is heap, so mark it
- * with the initial heap home (hash-for-home, or this cpu). This
- * includes any addresses after the loaded image and any address before
- * __init_end, since we already captured the case of text before
- * _sinittext, and __pa(einittext) is approximately __pa(__init_begin).
- *
- * All the LOWMEM pages that we mark this way will get their
- * struct page homecache properly marked later, in set_page_homes().
- * The HIGHMEM pages we leave with a default zero for their
- * homes, but with a zero free_time we don't have to actually
- * do a flush action the first time we use them, either.
- */
- if (address >= (ulong) _end || address < (ulong) __init_end)
- return construct_pgprot(PAGE_KERNEL, initial_heap_home());
-
- /* Use hash-for-home if requested for data/bss. */
- if (kdata_hash)
- return construct_pgprot(PAGE_KERNEL, PAGE_HOME_HASH);
-
- /*
- * Otherwise we just hand out consecutive cpus. To avoid
- * requiring this function to hold state, we just walk forward from
- * __end_rodata by PAGE_SIZE, skipping the readonly and init data, to
- * reach the requested address, while walking cpu home around
- * kdata_mask. This is typically no more than a dozen or so iterations.
- */
- page = (((ulong)__end_rodata) + PAGE_SIZE - 1) & PAGE_MASK;
- BUG_ON(address < page || address >= (ulong)_end);
- cpu = cpumask_first(&kdata_mask);
- for (; page < address; page += PAGE_SIZE) {
- if (page >= (ulong)&init_thread_union &&
- page < (ulong)&init_thread_union + THREAD_SIZE)
- continue;
- if (page == (ulong)empty_zero_page)
- continue;
-#ifndef __tilegx__
- if (page == (ulong)atomic_locks)
- continue;
-#endif
- cpu = cpumask_next(cpu, &kdata_mask);
- if (cpu == NR_CPUS)
- cpu = cpumask_first(&kdata_mask);
- }
- return construct_pgprot(PAGE_KERNEL, cpu);
-}
-
-/*
- * This function sets up how we cache the kernel text. If we have
- * hash-for-home support, normally that is used instead (see the
- * kcache_hash boot flag for more information). But if we end up
- * using a page-based caching technique, this option sets up the
- * details of that. In addition, the "ktext=nocache" option may
- * always be used to disable local caching of text pages, if desired.
- */
-
-static int __initdata ktext_arg_seen;
-static int __initdata ktext_small;
-static int __initdata ktext_local;
-static int __initdata ktext_all;
-static int __initdata ktext_nondataplane;
-static int __initdata ktext_nocache;
-static struct cpumask __initdata ktext_mask;
-
-static int __init setup_ktext(char *str)
-{
- if (str == NULL)
- return -EINVAL;
-
- /* If you have a leading "nocache", turn off ktext caching */
- if (strncmp(str, "nocache", 7) == 0) {
- ktext_nocache = 1;
- pr_info("ktext: disabling local caching of kernel text\n");
- str += 7;
- if (*str == ',')
- ++str;
- if (*str == '\0')
- return 0;
- }
-
- ktext_arg_seen = 1;
-
- /* Default setting: use a huge page */
- if (strcmp(str, "huge") == 0)
- pr_info("ktext: using one huge locally cached page\n");
-
- /* Pay TLB cost but get no cache benefit: cache small pages locally */
- else if (strcmp(str, "local") == 0) {
- ktext_small = 1;
- ktext_local = 1;
- pr_info("ktext: using small pages with local caching\n");
- }
-
- /* Neighborhood cache ktext pages on all cpus. */
- else if (strcmp(str, "all") == 0) {
- ktext_small = 1;
- ktext_all = 1;
- pr_info("ktext: using maximal caching neighborhood\n");
- }
-
-
- /* Neighborhood ktext pages on specified mask */
- else if (cpulist_parse(str, &ktext_mask) == 0) {
- if (cpumask_weight(&ktext_mask) > 1) {
- ktext_small = 1;
- pr_info("ktext: using caching neighborhood %*pbl with small pages\n",
- cpumask_pr_args(&ktext_mask));
- } else {
- pr_info("ktext: caching on cpu %*pbl with one huge page\n",
- cpumask_pr_args(&ktext_mask));
- }
- }
-
- else if (*str)
- return -EINVAL;
-
- return 0;
-}
-
-early_param("ktext", setup_ktext);
-
-
-static inline pgprot_t ktext_set_nocache(pgprot_t prot)
-{
- if (!ktext_nocache)
- prot = hv_pte_set_nc(prot);
- else
- prot = hv_pte_set_no_alloc_l2(prot);
- return prot;
-}
-
-/* Temporary page table we use for staging. */
-static pgd_t pgtables[PTRS_PER_PGD]
- __attribute__((aligned(HV_PAGE_TABLE_ALIGN)));
-
-/*
- * This maps the physical memory to kernel virtual address space, a total
- * of max_low_pfn pages, by creating page tables starting from address
- * PAGE_OFFSET.
- *
- * This routine transitions us from using a set of compiled-in large
- * pages to using some more precise caching, including removing access
- * to code pages mapped at PAGE_OFFSET (executed only at MEM_SV_START)
- * marking read-only data as locally cacheable, striping the remaining
- * .data and .bss across all the available tiles, and removing access
- * to pages above the top of RAM (thus ensuring a page fault from a bad
- * virtual address rather than a hypervisor shoot down for accessing
- * memory outside the assigned limits).
- */
-static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
-{
- unsigned long long irqmask;
- unsigned long address, pfn;
- pmd_t *pmd;
- pte_t *pte;
- int pte_ofs;
- const struct cpumask *my_cpu_mask = cpumask_of(smp_processor_id());
- struct cpumask kstripe_mask;
- int rc, i;
-
- if (ktext_arg_seen && ktext_hash) {
- pr_warn("warning: \"ktext\" boot argument ignored if \"kcache_hash\" sets up text hash-for-home\n");
- ktext_small = 0;
- }
-
- if (kdata_arg_seen && kdata_hash) {
- pr_warn("warning: \"kdata\" boot argument ignored if \"kcache_hash\" sets up data hash-for-home\n");
- }
-
- if (kdata_huge && !hash_default) {
- pr_warn("warning: disabling \"kdata=huge\"; requires kcache_hash=all or =allbutstack\n");
- kdata_huge = 0;
- }
-
- /*
- * Set up a mask for cpus to use for kernel striping.
- * This is normally all cpus, but minus dataplane cpus if any.
- * If the dataplane covers the whole chip, we stripe over
- * the whole chip too.
- */
- cpumask_copy(&kstripe_mask, cpu_possible_mask);
- if (!kdata_arg_seen)
- kdata_mask = kstripe_mask;
-
- /* Allocate and fill in L2 page tables */
- for (i = 0; i < MAX_NUMNODES; ++i) {
-#ifdef CONFIG_HIGHMEM
- unsigned long end_pfn = node_lowmem_end_pfn[i];
-#else
- unsigned long end_pfn = node_end_pfn[i];
-#endif
- unsigned long end_huge_pfn = 0;
-
- /* Pre-shatter the last huge page to allow per-cpu pages. */
- if (kdata_huge)
- end_huge_pfn = end_pfn - (HPAGE_SIZE >> PAGE_SHIFT);
-
- pfn = node_start_pfn[i];
-
- /* Allocate enough memory to hold L2 page tables for node. */
- init_prealloc_ptes(i, end_pfn - pfn);
-
- address = (unsigned long) pfn_to_kaddr(pfn);
- while (pfn < end_pfn) {
- BUG_ON(address & (HPAGE_SIZE-1));
- pmd = get_pmd(pgtables, address);
- pte = get_prealloc_pte(pfn);
- if (pfn < end_huge_pfn) {
- pgprot_t prot = init_pgprot(address);
- *(pte_t *)pmd = pte_mkhuge(pfn_pte(pfn, prot));
- for (pte_ofs = 0; pte_ofs < PTRS_PER_PTE;
- pfn++, pte_ofs++, address += PAGE_SIZE)
- pte[pte_ofs] = pfn_pte(pfn, prot);
- } else {
- if (kdata_huge)
- printk(KERN_DEBUG "pre-shattered huge page at %#lx\n",
- address);
- for (pte_ofs = 0; pte_ofs < PTRS_PER_PTE;
- pfn++, pte_ofs++, address += PAGE_SIZE) {
- pgprot_t prot = init_pgprot(address);
- pte[pte_ofs] = pfn_pte(pfn, prot);
- }
- assign_pte(pmd, pte);
- }
- }
- }
-
- /*
- * Set or check ktext_map now that we have cpu_possible_mask
- * and kstripe_mask to work with.
- */
- if (ktext_all)
- cpumask_copy(&ktext_mask, cpu_possible_mask);
- else if (ktext_nondataplane)
- ktext_mask = kstripe_mask;
- else if (!cpumask_empty(&ktext_mask)) {
- /* Sanity-check any mask that was requested */
- struct cpumask bad;
- cpumask_andnot(&bad, &ktext_mask, cpu_possible_mask);
- cpumask_and(&ktext_mask, &ktext_mask, cpu_possible_mask);
- if (!cpumask_empty(&bad))
- pr_info("ktext: not using unavailable cpus %*pbl\n",
- cpumask_pr_args(&bad));
- if (cpumask_empty(&ktext_mask)) {
- pr_warn("ktext: no valid cpus; caching on %d\n",
- smp_processor_id());
- cpumask_copy(&ktext_mask,
- cpumask_of(smp_processor_id()));
- }
- }
-
- address = MEM_SV_START;
- pmd = get_pmd(pgtables, address);
- pfn = 0; /* code starts at PA 0 */
- if (ktext_small) {
- /* Allocate an L2 PTE for the kernel text */
- int cpu = 0;
- pgprot_t prot = construct_pgprot(PAGE_KERNEL_EXEC,
- PAGE_HOME_IMMUTABLE);
-
- if (ktext_local) {
- if (ktext_nocache)
- prot = hv_pte_set_mode(prot,
- HV_PTE_MODE_UNCACHED);
- else
- prot = hv_pte_set_mode(prot,
- HV_PTE_MODE_CACHE_NO_L3);
- } else {
- prot = hv_pte_set_mode(prot,
- HV_PTE_MODE_CACHE_TILE_L3);
- cpu = cpumask_first(&ktext_mask);
-
- prot = ktext_set_nocache(prot);
- }
-
- BUG_ON(address != (unsigned long)_text);
- pte = NULL;
- for (; address < (unsigned long)_einittext;
- pfn++, address += PAGE_SIZE) {
- pte_ofs = pte_index(address);
- if (pte_ofs == 0) {
- if (pte)
- assign_pte(pmd++, pte);
- pte = alloc_pte();
- }
- if (!ktext_local) {
- prot = set_remote_cache_cpu(prot, cpu);
- cpu = cpumask_next(cpu, &ktext_mask);
- if (cpu == NR_CPUS)
- cpu = cpumask_first(&ktext_mask);
- }
- pte[pte_ofs] = pfn_pte(pfn, prot);
- }
- if (pte)
- assign_pte(pmd, pte);
- } else {
- pte_t pteval = pfn_pte(0, PAGE_KERNEL_EXEC);
- pteval = pte_mkhuge(pteval);
- if (ktext_hash) {
- pteval = hv_pte_set_mode(pteval,
- HV_PTE_MODE_CACHE_HASH_L3);
- pteval = ktext_set_nocache(pteval);
- } else
- if (cpumask_weight(&ktext_mask) == 1) {
- pteval = set_remote_cache_cpu(pteval,
- cpumask_first(&ktext_mask));
- pteval = hv_pte_set_mode(pteval,
- HV_PTE_MODE_CACHE_TILE_L3);
- pteval = ktext_set_nocache(pteval);
- } else if (ktext_nocache)
- pteval = hv_pte_set_mode(pteval,
- HV_PTE_MODE_UNCACHED);
- else
- pteval = hv_pte_set_mode(pteval,
- HV_PTE_MODE_CACHE_NO_L3);
- for (; address < (unsigned long)_einittext;
- pfn += PFN_DOWN(HPAGE_SIZE), address += HPAGE_SIZE)
- *(pte_t *)(pmd++) = pfn_pte(pfn, pteval);
- }
-
- /* Set swapper_pgprot here so it is flushed to memory right away. */
- swapper_pgprot = init_pgprot((unsigned long)swapper_pg_dir);
-
- /*
- * Since we may be changing the caching of the stack and page
- * table itself, we invoke an assembly helper to do the
- * following steps:
- *
- * - flush the cache so we start with an empty slate
- * - install pgtables[] as the real page table
- * - flush the TLB so the new page table takes effect
- */
- irqmask = interrupt_mask_save_mask();
- interrupt_mask_set_mask(-1ULL);
- rc = flush_and_install_context(__pa(pgtables),
- init_pgprot((unsigned long)pgtables),
- __this_cpu_read(current_asid),
- cpumask_bits(my_cpu_mask));
- interrupt_mask_restore_mask(irqmask);
- BUG_ON(rc != 0);
-
- /* Copy the page table back to the normal swapper_pg_dir. */
- memcpy(pgd_base, pgtables, sizeof(pgtables));
- __install_page_table(pgd_base, __this_cpu_read(current_asid),
- swapper_pgprot);
-
- /*
- * We just read swapper_pgprot and thus brought it into the cache,
- * with its new home & caching mode. When we start the other CPUs,
- * they're going to reference swapper_pgprot via their initial fake
- * VA-is-PA mappings, which cache everything locally. At that
- * time, if it's in our cache with a conflicting home, the
- * simulator's coherence checker will complain. So, flush it out
- * of our cache; we're not going to ever use it again anyway.
- */
- __insn_finv(&swapper_pgprot);
-}
-
-/*
- * devmem_is_allowed() checks to see if /dev/mem access to a certain address
- * is valid. The argument is a physical page number.
- *
- * On Tile, the only valid things for which we can just hand out unchecked
- * PTEs are the kernel code and data. Anything else might change its
- * homing with time, and we wouldn't know to adjust the /dev/mem PTEs.
- * Note that init_thread_union is released to heap soon after boot,
- * so we include it in the init data.
- *
- * For TILE-Gx, we might want to consider allowing access to PA
- * regions corresponding to PCI space, etc.
- */
-int devmem_is_allowed(unsigned long pagenr)
-{
- return pagenr < kaddr_to_pfn(_end) &&
- !(pagenr >= kaddr_to_pfn(&init_thread_union) ||
- pagenr < kaddr_to_pfn(__init_end)) &&
- !(pagenr >= kaddr_to_pfn(_sinittext) ||
- pagenr <= kaddr_to_pfn(_einittext-1));
-}
-
-#ifdef CONFIG_HIGHMEM
-static void __init permanent_kmaps_init(pgd_t *pgd_base)
-{
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
- unsigned long vaddr;
-
- vaddr = PKMAP_BASE;
- page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
-
- pgd = swapper_pg_dir + pgd_index(vaddr);
- pud = pud_offset(pgd, vaddr);
- pmd = pmd_offset(pud, vaddr);
- pte = pte_offset_kernel(pmd, vaddr);
- pkmap_page_table = pte;
-}
-#endif /* CONFIG_HIGHMEM */
-
-
-#ifndef CONFIG_64BIT
-static void __init init_free_pfn_range(unsigned long start, unsigned long end)
-{
- unsigned long pfn;
- struct page *page = pfn_to_page(start);
-
- for (pfn = start; pfn < end; ) {
- /* Optimize by freeing pages in large batches */
- int order = __ffs(pfn);
- int count, i;
- struct page *p;
-
- if (order >= MAX_ORDER)
- order = MAX_ORDER-1;
- count = 1 << order;
- while (pfn + count > end) {
- count >>= 1;
- --order;
- }
- for (p = page, i = 0; i < count; ++i, ++p) {
- __ClearPageReserved(p);
- /*
- * Hacky direct set to avoid unnecessary
- * lock take/release for EVERY page here.
- */
- p->_refcount.counter = 0;
- p->_mapcount.counter = -1;
- }
- init_page_count(page);
- __free_pages(page, order);
- adjust_managed_page_count(page, count);
-
- page += count;
- pfn += count;
- }
-}
-
-static void __init set_non_bootmem_pages_init(void)
-{
- struct zone *z;
- for_each_zone(z) {
- unsigned long start, end;
- int nid = z->zone_pgdat->node_id;
-#ifdef CONFIG_HIGHMEM
- int idx = zone_idx(z);
-#endif
-
- start = z->zone_start_pfn;
- end = start + z->spanned_pages;
- start = max(start, node_free_pfn[nid]);
- start = max(start, max_low_pfn);
-
-#ifdef CONFIG_HIGHMEM
- if (idx == ZONE_HIGHMEM)
- totalhigh_pages += z->spanned_pages;
-#endif
- if (kdata_huge) {
- unsigned long percpu_pfn = node_percpu_pfn[nid];
- if (start < percpu_pfn && end > percpu_pfn)
- end = percpu_pfn;
- }
-#ifdef CONFIG_PCI
- if (start <= pci_reserve_start_pfn &&
- end > pci_reserve_start_pfn) {
- if (end > pci_reserve_end_pfn)
- init_free_pfn_range(pci_reserve_end_pfn, end);
- end = pci_reserve_start_pfn;
- }
-#endif
- init_free_pfn_range(start, end);
- }
-}
-#endif
-
-/*
- * paging_init() sets up the page tables - note that all of lowmem is
- * already mapped by head.S.
- */
-void __init paging_init(void)
-{
-#ifdef __tilegx__
- pud_t *pud;
-#endif
- pgd_t *pgd_base = swapper_pg_dir;
-
- kernel_physical_mapping_init(pgd_base);
-
- /* Fixed mappings, only the page table structure has to be created. */
- page_table_range_init(fix_to_virt(__end_of_fixed_addresses - 1),
- FIXADDR_TOP, pgd_base);
-
-#ifdef CONFIG_HIGHMEM
- permanent_kmaps_init(pgd_base);
-#endif
-
-#ifdef __tilegx__
- /*
- * Since GX allocates just one pmd_t array worth of vmalloc space,
- * we go ahead and allocate it statically here, then share it
- * globally. As a result we don't have to worry about any task
- * changing init_mm once we get up and running, and there's no
- * need for e.g. vmalloc_sync_all().
- */
- BUILD_BUG_ON(pgd_index(VMALLOC_START) != pgd_index(VMALLOC_END - 1));
- pud = pud_offset(pgd_base + pgd_index(VMALLOC_START), VMALLOC_START);
- assign_pmd(pud, alloc_pmd());
-#endif
-}
-
-
-/*
- * Walk the kernel page tables and derive the page_home() from
- * the PTEs, so that set_pte() can properly validate the caching
- * of all PTEs it sees.
- */
-void __init set_page_homes(void)
-{
-}
-
-static void __init set_max_mapnr_init(void)
-{
-#ifdef CONFIG_FLATMEM
- max_mapnr = max_low_pfn;
-#endif
-}
-
-void __init mem_init(void)
-{
- int i;
-#ifndef __tilegx__
- void *last;
-#endif
-
-#ifdef CONFIG_FLATMEM
- BUG_ON(!mem_map);
-#endif
-
-#ifdef CONFIG_HIGHMEM
- /* check that fixmap and pkmap do not overlap */
- if (PKMAP_ADDR(LAST_PKMAP-1) >= FIXADDR_START) {
- pr_err("fixmap and kmap areas overlap - this will crash\n");
- pr_err("pkstart: %lxh pkend: %lxh fixstart %lxh\n",
- PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP-1), FIXADDR_START);
- BUG();
- }
-#endif
-
- set_max_mapnr_init();
-
- /* this will put all bootmem onto the freelists */
- free_all_bootmem();
-
-#ifndef CONFIG_64BIT
- /* count all remaining LOWMEM and give all HIGHMEM to page allocator */
- set_non_bootmem_pages_init();
-#endif
-
- mem_init_print_info(NULL);
-
- /*
- * In debug mode, dump some interesting memory mappings.
- */
-#ifdef CONFIG_HIGHMEM
- printk(KERN_DEBUG " KMAP %#lx - %#lx\n",
- FIXADDR_START, FIXADDR_TOP + PAGE_SIZE - 1);
- printk(KERN_DEBUG " PKMAP %#lx - %#lx\n",
- PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP) - 1);
-#endif
- printk(KERN_DEBUG " VMALLOC %#lx - %#lx\n",
- _VMALLOC_START, _VMALLOC_END - 1);
-#ifdef __tilegx__
- for (i = MAX_NUMNODES-1; i >= 0; --i) {
- struct pglist_data *node = &node_data[i];
- if (node->node_present_pages) {
- unsigned long start = (unsigned long)
- pfn_to_kaddr(node->node_start_pfn);
- unsigned long end = start +
- (node->node_present_pages << PAGE_SHIFT);
- printk(KERN_DEBUG " MEM%d %#lx - %#lx\n",
- i, start, end - 1);
- }
- }
-#else
- last = high_memory;
- for (i = MAX_NUMNODES-1; i >= 0; --i) {
- if ((unsigned long)vbase_map[i] != -1UL) {
- printk(KERN_DEBUG " LOWMEM%d %#lx - %#lx\n",
- i, (unsigned long) (vbase_map[i]),
- (unsigned long) (last-1));
- last = vbase_map[i];
- }
- }
-#endif
-
-#ifndef __tilegx__
- /*
- * Convert from using one lock for all atomic operations to
- * one per cpu.
- */
- __init_atomic_per_cpu();
-#endif
-}
-
-struct kmem_cache *pgd_cache;
-
-void __init pgtable_cache_init(void)
-{
- pgd_cache = kmem_cache_create("pgd", SIZEOF_PGD, SIZEOF_PGD, 0, NULL);
- if (!pgd_cache)
- panic("pgtable_cache_init(): Cannot create pgd cache");
-}
-
-static long __ro_after_init initfree = 1;
-static bool __ro_after_init set_initfree_done;
-
-/* Select whether to free (1) or mark unusable (0) the __init pages. */
-static int __init set_initfree(char *str)
-{
- long val;
- if (kstrtol(str, 0, &val) == 0) {
- set_initfree_done = true;
- initfree = val;
- pr_info("initfree: %s free init pages\n",
- initfree ? "will" : "won't");
- }
- return 1;
-}
-__setup("initfree=", set_initfree);
-
-static void free_init_pages(char *what, unsigned long begin, unsigned long end)
-{
- unsigned long addr = (unsigned long) begin;
-
- /* Prefer user request first */
- if (!set_initfree_done) {
- if (debug_pagealloc_enabled())
- initfree = 0;
- }
- if (kdata_huge && !initfree) {
- pr_warn("Warning: ignoring initfree=0: incompatible with kdata=huge\n");
- initfree = 1;
- }
- end = (end + PAGE_SIZE - 1) & PAGE_MASK;
- local_flush_tlb_pages(NULL, begin, PAGE_SIZE, end - begin);
- for (addr = begin; addr < end; addr += PAGE_SIZE) {
- /*
- * Note we just reset the home here directly in the
- * page table. We know this is safe because our caller
- * just flushed the caches on all the other cpus,
- * and they won't be touching any of these pages.
- */
- int pfn = kaddr_to_pfn((void *)addr);
- struct page *page = pfn_to_page(pfn);
- pte_t *ptep = virt_to_kpte(addr);
- if (!initfree) {
- /*
- * If debugging page accesses then do not free
- * this memory but mark them not present - any
- * buggy init-section access will create a
- * kernel page fault:
- */
- pte_clear(&init_mm, addr, ptep);
- continue;
- }
- if (pte_huge(*ptep))
- BUG_ON(!kdata_huge);
- else
- set_pte_at(&init_mm, addr, ptep,
- pfn_pte(pfn, PAGE_KERNEL));
- memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
- free_reserved_page(page);
- }
- pr_info("Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
-}
-
-void free_initmem(void)
-{
- const unsigned long text_delta = MEM_SV_START - PAGE_OFFSET;
-
- /*
- * Evict the cache on all cores to avoid incoherence.
- * We are guaranteed that no one will touch the init pages any more.
- */
- homecache_evict(&cpu_cacheable_map);
-
- /* Free the data pages that we won't use again after init. */
- free_init_pages("unused kernel data",
- (unsigned long)__init_begin,
- (unsigned long)__init_end);
-
- /*
- * Free the pages mapped from 0xc0000000 that correspond to code
- * pages from MEM_SV_START that we won't use again after init.
- */
- free_init_pages("unused kernel text",
- (unsigned long)_sinittext - text_delta,
- (unsigned long)_einittext - text_delta);
- /* Do a global TLB flush so everyone sees the changes. */
- flush_tlb_all();
-}