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5d2ee1a17f
free_area_init() only requires the definition of maximal PFN for each of the supported zone rater than calculation of actual zone sizes and the sizes of the holes between the zones. After removal of CONFIG_HAVE_MEMBLOCK_NODE_MAP the free_area_init() is available to all architectures. Using this function instead of free_area_init_node() simplifies the zone detection. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Tested-by: Hoan Tran <hoan@os.amperecomputing.com> [arm64] Cc: Baoquan He <bhe@redhat.com> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Hocko <mhocko@kernel.org> Cc: Michal Simek <monstr@monstr.eu> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200412194859.12663-11-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/m68k/mm/sun3mmu.c
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*
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* Implementations of mm routines specific to the sun3 MMU.
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*
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* Moved here 8/20/1999 Sam Creasey
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*
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/memblock.h>
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#include <asm/setup.h>
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#include <linux/uaccess.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/machdep.h>
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#include <asm/io.h>
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extern void mmu_emu_init (unsigned long bootmem_end);
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const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
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extern unsigned long num_pages;
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/* For the sun3 we try to follow the i386 paging_init() more closely */
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/* start_mem and end_mem have PAGE_OFFSET added already */
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/* now sets up tables using sun3 PTEs rather than i386 as before. --m */
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void __init paging_init(void)
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{
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pgd_t * pg_dir;
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pte_t * pg_table;
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int i;
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unsigned long address;
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unsigned long next_pgtable;
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unsigned long bootmem_end;
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unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, };
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unsigned long size;
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empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
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if (!empty_zero_page)
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panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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__func__, PAGE_SIZE, PAGE_SIZE);
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address = PAGE_OFFSET;
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pg_dir = swapper_pg_dir;
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memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
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memset (kernel_pg_dir, 0, sizeof (kernel_pg_dir));
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size = num_pages * sizeof(pte_t);
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size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
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next_pgtable = (unsigned long)memblock_alloc(size, PAGE_SIZE);
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if (!next_pgtable)
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panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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__func__, size, PAGE_SIZE);
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bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
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/* Map whole memory from PAGE_OFFSET (0x0E000000) */
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pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
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while (address < (unsigned long)high_memory) {
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pg_table = (pte_t *) __pa (next_pgtable);
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next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
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pgd_val(*pg_dir) = (unsigned long) pg_table;
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pg_dir++;
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/* now change pg_table to kernel virtual addresses */
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pg_table = (pte_t *) __va ((unsigned long) pg_table);
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for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
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pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
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if (address >= (unsigned long)high_memory)
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pte_val (pte) = 0;
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set_pte (pg_table, pte);
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address += PAGE_SIZE;
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}
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}
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mmu_emu_init(bootmem_end);
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current->mm = NULL;
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/* memory sizing is a hack stolen from motorola.c.. hope it works for us */
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max_zone_pfn[ZONE_DMA] = ((unsigned long)high_memory) >> PAGE_SHIFT;
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/* I really wish I knew why the following change made things better... -- Sam */
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free_area_init(max_zone_pfn);
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}
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