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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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9d35dc3006
Current C-SKY ASID mechanism is from mips and it doesn't work well with multi-cores. ASID per core mechanism is not suitable for C-SKY SMP tlb maintain operations, eg: tlbi.vas need share the same asid in all processors and it'll invalid the tlb entry in all cores with the same asid. This patch is prepare for new ASID mechanism. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de>
119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/bug.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/pagemap.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/highmem.h>
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#include <linux/memblock.h>
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#include <linux/swap.h>
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#include <linux/proc_fs.h>
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#include <linux/pfn.h>
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#include <asm/setup.h>
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#include <asm/cachectl.h>
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#include <asm/dma.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/mmu_context.h>
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#include <asm/sections.h>
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#include <asm/tlb.h>
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
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pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
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unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
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__page_aligned_bss;
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EXPORT_SYMBOL(empty_zero_page);
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void __init mem_init(void)
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{
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#ifdef CONFIG_HIGHMEM
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unsigned long tmp;
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max_mapnr = highend_pfn;
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#else
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max_mapnr = max_low_pfn;
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#endif
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high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
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memblock_free_all();
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#ifdef CONFIG_HIGHMEM
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for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
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struct page *page = pfn_to_page(tmp);
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/* FIXME not sure about */
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if (!memblock_is_reserved(tmp << PAGE_SHIFT))
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free_highmem_page(page);
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}
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#endif
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mem_init_print_info(NULL);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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if (start < end)
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pr_info("Freeing initrd memory: %ldk freed\n",
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(end - start) >> 10);
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for (; start < end; start += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(start));
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init_page_count(virt_to_page(start));
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free_page(start);
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totalram_pages_inc();
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}
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}
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#endif
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extern char __init_begin[], __init_end[];
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void free_initmem(void)
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{
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unsigned long addr;
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addr = (unsigned long) &__init_begin;
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while (addr < (unsigned long) &__init_end) {
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ClearPageReserved(virt_to_page(addr));
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init_page_count(virt_to_page(addr));
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free_page(addr);
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totalram_pages_inc();
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addr += PAGE_SIZE;
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}
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pr_info("Freeing unused kernel memory: %dk freed\n",
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((unsigned int)&__init_end - (unsigned int)&__init_begin) >> 10);
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}
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void pgd_init(unsigned long *p)
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{
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int i;
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for (i = 0; i < PTRS_PER_PGD; i++)
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p[i] = __pa(invalid_pte_table);
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}
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void __init pre_mmu_init(void)
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{
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/*
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* Setup page-table and enable TLB-hardrefill
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*/
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flush_tlb_all();
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pgd_init((unsigned long *)swapper_pg_dir);
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TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir);
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TLBMISS_HANDLER_SETUP_PGD_KERNEL(swapper_pg_dir);
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/* Setup page mask to 4k */
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write_mmu_pagemask(0);
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}
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