// SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #include <linux/bug.h> #include <linux/module.h> #include <linux/init.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/pagemap.h> #include <linux/ptrace.h> #include <linux/mman.h> #include <linux/mm.h> #include <linux/highmem.h> #include <linux/memblock.h> #include <linux/swap.h> #include <linux/proc_fs.h> #include <linux/pfn.h> #include <asm/setup.h> #include <asm/cachectl.h> #include <asm/dma.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> #include <asm/mmu_context.h> #include <asm/sections.h> #include <asm/tlb.h> pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss; unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; EXPORT_SYMBOL(empty_zero_page); void __init mem_init(void) { #ifdef CONFIG_HIGHMEM unsigned long tmp; max_mapnr = highend_pfn; #else max_mapnr = max_low_pfn; #endif high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); memblock_free_all(); #ifdef CONFIG_HIGHMEM for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) { struct page *page = pfn_to_page(tmp); /* FIXME not sure about */ if (!memblock_is_reserved(tmp << PAGE_SHIFT)) free_highmem_page(page); } #endif mem_init_print_info(NULL); } #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { if (start < end) pr_info("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); for (; start < end; start += PAGE_SIZE) { ClearPageReserved(virt_to_page(start)); init_page_count(virt_to_page(start)); free_page(start); totalram_pages_inc(); } } #endif extern char __init_begin[], __init_end[]; void free_initmem(void) { unsigned long addr; addr = (unsigned long) &__init_begin; while (addr < (unsigned long) &__init_end) { ClearPageReserved(virt_to_page(addr)); init_page_count(virt_to_page(addr)); free_page(addr); totalram_pages_inc(); addr += PAGE_SIZE; } pr_info("Freeing unused kernel memory: %dk freed\n", ((unsigned int)&__init_end - (unsigned int)&__init_begin) >> 10); } void pgd_init(unsigned long *p) { int i; for (i = 0; i < PTRS_PER_PGD; i++) p[i] = __pa(invalid_pte_table); } void __init pre_mmu_init(void) { /* * Setup page-table and enable TLB-hardrefill */ flush_tlb_all(); pgd_init((unsigned long *)swapper_pg_dir); TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir); TLBMISS_HANDLER_SETUP_PGD_KERNEL(swapper_pg_dir); asid_cache(smp_processor_id()) = ASID_FIRST_VERSION; /* Setup page mask to 4k */ write_mmu_pagemask(0); }