^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * Copyright (C) 2013 Altera Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2009 Wind River Systems Inc
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2004 Microtronix Datacom Ltd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * based on arch/m68k/mm/init.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * License. See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/binfmts.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <asm/tlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <asm/mmu_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <asm/cpuinfo.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) pgd_t *pgd_current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * paging_init() continues the virtual memory environment setup which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * was begun by the code in arch/head.S.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * The parameters are pointers to where to stick the starting and ending
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * addresses of available kernel virtual memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) void __init paging_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) pagetable_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) pgd_current = swapper_pg_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) max_zone_pfn[ZONE_NORMAL] = max_mapnr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /* pass the memory from the bootmem allocator to the main allocator */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) free_area_init(max_zone_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) flush_dcache_range((unsigned long)empty_zero_page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) (unsigned long)empty_zero_page + PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) void __init mem_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) unsigned long end_mem = memory_end; /* this must not include
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) kernel stack at top */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) pr_debug("mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) end_mem &= PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) high_memory = __va(end_mem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /* this will put all memory onto the freelists */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) memblock_free_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) mem_init_print_info(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) void __init mmu_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) flush_tlb_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) #define __page_aligned(order) __aligned(PAGE_SIZE << (order))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static struct page *kuser_page[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) static int alloc_kuser_page(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) extern char __kuser_helper_start[], __kuser_helper_end[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) int kuser_sz = __kuser_helper_end - __kuser_helper_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) unsigned long vpage;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) vpage = get_zeroed_page(GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (!vpage)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /* Copy kuser helpers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) memcpy((void *)vpage, __kuser_helper_start, kuser_sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) flush_icache_range(vpage, vpage + KUSER_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) kuser_page[0] = virt_to_page(vpage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) arch_initcall(alloc_kuser_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct mm_struct *mm = current->mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) mmap_write_lock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) /* Map kuser helpers to user space address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) ret = install_special_mapping(mm, KUSER_BASE, KUSER_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) VM_READ | VM_EXEC | VM_MAYREAD |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) VM_MAYEXEC, kuser_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) mmap_write_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) const char *arch_vma_name(struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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