^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/arch/h8300/mm/init.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Kenneth Albanowski <kjahds@kjahds.com>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Based on:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * linux/arch/m68knommu/mm/init.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * linux/arch/m68k/mm/init.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Copyright (C) 1995 Hamish Macdonald
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * DEC/2000 -- linux 2.4 support <davidm@snapgear.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/swap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <asm/segment.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * ZERO_PAGE is a special page that is used for zero-initialized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * data and COW.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) unsigned long empty_zero_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * paging_init() continues the virtual memory environment setup which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * was begun by the code in arch/head.S.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * The parameters are pointers to where to stick the starting and ending
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * addresses of available kernel virtual memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) void __init paging_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * Make sure start_mem is page aligned, otherwise bootmem and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * page_alloc get different views og the world.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) unsigned long start_mem = PAGE_ALIGN(memory_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) unsigned long end_mem = memory_end & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) pr_debug("start_mem is %#lx\nvirtual_end is %#lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) start_mem, end_mem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * Initialize the bad page table and bad page to point
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * to a couple of allocated pages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) empty_zero_page = (unsigned long)memblock_alloc(PAGE_SIZE, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) if (!empty_zero_page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) __func__, PAGE_SIZE, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * Set up SFC/DFC registers (user data space).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) set_fs(USER_DS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) pr_debug("before free_area_init\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) pr_debug("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) start_mem, end_mem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) unsigned long max_zone_pfn[MAX_NR_ZONES] = {0, };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) max_zone_pfn[ZONE_NORMAL] = end_mem >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) free_area_init(max_zone_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) void __init mem_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) pr_devel("Mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) high_memory = (void *) (memory_end & PAGE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) max_mapnr = MAP_NR(high_memory);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /* this will put all low memory onto the freelists */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) memblock_free_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) mem_init_print_info(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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