Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *  Port on Texas Instruments TMS320C6x architecture
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/swap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #ifdef CONFIG_BLK_DEV_RAM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/initrd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * ZERO_PAGE is a special page that is used for zero-initialized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * data and COW.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) unsigned long empty_zero_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) EXPORT_SYMBOL(empty_zero_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)  * paging_init() continues the virtual memory environment setup which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)  * was begun by the code in arch/head.S.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)  * The parameters are pointers to where to stick the starting and ending
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)  * addresses  of available kernel virtual memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) void __init paging_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	struct pglist_data *pgdat = NODE_DATA(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	unsigned long max_zone_pfn[MAX_NR_ZONES] = {0, };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	empty_zero_page      = (unsigned long) memblock_alloc(PAGE_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 							      PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	if (!empty_zero_page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		      __func__, PAGE_SIZE, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	 * Set up user data space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	set_fs(KERNEL_DS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	 * Define zones
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	max_zone_pfn[ZONE_NORMAL] = memory_end >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	free_area_init(max_zone_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) void __init mem_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	high_memory = (void *)(memory_end & PAGE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	/* this will put all memory onto the freelists */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	memblock_free_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	mem_init_print_info(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }