^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) * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #ifdef CONFIG_BLK_DEV_INITRD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/initrd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/of_fdt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/swap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/page.h>
^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 <asm/arcregs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) EXPORT_SYMBOL(empty_zero_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static const unsigned long low_mem_start = CONFIG_LINUX_RAM_BASE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static unsigned long low_mem_sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #ifdef CONFIG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static unsigned long min_high_pfn, max_high_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static phys_addr_t high_mem_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static phys_addr_t high_mem_sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #ifdef CONFIG_DISCONTIGMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct pglist_data node_data[MAX_NUMNODES] __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) EXPORT_SYMBOL(node_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) long __init arc_get_mem_sz(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return low_mem_sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /* User can over-ride above with "mem=nnn[KkMm]" in cmdline */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static int __init setup_mem_sz(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) low_mem_sz = memparse(str, NULL) & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) /* early console might not be setup yet - it will show up later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(low_mem_sz));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) early_param("mem", setup_mem_sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) void __init early_init_dt_add_memory_arch(u64 base, u64 size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) int in_use = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (!low_mem_sz) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (base != low_mem_start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) panic("CONFIG_LINUX_RAM_BASE != DT memory { }");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) low_mem_sz = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) in_use = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) memblock_add_node(base, size, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #ifdef CONFIG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) high_mem_start = base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) high_mem_sz = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) in_use = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) memblock_add_node(base, size, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) memblock_reserve(base, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) pr_info("Memory @ %llx [%lldM] %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) base, TO_MB(size), !in_use ? "Not used":"");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) bool arch_has_descending_max_zone_pfns(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return !IS_ENABLED(CONFIG_ARC_HAS_PAE40);
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * First memory setup routine called from setup_arch()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * 1. setup swapper's mm @init_mm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * 2. Count the pages we have and setup bootmem allocator
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * 3. zone setup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) void __init setup_arch_memory(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) init_mm.start_code = (unsigned long)_text;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) init_mm.end_code = (unsigned long)_etext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) init_mm.end_data = (unsigned long)_edata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) init_mm.brk = (unsigned long)_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /* first page of system - kernel .vector starts here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) min_low_pfn = ARCH_PFN_OFFSET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) /* Last usable page of low mem */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) max_low_pfn = max_pfn = PFN_DOWN(low_mem_start + low_mem_sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) #ifdef CONFIG_FLATMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /* pfn_valid() uses this */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) max_mapnr = max_low_pfn - min_low_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) /*------------- bootmem allocator setup -----------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * seed the bootmem allocator after any DT memory node parsing or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) * "mem=xxx" cmdline overrides have potentially updated @arc_mem_sz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * Only low mem is added, otherwise we have crashes when allocating
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * mem_map[] itself. NO_BOOTMEM allocates mem_map[] at the end of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * avail memory, ending in highmem with a > 32-bit address. However
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * it then tries to memset it with a truncaed 32-bit handle, causing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * the crash
^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) memblock_reserve(CONFIG_LINUX_LINK_BASE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) __pa(_end) - CONFIG_LINUX_LINK_BASE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) #ifdef CONFIG_BLK_DEV_INITRD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (phys_initrd_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) memblock_reserve(phys_initrd_start, phys_initrd_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) initrd_start = (unsigned long)__va(phys_initrd_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) initrd_end = initrd_start + phys_initrd_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) early_init_fdt_reserve_self();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) early_init_fdt_scan_reserved_mem();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) memblock_dump_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) /*----------------- node/zones setup --------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) #ifdef CONFIG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) * Populate a new node with highmem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * On ARC (w/o PAE) HIGHMEM addresses are actually smaller (0 based)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) * than addresses in normal ala low memory (0x8000_0000 based).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) * Even with PAE, the huge peripheral space hole would waste a lot of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * mem with single mem_map[]. This warrants a mem_map per region design.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) * Thus HIGHMEM on ARC is imlemented with DISCONTIGMEM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) * DISCONTIGMEM in turns requires multiple nodes. node 0 above is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * populated with normal memory zone while node 1 only has highmem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) node_set_online(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) min_high_pfn = PFN_DOWN(high_mem_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) max_high_pfn = PFN_DOWN(high_mem_start + high_mem_sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) * max_high_pfn should be ok here for both HIGHMEM and HIGHMEM+PAE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * For HIGHMEM without PAE max_high_pfn should be less than
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * min_low_pfn to guarantee that these two regions don't overlap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * For PAE case highmem is greater than lowmem, so it is natural
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * to use max_high_pfn.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * In both cases, holes should be handled by pfn_valid().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) max_zone_pfn[ZONE_HIGHMEM] = max_high_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) high_memory = (void *)(min_high_pfn << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) kmap_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) free_area_init(max_zone_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) static void __init highmem_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) #ifdef CONFIG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) unsigned long tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) memblock_free(high_mem_start, high_mem_sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) for (tmp = min_high_pfn; tmp < max_high_pfn; tmp++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) free_highmem_page(pfn_to_page(tmp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) * mem_init - initializes memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) * Frees up bootmem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) * Calculates and displays memory available/used
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) void __init mem_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) memblock_free_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) highmem_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) mem_init_print_info(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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