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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
commit | 76cb841cb886eef6b3bee341a2266c76578724ad (patch) | |
tree | f5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /arch/arc/mm/init.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 4.19.249.upstream/4.19.249upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arc/mm/init.c')
-rw-r--r-- | arch/arc/mm/init.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c new file mode 100644 index 000000000..f890b2f9f --- /dev/null +++ b/arch/arc/mm/init.c @@ -0,0 +1,239 @@ +/* + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/bootmem.h> +#include <linux/memblock.h> +#ifdef CONFIG_BLK_DEV_INITRD +#include <linux/initrd.h> +#endif +#include <linux/of_fdt.h> +#include <linux/swap.h> +#include <linux/module.h> +#include <linux/highmem.h> +#include <asm/page.h> +#include <asm/pgalloc.h> +#include <asm/sections.h> +#include <asm/arcregs.h> + +pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE); +char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE); +EXPORT_SYMBOL(empty_zero_page); + +static const unsigned long low_mem_start = CONFIG_LINUX_RAM_BASE; +static unsigned long low_mem_sz; + +#ifdef CONFIG_HIGHMEM +static unsigned long min_high_pfn, max_high_pfn; +static u64 high_mem_start; +static u64 high_mem_sz; +#endif + +#ifdef CONFIG_DISCONTIGMEM +struct pglist_data node_data[MAX_NUMNODES] __read_mostly; +EXPORT_SYMBOL(node_data); +#endif + +long __init arc_get_mem_sz(void) +{ + return low_mem_sz; +} + +/* User can over-ride above with "mem=nnn[KkMm]" in cmdline */ +static int __init setup_mem_sz(char *str) +{ + low_mem_sz = memparse(str, NULL) & PAGE_MASK; + + /* early console might not be setup yet - it will show up later */ + pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(low_mem_sz)); + + return 0; +} +early_param("mem", setup_mem_sz); + +void __init early_init_dt_add_memory_arch(u64 base, u64 size) +{ + int in_use = 0; + + if (!low_mem_sz) { + if (base != low_mem_start) + panic("CONFIG_LINUX_RAM_BASE != DT memory { }"); + + low_mem_sz = size; + in_use = 1; + } else { +#ifdef CONFIG_HIGHMEM + high_mem_start = base; + high_mem_sz = size; + in_use = 1; +#endif + } + + pr_info("Memory @ %llx [%lldM] %s\n", + base, TO_MB(size), !in_use ? "Not used":""); +} + +#ifdef CONFIG_BLK_DEV_INITRD +static int __init early_initrd(char *p) +{ + unsigned long start, size; + char *endp; + + start = memparse(p, &endp); + if (*endp == ',') { + size = memparse(endp + 1, NULL); + + initrd_start = (unsigned long)__va(start); + initrd_end = (unsigned long)__va(start + size); + } + return 0; +} +early_param("initrd", early_initrd); +#endif + +/* + * First memory setup routine called from setup_arch() + * 1. setup swapper's mm @init_mm + * 2. Count the pages we have and setup bootmem allocator + * 3. zone setup + */ +void __init setup_arch_memory(void) +{ + unsigned long zones_size[MAX_NR_ZONES]; + unsigned long zones_holes[MAX_NR_ZONES]; + + init_mm.start_code = (unsigned long)_text; + init_mm.end_code = (unsigned long)_etext; + init_mm.end_data = (unsigned long)_edata; + init_mm.brk = (unsigned long)_end; + + /* first page of system - kernel .vector starts here */ + min_low_pfn = ARCH_PFN_OFFSET; + + /* Last usable page of low mem */ + max_low_pfn = max_pfn = PFN_DOWN(low_mem_start + low_mem_sz); + +#ifdef CONFIG_FLATMEM + /* pfn_valid() uses this */ + max_mapnr = max_low_pfn - min_low_pfn; +#endif + + /*------------- bootmem allocator setup -----------------------*/ + + /* + * seed the bootmem allocator after any DT memory node parsing or + * "mem=xxx" cmdline overrides have potentially updated @arc_mem_sz + * + * Only low mem is added, otherwise we have crashes when allocating + * mem_map[] itself. NO_BOOTMEM allocates mem_map[] at the end of + * avail memory, ending in highmem with a > 32-bit address. However + * it then tries to memset it with a truncaed 32-bit handle, causing + * the crash + */ + + memblock_add_node(low_mem_start, low_mem_sz, 0); + memblock_reserve(CONFIG_LINUX_LINK_BASE, + __pa(_end) - CONFIG_LINUX_LINK_BASE); + +#ifdef CONFIG_BLK_DEV_INITRD + if (initrd_start) + memblock_reserve(__pa(initrd_start), initrd_end - initrd_start); +#endif + + early_init_fdt_reserve_self(); + early_init_fdt_scan_reserved_mem(); + + memblock_dump_all(); + + /*----------------- node/zones setup --------------------------*/ + memset(zones_size, 0, sizeof(zones_size)); + memset(zones_holes, 0, sizeof(zones_holes)); + + zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn; + zones_holes[ZONE_NORMAL] = 0; + + /* + * We can't use the helper free_area_init(zones[]) because it uses + * PAGE_OFFSET to compute the @min_low_pfn which would be wrong + * when our kernel doesn't start at PAGE_OFFSET, i.e. + * PAGE_OFFSET != CONFIG_LINUX_RAM_BASE + */ + free_area_init_node(0, /* node-id */ + zones_size, /* num pages per zone */ + min_low_pfn, /* first pfn of node */ + zones_holes); /* holes */ + +#ifdef CONFIG_HIGHMEM + /* + * Populate a new node with highmem + * + * On ARC (w/o PAE) HIGHMEM addresses are actually smaller (0 based) + * than addresses in normal ala low memory (0x8000_0000 based). + * Even with PAE, the huge peripheral space hole would waste a lot of + * mem with single mem_map[]. This warrants a mem_map per region design. + * Thus HIGHMEM on ARC is imlemented with DISCONTIGMEM. + * + * DISCONTIGMEM in turns requires multiple nodes. node 0 above is + * populated with normal memory zone while node 1 only has highmem + */ + node_set_online(1); + + min_high_pfn = PFN_DOWN(high_mem_start); + max_high_pfn = PFN_DOWN(high_mem_start + high_mem_sz); + + zones_size[ZONE_NORMAL] = 0; + zones_holes[ZONE_NORMAL] = 0; + + zones_size[ZONE_HIGHMEM] = max_high_pfn - min_high_pfn; + zones_holes[ZONE_HIGHMEM] = 0; + + free_area_init_node(1, /* node-id */ + zones_size, /* num pages per zone */ + min_high_pfn, /* first pfn of node */ + zones_holes); /* holes */ + + high_memory = (void *)(min_high_pfn << PAGE_SHIFT); + kmap_init(); +#endif +} + +/* + * mem_init - initializes memory + * + * Frees up bootmem + * Calculates and displays memory available/used + */ +void __init mem_init(void) +{ +#ifdef CONFIG_HIGHMEM + unsigned long tmp; + + reset_all_zones_managed_pages(); + for (tmp = min_high_pfn; tmp < max_high_pfn; tmp++) + free_highmem_page(pfn_to_page(tmp)); +#endif + + free_all_bootmem(); + mem_init_print_info(NULL); +} + +/* + * free_initmem: Free all the __init memory. + */ +void __ref free_initmem(void) +{ + free_initmem_default(-1); +} + +#ifdef CONFIG_BLK_DEV_INITRD +void __init free_initrd_mem(unsigned long start, unsigned long end) +{ + free_reserved_area((void *)start, (void *)end, -1, "initrd"); +} +#endif |