Thomas Gleixner | 08dbd0f | 2019-05-29 07:12:41 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 2 | /* |
| 3 | * Memory subsystem initialization for Hexagon |
| 4 | * |
Richard Kuo | 7c6a5df | 2013-03-28 20:45:40 -0500 | [diff] [blame] | 5 | * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved. |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 6 | */ |
| 7 | |
| 8 | #include <linux/init.h> |
| 9 | #include <linux/mm.h> |
Mike Rapoport | 426dcd4 | 2018-10-26 15:04:44 -0700 | [diff] [blame] | 10 | #include <linux/memblock.h> |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 11 | #include <asm/atomic.h> |
| 12 | #include <linux/highmem.h> |
| 13 | #include <asm/tlb.h> |
| 14 | #include <asm/sections.h> |
| 15 | #include <asm/vm_mmu.h> |
| 16 | |
| 17 | /* |
| 18 | * Define a startpg just past the end of the kernel image and a lastpg |
| 19 | * that corresponds to the end of real or simulated platform memory. |
| 20 | */ |
Richard Kuo | 8f5a0b9d | 2013-03-22 16:05:40 -0500 | [diff] [blame] | 21 | #define bootmem_startpg (PFN_UP(((unsigned long) _end) - PAGE_OFFSET + PHYS_OFFSET)) |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 22 | |
Richard Kuo | 8f5a0b9d | 2013-03-22 16:05:40 -0500 | [diff] [blame] | 23 | unsigned long bootmem_lastpg; /* Should be set by platform code */ |
| 24 | unsigned long __phys_offset; /* physical kernel offset >> 12 */ |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 25 | |
| 26 | /* Set as variable to limit PMD copies */ |
| 27 | int max_kernel_seg = 0x303; |
| 28 | |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 29 | /* indicate pfn's of high memory */ |
| 30 | unsigned long highstart_pfn, highend_pfn; |
| 31 | |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 32 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
| 33 | |
| 34 | /* Default cache attribute for newly created page tables */ |
| 35 | unsigned long _dflt_cache_att = CACHEDEF; |
| 36 | |
| 37 | /* |
| 38 | * The current "generation" of kernel map, which should not roll |
| 39 | * over until Hell freezes over. Actual bound in years needs to be |
| 40 | * calculated to confirm. |
| 41 | */ |
| 42 | DEFINE_SPINLOCK(kmap_gen_lock); |
| 43 | |
| 44 | /* checkpatch says don't init this to 0. */ |
| 45 | unsigned long long kmap_generation; |
| 46 | |
| 47 | /* |
| 48 | * mem_init - initializes memory |
| 49 | * |
| 50 | * Frees up bootmem |
| 51 | * Fixes up more stuff for HIGHMEM |
| 52 | * Calculates and displays memory available/used |
| 53 | */ |
| 54 | void __init mem_init(void) |
| 55 | { |
| 56 | /* No idea where this is actually declared. Seems to evade LXR. */ |
Mike Rapoport | c6ffc5c | 2018-10-30 15:09:30 -0700 | [diff] [blame] | 57 | memblock_free_all(); |
Jiang Liu | 5dc355c | 2013-07-03 15:03:57 -0700 | [diff] [blame] | 58 | mem_init_print_info(NULL); |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 59 | |
| 60 | /* |
| 61 | * To-Do: someone somewhere should wipe out the bootmem map |
| 62 | * after we're done? |
| 63 | */ |
| 64 | |
| 65 | /* |
| 66 | * This can be moved to some more virtual-memory-specific |
| 67 | * initialization hook at some point. Set the init_mm |
| 68 | * descriptors "context" value to point to the initial |
| 69 | * kernel segment table's physical address. |
| 70 | */ |
| 71 | init_mm.context.ptbase = __pa(init_mm.pgd); |
| 72 | } |
| 73 | |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 74 | void sync_icache_dcache(pte_t pte) |
| 75 | { |
| 76 | unsigned long addr; |
| 77 | struct page *page; |
| 78 | |
| 79 | page = pte_page(pte); |
| 80 | addr = (unsigned long) page_address(page); |
| 81 | |
| 82 | __vmcache_idsync(addr, PAGE_SIZE); |
| 83 | } |
| 84 | |
| 85 | /* |
| 86 | * In order to set up page allocator "nodes", |
| 87 | * somebody has to call free_area_init() for UMA. |
| 88 | * |
| 89 | * In this mode, we only have one pg_data_t |
| 90 | * structure: contig_mem_data. |
| 91 | */ |
| 92 | void __init paging_init(void) |
| 93 | { |
Mike Rapoport | fa3354e | 2020-06-03 15:57:06 -0700 | [diff] [blame] | 94 | unsigned long max_zone_pfn[MAX_NR_ZONES] = {0, }; |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 95 | |
| 96 | /* |
| 97 | * This is not particularly well documented anywhere, but |
| 98 | * give ZONE_NORMAL all the memory, including the big holes |
| 99 | * left by the kernel+bootmem_map which are already left as reserved |
| 100 | * in the bootmem_map; free_area_init should see those bits and |
| 101 | * adjust accordingly. |
| 102 | */ |
| 103 | |
Mike Rapoport | fa3354e | 2020-06-03 15:57:06 -0700 | [diff] [blame] | 104 | max_zone_pfn[ZONE_NORMAL] = max_low_pfn; |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 105 | |
Mike Rapoport | fa3354e | 2020-06-03 15:57:06 -0700 | [diff] [blame] | 106 | free_area_init(max_zone_pfn); /* sets up the zonelists and mem_map */ |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 107 | |
| 108 | /* |
| 109 | * Start of high memory area. Will probably need something more |
| 110 | * fancy if we... get more fancy. |
| 111 | */ |
| 112 | high_memory = (void *)((bootmem_lastpg + 1) << PAGE_SHIFT); |
| 113 | } |
| 114 | |
| 115 | #ifndef DMA_RESERVE |
| 116 | #define DMA_RESERVE (4) |
| 117 | #endif |
| 118 | |
| 119 | #define DMA_CHUNKSIZE (1<<22) |
| 120 | #define DMA_RESERVED_BYTES (DMA_RESERVE * DMA_CHUNKSIZE) |
| 121 | |
| 122 | /* |
| 123 | * Pick out the memory size. We look for mem=size, |
| 124 | * where size is "size[KkMm]" |
| 125 | */ |
| 126 | static int __init early_mem(char *p) |
| 127 | { |
| 128 | unsigned long size; |
| 129 | char *endp; |
| 130 | |
| 131 | size = memparse(p, &endp); |
| 132 | |
| 133 | bootmem_lastpg = PFN_DOWN(size); |
| 134 | |
| 135 | return 0; |
| 136 | } |
| 137 | early_param("mem", early_mem); |
| 138 | |
| 139 | size_t hexagon_coherent_pool_size = (size_t) (DMA_RESERVE << 22); |
| 140 | |
| 141 | void __init setup_arch_memory(void) |
| 142 | { |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 143 | /* XXX Todo: this probably should be cleaned up */ |
| 144 | u32 *segtable = (u32 *) &swapper_pg_dir[0]; |
| 145 | u32 *segtable_end; |
| 146 | |
| 147 | /* |
| 148 | * Set up boot memory allocator |
| 149 | * |
| 150 | * The Gorman book also talks about these functions. |
| 151 | * This needs to change for highmem setups. |
| 152 | */ |
| 153 | |
Richard Kuo | 8f5a0b9d | 2013-03-22 16:05:40 -0500 | [diff] [blame] | 154 | /* Prior to this, bootmem_lastpg is actually mem size */ |
| 155 | bootmem_lastpg += ARCH_PFN_OFFSET; |
| 156 | |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 157 | /* Memory size needs to be a multiple of 16M */ |
| 158 | bootmem_lastpg = PFN_DOWN((bootmem_lastpg << PAGE_SHIFT) & |
| 159 | ~((BIG_KERNEL_PAGE_SIZE) - 1)); |
| 160 | |
Mike Rapoport | 426dcd4 | 2018-10-26 15:04:44 -0700 | [diff] [blame] | 161 | memblock_add(PHYS_OFFSET, |
| 162 | (bootmem_lastpg - ARCH_PFN_OFFSET) << PAGE_SHIFT); |
| 163 | |
| 164 | /* Reserve kernel text/data/bss */ |
| 165 | memblock_reserve(PHYS_OFFSET, |
| 166 | (bootmem_startpg - ARCH_PFN_OFFSET) << PAGE_SHIFT); |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 167 | /* |
| 168 | * Reserve the top DMA_RESERVE bytes of RAM for DMA (uncached) |
| 169 | * memory allocation |
| 170 | */ |
Richard Kuo | 8f5a0b9d | 2013-03-22 16:05:40 -0500 | [diff] [blame] | 171 | max_low_pfn = bootmem_lastpg - PFN_DOWN(DMA_RESERVED_BYTES); |
| 172 | min_low_pfn = ARCH_PFN_OFFSET; |
Mike Rapoport | 426dcd4 | 2018-10-26 15:04:44 -0700 | [diff] [blame] | 173 | memblock_reserve(PFN_PHYS(max_low_pfn), DMA_RESERVED_BYTES); |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 174 | |
| 175 | printk(KERN_INFO "bootmem_startpg: 0x%08lx\n", bootmem_startpg); |
| 176 | printk(KERN_INFO "bootmem_lastpg: 0x%08lx\n", bootmem_lastpg); |
Richard Kuo | 8f5a0b9d | 2013-03-22 16:05:40 -0500 | [diff] [blame] | 177 | printk(KERN_INFO "min_low_pfn: 0x%08lx\n", min_low_pfn); |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 178 | printk(KERN_INFO "max_low_pfn: 0x%08lx\n", max_low_pfn); |
| 179 | |
| 180 | /* |
| 181 | * The default VM page tables (will be) populated with |
| 182 | * VA=PA+PAGE_OFFSET mapping. We go in and invalidate entries |
| 183 | * higher than what we have memory for. |
| 184 | */ |
| 185 | |
| 186 | /* this is pointer arithmetic; each entry covers 4MB */ |
| 187 | segtable = segtable + (PAGE_OFFSET >> 22); |
| 188 | |
| 189 | /* this actually only goes to the end of the first gig */ |
| 190 | segtable_end = segtable + (1<<(30-22)); |
| 191 | |
Richard Kuo | 8f5a0b9d | 2013-03-22 16:05:40 -0500 | [diff] [blame] | 192 | /* |
| 193 | * Move forward to the start of empty pages; take into account |
| 194 | * phys_offset shift. |
| 195 | */ |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 196 | |
Richard Kuo | 8f5a0b9d | 2013-03-22 16:05:40 -0500 | [diff] [blame] | 197 | segtable += (bootmem_lastpg-ARCH_PFN_OFFSET)>>(22-PAGE_SHIFT); |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 198 | { |
Richard Kuo | 8f5a0b9d | 2013-03-22 16:05:40 -0500 | [diff] [blame] | 199 | int i; |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 200 | |
Richard Kuo | 8f5a0b9d | 2013-03-22 16:05:40 -0500 | [diff] [blame] | 201 | for (i = 1 ; i <= DMA_RESERVE ; i++) |
| 202 | segtable[-i] = ((segtable[-i] & __HVM_PTE_PGMASK_4MB) |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 203 | | __HVM_PTE_R | __HVM_PTE_W | __HVM_PTE_X |
| 204 | | __HEXAGON_C_UNC << 6 |
| 205 | | __HVM_PDE_S_4MB); |
| 206 | } |
| 207 | |
| 208 | printk(KERN_INFO "clearing segtable from %p to %p\n", segtable, |
| 209 | segtable_end); |
| 210 | while (segtable < (segtable_end-8)) |
| 211 | *(segtable++) = __HVM_PDE_S_INVALID; |
| 212 | /* stop the pointer at the device I/O 4MB page */ |
| 213 | |
| 214 | printk(KERN_INFO "segtable = %p (should be equal to _K_io_map)\n", |
| 215 | segtable); |
| 216 | |
| 217 | #if 0 |
| 218 | /* Other half of the early device table from vm_init_segtable. */ |
| 219 | printk(KERN_INFO "&_K_init_devicetable = 0x%08x\n", |
| 220 | (unsigned long) _K_init_devicetable-PAGE_OFFSET); |
| 221 | *segtable = ((u32) (unsigned long) _K_init_devicetable-PAGE_OFFSET) | |
| 222 | __HVM_PDE_S_4KB; |
| 223 | printk(KERN_INFO "*segtable = 0x%08x\n", *segtable); |
| 224 | #endif |
| 225 | |
| 226 | /* |
Richard Kuo | 499236d | 2011-10-31 18:54:08 -0500 | [diff] [blame] | 227 | * The bootmem allocator seemingly just lives to feed memory |
| 228 | * to the paging system |
| 229 | */ |
| 230 | printk(KERN_INFO "PAGE_SIZE=%lu\n", PAGE_SIZE); |
| 231 | paging_init(); /* See Gorman Book, 2.3 */ |
| 232 | |
| 233 | /* |
| 234 | * At this point, the page allocator is kind of initialized, but |
| 235 | * apparently no pages are available (just like with the bootmem |
| 236 | * allocator), and need to be freed themselves via mem_init(), |
| 237 | * which is called by start_kernel() later on in the process |
| 238 | */ |
| 239 | } |