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499236d9 RK |
1 | /* |
2 | * Memory subsystem initialization for Hexagon | |
3 | * | |
7c6a5df4 | 4 | * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved. |
499236d9 RK |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 and | |
8 | * only version 2 as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
18 | * 02110-1301, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/init.h> | |
22 | #include <linux/mm.h> | |
426dcd4b | 23 | #include <linux/memblock.h> |
499236d9 RK |
24 | #include <asm/atomic.h> |
25 | #include <linux/highmem.h> | |
26 | #include <asm/tlb.h> | |
27 | #include <asm/sections.h> | |
28 | #include <asm/vm_mmu.h> | |
29 | ||
30 | /* | |
31 | * Define a startpg just past the end of the kernel image and a lastpg | |
32 | * that corresponds to the end of real or simulated platform memory. | |
33 | */ | |
8f5a0b9d | 34 | #define bootmem_startpg (PFN_UP(((unsigned long) _end) - PAGE_OFFSET + PHYS_OFFSET)) |
499236d9 | 35 | |
8f5a0b9d RK |
36 | unsigned long bootmem_lastpg; /* Should be set by platform code */ |
37 | unsigned long __phys_offset; /* physical kernel offset >> 12 */ | |
499236d9 RK |
38 | |
39 | /* Set as variable to limit PMD copies */ | |
40 | int max_kernel_seg = 0x303; | |
41 | ||
499236d9 RK |
42 | /* indicate pfn's of high memory */ |
43 | unsigned long highstart_pfn, highend_pfn; | |
44 | ||
499236d9 RK |
45 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
46 | ||
47 | /* Default cache attribute for newly created page tables */ | |
48 | unsigned long _dflt_cache_att = CACHEDEF; | |
49 | ||
50 | /* | |
51 | * The current "generation" of kernel map, which should not roll | |
52 | * over until Hell freezes over. Actual bound in years needs to be | |
53 | * calculated to confirm. | |
54 | */ | |
55 | DEFINE_SPINLOCK(kmap_gen_lock); | |
56 | ||
57 | /* checkpatch says don't init this to 0. */ | |
58 | unsigned long long kmap_generation; | |
59 | ||
60 | /* | |
61 | * mem_init - initializes memory | |
62 | * | |
63 | * Frees up bootmem | |
64 | * Fixes up more stuff for HIGHMEM | |
65 | * Calculates and displays memory available/used | |
66 | */ | |
67 | void __init mem_init(void) | |
68 | { | |
69 | /* No idea where this is actually declared. Seems to evade LXR. */ | |
c6ffc5ca | 70 | memblock_free_all(); |
5dc355c1 | 71 | mem_init_print_info(NULL); |
499236d9 RK |
72 | |
73 | /* | |
74 | * To-Do: someone somewhere should wipe out the bootmem map | |
75 | * after we're done? | |
76 | */ | |
77 | ||
78 | /* | |
79 | * This can be moved to some more virtual-memory-specific | |
80 | * initialization hook at some point. Set the init_mm | |
81 | * descriptors "context" value to point to the initial | |
82 | * kernel segment table's physical address. | |
83 | */ | |
84 | init_mm.context.ptbase = __pa(init_mm.pgd); | |
85 | } | |
86 | ||
87 | /* | |
88 | * free_initmem - frees memory used by stuff declared with __init | |
89 | * | |
90 | * Todo: free pages between __init_begin and __init_end; possibly | |
91 | * some devtree related stuff as well. | |
92 | */ | |
bd721ea7 | 93 | void __ref free_initmem(void) |
499236d9 RK |
94 | { |
95 | } | |
96 | ||
97 | /* | |
98 | * free_initrd_mem - frees... initrd memory. | |
99 | * @start - start of init memory | |
100 | * @end - end of init memory | |
101 | * | |
102 | * Apparently has to be passed the address of the initrd memory. | |
103 | * | |
104 | * Wrapped by #ifdef CONFIG_BLKDEV_INITRD | |
105 | */ | |
106 | void free_initrd_mem(unsigned long start, unsigned long end) | |
107 | { | |
108 | } | |
109 | ||
110 | void sync_icache_dcache(pte_t pte) | |
111 | { | |
112 | unsigned long addr; | |
113 | struct page *page; | |
114 | ||
115 | page = pte_page(pte); | |
116 | addr = (unsigned long) page_address(page); | |
117 | ||
118 | __vmcache_idsync(addr, PAGE_SIZE); | |
119 | } | |
120 | ||
121 | /* | |
122 | * In order to set up page allocator "nodes", | |
123 | * somebody has to call free_area_init() for UMA. | |
124 | * | |
125 | * In this mode, we only have one pg_data_t | |
126 | * structure: contig_mem_data. | |
127 | */ | |
128 | void __init paging_init(void) | |
129 | { | |
130 | unsigned long zones_sizes[MAX_NR_ZONES] = {0, }; | |
131 | ||
132 | /* | |
133 | * This is not particularly well documented anywhere, but | |
134 | * give ZONE_NORMAL all the memory, including the big holes | |
135 | * left by the kernel+bootmem_map which are already left as reserved | |
136 | * in the bootmem_map; free_area_init should see those bits and | |
137 | * adjust accordingly. | |
138 | */ | |
139 | ||
140 | zones_sizes[ZONE_NORMAL] = max_low_pfn; | |
141 | ||
142 | free_area_init(zones_sizes); /* sets up the zonelists and mem_map */ | |
143 | ||
144 | /* | |
145 | * Start of high memory area. Will probably need something more | |
146 | * fancy if we... get more fancy. | |
147 | */ | |
148 | high_memory = (void *)((bootmem_lastpg + 1) << PAGE_SHIFT); | |
149 | } | |
150 | ||
151 | #ifndef DMA_RESERVE | |
152 | #define DMA_RESERVE (4) | |
153 | #endif | |
154 | ||
155 | #define DMA_CHUNKSIZE (1<<22) | |
156 | #define DMA_RESERVED_BYTES (DMA_RESERVE * DMA_CHUNKSIZE) | |
157 | ||
158 | /* | |
159 | * Pick out the memory size. We look for mem=size, | |
160 | * where size is "size[KkMm]" | |
161 | */ | |
162 | static int __init early_mem(char *p) | |
163 | { | |
164 | unsigned long size; | |
165 | char *endp; | |
166 | ||
167 | size = memparse(p, &endp); | |
168 | ||
169 | bootmem_lastpg = PFN_DOWN(size); | |
170 | ||
171 | return 0; | |
172 | } | |
173 | early_param("mem", early_mem); | |
174 | ||
175 | size_t hexagon_coherent_pool_size = (size_t) (DMA_RESERVE << 22); | |
176 | ||
177 | void __init setup_arch_memory(void) | |
178 | { | |
499236d9 RK |
179 | /* XXX Todo: this probably should be cleaned up */ |
180 | u32 *segtable = (u32 *) &swapper_pg_dir[0]; | |
181 | u32 *segtable_end; | |
182 | ||
183 | /* | |
184 | * Set up boot memory allocator | |
185 | * | |
186 | * The Gorman book also talks about these functions. | |
187 | * This needs to change for highmem setups. | |
188 | */ | |
189 | ||
8f5a0b9d RK |
190 | /* Prior to this, bootmem_lastpg is actually mem size */ |
191 | bootmem_lastpg += ARCH_PFN_OFFSET; | |
192 | ||
499236d9 RK |
193 | /* Memory size needs to be a multiple of 16M */ |
194 | bootmem_lastpg = PFN_DOWN((bootmem_lastpg << PAGE_SHIFT) & | |
195 | ~((BIG_KERNEL_PAGE_SIZE) - 1)); | |
196 | ||
426dcd4b MR |
197 | memblock_add(PHYS_OFFSET, |
198 | (bootmem_lastpg - ARCH_PFN_OFFSET) << PAGE_SHIFT); | |
199 | ||
200 | /* Reserve kernel text/data/bss */ | |
201 | memblock_reserve(PHYS_OFFSET, | |
202 | (bootmem_startpg - ARCH_PFN_OFFSET) << PAGE_SHIFT); | |
499236d9 RK |
203 | /* |
204 | * Reserve the top DMA_RESERVE bytes of RAM for DMA (uncached) | |
205 | * memory allocation | |
206 | */ | |
8f5a0b9d RK |
207 | max_low_pfn = bootmem_lastpg - PFN_DOWN(DMA_RESERVED_BYTES); |
208 | min_low_pfn = ARCH_PFN_OFFSET; | |
426dcd4b | 209 | memblock_reserve(PFN_PHYS(max_low_pfn), DMA_RESERVED_BYTES); |
499236d9 RK |
210 | |
211 | printk(KERN_INFO "bootmem_startpg: 0x%08lx\n", bootmem_startpg); | |
212 | printk(KERN_INFO "bootmem_lastpg: 0x%08lx\n", bootmem_lastpg); | |
8f5a0b9d | 213 | printk(KERN_INFO "min_low_pfn: 0x%08lx\n", min_low_pfn); |
499236d9 RK |
214 | printk(KERN_INFO "max_low_pfn: 0x%08lx\n", max_low_pfn); |
215 | ||
216 | /* | |
217 | * The default VM page tables (will be) populated with | |
218 | * VA=PA+PAGE_OFFSET mapping. We go in and invalidate entries | |
219 | * higher than what we have memory for. | |
220 | */ | |
221 | ||
222 | /* this is pointer arithmetic; each entry covers 4MB */ | |
223 | segtable = segtable + (PAGE_OFFSET >> 22); | |
224 | ||
225 | /* this actually only goes to the end of the first gig */ | |
226 | segtable_end = segtable + (1<<(30-22)); | |
227 | ||
8f5a0b9d RK |
228 | /* |
229 | * Move forward to the start of empty pages; take into account | |
230 | * phys_offset shift. | |
231 | */ | |
499236d9 | 232 | |
8f5a0b9d | 233 | segtable += (bootmem_lastpg-ARCH_PFN_OFFSET)>>(22-PAGE_SHIFT); |
499236d9 | 234 | { |
8f5a0b9d | 235 | int i; |
499236d9 | 236 | |
8f5a0b9d RK |
237 | for (i = 1 ; i <= DMA_RESERVE ; i++) |
238 | segtable[-i] = ((segtable[-i] & __HVM_PTE_PGMASK_4MB) | |
499236d9 RK |
239 | | __HVM_PTE_R | __HVM_PTE_W | __HVM_PTE_X |
240 | | __HEXAGON_C_UNC << 6 | |
241 | | __HVM_PDE_S_4MB); | |
242 | } | |
243 | ||
244 | printk(KERN_INFO "clearing segtable from %p to %p\n", segtable, | |
245 | segtable_end); | |
246 | while (segtable < (segtable_end-8)) | |
247 | *(segtable++) = __HVM_PDE_S_INVALID; | |
248 | /* stop the pointer at the device I/O 4MB page */ | |
249 | ||
250 | printk(KERN_INFO "segtable = %p (should be equal to _K_io_map)\n", | |
251 | segtable); | |
252 | ||
253 | #if 0 | |
254 | /* Other half of the early device table from vm_init_segtable. */ | |
255 | printk(KERN_INFO "&_K_init_devicetable = 0x%08x\n", | |
256 | (unsigned long) _K_init_devicetable-PAGE_OFFSET); | |
257 | *segtable = ((u32) (unsigned long) _K_init_devicetable-PAGE_OFFSET) | | |
258 | __HVM_PDE_S_4KB; | |
259 | printk(KERN_INFO "*segtable = 0x%08x\n", *segtable); | |
260 | #endif | |
261 | ||
499236d9 RK |
262 | /* |
263 | * The bootmem allocator seemingly just lives to feed memory | |
264 | * to the paging system | |
265 | */ | |
266 | printk(KERN_INFO "PAGE_SIZE=%lu\n", PAGE_SIZE); | |
267 | paging_init(); /* See Gorman Book, 2.3 */ | |
268 | ||
269 | /* | |
270 | * At this point, the page allocator is kind of initialized, but | |
271 | * apparently no pages are available (just like with the bootmem | |
272 | * allocator), and need to be freed themselves via mem_init(), | |
273 | * which is called by start_kernel() later on in the process | |
274 | */ | |
275 | } |