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1/*
2 * Memory subsystem initialization for Hexagon
3 *
4 * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
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>
23#include <linux/bootmem.h>
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 */
34#define bootmem_startpg (PFN_UP(((unsigned long) _end) - PAGE_OFFSET + PHYS_OFFSET))
35
36unsigned long bootmem_lastpg; /* Should be set by platform code */
37unsigned long __phys_offset; /* physical kernel offset >> 12 */
38
39/* Set as variable to limit PMD copies */
40int max_kernel_seg = 0x303;
41
42/* think this should be (page_size-1) the way it's used...*/
43unsigned long zero_page_mask;
44
45/* indicate pfn's of high memory */
46unsigned long highstart_pfn, highend_pfn;
47
48DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
49
50/* Default cache attribute for newly created page tables */
51unsigned long _dflt_cache_att = CACHEDEF;
52
53/*
54 * The current "generation" of kernel map, which should not roll
55 * over until Hell freezes over. Actual bound in years needs to be
56 * calculated to confirm.
57 */
58DEFINE_SPINLOCK(kmap_gen_lock);
59
60/* checkpatch says don't init this to 0. */
61unsigned long long kmap_generation;
62
63/*
64 * mem_init - initializes memory
65 *
66 * Frees up bootmem
67 * Fixes up more stuff for HIGHMEM
68 * Calculates and displays memory available/used
69 */
70void __init mem_init(void)
71{
72 /* No idea where this is actually declared. Seems to evade LXR. */
73 free_all_bootmem();
74 mem_init_print_info(NULL);
75
76 /*
77 * To-Do: someone somewhere should wipe out the bootmem map
78 * after we're done?
79 */
80
81 /*
82 * This can be moved to some more virtual-memory-specific
83 * initialization hook at some point. Set the init_mm
84 * descriptors "context" value to point to the initial
85 * kernel segment table's physical address.
86 */
87 init_mm.context.ptbase = __pa(init_mm.pgd);
88}
89
90/*
91 * free_initmem - frees memory used by stuff declared with __init
92 *
93 * Todo: free pages between __init_begin and __init_end; possibly
94 * some devtree related stuff as well.
95 */
96void __ref free_initmem(void)
97{
98}
99
100/*
101 * free_initrd_mem - frees... initrd memory.
102 * @start - start of init memory
103 * @end - end of init memory
104 *
105 * Apparently has to be passed the address of the initrd memory.
106 *
107 * Wrapped by #ifdef CONFIG_BLKDEV_INITRD
108 */
109void free_initrd_mem(unsigned long start, unsigned long end)
110{
111}
112
113void sync_icache_dcache(pte_t pte)
114{
115 unsigned long addr;
116 struct page *page;
117
118 page = pte_page(pte);
119 addr = (unsigned long) page_address(page);
120
121 __vmcache_idsync(addr, PAGE_SIZE);
122}
123
124/*
125 * In order to set up page allocator "nodes",
126 * somebody has to call free_area_init() for UMA.
127 *
128 * In this mode, we only have one pg_data_t
129 * structure: contig_mem_data.
130 */
131void __init paging_init(void)
132{
133 unsigned long zones_sizes[MAX_NR_ZONES] = {0, };
134
135 /*
136 * This is not particularly well documented anywhere, but
137 * give ZONE_NORMAL all the memory, including the big holes
138 * left by the kernel+bootmem_map which are already left as reserved
139 * in the bootmem_map; free_area_init should see those bits and
140 * adjust accordingly.
141 */
142
143 zones_sizes[ZONE_NORMAL] = max_low_pfn;
144
145 free_area_init(zones_sizes); /* sets up the zonelists and mem_map */
146
147 /*
148 * Start of high memory area. Will probably need something more
149 * fancy if we... get more fancy.
150 */
151 high_memory = (void *)((bootmem_lastpg + 1) << PAGE_SHIFT);
152}
153
154#ifndef DMA_RESERVE
155#define DMA_RESERVE (4)
156#endif
157
158#define DMA_CHUNKSIZE (1<<22)
159#define DMA_RESERVED_BYTES (DMA_RESERVE * DMA_CHUNKSIZE)
160
161/*
162 * Pick out the memory size. We look for mem=size,
163 * where size is "size[KkMm]"
164 */
165static int __init early_mem(char *p)
166{
167 unsigned long size;
168 char *endp;
169
170 size = memparse(p, &endp);
171
172 bootmem_lastpg = PFN_DOWN(size);
173
174 return 0;
175}
176early_param("mem", early_mem);
177
178size_t hexagon_coherent_pool_size = (size_t) (DMA_RESERVE << 22);
179
180void __init setup_arch_memory(void)
181{
182 int bootmap_size;
183 /* XXX Todo: this probably should be cleaned up */
184 u32 *segtable = (u32 *) &swapper_pg_dir[0];
185 u32 *segtable_end;
186
187 /*
188 * Set up boot memory allocator
189 *
190 * The Gorman book also talks about these functions.
191 * This needs to change for highmem setups.
192 */
193
194 /* Prior to this, bootmem_lastpg is actually mem size */
195 bootmem_lastpg += ARCH_PFN_OFFSET;
196
197 /* Memory size needs to be a multiple of 16M */
198 bootmem_lastpg = PFN_DOWN((bootmem_lastpg << PAGE_SHIFT) &
199 ~((BIG_KERNEL_PAGE_SIZE) - 1));
200
201 /*
202 * Reserve the top DMA_RESERVE bytes of RAM for DMA (uncached)
203 * memory allocation
204 */
205
206 max_low_pfn = bootmem_lastpg - PFN_DOWN(DMA_RESERVED_BYTES);
207 min_low_pfn = ARCH_PFN_OFFSET;
208 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmem_startpg, min_low_pfn, max_low_pfn);
209
210 printk(KERN_INFO "bootmem_startpg: 0x%08lx\n", bootmem_startpg);
211 printk(KERN_INFO "bootmem_lastpg: 0x%08lx\n", bootmem_lastpg);
212 printk(KERN_INFO "bootmap_size: %d\n", bootmap_size);
213 printk(KERN_INFO "min_low_pfn: 0x%08lx\n", min_low_pfn);
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
228 /*
229 * Move forward to the start of empty pages; take into account
230 * phys_offset shift.
231 */
232
233 segtable += (bootmem_lastpg-ARCH_PFN_OFFSET)>>(22-PAGE_SHIFT);
234 {
235 int i;
236
237 for (i = 1 ; i <= DMA_RESERVE ; i++)
238 segtable[-i] = ((segtable[-i] & __HVM_PTE_PGMASK_4MB)
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
262 /*
263 * Free all the memory that wasn't taken up by the bootmap, the DMA
264 * reserve, or kernel itself.
265 */
266 free_bootmem(PFN_PHYS(bootmem_startpg) + bootmap_size,
267 PFN_PHYS(bootmem_lastpg - bootmem_startpg) - bootmap_size -
268 DMA_RESERVED_BYTES);
269
270 /*
271 * The bootmem allocator seemingly just lives to feed memory
272 * to the paging system
273 */
274 printk(KERN_INFO "PAGE_SIZE=%lu\n", PAGE_SIZE);
275 paging_init(); /* See Gorman Book, 2.3 */
276
277 /*
278 * At this point, the page allocator is kind of initialized, but
279 * apparently no pages are available (just like with the bootmem
280 * allocator), and need to be freed themselves via mem_init(),
281 * which is called by start_kernel() later on in the process
282 */
283}
1/*
2 * Memory subsystem initialization for Hexagon
3 *
4 * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
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>
23#include <linux/bootmem.h>
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 */
34#define bootmem_startpg (PFN_UP(((unsigned long) _end) - PAGE_OFFSET + PHYS_OFFSET))
35
36unsigned long bootmem_lastpg; /* Should be set by platform code */
37unsigned long __phys_offset; /* physical kernel offset >> 12 */
38
39/* Set as variable to limit PMD copies */
40int max_kernel_seg = 0x303;
41
42/* think this should be (page_size-1) the way it's used...*/
43unsigned long zero_page_mask;
44
45/* indicate pfn's of high memory */
46unsigned long highstart_pfn, highend_pfn;
47
48DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
49
50/* Default cache attribute for newly created page tables */
51unsigned long _dflt_cache_att = CACHEDEF;
52
53/*
54 * The current "generation" of kernel map, which should not roll
55 * over until Hell freezes over. Actual bound in years needs to be
56 * calculated to confirm.
57 */
58DEFINE_SPINLOCK(kmap_gen_lock);
59
60/* checkpatch says don't init this to 0. */
61unsigned long long kmap_generation;
62
63/*
64 * mem_init - initializes memory
65 *
66 * Frees up bootmem
67 * Fixes up more stuff for HIGHMEM
68 * Calculates and displays memory available/used
69 */
70void __init mem_init(void)
71{
72 /* No idea where this is actually declared. Seems to evade LXR. */
73 free_all_bootmem();
74 mem_init_print_info(NULL);
75
76 /*
77 * To-Do: someone somewhere should wipe out the bootmem map
78 * after we're done?
79 */
80
81 /*
82 * This can be moved to some more virtual-memory-specific
83 * initialization hook at some point. Set the init_mm
84 * descriptors "context" value to point to the initial
85 * kernel segment table's physical address.
86 */
87 init_mm.context.ptbase = __pa(init_mm.pgd);
88}
89
90/*
91 * free_initmem - frees memory used by stuff declared with __init
92 *
93 * Todo: free pages between __init_begin and __init_end; possibly
94 * some devtree related stuff as well.
95 */
96void __init_refok free_initmem(void)
97{
98}
99
100/*
101 * free_initrd_mem - frees... initrd memory.
102 * @start - start of init memory
103 * @end - end of init memory
104 *
105 * Apparently has to be passed the address of the initrd memory.
106 *
107 * Wrapped by #ifdef CONFIG_BLKDEV_INITRD
108 */
109void free_initrd_mem(unsigned long start, unsigned long end)
110{
111}
112
113void sync_icache_dcache(pte_t pte)
114{
115 unsigned long addr;
116 struct page *page;
117
118 page = pte_page(pte);
119 addr = (unsigned long) page_address(page);
120
121 __vmcache_idsync(addr, PAGE_SIZE);
122}
123
124/*
125 * In order to set up page allocator "nodes",
126 * somebody has to call free_area_init() for UMA.
127 *
128 * In this mode, we only have one pg_data_t
129 * structure: contig_mem_data.
130 */
131void __init paging_init(void)
132{
133 unsigned long zones_sizes[MAX_NR_ZONES] = {0, };
134
135 /*
136 * This is not particularly well documented anywhere, but
137 * give ZONE_NORMAL all the memory, including the big holes
138 * left by the kernel+bootmem_map which are already left as reserved
139 * in the bootmem_map; free_area_init should see those bits and
140 * adjust accordingly.
141 */
142
143 zones_sizes[ZONE_NORMAL] = max_low_pfn;
144
145 free_area_init(zones_sizes); /* sets up the zonelists and mem_map */
146
147 /*
148 * Start of high memory area. Will probably need something more
149 * fancy if we... get more fancy.
150 */
151 high_memory = (void *)((bootmem_lastpg + 1) << PAGE_SHIFT);
152}
153
154#ifndef DMA_RESERVE
155#define DMA_RESERVE (4)
156#endif
157
158#define DMA_CHUNKSIZE (1<<22)
159#define DMA_RESERVED_BYTES (DMA_RESERVE * DMA_CHUNKSIZE)
160
161/*
162 * Pick out the memory size. We look for mem=size,
163 * where size is "size[KkMm]"
164 */
165static int __init early_mem(char *p)
166{
167 unsigned long size;
168 char *endp;
169
170 size = memparse(p, &endp);
171
172 bootmem_lastpg = PFN_DOWN(size);
173
174 return 0;
175}
176early_param("mem", early_mem);
177
178size_t hexagon_coherent_pool_size = (size_t) (DMA_RESERVE << 22);
179
180void __init setup_arch_memory(void)
181{
182 int bootmap_size;
183 /* XXX Todo: this probably should be cleaned up */
184 u32 *segtable = (u32 *) &swapper_pg_dir[0];
185 u32 *segtable_end;
186
187 /*
188 * Set up boot memory allocator
189 *
190 * The Gorman book also talks about these functions.
191 * This needs to change for highmem setups.
192 */
193
194 /* Prior to this, bootmem_lastpg is actually mem size */
195 bootmem_lastpg += ARCH_PFN_OFFSET;
196
197 /* Memory size needs to be a multiple of 16M */
198 bootmem_lastpg = PFN_DOWN((bootmem_lastpg << PAGE_SHIFT) &
199 ~((BIG_KERNEL_PAGE_SIZE) - 1));
200
201 /*
202 * Reserve the top DMA_RESERVE bytes of RAM for DMA (uncached)
203 * memory allocation
204 */
205
206 max_low_pfn = bootmem_lastpg - PFN_DOWN(DMA_RESERVED_BYTES);
207 min_low_pfn = ARCH_PFN_OFFSET;
208 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmem_startpg, min_low_pfn, max_low_pfn);
209
210 printk(KERN_INFO "bootmem_startpg: 0x%08lx\n", bootmem_startpg);
211 printk(KERN_INFO "bootmem_lastpg: 0x%08lx\n", bootmem_lastpg);
212 printk(KERN_INFO "bootmap_size: %d\n", bootmap_size);
213 printk(KERN_INFO "min_low_pfn: 0x%08lx\n", min_low_pfn);
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
228 /*
229 * Move forward to the start of empty pages; take into account
230 * phys_offset shift.
231 */
232
233 segtable += (bootmem_lastpg-ARCH_PFN_OFFSET)>>(22-PAGE_SHIFT);
234 {
235 int i;
236
237 for (i = 1 ; i <= DMA_RESERVE ; i++)
238 segtable[-i] = ((segtable[-i] & __HVM_PTE_PGMASK_4MB)
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
262 /*
263 * Free all the memory that wasn't taken up by the bootmap, the DMA
264 * reserve, or kernel itself.
265 */
266 free_bootmem(PFN_PHYS(bootmem_startpg) + bootmap_size,
267 PFN_PHYS(bootmem_lastpg - bootmem_startpg) - bootmap_size -
268 DMA_RESERVED_BYTES);
269
270 /*
271 * The bootmem allocator seemingly just lives to feed memory
272 * to the paging system
273 */
274 printk(KERN_INFO "PAGE_SIZE=%lu\n", PAGE_SIZE);
275 paging_init(); /* See Gorman Book, 2.3 */
276
277 /*
278 * At this point, the page allocator is kind of initialized, but
279 * apparently no pages are available (just like with the bootmem
280 * allocator), and need to be freed themselves via mem_init(),
281 * which is called by start_kernel() later on in the process
282 */
283}