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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Uwe Zeisbergerf30c2262006-10-03 23:01:26 +02002 * linux/arch/m68k/mm/motorola.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Routines specific to the Motorola MMU, originally from:
5 * linux/arch/m68k/init.c
6 * which are Copyright (C) 1995 Hamish Macdonald
7 *
8 * Moved 8/20/1999 Sam Creasey
9 */
10
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/module.h>
12#include <linux/signal.h>
13#include <linux/sched.h>
14#include <linux/mm.h>
15#include <linux/swap.h>
16#include <linux/kernel.h>
17#include <linux/string.h>
18#include <linux/types.h>
19#include <linux/init.h>
20#include <linux/bootmem.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23#include <asm/setup.h>
24#include <asm/uaccess.h>
25#include <asm/page.h>
26#include <asm/pgalloc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <asm/machdep.h>
28#include <asm/io.h>
29#include <asm/dma.h>
30#ifdef CONFIG_ATARI
31#include <asm/atari_stram.h>
32#endif
Geert Uytterhoevenc85627f2008-12-21 12:03:37 +010033#include <asm/sections.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
35#undef DEBUG
36
37#ifndef mm_cachebits
38/*
39 * Bits to add to page descriptors for "normal" caching mode.
40 * For 68020/030 this is 0.
41 * For 68040, this is _PAGE_CACHE040 (cachable, copyback)
42 */
43unsigned long mm_cachebits;
44EXPORT_SYMBOL(mm_cachebits);
45#endif
46
Roman Zippel12d810c2007-05-31 00:40:54 -070047/* size of memory already mapped in head.S */
Andreas Schwab486df8b2014-04-24 12:24:48 +020048extern __initdata unsigned long m68k_init_mapped_size;
Roman Zippel12d810c2007-05-31 00:40:54 -070049
50extern unsigned long availmem;
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052static pte_t * __init kernel_page_table(void)
53{
54 pte_t *ptablep;
55
56 ptablep = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
57
58 clear_page(ptablep);
59 __flush_page_to_ram(ptablep);
60 flush_tlb_kernel_page(ptablep);
61 nocache_page(ptablep);
62
63 return ptablep;
64}
65
66static pmd_t *last_pgtable __initdata = NULL;
67pmd_t *zero_pgtable __initdata = NULL;
68
69static pmd_t * __init kernel_ptr_table(void)
70{
71 if (!last_pgtable) {
72 unsigned long pmd, last;
73 int i;
74
75 /* Find the last ptr table that was used in head.S and
76 * reuse the remaining space in that page for further
77 * ptr tables.
78 */
79 last = (unsigned long)kernel_pg_dir;
80 for (i = 0; i < PTRS_PER_PGD; i++) {
81 if (!pgd_present(kernel_pg_dir[i]))
82 continue;
83 pmd = __pgd_page(kernel_pg_dir[i]);
84 if (pmd > last)
85 last = pmd;
86 }
87
88 last_pgtable = (pmd_t *)last;
89#ifdef DEBUG
90 printk("kernel_ptr_init: %p\n", last_pgtable);
91#endif
92 }
93
94 last_pgtable += PTRS_PER_PMD;
95 if (((unsigned long)last_pgtable & ~PAGE_MASK) == 0) {
96 last_pgtable = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
97
98 clear_page(last_pgtable);
99 __flush_page_to_ram(last_pgtable);
100 flush_tlb_kernel_page(last_pgtable);
101 nocache_page(last_pgtable);
102 }
103
104 return last_pgtable;
105}
106
Roman Zippel12d810c2007-05-31 00:40:54 -0700107static void __init map_node(int node)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108{
109#define PTRTREESIZE (256*1024)
110#define ROOTTREESIZE (32*1024*1024)
Roman Zippel12d810c2007-05-31 00:40:54 -0700111 unsigned long physaddr, virtaddr, size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 pgd_t *pgd_dir;
113 pmd_t *pmd_dir;
114 pte_t *pte_dir;
115
Roman Zippel12d810c2007-05-31 00:40:54 -0700116 size = m68k_memory[node].size;
117 physaddr = m68k_memory[node].addr;
118 virtaddr = (unsigned long)phys_to_virt(physaddr);
119 physaddr |= m68k_supervisor_cachemode |
120 _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 if (CPU_IS_040_OR_060)
122 physaddr |= _PAGE_GLOBAL040;
123
124 while (size > 0) {
125#ifdef DEBUG
126 if (!(virtaddr & (PTRTREESIZE-1)))
127 printk ("\npa=%#lx va=%#lx ", physaddr & PAGE_MASK,
128 virtaddr);
129#endif
130 pgd_dir = pgd_offset_k(virtaddr);
131 if (virtaddr && CPU_IS_020_OR_030) {
132 if (!(virtaddr & (ROOTTREESIZE-1)) &&
133 size >= ROOTTREESIZE) {
134#ifdef DEBUG
135 printk ("[very early term]");
136#endif
137 pgd_val(*pgd_dir) = physaddr;
138 size -= ROOTTREESIZE;
139 virtaddr += ROOTTREESIZE;
140 physaddr += ROOTTREESIZE;
141 continue;
142 }
143 }
144 if (!pgd_present(*pgd_dir)) {
145 pmd_dir = kernel_ptr_table();
146#ifdef DEBUG
147 printk ("[new pointer %p]", pmd_dir);
148#endif
149 pgd_set(pgd_dir, pmd_dir);
150 } else
151 pmd_dir = pmd_offset(pgd_dir, virtaddr);
152
153 if (CPU_IS_020_OR_030) {
154 if (virtaddr) {
155#ifdef DEBUG
156 printk ("[early term]");
157#endif
158 pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr;
159 physaddr += PTRTREESIZE;
160 } else {
161 int i;
162#ifdef DEBUG
163 printk ("[zero map]");
164#endif
165 zero_pgtable = kernel_ptr_table();
166 pte_dir = (pte_t *)zero_pgtable;
167 pmd_dir->pmd[0] = virt_to_phys(pte_dir) |
168 _PAGE_TABLE | _PAGE_ACCESSED;
169 pte_val(*pte_dir++) = 0;
170 physaddr += PAGE_SIZE;
171 for (i = 1; i < 64; physaddr += PAGE_SIZE, i++)
172 pte_val(*pte_dir++) = physaddr;
173 }
174 size -= PTRTREESIZE;
175 virtaddr += PTRTREESIZE;
176 } else {
177 if (!pmd_present(*pmd_dir)) {
178#ifdef DEBUG
179 printk ("[new table]");
180#endif
181 pte_dir = kernel_page_table();
182 pmd_set(pmd_dir, pte_dir);
183 }
184 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
185
186 if (virtaddr) {
187 if (!pte_present(*pte_dir))
188 pte_val(*pte_dir) = physaddr;
189 } else
190 pte_val(*pte_dir) = 0;
191 size -= PAGE_SIZE;
192 virtaddr += PAGE_SIZE;
193 physaddr += PAGE_SIZE;
194 }
195
196 }
197#ifdef DEBUG
198 printk("\n");
199#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200}
201
202/*
203 * paging_init() continues the virtual memory environment setup which
204 * was begun by the code in arch/head.S.
205 */
206void __init paging_init(void)
207{
Roman Zippel2dcf15b2006-06-23 02:04:58 -0700208 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
Roman Zippel12d810c2007-05-31 00:40:54 -0700209 unsigned long min_addr, max_addr;
210 unsigned long addr, size, end;
211 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
213#ifdef DEBUG
Geert Uytterhoevenfb425d02007-08-22 14:01:30 -0700214 printk ("start of paging_init (%p, %lx)\n", kernel_pg_dir, availmem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215#endif
216
217 /* Fix the cache mode in the page descriptors for the 680[46]0. */
218 if (CPU_IS_040_OR_060) {
219 int i;
220#ifndef mm_cachebits
221 mm_cachebits = _PAGE_CACHE040;
222#endif
223 for (i = 0; i < 16; i++)
224 pgprot_val(protection_map[i]) |= _PAGE_CACHE040;
225 }
226
Roman Zippel12d810c2007-05-31 00:40:54 -0700227 min_addr = m68k_memory[0].addr;
228 max_addr = min_addr + m68k_memory[0].size;
229 for (i = 1; i < m68k_num_memory;) {
230 if (m68k_memory[i].addr < min_addr) {
231 printk("Ignoring memory chunk at 0x%lx:0x%lx before the first chunk\n",
232 m68k_memory[i].addr, m68k_memory[i].size);
233 printk("Fix your bootloader or use a memfile to make use of this area!\n");
234 m68k_num_memory--;
235 memmove(m68k_memory + i, m68k_memory + i + 1,
Geert Uytterhoeven79930082013-10-02 21:50:56 +0200236 (m68k_num_memory - i) * sizeof(struct m68k_mem_info));
Roman Zippel12d810c2007-05-31 00:40:54 -0700237 continue;
238 }
239 addr = m68k_memory[i].addr + m68k_memory[i].size;
240 if (addr > max_addr)
241 max_addr = addr;
242 i++;
243 }
244 m68k_memoffset = min_addr - PAGE_OFFSET;
245 m68k_virt_to_node_shift = fls(max_addr - min_addr - 1) - 6;
246
Roman Zippelfbe9c962007-05-31 00:40:50 -0700247 module_fixup(NULL, __start_fixup, __stop_fixup);
248 flush_icache();
249
Roman Zippel12d810c2007-05-31 00:40:54 -0700250 high_memory = phys_to_virt(max_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Roman Zippel12d810c2007-05-31 00:40:54 -0700252 min_low_pfn = availmem >> PAGE_SHIFT;
253 max_low_pfn = max_addr >> PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
Roman Zippel12d810c2007-05-31 00:40:54 -0700255 for (i = 0; i < m68k_num_memory; i++) {
256 addr = m68k_memory[i].addr;
257 end = addr + m68k_memory[i].size;
258 m68k_setup_node(i);
259 availmem = PAGE_ALIGN(availmem);
260 availmem += init_bootmem_node(NODE_DATA(i),
261 availmem >> PAGE_SHIFT,
262 addr >> PAGE_SHIFT,
263 end >> PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 }
265
Roman Zippel12d810c2007-05-31 00:40:54 -0700266 /*
267 * Map the physical memory available into the kernel virtual
268 * address space. First initialize the bootmem allocator with
269 * the memory we already mapped, so map_node() has something
270 * to allocate.
271 */
272 addr = m68k_memory[0].addr;
273 size = m68k_memory[0].size;
Andreas Schwab486df8b2014-04-24 12:24:48 +0200274 free_bootmem_node(NODE_DATA(0), availmem,
275 min(m68k_init_mapped_size, size) - (availmem - addr));
Roman Zippel12d810c2007-05-31 00:40:54 -0700276 map_node(0);
Andreas Schwab486df8b2014-04-24 12:24:48 +0200277 if (size > m68k_init_mapped_size)
278 free_bootmem_node(NODE_DATA(0), addr + m68k_init_mapped_size,
279 size - m68k_init_mapped_size);
Roman Zippel12d810c2007-05-31 00:40:54 -0700280
281 for (i = 1; i < m68k_num_memory; i++)
282 map_node(i);
283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 flush_tlb_all();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
286 /*
287 * initialize the bad page table and bad page to point
288 * to a couple of allocated pages
289 */
290 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292 /*
293 * Set up SFC/DFC registers
294 */
295 set_fs(KERNEL_DS);
296
297#ifdef DEBUG
298 printk ("before free_area_init\n");
299#endif
Roman Zippel12d810c2007-05-31 00:40:54 -0700300 for (i = 0; i < m68k_num_memory; i++) {
301 zones_size[ZONE_DMA] = m68k_memory[i].size >> PAGE_SHIFT;
Johannes Weiner9109fb72008-07-23 21:27:20 -0700302 free_area_init_node(i, zones_size,
Roman Zippel12d810c2007-05-31 00:40:54 -0700303 m68k_memory[i].addr >> PAGE_SHIFT, NULL);
Michael Schmitz4aac0b482011-04-26 14:51:53 +1200304 if (node_present_pages(i))
305 node_set_state(i, N_NORMAL_MEMORY);
Roman Zippel12d810c2007-05-31 00:40:54 -0700306 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307}
308