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authorMichal Simek <monstr@monstr.eu>2009-03-27 09:25:29 -0400
committerMichal Simek <monstr@monstr.eu>2009-03-27 09:25:29 -0400
commita95d0e1602f9f3ab54c7dbc9727bf22095705d1e (patch)
tree95e055b7dd904c98acf25d9915cc6bd61a83d2cd /arch/microblaze/mm
parent65bc60930c32b4831800056c8e0a0571c9b6a0bf (diff)
microblaze_v8: memory inicialization, MMU, TLB
Reviewed-by: Ingo Molnar <mingo@elte.hu> Acked-by: John Linn <john.linn@xilinx.com> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: John Williams <john.williams@petalogix.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/mm')
-rw-r--r--arch/microblaze/mm/init.c201
1 files changed, 201 insertions, 0 deletions
diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
new file mode 100644
index 000000000000..b0c8213cd6cf
--- /dev/null
+++ b/arch/microblaze/mm/init.c
@@ -0,0 +1,201 @@
1/*
2 * Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2006 Atmark Techno, Inc.
4 *
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
7 * for more details.
8 */
9
10#include <linux/bootmem.h>
11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/lmb.h>
14#include <linux/mm.h> /* mem_init */
15#include <linux/initrd.h>
16#include <linux/pagemap.h>
17#include <linux/pfn.h>
18#include <linux/swap.h>
19
20#include <asm/page.h>
21#include <asm/mmu_context.h>
22#include <asm/pgalloc.h>
23#include <asm/sections.h>
24#include <asm/tlb.h>
25
26unsigned int __page_offset;
27/* EXPORT_SYMBOL(__page_offset); */
28
29char *klimit = _end;
30
31/*
32 * Initialize the bootmem system and give it all the memory we
33 * have available.
34 */
35unsigned int memory_start;
36unsigned int memory_end; /* due to mm/nommu.c */
37unsigned int memory_size;
38
39/*
40 * paging_init() sets up the page tables - in fact we've already done this.
41 */
42static void __init paging_init(void)
43{
44 int i;
45 unsigned long zones_size[MAX_NR_ZONES];
46
47 /*
48 * old: we can DMA to/from any address.put all page into ZONE_DMA
49 * We use only ZONE_NORMAL
50 */
51 zones_size[ZONE_NORMAL] = max_mapnr;
52
53 /* every other zones are empty */
54 for (i = 1; i < MAX_NR_ZONES; i++)
55 zones_size[i] = 0;
56
57 free_area_init(zones_size);
58}
59
60void __init setup_memory(void)
61{
62 int i;
63 unsigned long map_size;
64 u32 kernel_align_start, kernel_align_size;
65
66 /* Find main memory where is the kernel */
67 for (i = 0; i < lmb.memory.cnt; i++) {
68 memory_start = (u32) lmb.memory.region[i].base;
69 memory_end = (u32) lmb.memory.region[i].base
70 + (u32) lmb.memory.region[i].size;
71 if ((memory_start <= (u32)_text) &&
72 ((u32)_text <= memory_end)) {
73 memory_size = memory_end - memory_start;
74 PAGE_OFFSET = memory_start;
75 printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, "
76 "size 0x%08x\n", __func__, memory_start,
77 memory_end, memory_size);
78 break;
79 }
80 }
81
82 if (!memory_start || !memory_end) {
83 panic("%s: Missing memory setting 0x%08x-0x%08x\n",
84 __func__, memory_start, memory_end);
85 }
86
87 /* reservation of region where is the kernel */
88 kernel_align_start = PAGE_DOWN((u32)_text);
89 /* ALIGN can be remove because _end in vmlinux.lds.S is align */
90 kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
91 lmb_reserve(kernel_align_start, kernel_align_size);
92 printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
93 __func__, kernel_align_start, kernel_align_start
94 + kernel_align_size, kernel_align_size);
95
96 /*
97 * Kernel:
98 * start: base phys address of kernel - page align
99 * end: base phys address of kernel - page align
100 *
101 * min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
102 * max_low_pfn
103 * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
104 * num_physpages - number of all pages
105 */
106
107 /* memory start is from the kernel end (aligned) to higher addr */
108 min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
109 /* RAM is assumed contiguous */
110 num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
111 max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT;
112
113 printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
114 printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
115 printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
116
117 /*
118 * Find an area to use for the bootmem bitmap.
119 * We look for the first area which is at least
120 * 128kB in length (128kB is enough for a bitmap
121 * for 4GB of memory, using 4kB pages), plus 1 page
122 * (in case the address isn't page-aligned).
123 */
124 map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)_end)),
125 min_low_pfn, max_low_pfn);
126
127 lmb_reserve(PFN_UP(TOPHYS((u32)_end)) << PAGE_SHIFT, map_size);
128
129 /* free bootmem is whole main memory */
130 free_bootmem(memory_start, memory_size);
131
132 /* reserve allocate blocks */
133 for (i = 0; i < lmb.reserved.cnt; i++) {
134 pr_debug("reserved %d - 0x%08x-0x%08x\n", i,
135 (u32) lmb.reserved.region[i].base,
136 (u32) lmb_size_bytes(&lmb.reserved, i));
137 reserve_bootmem(lmb.reserved.region[i].base,
138 lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT);
139 }
140 paging_init();
141}
142
143void free_init_pages(char *what, unsigned long begin, unsigned long end)
144{
145 unsigned long addr;
146
147 for (addr = begin; addr < end; addr += PAGE_SIZE) {
148 ClearPageReserved(virt_to_page(addr));
149 init_page_count(virt_to_page(addr));
150 memset((void *)addr, 0xcc, PAGE_SIZE);
151 free_page(addr);
152 totalram_pages++;
153 }
154 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
155}
156
157#ifdef CONFIG_BLK_DEV_INITRD
158void free_initrd_mem(unsigned long start, unsigned long end)
159{
160 int pages = 0;
161 for (; start < end; start += PAGE_SIZE) {
162 ClearPageReserved(virt_to_page(start));
163 init_page_count(virt_to_page(start));
164 free_page(start);
165 totalram_pages++;
166 pages++;
167 }
168 printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages);
169}
170#endif
171
172void free_initmem(void)
173{
174 free_init_pages("unused kernel memory",
175 (unsigned long)(&__init_begin),
176 (unsigned long)(&__init_end));
177}
178
179/* FIXME from arch/powerpc/mm/mem.c*/
180void show_mem(void)
181{
182 printk(KERN_NOTICE "%s\n", __func__);
183}
184
185void __init mem_init(void)
186{
187 high_memory = (void *)__va(memory_end);
188 /* this will put all memory onto the freelists */
189 totalram_pages += free_all_bootmem();
190
191 printk(KERN_INFO "Memory: %luk/%luk available\n",
192 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
193 num_physpages << (PAGE_SHIFT-10));
194}
195
196/* Check against bounds of physical memory */
197int ___range_ok(unsigned long addr, unsigned long size)
198{
199 return ((addr < memory_start) ||
200 ((addr + size) > memory_end));
201}