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-rw-r--r--arch/m68knommu/mm/Makefile5
-rw-r--r--arch/m68knommu/mm/fault.c57
-rw-r--r--arch/m68knommu/mm/init.c231
-rw-r--r--arch/m68knommu/mm/kmap.c56
-rw-r--r--arch/m68knommu/mm/memory.c132
5 files changed, 481 insertions, 0 deletions
diff --git a/arch/m68knommu/mm/Makefile b/arch/m68knommu/mm/Makefile
new file mode 100644
index 000000000000..fc91f254f51b
--- /dev/null
+++ b/arch/m68knommu/mm/Makefile
@@ -0,0 +1,5 @@
1#
2# Makefile for the linux m68knommu specific parts of the memory manager.
3#
4
5obj-y += init.o fault.o memory.o kmap.o
diff --git a/arch/m68knommu/mm/fault.c b/arch/m68knommu/mm/fault.c
new file mode 100644
index 000000000000..6f6673cb5829
--- /dev/null
+++ b/arch/m68knommu/mm/fault.c
@@ -0,0 +1,57 @@
1/*
2 * linux/arch/m68knommu/mm/fault.c
3 *
4 * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
5 * Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
6 *
7 * Based on:
8 *
9 * linux/arch/m68k/mm/fault.c
10 *
11 * Copyright (C) 1995 Hamish Macdonald
12 */
13
14#include <linux/mman.h>
15#include <linux/mm.h>
16#include <linux/kernel.h>
17#include <linux/ptrace.h>
18
19#include <asm/system.h>
20#include <asm/pgtable.h>
21
22extern void die_if_kernel(char *, struct pt_regs *, long);
23
24/*
25 * This routine handles page faults. It determines the problem, and
26 * then passes it off to one of the appropriate routines.
27 *
28 * error_code:
29 * bit 0 == 0 means no page found, 1 means protection fault
30 * bit 1 == 0 means read, 1 means write
31 *
32 * If this routine detects a bad access, it returns 1, otherwise it
33 * returns 0.
34 */
35asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
36 unsigned long error_code)
37{
38#ifdef DEBUG
39 printk (KERN_DEBUG "regs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld\n",
40 regs->sr, regs->pc, address, error_code);
41#endif
42
43 /*
44 * Oops. The kernel tried to access some bad page. We'll have to
45 * terminate things with extreme prejudice.
46 */
47 if ((unsigned long) address < PAGE_SIZE) {
48 printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
49 } else
50 printk(KERN_ALERT "Unable to handle kernel access");
51 printk(KERN_ALERT " at virtual address %08lx\n",address);
52 die_if_kernel("Oops", regs, error_code);
53 do_exit(SIGKILL);
54
55 return 1;
56}
57
diff --git a/arch/m68knommu/mm/init.c b/arch/m68knommu/mm/init.c
new file mode 100644
index 000000000000..89f0b554ffb7
--- /dev/null
+++ b/arch/m68knommu/mm/init.c
@@ -0,0 +1,231 @@
1/*
2 * linux/arch/m68knommu/mm/init.c
3 *
4 * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
5 * Kenneth Albanowski <kjahds@kjahds.com>,
6 * Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
7 *
8 * Based on:
9 *
10 * linux/arch/m68k/mm/init.c
11 *
12 * Copyright (C) 1995 Hamish Macdonald
13 *
14 * JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com)
15 * DEC/2000 -- linux 2.4 support <davidm@snapgear.com>
16 */
17
18#include <linux/config.h>
19#include <linux/signal.h>
20#include <linux/sched.h>
21#include <linux/kernel.h>
22#include <linux/errno.h>
23#include <linux/string.h>
24#include <linux/types.h>
25#include <linux/ptrace.h>
26#include <linux/mman.h>
27#include <linux/mm.h>
28#include <linux/swap.h>
29#include <linux/init.h>
30#include <linux/highmem.h>
31#include <linux/pagemap.h>
32#include <linux/bootmem.h>
33#include <linux/slab.h>
34
35#include <asm/setup.h>
36#include <asm/segment.h>
37#include <asm/page.h>
38#include <asm/pgtable.h>
39#include <asm/system.h>
40#include <asm/machdep.h>
41
42#undef DEBUG
43
44extern void die_if_kernel(char *,struct pt_regs *,long);
45extern void free_initmem(void);
46
47/*
48 * BAD_PAGE is the page that is used for page faults when linux
49 * is out-of-memory. Older versions of linux just did a
50 * do_exit(), but using this instead means there is less risk
51 * for a process dying in kernel mode, possibly leaving a inode
52 * unused etc..
53 *
54 * BAD_PAGETABLE is the accompanying page-table: it is initialized
55 * to point to BAD_PAGE entries.
56 *
57 * ZERO_PAGE is a special page that is used for zero-initialized
58 * data and COW.
59 */
60static unsigned long empty_bad_page_table;
61
62static unsigned long empty_bad_page;
63
64unsigned long empty_zero_page;
65
66extern unsigned long rom_length;
67
68void show_mem(void)
69{
70 unsigned long i;
71 int free = 0, total = 0, reserved = 0, shared = 0;
72 int cached = 0;
73
74 printk(KERN_INFO "\nMem-info:\n");
75 show_free_areas();
76 i = max_mapnr;
77 while (i-- > 0) {
78 total++;
79 if (PageReserved(mem_map+i))
80 reserved++;
81 else if (PageSwapCache(mem_map+i))
82 cached++;
83 else if (!page_count(mem_map+i))
84 free++;
85 else
86 shared += page_count(mem_map+i) - 1;
87 }
88 printk(KERN_INFO "%d pages of RAM\n",total);
89 printk(KERN_INFO "%d free pages\n",free);
90 printk(KERN_INFO "%d reserved pages\n",reserved);
91 printk(KERN_INFO "%d pages shared\n",shared);
92 printk(KERN_INFO "%d pages swap cached\n",cached);
93}
94
95extern unsigned long memory_start;
96extern unsigned long memory_end;
97
98/*
99 * paging_init() continues the virtual memory environment setup which
100 * was begun by the code in arch/head.S.
101 * The parameters are pointers to where to stick the starting and ending
102 * addresses of available kernel virtual memory.
103 */
104void paging_init(void)
105{
106 /*
107 * Make sure start_mem is page aligned, otherwise bootmem and
108 * page_alloc get different views of the world.
109 */
110#ifdef DEBUG
111 unsigned long start_mem = PAGE_ALIGN(memory_start);
112#endif
113 unsigned long end_mem = memory_end & PAGE_MASK;
114
115#ifdef DEBUG
116 printk (KERN_DEBUG "start_mem is %#lx\nvirtual_end is %#lx\n",
117 start_mem, end_mem);
118#endif
119
120 /*
121 * Initialize the bad page table and bad page to point
122 * to a couple of allocated pages.
123 */
124 empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
125 empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
126 empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
127 memset((void *)empty_zero_page, 0, PAGE_SIZE);
128
129 /*
130 * Set up SFC/DFC registers (user data space).
131 */
132 set_fs (USER_DS);
133
134#ifdef DEBUG
135 printk (KERN_DEBUG "before free_area_init\n");
136
137 printk (KERN_DEBUG "free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
138 start_mem, end_mem);
139#endif
140
141 {
142 unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
143
144 zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
145 zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
146#ifdef CONFIG_HIGHMEM
147 zones_size[ZONE_HIGHMEM] = 0;
148#endif
149 free_area_init(zones_size);
150 }
151}
152
153void mem_init(void)
154{
155 int codek = 0, datak = 0, initk = 0;
156 unsigned long tmp;
157 extern char _etext, _stext, _sdata, _ebss, __init_begin, __init_end;
158 extern unsigned int _ramend, _rambase;
159 unsigned long len = _ramend - _rambase;
160 unsigned long start_mem = memory_start; /* DAVIDM - these must start at end of kernel */
161 unsigned long end_mem = memory_end; /* DAVIDM - this must not include kernel stack at top */
162
163#ifdef DEBUG
164 printk(KERN_DEBUG "Mem_init: start=%lx, end=%lx\n", start_mem, end_mem);
165#endif
166
167 end_mem &= PAGE_MASK;
168 high_memory = (void *) end_mem;
169
170 start_mem = PAGE_ALIGN(start_mem);
171 max_mapnr = num_physpages = (((unsigned long) high_memory) - PAGE_OFFSET) >> PAGE_SHIFT;
172
173 /* this will put all memory onto the freelists */
174 totalram_pages = free_all_bootmem();
175
176 codek = (&_etext - &_stext) >> 10;
177 datak = (&_ebss - &_sdata) >> 10;
178 initk = (&__init_begin - &__init_end) >> 10;
179
180 tmp = nr_free_pages() << PAGE_SHIFT;
181 printk(KERN_INFO "Memory available: %luk/%luk RAM, %luk/%luk ROM (%dk kernel code, %dk data)\n",
182 tmp >> 10,
183 len >> 10,
184 (rom_length > 0) ? ((rom_length >> 10) - codek) : 0,
185 rom_length >> 10,
186 codek,
187 datak
188 );
189}
190
191
192#ifdef CONFIG_BLK_DEV_INITRD
193void free_initrd_mem(unsigned long start, unsigned long end)
194{
195 int pages = 0;
196 for (; start < end; start += PAGE_SIZE) {
197 ClearPageReserved(virt_to_page(start));
198 set_page_count(virt_to_page(start), 1);
199 free_page(start);
200 totalram_pages++;
201 pages++;
202 }
203 printk (KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages);
204}
205#endif
206
207void
208free_initmem()
209{
210#ifdef CONFIG_RAMKERNEL
211 unsigned long addr;
212 extern char __init_begin, __init_end;
213 /*
214 * The following code should be cool even if these sections
215 * are not page aligned.
216 */
217 addr = PAGE_ALIGN((unsigned long)(&__init_begin));
218 /* next to check that the page we free is not a partial page */
219 for (; addr + PAGE_SIZE < (unsigned long)(&__init_end); addr +=PAGE_SIZE) {
220 ClearPageReserved(virt_to_page(addr));
221 set_page_count(virt_to_page(addr), 1);
222 free_page(addr);
223 totalram_pages++;
224 }
225 printk(KERN_NOTICE "Freeing unused kernel memory: %ldk freed (0x%x - 0x%x)\n",
226 (addr - PAGE_ALIGN((long) &__init_begin)) >> 10,
227 (int)(PAGE_ALIGN((unsigned long)(&__init_begin))),
228 (int)(addr - PAGE_SIZE));
229#endif
230}
231
diff --git a/arch/m68knommu/mm/kmap.c b/arch/m68knommu/mm/kmap.c
new file mode 100644
index 000000000000..04213e1c1e57
--- /dev/null
+++ b/arch/m68knommu/mm/kmap.c
@@ -0,0 +1,56 @@
1/*
2 * linux/arch/m68knommu/mm/kmap.c
3 *
4 * Copyright (C) 2000 Lineo, <davidm@snapgear.com>
5 * Copyright (C) 2000-2002 David McCullough <davidm@snapgear.com>
6 */
7
8#include <linux/config.h>
9#include <linux/mm.h>
10#include <linux/kernel.h>
11#include <linux/string.h>
12#include <linux/types.h>
13#include <linux/slab.h>
14#include <linux/vmalloc.h>
15
16#include <asm/setup.h>
17#include <asm/segment.h>
18#include <asm/page.h>
19#include <asm/pgalloc.h>
20#include <asm/io.h>
21#include <asm/system.h>
22
23#undef DEBUG
24
25/*
26 * Map some physical address range into the kernel address space.
27 */
28void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
29{
30 return (void *)physaddr;
31}
32
33/*
34 * Unmap a ioremap()ed region again.
35 */
36void iounmap(void *addr)
37{
38}
39
40/*
41 * __iounmap unmaps nearly everything, so be careful
42 * it doesn't free currently pointer/page tables anymore but it
43 * wans't used anyway and might be added later.
44 */
45void __iounmap(void *addr, unsigned long size)
46{
47}
48
49/*
50 * Set new cache mode for some kernel address space.
51 * The caller must push data for that range itself, if such data may already
52 * be in the cache.
53 */
54void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
55{
56}
diff --git a/arch/m68knommu/mm/memory.c b/arch/m68knommu/mm/memory.c
new file mode 100644
index 000000000000..0eef72915e61
--- /dev/null
+++ b/arch/m68knommu/mm/memory.c
@@ -0,0 +1,132 @@
1/*
2 * linux/arch/m68knommu/mm/memory.c
3 *
4 * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>,
5 * Copyright (C) 1999-2002, Greg Ungerer (gerg@snapgear.com)
6 *
7 * Based on:
8 *
9 * linux/arch/m68k/mm/memory.c
10 *
11 * Copyright (C) 1995 Hamish Macdonald
12 */
13
14#include <linux/config.h>
15#include <linux/mm.h>
16#include <linux/kernel.h>
17#include <linux/string.h>
18#include <linux/types.h>
19#include <linux/slab.h>
20
21#include <asm/setup.h>
22#include <asm/segment.h>
23#include <asm/page.h>
24#include <asm/pgtable.h>
25#include <asm/system.h>
26#include <asm/traps.h>
27#include <asm/io.h>
28
29/*
30 * cache_clear() semantics: Clear any cache entries for the area in question,
31 * without writing back dirty entries first. This is useful if the data will
32 * be overwritten anyway, e.g. by DMA to memory. The range is defined by a
33 * _physical_ address.
34 */
35
36void cache_clear (unsigned long paddr, int len)
37{
38}
39
40
41/*
42 * Define cache invalidate functions. The ColdFire 5407 is really
43 * the only processor that needs to do some work here. Anything
44 * that has separate data and instruction caches will be a problem.
45 */
46#ifdef CONFIG_M5407
47
48static __inline__ void cache_invalidate_lines(unsigned long paddr, int len)
49{
50 unsigned long sset, eset;
51
52 sset = (paddr & 0x00000ff0);
53 eset = ((paddr + len) & 0x0000ff0) + 0x10;
54
55 __asm__ __volatile__ (
56 "nop\n\t"
57 "clrl %%d0\n\t"
58 "1:\n\t"
59 "movel %0,%%a0\n\t"
60 "addl %%d0,%%a0\n\t"
61 "2:\n\t"
62 ".word 0xf4e8\n\t"
63 "addl #0x10,%%a0\n\t"
64 "cmpl %1,%%a0\n\t"
65 "blt 2b\n\t"
66 "addql #1,%%d0\n\t"
67 "cmpil #4,%%d0\n\t"
68 "bne 1b"
69 : : "a" (sset), "a" (eset) : "d0", "a0" );
70}
71
72#else
73#define cache_invalidate_lines(a,b)
74#endif
75
76
77/*
78 * cache_push() semantics: Write back any dirty cache data in the given area,
79 * and invalidate the range in the instruction cache. It needs not (but may)
80 * invalidate those entries also in the data cache. The range is defined by a
81 * _physical_ address.
82 */
83
84void cache_push (unsigned long paddr, int len)
85{
86 cache_invalidate_lines(paddr, len);
87}
88
89
90/*
91 * cache_push_v() semantics: Write back any dirty cache data in the given
92 * area, and invalidate those entries at least in the instruction cache. This
93 * is intended to be used after data has been written that can be executed as
94 * code later. The range is defined by a _user_mode_ _virtual_ address (or,
95 * more exactly, the space is defined by the %sfc/%dfc register.)
96 */
97
98void cache_push_v (unsigned long vaddr, int len)
99{
100 cache_invalidate_lines(vaddr, len);
101}
102
103/* Map some physical address range into the kernel address space. The
104 * code is copied and adapted from map_chunk().
105 */
106
107unsigned long kernel_map(unsigned long paddr, unsigned long size,
108 int nocacheflag, unsigned long *memavailp )
109{
110 return paddr;
111}
112
113
114int is_in_rom(unsigned long addr)
115{
116 extern unsigned long _ramstart, _ramend;
117
118 /*
119 * What we are really trying to do is determine if addr is
120 * in an allocated kernel memory region. If not then assume
121 * we cannot free it or otherwise de-allocate it. Ideally
122 * we could restrict this to really being in a ROM or flash,
123 * but that would need to be done on a board by board basis,
124 * not globally.
125 */
126 if ((addr < _ramstart) || (addr >= _ramend))
127 return(1);
128
129 /* Default case, not in ROM */
130 return(0);
131}
132
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-30 16:53:51 -0500