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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/m68k/mm
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/m68k/mm')
-rw-r--r--arch/m68k/mm/Makefile8
-rw-r--r--arch/m68k/mm/fault.c219
-rw-r--r--arch/m68k/mm/hwtest.c85
-rw-r--r--arch/m68k/mm/init.c147
-rw-r--r--arch/m68k/mm/kmap.c361
-rw-r--r--arch/m68k/mm/memory.c471
-rw-r--r--arch/m68k/mm/motorola.c285
-rw-r--r--arch/m68k/mm/sun3kmap.c156
-rw-r--r--arch/m68k/mm/sun3mmu.c102
9 files changed, 1834 insertions, 0 deletions
diff --git a/arch/m68k/mm/Makefile b/arch/m68k/mm/Makefile
new file mode 100644
index 000000000000..90f1c735c110
--- /dev/null
+++ b/arch/m68k/mm/Makefile
@@ -0,0 +1,8 @@
1#
2# Makefile for the linux m68k-specific parts of the memory manager.
3#
4
5obj-y := init.o fault.o hwtest.o
6
7obj-$(CONFIG_MMU_MOTOROLA) += kmap.o memory.o motorola.o
8obj-$(CONFIG_MMU_SUN3) += sun3kmap.o sun3mmu.o
diff --git a/arch/m68k/mm/fault.c b/arch/m68k/mm/fault.c
new file mode 100644
index 000000000000..ac48b6d2aff6
--- /dev/null
+++ b/arch/m68k/mm/fault.c
@@ -0,0 +1,219 @@
1/*
2 * linux/arch/m68k/mm/fault.c
3 *
4 * Copyright (C) 1995 Hamish Macdonald
5 */
6
7#include <linux/mman.h>
8#include <linux/mm.h>
9#include <linux/kernel.h>
10#include <linux/ptrace.h>
11#include <linux/interrupt.h>
12#include <linux/module.h>
13
14#include <asm/setup.h>
15#include <asm/traps.h>
16#include <asm/system.h>
17#include <asm/uaccess.h>
18#include <asm/pgalloc.h>
19
20extern void die_if_kernel(char *, struct pt_regs *, long);
21extern const int frame_extra_sizes[]; /* in m68k/kernel/signal.c */
22
23int send_fault_sig(struct pt_regs *regs)
24{
25 siginfo_t siginfo = { 0, 0, 0, };
26
27 siginfo.si_signo = current->thread.signo;
28 siginfo.si_code = current->thread.code;
29 siginfo.si_addr = (void *)current->thread.faddr;
30#ifdef DEBUG
31 printk("send_fault_sig: %p,%d,%d\n", siginfo.si_addr, siginfo.si_signo, siginfo.si_code);
32#endif
33
34 if (user_mode(regs)) {
35 force_sig_info(siginfo.si_signo,
36 &siginfo, current);
37 } else {
38 const struct exception_table_entry *fixup;
39
40 /* Are we prepared to handle this kernel fault? */
41 if ((fixup = search_exception_tables(regs->pc))) {
42 struct pt_regs *tregs;
43 /* Create a new four word stack frame, discarding the old
44 one. */
45 regs->stkadj = frame_extra_sizes[regs->format];
46 tregs = (struct pt_regs *)((ulong)regs + regs->stkadj);
47 tregs->vector = regs->vector;
48 tregs->format = 0;
49 tregs->pc = fixup->fixup;
50 tregs->sr = regs->sr;
51 return -1;
52 }
53
54 //if (siginfo.si_signo == SIGBUS)
55 // force_sig_info(siginfo.si_signo,
56 // &siginfo, current);
57
58 /*
59 * Oops. The kernel tried to access some bad page. We'll have to
60 * terminate things with extreme prejudice.
61 */
62 if ((unsigned long)siginfo.si_addr < PAGE_SIZE)
63 printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
64 else
65 printk(KERN_ALERT "Unable to handle kernel access");
66 printk(" at virtual address %p\n", siginfo.si_addr);
67 die_if_kernel("Oops", regs, 0 /*error_code*/);
68 do_exit(SIGKILL);
69 }
70
71 return 1;
72}
73
74/*
75 * This routine handles page faults. It determines the problem, and
76 * then passes it off to one of the appropriate routines.
77 *
78 * error_code:
79 * bit 0 == 0 means no page found, 1 means protection fault
80 * bit 1 == 0 means read, 1 means write
81 *
82 * If this routine detects a bad access, it returns 1, otherwise it
83 * returns 0.
84 */
85int do_page_fault(struct pt_regs *regs, unsigned long address,
86 unsigned long error_code)
87{
88 struct mm_struct *mm = current->mm;
89 struct vm_area_struct * vma;
90 int write, fault;
91
92#ifdef DEBUG
93 printk ("do page fault:\nregs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld, %p\n",
94 regs->sr, regs->pc, address, error_code,
95 current->mm->pgd);
96#endif
97
98 /*
99 * If we're in an interrupt or have no user
100 * context, we must not take the fault..
101 */
102 if (in_interrupt() || !mm)
103 goto no_context;
104
105 down_read(&mm->mmap_sem);
106
107 vma = find_vma(mm, address);
108 if (!vma)
109 goto map_err;
110 if (vma->vm_flags & VM_IO)
111 goto acc_err;
112 if (vma->vm_start <= address)
113 goto good_area;
114 if (!(vma->vm_flags & VM_GROWSDOWN))
115 goto map_err;
116 if (user_mode(regs)) {
117 /* Accessing the stack below usp is always a bug. The
118 "+ 256" is there due to some instructions doing
119 pre-decrement on the stack and that doesn't show up
120 until later. */
121 if (address + 256 < rdusp())
122 goto map_err;
123 }
124 if (expand_stack(vma, address))
125 goto map_err;
126
127/*
128 * Ok, we have a good vm_area for this memory access, so
129 * we can handle it..
130 */
131good_area:
132#ifdef DEBUG
133 printk("do_page_fault: good_area\n");
134#endif
135 write = 0;
136 switch (error_code & 3) {
137 default: /* 3: write, present */
138 /* fall through */
139 case 2: /* write, not present */
140 if (!(vma->vm_flags & VM_WRITE))
141 goto acc_err;
142 write++;
143 break;
144 case 1: /* read, present */
145 goto acc_err;
146 case 0: /* read, not present */
147 if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
148 goto acc_err;
149 }
150
151 /*
152 * If for any reason at all we couldn't handle the fault,
153 * make sure we exit gracefully rather than endlessly redo
154 * the fault.
155 */
156
157 survive:
158 fault = handle_mm_fault(mm, vma, address, write);
159#ifdef DEBUG
160 printk("handle_mm_fault returns %d\n",fault);
161#endif
162 switch (fault) {
163 case 1:
164 current->min_flt++;
165 break;
166 case 2:
167 current->maj_flt++;
168 break;
169 case 0:
170 goto bus_err;
171 default:
172 goto out_of_memory;
173 }
174
175 up_read(&mm->mmap_sem);
176 return 0;
177
178/*
179 * We ran out of memory, or some other thing happened to us that made
180 * us unable to handle the page fault gracefully.
181 */
182out_of_memory:
183 up_read(&mm->mmap_sem);
184 if (current->pid == 1) {
185 yield();
186 down_read(&mm->mmap_sem);
187 goto survive;
188 }
189
190 printk("VM: killing process %s\n", current->comm);
191 if (user_mode(regs))
192 do_exit(SIGKILL);
193
194no_context:
195 current->thread.signo = SIGBUS;
196 current->thread.faddr = address;
197 return send_fault_sig(regs);
198
199bus_err:
200 current->thread.signo = SIGBUS;
201 current->thread.code = BUS_ADRERR;
202 current->thread.faddr = address;
203 goto send_sig;
204
205map_err:
206 current->thread.signo = SIGSEGV;
207 current->thread.code = SEGV_MAPERR;
208 current->thread.faddr = address;
209 goto send_sig;
210
211acc_err:
212 current->thread.signo = SIGSEGV;
213 current->thread.code = SEGV_ACCERR;
214 current->thread.faddr = address;
215
216send_sig:
217 up_read(&mm->mmap_sem);
218 return send_fault_sig(regs);
219}
diff --git a/arch/m68k/mm/hwtest.c b/arch/m68k/mm/hwtest.c
new file mode 100644
index 000000000000..2c7dde3c6430
--- /dev/null
+++ b/arch/m68k/mm/hwtest.c
@@ -0,0 +1,85 @@
1/* Tests for presence or absence of hardware registers.
2 * This code was originally in atari/config.c, but I noticed
3 * that it was also in drivers/nubus/nubus.c and I wanted to
4 * use it in hp300/config.c, so it seemed sensible to pull it
5 * out into its own file.
6 *
7 * The test is for use when trying to read a hardware register
8 * that isn't present would cause a bus error. We set up a
9 * temporary handler so that this doesn't kill the kernel.
10 *
11 * There is a test-by-reading and a test-by-writing; I present
12 * them here complete with the comments from the original atari
13 * config.c...
14 * -- PMM <pmaydell@chiark.greenend.org.uk>, 05/1998
15 */
16
17/* This function tests for the presence of an address, specially a
18 * hardware register address. It is called very early in the kernel
19 * initialization process, when the VBR register isn't set up yet. On
20 * an Atari, it still points to address 0, which is unmapped. So a bus
21 * error would cause another bus error while fetching the exception
22 * vector, and the CPU would do nothing at all. So we needed to set up
23 * a temporary VBR and a vector table for the duration of the test.
24 */
25
26#include <linux/module.h>
27
28int hwreg_present( volatile void *regp )
29{
30 int ret = 0;
31 long save_sp, save_vbr;
32 long tmp_vectors[3];
33
34 __asm__ __volatile__
35 ( "movec %/vbr,%2\n\t"
36 "movel #Lberr1,%4@(8)\n\t"
37 "movec %4,%/vbr\n\t"
38 "movel %/sp,%1\n\t"
39 "moveq #0,%0\n\t"
40 "tstb %3@\n\t"
41 "nop\n\t"
42 "moveq #1,%0\n"
43 "Lberr1:\n\t"
44 "movel %1,%/sp\n\t"
45 "movec %2,%/vbr"
46 : "=&d" (ret), "=&r" (save_sp), "=&r" (save_vbr)
47 : "a" (regp), "a" (tmp_vectors)
48 );
49
50 return( ret );
51}
52EXPORT_SYMBOL(hwreg_present);
53
54/* Basically the same, but writes a value into a word register, protected
55 * by a bus error handler. Returns 1 if successful, 0 otherwise.
56 */
57
58int hwreg_write( volatile void *regp, unsigned short val )
59{
60 int ret;
61 long save_sp, save_vbr;
62 long tmp_vectors[3];
63
64 __asm__ __volatile__
65 ( "movec %/vbr,%2\n\t"
66 "movel #Lberr2,%4@(8)\n\t"
67 "movec %4,%/vbr\n\t"
68 "movel %/sp,%1\n\t"
69 "moveq #0,%0\n\t"
70 "movew %5,%3@\n\t"
71 "nop \n\t" /* If this nop isn't present, 'ret' may already be
72 * loaded with 1 at the time the bus error
73 * happens! */
74 "moveq #1,%0\n"
75 "Lberr2:\n\t"
76 "movel %1,%/sp\n\t"
77 "movec %2,%/vbr"
78 : "=&d" (ret), "=&r" (save_sp), "=&r" (save_vbr)
79 : "a" (regp), "a" (tmp_vectors), "g" (val)
80 );
81
82 return( ret );
83}
84EXPORT_SYMBOL(hwreg_write);
85
diff --git a/arch/m68k/mm/init.c b/arch/m68k/mm/init.c
new file mode 100644
index 000000000000..c45beb955943
--- /dev/null
+++ b/arch/m68k/mm/init.c
@@ -0,0 +1,147 @@
1/*
2 * linux/arch/m68k/mm/init.c
3 *
4 * Copyright (C) 1995 Hamish Macdonald
5 *
6 * Contains common initialization routines, specific init code moved
7 * to motorola.c and sun3mmu.c
8 */
9
10#include <linux/config.h>
11#include <linux/signal.h>
12#include <linux/sched.h>
13#include <linux/mm.h>
14#include <linux/swap.h>
15#include <linux/kernel.h>
16#include <linux/string.h>
17#include <linux/types.h>
18#include <linux/init.h>
19#include <linux/bootmem.h>
20
21#include <asm/setup.h>
22#include <asm/uaccess.h>
23#include <asm/page.h>
24#include <asm/pgalloc.h>
25#include <asm/system.h>
26#include <asm/machdep.h>
27#include <asm/io.h>
28#ifdef CONFIG_ATARI
29#include <asm/atari_stram.h>
30#endif
31#include <asm/tlb.h>
32
33DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
34
35/*
36 * ZERO_PAGE is a special page that is used for zero-initialized
37 * data and COW.
38 */
39
40void *empty_zero_page;
41
42void show_mem(void)
43{
44 unsigned long i;
45 int free = 0, total = 0, reserved = 0, shared = 0;
46 int cached = 0;
47
48 printk("\nMem-info:\n");
49 show_free_areas();
50 printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
51 i = max_mapnr;
52 while (i-- > 0) {
53 total++;
54 if (PageReserved(mem_map+i))
55 reserved++;
56 else if (PageSwapCache(mem_map+i))
57 cached++;
58 else if (!page_count(mem_map+i))
59 free++;
60 else
61 shared += page_count(mem_map+i) - 1;
62 }
63 printk("%d pages of RAM\n",total);
64 printk("%d free pages\n",free);
65 printk("%d reserved pages\n",reserved);
66 printk("%d pages shared\n",shared);
67 printk("%d pages swap cached\n",cached);
68}
69
70extern void init_pointer_table(unsigned long ptable);
71
72/* References to section boundaries */
73
74extern char _text, _etext, _edata, __bss_start, _end;
75extern char __init_begin, __init_end;
76
77extern pmd_t *zero_pgtable;
78
79void __init mem_init(void)
80{
81 int codepages = 0;
82 int datapages = 0;
83 int initpages = 0;
84 unsigned long tmp;
85#ifndef CONFIG_SUN3
86 int i;
87#endif
88
89 max_mapnr = num_physpages = (((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT);
90
91#ifdef CONFIG_ATARI
92 if (MACH_IS_ATARI)
93 atari_stram_mem_init_hook();
94#endif
95
96 /* this will put all memory onto the freelists */
97 totalram_pages = free_all_bootmem();
98
99 for (tmp = PAGE_OFFSET ; tmp < (unsigned long)high_memory; tmp += PAGE_SIZE) {
100 if (PageReserved(virt_to_page(tmp))) {
101 if (tmp >= (unsigned long)&_text
102 && tmp < (unsigned long)&_etext)
103 codepages++;
104 else if (tmp >= (unsigned long) &__init_begin
105 && tmp < (unsigned long) &__init_end)
106 initpages++;
107 else
108 datapages++;
109 continue;
110 }
111 }
112
113#ifndef CONFIG_SUN3
114 /* insert pointer tables allocated so far into the tablelist */
115 init_pointer_table((unsigned long)kernel_pg_dir);
116 for (i = 0; i < PTRS_PER_PGD; i++) {
117 if (pgd_present(kernel_pg_dir[i]))
118 init_pointer_table(__pgd_page(kernel_pg_dir[i]));
119 }
120
121 /* insert also pointer table that we used to unmap the zero page */
122 if (zero_pgtable)
123 init_pointer_table((unsigned long)zero_pgtable);
124#endif
125
126 printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
127 (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
128 max_mapnr << (PAGE_SHIFT-10),
129 codepages << (PAGE_SHIFT-10),
130 datapages << (PAGE_SHIFT-10),
131 initpages << (PAGE_SHIFT-10));
132}
133
134#ifdef CONFIG_BLK_DEV_INITRD
135void free_initrd_mem(unsigned long start, unsigned long end)
136{
137 int pages = 0;
138 for (; start < end; start += PAGE_SIZE) {
139 ClearPageReserved(virt_to_page(start));
140 set_page_count(virt_to_page(start), 1);
141 free_page(start);
142 totalram_pages++;
143 pages++;
144 }
145 printk ("Freeing initrd memory: %dk freed\n", pages);
146}
147#endif
diff --git a/arch/m68k/mm/kmap.c b/arch/m68k/mm/kmap.c
new file mode 100644
index 000000000000..5dcb3fa35ea9
--- /dev/null
+++ b/arch/m68k/mm/kmap.c
@@ -0,0 +1,361 @@
1/*
2 * linux/arch/m68k/mm/kmap.c
3 *
4 * Copyright (C) 1997 Roman Hodek
5 *
6 * 10/01/99 cleaned up the code and changing to the same interface
7 * used by other architectures /Roman Zippel
8 */
9
10#include <linux/config.h>
11#include <linux/mm.h>
12#include <linux/kernel.h>
13#include <linux/string.h>
14#include <linux/types.h>
15#include <linux/slab.h>
16#include <linux/vmalloc.h>
17
18#include <asm/setup.h>
19#include <asm/segment.h>
20#include <asm/page.h>
21#include <asm/pgalloc.h>
22#include <asm/io.h>
23#include <asm/system.h>
24
25#undef DEBUG
26
27#define PTRTREESIZE (256*1024)
28
29/*
30 * For 040/060 we can use the virtual memory area like other architectures,
31 * but for 020/030 we want to use early termination page descriptor and we
32 * can't mix this with normal page descriptors, so we have to copy that code
33 * (mm/vmalloc.c) and return appriorate aligned addresses.
34 */
35
36#ifdef CPU_M68040_OR_M68060_ONLY
37
38#define IO_SIZE PAGE_SIZE
39
40static inline struct vm_struct *get_io_area(unsigned long size)
41{
42 return get_vm_area(size, VM_IOREMAP);
43}
44
45
46static inline void free_io_area(void *addr)
47{
48 vfree((void *)(PAGE_MASK & (unsigned long)addr));
49}
50
51#else
52
53#define IO_SIZE (256*1024)
54
55static struct vm_struct *iolist;
56
57static struct vm_struct *get_io_area(unsigned long size)
58{
59 unsigned long addr;
60 struct vm_struct **p, *tmp, *area;
61
62 area = (struct vm_struct *)kmalloc(sizeof(*area), GFP_KERNEL);
63 if (!area)
64 return NULL;
65 addr = KMAP_START;
66 for (p = &iolist; (tmp = *p) ; p = &tmp->next) {
67 if (size + addr < (unsigned long)tmp->addr)
68 break;
69 if (addr > KMAP_END-size)
70 return NULL;
71 addr = tmp->size + (unsigned long)tmp->addr;
72 }
73 area->addr = (void *)addr;
74 area->size = size + IO_SIZE;
75 area->next = *p;
76 *p = area;
77 return area;
78}
79
80static inline void free_io_area(void *addr)
81{
82 struct vm_struct **p, *tmp;
83
84 if (!addr)
85 return;
86 addr = (void *)((unsigned long)addr & -IO_SIZE);
87 for (p = &iolist ; (tmp = *p) ; p = &tmp->next) {
88 if (tmp->addr == addr) {
89 *p = tmp->next;
90 __iounmap(tmp->addr, tmp->size);
91 kfree(tmp);
92 return;
93 }
94 }
95}
96
97#endif
98
99/*
100 * Map some physical address range into the kernel address space. The
101 * code is copied and adapted from map_chunk().
102 */
103/* Rewritten by Andreas Schwab to remove all races. */
104
105void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
106{
107 struct vm_struct *area;
108 unsigned long virtaddr, retaddr;
109 long offset;
110 pgd_t *pgd_dir;
111 pmd_t *pmd_dir;
112 pte_t *pte_dir;
113
114 /*
115 * Don't allow mappings that wrap..
116 */
117 if (!size || size > physaddr + size)
118 return NULL;
119
120#ifdef CONFIG_AMIGA
121 if (MACH_IS_AMIGA) {
122 if ((physaddr >= 0x40000000) && (physaddr + size < 0x60000000)
123 && (cacheflag == IOMAP_NOCACHE_SER))
124 return (void *)physaddr;
125 }
126#endif
127
128#ifdef DEBUG
129 printk("ioremap: 0x%lx,0x%lx(%d) - ", physaddr, size, cacheflag);
130#endif
131 /*
132 * Mappings have to be aligned
133 */
134 offset = physaddr & (IO_SIZE - 1);
135 physaddr &= -IO_SIZE;
136 size = (size + offset + IO_SIZE - 1) & -IO_SIZE;
137
138 /*
139 * Ok, go for it..
140 */
141 area = get_io_area(size);
142 if (!area)
143 return NULL;
144
145 virtaddr = (unsigned long)area->addr;
146 retaddr = virtaddr + offset;
147#ifdef DEBUG
148 printk("0x%lx,0x%lx,0x%lx", physaddr, virtaddr, retaddr);
149#endif
150
151 /*
152 * add cache and table flags to physical address
153 */
154 if (CPU_IS_040_OR_060) {
155 physaddr |= (_PAGE_PRESENT | _PAGE_GLOBAL040 |
156 _PAGE_ACCESSED | _PAGE_DIRTY);
157 switch (cacheflag) {
158 case IOMAP_FULL_CACHING:
159 physaddr |= _PAGE_CACHE040;
160 break;
161 case IOMAP_NOCACHE_SER:
162 default:
163 physaddr |= _PAGE_NOCACHE_S;
164 break;
165 case IOMAP_NOCACHE_NONSER:
166 physaddr |= _PAGE_NOCACHE;
167 break;
168 case IOMAP_WRITETHROUGH:
169 physaddr |= _PAGE_CACHE040W;
170 break;
171 }
172 } else {
173 physaddr |= (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
174 switch (cacheflag) {
175 case IOMAP_NOCACHE_SER:
176 case IOMAP_NOCACHE_NONSER:
177 default:
178 physaddr |= _PAGE_NOCACHE030;
179 break;
180 case IOMAP_FULL_CACHING:
181 case IOMAP_WRITETHROUGH:
182 break;
183 }
184 }
185
186 while ((long)size > 0) {
187#ifdef DEBUG
188 if (!(virtaddr & (PTRTREESIZE-1)))
189 printk ("\npa=%#lx va=%#lx ", physaddr, virtaddr);
190#endif
191 pgd_dir = pgd_offset_k(virtaddr);
192 pmd_dir = pmd_alloc(&init_mm, pgd_dir, virtaddr);
193 if (!pmd_dir) {
194 printk("ioremap: no mem for pmd_dir\n");
195 return NULL;
196 }
197
198 if (CPU_IS_020_OR_030) {
199 pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr;
200 physaddr += PTRTREESIZE;
201 virtaddr += PTRTREESIZE;
202 size -= PTRTREESIZE;
203 } else {
204 pte_dir = pte_alloc_kernel(&init_mm, pmd_dir, virtaddr);
205 if (!pte_dir) {
206 printk("ioremap: no mem for pte_dir\n");
207 return NULL;
208 }
209
210 pte_val(*pte_dir) = physaddr;
211 virtaddr += PAGE_SIZE;
212 physaddr += PAGE_SIZE;
213 size -= PAGE_SIZE;
214 }
215 }
216#ifdef DEBUG
217 printk("\n");
218#endif
219 flush_tlb_all();
220
221 return (void *)retaddr;
222}
223
224/*
225 * Unmap a ioremap()ed region again
226 */
227void iounmap(void *addr)
228{
229#ifdef CONFIG_AMIGA
230 if ((!MACH_IS_AMIGA) ||
231 (((unsigned long)addr < 0x40000000) ||
232 ((unsigned long)addr > 0x60000000)))
233 free_io_area(addr);
234#else
235 free_io_area(addr);
236#endif
237}
238
239/*
240 * __iounmap unmaps nearly everything, so be careful
241 * it doesn't free currently pointer/page tables anymore but it
242 * wans't used anyway and might be added later.
243 */
244void __iounmap(void *addr, unsigned long size)
245{
246 unsigned long virtaddr = (unsigned long)addr;
247 pgd_t *pgd_dir;
248 pmd_t *pmd_dir;
249 pte_t *pte_dir;
250
251 while ((long)size > 0) {
252 pgd_dir = pgd_offset_k(virtaddr);
253 if (pgd_bad(*pgd_dir)) {
254 printk("iounmap: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
255 pgd_clear(pgd_dir);
256 return;
257 }
258 pmd_dir = pmd_offset(pgd_dir, virtaddr);
259
260 if (CPU_IS_020_OR_030) {
261 int pmd_off = (virtaddr/PTRTREESIZE) & 15;
262
263 if ((pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK) == _PAGE_PRESENT) {
264 pmd_dir->pmd[pmd_off] = 0;
265 virtaddr += PTRTREESIZE;
266 size -= PTRTREESIZE;
267 continue;
268 }
269 }
270
271 if (pmd_bad(*pmd_dir)) {
272 printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
273 pmd_clear(pmd_dir);
274 return;
275 }
276 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
277
278 pte_val(*pte_dir) = 0;
279 virtaddr += PAGE_SIZE;
280 size -= PAGE_SIZE;
281 }
282
283 flush_tlb_all();
284}
285
286/*
287 * Set new cache mode for some kernel address space.
288 * The caller must push data for that range itself, if such data may already
289 * be in the cache.
290 */
291void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
292{
293 unsigned long virtaddr = (unsigned long)addr;
294 pgd_t *pgd_dir;
295 pmd_t *pmd_dir;
296 pte_t *pte_dir;
297
298 if (CPU_IS_040_OR_060) {
299 switch (cmode) {
300 case IOMAP_FULL_CACHING:
301 cmode = _PAGE_CACHE040;
302 break;
303 case IOMAP_NOCACHE_SER:
304 default:
305 cmode = _PAGE_NOCACHE_S;
306 break;
307 case IOMAP_NOCACHE_NONSER:
308 cmode = _PAGE_NOCACHE;
309 break;
310 case IOMAP_WRITETHROUGH:
311 cmode = _PAGE_CACHE040W;
312 break;
313 }
314 } else {
315 switch (cmode) {
316 case IOMAP_NOCACHE_SER:
317 case IOMAP_NOCACHE_NONSER:
318 default:
319 cmode = _PAGE_NOCACHE030;
320 break;
321 case IOMAP_FULL_CACHING:
322 case IOMAP_WRITETHROUGH:
323 cmode = 0;
324 }
325 }
326
327 while ((long)size > 0) {
328 pgd_dir = pgd_offset_k(virtaddr);
329 if (pgd_bad(*pgd_dir)) {
330 printk("iocachemode: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
331 pgd_clear(pgd_dir);
332 return;
333 }
334 pmd_dir = pmd_offset(pgd_dir, virtaddr);
335
336 if (CPU_IS_020_OR_030) {
337 int pmd_off = (virtaddr/PTRTREESIZE) & 15;
338
339 if ((pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK) == _PAGE_PRESENT) {
340 pmd_dir->pmd[pmd_off] = (pmd_dir->pmd[pmd_off] &
341 _CACHEMASK040) | cmode;
342 virtaddr += PTRTREESIZE;
343 size -= PTRTREESIZE;
344 continue;
345 }
346 }
347
348 if (pmd_bad(*pmd_dir)) {
349 printk("iocachemode: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
350 pmd_clear(pmd_dir);
351 return;
352 }
353 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
354
355 pte_val(*pte_dir) = (pte_val(*pte_dir) & _CACHEMASK040) | cmode;
356 virtaddr += PAGE_SIZE;
357 size -= PAGE_SIZE;
358 }
359
360 flush_tlb_all();
361}
diff --git a/arch/m68k/mm/memory.c b/arch/m68k/mm/memory.c
new file mode 100644
index 000000000000..1453a6013721
--- /dev/null
+++ b/arch/m68k/mm/memory.c
@@ -0,0 +1,471 @@
1/*
2 * linux/arch/m68k/mm/memory.c
3 *
4 * Copyright (C) 1995 Hamish Macdonald
5 */
6
7#include <linux/config.h>
8#include <linux/mm.h>
9#include <linux/kernel.h>
10#include <linux/string.h>
11#include <linux/types.h>
12#include <linux/slab.h>
13#include <linux/init.h>
14#include <linux/pagemap.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/system.h>
21#include <asm/traps.h>
22#include <asm/machdep.h>
23
24
25/* ++andreas: {get,free}_pointer_table rewritten to use unused fields from
26 struct page instead of separately kmalloced struct. Stolen from
27 arch/sparc/mm/srmmu.c ... */
28
29typedef struct list_head ptable_desc;
30static LIST_HEAD(ptable_list);
31
32#define PD_PTABLE(page) ((ptable_desc *)&(virt_to_page(page)->lru))
33#define PD_PAGE(ptable) (list_entry(ptable, struct page, lru))
34#define PD_MARKBITS(dp) (*(unsigned char *)&PD_PAGE(dp)->index)
35
36#define PTABLE_SIZE (PTRS_PER_PMD * sizeof(pmd_t))
37
38void __init init_pointer_table(unsigned long ptable)
39{
40 ptable_desc *dp;
41 unsigned long page = ptable & PAGE_MASK;
42 unsigned char mask = 1 << ((ptable - page)/PTABLE_SIZE);
43
44 dp = PD_PTABLE(page);
45 if (!(PD_MARKBITS(dp) & mask)) {
46 PD_MARKBITS(dp) = 0xff;
47 list_add(dp, &ptable_list);
48 }
49
50 PD_MARKBITS(dp) &= ~mask;
51#ifdef DEBUG
52 printk("init_pointer_table: %lx, %x\n", ptable, PD_MARKBITS(dp));
53#endif
54
55 /* unreserve the page so it's possible to free that page */
56 PD_PAGE(dp)->flags &= ~(1 << PG_reserved);
57 set_page_count(PD_PAGE(dp), 1);
58
59 return;
60}
61
62pmd_t *get_pointer_table (void)
63{
64 ptable_desc *dp = ptable_list.next;
65 unsigned char mask = PD_MARKBITS (dp);
66 unsigned char tmp;
67 unsigned int off;
68
69 /*
70 * For a pointer table for a user process address space, a
71 * table is taken from a page allocated for the purpose. Each
72 * page can hold 8 pointer tables. The page is remapped in
73 * virtual address space to be noncacheable.
74 */
75 if (mask == 0) {
76 void *page;
77 ptable_desc *new;
78
79 if (!(page = (void *)get_zeroed_page(GFP_KERNEL)))
80 return NULL;
81
82 flush_tlb_kernel_page(page);
83 nocache_page(page);
84
85 new = PD_PTABLE(page);
86 PD_MARKBITS(new) = 0xfe;
87 list_add_tail(new, dp);
88
89 return (pmd_t *)page;
90 }
91
92 for (tmp = 1, off = 0; (mask & tmp) == 0; tmp <<= 1, off += PTABLE_SIZE)
93 ;
94 PD_MARKBITS(dp) = mask & ~tmp;
95 if (!PD_MARKBITS(dp)) {
96 /* move to end of list */
97 list_del(dp);
98 list_add_tail(dp, &ptable_list);
99 }
100 return (pmd_t *) (page_address(PD_PAGE(dp)) + off);
101}
102
103int free_pointer_table (pmd_t *ptable)
104{
105 ptable_desc *dp;
106 unsigned long page = (unsigned long)ptable & PAGE_MASK;
107 unsigned char mask = 1 << (((unsigned long)ptable - page)/PTABLE_SIZE);
108
109 dp = PD_PTABLE(page);
110 if (PD_MARKBITS (dp) & mask)
111 panic ("table already free!");
112
113 PD_MARKBITS (dp) |= mask;
114
115 if (PD_MARKBITS(dp) == 0xff) {
116 /* all tables in page are free, free page */
117 list_del(dp);
118 cache_page((void *)page);
119 free_page (page);
120 return 1;
121 } else if (ptable_list.next != dp) {
122 /*
123 * move this descriptor to the front of the list, since
124 * it has one or more free tables.
125 */
126 list_del(dp);
127 list_add(dp, &ptable_list);
128 }
129 return 0;
130}
131
132#ifdef DEBUG_INVALID_PTOV
133int mm_inv_cnt = 5;
134#endif
135
136#ifndef CONFIG_SINGLE_MEMORY_CHUNK
137/*
138 * The following two routines map from a physical address to a kernel
139 * virtual address and vice versa.
140 */
141unsigned long mm_vtop(unsigned long vaddr)
142{
143 int i=0;
144 unsigned long voff = (unsigned long)vaddr - PAGE_OFFSET;
145
146 do {
147 if (voff < m68k_memory[i].size) {
148#ifdef DEBUGPV
149 printk ("VTOP(%p)=%lx\n", vaddr,
150 m68k_memory[i].addr + voff);
151#endif
152 return m68k_memory[i].addr + voff;
153 }
154 voff -= m68k_memory[i].size;
155 } while (++i < m68k_num_memory);
156
157 /* As a special case allow `__pa(high_memory)'. */
158 if (voff == 0)
159 return m68k_memory[i-1].addr + m68k_memory[i-1].size;
160
161 return -1;
162}
163#endif
164
165#ifndef CONFIG_SINGLE_MEMORY_CHUNK
166unsigned long mm_ptov (unsigned long paddr)
167{
168 int i = 0;
169 unsigned long poff, voff = PAGE_OFFSET;
170
171 do {
172 poff = paddr - m68k_memory[i].addr;
173 if (poff < m68k_memory[i].size) {
174#ifdef DEBUGPV
175 printk ("PTOV(%lx)=%lx\n", paddr, poff + voff);
176#endif
177 return poff + voff;
178 }
179 voff += m68k_memory[i].size;
180 } while (++i < m68k_num_memory);
181
182#ifdef DEBUG_INVALID_PTOV
183 if (mm_inv_cnt > 0) {
184 mm_inv_cnt--;
185 printk("Invalid use of phys_to_virt(0x%lx) at 0x%p!\n",
186 paddr, __builtin_return_address(0));
187 }
188#endif
189 return -1;
190}
191#endif
192
193/* invalidate page in both caches */
194static inline void clear040(unsigned long paddr)
195{
196 asm volatile (
197 "nop\n\t"
198 ".chip 68040\n\t"
199 "cinvp %%bc,(%0)\n\t"
200 ".chip 68k"
201 : : "a" (paddr));
202}
203
204/* invalidate page in i-cache */
205static inline void cleari040(unsigned long paddr)
206{
207 asm volatile (
208 "nop\n\t"
209 ".chip 68040\n\t"
210 "cinvp %%ic,(%0)\n\t"
211 ".chip 68k"
212 : : "a" (paddr));
213}
214
215/* push page in both caches */
216/* RZ: cpush %bc DOES invalidate %ic, regardless of DPI */
217static inline void push040(unsigned long paddr)
218{
219 asm volatile (
220 "nop\n\t"
221 ".chip 68040\n\t"
222 "cpushp %%bc,(%0)\n\t"
223 ".chip 68k"
224 : : "a" (paddr));
225}
226
227/* push and invalidate page in both caches, must disable ints
228 * to avoid invalidating valid data */
229static inline void pushcl040(unsigned long paddr)
230{
231 unsigned long flags;
232
233 local_irq_save(flags);
234 push040(paddr);
235 if (CPU_IS_060)
236 clear040(paddr);
237 local_irq_restore(flags);
238}
239
240/*
241 * 040: Hit every page containing an address in the range paddr..paddr+len-1.
242 * (Low order bits of the ea of a CINVP/CPUSHP are "don't care"s).
243 * Hit every page until there is a page or less to go. Hit the next page,
244 * and the one after that if the range hits it.
245 */
246/* ++roman: A little bit more care is required here: The CINVP instruction
247 * invalidates cache entries WITHOUT WRITING DIRTY DATA BACK! So the beginning
248 * and the end of the region must be treated differently if they are not
249 * exactly at the beginning or end of a page boundary. Else, maybe too much
250 * data becomes invalidated and thus lost forever. CPUSHP does what we need:
251 * it invalidates the page after pushing dirty data to memory. (Thanks to Jes
252 * for discovering the problem!)
253 */
254/* ... but on the '060, CPUSH doesn't invalidate (for us, since we have set
255 * the DPI bit in the CACR; would it cause problems with temporarily changing
256 * this?). So we have to push first and then additionally to invalidate.
257 */
258
259
260/*
261 * cache_clear() semantics: Clear any cache entries for the area in question,
262 * without writing back dirty entries first. This is useful if the data will
263 * be overwritten anyway, e.g. by DMA to memory. The range is defined by a
264 * _physical_ address.
265 */
266
267void cache_clear (unsigned long paddr, int len)
268{
269 if (CPU_IS_040_OR_060) {
270 int tmp;
271
272 /*
273 * We need special treatment for the first page, in case it
274 * is not page-aligned. Page align the addresses to work
275 * around bug I17 in the 68060.
276 */
277 if ((tmp = -paddr & (PAGE_SIZE - 1))) {
278 pushcl040(paddr & PAGE_MASK);
279 if ((len -= tmp) <= 0)
280 return;
281 paddr += tmp;
282 }
283 tmp = PAGE_SIZE;
284 paddr &= PAGE_MASK;
285 while ((len -= tmp) >= 0) {
286 clear040(paddr);
287 paddr += tmp;
288 }
289 if ((len += tmp))
290 /* a page boundary gets crossed at the end */
291 pushcl040(paddr);
292 }
293 else /* 68030 or 68020 */
294 asm volatile ("movec %/cacr,%/d0\n\t"
295 "oriw %0,%/d0\n\t"
296 "movec %/d0,%/cacr"
297 : : "i" (FLUSH_I_AND_D)
298 : "d0");
299#ifdef CONFIG_M68K_L2_CACHE
300 if(mach_l2_flush)
301 mach_l2_flush(0);
302#endif
303}
304
305
306/*
307 * cache_push() semantics: Write back any dirty cache data in the given area,
308 * and invalidate the range in the instruction cache. It needs not (but may)
309 * invalidate those entries also in the data cache. The range is defined by a
310 * _physical_ address.
311 */
312
313void cache_push (unsigned long paddr, int len)
314{
315 if (CPU_IS_040_OR_060) {
316 int tmp = PAGE_SIZE;
317
318 /*
319 * on 68040 or 68060, push cache lines for pages in the range;
320 * on the '040 this also invalidates the pushed lines, but not on
321 * the '060!
322 */
323 len += paddr & (PAGE_SIZE - 1);
324
325 /*
326 * Work around bug I17 in the 68060 affecting some instruction
327 * lines not being invalidated properly.
328 */
329 paddr &= PAGE_MASK;
330
331 do {
332 push040(paddr);
333 paddr += tmp;
334 } while ((len -= tmp) > 0);
335 }
336 /*
337 * 68030/68020 have no writeback cache. On the other hand,
338 * cache_push is actually a superset of cache_clear (the lines
339 * get written back and invalidated), so we should make sure
340 * to perform the corresponding actions. After all, this is getting
341 * called in places where we've just loaded code, or whatever, so
342 * flushing the icache is appropriate; flushing the dcache shouldn't
343 * be required.
344 */
345 else /* 68030 or 68020 */
346 asm volatile ("movec %/cacr,%/d0\n\t"
347 "oriw %0,%/d0\n\t"
348 "movec %/d0,%/cacr"
349 : : "i" (FLUSH_I)
350 : "d0");
351#ifdef CONFIG_M68K_L2_CACHE
352 if(mach_l2_flush)
353 mach_l2_flush(1);
354#endif
355}
356
357static unsigned long virt_to_phys_slow(unsigned long vaddr)
358{
359 if (CPU_IS_060) {
360 mm_segment_t fs = get_fs();
361 unsigned long paddr;
362
363 set_fs(get_ds());
364
365 /* The PLPAR instruction causes an access error if the translation
366 * is not possible. To catch this we use the same exception mechanism
367 * as for user space accesses in <asm/uaccess.h>. */
368 asm volatile (".chip 68060\n"
369 "1: plpar (%0)\n"
370 ".chip 68k\n"
371 "2:\n"
372 ".section .fixup,\"ax\"\n"
373 " .even\n"
374 "3: sub.l %0,%0\n"
375 " jra 2b\n"
376 ".previous\n"
377 ".section __ex_table,\"a\"\n"
378 " .align 4\n"
379 " .long 1b,3b\n"
380 ".previous"
381 : "=a" (paddr)
382 : "0" (vaddr));
383 set_fs(fs);
384 return paddr;
385 } else if (CPU_IS_040) {
386 mm_segment_t fs = get_fs();
387 unsigned long mmusr;
388
389 set_fs(get_ds());
390
391 asm volatile (".chip 68040\n\t"
392 "ptestr (%1)\n\t"
393 "movec %%mmusr, %0\n\t"
394 ".chip 68k"
395 : "=r" (mmusr)
396 : "a" (vaddr));
397 set_fs(fs);
398
399 if (mmusr & MMU_R_040)
400 return (mmusr & PAGE_MASK) | (vaddr & ~PAGE_MASK);
401 } else {
402 unsigned short mmusr;
403 unsigned long *descaddr;
404
405 asm volatile ("ptestr #5,%2@,#7,%0\n\t"
406 "pmove %%psr,%1@"
407 : "=a&" (descaddr)
408 : "a" (&mmusr), "a" (vaddr));
409 if (mmusr & (MMU_I|MMU_B|MMU_L))
410 return 0;
411 descaddr = phys_to_virt((unsigned long)descaddr);
412 switch (mmusr & MMU_NUM) {
413 case 1:
414 return (*descaddr & 0xfe000000) | (vaddr & 0x01ffffff);
415 case 2:
416 return (*descaddr & 0xfffc0000) | (vaddr & 0x0003ffff);
417 case 3:
418 return (*descaddr & PAGE_MASK) | (vaddr & ~PAGE_MASK);
419 }
420 }
421 return 0;
422}
423
424/* Push n pages at kernel virtual address and clear the icache */
425/* RZ: use cpush %bc instead of cpush %dc, cinv %ic */
426void flush_icache_range(unsigned long address, unsigned long endaddr)
427{
428 if (CPU_IS_040_OR_060) {
429 address &= PAGE_MASK;
430
431 if (address >= PAGE_OFFSET && address < (unsigned long)high_memory) {
432 do {
433 asm volatile ("nop\n\t"
434 ".chip 68040\n\t"
435 "cpushp %%bc,(%0)\n\t"
436 ".chip 68k"
437 : : "a" (virt_to_phys((void *)address)));
438 address += PAGE_SIZE;
439 } while (address < endaddr);
440 } else {
441 do {
442 asm volatile ("nop\n\t"
443 ".chip 68040\n\t"
444 "cpushp %%bc,(%0)\n\t"
445 ".chip 68k"
446 : : "a" (virt_to_phys_slow(address)));
447 address += PAGE_SIZE;
448 } while (address < endaddr);
449 }
450 } else {
451 unsigned long tmp;
452 asm volatile ("movec %%cacr,%0\n\t"
453 "orw %1,%0\n\t"
454 "movec %0,%%cacr"
455 : "=&d" (tmp)
456 : "di" (FLUSH_I));
457 }
458}
459
460
461#ifndef CONFIG_SINGLE_MEMORY_CHUNK
462int mm_end_of_chunk (unsigned long addr, int len)
463{
464 int i;
465
466 for (i = 0; i < m68k_num_memory; i++)
467 if (m68k_memory[i].addr + m68k_memory[i].size == addr + len)
468 return 1;
469 return 0;
470}
471#endif
diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c
new file mode 100644
index 000000000000..d855fec26317
--- /dev/null
+++ b/arch/m68k/mm/motorola.c
@@ -0,0 +1,285 @@
1/*
2 * linux/arch/m68k/motorola.c
3 *
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
11#include <linux/config.h>
12#include <linux/module.h>
13#include <linux/signal.h>
14#include <linux/sched.h>
15#include <linux/mm.h>
16#include <linux/swap.h>
17#include <linux/kernel.h>
18#include <linux/string.h>
19#include <linux/types.h>
20#include <linux/init.h>
21#include <linux/bootmem.h>
22
23#include <asm/setup.h>
24#include <asm/uaccess.h>
25#include <asm/page.h>
26#include <asm/pgalloc.h>
27#include <asm/system.h>
28#include <asm/machdep.h>
29#include <asm/io.h>
30#include <asm/dma.h>
31#ifdef CONFIG_ATARI
32#include <asm/atari_stram.h>
33#endif
34
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
47static pte_t * __init kernel_page_table(void)
48{
49 pte_t *ptablep;
50
51 ptablep = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
52
53 clear_page(ptablep);
54 __flush_page_to_ram(ptablep);
55 flush_tlb_kernel_page(ptablep);
56 nocache_page(ptablep);
57
58 return ptablep;
59}
60
61static pmd_t *last_pgtable __initdata = NULL;
62pmd_t *zero_pgtable __initdata = NULL;
63
64static pmd_t * __init kernel_ptr_table(void)
65{
66 if (!last_pgtable) {
67 unsigned long pmd, last;
68 int i;
69
70 /* Find the last ptr table that was used in head.S and
71 * reuse the remaining space in that page for further
72 * ptr tables.
73 */
74 last = (unsigned long)kernel_pg_dir;
75 for (i = 0; i < PTRS_PER_PGD; i++) {
76 if (!pgd_present(kernel_pg_dir[i]))
77 continue;
78 pmd = __pgd_page(kernel_pg_dir[i]);
79 if (pmd > last)
80 last = pmd;
81 }
82
83 last_pgtable = (pmd_t *)last;
84#ifdef DEBUG
85 printk("kernel_ptr_init: %p\n", last_pgtable);
86#endif
87 }
88
89 last_pgtable += PTRS_PER_PMD;
90 if (((unsigned long)last_pgtable & ~PAGE_MASK) == 0) {
91 last_pgtable = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
92
93 clear_page(last_pgtable);
94 __flush_page_to_ram(last_pgtable);
95 flush_tlb_kernel_page(last_pgtable);
96 nocache_page(last_pgtable);
97 }
98
99 return last_pgtable;
100}
101
102static unsigned long __init
103map_chunk (unsigned long addr, long size)
104{
105#define PTRTREESIZE (256*1024)
106#define ROOTTREESIZE (32*1024*1024)
107 static unsigned long virtaddr = PAGE_OFFSET;
108 unsigned long physaddr;
109 pgd_t *pgd_dir;
110 pmd_t *pmd_dir;
111 pte_t *pte_dir;
112
113 physaddr = (addr | m68k_supervisor_cachemode |
114 _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
115 if (CPU_IS_040_OR_060)
116 physaddr |= _PAGE_GLOBAL040;
117
118 while (size > 0) {
119#ifdef DEBUG
120 if (!(virtaddr & (PTRTREESIZE-1)))
121 printk ("\npa=%#lx va=%#lx ", physaddr & PAGE_MASK,
122 virtaddr);
123#endif
124 pgd_dir = pgd_offset_k(virtaddr);
125 if (virtaddr && CPU_IS_020_OR_030) {
126 if (!(virtaddr & (ROOTTREESIZE-1)) &&
127 size >= ROOTTREESIZE) {
128#ifdef DEBUG
129 printk ("[very early term]");
130#endif
131 pgd_val(*pgd_dir) = physaddr;
132 size -= ROOTTREESIZE;
133 virtaddr += ROOTTREESIZE;
134 physaddr += ROOTTREESIZE;
135 continue;
136 }
137 }
138 if (!pgd_present(*pgd_dir)) {
139 pmd_dir = kernel_ptr_table();
140#ifdef DEBUG
141 printk ("[new pointer %p]", pmd_dir);
142#endif
143 pgd_set(pgd_dir, pmd_dir);
144 } else
145 pmd_dir = pmd_offset(pgd_dir, virtaddr);
146
147 if (CPU_IS_020_OR_030) {
148 if (virtaddr) {
149#ifdef DEBUG
150 printk ("[early term]");
151#endif
152 pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr;
153 physaddr += PTRTREESIZE;
154 } else {
155 int i;
156#ifdef DEBUG
157 printk ("[zero map]");
158#endif
159 zero_pgtable = kernel_ptr_table();
160 pte_dir = (pte_t *)zero_pgtable;
161 pmd_dir->pmd[0] = virt_to_phys(pte_dir) |
162 _PAGE_TABLE | _PAGE_ACCESSED;
163 pte_val(*pte_dir++) = 0;
164 physaddr += PAGE_SIZE;
165 for (i = 1; i < 64; physaddr += PAGE_SIZE, i++)
166 pte_val(*pte_dir++) = physaddr;
167 }
168 size -= PTRTREESIZE;
169 virtaddr += PTRTREESIZE;
170 } else {
171 if (!pmd_present(*pmd_dir)) {
172#ifdef DEBUG
173 printk ("[new table]");
174#endif
175 pte_dir = kernel_page_table();
176 pmd_set(pmd_dir, pte_dir);
177 }
178 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
179
180 if (virtaddr) {
181 if (!pte_present(*pte_dir))
182 pte_val(*pte_dir) = physaddr;
183 } else
184 pte_val(*pte_dir) = 0;
185 size -= PAGE_SIZE;
186 virtaddr += PAGE_SIZE;
187 physaddr += PAGE_SIZE;
188 }
189
190 }
191#ifdef DEBUG
192 printk("\n");
193#endif
194
195 return virtaddr;
196}
197
198/*
199 * paging_init() continues the virtual memory environment setup which
200 * was begun by the code in arch/head.S.
201 */
202void __init paging_init(void)
203{
204 int chunk;
205 unsigned long mem_avail = 0;
206 unsigned long zones_size[3] = { 0, };
207
208#ifdef DEBUG
209 {
210 extern unsigned long availmem;
211 printk ("start of paging_init (%p, %lx, %lx, %lx)\n",
212 kernel_pg_dir, availmem, start_mem, end_mem);
213 }
214#endif
215
216 /* Fix the cache mode in the page descriptors for the 680[46]0. */
217 if (CPU_IS_040_OR_060) {
218 int i;
219#ifndef mm_cachebits
220 mm_cachebits = _PAGE_CACHE040;
221#endif
222 for (i = 0; i < 16; i++)
223 pgprot_val(protection_map[i]) |= _PAGE_CACHE040;
224 }
225
226 /*
227 * Map the physical memory available into the kernel virtual
228 * address space. It may allocate some memory for page
229 * tables and thus modify availmem.
230 */
231
232 for (chunk = 0; chunk < m68k_num_memory; chunk++) {
233 mem_avail = map_chunk (m68k_memory[chunk].addr,
234 m68k_memory[chunk].size);
235
236 }
237
238 flush_tlb_all();
239#ifdef DEBUG
240 printk ("memory available is %ldKB\n", mem_avail >> 10);
241 printk ("start_mem is %#lx\nvirtual_end is %#lx\n",
242 start_mem, end_mem);
243#endif
244
245 /*
246 * initialize the bad page table and bad page to point
247 * to a couple of allocated pages
248 */
249 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
250 memset(empty_zero_page, 0, PAGE_SIZE);
251
252 /*
253 * Set up SFC/DFC registers
254 */
255 set_fs(KERNEL_DS);
256
257#ifdef DEBUG
258 printk ("before free_area_init\n");
259#endif
260 zones_size[0] = (mach_max_dma_address < (unsigned long)high_memory ?
261 (mach_max_dma_address+1) : (unsigned long)high_memory);
262 zones_size[1] = (unsigned long)high_memory - zones_size[0];
263
264 zones_size[0] = (zones_size[0] - PAGE_OFFSET) >> PAGE_SHIFT;
265 zones_size[1] >>= PAGE_SHIFT;
266
267 free_area_init(zones_size);
268}
269
270extern char __init_begin, __init_end;
271
272void free_initmem(void)
273{
274 unsigned long addr;
275
276 addr = (unsigned long)&__init_begin;
277 for (; addr < (unsigned long)&__init_end; addr += PAGE_SIZE) {
278 virt_to_page(addr)->flags &= ~(1 << PG_reserved);
279 set_page_count(virt_to_page(addr), 1);
280 free_page(addr);
281 totalram_pages++;
282 }
283}
284
285
diff --git a/arch/m68k/mm/sun3kmap.c b/arch/m68k/mm/sun3kmap.c
new file mode 100644
index 000000000000..7f0d86f3fe73
--- /dev/null
+++ b/arch/m68k/mm/sun3kmap.c
@@ -0,0 +1,156 @@
1/*
2 * linux/arch/m68k/mm/sun3kmap.c
3 *
4 * Copyright (C) 2002 Sam Creasey <sammy@sammy.net>
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive
8 * for more details.
9 */
10
11#include <linux/types.h>
12#include <linux/kernel.h>
13#include <linux/mm.h>
14#include <linux/vmalloc.h>
15
16#include <asm/page.h>
17#include <asm/pgtable.h>
18#include <asm/io.h>
19#include <asm/sun3mmu.h>
20
21#undef SUN3_KMAP_DEBUG
22
23#ifdef SUN3_KMAP_DEBUG
24extern void print_pte_vaddr(unsigned long vaddr);
25#endif
26
27extern void mmu_emu_map_pmeg (int context, int vaddr);
28
29static inline void do_page_mapin(unsigned long phys, unsigned long virt,
30 unsigned long type)
31{
32 unsigned long pte;
33 pte_t ptep;
34
35 ptep = pfn_pte(phys >> PAGE_SHIFT, PAGE_KERNEL);
36 pte = pte_val(ptep);
37 pte |= type;
38
39 sun3_put_pte(virt, pte);
40
41#ifdef SUN3_KMAP_DEBUG
42 print_pte_vaddr(virt);
43#endif
44
45}
46
47static inline void do_pmeg_mapin(unsigned long phys, unsigned long virt,
48 unsigned long type, int pages)
49{
50
51 if(sun3_get_segmap(virt & ~SUN3_PMEG_MASK) == SUN3_INVALID_PMEG)
52 mmu_emu_map_pmeg(sun3_get_context(), virt);
53
54 while(pages) {
55 do_page_mapin(phys, virt, type);
56 phys += PAGE_SIZE;
57 virt += PAGE_SIZE;
58 pages--;
59 }
60}
61
62void *sun3_ioremap(unsigned long phys, unsigned long size,
63 unsigned long type)
64{
65 struct vm_struct *area;
66 unsigned long offset, virt, ret;
67 int pages;
68
69 if(!size)
70 return NULL;
71
72 /* page align */
73 offset = phys & (PAGE_SIZE-1);
74 phys &= ~(PAGE_SIZE-1);
75
76 size += offset;
77 size = PAGE_ALIGN(size);
78 if((area = get_vm_area(size, VM_IOREMAP)) == NULL)
79 return NULL;
80
81#ifdef SUN3_KMAP_DEBUG
82 printk("ioremap: got virt %p size %lx(%lx)\n",
83 area->addr, size, area->size);
84#endif
85
86 pages = size / PAGE_SIZE;
87 virt = (unsigned long)area->addr;
88 ret = virt + offset;
89
90 while(pages) {
91 int seg_pages;
92
93 seg_pages = (SUN3_PMEG_SIZE - (virt & SUN3_PMEG_MASK)) / PAGE_SIZE;
94 if(seg_pages > pages)
95 seg_pages = pages;
96
97 do_pmeg_mapin(phys, virt, type, seg_pages);
98
99 pages -= seg_pages;
100 phys += seg_pages * PAGE_SIZE;
101 virt += seg_pages * PAGE_SIZE;
102 }
103
104 return (void *)ret;
105
106}
107
108
109void *__ioremap(unsigned long phys, unsigned long size, int cache)
110{
111
112 return sun3_ioremap(phys, size, SUN3_PAGE_TYPE_IO);
113
114}
115
116void iounmap(void *addr)
117{
118 vfree((void *)(PAGE_MASK & (unsigned long)addr));
119}
120
121/* sun3_map_test(addr, val) -- Reads a byte from addr, storing to val,
122 * trapping the potential read fault. Returns 0 if the access faulted,
123 * 1 on success.
124 *
125 * This function is primarily used to check addresses on the VME bus.
126 *
127 * Mucking with the page fault handler seems a little hackish to me, but
128 * SunOS, NetBSD, and Mach all implemented this check in such a manner,
129 * so I figure we're allowed.
130 */
131int sun3_map_test(unsigned long addr, char *val)
132{
133 int ret = 0;
134
135 __asm__ __volatile__
136 (".globl _sun3_map_test_start\n"
137 "_sun3_map_test_start:\n"
138 "1: moveb (%2), (%0)\n"
139 " moveq #1, %1\n"
140 "2:\n"
141 ".section .fixup,\"ax\"\n"
142 ".even\n"
143 "3: moveq #0, %1\n"
144 " jmp 2b\n"
145 ".previous\n"
146 ".section __ex_table,\"a\"\n"
147 ".align 4\n"
148 ".long 1b,3b\n"
149 ".previous\n"
150 ".globl _sun3_map_test_end\n"
151 "_sun3_map_test_end:\n"
152 : "=a"(val), "=r"(ret)
153 : "a"(addr));
154
155 return ret;
156}
diff --git a/arch/m68k/mm/sun3mmu.c b/arch/m68k/mm/sun3mmu.c
new file mode 100644
index 000000000000..a47be196a47c
--- /dev/null
+++ b/arch/m68k/mm/sun3mmu.c
@@ -0,0 +1,102 @@
1/*
2 * linux/arch/m68k/mm/sun3mmu.c
3 *
4 * Implementations of mm routines specific to the sun3 MMU.
5 *
6 * Moved here 8/20/1999 Sam Creasey
7 *
8 */
9
10#include <linux/signal.h>
11#include <linux/sched.h>
12#include <linux/mm.h>
13#include <linux/swap.h>
14#include <linux/kernel.h>
15#include <linux/string.h>
16#include <linux/types.h>
17#include <linux/init.h>
18#include <linux/bootmem.h>
19
20#include <asm/setup.h>
21#include <asm/uaccess.h>
22#include <asm/page.h>
23#include <asm/pgtable.h>
24#include <asm/system.h>
25#include <asm/machdep.h>
26#include <asm/io.h>
27
28extern void mmu_emu_init (unsigned long bootmem_end);
29
30const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
31
32extern unsigned long num_pages;
33
34void free_initmem(void)
35{
36}
37
38/* For the sun3 we try to follow the i386 paging_init() more closely */
39/* start_mem and end_mem have PAGE_OFFSET added already */
40/* now sets up tables using sun3 PTEs rather than i386 as before. --m */
41void __init paging_init(void)
42{
43 pgd_t * pg_dir;
44 pte_t * pg_table;
45 int i;
46 unsigned long address;
47 unsigned long next_pgtable;
48 unsigned long bootmem_end;
49 unsigned long zones_size[3] = {0, 0, 0};
50 unsigned long size;
51
52
53#ifdef TEST_VERIFY_AREA
54 wp_works_ok = 0;
55#endif
56 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
57 memset(empty_zero_page, 0, PAGE_SIZE);
58
59 address = PAGE_OFFSET;
60 pg_dir = swapper_pg_dir;
61 memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
62 memset (kernel_pg_dir, 0, sizeof (kernel_pg_dir));
63
64 size = num_pages * sizeof(pte_t);
65 size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
66
67 next_pgtable = (unsigned long)alloc_bootmem_pages(size);
68 bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
69
70 /* Map whole memory from PAGE_OFFSET (0x0E000000) */
71 pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
72
73 while (address < (unsigned long)high_memory) {
74 pg_table = (pte_t *) __pa (next_pgtable);
75 next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
76 pgd_val(*pg_dir) = (unsigned long) pg_table;
77 pg_dir++;
78
79 /* now change pg_table to kernel virtual addresses */
80 pg_table = (pte_t *) __va ((unsigned long) pg_table);
81 for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
82 pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
83 if (address >= (unsigned long)high_memory)
84 pte_val (pte) = 0;
85 set_pte (pg_table, pte);
86 address += PAGE_SIZE;
87 }
88 }
89
90 mmu_emu_init(bootmem_end);
91
92 current->mm = NULL;
93
94 /* memory sizing is a hack stolen from motorola.c.. hope it works for us */
95 zones_size[0] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT;
96 zones_size[1] = 0;
97
98 free_area_init(zones_size);
99
100}
101
102
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-20 02:32:34 -0400