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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/arch/m68k/mm/cache.c
4 *
5 * Instruction cache handling
6 *
7 * Copyright (C) 1995 Hamish Macdonald
8 */
9
10#include <linux/module.h>
11#include <asm/cacheflush.h>
12#include <asm/traps.h>
13
14
15static unsigned long virt_to_phys_slow(unsigned long vaddr)
16{
17 if (CPU_IS_060) {
18 unsigned long paddr;
19
20 /* The PLPAR instruction causes an access error if the translation
21 * is not possible. To catch this we use the same exception mechanism
22 * as for user space accesses in <asm/uaccess.h>. */
23 asm volatile (".chip 68060\n"
24 "1: plpar (%0)\n"
25 ".chip 68k\n"
26 "2:\n"
27 ".section .fixup,\"ax\"\n"
28 " .even\n"
29 "3: sub.l %0,%0\n"
30 " jra 2b\n"
31 ".previous\n"
32 ".section __ex_table,\"a\"\n"
33 " .align 4\n"
34 " .long 1b,3b\n"
35 ".previous"
36 : "=a" (paddr)
37 : "0" (vaddr));
38 return paddr;
39 } else if (CPU_IS_040) {
40 unsigned long mmusr;
41
42 asm volatile (".chip 68040\n\t"
43 "ptestr (%1)\n\t"
44 "movec %%mmusr, %0\n\t"
45 ".chip 68k"
46 : "=r" (mmusr)
47 : "a" (vaddr));
48
49 if (mmusr & MMU_R_040)
50 return (mmusr & PAGE_MASK) | (vaddr & ~PAGE_MASK);
51 } else {
52 WARN_ON_ONCE(!CPU_IS_040_OR_060);
53 }
54 return 0;
55}
56
57/* Push n pages at kernel virtual address and clear the icache */
58/* RZ: use cpush %bc instead of cpush %dc, cinv %ic */
59void flush_icache_user_range(unsigned long address, unsigned long endaddr)
60{
61 if (CPU_IS_COLDFIRE) {
62 unsigned long start, end;
63 start = address & ICACHE_SET_MASK;
64 end = endaddr & ICACHE_SET_MASK;
65 if (start > end) {
66 flush_cf_icache(0, end);
67 end = ICACHE_MAX_ADDR;
68 }
69 flush_cf_icache(start, end);
70 } else if (CPU_IS_040_OR_060) {
71 address &= PAGE_MASK;
72
73 do {
74 asm volatile ("nop\n\t"
75 ".chip 68040\n\t"
76 "cpushp %%bc,(%0)\n\t"
77 ".chip 68k"
78 : : "a" (virt_to_phys_slow(address)));
79 address += PAGE_SIZE;
80 } while (address < endaddr);
81 } else {
82 unsigned long tmp;
83 asm volatile ("movec %%cacr,%0\n\t"
84 "orw %1,%0\n\t"
85 "movec %0,%%cacr"
86 : "=&d" (tmp)
87 : "di" (FLUSH_I));
88 }
89}
90
91void flush_icache_range(unsigned long address, unsigned long endaddr)
92{
93 set_fc(SUPER_DATA);
94 flush_icache_user_range(address, endaddr);
95 set_fc(USER_DATA);
96}
97EXPORT_SYMBOL(flush_icache_range);
98
99void flush_icache_user_page(struct vm_area_struct *vma, struct page *page,
100 unsigned long addr, int len)
101{
102 if (CPU_IS_COLDFIRE) {
103 unsigned long start, end;
104 start = addr & ICACHE_SET_MASK;
105 end = (addr + len) & ICACHE_SET_MASK;
106 if (start > end) {
107 flush_cf_icache(0, end);
108 end = ICACHE_MAX_ADDR;
109 }
110 flush_cf_icache(start, end);
111
112 } else if (CPU_IS_040_OR_060) {
113 asm volatile ("nop\n\t"
114 ".chip 68040\n\t"
115 "cpushp %%bc,(%0)\n\t"
116 ".chip 68k"
117 : : "a" (page_to_phys(page)));
118 } else {
119 unsigned long tmp;
120 asm volatile ("movec %%cacr,%0\n\t"
121 "orw %1,%0\n\t"
122 "movec %0,%%cacr"
123 : "=&d" (tmp)
124 : "di" (FLUSH_I));
125 }
126}
127
1/*
2 * linux/arch/m68k/mm/cache.c
3 *
4 * Instruction cache handling
5 *
6 * Copyright (C) 1995 Hamish Macdonald
7 */
8
9#include <linux/module.h>
10#include <asm/pgalloc.h>
11#include <asm/traps.h>
12
13
14static unsigned long virt_to_phys_slow(unsigned long vaddr)
15{
16 if (CPU_IS_060) {
17 unsigned long paddr;
18
19 /* The PLPAR instruction causes an access error if the translation
20 * is not possible. To catch this we use the same exception mechanism
21 * as for user space accesses in <asm/uaccess.h>. */
22 asm volatile (".chip 68060\n"
23 "1: plpar (%0)\n"
24 ".chip 68k\n"
25 "2:\n"
26 ".section .fixup,\"ax\"\n"
27 " .even\n"
28 "3: sub.l %0,%0\n"
29 " jra 2b\n"
30 ".previous\n"
31 ".section __ex_table,\"a\"\n"
32 " .align 4\n"
33 " .long 1b,3b\n"
34 ".previous"
35 : "=a" (paddr)
36 : "0" (vaddr));
37 return paddr;
38 } else if (CPU_IS_040) {
39 unsigned long mmusr;
40
41 asm volatile (".chip 68040\n\t"
42 "ptestr (%1)\n\t"
43 "movec %%mmusr, %0\n\t"
44 ".chip 68k"
45 : "=r" (mmusr)
46 : "a" (vaddr));
47
48 if (mmusr & MMU_R_040)
49 return (mmusr & PAGE_MASK) | (vaddr & ~PAGE_MASK);
50 } else {
51 unsigned short mmusr;
52 unsigned long *descaddr;
53
54 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
55 "pmove %%psr,%1"
56 : "=a&" (descaddr), "=m" (mmusr)
57 : "a" (vaddr), "d" (get_fs().seg));
58 if (mmusr & (MMU_I|MMU_B|MMU_L))
59 return 0;
60 descaddr = phys_to_virt((unsigned long)descaddr);
61 switch (mmusr & MMU_NUM) {
62 case 1:
63 return (*descaddr & 0xfe000000) | (vaddr & 0x01ffffff);
64 case 2:
65 return (*descaddr & 0xfffc0000) | (vaddr & 0x0003ffff);
66 case 3:
67 return (*descaddr & PAGE_MASK) | (vaddr & ~PAGE_MASK);
68 }
69 }
70 return 0;
71}
72
73/* Push n pages at kernel virtual address and clear the icache */
74/* RZ: use cpush %bc instead of cpush %dc, cinv %ic */
75void flush_icache_range(unsigned long address, unsigned long endaddr)
76{
77 if (CPU_IS_COLDFIRE) {
78 unsigned long start, end;
79 start = address & ICACHE_SET_MASK;
80 end = endaddr & ICACHE_SET_MASK;
81 if (start > end) {
82 flush_cf_icache(0, end);
83 end = ICACHE_MAX_ADDR;
84 }
85 flush_cf_icache(start, end);
86 } else if (CPU_IS_040_OR_060) {
87 address &= PAGE_MASK;
88
89 do {
90 asm volatile ("nop\n\t"
91 ".chip 68040\n\t"
92 "cpushp %%bc,(%0)\n\t"
93 ".chip 68k"
94 : : "a" (virt_to_phys_slow(address)));
95 address += PAGE_SIZE;
96 } while (address < endaddr);
97 } else {
98 unsigned long tmp;
99 asm volatile ("movec %%cacr,%0\n\t"
100 "orw %1,%0\n\t"
101 "movec %0,%%cacr"
102 : "=&d" (tmp)
103 : "di" (FLUSH_I));
104 }
105}
106EXPORT_SYMBOL(flush_icache_range);
107
108void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
109 unsigned long addr, int len)
110{
111 if (CPU_IS_COLDFIRE) {
112 unsigned long start, end;
113 start = addr & ICACHE_SET_MASK;
114 end = (addr + len) & ICACHE_SET_MASK;
115 if (start > end) {
116 flush_cf_icache(0, end);
117 end = ICACHE_MAX_ADDR;
118 }
119 flush_cf_icache(start, end);
120
121 } else if (CPU_IS_040_OR_060) {
122 asm volatile ("nop\n\t"
123 ".chip 68040\n\t"
124 "cpushp %%bc,(%0)\n\t"
125 ".chip 68k"
126 : : "a" (page_to_phys(page)));
127 } else {
128 unsigned long tmp;
129 asm volatile ("movec %%cacr,%0\n\t"
130 "orw %1,%0\n\t"
131 "movec %0,%%cacr"
132 : "=&d" (tmp)
133 : "di" (FLUSH_I));
134 }
135}
136