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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ioport.c: Simple io mapping allocator.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
7 *
8 * 1996: sparc_free_io, 1999: ioremap()/iounmap() by Pete Zaitcev.
9 *
10 * 2000/01/29
11 * <rth> zait: as long as pci_alloc_consistent produces something addressable,
12 * things are ok.
13 * <zaitcev> rth: no, it is relevant, because get_free_pages returns you a
14 * pointer into the big page mapping
15 * <rth> zait: so what?
16 * <rth> zait: remap_it_my_way(virt_to_phys(get_free_page()))
17 * <zaitcev> Hmm
18 * <zaitcev> Suppose I did this remap_it_my_way(virt_to_phys(get_free_page())).
19 * So far so good.
20 * <zaitcev> Now, driver calls pci_free_consistent(with result of
21 * remap_it_my_way()).
22 * <zaitcev> How do you find the address to pass to free_pages()?
23 * <rth> zait: walk the page tables? It's only two or three level after all.
24 * <rth> zait: you have to walk them anyway to remove the mapping.
25 * <zaitcev> Hmm
26 * <zaitcev> Sounds reasonable
27 */
28
29#include <linux/module.h>
30#include <linux/sched.h>
31#include <linux/kernel.h>
32#include <linux/errno.h>
33#include <linux/types.h>
34#include <linux/ioport.h>
35#include <linux/mm.h>
36#include <linux/slab.h>
37#include <linux/pci.h> /* struct pci_dev */
38#include <linux/proc_fs.h>
39#include <linux/seq_file.h>
40#include <linux/scatterlist.h>
41#include <linux/dma-map-ops.h>
42#include <linux/of_device.h>
43
44#include <asm/io.h>
45#include <asm/vaddrs.h>
46#include <asm/oplib.h>
47#include <asm/prom.h>
48#include <asm/page.h>
49#include <asm/pgalloc.h>
50#include <asm/dma.h>
51#include <asm/iommu.h>
52#include <asm/io-unit.h>
53#include <asm/leon.h>
54
55static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz);
56static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
57 unsigned long size, char *name);
58static void _sparc_free_io(struct resource *res);
59
60static void register_proc_sparc_ioport(void);
61
62/* This points to the next to use virtual memory for DVMA mappings */
63static struct resource _sparc_dvma = {
64 .name = "sparc_dvma", .start = DVMA_VADDR, .end = DVMA_END - 1
65};
66/* This points to the start of I/O mappings, cluable from outside. */
67/*ext*/ struct resource sparc_iomap = {
68 .name = "sparc_iomap", .start = IOBASE_VADDR, .end = IOBASE_END - 1
69};
70
71/*
72 * Our mini-allocator...
73 * Boy this is gross! We need it because we must map I/O for
74 * timers and interrupt controller before the kmalloc is available.
75 */
76
77#define XNMLN 15
78#define XNRES 10 /* SS-10 uses 8 */
79
80struct xresource {
81 struct resource xres; /* Must be first */
82 int xflag; /* 1 == used */
83 char xname[XNMLN+1];
84};
85
86static struct xresource xresv[XNRES];
87
88static struct xresource *xres_alloc(void) {
89 struct xresource *xrp;
90 int n;
91
92 xrp = xresv;
93 for (n = 0; n < XNRES; n++) {
94 if (xrp->xflag == 0) {
95 xrp->xflag = 1;
96 return xrp;
97 }
98 xrp++;
99 }
100 return NULL;
101}
102
103static void xres_free(struct xresource *xrp) {
104 xrp->xflag = 0;
105}
106
107/*
108 * These are typically used in PCI drivers
109 * which are trying to be cross-platform.
110 *
111 * Bus type is always zero on IIep.
112 */
113void __iomem *ioremap(phys_addr_t offset, size_t size)
114{
115 char name[14];
116
117 sprintf(name, "phys_%08x", (u32)offset);
118 return _sparc_alloc_io(0, (unsigned long)offset, size, name);
119}
120EXPORT_SYMBOL(ioremap);
121
122/*
123 * Complementary to ioremap().
124 */
125void iounmap(volatile void __iomem *virtual)
126{
127 unsigned long vaddr = (unsigned long) virtual & PAGE_MASK;
128 struct resource *res;
129
130 /*
131 * XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case.
132 * This probably warrants some sort of hashing.
133 */
134 if ((res = lookup_resource(&sparc_iomap, vaddr)) == NULL) {
135 printk("free_io/iounmap: cannot free %lx\n", vaddr);
136 return;
137 }
138 _sparc_free_io(res);
139
140 if ((char *)res >= (char*)xresv && (char *)res < (char *)&xresv[XNRES]) {
141 xres_free((struct xresource *)res);
142 } else {
143 kfree(res);
144 }
145}
146EXPORT_SYMBOL(iounmap);
147
148void __iomem *of_ioremap(struct resource *res, unsigned long offset,
149 unsigned long size, char *name)
150{
151 return _sparc_alloc_io(res->flags & 0xF,
152 res->start + offset,
153 size, name);
154}
155EXPORT_SYMBOL(of_ioremap);
156
157void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
158{
159 iounmap(base);
160}
161EXPORT_SYMBOL(of_iounmap);
162
163/*
164 * Meat of mapping
165 */
166static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
167 unsigned long size, char *name)
168{
169 static int printed_full;
170 struct xresource *xres;
171 struct resource *res;
172 char *tack;
173 int tlen;
174 void __iomem *va; /* P3 diag */
175
176 if (name == NULL) name = "???";
177
178 if ((xres = xres_alloc()) != NULL) {
179 tack = xres->xname;
180 res = &xres->xres;
181 } else {
182 if (!printed_full) {
183 printk("ioremap: done with statics, switching to malloc\n");
184 printed_full = 1;
185 }
186 tlen = strlen(name);
187 tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL);
188 if (tack == NULL) return NULL;
189 memset(tack, 0, sizeof(struct resource));
190 res = (struct resource *) tack;
191 tack += sizeof (struct resource);
192 }
193
194 strlcpy(tack, name, XNMLN+1);
195 res->name = tack;
196
197 va = _sparc_ioremap(res, busno, phys, size);
198 /* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); */ /* P3 diag */
199 return va;
200}
201
202/*
203 */
204static void __iomem *
205_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz)
206{
207 unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
208
209 if (allocate_resource(&sparc_iomap, res,
210 (offset + sz + PAGE_SIZE-1) & PAGE_MASK,
211 sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) {
212 /* Usually we cannot see printks in this case. */
213 prom_printf("alloc_io_res(%s): cannot occupy\n",
214 (res->name != NULL)? res->name: "???");
215 prom_halt();
216 }
217
218 pa &= PAGE_MASK;
219 srmmu_mapiorange(bus, pa, res->start, resource_size(res));
220
221 return (void __iomem *)(unsigned long)(res->start + offset);
222}
223
224/*
225 * Complementary to _sparc_ioremap().
226 */
227static void _sparc_free_io(struct resource *res)
228{
229 unsigned long plen;
230
231 plen = resource_size(res);
232 BUG_ON((plen & (PAGE_SIZE-1)) != 0);
233 srmmu_unmapiorange(res->start, plen);
234 release_resource(res);
235}
236
237unsigned long sparc_dma_alloc_resource(struct device *dev, size_t len)
238{
239 struct resource *res;
240
241 res = kzalloc(sizeof(*res), GFP_KERNEL);
242 if (!res)
243 return 0;
244 res->name = dev->of_node->full_name;
245
246 if (allocate_resource(&_sparc_dvma, res, len, _sparc_dvma.start,
247 _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
248 printk("%s: cannot occupy 0x%zx", __func__, len);
249 kfree(res);
250 return 0;
251 }
252
253 return res->start;
254}
255
256bool sparc_dma_free_resource(void *cpu_addr, size_t size)
257{
258 unsigned long addr = (unsigned long)cpu_addr;
259 struct resource *res;
260
261 res = lookup_resource(&_sparc_dvma, addr);
262 if (!res) {
263 printk("%s: cannot free %p\n", __func__, cpu_addr);
264 return false;
265 }
266
267 if ((addr & (PAGE_SIZE - 1)) != 0) {
268 printk("%s: unaligned va %p\n", __func__, cpu_addr);
269 return false;
270 }
271
272 size = PAGE_ALIGN(size);
273 if (resource_size(res) != size) {
274 printk("%s: region 0x%lx asked 0x%zx\n",
275 __func__, (long)resource_size(res), size);
276 return false;
277 }
278
279 release_resource(res);
280 kfree(res);
281 return true;
282}
283
284#ifdef CONFIG_SBUS
285
286void sbus_set_sbus64(struct device *dev, int x)
287{
288 printk("sbus_set_sbus64: unsupported\n");
289}
290EXPORT_SYMBOL(sbus_set_sbus64);
291
292static int __init sparc_register_ioport(void)
293{
294 register_proc_sparc_ioport();
295
296 return 0;
297}
298
299arch_initcall(sparc_register_ioport);
300
301#endif /* CONFIG_SBUS */
302
303/*
304 * IIep is write-through, not flushing on cpu to device transfer.
305 *
306 * On LEON systems without cache snooping, the entire D-CACHE must be flushed to
307 * make DMA to cacheable memory coherent.
308 */
309void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
310 enum dma_data_direction dir)
311{
312 if (dir != DMA_TO_DEVICE &&
313 sparc_cpu_model == sparc_leon &&
314 !sparc_leon3_snooping_enabled())
315 leon_flush_dcache_all();
316}
317
318#ifdef CONFIG_PROC_FS
319
320static int sparc_io_proc_show(struct seq_file *m, void *v)
321{
322 struct resource *root = m->private, *r;
323 const char *nm;
324
325 for (r = root->child; r != NULL; r = r->sibling) {
326 if ((nm = r->name) == NULL) nm = "???";
327 seq_printf(m, "%016llx-%016llx: %s\n",
328 (unsigned long long)r->start,
329 (unsigned long long)r->end, nm);
330 }
331
332 return 0;
333}
334#endif /* CONFIG_PROC_FS */
335
336static void register_proc_sparc_ioport(void)
337{
338#ifdef CONFIG_PROC_FS
339 proc_create_single_data("io_map", 0, NULL, sparc_io_proc_show,
340 &sparc_iomap);
341 proc_create_single_data("dvma_map", 0, NULL, sparc_io_proc_show,
342 &_sparc_dvma);
343#endif
344}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ioport.c: Simple io mapping allocator.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
7 *
8 * 1996: sparc_free_io, 1999: ioremap()/iounmap() by Pete Zaitcev.
9 *
10 * 2000/01/29
11 * <rth> zait: as long as pci_alloc_consistent produces something addressable,
12 * things are ok.
13 * <zaitcev> rth: no, it is relevant, because get_free_pages returns you a
14 * pointer into the big page mapping
15 * <rth> zait: so what?
16 * <rth> zait: remap_it_my_way(virt_to_phys(get_free_page()))
17 * <zaitcev> Hmm
18 * <zaitcev> Suppose I did this remap_it_my_way(virt_to_phys(get_free_page())).
19 * So far so good.
20 * <zaitcev> Now, driver calls pci_free_consistent(with result of
21 * remap_it_my_way()).
22 * <zaitcev> How do you find the address to pass to free_pages()?
23 * <rth> zait: walk the page tables? It's only two or three level after all.
24 * <rth> zait: you have to walk them anyway to remove the mapping.
25 * <zaitcev> Hmm
26 * <zaitcev> Sounds reasonable
27 */
28
29#include <linux/module.h>
30#include <linux/sched.h>
31#include <linux/kernel.h>
32#include <linux/errno.h>
33#include <linux/types.h>
34#include <linux/ioport.h>
35#include <linux/mm.h>
36#include <linux/slab.h>
37#include <linux/pci.h> /* struct pci_dev */
38#include <linux/proc_fs.h>
39#include <linux/seq_file.h>
40#include <linux/scatterlist.h>
41#include <linux/dma-map-ops.h>
42#include <linux/of_device.h>
43
44#include <asm/io.h>
45#include <asm/vaddrs.h>
46#include <asm/oplib.h>
47#include <asm/prom.h>
48#include <asm/page.h>
49#include <asm/pgalloc.h>
50#include <asm/dma.h>
51#include <asm/iommu.h>
52#include <asm/io-unit.h>
53#include <asm/leon.h>
54
55/* This function must make sure that caches and memory are coherent after DMA
56 * On LEON systems without cache snooping it flushes the entire D-CACHE.
57 */
58static inline void dma_make_coherent(unsigned long pa, unsigned long len)
59{
60 if (sparc_cpu_model == sparc_leon) {
61 if (!sparc_leon3_snooping_enabled())
62 leon_flush_dcache_all();
63 }
64}
65
66static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz);
67static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
68 unsigned long size, char *name);
69static void _sparc_free_io(struct resource *res);
70
71static void register_proc_sparc_ioport(void);
72
73/* This points to the next to use virtual memory for DVMA mappings */
74static struct resource _sparc_dvma = {
75 .name = "sparc_dvma", .start = DVMA_VADDR, .end = DVMA_END - 1
76};
77/* This points to the start of I/O mappings, cluable from outside. */
78/*ext*/ struct resource sparc_iomap = {
79 .name = "sparc_iomap", .start = IOBASE_VADDR, .end = IOBASE_END - 1
80};
81
82/*
83 * Our mini-allocator...
84 * Boy this is gross! We need it because we must map I/O for
85 * timers and interrupt controller before the kmalloc is available.
86 */
87
88#define XNMLN 15
89#define XNRES 10 /* SS-10 uses 8 */
90
91struct xresource {
92 struct resource xres; /* Must be first */
93 int xflag; /* 1 == used */
94 char xname[XNMLN+1];
95};
96
97static struct xresource xresv[XNRES];
98
99static struct xresource *xres_alloc(void) {
100 struct xresource *xrp;
101 int n;
102
103 xrp = xresv;
104 for (n = 0; n < XNRES; n++) {
105 if (xrp->xflag == 0) {
106 xrp->xflag = 1;
107 return xrp;
108 }
109 xrp++;
110 }
111 return NULL;
112}
113
114static void xres_free(struct xresource *xrp) {
115 xrp->xflag = 0;
116}
117
118/*
119 * These are typically used in PCI drivers
120 * which are trying to be cross-platform.
121 *
122 * Bus type is always zero on IIep.
123 */
124void __iomem *ioremap(phys_addr_t offset, size_t size)
125{
126 char name[14];
127
128 sprintf(name, "phys_%08x", (u32)offset);
129 return _sparc_alloc_io(0, (unsigned long)offset, size, name);
130}
131EXPORT_SYMBOL(ioremap);
132
133/*
134 * Complementary to ioremap().
135 */
136void iounmap(volatile void __iomem *virtual)
137{
138 unsigned long vaddr = (unsigned long) virtual & PAGE_MASK;
139 struct resource *res;
140
141 /*
142 * XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case.
143 * This probably warrants some sort of hashing.
144 */
145 if ((res = lookup_resource(&sparc_iomap, vaddr)) == NULL) {
146 printk("free_io/iounmap: cannot free %lx\n", vaddr);
147 return;
148 }
149 _sparc_free_io(res);
150
151 if ((char *)res >= (char*)xresv && (char *)res < (char *)&xresv[XNRES]) {
152 xres_free((struct xresource *)res);
153 } else {
154 kfree(res);
155 }
156}
157EXPORT_SYMBOL(iounmap);
158
159void __iomem *of_ioremap(struct resource *res, unsigned long offset,
160 unsigned long size, char *name)
161{
162 return _sparc_alloc_io(res->flags & 0xF,
163 res->start + offset,
164 size, name);
165}
166EXPORT_SYMBOL(of_ioremap);
167
168void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
169{
170 iounmap(base);
171}
172EXPORT_SYMBOL(of_iounmap);
173
174/*
175 * Meat of mapping
176 */
177static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
178 unsigned long size, char *name)
179{
180 static int printed_full;
181 struct xresource *xres;
182 struct resource *res;
183 char *tack;
184 int tlen;
185 void __iomem *va; /* P3 diag */
186
187 if (name == NULL) name = "???";
188
189 if ((xres = xres_alloc()) != NULL) {
190 tack = xres->xname;
191 res = &xres->xres;
192 } else {
193 if (!printed_full) {
194 printk("ioremap: done with statics, switching to malloc\n");
195 printed_full = 1;
196 }
197 tlen = strlen(name);
198 tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL);
199 if (tack == NULL) return NULL;
200 memset(tack, 0, sizeof(struct resource));
201 res = (struct resource *) tack;
202 tack += sizeof (struct resource);
203 }
204
205 strlcpy(tack, name, XNMLN+1);
206 res->name = tack;
207
208 va = _sparc_ioremap(res, busno, phys, size);
209 /* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); */ /* P3 diag */
210 return va;
211}
212
213/*
214 */
215static void __iomem *
216_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz)
217{
218 unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
219
220 if (allocate_resource(&sparc_iomap, res,
221 (offset + sz + PAGE_SIZE-1) & PAGE_MASK,
222 sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) {
223 /* Usually we cannot see printks in this case. */
224 prom_printf("alloc_io_res(%s): cannot occupy\n",
225 (res->name != NULL)? res->name: "???");
226 prom_halt();
227 }
228
229 pa &= PAGE_MASK;
230 srmmu_mapiorange(bus, pa, res->start, resource_size(res));
231
232 return (void __iomem *)(unsigned long)(res->start + offset);
233}
234
235/*
236 * Complementary to _sparc_ioremap().
237 */
238static void _sparc_free_io(struct resource *res)
239{
240 unsigned long plen;
241
242 plen = resource_size(res);
243 BUG_ON((plen & (PAGE_SIZE-1)) != 0);
244 srmmu_unmapiorange(res->start, plen);
245 release_resource(res);
246}
247
248unsigned long sparc_dma_alloc_resource(struct device *dev, size_t len)
249{
250 struct resource *res;
251
252 res = kzalloc(sizeof(*res), GFP_KERNEL);
253 if (!res)
254 return 0;
255 res->name = dev->of_node->full_name;
256
257 if (allocate_resource(&_sparc_dvma, res, len, _sparc_dvma.start,
258 _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
259 printk("%s: cannot occupy 0x%zx", __func__, len);
260 kfree(res);
261 return 0;
262 }
263
264 return res->start;
265}
266
267bool sparc_dma_free_resource(void *cpu_addr, size_t size)
268{
269 unsigned long addr = (unsigned long)cpu_addr;
270 struct resource *res;
271
272 res = lookup_resource(&_sparc_dvma, addr);
273 if (!res) {
274 printk("%s: cannot free %p\n", __func__, cpu_addr);
275 return false;
276 }
277
278 if ((addr & (PAGE_SIZE - 1)) != 0) {
279 printk("%s: unaligned va %p\n", __func__, cpu_addr);
280 return false;
281 }
282
283 size = PAGE_ALIGN(size);
284 if (resource_size(res) != size) {
285 printk("%s: region 0x%lx asked 0x%zx\n",
286 __func__, (long)resource_size(res), size);
287 return false;
288 }
289
290 release_resource(res);
291 kfree(res);
292 return true;
293}
294
295#ifdef CONFIG_SBUS
296
297void sbus_set_sbus64(struct device *dev, int x)
298{
299 printk("sbus_set_sbus64: unsupported\n");
300}
301EXPORT_SYMBOL(sbus_set_sbus64);
302
303static int __init sparc_register_ioport(void)
304{
305 register_proc_sparc_ioport();
306
307 return 0;
308}
309
310arch_initcall(sparc_register_ioport);
311
312#endif /* CONFIG_SBUS */
313
314
315/* Allocate and map kernel buffer using consistent mode DMA for a device.
316 * hwdev should be valid struct pci_dev pointer for PCI devices.
317 */
318void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
319 gfp_t gfp, unsigned long attrs)
320{
321 unsigned long addr;
322 void *va;
323
324 if (!size || size > 256 * 1024) /* __get_free_pages() limit */
325 return NULL;
326
327 size = PAGE_ALIGN(size);
328 va = (void *) __get_free_pages(gfp | __GFP_ZERO, get_order(size));
329 if (!va) {
330 printk("%s: no %zd pages\n", __func__, size >> PAGE_SHIFT);
331 return NULL;
332 }
333
334 addr = sparc_dma_alloc_resource(dev, size);
335 if (!addr)
336 goto err_nomem;
337
338 srmmu_mapiorange(0, virt_to_phys(va), addr, size);
339
340 *dma_handle = virt_to_phys(va);
341 return (void *)addr;
342
343err_nomem:
344 free_pages((unsigned long)va, get_order(size));
345 return NULL;
346}
347
348/* Free and unmap a consistent DMA buffer.
349 * cpu_addr is what was returned arch_dma_alloc, size must be the same as what
350 * was passed into arch_dma_alloc, and likewise dma_addr must be the same as
351 * what *dma_ndler was set to.
352 *
353 * References to the memory and mappings associated with cpu_addr/dma_addr
354 * past this call are illegal.
355 */
356void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
357 dma_addr_t dma_addr, unsigned long attrs)
358{
359 size = PAGE_ALIGN(size);
360
361 if (!sparc_dma_free_resource(cpu_addr, size))
362 return;
363
364 dma_make_coherent(dma_addr, size);
365 srmmu_unmapiorange((unsigned long)cpu_addr, size);
366 free_pages((unsigned long)phys_to_virt(dma_addr), get_order(size));
367}
368
369/* IIep is write-through, not flushing on cpu to device transfer. */
370
371void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
372 enum dma_data_direction dir)
373{
374 if (dir != PCI_DMA_TODEVICE)
375 dma_make_coherent(paddr, PAGE_ALIGN(size));
376}
377
378#ifdef CONFIG_PROC_FS
379
380static int sparc_io_proc_show(struct seq_file *m, void *v)
381{
382 struct resource *root = m->private, *r;
383 const char *nm;
384
385 for (r = root->child; r != NULL; r = r->sibling) {
386 if ((nm = r->name) == NULL) nm = "???";
387 seq_printf(m, "%016llx-%016llx: %s\n",
388 (unsigned long long)r->start,
389 (unsigned long long)r->end, nm);
390 }
391
392 return 0;
393}
394#endif /* CONFIG_PROC_FS */
395
396static void register_proc_sparc_ioport(void)
397{
398#ifdef CONFIG_PROC_FS
399 proc_create_single_data("io_map", 0, NULL, sparc_io_proc_show,
400 &sparc_iomap);
401 proc_create_single_data("dvma_map", 0, NULL, sparc_io_proc_show,
402 &_sparc_dvma);
403#endif
404}