1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/m68k/mm/kmap.c
5 * Copyright (C) 1997 Roman Hodek
7 * 10/01/99 cleaned up the code and changing to the same interface
8 * used by other architectures /Roman Zippel
11 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/string.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/vmalloc.h>
19 #include <asm/setup.h>
20 #include <asm/segment.h>
22 #include <asm/pgalloc.h>
27 #define PTRTREESIZE (256*1024)
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 descriptors and we
32 * can't mix this with normal page descriptors, so we have to copy that code
33 * (mm/vmalloc.c) and return appropriately aligned addresses.
36 #ifdef CPU_M68040_OR_M68060_ONLY
38 #define IO_SIZE PAGE_SIZE
40 static inline struct vm_struct *get_io_area(unsigned long size)
42 return get_vm_area(size, VM_IOREMAP);
46 static inline void free_io_area(void *addr)
48 vfree((void *)(PAGE_MASK & (unsigned long)addr));
53 #define IO_SIZE (256*1024)
55 static struct vm_struct *iolist;
58 * __free_io_area unmaps nearly everything, so be careful
59 * Currently it doesn't free pointer/page tables anymore but this
60 * wasn't used anyway and might be added later.
62 static void __free_io_area(void *addr, unsigned long size)
64 unsigned long virtaddr = (unsigned long)addr;
71 while ((long)size > 0) {
72 pgd_dir = pgd_offset_k(virtaddr);
73 p4d_dir = p4d_offset(pgd_dir, virtaddr);
74 pud_dir = pud_offset(p4d_dir, virtaddr);
75 if (pud_bad(*pud_dir)) {
76 printk("iounmap: bad pud(%08lx)\n", pud_val(*pud_dir));
80 pmd_dir = pmd_offset(pud_dir, virtaddr);
82 #if CONFIG_PGTABLE_LEVELS == 3
83 if (CPU_IS_020_OR_030) {
84 int pmd_off = (virtaddr/PTRTREESIZE) & 15;
85 int pmd_type = pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK;
87 if (pmd_type == _PAGE_PRESENT) {
88 pmd_dir->pmd[pmd_off] = 0;
89 virtaddr += PTRTREESIZE;
92 } else if (pmd_type == 0)
97 if (pmd_bad(*pmd_dir)) {
98 printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
102 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
104 pte_val(*pte_dir) = 0;
105 virtaddr += PAGE_SIZE;
112 static struct vm_struct *get_io_area(unsigned long size)
115 struct vm_struct **p, *tmp, *area;
117 area = kmalloc(sizeof(*area), GFP_KERNEL);
121 for (p = &iolist; (tmp = *p) ; p = &tmp->next) {
122 if (size + addr < (unsigned long)tmp->addr)
124 if (addr > KMAP_END-size) {
128 addr = tmp->size + (unsigned long)tmp->addr;
130 area->addr = (void *)addr;
131 area->size = size + IO_SIZE;
137 static inline void free_io_area(void *addr)
139 struct vm_struct **p, *tmp;
143 addr = (void *)((unsigned long)addr & -IO_SIZE);
144 for (p = &iolist ; (tmp = *p) ; p = &tmp->next) {
145 if (tmp->addr == addr) {
147 /* remove gap added in get_io_area() */
148 __free_io_area(tmp->addr, tmp->size - IO_SIZE);
158 * Map some physical address range into the kernel address space.
160 /* Rewritten by Andreas Schwab to remove all races. */
162 void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
164 struct vm_struct *area;
165 unsigned long virtaddr, retaddr;
174 * Don't allow mappings that wrap..
176 if (!size || physaddr > (unsigned long)(-size))
181 if ((physaddr >= 0x40000000) && (physaddr + size < 0x60000000)
182 && (cacheflag == IOMAP_NOCACHE_SER))
183 return (void __iomem *)physaddr;
186 #ifdef CONFIG_COLDFIRE
187 if (__cf_internalio(physaddr))
188 return (void __iomem *) physaddr;
192 printk("ioremap: 0x%lx,0x%lx(%d) - ", physaddr, size, cacheflag);
195 * Mappings have to be aligned
197 offset = physaddr & (IO_SIZE - 1);
198 physaddr &= -IO_SIZE;
199 size = (size + offset + IO_SIZE - 1) & -IO_SIZE;
204 area = get_io_area(size);
208 virtaddr = (unsigned long)area->addr;
209 retaddr = virtaddr + offset;
211 printk("0x%lx,0x%lx,0x%lx", physaddr, virtaddr, retaddr);
215 * add cache and table flags to physical address
217 if (CPU_IS_040_OR_060) {
218 physaddr |= (_PAGE_PRESENT | _PAGE_GLOBAL040 |
219 _PAGE_ACCESSED | _PAGE_DIRTY);
221 case IOMAP_FULL_CACHING:
222 physaddr |= _PAGE_CACHE040;
224 case IOMAP_NOCACHE_SER:
226 physaddr |= _PAGE_NOCACHE_S;
228 case IOMAP_NOCACHE_NONSER:
229 physaddr |= _PAGE_NOCACHE;
231 case IOMAP_WRITETHROUGH:
232 physaddr |= _PAGE_CACHE040W;
236 physaddr |= (_PAGE_PRESENT | _PAGE_ACCESSED |
237 _PAGE_DIRTY | _PAGE_READWRITE);
239 case IOMAP_NOCACHE_SER:
240 case IOMAP_NOCACHE_NONSER:
242 physaddr |= _PAGE_NOCACHE030;
244 case IOMAP_FULL_CACHING:
245 case IOMAP_WRITETHROUGH:
250 while ((long)size > 0) {
252 if (!(virtaddr & (PTRTREESIZE-1)))
253 printk ("\npa=%#lx va=%#lx ", physaddr, virtaddr);
255 pgd_dir = pgd_offset_k(virtaddr);
256 p4d_dir = p4d_offset(pgd_dir, virtaddr);
257 pud_dir = pud_offset(p4d_dir, virtaddr);
258 pmd_dir = pmd_alloc(&init_mm, pud_dir, virtaddr);
260 printk("ioremap: no mem for pmd_dir\n");
264 #if CONFIG_PGTABLE_LEVELS == 3
265 if (CPU_IS_020_OR_030) {
266 pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr;
267 physaddr += PTRTREESIZE;
268 virtaddr += PTRTREESIZE;
273 pte_dir = pte_alloc_kernel(pmd_dir, virtaddr);
275 printk("ioremap: no mem for pte_dir\n");
279 pte_val(*pte_dir) = physaddr;
280 virtaddr += PAGE_SIZE;
281 physaddr += PAGE_SIZE;
290 return (void __iomem *)retaddr;
292 EXPORT_SYMBOL(__ioremap);
295 * Unmap an ioremap()ed region again
297 void iounmap(void __iomem *addr)
300 if ((!MACH_IS_AMIGA) ||
301 (((unsigned long)addr < 0x40000000) ||
302 ((unsigned long)addr > 0x60000000)))
303 free_io_area((__force void *)addr);
305 #ifdef CONFIG_COLDFIRE
306 if (cf_internalio(addr))
309 free_io_area((__force void *)addr);
312 EXPORT_SYMBOL(iounmap);
315 * Set new cache mode for some kernel address space.
316 * The caller must push data for that range itself, if such data may already
319 void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
321 unsigned long virtaddr = (unsigned long)addr;
328 if (CPU_IS_040_OR_060) {
330 case IOMAP_FULL_CACHING:
331 cmode = _PAGE_CACHE040;
333 case IOMAP_NOCACHE_SER:
335 cmode = _PAGE_NOCACHE_S;
337 case IOMAP_NOCACHE_NONSER:
338 cmode = _PAGE_NOCACHE;
340 case IOMAP_WRITETHROUGH:
341 cmode = _PAGE_CACHE040W;
346 case IOMAP_NOCACHE_SER:
347 case IOMAP_NOCACHE_NONSER:
349 cmode = _PAGE_NOCACHE030;
351 case IOMAP_FULL_CACHING:
352 case IOMAP_WRITETHROUGH:
357 while ((long)size > 0) {
358 pgd_dir = pgd_offset_k(virtaddr);
359 p4d_dir = p4d_offset(pgd_dir, virtaddr);
360 pud_dir = pud_offset(p4d_dir, virtaddr);
361 if (pud_bad(*pud_dir)) {
362 printk("iocachemode: bad pud(%08lx)\n", pud_val(*pud_dir));
366 pmd_dir = pmd_offset(pud_dir, virtaddr);
368 #if CONFIG_PGTABLE_LEVELS == 3
369 if (CPU_IS_020_OR_030) {
370 int pmd_off = (virtaddr/PTRTREESIZE) & 15;
372 if ((pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK) == _PAGE_PRESENT) {
373 pmd_dir->pmd[pmd_off] = (pmd_dir->pmd[pmd_off] &
374 _CACHEMASK040) | cmode;
375 virtaddr += PTRTREESIZE;
382 if (pmd_bad(*pmd_dir)) {
383 printk("iocachemode: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
387 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
389 pte_val(*pte_dir) = (pte_val(*pte_dir) & _CACHEMASK040) | cmode;
390 virtaddr += PAGE_SIZE;
396 EXPORT_SYMBOL(kernel_set_cachemode);