1 // SPDX-License-Identifier: GPL-2.0-or-later
4 #include <linux/slab.h>
5 #include <linux/mmzone.h>
6 #include <linux/vmalloc.h>
7 #include <asm/io-workarounds.h>
9 unsigned long ioremap_bot;
10 EXPORT_SYMBOL(ioremap_bot);
12 void __iomem *ioremap(phys_addr_t addr, unsigned long size)
14 pgprot_t prot = pgprot_noncached(PAGE_KERNEL);
15 void *caller = __builtin_return_address(0);
18 return iowa_ioremap(addr, size, prot, caller);
19 return __ioremap_caller(addr, size, prot, caller);
21 EXPORT_SYMBOL(ioremap);
23 void __iomem *ioremap_wc(phys_addr_t addr, unsigned long size)
25 pgprot_t prot = pgprot_noncached_wc(PAGE_KERNEL);
26 void *caller = __builtin_return_address(0);
29 return iowa_ioremap(addr, size, prot, caller);
30 return __ioremap_caller(addr, size, prot, caller);
32 EXPORT_SYMBOL(ioremap_wc);
34 void __iomem *ioremap_coherent(phys_addr_t addr, unsigned long size)
36 pgprot_t prot = pgprot_cached(PAGE_KERNEL);
37 void *caller = __builtin_return_address(0);
40 return iowa_ioremap(addr, size, prot, caller);
41 return __ioremap_caller(addr, size, prot, caller);
44 void __iomem *ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags)
46 pte_t pte = __pte(flags);
47 void *caller = __builtin_return_address(0);
49 /* writeable implies dirty for kernel addresses */
51 pte = pte_mkdirty(pte);
53 /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
54 pte = pte_exprotect(pte);
55 pte = pte_mkprivileged(pte);
58 return iowa_ioremap(addr, size, pte_pgprot(pte), caller);
59 return __ioremap_caller(addr, size, pte_pgprot(pte), caller);
61 EXPORT_SYMBOL(ioremap_prot);
63 int early_ioremap_range(unsigned long ea, phys_addr_t pa,
64 unsigned long size, pgprot_t prot)
68 for (i = 0; i < size; i += PAGE_SIZE) {
69 int err = map_kernel_page(ea + i, pa + i, prot);
71 if (WARN_ON_ONCE(err)) /* Should clean up */
78 void __iomem *do_ioremap(phys_addr_t pa, phys_addr_t offset, unsigned long size,
79 pgprot_t prot, void *caller)
81 struct vm_struct *area;
85 area = __get_vm_area_caller(size, VM_IOREMAP, IOREMAP_START, IOREMAP_END, caller);
90 va = (unsigned long)area->addr;
92 ret = ioremap_page_range(va, va + size, pa, prot);
94 return (void __iomem *)area->addr + offset;
96 vunmap_range(va, va + size);