1 // SPDX-License-Identifier: GPL-2.0-or-later
4 #include <linux/slab.h>
5 #include <linux/vmalloc.h>
6 #include <asm/io-workarounds.h>
8 unsigned long ioremap_bot;
9 EXPORT_SYMBOL(ioremap_bot);
11 void __iomem *ioremap(phys_addr_t addr, unsigned long size)
13 pgprot_t prot = pgprot_noncached(PAGE_KERNEL);
14 void *caller = __builtin_return_address(0);
17 return iowa_ioremap(addr, size, prot, caller);
18 return __ioremap_caller(addr, size, prot, caller);
20 EXPORT_SYMBOL(ioremap);
22 void __iomem *ioremap_wc(phys_addr_t addr, unsigned long size)
24 pgprot_t prot = pgprot_noncached_wc(PAGE_KERNEL);
25 void *caller = __builtin_return_address(0);
28 return iowa_ioremap(addr, size, prot, caller);
29 return __ioremap_caller(addr, size, prot, caller);
31 EXPORT_SYMBOL(ioremap_wc);
33 void __iomem *ioremap_coherent(phys_addr_t addr, unsigned long size)
35 pgprot_t prot = pgprot_cached(PAGE_KERNEL);
36 void *caller = __builtin_return_address(0);
39 return iowa_ioremap(addr, size, prot, caller);
40 return __ioremap_caller(addr, size, prot, caller);
43 void __iomem *ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags)
45 pte_t pte = __pte(flags);
46 void *caller = __builtin_return_address(0);
48 /* writeable implies dirty for kernel addresses */
50 pte = pte_mkdirty(pte);
52 /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
53 pte = pte_exprotect(pte);
54 pte = pte_mkprivileged(pte);
57 return iowa_ioremap(addr, size, pte_pgprot(pte), caller);
58 return __ioremap_caller(addr, size, pte_pgprot(pte), caller);
60 EXPORT_SYMBOL(ioremap_prot);
62 int early_ioremap_range(unsigned long ea, phys_addr_t pa,
63 unsigned long size, pgprot_t prot)
67 for (i = 0; i < size; i += PAGE_SIZE) {
68 int err = map_kernel_page(ea + i, pa + i, prot);
70 if (WARN_ON_ONCE(err)) /* Should clean up */
77 void __iomem *do_ioremap(phys_addr_t pa, phys_addr_t offset, unsigned long size,
78 pgprot_t prot, void *caller)
80 struct vm_struct *area;
84 area = __get_vm_area_caller(size, VM_IOREMAP, IOREMAP_START, IOREMAP_END, caller);
89 va = (unsigned long)area->addr;
91 ret = ioremap_page_range(va, va + size, pa, prot);
93 return (void __iomem *)area->addr + offset;
95 unmap_kernel_range(va, size);