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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/parisc/mm/ioremap.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/parisc/mm/ioremap.c')
-rw-r--r-- | kernel/arch/parisc/mm/ioremap.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/kernel/arch/parisc/mm/ioremap.c b/kernel/arch/parisc/mm/ioremap.c new file mode 100644 index 000000000..838d0259c --- /dev/null +++ b/kernel/arch/parisc/mm/ioremap.c @@ -0,0 +1,99 @@ +/* + * arch/parisc/mm/ioremap.c + * + * (C) Copyright 1995 1996 Linus Torvalds + * (C) Copyright 2001-2006 Helge Deller <deller@gmx.de> + * (C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org> + */ + +#include <linux/vmalloc.h> +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/io.h> +#include <asm/pgalloc.h> + +/* + * Generic mapping function (not visible outside): + */ + +/* + * Remap an arbitrary physical address space into the kernel virtual + * address space. + * + * NOTE! We need to allow non-page-aligned mappings too: we will obviously + * have to convert them into an offset in a page-aligned mapping, but the + * caller shouldn't need to know that small detail. + */ +void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags) +{ + void __iomem *addr; + struct vm_struct *area; + unsigned long offset, last_addr; + pgprot_t pgprot; + +#ifdef CONFIG_EISA + unsigned long end = phys_addr + size - 1; + /* Support EISA addresses */ + if ((phys_addr >= 0x00080000 && end < 0x000fffff) || + (phys_addr >= 0x00500000 && end < 0x03bfffff)) { + phys_addr |= F_EXTEND(0xfc000000); + flags |= _PAGE_NO_CACHE; + } +#endif + + /* Don't allow wraparound or zero size */ + last_addr = phys_addr + size - 1; + if (!size || last_addr < phys_addr) + return NULL; + + /* + * Don't allow anybody to remap normal RAM that we're using.. + */ + if (phys_addr < virt_to_phys(high_memory)) { + char *t_addr, *t_end; + struct page *page; + + t_addr = __va(phys_addr); + t_end = t_addr + (size - 1); + + for (page = virt_to_page(t_addr); + page <= virt_to_page(t_end); page++) { + if(!PageReserved(page)) + return NULL; + } + } + + pgprot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | + _PAGE_ACCESSED | flags); + + /* + * Mappings have to be page-aligned + */ + offset = phys_addr & ~PAGE_MASK; + phys_addr &= PAGE_MASK; + size = PAGE_ALIGN(last_addr + 1) - phys_addr; + + /* + * Ok, go for it.. + */ + area = get_vm_area(size, VM_IOREMAP); + if (!area) + return NULL; + + addr = (void __iomem *) area->addr; + if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size, + phys_addr, pgprot)) { + vfree(addr); + return NULL; + } + + return (void __iomem *) (offset + (char __iomem *)addr); +} +EXPORT_SYMBOL(__ioremap); + +void iounmap(const volatile void __iomem *addr) +{ + if (addr > high_memory) + return vfree((void *) (PAGE_MASK & (unsigned long __force) addr)); +} +EXPORT_SYMBOL(iounmap); |