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authorHiroshi DOYU <Hiroshi.DOYU@nokia.com>2009-01-28 21:32:08 +0200
committerHiroshi DOYU <Hiroshi.DOYU@nokia.com>2009-05-19 08:23:49 +0300
commit69d3a84a646d6ad6cd693a7a3d5b9af414113d2c (patch)
tree3fe2ec29cc83ff07ae0d07df6b51c52a59a3944e /arch/arm/mm/mmu.c
parent066aa9c1e3d0af52619fe26f05810990ff381d8c (diff)
downloadop-kernel-dev-69d3a84a646d6ad6cd693a7a3d5b9af414113d2c.zip
op-kernel-dev-69d3a84a646d6ad6cd693a7a3d5b9af414113d2c.tar.gz
omap iommu: simple virtual address space management
This patch provides a device drivers, which has a omap iommu, with address mapping APIs between device virtual address(iommu), physical address and MPU virtual address. There are 4 possible patterns for iommu virtual address(iova/da) mapping. |iova/ mapping iommu_ page | da pa va (d)-(p)-(v) function type --------------------------------------------------------------------------- 1 | c c c 1 - 1 - 1 _kmap() / _kunmap() s 2 | c c,a c 1 - 1 - 1 _kmalloc()/ _kfree() s 3 | c d c 1 - n - 1 _vmap() / _vunmap() s 4 | c d,a c 1 - n - 1 _vmalloc()/ _vfree() n* 'iova': device iommu virtual address 'da': alias of 'iova' 'pa': physical address 'va': mpu virtual address 'c': contiguous memory area 'd': dicontiguous memory area 'a': anonymous memory allocation '()': optional feature 'n': a normal page(4KB) size is used. 's': multiple iommu superpage(16MB, 1MB, 64KB, 4KB) size is used. '*': not yet, but feasible. Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
Diffstat (limited to 'arch/arm/mm/mmu.c')
-rw-r--r--arch/arm/mm/mmu.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index e6344ec..70974d7 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -255,6 +255,7 @@ const struct mem_type *get_mem_type(unsigned int type)
{
return type < ARRAY_SIZE(mem_types) ? &mem_types[type] : NULL;
}
+EXPORT_SYMBOL(get_mem_type);
/*
* Adjust the PMD section entries according to the CPU in use.
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