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xtensa: add HIGHMEM support

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Introduce fixmap area just below the vmalloc region. Use it for atomic
mapping of high memory pages.
High memory on cores with cache aliasing is not supported and is still
to be implemented. Fail build for such configurations for now.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov
2014-02-04 02:17:09 +04:00
parent 04c6b3e2b5
commit 6555910065
9 changed files with 270 additions and 16 deletions
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7
arch/xtensa/mm/cache.c
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@@ -59,6 +59,10 @@
*
*/
#if (DCACHE_WAY_SIZE > PAGE_SIZE) && defined(CONFIG_HIGHMEM)
#error "HIGHMEM is not supported on cores with aliasing cache."
#endif
#if (DCACHE_WAY_SIZE > PAGE_SIZE) && XCHAL_DCACHE_IS_WRITEBACK
/*
@@ -179,10 +183,11 @@ update_mmu_cache(struct vm_area_struct * vma, unsigned long addr, pte_t *ptep)
#else
if (!PageReserved(page) && !test_bit(PG_arch_1, &page->flags)
&& (vma->vm_flags & VM_EXEC) != 0) {
unsigned long paddr = (unsigned long) page_address(page);
unsigned long paddr = (unsigned long)kmap_atomic(page);
__flush_dcache_page(paddr);
__invalidate_icache_page(paddr);
set_bit(PG_arch_1, &page->flags);
kunmap_atomic((void *)paddr);
}
#endif
}