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riscv: add ARCH_HAS_SET_DIRECT_MAP support

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Add set_direct_map_*() functions for setting the direct map alias for
the page to its default permissions and to an invalid state that cannot
be cached in a TLB. (See d253ca0c ("x86/mm/cpa: Add set_direct_map_*()
functions")) Add a similar implementation for RISC-V.

Signed-off-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Zong Li
2020-03-10 00:55:37 +08:00
committed by Palmer Dabbelt
parent d3ab332a50
commit 395a21ff85
3 changed files with 28 additions and 0 deletions
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24
arch/riscv/mm/pageattr.c
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@@ -148,3 +148,27 @@ int set_memory_nx(unsigned long addr, int numpages)
{
return __set_memory(addr, numpages, __pgprot(0), __pgprot(_PAGE_EXEC));
}
int set_direct_map_invalid_noflush(struct page *page)
{
unsigned long start = (unsigned long)page_address(page);
unsigned long end = start + PAGE_SIZE;
struct pageattr_masks masks = {
.set_mask = __pgprot(0),
.clear_mask = __pgprot(_PAGE_PRESENT)
};
return walk_page_range(&init_mm, start, end, &pageattr_ops, &masks);
}
int set_direct_map_default_noflush(struct page *page)
{
unsigned long start = (unsigned long)page_address(page);
unsigned long end = start + PAGE_SIZE;
struct pageattr_masks masks = {
.set_mask = PAGE_KERNEL,
.clear_mask = __pgprot(0)
};
return walk_page_range(&init_mm, start, end, &pageattr_ops, &masks);
}