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authorWang Kefeng <wangkefeng.wang@huawei.com>2021-12-03 10:26:31 +0100
committerRussell King (Oracle) <rmk+kernel@armlinux.org.uk>2021-12-17 11:34:36 +0000
commit0ba8695e3dfbbc78ed716805678119121d33a730 (patch)
tree867eadfe2d6cb47025985eb5718f6de1e710c4c0 /arch/arm/mm/pageattr.c
parentdcc0a8f6b69a42cdf557e1e554478204c139082d (diff)
ARM: 9164/1: mm: Provide set_memory_valid()
This function validates and invalidates PTE entries, it will be used in the later patch. Acked-by: Marco Elver <elver@google.com> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/mm/pageattr.c')
-rw-r--r--arch/arm/mm/pageattr.c42
1 files changed, 32 insertions, 10 deletions
diff --git a/arch/arm/mm/pageattr.c b/arch/arm/mm/pageattr.c
index 9790ae3a8c68..c3c34fe714b0 100644
--- a/arch/arm/mm/pageattr.c
+++ b/arch/arm/mm/pageattr.c
@@ -32,14 +32,31 @@ static bool in_range(unsigned long start, unsigned long size,
size <= range_end - start;
}
+/*
+ * This function assumes that the range is mapped with PAGE_SIZE pages.
+ */
+static int __change_memory_common(unsigned long start, unsigned long size,
+ pgprot_t set_mask, pgprot_t clear_mask)
+{
+ struct page_change_data data;
+ int ret;
+
+ data.set_mask = set_mask;
+ data.clear_mask = clear_mask;
+
+ ret = apply_to_page_range(&init_mm, start, size, change_page_range,
+ &data);
+
+ flush_tlb_kernel_range(start, start + size);
+ return ret;
+}
+
static int change_memory_common(unsigned long addr, int numpages,
pgprot_t set_mask, pgprot_t clear_mask)
{
unsigned long start = addr & PAGE_MASK;
unsigned long end = PAGE_ALIGN(addr) + numpages * PAGE_SIZE;
unsigned long size = end - start;
- int ret;
- struct page_change_data data;
WARN_ON_ONCE(start != addr);
@@ -50,14 +67,7 @@ static int change_memory_common(unsigned long addr, int numpages,
!in_range(start, size, VMALLOC_START, VMALLOC_END))
return -EINVAL;
- data.set_mask = set_mask;
- data.clear_mask = clear_mask;
-
- ret = apply_to_page_range(&init_mm, start, size, change_page_range,
- &data);
-
- flush_tlb_kernel_range(start, end);
- return ret;
+ return __change_memory_common(start, size, set_mask, clear_mask);
}
int set_memory_ro(unsigned long addr, int numpages)
@@ -87,3 +97,15 @@ int set_memory_x(unsigned long addr, int numpages)
__pgprot(0),
__pgprot(L_PTE_XN));
}
+
+int set_memory_valid(unsigned long addr, int numpages, int enable)
+{
+ if (enable)
+ return __change_memory_common(addr, PAGE_SIZE * numpages,
+ __pgprot(L_PTE_VALID),
+ __pgprot(0));
+ else
+ return __change_memory_common(addr, PAGE_SIZE * numpages,
+ __pgprot(0),
+ __pgprot(L_PTE_VALID));
+}