From: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
To: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 4/4] MIPS: mm: Clean up setup of protection map
Date: Fri, 13 Nov 2020 12:09:52 +0100 [thread overview]
Message-ID: <20201113110952.68086-4-tsbogend@alpha.franken.de> (raw)
In-Reply-To: <20201113110952.68086-1-tsbogend@alpha.franken.de>
Protection map difference between RIXI and non RIXI cpus is _PAGE_NO_EXEC
and _PAGE_NO_READ usage. Both already take care of cpu_has_rixi while
setting up the page bits. So we just need one setup of protection map
and can drop the now unused (and broken for RIXI) PAGE_* defines.
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---
arch/mips/include/asm/pgtable.h | 8 ------
arch/mips/mm/cache.c | 55 ++++++++++++++---------------------------
2 files changed, 18 insertions(+), 45 deletions(-)
diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
index e5ef0fdd4838..158ba3aa3bf1 100644
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -25,14 +25,6 @@
struct mm_struct;
struct vm_area_struct;
-#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_NO_READ | \
- _page_cachable_default)
-#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
- _page_cachable_default)
-#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_NO_EXEC | \
- _page_cachable_default)
-#define PAGE_READONLY __pgprot(_PAGE_PRESENT | \
- _page_cachable_default)
#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
_PAGE_GLOBAL | _page_cachable_default)
#define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index f66a8bfc030e..36bcf4e955e8 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -159,43 +159,24 @@ EXPORT_SYMBOL(_page_cachable_default);
static inline void setup_protection_map(void)
{
- if (cpu_has_rixi) {
- protection_map[0] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
- protection_map[1] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
- protection_map[2] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
- protection_map[3] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
- protection_map[4] = PM(_PAGE_PRESENT);
- protection_map[5] = PM(_PAGE_PRESENT);
- protection_map[6] = PM(_PAGE_PRESENT);
- protection_map[7] = PM(_PAGE_PRESENT);
-
- protection_map[8] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
- protection_map[9] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
- protection_map[10] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
- protection_map[11] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
- protection_map[12] = PM(_PAGE_PRESENT);
- protection_map[13] = PM(_PAGE_PRESENT);
- protection_map[14] = PM(_PAGE_PRESENT | _PAGE_WRITE);
- protection_map[15] = PM(_PAGE_PRESENT | _PAGE_WRITE);
-
- } else {
- protection_map[0] = PAGE_NONE;
- protection_map[1] = PAGE_READONLY;
- protection_map[2] = PAGE_COPY;
- protection_map[3] = PAGE_COPY;
- protection_map[4] = PAGE_READONLY;
- protection_map[5] = PAGE_READONLY;
- protection_map[6] = PAGE_COPY;
- protection_map[7] = PAGE_COPY;
- protection_map[8] = PAGE_NONE;
- protection_map[9] = PAGE_READONLY;
- protection_map[10] = PAGE_SHARED;
- protection_map[11] = PAGE_SHARED;
- protection_map[12] = PAGE_READONLY;
- protection_map[13] = PAGE_READONLY;
- protection_map[14] = PAGE_SHARED;
- protection_map[15] = PAGE_SHARED;
- }
+ protection_map[0] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
+ protection_map[1] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
+ protection_map[2] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
+ protection_map[3] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
+ protection_map[4] = PM(_PAGE_PRESENT);
+ protection_map[5] = PM(_PAGE_PRESENT);
+ protection_map[6] = PM(_PAGE_PRESENT);
+ protection_map[7] = PM(_PAGE_PRESENT);
+
+ protection_map[8] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
+ protection_map[9] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
+ protection_map[10] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE |
+ _PAGE_NO_READ);
+ protection_map[11] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
+ protection_map[12] = PM(_PAGE_PRESENT);
+ protection_map[13] = PM(_PAGE_PRESENT);
+ protection_map[14] = PM(_PAGE_PRESENT | _PAGE_WRITE);
+ protection_map[15] = PM(_PAGE_PRESENT | _PAGE_WRITE);
}
#undef PM
--
2.16.4
next prev parent reply other threads:[~2020-11-13 11:12 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-13 11:09 [PATCH 1/4] MIPS: vdso: Use vma page protection for remapping Thomas Bogendoerfer
2020-11-13 11:09 ` [PATCH 2/4] MIPS: kvm: Use vm_get_page_prot to get protection bits Thomas Bogendoerfer
2020-11-14 7:34 ` Huacai Chen
2020-11-16 12:30 ` Thomas Bogendoerfer
2020-11-17 1:18 ` Huacai Chen
2020-11-17 10:40 ` Thomas Bogendoerfer
2020-11-19 12:54 ` Thomas Bogendoerfer
2020-11-13 11:09 ` [PATCH 3/4] MIPS: mm: shorten lines by using macro Thomas Bogendoerfer
2020-11-19 12:54 ` Thomas Bogendoerfer
2020-11-13 11:09 ` Thomas Bogendoerfer [this message]
2020-11-19 12:54 ` [PATCH 4/4] MIPS: mm: Clean up setup of protection map Thomas Bogendoerfer
2020-12-12 16:29 ` Guenter Roeck
2020-12-14 15:32 ` Thomas Bogendoerfer
2020-11-19 12:53 ` [PATCH 1/4] MIPS: vdso: Use vma page protection for remapping Thomas Bogendoerfer
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