From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/arch/sh/include/asm/pgtable.h | 50 ++++++++++++++++++++++++++++++--------------------
1 files changed, 30 insertions(+), 20 deletions(-)
diff --git a/kernel/arch/sh/include/asm/pgtable.h b/kernel/arch/sh/include/asm/pgtable.h
index f6abfe2..27751e9 100644
--- a/kernel/arch/sh/include/asm/pgtable.h
+++ b/kernel/arch/sh/include/asm/pgtable.h
@@ -1,13 +1,10 @@
-/*
+/* SPDX-License-Identifier: GPL-2.0
+ *
* This file contains the functions and defines necessary to modify and
* use the SuperH page table tree.
*
* Copyright (C) 1999 Niibe Yutaka
* Copyright (C) 2002 - 2007 Paul Mundt
- *
- * This file is subject to the terms and conditions of the GNU General
- * Public License. See the file "COPYING" in the main directory of this
- * archive for more details.
*/
#ifndef __ASM_SH_PGTABLE_H
#define __ASM_SH_PGTABLE_H
@@ -79,18 +76,10 @@
#define PTE_PHYS_MASK (phys_addr_mask() & PAGE_MASK)
#define PTE_FLAGS_MASK (~(PTE_PHYS_MASK) << PAGE_SHIFT)
-#ifdef CONFIG_SUPERH32
#define VMALLOC_START (P3SEG)
-#else
-#define VMALLOC_START (0xf0000000)
-#endif
#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
-#if defined(CONFIG_SUPERH32)
#include <asm/pgtable_32.h>
-#else
-#include <asm/pgtable_64.h>
-#endif
/*
* SH-X and lower (legacy) SuperH parts (SH-3, SH-4, some SH-4A) can't do page
@@ -126,11 +115,6 @@
#define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
-/*
- * Initialise the page table caches
- */
-extern void pgtable_cache_init(void);
-
struct vm_area_struct;
struct mm_struct;
@@ -152,10 +136,36 @@
extern void page_table_range_init(unsigned long start, unsigned long end,
pgd_t *pgd);
+static inline bool __pte_access_permitted(pte_t pte, u64 prot)
+{
+ return (pte_val(pte) & (prot | _PAGE_SPECIAL)) == prot;
+}
+
+#ifdef CONFIG_X2TLB
+static inline bool pte_access_permitted(pte_t pte, bool write)
+{
+ u64 prot = _PAGE_PRESENT;
+
+ prot |= _PAGE_EXT(_PAGE_EXT_KERN_READ | _PAGE_EXT_USER_READ);
+ if (write)
+ prot |= _PAGE_EXT(_PAGE_EXT_KERN_WRITE | _PAGE_EXT_USER_WRITE);
+ return __pte_access_permitted(pte, prot);
+}
+#else
+static inline bool pte_access_permitted(pte_t pte, bool write)
+{
+ u64 prot = _PAGE_PRESENT | _PAGE_USER;
+
+ if (write)
+ prot |= _PAGE_RW;
+ return __pte_access_permitted(pte, prot);
+}
+#endif
+
+#define pte_access_permitted pte_access_permitted
+
/* arch/sh/mm/mmap.c */
#define HAVE_ARCH_UNMAPPED_AREA
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
-
-#include <asm-generic/pgtable.h>
#endif /* __ASM_SH_PGTABLE_H */
--
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