waterDataStatisticsCrossAssociation memoryOperation.h 袁明明 commit at 2021-03-12

waterDataStatisticsCrossAssociation/dataSharedMemory/memoryOperation.h

@@ -89,3 +89,108 @@ extern struct page *empty_zero_page;
 /* The following flags are only valid when !PRESENT */
 #define _PAGE_BIT_FILE		0 /* software: pagecache or swap? */
 
+#define _PAGE_WT		(1 << _PAGE_BIT_WT)
+#define _PAGE_DIRTY		(1 << _PAGE_BIT_DIRTY)
+#define _PAGE_EXECUTE		(1 << _PAGE_BIT_EXECUTE)
+#define _PAGE_RW		(1 << _PAGE_BIT_RW)
+#define _PAGE_USER		(1 << _PAGE_BIT_USER)
+#define _PAGE_BUFFER		(1 << _PAGE_BIT_BUFFER)
+#define _PAGE_GLOBAL		(1 << _PAGE_BIT_GLOBAL)
+#define _PAGE_CACHABLE		(1 << _PAGE_BIT_CACHABLE)
+
+/* Software flags */
+#define _PAGE_ACCESSED		(1 << _PAGE_BIT_ACCESSED)
+#define _PAGE_PRESENT		(1 << _PAGE_BIT_PRESENT)
+#define _PAGE_FILE		(1 << _PAGE_BIT_FILE)
+
+/*
+ * Page types, i.e. sizes. _PAGE_TYPE_NONE corresponds to what is
+ * usually called _PAGE_PROTNONE on other architectures.
+ *
+ * XXX: Find out if _PAGE_PROTNONE is equivalent with !_PAGE_USER. If
+ * so, we can encode all possible page sizes (although we can't really
+ * support 1K pages anyway due to the _PAGE_PRESENT and _PAGE_ACCESSED
+ * bits)
+ *
+ */
+#define _PAGE_TYPE_MASK		((1 << _PAGE_BIT_SZ0) | (1 << _PAGE_BIT_SZ1))
+#define _PAGE_TYPE_NONE		(0 << _PAGE_BIT_SZ0)
+#define _PAGE_TYPE_SMALL	(1 << _PAGE_BIT_SZ0)
+#define _PAGE_TYPE_MEDIUM	(2 << _PAGE_BIT_SZ0)
+#define _PAGE_TYPE_LARGE	(3 << _PAGE_BIT_SZ0)
+
+/*
+ * Mask which drop software flags. We currently can't handle more than
+ * 512 MiB of physical memory, so we can use bits 29-31 for other
+ * stuff.  With a fixed 4K page size, we can use bits 10-11 as well as
+ * bits 2-3 (SZ)
+ */
+#define _PAGE_FLAGS_HARDWARE_MASK	0xfffff3ff
+
+#define _PAGE_FLAGS_CACHE_MASK	(_PAGE_CACHABLE | _PAGE_BUFFER | _PAGE_WT)
+
+/* Flags that may be modified by software */
+#define _PAGE_CHG_MASK		(PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY \
+				 | _PAGE_FLAGS_CACHE_MASK)
+
+#define _PAGE_FLAGS_READ	(_PAGE_CACHABLE	| _PAGE_BUFFER)
+#define _PAGE_FLAGS_WRITE	(_PAGE_FLAGS_READ | _PAGE_RW | _PAGE_DIRTY)
+
+#define _PAGE_NORMAL(x)	__pgprot((x) | _PAGE_PRESENT | _PAGE_TYPE_SMALL	\
+				 | _PAGE_ACCESSED)
+
+#define PAGE_NONE	(_PAGE_ACCESSED | _PAGE_TYPE_NONE)
+#define PAGE_READ	(_PAGE_FLAGS_READ | _PAGE_USER)
+#define PAGE_EXEC	(_PAGE_FLAGS_READ | _PAGE_EXECUTE | _PAGE_USER)
+#define PAGE_WRITE	(_PAGE_FLAGS_WRITE | _PAGE_USER)
+#define PAGE_KERNEL	_PAGE_NORMAL(_PAGE_FLAGS_WRITE | _PAGE_EXECUTE | _PAGE_GLOBAL)
+#define PAGE_KERNEL_RO	_PAGE_NORMAL(_PAGE_FLAGS_READ | _PAGE_EXECUTE | _PAGE_GLOBAL)
+
+#define _PAGE_P(x)	_PAGE_NORMAL((x) & ~(_PAGE_RW | _PAGE_DIRTY))
+#define _PAGE_S(x)	_PAGE_NORMAL(x)
+
+#define PAGE_COPY	_PAGE_P(PAGE_WRITE | PAGE_READ)
+#define PAGE_SHARED	_PAGE_S(PAGE_WRITE | PAGE_READ)
+
+#ifndef __ASSEMBLY__
+/*
+ * The hardware supports flags for write- and execute access. Read is
+ * always allowed if the page is loaded into the TLB, so the "-w-",
+ * "--x" and "-wx" mappings are implemented as "rw-", "r-x" and "rwx",
+ * respectively.
+ *
+ * The "---" case is handled by software; the page will simply not be
+ * loaded into the TLB if the page type is _PAGE_TYPE_NONE.
+ */
+
+#define __P000	__pgprot(PAGE_NONE)
+#define __P001	_PAGE_P(PAGE_READ)
+#define __P010	_PAGE_P(PAGE_WRITE)
+#define __P011	_PAGE_P(PAGE_WRITE | PAGE_READ)
+#define __P100	_PAGE_P(PAGE_EXEC)
+#define __P101	_PAGE_P(PAGE_EXEC | PAGE_READ)
+#define __P110	_PAGE_P(PAGE_EXEC | PAGE_WRITE)
+#define __P111	_PAGE_P(PAGE_EXEC | PAGE_WRITE | PAGE_READ)
+
+#define __S000	__pgprot(PAGE_NONE)
+#define __S001	_PAGE_S(PAGE_READ)
+#define __S010	_PAGE_S(PAGE_WRITE)
+#define __S011	_PAGE_S(PAGE_WRITE | PAGE_READ)
+#define __S100	_PAGE_S(PAGE_EXEC)
+#define __S101	_PAGE_S(PAGE_EXEC | PAGE_READ)
+#define __S110	_PAGE_S(PAGE_EXEC | PAGE_WRITE)
+#define __S111	_PAGE_S(PAGE_EXEC | PAGE_WRITE | PAGE_READ)
+
+#define pte_none(x)	(!pte_val(x))
+#define pte_present(x)	(pte_val(x) & _PAGE_PRESENT)
+
+#define pte_clear(mm,addr,xp)					\
+	do {							\
+		set_pte_at(mm, addr, xp, __pte(0));		\
+	} while (0)
+
+/*
+ * The following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+static inline int pte_write(pte_t pte)