1 files changed, 147 insertions, 0 deletions
diff --git a/include/asm-i386/tlbflush.h b/include/asm-i386/tlbflush.h
new file mode 100644
index 0000000..f22fab0
--- /dev/null
+++ b/include/asm-i386/tlbflush.h
@@ -0,0 +1,147 @@
+#ifndef _I386_TLBFLUSH_H
+#define _I386_TLBFLUSH_H
+
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <asm/processor.h>
+
+#define __flush_tlb()							\
+	do {								\
+		unsigned int tmpreg;					\
+									\
+		__asm__ __volatile__(					\
+			"movl %%cr3, %0;              \n"		\
+			"movl %0, %%cr3;  # flush TLB \n"		\
+			: "=r" (tmpreg)					\
+			:: "memory");					\
+	} while (0)
+
+/*
+ * Global pages have to be flushed a bit differently. Not a real
+ * performance problem because this does not happen often.
+ */
+#define __flush_tlb_global()						\
+	do {								\
+		unsigned int tmpreg;					\
+									\
+		__asm__ __volatile__(					\
+			"movl %1, %%cr4;  # turn off PGE     \n"	\
+			"movl %%cr3, %0;                     \n"	\
+			"movl %0, %%cr3;  # flush TLB        \n"	\
+			"movl %2, %%cr4;  # turn PGE back on \n"	\
+			: "=&r" (tmpreg)				\
+			: "r" (mmu_cr4_features & ~X86_CR4_PGE),	\
+			  "r" (mmu_cr4_features)			\
+			: "memory");					\
+	} while (0)
+
+extern unsigned long pgkern_mask;
+
+# define __flush_tlb_all()						\
+	do {								\
+		if (cpu_has_pge)					\
+			__flush_tlb_global();				\
+		else							\
+			__flush_tlb();					\
+	} while (0)
+
+#define cpu_has_invlpg	(boot_cpu_data.x86 > 3)
+
+#define __flush_tlb_single(addr) \
+	__asm__ __volatile__("invlpg %0": :"m" (*(char *) addr))
+
+#ifdef CONFIG_X86_INVLPG
+# define __flush_tlb_one(addr) __flush_tlb_single(addr)
+#else
+# define __flush_tlb_one(addr)						\
+	do {								\
+		if (cpu_has_invlpg)					\
+			__flush_tlb_single(addr);			\
+		else							\
+			__flush_tlb();					\
+	} while (0)
+#endif
+
+/*
+ * TLB flushing:
+ *
+ *  - flush_tlb() flushes the current mm struct TLBs
+ *  - flush_tlb_all() flushes all processes TLBs
+ *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
+ *  - flush_tlb_page(vma, vmaddr) flushes one page
+ *  - flush_tlb_range(vma, start, end) flushes a range of pages
+ *  - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
+ *  - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
+ *
+ * ..but the i386 has somewhat limited tlb flushing capabilities,
+ * and page-granular flushes are available only on i486 and up.
+ */
+
+#ifndef CONFIG_SMP
+
+#define flush_tlb() __flush_tlb()
+#define flush_tlb_all() __flush_tlb_all()
+#define local_flush_tlb() __flush_tlb()
+
+static inline void flush_tlb_mm(struct mm_struct *mm)
+{
+	if (mm == current->active_mm)
+		__flush_tlb();
+}
+
+static inline void flush_tlb_page(struct vm_area_struct *vma,
+	unsigned long addr)
+{
+	if (vma->vm_mm == current->active_mm)
+		__flush_tlb_one(addr);
+}
+
+static inline void flush_tlb_range(struct vm_area_struct *vma,
+	unsigned long start, unsigned long end)
+{
+	if (vma->vm_mm == current->active_mm)
+		__flush_tlb();
+}
+
+#else
+
+#include <asm/smp.h>
+
+#define local_flush_tlb() \
+	__flush_tlb()
+
+extern void flush_tlb_all(void);
+extern void flush_tlb_current_task(void);
+extern void flush_tlb_mm(struct mm_struct *);
+extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
+
+#define flush_tlb()	flush_tlb_current_task()
+
+static inline void flush_tlb_range(struct vm_area_struct * vma, unsigned long start, unsigned long end)
+{
+	flush_tlb_mm(vma->vm_mm);
+}
+
+#define TLBSTATE_OK	1
+#define TLBSTATE_LAZY	2
+
+struct tlb_state
+{
+	struct mm_struct *active_mm;
+	int state;
+	char __cacheline_padding[L1_CACHE_BYTES-8];
+};
+DECLARE_PER_CPU(struct tlb_state, cpu_tlbstate);
+
+
+#endif
+
+#define flush_tlb_kernel_range(start, end) flush_tlb_all()
+
+static inline void flush_tlb_pgtables(struct mm_struct *mm,
+				      unsigned long start, unsigned long end)
+{
+	/* i386 does not keep any page table caches in TLB */
+}
+
+#endif /* _I386_TLBFLUSH_H */