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 000000000000..f22fab0cea26
--- /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 */