Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/include/asm-s390/tlbflush.h b/include/asm-s390/tlbflush.h
new file mode 100644
index 0000000..1bb73b0
--- /dev/null
+++ b/include/asm-s390/tlbflush.h
@@ -0,0 +1,153 @@
+#ifndef _S390_TLBFLUSH_H
+#define _S390_TLBFLUSH_H
+
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <asm/processor.h>
+
+/*
+ * 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
+ */
+
+/*
+ * S/390 has three ways of flushing TLBs
+ * 'ptlb' does a flush of the local processor
+ * 'csp' flushes the TLBs on all PUs of a SMP
+ * 'ipte' invalidates a pte in a page table and flushes that out of
+ * the TLBs of all PUs of a SMP
+ */
+
+#define local_flush_tlb() \
+do { __asm__ __volatile__("ptlb": : :"memory"); } while (0)
+
+#ifndef CONFIG_SMP
+
+/*
+ * We always need to flush, since s390 does not flush tlb
+ * on each context switch
+ */
+
+static inline void flush_tlb(void)
+{
+ local_flush_tlb();
+}
+static inline void flush_tlb_all(void)
+{
+ local_flush_tlb();
+}
+static inline void flush_tlb_mm(struct mm_struct *mm)
+{
+ local_flush_tlb();
+}
+static inline void flush_tlb_page(struct vm_area_struct *vma,
+ unsigned long addr)
+{
+ local_flush_tlb();
+}
+static inline void flush_tlb_range(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end)
+{
+ local_flush_tlb();
+}
+
+#define flush_tlb_kernel_range(start, end) \
+ local_flush_tlb();
+
+#else
+
+#include <asm/smp.h>
+
+extern void smp_ptlb_all(void);
+
+static inline void global_flush_tlb(void)
+{
+#ifndef __s390x__
+ if (!MACHINE_HAS_CSP) {
+ smp_ptlb_all();
+ return;
+ }
+#endif /* __s390x__ */
+ {
+ register unsigned long addr asm("4");
+ long dummy;
+
+ dummy = 0;
+ addr = ((unsigned long) &dummy) + 1;
+ __asm__ __volatile__ (
+ " slr 2,2\n"
+ " slr 3,3\n"
+ " csp 2,%0"
+ : : "a" (addr), "m" (dummy) : "cc", "2", "3" );
+ }
+}
+
+/*
+ * We only have to do global flush of tlb if process run since last
+ * flush on any other pu than current.
+ * If we have threads (mm->count > 1) we always do a global flush,
+ * since the process runs on more than one processor at the same time.
+ */
+
+static inline void __flush_tlb_mm(struct mm_struct * mm)
+{
+ cpumask_t local_cpumask;
+
+ if (unlikely(cpus_empty(mm->cpu_vm_mask)))
+ return;
+ if (MACHINE_HAS_IDTE) {
+ asm volatile (".insn rrf,0xb98e0000,0,%0,%1,0"
+ : : "a" (2048),
+ "a" (__pa(mm->pgd)&PAGE_MASK) : "cc" );
+ return;
+ }
+ preempt_disable();
+ local_cpumask = cpumask_of_cpu(smp_processor_id());
+ if (cpus_equal(mm->cpu_vm_mask, local_cpumask))
+ local_flush_tlb();
+ else
+ global_flush_tlb();
+ preempt_enable();
+}
+
+static inline void flush_tlb(void)
+{
+ __flush_tlb_mm(current->mm);
+}
+static inline void flush_tlb_all(void)
+{
+ global_flush_tlb();
+}
+static inline void flush_tlb_mm(struct mm_struct *mm)
+{
+ __flush_tlb_mm(mm);
+}
+static inline void flush_tlb_page(struct vm_area_struct *vma,
+ unsigned long addr)
+{
+ __flush_tlb_mm(vma->vm_mm);
+}
+static inline void flush_tlb_range(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end)
+{
+ __flush_tlb_mm(vma->vm_mm);
+}
+
+#define flush_tlb_kernel_range(start, end) global_flush_tlb()
+
+#endif
+
+static inline void flush_tlb_pgtables(struct mm_struct *mm,
+ unsigned long start, unsigned long end)
+{
+ /* S/390 does not keep any page table caches in TLB */
+}
+
+#endif /* _S390_TLBFLUSH_H */