Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 279 insertions, 0 deletions

diff --git a/arch/m68k/include/asm/tlbflush.h b/arch/m68k/include/asm/tlbflush.h
new file mode 100644
index 000000000..191e75a6b
--- /dev/null
+++ b/arch/m68k/include/asm/tlbflush.h
@@ -0,0 +1,279 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _M68K_TLBFLUSH_H
+#define _M68K_TLBFLUSH_H
+
+#ifdef CONFIG_MMU
+#ifndef CONFIG_SUN3
+
+#include <asm/current.h>
+#include <asm/mcfmmu.h>
+
+static inline void flush_tlb_kernel_page(void *addr)
+{
+	if (CPU_IS_COLDFIRE) {
+		mmu_write(MMUOR, MMUOR_CNL);
+	} else if (CPU_IS_040_OR_060) {
+		mm_segment_t old_fs = get_fs();
+		set_fs(KERNEL_DS);
+		__asm__ __volatile__(".chip 68040\n\t"
+				     "pflush (%0)\n\t"
+				     ".chip 68k"
+				     : : "a" (addr));
+		set_fs(old_fs);
+	} else if (CPU_IS_020_OR_030)
+		__asm__ __volatile__("pflush #4,#4,(%0)" : : "a" (addr));
+}
+
+/*
+ * flush all user-space atc entries.
+ */
+static inline void __flush_tlb(void)
+{
+	if (CPU_IS_COLDFIRE) {
+		mmu_write(MMUOR, MMUOR_CNL);
+	} else if (CPU_IS_040_OR_060) {
+		__asm__ __volatile__(".chip 68040\n\t"
+				     "pflushan\n\t"
+				     ".chip 68k");
+	} else if (CPU_IS_020_OR_030) {
+		__asm__ __volatile__("pflush #0,#4");
+	}
+}
+
+static inline void __flush_tlb040_one(unsigned long addr)
+{
+	__asm__ __volatile__(".chip 68040\n\t"
+			     "pflush (%0)\n\t"
+			     ".chip 68k"
+			     : : "a" (addr));
+}
+
+static inline void __flush_tlb_one(unsigned long addr)
+{
+	if (CPU_IS_COLDFIRE)
+		mmu_write(MMUOR, MMUOR_CNL);
+	else if (CPU_IS_040_OR_060)
+		__flush_tlb040_one(addr);
+	else if (CPU_IS_020_OR_030)
+		__asm__ __volatile__("pflush #0,#4,(%0)" : : "a" (addr));
+}
+
+#define flush_tlb() __flush_tlb()
+
+/*
+ * flush all atc entries (both kernel and user-space entries).
+ */
+static inline void flush_tlb_all(void)
+{
+	if (CPU_IS_COLDFIRE) {
+		mmu_write(MMUOR, MMUOR_CNL);
+	} else if (CPU_IS_040_OR_060) {
+		__asm__ __volatile__(".chip 68040\n\t"
+				     "pflusha\n\t"
+				     ".chip 68k");
+	} else if (CPU_IS_020_OR_030) {
+		__asm__ __volatile__("pflusha");
+	}
+}
+
+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) {
+		mm_segment_t old_fs = get_fs();
+		set_fs(USER_DS);
+		__flush_tlb_one(addr);
+		set_fs(old_fs);
+	}
+}
+
+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();
+}
+
+static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+	flush_tlb_all();
+}
+
+#else
+
+
+/* Reserved PMEGs. */
+extern char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
+extern unsigned long pmeg_vaddr[SUN3_PMEGS_NUM];
+extern unsigned char pmeg_alloc[SUN3_PMEGS_NUM];
+extern unsigned char pmeg_ctx[SUN3_PMEGS_NUM];
+
+/* Flush all userspace mappings one by one...  (why no flush command,
+   sun?) */
+static inline void flush_tlb_all(void)
+{
+       unsigned long addr;
+       unsigned char ctx, oldctx;
+
+       oldctx = sun3_get_context();
+       for(addr = 0x00000000; addr < TASK_SIZE; addr += SUN3_PMEG_SIZE) {
+	       for(ctx = 0; ctx < 8; ctx++) {
+		       sun3_put_context(ctx);
+		       sun3_put_segmap(addr, SUN3_INVALID_PMEG);
+	       }
+       }
+
+       sun3_put_context(oldctx);
+       /* erase all of the userspace pmeg maps, we've clobbered them
+	  all anyway */
+       for(addr = 0; addr < SUN3_INVALID_PMEG; addr++) {
+	       if(pmeg_alloc[addr] == 1) {
+		       pmeg_alloc[addr] = 0;
+		       pmeg_ctx[addr] = 0;
+		       pmeg_vaddr[addr] = 0;
+	       }
+       }
+
+}
+
+/* Clear user TLB entries within the context named in mm */
+static inline void flush_tlb_mm (struct mm_struct *mm)
+{
+     unsigned char oldctx;
+     unsigned char seg;
+     unsigned long i;
+
+     oldctx = sun3_get_context();
+     sun3_put_context(mm->context);
+
+     for(i = 0; i < TASK_SIZE; i += SUN3_PMEG_SIZE) {
+	     seg = sun3_get_segmap(i);
+	     if(seg == SUN3_INVALID_PMEG)
+		     continue;
+
+	     sun3_put_segmap(i, SUN3_INVALID_PMEG);
+	     pmeg_alloc[seg] = 0;
+	     pmeg_ctx[seg] = 0;
+	     pmeg_vaddr[seg] = 0;
+     }
+
+     sun3_put_context(oldctx);
+
+}
+
+/* Flush a single TLB page. In this case, we're limited to flushing a
+   single PMEG */
+static inline void flush_tlb_page (struct vm_area_struct *vma,
+				   unsigned long addr)
+{
+	unsigned char oldctx;
+	unsigned char i;
+
+	oldctx = sun3_get_context();
+	sun3_put_context(vma->vm_mm->context);
+	addr &= ~SUN3_PMEG_MASK;
+	if((i = sun3_get_segmap(addr)) != SUN3_INVALID_PMEG)
+	{
+		pmeg_alloc[i] = 0;
+		pmeg_ctx[i] = 0;
+		pmeg_vaddr[i] = 0;
+		sun3_put_segmap (addr,  SUN3_INVALID_PMEG);
+	}
+	sun3_put_context(oldctx);
+
+}
+/* Flush a range of pages from TLB. */
+
+static inline void flush_tlb_range (struct vm_area_struct *vma,
+		      unsigned long start, unsigned long end)
+{
+	struct mm_struct *mm = vma->vm_mm;
+	unsigned char seg, oldctx;
+
+	start &= ~SUN3_PMEG_MASK;
+
+	oldctx = sun3_get_context();
+	sun3_put_context(mm->context);
+
+	while(start < end)
+	{
+		if((seg = sun3_get_segmap(start)) == SUN3_INVALID_PMEG)
+		     goto next;
+		if(pmeg_ctx[seg] == mm->context) {
+			pmeg_alloc[seg] = 0;
+			pmeg_ctx[seg] = 0;
+			pmeg_vaddr[seg] = 0;
+		}
+		sun3_put_segmap(start, SUN3_INVALID_PMEG);
+	next:
+		start += SUN3_PMEG_SIZE;
+	}
+}
+
+static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+	flush_tlb_all();
+}
+
+/* Flush kernel page from TLB. */
+static inline void flush_tlb_kernel_page (unsigned long addr)
+{
+	sun3_put_segmap (addr & ~(SUN3_PMEG_SIZE - 1), SUN3_INVALID_PMEG);
+}
+
+#endif
+
+#else /* !CONFIG_MMU */
+
+/*
+ * flush all user-space atc entries.
+ */
+static inline void __flush_tlb(void)
+{
+	BUG();
+}
+
+static inline void __flush_tlb_one(unsigned long addr)
+{
+	BUG();
+}
+
+#define flush_tlb() __flush_tlb()
+
+/*
+ * flush all atc entries (both kernel and user-space entries).
+ */
+static inline void flush_tlb_all(void)
+{
+	BUG();
+}
+
+static inline void flush_tlb_mm(struct mm_struct *mm)
+{
+	BUG();
+}
+
+static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
+{
+	BUG();
+}
+
+static inline void flush_tlb_range(struct mm_struct *mm,
+				   unsigned long start, unsigned long end)
+{
+	BUG();
+}
+
+static inline void flush_tlb_kernel_page(unsigned long addr)
+{
+	BUG();
+}
+
+#endif /* CONFIG_MMU */
+
+#endif /* _M68K_TLBFLUSH_H */