1 files changed, 95 insertions, 0 deletions
diff --git a/arch/sh/mm/tlb-sh3.c b/arch/sh/mm/tlb-sh3.c
new file mode 100644
index 0000000000..fb400afc2a
--- /dev/null
+++ b/arch/sh/mm/tlb-sh3.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * arch/sh/mm/tlb-sh3.c
+ *
+ * SH-3 specific TLB operations
+ *
+ * Copyright (C) 1999  Niibe Yutaka
+ * Copyright (C) 2002  Paul Mundt
+ */
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/interrupt.h>
+
+#include <asm/io.h>
+#include <linux/uaccess.h>
+#include <asm/mmu_context.h>
+#include <asm/cacheflush.h>
+
+void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
+{
+	unsigned long flags, pteval, vpn;
+
+	/*
+	 * Handle debugger faulting in for debugee.
+	 */
+	if (vma && current->active_mm != vma->vm_mm)
+		return;
+
+	local_irq_save(flags);
+
+	/* Set PTEH register */
+	vpn = (address & MMU_VPN_MASK) | get_asid();
+	__raw_writel(vpn, MMU_PTEH);
+
+	pteval = pte_val(pte);
+
+	/* Set PTEL register */
+	pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
+	/* conveniently, we want all the software flags to be 0 anyway */
+	__raw_writel(pteval, MMU_PTEL);
+
+	/* Load the TLB */
+	asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
+	local_irq_restore(flags);
+}
+
+void local_flush_tlb_one(unsigned long asid, unsigned long page)
+{
+	unsigned long addr, data;
+	int i, ways = MMU_NTLB_WAYS;
+
+	/*
+	 * NOTE: PTEH.ASID should be set to this MM
+	 *       _AND_ we need to write ASID to the array.
+	 *
+	 * It would be simple if we didn't need to set PTEH.ASID...
+	 */
+	addr = MMU_TLB_ADDRESS_ARRAY | (page & 0x1F000);
+	data = (page & 0xfffe0000) | asid; /* VALID bit is off */
+
+	if ((current_cpu_data.flags & CPU_HAS_MMU_PAGE_ASSOC)) {
+		addr |= MMU_PAGE_ASSOC_BIT;
+		ways = 1;	/* we already know the way .. */
+	}
+
+	for (i = 0; i < ways; i++)
+		__raw_writel(data, addr + (i << 8));
+}
+
+void local_flush_tlb_all(void)
+{
+	unsigned long flags, status;
+
+	/*
+	 * Flush all the TLB.
+	 *
+	 * Write to the MMU control register's bit:
+	 *	TF-bit for SH-3, TI-bit for SH-4.
+	 *      It's same position, bit #2.
+	 */
+	local_irq_save(flags);
+	status = __raw_readl(MMUCR);
+	status |= 0x04;
+	__raw_writel(status, MMUCR);
+	ctrl_barrier();
+	local_irq_restore(flags);
+}