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-rw-r--r--arch/csky/mm/tlb.c198
1 files changed, 198 insertions, 0 deletions
diff --git a/arch/csky/mm/tlb.c b/arch/csky/mm/tlb.c
new file mode 100644
index 000000000..9234c5e5c
--- /dev/null
+++ b/arch/csky/mm/tlb.c
@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+
+#include <asm/mmu_context.h>
+#include <asm/setup.h>
+
+/*
+ * One C-SKY MMU TLB entry contain two PFN/page entry, ie:
+ * 1VPN -> 2PFN
+ */
+#define TLB_ENTRY_SIZE (PAGE_SIZE * 2)
+#define TLB_ENTRY_SIZE_MASK (PAGE_MASK << 1)
+
+void flush_tlb_all(void)
+{
+ tlb_invalid_all();
+}
+
+void flush_tlb_mm(struct mm_struct *mm)
+{
+#ifdef CONFIG_CPU_HAS_TLBI
+ sync_is();
+ asm volatile(
+ "tlbi.asids %0 \n"
+ "sync.i \n"
+ :
+ : "r" (cpu_asid(mm))
+ : "memory");
+#else
+ tlb_invalid_all();
+#endif
+}
+
+/*
+ * MMU operation regs only could invalid tlb entry in jtlb and we
+ * need change asid field to invalid I-utlb & D-utlb.
+ */
+#ifndef CONFIG_CPU_HAS_TLBI
+#define restore_asid_inv_utlb(oldpid, newpid) \
+do { \
+ if (oldpid == newpid) \
+ write_mmu_entryhi(oldpid + 1); \
+ write_mmu_entryhi(oldpid); \
+} while (0)
+#endif
+
+void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ unsigned long newpid = cpu_asid(vma->vm_mm);
+
+ start &= TLB_ENTRY_SIZE_MASK;
+ end += TLB_ENTRY_SIZE - 1;
+ end &= TLB_ENTRY_SIZE_MASK;
+
+#ifdef CONFIG_CPU_HAS_TLBI
+ sync_is();
+ while (start < end) {
+ asm volatile(
+ "tlbi.vas %0 \n"
+ :
+ : "r" (start | newpid)
+ : "memory");
+
+ start += 2*PAGE_SIZE;
+ }
+ asm volatile("sync.i\n");
+#else
+ {
+ unsigned long flags, oldpid;
+
+ local_irq_save(flags);
+ oldpid = read_mmu_entryhi() & ASID_MASK;
+ while (start < end) {
+ int idx;
+
+ write_mmu_entryhi(start | newpid);
+ start += 2*PAGE_SIZE;
+ tlb_probe();
+ idx = read_mmu_index();
+ if (idx >= 0)
+ tlb_invalid_indexed();
+ }
+ restore_asid_inv_utlb(oldpid, newpid);
+ local_irq_restore(flags);
+ }
+#endif
+}
+
+void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+ start &= TLB_ENTRY_SIZE_MASK;
+ end += TLB_ENTRY_SIZE - 1;
+ end &= TLB_ENTRY_SIZE_MASK;
+
+#ifdef CONFIG_CPU_HAS_TLBI
+ sync_is();
+ while (start < end) {
+ asm volatile(
+ "tlbi.vaas %0 \n"
+ :
+ : "r" (start)
+ : "memory");
+
+ start += 2*PAGE_SIZE;
+ }
+ asm volatile("sync.i\n");
+#else
+ {
+ unsigned long flags, oldpid;
+
+ local_irq_save(flags);
+ oldpid = read_mmu_entryhi() & ASID_MASK;
+ while (start < end) {
+ int idx;
+
+ write_mmu_entryhi(start | oldpid);
+ start += 2*PAGE_SIZE;
+ tlb_probe();
+ idx = read_mmu_index();
+ if (idx >= 0)
+ tlb_invalid_indexed();
+ }
+ restore_asid_inv_utlb(oldpid, oldpid);
+ local_irq_restore(flags);
+ }
+#endif
+}
+
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
+{
+ int newpid = cpu_asid(vma->vm_mm);
+
+ addr &= TLB_ENTRY_SIZE_MASK;
+
+#ifdef CONFIG_CPU_HAS_TLBI
+ sync_is();
+ asm volatile(
+ "tlbi.vas %0 \n"
+ "sync.i \n"
+ :
+ : "r" (addr | newpid)
+ : "memory");
+#else
+ {
+ int oldpid, idx;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ oldpid = read_mmu_entryhi() & ASID_MASK;
+ write_mmu_entryhi(addr | newpid);
+ tlb_probe();
+ idx = read_mmu_index();
+ if (idx >= 0)
+ tlb_invalid_indexed();
+
+ restore_asid_inv_utlb(oldpid, newpid);
+ local_irq_restore(flags);
+ }
+#endif
+}
+
+void flush_tlb_one(unsigned long addr)
+{
+ addr &= TLB_ENTRY_SIZE_MASK;
+
+#ifdef CONFIG_CPU_HAS_TLBI
+ sync_is();
+ asm volatile(
+ "tlbi.vaas %0 \n"
+ "sync.i \n"
+ :
+ : "r" (addr)
+ : "memory");
+#else
+ {
+ int oldpid, idx;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ oldpid = read_mmu_entryhi() & ASID_MASK;
+ write_mmu_entryhi(addr | oldpid);
+ tlb_probe();
+ idx = read_mmu_index();
+ if (idx >= 0)
+ tlb_invalid_indexed();
+
+ restore_asid_inv_utlb(oldpid, oldpid);
+ local_irq_restore(flags);
+ }
+#endif
+}
+EXPORT_SYMBOL(flush_tlb_one);