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-rw-r--r--arch/mips/mm/tlb-andes.c257
1 files changed, 257 insertions, 0 deletions
diff --git a/arch/mips/mm/tlb-andes.c b/arch/mips/mm/tlb-andes.c
new file mode 100644
index 00000000000..167e08e9661
--- /dev/null
+++ b/arch/mips/mm/tlb-andes.c
@@ -0,0 +1,257 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1997, 1998, 1999 Ralf Baechle (ralf@gnu.org)
+ * Copyright (C) 1999 Silicon Graphics, Inc.
+ * Copyright (C) 2000 Kanoj Sarcar (kanoj@sgi.com)
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/mmu_context.h>
+
+extern void build_tlb_refill_handler(void);
+
+#define NTLB_ENTRIES 64
+#define NTLB_ENTRIES_HALF 32
+
+void local_flush_tlb_all(void)
+{
+ unsigned long flags;
+ unsigned long old_ctx;
+ unsigned long entry;
+
+ local_irq_save(flags);
+ /* Save old context and create impossible VPN2 value */
+ old_ctx = read_c0_entryhi() & ASID_MASK;
+ write_c0_entryhi(CKSEG0);
+ write_c0_entrylo0(0);
+ write_c0_entrylo1(0);
+
+ entry = read_c0_wired();
+
+ /* Blast 'em all away. */
+ while (entry < NTLB_ENTRIES) {
+ write_c0_index(entry);
+ tlb_write_indexed();
+ entry++;
+ }
+ write_c0_entryhi(old_ctx);
+ local_irq_restore(flags);
+}
+
+void local_flush_tlb_mm(struct mm_struct *mm)
+{
+ int cpu = smp_processor_id();
+ if (cpu_context(cpu, mm) != 0) {
+ drop_mmu_context(mm,cpu);
+ }
+}
+
+void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ struct mm_struct *mm = vma->vm_mm;
+ int cpu = smp_processor_id();
+
+ if (cpu_context(cpu, mm) != 0) {
+ unsigned long flags;
+ int size;
+
+ local_irq_save(flags);
+ size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
+ size = (size + 1) >> 1;
+ if (size <= NTLB_ENTRIES_HALF) {
+ int oldpid = (read_c0_entryhi() & ASID_MASK);
+ int newpid = (cpu_context(smp_processor_id(), mm)
+ & ASID_MASK);
+
+ start &= (PAGE_MASK << 1);
+ end += ((PAGE_SIZE << 1) - 1);
+ end &= (PAGE_MASK << 1);
+ while(start < end) {
+ int idx;
+
+ write_c0_entryhi(start | newpid);
+ start += (PAGE_SIZE << 1);
+ tlb_probe();
+ idx = read_c0_index();
+ write_c0_entrylo0(0);
+ write_c0_entrylo1(0);
+ write_c0_entryhi(CKSEG0);
+ if(idx < 0)
+ continue;
+ tlb_write_indexed();
+ }
+ write_c0_entryhi(oldpid);
+ } else {
+ drop_mmu_context(mm, cpu);
+ }
+ local_irq_restore(flags);
+ }
+}
+
+void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+ unsigned long flags;
+ int size;
+
+ size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
+ size = (size + 1) >> 1;
+
+ local_irq_save(flags);
+ if (size <= NTLB_ENTRIES_HALF) {
+ int pid = read_c0_entryhi();
+
+ start &= (PAGE_MASK << 1);
+ end += ((PAGE_SIZE << 1) - 1);
+ end &= (PAGE_MASK << 1);
+
+ while (start < end) {
+ int idx;
+
+ write_c0_entryhi(start);
+ start += (PAGE_SIZE << 1);
+ tlb_probe();
+ idx = read_c0_index();
+ write_c0_entrylo0(0);
+ write_c0_entrylo1(0);
+ write_c0_entryhi(CKSEG0 + (idx << (PAGE_SHIFT+1)));
+ if (idx < 0)
+ continue;
+ tlb_write_indexed();
+ }
+ write_c0_entryhi(pid);
+ } else {
+ local_flush_tlb_all();
+ }
+ local_irq_restore(flags);
+}
+
+void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
+{
+ if (cpu_context(smp_processor_id(), vma->vm_mm) != 0) {
+ unsigned long flags;
+ int oldpid, newpid, idx;
+
+ newpid = (cpu_context(smp_processor_id(), vma->vm_mm) &
+ ASID_MASK);
+ page &= (PAGE_MASK << 1);
+ local_irq_save(flags);
+ oldpid = (read_c0_entryhi() & ASID_MASK);
+ write_c0_entryhi(page | newpid);
+ tlb_probe();
+ idx = read_c0_index();
+ write_c0_entrylo0(0);
+ write_c0_entrylo1(0);
+ write_c0_entryhi(CKSEG0);
+ if (idx < 0)
+ goto finish;
+ tlb_write_indexed();
+
+ finish:
+ write_c0_entryhi(oldpid);
+ local_irq_restore(flags);
+ }
+}
+
+/*
+ * This one is only used for pages with the global bit set so we don't care
+ * much about the ASID.
+ */
+void local_flush_tlb_one(unsigned long page)
+{
+ unsigned long flags;
+ int oldpid, idx;
+
+ local_irq_save(flags);
+ page &= (PAGE_MASK << 1);
+ oldpid = read_c0_entryhi() & 0xff;
+ write_c0_entryhi(page);
+ tlb_probe();
+ idx = read_c0_index();
+ write_c0_entrylo0(0);
+ write_c0_entrylo1(0);
+ if (idx >= 0) {
+ /* Make sure all entries differ. */
+ write_c0_entryhi(CKSEG0+(idx<<(PAGE_SHIFT+1)));
+ tlb_write_indexed();
+ }
+ write_c0_entryhi(oldpid);
+
+ local_irq_restore(flags);
+}
+
+/* XXX Simplify this. On the R10000 writing a TLB entry for an virtual
+ address that already exists will overwrite the old entry and not result
+ in TLB malfunction or TLB shutdown. */
+void __update_tlb(struct vm_area_struct * vma, unsigned long address, pte_t pte)
+{
+ unsigned long flags;
+ pgd_t *pgdp;
+ pmd_t *pmdp;
+ pte_t *ptep;
+ int idx, pid;
+
+ /*
+ * Handle debugger faulting in for debugee.
+ */
+ if (current->active_mm != vma->vm_mm)
+ return;
+
+ pid = read_c0_entryhi() & ASID_MASK;
+
+ if ((pid != (cpu_context(smp_processor_id(), vma->vm_mm) & ASID_MASK))
+ || (cpu_context(smp_processor_id(), vma->vm_mm) == 0)) {
+ printk(KERN_WARNING
+ "%s: Wheee, bogus tlbpid mmpid=%d tlbpid=%d\n",
+ __FUNCTION__, (int) (cpu_context(smp_processor_id(),
+ vma->vm_mm) & ASID_MASK), pid);
+ }
+
+ local_irq_save(flags);
+ address &= (PAGE_MASK << 1);
+ write_c0_entryhi(address | (pid));
+ pgdp = pgd_offset(vma->vm_mm, address);
+ tlb_probe();
+ pmdp = pmd_offset(pgdp, address);
+ idx = read_c0_index();
+ ptep = pte_offset_map(pmdp, address);
+ write_c0_entrylo0(pte_val(*ptep++) >> 6);
+ write_c0_entrylo1(pte_val(*ptep) >> 6);
+ write_c0_entryhi(address | pid);
+ if (idx < 0) {
+ tlb_write_random();
+ } else {
+ tlb_write_indexed();
+ }
+ write_c0_entryhi(pid);
+ local_irq_restore(flags);
+}
+
+void __init tlb_init(void)
+{
+ /*
+ * You should never change this register:
+ * - On R4600 1.7 the tlbp never hits for pages smaller than
+ * the value in the c0_pagemask register.
+ * - The entire mm handling assumes the c0_pagemask register to
+ * be set for 4kb pages.
+ */
+ write_c0_pagemask(PM_4K);
+ write_c0_wired(0);
+ write_c0_framemask(0);
+
+ /* From this point on the ARC firmware is dead. */
+ local_flush_tlb_all();
+
+ /* Did I tell you that ARC SUCKS? */
+
+ build_tlb_refill_handler();
+}
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