summaryrefslogtreecommitdiff
path: root/arch/sh/mm/tlb-sh5.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sh/mm/tlb-sh5.c')
-rw-r--r--arch/sh/mm/tlb-sh5.c224
1 files changed, 0 insertions, 224 deletions
diff --git a/arch/sh/mm/tlb-sh5.c b/arch/sh/mm/tlb-sh5.c
deleted file mode 100644
index e4bb2a8e0a69..000000000000
--- a/arch/sh/mm/tlb-sh5.c
+++ /dev/null
@@ -1,224 +0,0 @@
-/*
- * arch/sh/mm/tlb-sh5.c
- *
- * Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org>
- * Copyright (C) 2003 Richard Curnow <richard.curnow@superh.com>
- *
- * 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.
- */
-#include <linux/mm.h>
-#include <linux/init.h>
-#include <asm/page.h>
-#include <asm/tlb.h>
-#include <asm/mmu_context.h>
-
-/**
- * sh64_tlb_init - Perform initial setup for the DTLB and ITLB.
- */
-int sh64_tlb_init(void)
-{
- /* Assign some sane DTLB defaults */
- cpu_data->dtlb.entries = 64;
- cpu_data->dtlb.step = 0x10;
-
- cpu_data->dtlb.first = DTLB_FIXED | cpu_data->dtlb.step;
- cpu_data->dtlb.next = cpu_data->dtlb.first;
-
- cpu_data->dtlb.last = DTLB_FIXED |
- ((cpu_data->dtlb.entries - 1) *
- cpu_data->dtlb.step);
-
- /* And again for the ITLB */
- cpu_data->itlb.entries = 64;
- cpu_data->itlb.step = 0x10;
-
- cpu_data->itlb.first = ITLB_FIXED | cpu_data->itlb.step;
- cpu_data->itlb.next = cpu_data->itlb.first;
- cpu_data->itlb.last = ITLB_FIXED |
- ((cpu_data->itlb.entries - 1) *
- cpu_data->itlb.step);
-
- return 0;
-}
-
-/**
- * sh64_next_free_dtlb_entry - Find the next available DTLB entry
- */
-unsigned long long sh64_next_free_dtlb_entry(void)
-{
- return cpu_data->dtlb.next;
-}
-
-/**
- * sh64_get_wired_dtlb_entry - Allocate a wired (locked-in) entry in the DTLB
- */
-unsigned long long sh64_get_wired_dtlb_entry(void)
-{
- unsigned long long entry = sh64_next_free_dtlb_entry();
-
- cpu_data->dtlb.first += cpu_data->dtlb.step;
- cpu_data->dtlb.next += cpu_data->dtlb.step;
-
- return entry;
-}
-
-/**
- * sh64_put_wired_dtlb_entry - Free a wired (locked-in) entry in the DTLB.
- *
- * @entry: Address of TLB slot.
- *
- * Works like a stack, last one to allocate must be first one to free.
- */
-int sh64_put_wired_dtlb_entry(unsigned long long entry)
-{
- __flush_tlb_slot(entry);
-
- /*
- * We don't do any particularly useful tracking of wired entries,
- * so this approach works like a stack .. last one to be allocated
- * has to be the first one to be freed.
- *
- * We could potentially load wired entries into a list and work on
- * rebalancing the list periodically (which also entails moving the
- * contents of a TLB entry) .. though I have a feeling that this is
- * more trouble than it's worth.
- */
-
- /*
- * Entry must be valid .. we don't want any ITLB addresses!
- */
- if (entry <= DTLB_FIXED)
- return -EINVAL;
-
- /*
- * Next, check if we're within range to be freed. (ie, must be the
- * entry beneath the first 'free' entry!
- */
- if (entry < (cpu_data->dtlb.first - cpu_data->dtlb.step))
- return -EINVAL;
-
- /* If we are, then bring this entry back into the list */
- cpu_data->dtlb.first -= cpu_data->dtlb.step;
- cpu_data->dtlb.next = entry;
-
- return 0;
-}
-
-/**
- * sh64_setup_tlb_slot - Load up a translation in a wired slot.
- *
- * @config_addr: Address of TLB slot.
- * @eaddr: Virtual address.
- * @asid: Address Space Identifier.
- * @paddr: Physical address.
- *
- * Load up a virtual<->physical translation for @eaddr<->@paddr in the
- * pre-allocated TLB slot @config_addr (see sh64_get_wired_dtlb_entry).
- */
-void sh64_setup_tlb_slot(unsigned long long config_addr, unsigned long eaddr,
- unsigned long asid, unsigned long paddr)
-{
- unsigned long long pteh, ptel;
-
- pteh = neff_sign_extend(eaddr);
- pteh &= PAGE_MASK;
- pteh |= (asid << PTEH_ASID_SHIFT) | PTEH_VALID;
- ptel = neff_sign_extend(paddr);
- ptel &= PAGE_MASK;
- ptel |= (_PAGE_CACHABLE | _PAGE_READ | _PAGE_WRITE);
-
- asm volatile("putcfg %0, 1, %1\n\t"
- "putcfg %0, 0, %2\n"
- : : "r" (config_addr), "r" (ptel), "r" (pteh));
-}
-
-/**
- * sh64_teardown_tlb_slot - Teardown a translation.
- *
- * @config_addr: Address of TLB slot.
- *
- * Teardown any existing mapping in the TLB slot @config_addr.
- */
-void sh64_teardown_tlb_slot(unsigned long long config_addr)
- __attribute__ ((alias("__flush_tlb_slot")));
-
-static int dtlb_entry;
-static unsigned long long dtlb_entries[64];
-
-void tlb_wire_entry(struct vm_area_struct *vma, unsigned long addr, pte_t pte)
-{
- unsigned long long entry;
- unsigned long paddr, flags;
-
- BUG_ON(dtlb_entry == ARRAY_SIZE(dtlb_entries));
-
- local_irq_save(flags);
-
- entry = sh64_get_wired_dtlb_entry();
- dtlb_entries[dtlb_entry++] = entry;
-
- paddr = pte_val(pte) & _PAGE_FLAGS_HARDWARE_MASK;
- paddr &= ~PAGE_MASK;
-
- sh64_setup_tlb_slot(entry, addr, get_asid(), paddr);
-
- local_irq_restore(flags);
-}
-
-void tlb_unwire_entry(void)
-{
- unsigned long long entry;
- unsigned long flags;
-
- BUG_ON(!dtlb_entry);
-
- local_irq_save(flags);
- entry = dtlb_entries[dtlb_entry--];
-
- sh64_teardown_tlb_slot(entry);
- sh64_put_wired_dtlb_entry(entry);
-
- local_irq_restore(flags);
-}
-
-void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
-{
- unsigned long long ptel;
- unsigned long long pteh=0;
- struct tlb_info *tlbp;
- unsigned long long next;
- unsigned int fault_code = get_thread_fault_code();
-
- /* Get PTEL first */
- ptel = pte.pte_low;
-
- /*
- * Set PTEH register
- */
- pteh = neff_sign_extend(address & MMU_VPN_MASK);
-
- /* Set the ASID. */
- pteh |= get_asid() << PTEH_ASID_SHIFT;
- pteh |= PTEH_VALID;
-
- /* Set PTEL register, set_pte has performed the sign extension */
- ptel &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
-
- if (fault_code & FAULT_CODE_ITLB)
- tlbp = &cpu_data->itlb;
- else
- tlbp = &cpu_data->dtlb;
-
- next = tlbp->next;
- __flush_tlb_slot(next);
- asm volatile ("putcfg %0,1,%2\n\n\t"
- "putcfg %0,0,%1\n"
- : : "r" (next), "r" (pteh), "r" (ptel) );
-
- next += TLB_STEP;
- if (next > tlbp->last)
- next = tlbp->first;
- tlbp->next = next;
-}