/*
* Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
* Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org)
* Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/init.h>
#include <asm/mmu_context.h>
#include <asm/bootinfo.h>
#include <asm/cpu.h>
extern void build_tlb_refill_handler(void);
#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
/* Dump the current entry* and pagemask registers */
static inline void dump_cur_tlb_regs(void)
{
unsigned int entryhihi, entryhilo, entrylo0hi, entrylo0lo, entrylo1hi;
unsigned int entrylo1lo, pagemask;
__asm__ __volatile__ (
".set push \n"
".set noreorder \n"
".set mips64 \n"
".set noat \n"
" tlbr \n"
" dmfc0 $1, $10 \n"
" dsrl32 %0, $1, 0 \n"
" sll %1, $1, 0 \n"
" dmfc0 $1, $2 \n"
" dsrl32 %2, $1, 0 \n"
" sll %3, $1, 0 \n"
" dmfc0 $1, $3 \n"
" dsrl32 %4, $1, 0 \n"
" sll %5, $1, 0 \n"
" mfc0 %6, $5 \n"
".set pop \n"
: "=r" (entryhihi), "=r" (entryhilo),
"=r" (entrylo0hi), "=r" (entrylo0lo),
"=r" (entrylo1hi), "=r" (entrylo1lo),
"=r" (pagemask));
printk("%08X%08X %08X%08X %08X%08X %08X",
entryhihi, entryhilo,
entrylo0hi, entrylo0lo,
entrylo1hi, entrylo1lo,
pagemask);
}
void sb1_dump_tlb(void)
{
unsigned long old_ctx;
unsigned long flags;
int entry;
local_irq_save(flags);
old_ctx = read_c0_entryhi();
printk("Current TLB registers state:\n"
" EntryHi EntryLo0 EntryLo1 PageMask Index\n"
"--------------------------------------------------------------------\n");
dump_cur_tlb_regs();
printk(" %08X\n", read_c0_index());
printk("\n\nFull TLB Dump:\n"
"Idx EntryHi EntryLo0 EntryLo1 PageMask\n"
"--------------------------------------------------------------\n");
for (entry = 0; entry < current_cpu_data.tlbsize; entry++) {
write_c0_index(entry);
printk("\n%02i ", entry);
dump_cur_tlb_regs();
}
printk("\n");
write_c0_entryhi(old_ctx);
local_irq_restore(flags);
}
void local_flush_tlb_all(void)
{
unsigned long flags;
unsigned long old_ctx;
int entry;
local_irq_save(flags);
/* Save old context and create impossible VPN2 value */
old_ctx = read_c0_entryhi() & ASID_MASK;
write_c0_entrylo0(0);
write_c0_entrylo1(0);
entry = read_c0_wired();
while (entry < current_cpu_data.tlbsize) {
write_c0_entryhi(UNIQUE_ENTRYHI(entry));
write_c0_index(entry);
tlb_write_indexed();
entry++;
}
write_c0_entryhi(old_ctx);
local_irq_restore(flags);
}
/*
* Use a bogus region of memory (starting at 0) to sanitize the TLB's.
* Use increments of the maximum page size (16MB), and check for duplicate
* entries before doing a given write. Then, when we're safe from collisions
* with the firmware, go back and give all the entries invalid addresses with
* the normal flush routine. Wired entries will be killed as well!
*/
static void __init sb1_sanitize_tlb(void)
{
int entry;
long addr = 0;
long inc = 1<<24; /* 16MB */
/* Save old context and create impossible VPN2 value */
write_c0_entrylo0(0);
write_c0_entrylo1(0);
for (entry = 0; entry < current_cpu_data.tlbsize; entry++) {
do {
addr += inc;
write_c0_entryhi(addr);
tlb_probe();
} while ((int)(read_c0_index()) >= 0);
write_c0_index(entry);
tlb_write_indexed();
}
/* Now that we know we're safe from collisions, we can safely flush
the TLB with the "normal" routine. */
local_flush_tlb_all();
}
void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
struct mm_struct *mm = vma->vm_mm;
unsigned long flags;
int cpu;
local_irq_save(flags);
cpu = smp_processor_id();
if (cpu_context(cpu, mm) != 0) {
int size;
size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
size = (size + 1) >> 1;
if (size <= (current_cpu_data.tlbsize/2)) {
int oldpid = read_c0_entryhi() & ASID_MASK;
int newpid = cpu_asid(cpu, mm);
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(UNIQUE_ENTRYHI(idx));
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 <= (current_cpu_data.tlbsize/2)) {
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(UNIQUE_ENTRYHI(idx));
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)
{
unsigned long flags;
int cpu = smp_processor_id();
local_irq_save(flags);
if (cpu_context(cpu, vma->vm_mm) != 0) {
int oldpid, newpid, idx;
newpid = cpu_asid(cpu, vma->vm_mm);
page &= (PAGE_MASK << 1);
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);
if (idx < 0)
goto finish;
/* Make sure all entries differ. */
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
tlb_write_indexed();
finish:
write_c0_entryhi(oldpid);
}
local_irq_restore(flags);
}
/*
* Remove one kernel space TLB entry. This entry is assumed to be marked
* global so we don't do the ASID thing.
*/
void local_flush_tlb_one(unsigned long page)
{
unsigned long flags;
int oldpid, idx;
page &= (PAGE_MASK << 1);
oldpid = read_c0_entryhi() & ASID_MASK;
local_irq_save(flags);
write_c0_entryhi(page);
tlb_probe();
idx = read_c0_index();
if (idx >= 0) {
/* Make sure all entries differ. */
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
write_c0_entrylo0(0);
write_c0_entrylo1(0);
tlb_write_indexed();
}
write_c0_entryhi(oldpid);
local_irq_restore(flags);
}
/* All entries common to a mm share an asid. To effectively flush
these entries, we just bump the asid. */
void local_flush_tlb_mm(struct mm_struct *mm)
{
int cpu;
preempt_disable();
cpu = smp_processor_id();
if (cpu_context(cpu, mm) != 0) {
drop_mmu_context(mm, cpu);
}
preempt_enable();
}
/* Stolen from mips32 routines */
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;
local_irq_save(flags);
pid = read_c0_entryhi() & ASID_MASK;
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);
if (idx < 0) {
tlb_write_random();
} else {
tlb_write_indexed();
}
local_irq_restore(flags);
}
void __init add_wired_entry(unsigned long entrylo0, unsigned long entrylo1,
unsigned long entryhi, unsigned long pagemask)
{
unsigned long flags;
unsigned long wired;
unsigned long old_pagemask;
unsigned long old_ctx;
local_irq_save(flags);
old_ctx = read_c0_entryhi() & 0xff;
old_pagemask = read_c0_pagemask();
wired = read_c0_wired();
write_c0_wired(wired + 1);
write_c0_index(wired);
write_c0_pagemask(pagemask);
write_c0_entryhi(entryhi);
write_c0_entrylo0(entrylo0);
write_c0_entrylo1(entrylo1);
tlb_write_indexed();
write_c0_entryhi(old_ctx);
write_c0_pagemask(old_pagemask);
local_flush_tlb_all();
local_irq_restore(flags);
}
/*
* This is called from loadmmu.c. We have to set up all the
* memory management function pointers, as well as initialize
* the caches and tlbs
*/
void tlb_init(void)
{
write_c0_pagemask(PM_DEFAULT_MASK);
write_c0_wired(0);
/*
* We don't know what state the firmware left the TLB's in, so this is
* the ultra-conservative way to flush the TLB's and avoid machine
* check exceptions due to duplicate TLB entries
*/
sb1_sanitize_tlb();
build_tlb_refill_handler();
}
