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/*
* 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) 1996 David S. Miller (dm@engr.sgi.com)
* Copyright (C) 1997, 1998, 1999, 2000 Ralf Baechle ralf@gnu.org
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 2002 MIPS Technologies, Inc. All rights reserved.
*/
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <asm/cpu.h>
#include <asm/bootinfo.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/system.h>
extern void build_tlb_refill_handler(void);
#define TFP_TLB_SIZE 384
#define TFP_TLB_SET_SHIFT 7
/* CP0 hazard avoidance. */
#define BARRIER __asm__ __volatile__(".set noreorder\n\t" \
"nop; nop; nop; nop; nop; nop;\n\t" \
".set reorder\n\t")
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();
write_c0_entrylo(0);
for (entry = 0; entry < TFP_TLB_SIZE; entry++) {
write_c0_tlbset(entry >> TFP_TLB_SET_SHIFT);
write_c0_vaddr(entry << PAGE_SHIFT);
write_c0_entryhi(CKSEG0 + (entry << (PAGE_SHIFT + 1)));
mtc0_tlbw_hazard();
tlb_write();
}
tlbw_use_hazard();
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();
unsigned long flags;
int oldpid, newpid, size;
if (!cpu_context(cpu, mm))
return;
size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
size = (size + 1) >> 1;
local_irq_save(flags);
if (size > TFP_TLB_SIZE / 2) {
drop_mmu_context(mm, cpu);
goto out_restore;
}
oldpid = read_c0_entryhi();
newpid = cpu_asid(cpu, mm);
write_c0_entrylo(0);
start &= PAGE_MASK;
end += (PAGE_SIZE - 1);
end &= PAGE_MASK;
while (start < end) {
signed long idx;
write_c0_vaddr(start);
write_c0_entryhi(start);
start += PAGE_SIZE;
tlb_probe();
idx = read_c0_tlbset();
if (idx < 0)
continue;
write_c0_entryhi(CKSEG0 + (idx << (PAGE_SHIFT + 1)));
tlb_write();
}
write_c0_entryhi(oldpid);
out_restore:
local_irq_restore(flags);
}
/* Usable for KV1 addresses only! */
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;
if (size > TFP_TLB_SIZE / 2) {
local_flush_tlb_all();
return;
}
local_irq_save(flags);
write_c0_entrylo(0);
start &= PAGE_MASK;
end += (PAGE_SIZE - 1);
end &= PAGE_MASK;
while (start < end) {
signed long idx;
write_c0_vaddr(start);
write_c0_entryhi(start);
start += PAGE_SIZE;
tlb_probe();
idx = read_c0_tlbset();
if (idx < 0)
continue;
write_c0_entryhi(CKSEG0 + (idx << (PAGE_SHIFT + 1)));
tlb_write();
}
local_irq_restore(flags);
}
void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
{
int cpu = smp_processor_id();
unsigned long flags;
int oldpid, newpid;
signed long idx;
if (!cpu_context(cpu, vma->vm_mm))
return;
newpid = cpu_asid(cpu, vma->vm_mm);
page &= PAGE_MASK;
local_irq_save(flags);
oldpid = read_c0_entryhi();
write_c0_vaddr(page);
write_c0_entryhi(newpid);
tlb_probe();
idx = read_c0_tlbset();
if (idx < 0)
goto finish;
write_c0_entrylo(0);
write_c0_entryhi(CKSEG0 + (idx << (PAGE_SHIFT + 1)));
tlb_write();
finish:
write_c0_entryhi(oldpid);
local_irq_restore(flags);
}
/*
* We will need multiple versions of update_mmu_cache(), one that just
* updates the TLB with the new pte(s), and another which also checks
* for the R4k "end of page" hardware bug and does the needy.
*/
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 pid;
/*
* Handle debugger faulting in for debugee.
*/
if (current->active_mm != vma->vm_mm)
return;
pid = read_c0_entryhi() & ASID_MASK;
local_irq_save(flags);
address &= PAGE_MASK;
write_c0_vaddr(address);
write_c0_entryhi(pid);
pgdp = pgd_offset(vma->vm_mm, address);
pmdp = pmd_offset(pgdp, address);
ptep = pte_offset_map(pmdp, address);
tlb_probe();
write_c0_entrylo(pte_val(*ptep++) >> 6);
tlb_write();
write_c0_entryhi(pid);
local_irq_restore(flags);
}
static void __cpuinit probe_tlb(unsigned long config)
{
struct cpuinfo_mips *c = ¤t_cpu_data;
c->tlbsize = 3 * 128; /* 3 sets each 128 entries */
}
void __cpuinit tlb_init(void)
{
unsigned int config = read_c0_config();
unsigned long status;
probe_tlb(config);
status = read_c0_status();
status &= ~(ST0_UPS | ST0_KPS);
#ifdef CONFIG_PAGE_SIZE_4KB
status |= (TFP_PAGESIZE_4K << 32) | (TFP_PAGESIZE_4K << 36);
#elif defined(CONFIG_PAGE_SIZE_8KB)
status |= (TFP_PAGESIZE_8K << 32) | (TFP_PAGESIZE_8K << 36);
#elif defined(CONFIG_PAGE_SIZE_16KB)
status |= (TFP_PAGESIZE_16K << 32) | (TFP_PAGESIZE_16K << 36);
#elif defined(CONFIG_PAGE_SIZE_64KB)
status |= (TFP_PAGESIZE_64K << 32) | (TFP_PAGESIZE_64K << 36);
#endif
write_c0_status(status);
write_c0_wired(0);
local_flush_tlb_all();
build_tlb_refill_handler();
}
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