329 lines
7.2 KiB
C
329 lines
7.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __M68K_MMU_CONTEXT_H
|
|
#define __M68K_MMU_CONTEXT_H
|
|
|
|
#include <asm-generic/mm_hooks.h>
|
|
#include <linux/mm_types.h>
|
|
|
|
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
|
|
{
|
|
}
|
|
|
|
#ifdef CONFIG_MMU
|
|
|
|
#if defined(CONFIG_COLDFIRE)
|
|
|
|
#include <asm/atomic.h>
|
|
#include <asm/bitops.h>
|
|
#include <asm/mcfmmu.h>
|
|
#include <asm/mmu.h>
|
|
|
|
#define NO_CONTEXT 256
|
|
#define LAST_CONTEXT 255
|
|
#define FIRST_CONTEXT 1
|
|
|
|
extern unsigned long context_map[];
|
|
extern mm_context_t next_mmu_context;
|
|
|
|
extern atomic_t nr_free_contexts;
|
|
extern struct mm_struct *context_mm[LAST_CONTEXT+1];
|
|
extern void steal_context(void);
|
|
|
|
static inline void get_mmu_context(struct mm_struct *mm)
|
|
{
|
|
mm_context_t ctx;
|
|
|
|
if (mm->context != NO_CONTEXT)
|
|
return;
|
|
while (atomic_dec_and_test_lt(&nr_free_contexts)) {
|
|
atomic_inc(&nr_free_contexts);
|
|
steal_context();
|
|
}
|
|
ctx = next_mmu_context;
|
|
while (test_and_set_bit(ctx, context_map)) {
|
|
ctx = find_next_zero_bit(context_map, LAST_CONTEXT+1, ctx);
|
|
if (ctx > LAST_CONTEXT)
|
|
ctx = 0;
|
|
}
|
|
next_mmu_context = (ctx + 1) & LAST_CONTEXT;
|
|
mm->context = ctx;
|
|
context_mm[ctx] = mm;
|
|
}
|
|
|
|
/*
|
|
* Set up the context for a new address space.
|
|
*/
|
|
#define init_new_context(tsk, mm) (((mm)->context = NO_CONTEXT), 0)
|
|
|
|
/*
|
|
* We're finished using the context for an address space.
|
|
*/
|
|
static inline void destroy_context(struct mm_struct *mm)
|
|
{
|
|
if (mm->context != NO_CONTEXT) {
|
|
clear_bit(mm->context, context_map);
|
|
mm->context = NO_CONTEXT;
|
|
atomic_inc(&nr_free_contexts);
|
|
}
|
|
}
|
|
|
|
static inline void set_context(mm_context_t context, pgd_t *pgd)
|
|
{
|
|
__asm__ __volatile__ ("movec %0,%%asid" : : "d" (context));
|
|
}
|
|
|
|
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
|
|
struct task_struct *tsk)
|
|
{
|
|
get_mmu_context(tsk->mm);
|
|
set_context(tsk->mm->context, next->pgd);
|
|
}
|
|
|
|
/*
|
|
* After we have set current->mm to a new value, this activates
|
|
* the context for the new mm so we see the new mappings.
|
|
*/
|
|
static inline void activate_mm(struct mm_struct *active_mm,
|
|
struct mm_struct *mm)
|
|
{
|
|
get_mmu_context(mm);
|
|
set_context(mm->context, mm->pgd);
|
|
}
|
|
|
|
#define deactivate_mm(tsk, mm) do { } while (0)
|
|
|
|
#define prepare_arch_switch(next) load_ksp_mmu(next)
|
|
|
|
static inline void load_ksp_mmu(struct task_struct *task)
|
|
{
|
|
unsigned long flags;
|
|
struct mm_struct *mm;
|
|
int asid;
|
|
pgd_t *pgd;
|
|
pmd_t *pmd;
|
|
pte_t *pte;
|
|
unsigned long mmuar;
|
|
|
|
local_irq_save(flags);
|
|
mmuar = task->thread.ksp;
|
|
|
|
/* Search for a valid TLB entry, if one is found, don't remap */
|
|
mmu_write(MMUAR, mmuar);
|
|
mmu_write(MMUOR, MMUOR_STLB | MMUOR_ADR);
|
|
if (mmu_read(MMUSR) & MMUSR_HIT)
|
|
goto end;
|
|
|
|
if (mmuar >= PAGE_OFFSET) {
|
|
mm = &init_mm;
|
|
} else {
|
|
pr_info("load_ksp_mmu: non-kernel mm found: 0x%p\n", task->mm);
|
|
mm = task->mm;
|
|
}
|
|
|
|
if (!mm)
|
|
goto bug;
|
|
|
|
pgd = pgd_offset(mm, mmuar);
|
|
if (pgd_none(*pgd))
|
|
goto bug;
|
|
|
|
pmd = pmd_offset(pgd, mmuar);
|
|
if (pmd_none(*pmd))
|
|
goto bug;
|
|
|
|
pte = (mmuar >= PAGE_OFFSET) ? pte_offset_kernel(pmd, mmuar)
|
|
: pte_offset_map(pmd, mmuar);
|
|
if (pte_none(*pte) || !pte_present(*pte))
|
|
goto bug;
|
|
|
|
set_pte(pte, pte_mkyoung(*pte));
|
|
asid = mm->context & 0xff;
|
|
if (!pte_dirty(*pte) && mmuar <= PAGE_OFFSET)
|
|
set_pte(pte, pte_wrprotect(*pte));
|
|
|
|
mmu_write(MMUTR, (mmuar & PAGE_MASK) | (asid << MMUTR_IDN) |
|
|
(((int)(pte->pte) & (int)CF_PAGE_MMUTR_MASK)
|
|
>> CF_PAGE_MMUTR_SHIFT) | MMUTR_V);
|
|
|
|
mmu_write(MMUDR, (pte_val(*pte) & PAGE_MASK) |
|
|
((pte->pte) & CF_PAGE_MMUDR_MASK) | MMUDR_SZ_8KB | MMUDR_X);
|
|
|
|
mmu_write(MMUOR, MMUOR_ACC | MMUOR_UAA);
|
|
|
|
goto end;
|
|
|
|
bug:
|
|
pr_info("ksp load failed: mm=0x%p ksp=0x08%lx\n", mm, mmuar);
|
|
end:
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
#elif defined(CONFIG_SUN3)
|
|
#include <asm/sun3mmu.h>
|
|
#include <linux/sched.h>
|
|
|
|
extern unsigned long get_free_context(struct mm_struct *mm);
|
|
extern void clear_context(unsigned long context);
|
|
|
|
/* set the context for a new task to unmapped */
|
|
static inline int init_new_context(struct task_struct *tsk,
|
|
struct mm_struct *mm)
|
|
{
|
|
mm->context = SUN3_INVALID_CONTEXT;
|
|
return 0;
|
|
}
|
|
|
|
/* find the context given to this process, and if it hasn't already
|
|
got one, go get one for it. */
|
|
static inline void get_mmu_context(struct mm_struct *mm)
|
|
{
|
|
if (mm->context == SUN3_INVALID_CONTEXT)
|
|
mm->context = get_free_context(mm);
|
|
}
|
|
|
|
/* flush context if allocated... */
|
|
static inline void destroy_context(struct mm_struct *mm)
|
|
{
|
|
if (mm->context != SUN3_INVALID_CONTEXT)
|
|
clear_context(mm->context);
|
|
}
|
|
|
|
static inline void activate_context(struct mm_struct *mm)
|
|
{
|
|
get_mmu_context(mm);
|
|
sun3_put_context(mm->context);
|
|
}
|
|
|
|
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
|
|
struct task_struct *tsk)
|
|
{
|
|
activate_context(tsk->mm);
|
|
}
|
|
|
|
#define deactivate_mm(tsk, mm) do { } while (0)
|
|
|
|
static inline void activate_mm(struct mm_struct *prev_mm,
|
|
struct mm_struct *next_mm)
|
|
{
|
|
activate_context(next_mm);
|
|
}
|
|
|
|
#else
|
|
|
|
#include <asm/setup.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgalloc.h>
|
|
|
|
static inline int init_new_context(struct task_struct *tsk,
|
|
struct mm_struct *mm)
|
|
{
|
|
mm->context = virt_to_phys(mm->pgd);
|
|
return 0;
|
|
}
|
|
|
|
#define destroy_context(mm) do { } while(0)
|
|
|
|
static inline void switch_mm_0230(struct mm_struct *mm)
|
|
{
|
|
unsigned long crp[2] = {
|
|
0x80000000 | _PAGE_TABLE, mm->context
|
|
};
|
|
unsigned long tmp;
|
|
|
|
asm volatile (".chip 68030");
|
|
|
|
/* flush MC68030/MC68020 caches (they are virtually addressed) */
|
|
asm volatile (
|
|
"movec %%cacr,%0;"
|
|
"orw %1,%0; "
|
|
"movec %0,%%cacr"
|
|
: "=d" (tmp) : "di" (FLUSH_I_AND_D));
|
|
|
|
/* Switch the root pointer. For a 030-only kernel,
|
|
* avoid flushing the whole ATC, we only need to
|
|
* flush the user entries. The 68851 does this by
|
|
* itself. Avoid a runtime check here.
|
|
*/
|
|
asm volatile (
|
|
#ifdef CPU_M68030_ONLY
|
|
"pmovefd %0,%%crp; "
|
|
"pflush #0,#4"
|
|
#else
|
|
"pmove %0,%%crp"
|
|
#endif
|
|
: : "m" (crp[0]));
|
|
|
|
asm volatile (".chip 68k");
|
|
}
|
|
|
|
static inline void switch_mm_0460(struct mm_struct *mm)
|
|
{
|
|
asm volatile (".chip 68040");
|
|
|
|
/* flush address translation cache (user entries) */
|
|
asm volatile ("pflushan");
|
|
|
|
/* switch the root pointer */
|
|
asm volatile ("movec %0,%%urp" : : "r" (mm->context));
|
|
|
|
if (CPU_IS_060) {
|
|
unsigned long tmp;
|
|
|
|
/* clear user entries in the branch cache */
|
|
asm volatile (
|
|
"movec %%cacr,%0; "
|
|
"orl %1,%0; "
|
|
"movec %0,%%cacr"
|
|
: "=d" (tmp): "di" (0x00200000));
|
|
}
|
|
|
|
asm volatile (".chip 68k");
|
|
}
|
|
|
|
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
|
|
{
|
|
if (prev != next) {
|
|
if (CPU_IS_020_OR_030)
|
|
switch_mm_0230(next);
|
|
else
|
|
switch_mm_0460(next);
|
|
}
|
|
}
|
|
|
|
#define deactivate_mm(tsk,mm) do { } while (0)
|
|
|
|
static inline void activate_mm(struct mm_struct *prev_mm,
|
|
struct mm_struct *next_mm)
|
|
{
|
|
next_mm->context = virt_to_phys(next_mm->pgd);
|
|
|
|
if (CPU_IS_020_OR_030)
|
|
switch_mm_0230(next_mm);
|
|
else
|
|
switch_mm_0460(next_mm);
|
|
}
|
|
|
|
#endif
|
|
|
|
#else /* !CONFIG_MMU */
|
|
|
|
static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
|
|
{
|
|
}
|
|
|
|
#define destroy_context(mm) do { } while (0)
|
|
#define deactivate_mm(tsk,mm) do { } while (0)
|
|
|
|
static inline void activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_MMU */
|
|
#endif /* __M68K_MMU_CONTEXT_H */
|