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320 lines
7.0 KiB
320 lines
7.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __M68K_MMU_CONTEXT_H |
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#define __M68K_MMU_CONTEXT_H |
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#include <asm-generic/mm_hooks.h> |
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#include <linux/mm_types.h> |
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#ifdef CONFIG_MMU |
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#if defined(CONFIG_COLDFIRE) |
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#include <asm/atomic.h> |
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#include <asm/bitops.h> |
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#include <asm/mcfmmu.h> |
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#include <asm/mmu.h> |
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#define NO_CONTEXT 256 |
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#define LAST_CONTEXT 255 |
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#define FIRST_CONTEXT 1 |
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extern unsigned long context_map[]; |
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extern mm_context_t next_mmu_context; |
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extern atomic_t nr_free_contexts; |
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extern struct mm_struct *context_mm[LAST_CONTEXT+1]; |
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extern void steal_context(void); |
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static inline void get_mmu_context(struct mm_struct *mm) |
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{ |
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mm_context_t ctx; |
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if (mm->context != NO_CONTEXT) |
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return; |
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while (arch_atomic_dec_and_test_lt(&nr_free_contexts)) { |
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atomic_inc(&nr_free_contexts); |
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steal_context(); |
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} |
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ctx = next_mmu_context; |
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while (test_and_set_bit(ctx, context_map)) { |
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ctx = find_next_zero_bit(context_map, LAST_CONTEXT+1, ctx); |
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if (ctx > LAST_CONTEXT) |
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ctx = 0; |
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} |
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next_mmu_context = (ctx + 1) & LAST_CONTEXT; |
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mm->context = ctx; |
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context_mm[ctx] = mm; |
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} |
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/* |
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* Set up the context for a new address space. |
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*/ |
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#define init_new_context(tsk, mm) (((mm)->context = NO_CONTEXT), 0) |
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/* |
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* We're finished using the context for an address space. |
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*/ |
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#define destroy_context destroy_context |
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static inline void destroy_context(struct mm_struct *mm) |
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{ |
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if (mm->context != NO_CONTEXT) { |
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clear_bit(mm->context, context_map); |
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mm->context = NO_CONTEXT; |
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atomic_inc(&nr_free_contexts); |
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} |
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} |
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static inline void set_context(mm_context_t context, pgd_t *pgd) |
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{ |
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__asm__ __volatile__ ("movec %0,%%asid" : : "d" (context)); |
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} |
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static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, |
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struct task_struct *tsk) |
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{ |
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get_mmu_context(tsk->mm); |
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set_context(tsk->mm->context, next->pgd); |
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} |
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/* |
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* After we have set current->mm to a new value, this activates |
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* the context for the new mm so we see the new mappings. |
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*/ |
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#define activate_mm activate_mm |
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static inline void activate_mm(struct mm_struct *active_mm, |
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struct mm_struct *mm) |
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{ |
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get_mmu_context(mm); |
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set_context(mm->context, mm->pgd); |
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} |
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#define prepare_arch_switch(next) load_ksp_mmu(next) |
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static inline void load_ksp_mmu(struct task_struct *task) |
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{ |
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unsigned long flags; |
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struct mm_struct *mm; |
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int asid; |
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pgd_t *pgd; |
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p4d_t *p4d; |
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pud_t *pud; |
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pmd_t *pmd; |
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pte_t *pte; |
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unsigned long mmuar; |
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local_irq_save(flags); |
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mmuar = task->thread.ksp; |
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/* Search for a valid TLB entry, if one is found, don't remap */ |
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mmu_write(MMUAR, mmuar); |
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mmu_write(MMUOR, MMUOR_STLB | MMUOR_ADR); |
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if (mmu_read(MMUSR) & MMUSR_HIT) |
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goto end; |
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if (mmuar >= PAGE_OFFSET) { |
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mm = &init_mm; |
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} else { |
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pr_info("load_ksp_mmu: non-kernel mm found: 0x%p\n", task->mm); |
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mm = task->mm; |
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} |
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if (!mm) |
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goto bug; |
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pgd = pgd_offset(mm, mmuar); |
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if (pgd_none(*pgd)) |
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goto bug; |
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p4d = p4d_offset(pgd, mmuar); |
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if (p4d_none(*p4d)) |
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goto bug; |
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pud = pud_offset(p4d, mmuar); |
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if (pud_none(*pud)) |
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goto bug; |
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pmd = pmd_offset(pud, mmuar); |
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if (pmd_none(*pmd)) |
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goto bug; |
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pte = (mmuar >= PAGE_OFFSET) ? pte_offset_kernel(pmd, mmuar) |
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: pte_offset_map(pmd, mmuar); |
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if (pte_none(*pte) || !pte_present(*pte)) |
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goto bug; |
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set_pte(pte, pte_mkyoung(*pte)); |
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asid = mm->context & 0xff; |
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if (!pte_dirty(*pte) && mmuar <= PAGE_OFFSET) |
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set_pte(pte, pte_wrprotect(*pte)); |
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mmu_write(MMUTR, (mmuar & PAGE_MASK) | (asid << MMUTR_IDN) | |
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(((int)(pte->pte) & (int)CF_PAGE_MMUTR_MASK) |
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>> CF_PAGE_MMUTR_SHIFT) | MMUTR_V); |
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mmu_write(MMUDR, (pte_val(*pte) & PAGE_MASK) | |
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((pte->pte) & CF_PAGE_MMUDR_MASK) | MMUDR_SZ_8KB | MMUDR_X); |
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mmu_write(MMUOR, MMUOR_ACC | MMUOR_UAA); |
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goto end; |
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bug: |
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pr_info("ksp load failed: mm=0x%p ksp=0x08%lx\n", mm, mmuar); |
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end: |
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local_irq_restore(flags); |
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} |
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#elif defined(CONFIG_SUN3) |
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#include <asm/sun3mmu.h> |
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#include <linux/sched.h> |
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extern unsigned long get_free_context(struct mm_struct *mm); |
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extern void clear_context(unsigned long context); |
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/* set the context for a new task to unmapped */ |
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#define init_new_context init_new_context |
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static inline int init_new_context(struct task_struct *tsk, |
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struct mm_struct *mm) |
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{ |
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mm->context = SUN3_INVALID_CONTEXT; |
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return 0; |
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} |
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/* find the context given to this process, and if it hasn't already |
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got one, go get one for it. */ |
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static inline void get_mmu_context(struct mm_struct *mm) |
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{ |
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if (mm->context == SUN3_INVALID_CONTEXT) |
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mm->context = get_free_context(mm); |
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} |
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/* flush context if allocated... */ |
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#define destroy_context destroy_context |
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static inline void destroy_context(struct mm_struct *mm) |
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{ |
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if (mm->context != SUN3_INVALID_CONTEXT) |
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clear_context(mm->context); |
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} |
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static inline void activate_context(struct mm_struct *mm) |
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{ |
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get_mmu_context(mm); |
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sun3_put_context(mm->context); |
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} |
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static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, |
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struct task_struct *tsk) |
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{ |
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activate_context(tsk->mm); |
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} |
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#define activate_mm activate_mm |
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static inline void activate_mm(struct mm_struct *prev_mm, |
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struct mm_struct *next_mm) |
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{ |
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activate_context(next_mm); |
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} |
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#else |
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#include <asm/setup.h> |
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#include <asm/page.h> |
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#include <asm/cacheflush.h> |
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#define init_new_context init_new_context |
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static inline int init_new_context(struct task_struct *tsk, |
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struct mm_struct *mm) |
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{ |
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mm->context = virt_to_phys(mm->pgd); |
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return 0; |
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} |
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static inline void switch_mm_0230(struct mm_struct *mm) |
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{ |
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unsigned long crp[2] = { |
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0x80000000 | _PAGE_TABLE, mm->context |
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}; |
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unsigned long tmp; |
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asm volatile (".chip 68030"); |
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/* flush MC68030/MC68020 caches (they are virtually addressed) */ |
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asm volatile ( |
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"movec %%cacr,%0;" |
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"orw %1,%0; " |
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"movec %0,%%cacr" |
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: "=d" (tmp) : "di" (FLUSH_I_AND_D)); |
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/* Switch the root pointer. For a 030-only kernel, |
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* avoid flushing the whole ATC, we only need to |
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* flush the user entries. The 68851 does this by |
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* itself. Avoid a runtime check here. |
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*/ |
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asm volatile ( |
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#ifdef CPU_M68030_ONLY |
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"pmovefd %0,%%crp; " |
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"pflush #0,#4" |
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#else |
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"pmove %0,%%crp" |
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#endif |
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: : "m" (crp[0])); |
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asm volatile (".chip 68k"); |
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} |
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static inline void switch_mm_0460(struct mm_struct *mm) |
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{ |
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asm volatile (".chip 68040"); |
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/* flush address translation cache (user entries) */ |
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asm volatile ("pflushan"); |
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/* switch the root pointer */ |
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asm volatile ("movec %0,%%urp" : : "r" (mm->context)); |
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if (CPU_IS_060) { |
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unsigned long tmp; |
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/* clear user entries in the branch cache */ |
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asm volatile ( |
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"movec %%cacr,%0; " |
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"orl %1,%0; " |
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"movec %0,%%cacr" |
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: "=d" (tmp): "di" (0x00200000)); |
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} |
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asm volatile (".chip 68k"); |
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} |
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static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) |
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{ |
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if (prev != next) { |
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if (CPU_IS_020_OR_030) |
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switch_mm_0230(next); |
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else |
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switch_mm_0460(next); |
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} |
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} |
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#define activate_mm activate_mm |
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static inline void activate_mm(struct mm_struct *prev_mm, |
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struct mm_struct *next_mm) |
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{ |
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next_mm->context = virt_to_phys(next_mm->pgd); |
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if (CPU_IS_020_OR_030) |
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switch_mm_0230(next_mm); |
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else |
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switch_mm_0460(next_mm); |
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} |
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#endif |
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#include <asm-generic/mmu_context.h> |
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#else /* !CONFIG_MMU */ |
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#include <asm-generic/nommu_context.h> |
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#endif /* CONFIG_MMU */ |
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#endif /* __M68K_MMU_CONTEXT_H */
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