/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 1999 Niibe Yutaka * Copyright (C) 2003 - 2007 Paul Mundt * * ASID handling idea taken from MIPS implementation. */ #ifndef __ASM_SH_MMU_CONTEXT_H #define __ASM_SH_MMU_CONTEXT_H #ifdef __KERNEL__ #include <cpu/mmu_context.h> #include <asm/tlbflush.h> #include <linux/uaccess.h> #include <linux/mm_types.h> #include <asm/io.h> #include <asm-generic/mm_hooks.h> /* * The MMU "context" consists of two things: * (a) TLB cache version (or round, cycle whatever expression you like) * (b) ASID (Address Space IDentifier) */ #ifdef CONFIG_CPU_HAS_PTEAEX #define MMU_CONTEXT_ASID_MASK 0x0000ffff #else #define MMU_CONTEXT_ASID_MASK 0x000000ff #endif #define MMU_CONTEXT_VERSION_MASK (~0UL & ~MMU_CONTEXT_ASID_MASK) #define MMU_CONTEXT_FIRST_VERSION (MMU_CONTEXT_ASID_MASK + 1) /* Impossible ASID value, to differentiate from NO_CONTEXT. */ #define MMU_NO_ASID MMU_CONTEXT_FIRST_VERSION #define NO_CONTEXT 0UL #define asid_cache(cpu) (cpu_data[cpu].asid_cache) #ifdef CONFIG_MMU #define cpu_context(cpu, mm) ((mm)->context.id[cpu]) #define cpu_asid(cpu, mm) \ (cpu_context((cpu), (mm)) & MMU_CONTEXT_ASID_MASK) /* * Virtual Page Number mask */ #define MMU_VPN_MASK 0xfffff000 #if defined(CONFIG_SUPERH32) #include <asm/mmu_context_32.h> #else #include <asm/mmu_context_64.h> #endif /* * Get MMU context if needed. */ static inline void get_mmu_context(struct mm_struct *mm, unsigned int cpu) { unsigned long asid = asid_cache(cpu); /* Check if we have old version of context. */ if (((cpu_context(cpu, mm) ^ asid) & MMU_CONTEXT_VERSION_MASK) == 0) /* It's up to date, do nothing */ return; /* It's old, we need to get new context with new version. */ if (!(++asid & MMU_CONTEXT_ASID_MASK)) { /* * We exhaust ASID of this version. * Flush all TLB and start new cycle. */ local_flush_tlb_all(); #ifdef CONFIG_SUPERH64 /* * The SH-5 cache uses the ASIDs, requiring both the I and D * cache to be flushed when the ASID is exhausted. Weak. */ flush_cache_all(); #endif /* * Fix version; Note that we avoid version #0 * to distinguish NO_CONTEXT. */ if (!asid) asid = MMU_CONTEXT_FIRST_VERSION; } cpu_context(cpu, mm) = asid_cache(cpu) = asid; } /* * Initialize the context related info for a new mm_struct * instance. */ static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) { int i; for_each_online_cpu(i) cpu_context(i, mm) = NO_CONTEXT; return 0; } /* * 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_context(struct mm_struct *mm, unsigned int cpu) { get_mmu_context(mm, cpu); set_asid(cpu_asid(cpu, mm)); } static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { unsigned int cpu = smp_processor_id(); if (likely(prev != next)) { cpumask_set_cpu(cpu, mm_cpumask(next)); set_TTB(next->pgd); activate_context(next, cpu); } else if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next))) activate_context(next, cpu); } #define activate_mm(prev, next) switch_mm((prev),(next),NULL) #define deactivate_mm(tsk,mm) do { } while (0) #define enter_lazy_tlb(mm,tsk) do { } while (0) #else #define set_asid(asid) do { } while (0) #define get_asid() (0) #define cpu_asid(cpu, mm) ({ (void)cpu; NO_CONTEXT; }) #define switch_and_save_asid(asid) (0) #define set_TTB(pgd) do { } while (0) #define get_TTB() (0) #include <asm-generic/mmu_context.h> #endif /* CONFIG_MMU */ #if defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4) /* * If this processor has an MMU, we need methods to turn it off/on .. * paging_init() will also have to be updated for the processor in * question. */ static inline void enable_mmu(void) { unsigned int cpu = smp_processor_id(); /* Enable MMU */ __raw_writel(MMU_CONTROL_INIT, MMUCR); ctrl_barrier(); if (asid_cache(cpu) == NO_CONTEXT) asid_cache(cpu) = MMU_CONTEXT_FIRST_VERSION; set_asid(asid_cache(cpu) & MMU_CONTEXT_ASID_MASK); } static inline void disable_mmu(void) { unsigned long cr; cr = __raw_readl(MMUCR); cr &= ~MMU_CONTROL_INIT; __raw_writel(cr, MMUCR); ctrl_barrier(); } #else /* * MMU control handlers for processors lacking memory * management hardware. */ #define enable_mmu() do { } while (0) #define disable_mmu() do { } while (0) #endif #endif /* __KERNEL__ */ #endif /* __ASM_SH_MMU_CONTEXT_H */
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Kbuild | File | 467 B | 0644 |
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adc.h | File | 253 B | 0644 |
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addrspace.h | File | 2.03 KB | 0644 |
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alignment.h | File | 654 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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atomic-grb.h | File | 2.6 KB | 0644 |
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atomic-irq.h | File | 1.63 KB | 0644 |
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atomic-llsc.h | File | 2.12 KB | 0644 |
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atomic.h | File | 1.78 KB | 0644 |
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barrier.h | File | 1.52 KB | 0644 |
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bitops-cas.h | File | 1.73 KB | 0644 |
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bitops-grb.h | File | 6.21 KB | 0644 |
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bitops-llsc.h | File | 2.79 KB | 0644 |
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bitops-op32.h | File | 3.78 KB | 0644 |
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bitops.h | File | 2.38 KB | 0644 |
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bl_bit.h | File | 216 B | 0644 |
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bl_bit_32.h | File | 639 B | 0644 |
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bl_bit_64.h | File | 979 B | 0644 |
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bug.h | File | 2.77 KB | 0644 |
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bugs.h | File | 1.38 KB | 0644 |
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cache.h | File | 1.2 KB | 0644 |
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cache_insns.h | File | 242 B | 0644 |
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cache_insns_32.h | File | 642 B | 0644 |
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cache_insns_64.h | File | 839 B | 0644 |
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cacheflush.h | File | 3.58 KB | 0644 |
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checksum.h | File | 140 B | 0644 |
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checksum_32.h | File | 5.21 KB | 0644 |
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clock.h | File | 436 B | 0644 |
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cmpxchg-cas.h | File | 549 B | 0644 |
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cmpxchg-grb.h | File | 2.8 KB | 0644 |
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cmpxchg-irq.h | File | 1.04 KB | 0644 |
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cmpxchg-llsc.h | File | 1.06 KB | 0644 |
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cmpxchg-xchg.h | File | 1.33 KB | 0644 |
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cmpxchg.h | File | 1.77 KB | 0644 |
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device.h | File | 450 B | 0644 |
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dma-mapping.h | File | 694 B | 0644 |
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dma-register.h | File | 1.8 KB | 0644 |
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dma.h | File | 3.74 KB | 0644 |
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dmabrg.h | File | 536 B | 0644 |
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dwarf.h | File | 9.8 KB | 0644 |
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elf.h | File | 7.28 KB | 0644 |
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entry-macros.S | File | 1.85 KB | 0644 |
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extable.h | File | 227 B | 0644 |
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fb.h | File | 375 B | 0644 |
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fixmap.h | File | 2.92 KB | 0644 |
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flat.h | File | 1.23 KB | 0644 |
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fpu.h | File | 1.77 KB | 0644 |
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freq.h | File | 472 B | 0644 |
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ftrace.h | File | 1.11 KB | 0644 |
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futex-cas.h | File | 728 B | 0644 |
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futex-irq.h | File | 482 B | 0644 |
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futex-llsc.h | File | 870 B | 0644 |
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futex.h | File | 1.5 KB | 0644 |
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gpio.h | File | 1017 B | 0644 |
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hardirq.h | File | 440 B | 0644 |
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hd64461.h | File | 11.79 KB | 0644 |
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heartbeat.h | File | 383 B | 0644 |
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hugetlb.h | File | 1.96 KB | 0644 |
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hw_breakpoint.h | File | 1.88 KB | 0644 |
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hw_irq.h | File | 915 B | 0644 |
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i2c-sh7760.h | File | 406 B | 0644 |
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io.h | File | 11.33 KB | 0644 |
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io_generic.h | File | 661 B | 0644 |
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io_noioport.h | File | 1.09 KB | 0644 |
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io_trapped.h | File | 1.44 KB | 0644 |
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irq.h | File | 1.68 KB | 0644 |
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irqflags.h | File | 226 B | 0644 |
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kdebug.h | File | 406 B | 0644 |
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kexec.h | File | 2.61 KB | 0644 |
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kgdb.h | File | 851 B | 0644 |
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kmap_types.h | File | 265 B | 0644 |
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kprobes.h | File | 1.51 KB | 0644 |
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linkage.h | File | 154 B | 0644 |
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machvec.h | File | 939 B | 0644 |
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mmu.h | File | 2.18 KB | 0644 |
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mmu_context.h | File | 4.44 KB | 0644 |
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mmu_context_32.h | File | 1.28 KB | 0644 |
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mmu_context_64.h | File | 1.97 KB | 0644 |
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mmzone.h | File | 1.1 KB | 0644 |
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module.h | File | 1005 B | 0644 |
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page.h | File | 6.06 KB | 0644 |
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pci.h | File | 3.19 KB | 0644 |
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perf_event.h | File | 797 B | 0644 |
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pgalloc.h | File | 1.86 KB | 0644 |
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pgtable-2level.h | File | 598 B | 0644 |
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pgtable-3level.h | File | 1.54 KB | 0644 |
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pgtable.h | File | 4 KB | 0644 |
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pgtable_32.h | File | 16.37 KB | 0644 |
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pgtable_64.h | File | 11.32 KB | 0644 |
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posix_types.h | File | 146 B | 0644 |
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processor.h | File | 4.41 KB | 0644 |
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processor_32.h | File | 4.67 KB | 0644 |
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processor_64.h | File | 5.54 KB | 0644 |
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ptrace.h | File | 3.39 KB | 0644 |
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ptrace_32.h | File | 307 B | 0644 |
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ptrace_64.h | File | 312 B | 0644 |
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push-switch.h | File | 755 B | 0644 |
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reboot.h | File | 472 B | 0644 |
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romimage-macros.h | File | 1.1 KB | 0644 |
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rtc.h | File | 383 B | 0644 |
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seccomp.h | File | 280 B | 0644 |
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sections.h | File | 307 B | 0644 |
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segment.h | File | 879 B | 0644 |
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setup.h | File | 725 B | 0644 |
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sfp-machine.h | File | 3.43 KB | 0644 |
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sh7760fb.h | File | 5.61 KB | 0644 |
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sh_bios.h | File | 743 B | 0644 |
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shmparam.h | File | 629 B | 0644 |
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siu.h | File | 539 B | 0644 |
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smc37c93x.h | File | 5.56 KB | 0644 |
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smp-ops.h | File | 1012 B | 0644 |
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smp.h | File | 1.83 KB | 0644 |
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sparsemem.h | File | 443 B | 0644 |
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spi.h | File | 265 B | 0644 |
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spinlock-cas.h | File | 2.09 KB | 0644 |
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spinlock-llsc.h | File | 4.13 KB | 0644 |
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spinlock.h | File | 578 B | 0644 |
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spinlock_types.h | File | 463 B | 0644 |
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sram.h | File | 670 B | 0644 |
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stackprotector.h | File | 711 B | 0644 |
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stacktrace.h | File | 606 B | 0644 |
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string.h | File | 131 B | 0644 |
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string_32.h | File | 2.66 KB | 0644 |
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string_64.h | File | 499 B | 0644 |
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suspend.h | File | 2.52 KB | 0644 |
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switch_to.h | File | 492 B | 0644 |
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switch_to_32.h | File | 3.55 KB | 0644 |
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switch_to_64.h | File | 968 B | 0644 |
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syscall.h | File | 267 B | 0644 |
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syscall_32.h | File | 2.42 KB | 0644 |
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syscall_64.h | File | 1.79 KB | 0644 |
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syscalls.h | File | 564 B | 0644 |
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syscalls_32.h | File | 1022 B | 0644 |
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syscalls_64.h | File | 441 B | 0644 |
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thread_info.h | File | 5.32 KB | 0644 |
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timex.h | File | 637 B | 0644 |
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tlb.h | File | 4.12 KB | 0644 |
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tlb_64.h | File | 2.08 KB | 0644 |
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tlbflush.h | File | 1.77 KB | 0644 |
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topology.h | File | 645 B | 0644 |
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traps.h | File | 487 B | 0644 |
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traps_32.h | File | 1.31 KB | 0644 |
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traps_64.h | File | 851 B | 0644 |
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types.h | File | 411 B | 0644 |
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uaccess.h | File | 4.83 KB | 0644 |
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uaccess_32.h | File | 3.77 KB | 0644 |
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uaccess_64.h | File | 2.2 KB | 0644 |
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unaligned-sh4a.h | File | 4.51 KB | 0644 |
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unaligned.h | File | 359 B | 0644 |
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uncached.h | File | 1.34 KB | 0644 |
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unistd.h | File | 952 B | 0644 |
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unwinder.h | File | 856 B | 0644 |
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user.h | File | 2.52 KB | 0644 |
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vga.h | File | 98 B | 0644 |
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vmlinux.lds.h | File | 558 B | 0644 |
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watchdog.h | File | 4.14 KB | 0644 |
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word-at-a-time.h | File | 1.29 KB | 0644 |
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