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62 lines
2.0 KiB
62 lines
2.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ALPHA_CACHEFLUSH_H |
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#define _ALPHA_CACHEFLUSH_H |
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#include <linux/mm.h> |
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/* Note that the following two definitions are _highly_ dependent |
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on the contexts in which they are used in the kernel. I personally |
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think it is criminal how loosely defined these macros are. */ |
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/* We need to flush the kernel's icache after loading modules. The |
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only other use of this macro is in load_aout_interp which is not |
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used on Alpha. |
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Note that this definition should *not* be used for userspace |
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icache flushing. While functional, it is _way_ overkill. The |
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icache is tagged with ASNs and it suffices to allocate a new ASN |
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for the process. */ |
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#ifndef CONFIG_SMP |
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#define flush_icache_range(start, end) imb() |
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#else |
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#define flush_icache_range(start, end) smp_imb() |
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extern void smp_imb(void); |
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#endif |
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/* We need to flush the userspace icache after setting breakpoints in |
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ptrace. |
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Instead of indiscriminately using imb, take advantage of the fact |
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that icache entries are tagged with the ASN and load a new mm context. */ |
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/* ??? Ought to use this in arch/alpha/kernel/signal.c too. */ |
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#ifndef CONFIG_SMP |
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#include <linux/sched.h> |
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extern void __load_new_mm_context(struct mm_struct *); |
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static inline void |
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flush_icache_user_page(struct vm_area_struct *vma, struct page *page, |
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unsigned long addr, int len) |
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{ |
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if (vma->vm_flags & VM_EXEC) { |
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struct mm_struct *mm = vma->vm_mm; |
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if (current->active_mm == mm) |
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__load_new_mm_context(mm); |
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else |
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mm->context[smp_processor_id()] = 0; |
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} |
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} |
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#define flush_icache_user_page flush_icache_user_page |
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#else /* CONFIG_SMP */ |
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extern void flush_icache_user_page(struct vm_area_struct *vma, |
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struct page *page, unsigned long addr, int len); |
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#define flush_icache_user_page flush_icache_user_page |
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#endif /* CONFIG_SMP */ |
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/* This is used only in __do_fault and do_swap_page. */ |
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#define flush_icache_page(vma, page) \ |
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flush_icache_user_page((vma), (page), 0, 0) |
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#include <asm-generic/cacheflush.h> |
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#endif /* _ALPHA_CACHEFLUSH_H */
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