63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
/* 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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