1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _ALPHA_CACHEFLUSH_H
3*4882a593Smuzhiyun #define _ALPHA_CACHEFLUSH_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/mm.h>
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun /* Note that the following two definitions are _highly_ dependent
8*4882a593Smuzhiyun on the contexts in which they are used in the kernel. I personally
9*4882a593Smuzhiyun think it is criminal how loosely defined these macros are. */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun /* We need to flush the kernel's icache after loading modules. The
12*4882a593Smuzhiyun only other use of this macro is in load_aout_interp which is not
13*4882a593Smuzhiyun used on Alpha.
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun Note that this definition should *not* be used for userspace
16*4882a593Smuzhiyun icache flushing. While functional, it is _way_ overkill. The
17*4882a593Smuzhiyun icache is tagged with ASNs and it suffices to allocate a new ASN
18*4882a593Smuzhiyun for the process. */
19*4882a593Smuzhiyun #ifndef CONFIG_SMP
20*4882a593Smuzhiyun #define flush_icache_range(start, end) imb()
21*4882a593Smuzhiyun #else
22*4882a593Smuzhiyun #define flush_icache_range(start, end) smp_imb()
23*4882a593Smuzhiyun extern void smp_imb(void);
24*4882a593Smuzhiyun #endif
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun /* We need to flush the userspace icache after setting breakpoints in
27*4882a593Smuzhiyun ptrace.
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun Instead of indiscriminately using imb, take advantage of the fact
30*4882a593Smuzhiyun that icache entries are tagged with the ASN and load a new mm context. */
31*4882a593Smuzhiyun /* ??? Ought to use this in arch/alpha/kernel/signal.c too. */
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun #ifndef CONFIG_SMP
34*4882a593Smuzhiyun #include <linux/sched.h>
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun extern void __load_new_mm_context(struct mm_struct *);
37*4882a593Smuzhiyun static inline void
flush_icache_user_page(struct vm_area_struct * vma,struct page * page,unsigned long addr,int len)38*4882a593Smuzhiyun flush_icache_user_page(struct vm_area_struct *vma, struct page *page,
39*4882a593Smuzhiyun unsigned long addr, int len)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun if (vma->vm_flags & VM_EXEC) {
42*4882a593Smuzhiyun struct mm_struct *mm = vma->vm_mm;
43*4882a593Smuzhiyun if (current->active_mm == mm)
44*4882a593Smuzhiyun __load_new_mm_context(mm);
45*4882a593Smuzhiyun else
46*4882a593Smuzhiyun mm->context[smp_processor_id()] = 0;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun #define flush_icache_user_page flush_icache_user_page
50*4882a593Smuzhiyun #else /* CONFIG_SMP */
51*4882a593Smuzhiyun extern void flush_icache_user_page(struct vm_area_struct *vma,
52*4882a593Smuzhiyun struct page *page, unsigned long addr, int len);
53*4882a593Smuzhiyun #define flush_icache_user_page flush_icache_user_page
54*4882a593Smuzhiyun #endif /* CONFIG_SMP */
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun /* This is used only in __do_fault and do_swap_page. */
57*4882a593Smuzhiyun #define flush_icache_page(vma, page) \
58*4882a593Smuzhiyun flush_icache_user_page((vma), (page), 0, 0)
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun #include <asm-generic/cacheflush.h>
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun #endif /* _ALPHA_CACHEFLUSH_H */
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