From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/alpha/include/asm/cacheflush.h | 62 +++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 arch/alpha/include/asm/cacheflush.h (limited to 'arch/alpha/include/asm/cacheflush.h') diff --git a/arch/alpha/include/asm/cacheflush.h b/arch/alpha/include/asm/cacheflush.h new file mode 100644 index 000000000..9945ff483 --- /dev/null +++ b/arch/alpha/include/asm/cacheflush.h @@ -0,0 +1,62 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ALPHA_CACHEFLUSH_H +#define _ALPHA_CACHEFLUSH_H + +#include + +/* Note that the following two definitions are _highly_ dependent + on the contexts in which they are used in the kernel. I personally + think it is criminal how loosely defined these macros are. */ + +/* We need to flush the kernel's icache after loading modules. The + only other use of this macro is in load_aout_interp which is not + used on Alpha. + + Note that this definition should *not* be used for userspace + icache flushing. While functional, it is _way_ overkill. The + icache is tagged with ASNs and it suffices to allocate a new ASN + for the process. */ +#ifndef CONFIG_SMP +#define flush_icache_range(start, end) imb() +#else +#define flush_icache_range(start, end) smp_imb() +extern void smp_imb(void); +#endif + +/* We need to flush the userspace icache after setting breakpoints in + ptrace. + + Instead of indiscriminately using imb, take advantage of the fact + that icache entries are tagged with the ASN and load a new mm context. */ +/* ??? Ought to use this in arch/alpha/kernel/signal.c too. */ + +#ifndef CONFIG_SMP +#include + +extern void __load_new_mm_context(struct mm_struct *); +static inline void +flush_icache_user_page(struct vm_area_struct *vma, struct page *page, + unsigned long addr, int len) +{ + if (vma->vm_flags & VM_EXEC) { + struct mm_struct *mm = vma->vm_mm; + if (current->active_mm == mm) + __load_new_mm_context(mm); + else + mm->context[smp_processor_id()] = 0; + } +} +#define flush_icache_user_page flush_icache_user_page +#else /* CONFIG_SMP */ +extern void flush_icache_user_page(struct vm_area_struct *vma, + struct page *page, unsigned long addr, int len); +#define flush_icache_user_page flush_icache_user_page +#endif /* CONFIG_SMP */ + +/* This is used only in __do_fault and do_swap_page. */ +#define flush_icache_page(vma, page) \ + flush_icache_user_page((vma), (page), 0, 0) + +#include + +#endif /* _ALPHA_CACHEFLUSH_H */ -- cgit v1.2.3