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// SPDX-License-Identifier: GPL-2.0
/*
* simple_ring_buffer is used by the pKVM hypervisor which does not have access
* to all kernel symbols. Whatever is undefined when compiling this file is
* compiler and tooling-generated symbols that can safely be ignored for
* simple_ring_buffer.
*/
#include <linux/atomic.h>
#include <linux/string.h>
#include <asm/page.h>
void undefsyms_base(void *p, int n);
static char page[PAGE_SIZE] __aligned(PAGE_SIZE);
void undefsyms_base(void *p, int n)
{
char buffer[256] = { 0 };
u32 u = 0;
memset((char * volatile)page, 8, PAGE_SIZE);
memset((char * volatile)buffer, 8, sizeof(buffer));
memcpy((void * volatile)p, buffer, sizeof(buffer));
cmpxchg((u32 * volatile)&u, 0, 8);
WARN_ON(n == 0xdeadbeef);
}
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