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// SPDX-License-Identifier: GPL-2.0
#include <asm/rwonce.h>
#include <asm/page.h>
#include <asm/skey.h>
int skey_regions_initialized;
static inline unsigned long load_real_address(unsigned long address)
{
unsigned long real;
asm volatile(
" lra %[real],0(%[address])"
: [real] "=d" (real)
: [address] "a" (address)
: "cc");
return real;
}
/*
* Initialize storage keys of registered memory regions with the
* default key. This is useful for code which is executed with a
* non-default access key.
*/
void __skey_regions_initialize(void)
{
unsigned long address, real;
struct skey_region *r, *end;
r = __skey_region_start;
end = __skey_region_end;
while (r < end) {
address = r->start & PAGE_MASK;
do {
real = load_real_address(address);
page_set_storage_key(real, PAGE_DEFAULT_KEY, 1);
address += PAGE_SIZE;
} while (address < r->end);
r++;
}
/*
* Make sure storage keys are initialized before
* skey_regions_initialized is changed.
*/
barrier();
WRITE_ONCE(skey_regions_initialized, 1);
}
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