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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2013 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/cache.h>
#include <grub/misc.h>
static grub_int64_t dlinesz;
static grub_int64_t ilinesz;
/* Prototypes for asm functions. */
void grub_arch_clean_dcache_range (grub_addr_t beg, grub_addr_t end,
grub_uint64_t line_size);
void grub_arch_invalidate_icache_range (grub_addr_t beg, grub_addr_t end,
grub_uint64_t line_size);
static void
probe_caches (void)
{
grub_uint64_t cache_type;
/* Read Cache Type Register */
asm volatile ("mrs %0, ctr_el0": "=r"(cache_type));
dlinesz = 4 << ((cache_type >> 16) & 0xf);
ilinesz = 4 << (cache_type & 0xf);
grub_dprintf("cache", "D$ line size: %lld\n", (long long) dlinesz);
grub_dprintf("cache", "I$ line size: %lld\n", (long long) ilinesz);
}
void
grub_arch_sync_caches (void *address, grub_size_t len)
{
grub_uint64_t start, end, max_align;
if (dlinesz == 0)
probe_caches();
if (dlinesz == 0)
grub_fatal ("Unknown cache line size!");
max_align = dlinesz > ilinesz ? dlinesz : ilinesz;
start = ALIGN_DOWN ((grub_uint64_t) address, max_align);
end = ALIGN_UP ((grub_uint64_t) address + len, max_align);
grub_arch_clean_dcache_range (start, end, dlinesz);
grub_arch_invalidate_icache_range (start, end, ilinesz);
}
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