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