73 lines
2.3 KiB
C
73 lines
2.3 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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grub_int64_t grub_arch_cache_dlinesz;
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grub_int64_t grub_arch_cache_ilinesz;
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/* Prototypes for asm functions. */
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void grub_arch_sync_caches_real (grub_uint64_t address, grub_uint64_t end);
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static void
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probe_caches (void)
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{
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grub_uint32_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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grub_arch_cache_dlinesz = 8 << ((cache_type >> 16) & 0xf);
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grub_arch_cache_ilinesz = 8 << (cache_type & 0xf);
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grub_dprintf("cache", "D$ line size: %lld\n",
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(long long) grub_arch_cache_dlinesz);
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grub_dprintf("cache", "I$ line size: %lld\n",
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(long long) grub_arch_cache_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;
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if (grub_arch_cache_dlinesz == 0)
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probe_caches();
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if (grub_arch_cache_dlinesz == 0)
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grub_fatal ("Unknown cache line size!");
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grub_dprintf("cache", "syncing caches for %p-%lx\n",
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address, (grub_addr_t) address + len);
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/* Align here to both cache lines. Saves a tiny bit of asm complexity and
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most of potential problems with different line sizes. */
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start = (grub_uint64_t) address;
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end = (grub_uint64_t) address + len;
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start = ALIGN_DOWN (start, grub_arch_cache_dlinesz);
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start = ALIGN_DOWN (start, grub_arch_cache_ilinesz);
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end = ALIGN_UP (end, grub_arch_cache_dlinesz);
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end = ALIGN_UP (end, grub_arch_cache_ilinesz);
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grub_dprintf("cache", "aligned to: %lx-%lx\n",
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start, end);
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grub_arch_sync_caches_real (start, end);
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}
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