0b6ff78342
In program_segment_loaded, flush L1D to L2 only if the address of the loaded segment lies in the CAR region. Add an assert to ensure that the loaded segment does not cross CAR boundaries. Change-Id: Ie43e99299ed82f01518c8a1c1fd2bc64747d0c7b Signed-off-by: Furquan Shaikh <furquan@google.com> Reviewed-on: https://review.coreboot.org/14449 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins)
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2016 Intel Corp.
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* Copyright 2016 Google Inc.
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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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#include <arch/cpu.h>
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#include <assert.h>
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#include <program_loading.h>
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#include <soc/cpu.h>
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/*
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* This file supports the necessary hoops one needs to jump through since
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* early FSP component and early stages are running from cache-as-ram.
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*/
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static void flush_l1d_to_l2(void)
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{
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msr_t msr = rdmsr(MSR_POWER_MISC);
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msr.lo |= (1 << 8);
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wrmsr(MSR_POWER_MISC, msr);
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}
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static inline int is_car_addr(uintptr_t addr)
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{
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return ((addr >= CONFIG_DCACHE_RAM_BASE) &&
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(addr < (CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE)));
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}
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void platform_segment_loaded(uintptr_t start, size_t size, int flags)
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{
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/* Bail out if this is not the final segment. */
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if (!(flags & SEG_FINAL))
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return;
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char start_car_check = is_car_addr(start);
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char end_car_check = is_car_addr(start + size - 1);
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/* Bail out if loaded program segment does not lie in CAR region. */
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if (!start_car_check && !end_car_check)
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return;
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/* Loaded program segment should lie entirely within CAR region. */
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assert (start_car_check && end_car_check);
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flush_l1d_to_l2();
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}
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