7d16196a8e
Extended the 32bit CPU counter to 64bit by adding a static variable that takes into account CPU counter overflow. The varibale is updated everythime the timer_raw_value function is called so I assume that the function is called often enought to not miss an overflow of the CPU counter. BUG=chrome-os-partner:31438 TEST=tested on Pistachio bring up board; works as expected BRANCH=none Change-Id: I98bcc56e600dcff0c6da7c140dd34faec5e00885 Signed-off-by: Stefan Reinauer <reinauer@chromium.org> Original-Commit-Id: 972b105f950d800fa44f27bce090f6b89a5a84b9 Original-Change-Id: Id67b14e9d9c2354bc417b6587b615d466690c9b7 Original-Signed-off-by: Ionela Voinescu <ionela.voinescu@imgtec.com> Original-Reviewed-on: https://chromium-review.googlesource.com/247642 Original-Reviewed-by: Daniel Ehrenberg <dehrenberg@chromium.org> Reviewed-on: http://review.coreboot.org/9672 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>
42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
/*
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* This file is part of the libpayload project.
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*
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* Copyright (C) 2014 Imagination Technologies
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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; version 2 of the License.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <libpayload.h>
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#include <arch/cpu.h>
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uint64_t timer_hz(void)
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{
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return lib_sysinfo.cpu_khz * 1000;
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}
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uint64_t timer_raw_value(void)
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{
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static uint64_t total_ticks = 0;
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uint8_t overflow = 0;
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uint32_t current_ticks = read_c0_count() * 2;
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/* It assumes only one overflow happened since the last call */
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if (current_ticks <= (uint32_t)total_ticks)
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overflow = 1;
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/* The least significant part(32 bits) of total_ticks will always
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* become equal to current ticks */
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total_ticks = (((total_ticks >> 32) + overflow) << 32) +
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current_ticks;
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return total_ticks;
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}
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