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93d77ada6c
The temperature calculation currently uses fixed point operations. Change it to use floating point for better readability and maintenance. Also changes disable_fpu() to accept parameter which serves as optimization barrier to prevent floating point operations after disabling FPU. BUG=chrome-os-partner:7801 TEST=In console, tempremote "tempremote 29715 -105000 6390" gives 28506. Change-Id: Ib766904b8feb9a78eac9f7cd53afeca85091c5a5 Signed-off-by: Vic Yang <victoryang@chromium.org>
30 lines
724 B
C
30 lines
724 B
C
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* FPU module for Chrome EC operating system */
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#include "task.h"
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void enable_fpu(void)
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{
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interrupt_disable();
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asm volatile("mrs r0, control;"
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"orr r0, r0, #(1 << 2);"
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"msr control, r0;"
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"isb;");
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}
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void disable_fpu(int32_t v)
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{
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/* Optimization barrier to force compiler generate floating point
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* calculation code for 'v' before disabling FPU. */
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asm volatile("" : : "r" (v) : "memory");
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asm volatile("mrs r0, control;"
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"bic r0, r0, #(1 << 2);"
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"msr control, r0;"
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"isb;");
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interrupt_enable();
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}
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