mirror of
https://github.com/hermitcore/libhermit.git
synced 2025-03-09 00:00:03 +01:00
34e7895d0a
- add initial support for aarch64 - SMP support is currently missing - uhyve and kernel are tested on Libre AML-S905X-CC (https://libre.computer/products/boards/aml-s905x-cc/) - only GICv2 support is integrated
117 lines
3.6 KiB
C
117 lines
3.6 KiB
C
/*
|
|
* Copyright (c) 2017, Stefan Lankes, RWTH Aachen University
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* * Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this
|
|
* software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
|
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/**
|
|
* @author Stefan Lankes
|
|
* @file arch/arm64/include/asm/irqflags.h
|
|
* @brief Functions related to IRQ configuration
|
|
*
|
|
* This file contains definitions of inline functions
|
|
* for enabling and disabling exception handling.
|
|
*/
|
|
|
|
#ifndef __ARCH_IRQFLAGS_H__
|
|
#define __ARCH_IRQFLAGS_H__
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#define IRQ_FLAG_F (1<<6)
|
|
#define IRQ_FLAG_I (1<<7)
|
|
#define IRQ_FLAG_A (1<<8)
|
|
#define IRQ_FLAG_D (1<<9)
|
|
|
|
inline static uint32_t get_daif(void)
|
|
{
|
|
size_t flags;
|
|
asm volatile("mrs %0, daif" : "=r"(flags) :: "memory");
|
|
return flags;
|
|
}
|
|
|
|
/** @brief Determines, if the exception bit mask bits (DAIF) allows exceptions
|
|
*
|
|
* @return
|
|
* - 1 DAIF is cleared and allows exceptions
|
|
* - 0 DAIF is cleared and allows exceptions
|
|
*/
|
|
inline static uint8_t is_irq_enabled(void)
|
|
{
|
|
size_t flags = get_daif();
|
|
if (flags & (IRQ_FLAG_A|IRQ_FLAG_I|IRQ_FLAG_F))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
/** @brief Disable IRQs
|
|
*
|
|
* This inline function just set the exception bit mask bits
|
|
*/
|
|
static inline void irq_disable(void) {
|
|
asm volatile("msr daifset, 0b111" ::: "memory");
|
|
}
|
|
|
|
/** @brief Enable IRQs
|
|
*
|
|
* This inline function just clear out the exception bit mask bits
|
|
*/
|
|
static inline void irq_enable(void) {
|
|
asm volatile("msr daifclr, 0b111" ::: "memory");
|
|
}
|
|
|
|
/** @brief Disable IRQs (nested)
|
|
*
|
|
* Disable IRQs when unsure if IRQs were enabled at all.
|
|
* This function together with irq_nested_enable can be used
|
|
* in situations when interrupts shouldn't be activated if they
|
|
* were not activated before calling this function.
|
|
*
|
|
* @return Whether IRQs had been enabled or not before disabling
|
|
*/
|
|
inline static uint8_t irq_nested_disable(void) {
|
|
uint8_t was_enabled = is_irq_enabled();
|
|
irq_disable();
|
|
return was_enabled;
|
|
}
|
|
|
|
/** @brief Enable IRQs (nested)
|
|
*
|
|
* Can be used in conjunction with irq_nested_disable() to only enable
|
|
* interrupts again if they were enabled before.
|
|
*
|
|
* @param was_enabled Whether IRQs should be enabled or not
|
|
*/
|
|
inline static void irq_nested_enable(uint8_t was_enabled) {
|
|
if (was_enabled)
|
|
irq_enable();
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|