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/** @file
* IPRT - ARM Specific Assembly Functions.
*/
/*
* Copyright (C) 2015-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#ifndef IPRT_INCLUDED_asm_arm_h
#define IPRT_INCLUDED_asm_arm_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <iprt/types.h>
#if !defined(RT_ARCH_ARM64) && !defined(RT_ARCH_ARM32)
# error "Not on ARM64 or ARM32"
#endif
/** @defgroup grp_rt_asm_arm ARM Specific ASM Routines
* @ingroup grp_rt_asm
* @{
*/
#if 0 /* figure out arm64 */
/**
* Get the CPSR (Current Program Status) register.
* @returns CPSR.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(RTCCUINTREG) ASMGetFlags(void);
#else
DECLINLINE(RTCCUINTREG) ASMGetFlags(void)
{
RTCCUINTREG uFlags;
# if RT_INLINE_ASM_GNU_STYLE
# ifdef RT_ARCH_ARM64
__asm__ __volatile__("mrs %0, nzcv\n\t" : "=r" (uFlags));
# else
__asm__ __volatile__("mrs %0, cpsr\n\t" : "=r" (uFlags));
# endif
# else
# error "Unsupported compiler"
# endif
return uFlags;
}
#endif
/**
* Set the CPSR register.
* @param uFlags The new CPSR value.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(void) ASMSetFlags(RTCCUINTREG uFlags);
#else
DECLINLINE(void) ASMSetFlags(RTCCUINTREG uFlags)
{
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("msr cpsr_c, %0\n\t"
: : "r" (uFlags));
# else
# error "Unsupported compiler"
# endif
}
#endif
#endif
/**
* Gets the content of the CNTVCT_EL0 (or CNTPCT) register.
*
* @returns CNTVCT_EL0 value.
* @note We call this TSC to better fit in with existing x86/amd64 based code.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(uint64_t) ASMReadTSC(void);
#else
DECLINLINE(uint64_t) ASMReadTSC(void)
{
# if RT_INLINE_ASM_GNU_STYLE
uint64_t u64;
# ifdef RT_ARCH_ARM64
__asm__ __volatile__("isb\n\t"
"mrs %0, CNTVCT_EL0\n\t"
: "=r" (u64));
# else
uint32_t u32Spill;
uint32_t u32Comp;
__asm__ __volatile__("isb\n"
"Lagain:\n\t"
"mrrc p15, 0, %[uSpill], %H[uRet], c14\n\t" /* CNTPCT high into uRet.hi */
"mrrc p15, 0, %[uRet], %[uSpill], c14\n\t" /* CNTPCT low into uRet.lo */
"mrrc p15, 0, %[uSpill], %[uHiComp], c14\n\t" /* CNTPCT high into uHiComp */
"cmp %H[uRet], %[uHiComp]\n\t"
"b.eq Lagain\n\t" /* Redo if high value changed. */
: [uRet] "=r" (u64)
, "=r" (uHiComp)
, "=r" (uSpill));
# endif
return u64;
# else
# error "Unsupported compiler"
# endif
}
#endif
#if 0 /* port to arm64, armv7 and check */
/**
* Enables interrupts (IRQ and FIQ).
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(void) ASMIntEnable(void);
#else
DECLINLINE(void) ASMIntEnable(void)
{
RTCCUINTREG uFlags;
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("mrs %0, cpsr\n\t"
"bic %0, %0, #0xc0\n\t"
"msr cpsr_c, %0\n\t"
: "=r" (uFlags));
# else
# error "Unsupported compiler"
# endif
}
#endif
/**
* Disables interrupts (IRQ and FIQ).
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(void) ASMIntDisable(void);
#else
DECLINLINE(void) ASMIntDisable(void)
{
RTCCUINTREG uFlags;
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("mrs %0, cpsr\n\t"
"orr %0, %0, #0xc0\n\t"
"msr cpsr_c, %0\n\t"
: "=r" (uFlags));
# else
# error "Unsupported compiler"
# endif
}
#endif
/**
* Disables interrupts and returns previous uFLAGS.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(RTCCUINTREG) ASMIntDisableFlags(void);
#else
DECLINLINE(RTCCUINTREG) ASMIntDisableFlags(void)
{
RTCCUINTREG uFlags;
# if RT_INLINE_ASM_GNU_STYLE
RTCCUINTREG uNewFlags;
__asm__ __volatile__("mrs %0, cpsr\n\t"
"orr %1, %0, #0xc0\n\t"
"msr cpsr_c, %1\n\t"
: "=r" (uFlags)
, "=r" (uNewFlags));
# else
# error "Unsupported compiler"
# endif
return uFlags;
}
#endif
/**
* Are interrupts enabled?
*
* @returns true / false.
*/
DECLINLINE(bool) ASMIntAreEnabled(void)
{
/** @todo r=bird: reversed, but does both need to be enabled? */
return ASMGetFlags() & 0xc0 /* IRQ and FIQ bits */ ? true : false;
}
#endif
/**
* Halts the CPU until interrupted.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(void) ASMHalt(void);
#else
DECLINLINE(void) ASMHalt(void)
{
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__ ("wfi\n\t"); /* wait for interrupt */
# else
# error "Unsupported compiler"
# endif
}
#endif
#if 0
/**
* Gets the CPU ID of the current CPU.
*
* @returns the CPU ID.
* @note the name of this method is a bit misleading but serves the purpose
* and prevents #ifdef orgies in other places.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(uint8_t) ASMGetApicId(void);
#else
DECLINLINE(uint8_t) ASMGetApicId(void)
{
# if RT_INLINE_ASM_GNU_STYLE
RTCCUINTREG uCpuId;
__asm__ ("mrc p15, 0, %0, c0, c0, 5\n\t" /* CPU ID Register, privileged */
: "=r" (uCpuId));
return uCpuId;
# else
# error "Unsupported compiler"
# endif
}
#endif
#endif
#if 0
/**
* Invalidate page.
*
* @param pv Address of the page to invalidate.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(void) ASMInvalidatePage(void *pv);
#else
DECLINLINE(void) ASMInvalidatePage(void *pv)
{
# if RT_INLINE_ASM_GNU_STYLE
# else
# error "Unsupported compiler"
# endif
}
#endif
/**
* Write back the internal caches and invalidate them.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(void) ASMWriteBackAndInvalidateCaches(void);
#else
DECLINLINE(void) ASMWriteBackAndInvalidateCaches(void)
{
# if RT_INLINE_ASM_GNU_STYLE
# else
# error "Unsupported compiler"
# endif
}
#endif
/**
* Invalidate internal and (perhaps) external caches without first
* flushing dirty cache lines. Use with extreme care.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(void) ASMInvalidateInternalCaches(void);
#else
DECLINLINE(void) ASMInvalidateInternalCaches(void)
{
# if RT_INLINE_ASM_GNU_STYLE
# else
# error "Unsupported compiler"
# endif
}
#endif
#endif
/** @} */
#endif /* !IPRT_INCLUDED_asm_arm_h */
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