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nuttx/arch/arm64/include/irq.h
Ville Juven 29f8648ecc arm64: Initial implementation of CONFIG_BUILD_KERNEL 
This is the initial version for kernel mode build on the arm64 platform.
It works much in the same way as the risc-v implementation so any
highlights can be read from there.

Features that have been tested working:
- Creating address environments
- Loading init (nsh) from elf file
- Booting to nsh
- Starting other processes from nsh
- ostest runs to completion

Features that are not tested / do not work:
- SHM / shared memory support
- Kernel memory mapping (MM_KMAP)
- fork/vfork

An example qemu target is provided as a separate patch:
tools/configure.sh qemu-armv8a:knsh
2024-08-23 10:26:34 -03:00

450 lines
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/****************************************************************************
* arch/arm64/include/irq.h
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/* This file should never be included directly but, rather, only indirectly
* through nuttx/irq.h
*/
#ifndef __ARCH_ARM64_INCLUDE_IRQ_H
#define __ARCH_ARM64_INCLUDE_IRQ_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#ifndef __ASSEMBLY__
# include <stdint.h>
#endif
/* Include NuttX-specific IRQ definitions */
#include <nuttx/irq.h>
/* Include chip-specific IRQ definitions (including IRQ numbers) */
#include <arch/chip/irq.h>
/****************************************************************************
* Pre-processor Prototypes
****************************************************************************/
#define up_getsp() (uintptr_t)__builtin_frame_address(0)
/* MPIDR_EL1, Multiprocessor Affinity Register */
#define MPIDR_AFFLVL_MASK (0xff)
#define MPIDR_AFF0_SHIFT (0)
#define MPIDR_AFF1_SHIFT (8)
#define MPIDR_AFF2_SHIFT (16)
#define MPIDR_AFF3_SHIFT (32)
/* mpidr_el1 register, the register is define:
* - bit 0~7: Aff0
* - bit 8~15: Aff1
* - bit 16~23: Aff2
* - bit 24: MT, multithreading
* - bit 25~29: RES0
* - bit 30: U, multiprocessor/Uniprocessor
* - bit 31: RES1
* - bit 32~39: Aff3
* - bit 40~63: RES0
* Different ARM64 Core will use different Affn define, the mpidr_el1
* value is not CPU number, So we need to change CPU number to mpid
* and vice versa
*/
#define GET_MPIDR() \
({ \
uint64_t __val; \
__asm__ volatile ("mrs %0, mpidr_el1" \
: "=r" (__val) :: "memory"); \
__val; \
})
/****************************************************************************
* Exception stack frame format:
*
* x0 ~ x18, x30 (lr), spsr and elr
* Corruptible Registers and exception context
* reference to Armv8-A Instruction Set Architecture
* (ARM062-948681440-3280, Issue 1.1), chapter 11 PCS
* need to be saved in all exception
*
* x19 ~ x29, sp_el0, sp_elx
* Callee-saved Registers and SP pointer
* reference to Armv8-A Instruction Set Architecture
* (ARM062-948681440-3280, Issue 1.1), chapter 11 PCS
* These registers frame is allocated on stack frame
* when a exception is occurred and saved at task switch
* or crash exception
* check arm64_vectors.S for detail
*
****************************************************************************/
/****************************************************************************
* Registers and exception context
* Note:
* REG_EXEC_DEPTH indicate the task's exception depth
*
****************************************************************************/
#define REG_X0 (0)
#define REG_X1 (1)
#define REG_X2 (2)
#define REG_X3 (3)
#define REG_X4 (4)
#define REG_X5 (5)
#define REG_X6 (6)
#define REG_X7 (7)
#define REG_X8 (8)
#define REG_X9 (9)
#define REG_X10 (10)
#define REG_X11 (11)
#define REG_X12 (12)
#define REG_X13 (13)
#define REG_X14 (14)
#define REG_X15 (15)
#define REG_X16 (16)
#define REG_X17 (17)
#define REG_X18 (18)
#define REG_X19 (19)
#define REG_X20 (20)
#define REG_X21 (21)
#define REG_X22 (22)
#define REG_X23 (23)
#define REG_X24 (24)
#define REG_X25 (25)
#define REG_X26 (26)
#define REG_X27 (27)
#define REG_X28 (28)
#define REG_X29 (29)
#define REG_X30 (30)
#define REG_SP_ELX (31)
#define REG_ELR (32)
#define REG_SPSR (33)
#define REG_SP_EL0 (34)
#define REG_EXE_DEPTH (35)
#define REG_TPIDR_EL0 (36)
#define REG_TPIDR_EL1 (37)
/* In Armv8-A Architecture, the stack must align with 16 byte */
#define XCPTCONTEXT_GP_REGS (38)
#define XCPTCONTEXT_GP_SIZE (8 * XCPTCONTEXT_GP_REGS)
#ifdef CONFIG_ARCH_FPU
/****************************************************************************
* q0 ~ q31(128bit), fpsr, fpcr
* armv8 fpu registers and context
* With CONFIG_ARCH_FPU is enabled, armv8 fpu registers context
* is allocated on stack frame at exception and store/restore
* when switching FPU context
* check arm64_fpu.c for detail
*
****************************************************************************/
/* 128bit registers */
#define FPU_REG_Q0 (0)
#define FPU_REG_Q1 (1)
#define FPU_REG_Q2 (2)
#define FPU_REG_Q3 (3)
#define FPU_REG_Q4 (4)
#define FPU_REG_Q5 (5)
#define FPU_REG_Q6 (6)
#define FPU_REG_Q7 (7)
#define FPU_REG_Q8 (8)
#define FPU_REG_Q9 (9)
#define FPU_REG_Q10 (10)
#define FPU_REG_Q11 (11)
#define FPU_REG_Q12 (12)
#define FPU_REG_Q13 (13)
#define FPU_REG_Q14 (14)
#define FPU_REG_Q15 (15)
#define FPU_REG_Q16 (16)
#define FPU_REG_Q17 (17)
#define FPU_REG_Q18 (18)
#define FPU_REG_Q19 (19)
#define FPU_REG_Q20 (20)
#define FPU_REG_Q21 (21)
#define FPU_REG_Q22 (22)
#define FPU_REG_Q23 (23)
#define FPU_REG_Q24 (24)
#define FPU_REG_Q25 (25)
#define FPU_REG_Q26 (26)
#define FPU_REG_Q27 (27)
#define FPU_REG_Q28 (28)
#define FPU_REG_Q29 (29)
#define FPU_REG_Q30 (30)
#define FPU_REG_Q31 (31)
/* 32 bit registers
*/
#define FPU_REG_FPSR (0)
#define FPU_REG_FPCR (1)
/* FPU registers(Q0~Q31, 128bit): 32x2 = 64
* FPU FPSR/SPSR(32 bit) : 1
* FPU TRAP: 1
* 64 + 1 + 1 = 66
*/
#define XCPTCONTEXT_FPU_REGS (66)
#else
#define XCPTCONTEXT_FPU_REGS (0)
#endif
#define FPUCONTEXT_SIZE (8 * XCPTCONTEXT_FPU_REGS)
#define XCPTCONTEXT_REGS (XCPTCONTEXT_GP_REGS + XCPTCONTEXT_FPU_REGS)
#define XCPTCONTEXT_SIZE (8 * XCPTCONTEXT_REGS)
#ifndef __ASSEMBLY__
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/****************************************************************************
* Public Data
****************************************************************************/
/* g_current_regs[] holds a references to the current interrupt level
* register storage structure. It is non-NULL only during interrupt
* processing. Access to g_current_regs[] must be through the macro
* CURRENT_REGS for portability.
*/
/* For the case of architectures with multiple CPUs, then there must be one
* such value for each processor that can receive an interrupt.
*/
EXTERN volatile uint64_t *g_current_regs[CONFIG_SMP_NCPUS];
#define CURRENT_REGS (g_current_regs[up_cpu_index()])
/****************************************************************************
* Public Types
****************************************************************************/
#ifndef __ASSEMBLY__
struct xcptcontext
{
/* The following function pointer is non-zero if there are pending signals
* to be processed.
*/
void *sigdeliver; /* Actual type is sig_deliver_t */
#ifdef CONFIG_BUILD_KERNEL
/* This is the saved address to use when returning from a user-space
* signal handler.
*/
uintptr_t sigreturn;
#endif
/* task stack reg context */
uint64_t *regs;
/* task context, for signal process */
uint64_t *saved_reg;
#ifdef CONFIG_ARCH_FPU
uint64_t *fpu_regs;
uint64_t *saved_fpu_regs;
#endif
/* Extra fault address register saved for common paging logic. In the
* case of the pre-fetch abort, this value is the same as regs[REG_ELR];
* For the case of the data abort, this value is the value of the fault
* address register (FAR) at the time of data abort exception.
*/
#ifdef CONFIG_LEGACY_PAGING
uintptr_t far;
#endif
#ifdef CONFIG_ARCH_ADDRENV
# ifdef CONFIG_ARCH_STACK_DYNAMIC
/* This array holds the physical address of the level 2 page table used
* to map the thread's stack memory. This array will be initially of
* zeroed and would be back-up up with pages during page fault exception
* handling to support dynamically sized stacks for each thread.
*/
uintptr_t *ustack[ARCH_STACK_NSECTS];
# endif
# ifdef CONFIG_ARCH_KERNEL_STACK
/* In this configuration, all syscalls execute from an internal kernel
* stack. Why? Because when we instantiate and initialize the address
* environment of the new user process, we will temporarily lose the
* address environment of the old user process, including its stack
* contents. The kernel C logic will crash immediately with no valid
* stack in place.
*/
uintptr_t *ustkptr; /* Saved user stack pointer */
uintptr_t *kstack; /* Allocate base of the (aligned) kernel stack */
# endif
#endif
};
#endif /* __ASSEMBLY__ */
/* Name: up_irq_save, up_irq_restore, and friends.
*
* NOTE: This function should never be called from application code and,
* as a general rule unless you really know what you are doing, this
* function should not be called directly from operation system code either:
* Typically, the wrapper functions, enter_critical_section() and
* leave_critical section(), are probably what you really want.
*/
/* Return the current IRQ state */
static inline irqstate_t irqstate(void)
{
irqstate_t flags;
__asm__ __volatile__("mrs %0, daif" : "=r" (flags):: "memory");
return flags;
}
/* Disable IRQs and return the previous IRQ state */
static inline irqstate_t up_irq_save(void)
{
irqstate_t flags;
__asm__ __volatile__
(
"mrs %0, daif\n"
#ifdef CONFIG_ARM64_DECODEFIQ
"msr daifset, #3\n"
#else
"msr daifset, #2\n"
#endif
: "=r" (flags)
:
: "memory"
);
return flags;
}
/* Enable IRQs and return the previous IRQ state */
static inline irqstate_t up_irq_enable(void)
{
irqstate_t flags;
__asm__ __volatile__
(
"mrs %0, daif\n"
#ifdef CONFIG_ARM64_DECODEFIQ
"msr daifclr, #3\n"
#else
"msr daifclr, #2\n"
#endif
: "=r" (flags)
:
: "memory"
);
return flags;
}
/* Restore saved IRQ & FIQ state */
static inline void up_irq_restore(irqstate_t flags)
{
__asm__ __volatile__("msr daif, %0" :: "r" (flags): "memory");
}
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: up_cpu_index
*
* Description:
* Return an index in the range of 0 through (CONFIG_SMP_NCPUS-1) that
* corresponds to the currently executing CPU.
*
* Input Parameters:
* None
*
* Returned Value:
* An integer index in the range of 0 through (CONFIG_SMP_NCPUS-1) that
* corresponds to the currently executing CPU.
*
****************************************************************************/
#ifdef CONFIG_SMP
# define up_cpu_index() ((int)MPID_TO_CORE(GET_MPIDR()))
#else
# define up_cpu_index() (0)
#endif
/****************************************************************************
* Name: up_interrupt_context
*
* Description: Return true is we are currently executing in
* the interrupt handler context.
*
****************************************************************************/
static inline bool up_interrupt_context(void)
{
#ifdef CONFIG_SMP
irqstate_t flags = up_irq_save();
#endif
bool ret = (CURRENT_REGS != NULL);
#ifdef CONFIG_SMP
up_irq_restore(flags);
#endif
return ret;
}
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __ASSEMBLY__ */
#endif /* __ARCH_ARM64_INCLUDE_IRQ_H */
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