arch.h

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/*
 * Copyright (c) 2010-2014 Wind River Systems, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_ARCH_X86_IA32_ARCH_H_
#define ZEPHYR_INCLUDE_ARCH_X86_IA32_ARCH_H_
 
#include "sys_io.h"
#include <stdbool.h>
#include <zephyr/kernel_structs.h>
#include <zephyr/arch/common/ffs.h>
#include <zephyr/sys/util.h>
#include <zephyr/arch/exception.h>
#include <zephyr/arch/x86/ia32/gdbstub.h>
#include <zephyr/arch/x86/ia32/thread.h>
#include <zephyr/arch/x86/ia32/syscall.h>
 
#ifndef _ASMLANGUAGE
#include <stddef.h>     /* for size_t */
 
#include <zephyr/arch/common/addr_types.h>
#include <zephyr/arch/x86/ia32/segmentation.h>
#include <zephyr/pm/pm.h>
 
#endif /* _ASMLANGUAGE */
 
/* GDT layout */
#define CODE_SEG        0x08
#define DATA_SEG        0x10
#define MAIN_TSS        0x18
#define DF_TSS          0x20
 
/*
 * Use for thread local storage.
 * Match these to gen_gdt.py.
 * The 0x03 is added to limit privilege.
 */
#if defined(CONFIG_USERSPACE)
#define GS_TLS_SEG      (0x38 | 0x03)
#elif defined(CONFIG_X86_STACK_PROTECTION)
#define GS_TLS_SEG      (0x28 | 0x03)
#else
#define GS_TLS_SEG      (0x18 | 0x03)
#endif
 
#define MK_ISR_NAME(x) __isr__##x
 
#define Z_DYN_STUB_SIZE                 8
#define Z_DYN_STUB_OFFSET               0
#define Z_DYN_STUB_LONG_JMP_EXTRA_SIZE  3
#define Z_DYN_STUB_PER_BLOCK            32
 
 
#ifndef _ASMLANGUAGE
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* interrupt/exception/error related definitions */
 
typedef struct s_isrList {
        void            *fnc;
        unsigned int    irq;
        unsigned int    priority;
        unsigned int    vec;
        unsigned int    dpl;
 
        unsigned int    tss;
} ISR_LIST;
 
 
#define NANO_CPU_INT_REGISTER(r, n, p, v, d) \
         static ISR_LIST __attribute__((section(".intList"))) \
                         __attribute__((used)) MK_ISR_NAME(r) = \
                        { \
                                .fnc = &(r), \
                                .irq = (n), \
                                .priority = (p), \
                                .vec = (v), \
                                .dpl = (d), \
                                .tss = 0 \
                        }
 
#define _X86_IDT_TSS_REGISTER(tss_p, irq_p, priority_p, vec_p, dpl_p) \
        static ISR_LIST __attribute__((section(".intList"))) \
                        __attribute__((used)) MK_ISR_NAME(vec_p) = \
                        { \
                                .fnc = NULL, \
                                .irq = (irq_p), \
                                .priority = (priority_p), \
                                .vec = (vec_p), \
                                .dpl = (dpl_p), \
                                .tss = (tss_p) \
                        }
 
#define _VECTOR_ARG(irq_p)      (-1)
 
#ifdef CONFIG_LINKER_USE_PINNED_SECTION
#define IRQSTUBS_TEXT_SECTION   ".pinned_text.irqstubs"
#else
#define IRQSTUBS_TEXT_SECTION   ".text.irqstubs"
#endif
 
/* Internally this function does a few things:
 *
 * 1. There is a declaration of the interrupt parameters in the .intList
 * section, used by gen_idt to create the IDT. This does the same thing
 * as the NANO_CPU_INT_REGISTER() macro, but is done in assembly as we
 * need to populate the .fnc member with the address of the assembly
 * IRQ stub that we generate immediately afterwards.
 *
 * 2. The IRQ stub itself is declared. The code will go in its own named
 * section .text.irqstubs section (which eventually gets linked into 'text')
 * and the stub shall be named (isr_name)_irq(irq_line)_stub
 *
 * 3. The IRQ stub pushes the ISR routine and its argument onto the stack
 * and then jumps to the common interrupt handling code in _interrupt_enter().
 *
 * 4. z_irq_controller_irq_config() is called at runtime to set the mapping
 * between the vector and the IRQ line as well as triggering flags
 */
#define ARCH_IRQ_CONNECT(irq_p, priority_p, isr_p, isr_param_p, flags_p) \
{ \
        __asm__ __volatile__(                                                   \
                ".pushsection .intList\n\t" \
                ".long %c[isr]_irq%c[irq]_stub\n\t"     /* ISR_LIST.fnc */ \
                ".long %c[irq]\n\t"             /* ISR_LIST.irq */ \
                ".long %c[priority]\n\t"        /* ISR_LIST.priority */ \
                ".long %c[vector]\n\t"          /* ISR_LIST.vec */ \
                ".long 0\n\t"                   /* ISR_LIST.dpl */ \
                ".long 0\n\t"                   /* ISR_LIST.tss */ \
                ".popsection\n\t" \
                ".pushsection " IRQSTUBS_TEXT_SECTION "\n\t" \
                ".global %c[isr]_irq%c[irq]_stub\n\t" \
                "%c[isr]_irq%c[irq]_stub:\n\t" \
                "endbr32\n\t" \
                "pushl %[isr_param]\n\t" \
                "pushl %[isr]\n\t" \
                "jmp _interrupt_enter\n\t" \
                ".popsection\n\t" \
                : \
                : [isr] "i" (isr_p), \
                  [isr_param] "i" (isr_param_p), \
                  [priority] "i" (priority_p), \
                  [vector] "i" _VECTOR_ARG(irq_p), \
                  [irq] "i" (irq_p)); \
        z_irq_controller_irq_config(Z_IRQ_TO_INTERRUPT_VECTOR(irq_p), (irq_p), \
                                   (flags_p)); \
}
 
#ifdef CONFIG_PCIE
 
#define ARCH_PCIE_IRQ_CONNECT(bdf_p, irq_p, priority_p,                 \
                              isr_p, isr_param_p, flags_p)              \
        ARCH_IRQ_CONNECT(irq_p, priority_p, isr_p, isr_param_p, flags_p)
 
#endif /* CONFIG_PCIE */
 
/* Direct interrupts won't work as expected with KPTI turned on, because
 * all non-user accessible pages in the page table are marked non-present.
 * It's likely possible to add logic to ARCH_ISR_DIRECT_HEADER/FOOTER to do
 * the necessary trampolining to switch page tables / stacks, but this
 * probably loses all the latency benefits that direct interrupts provide
 * and one might as well use a regular interrupt anyway.
 */
#ifndef CONFIG_X86_KPTI
#define ARCH_IRQ_DIRECT_CONNECT(irq_p, priority_p, isr_p, flags_p) \
{ \
        NANO_CPU_INT_REGISTER(isr_p, irq_p, priority_p, -1, 0); \
        z_irq_controller_irq_config(Z_IRQ_TO_INTERRUPT_VECTOR(irq_p), (irq_p), \
                                   (flags_p)); \
}
 
#ifdef CONFIG_PM
static inline void arch_irq_direct_pm(void)
{
        if (_kernel.idle) {
                _kernel.idle = 0;
                pm_system_resume();
        }
}
 
#define ARCH_ISR_DIRECT_PM() arch_irq_direct_pm()
#else
#define ARCH_ISR_DIRECT_PM() do { } while (false)
#endif
 
#define ARCH_ISR_DIRECT_HEADER() arch_isr_direct_header()
#define ARCH_ISR_DIRECT_FOOTER(swap) arch_isr_direct_footer(swap)
 
/* FIXME:
 * tracing/tracing.h cannot be included here due to circular dependency
 */
#if defined(CONFIG_TRACING)
void sys_trace_isr_enter(void);
void sys_trace_isr_exit(void);
#endif
 
static inline void arch_isr_direct_header(void)
{
#if defined(CONFIG_TRACING)
        sys_trace_isr_enter();
#endif
 
        /* We're not going to unlock IRQs, but we still need to increment this
         * so that arch_is_in_isr() works
         */
        ++_kernel.cpus[0].nested;
}
 
/*
 * FIXME: z_swap_irqlock is an inline function declared in a private header and
 *        cannot be referenced from a public header, so we move it to an
 *        external function.
 */
void arch_isr_direct_footer_swap(unsigned int key);
 
static inline void arch_isr_direct_footer(int swap)
{
        z_irq_controller_eoi();
#if defined(CONFIG_TRACING)
        sys_trace_isr_exit();
#endif
        --_kernel.cpus[0].nested;
 
        /* Call swap if all the following is true:
         *
         * 1) swap argument was enabled to this function
         * 2) We are not in a nested interrupt
         * 3) Next thread to run in the ready queue is not this thread
         */
        if (swap != 0 && _kernel.cpus[0].nested == 0 &&
            _kernel.ready_q.cache != _current) {
                unsigned int flags;
 
                /* Fetch EFLAGS argument to z_swap() */
                __asm__ volatile (
                        "pushfl\n\t"
                        "popl %0\n\t"
                        : "=g" (flags)
                        :
                        : "memory"
                        );
 
                arch_isr_direct_footer_swap(flags);
        }
}
 
#define ARCH_ISR_DIRECT_DECLARE(name) \
        static inline int name##_body(void); \
        __attribute__ ((interrupt)) void name(void *stack_frame) \
        { \
                ARG_UNUSED(stack_frame); \
                int check_reschedule; \
                ISR_DIRECT_HEADER(); \
                check_reschedule = name##_body(); \
                ISR_DIRECT_FOOTER(check_reschedule); \
        } \
        static inline int name##_body(void)
#endif /* !CONFIG_X86_KPTI */
 
static ALWAYS_INLINE unsigned int arch_irq_lock(void)
{
        unsigned int key;
 
        __asm__ volatile ("pushfl; cli; popl %0" : "=g" (key) :: "memory");
 
        return key;
}
 
 
#define NANO_SOFT_IRQ   ((unsigned int) (-1))
 
#ifdef CONFIG_X86_ENABLE_TSS
extern struct task_state_segment _main_tss;
#endif
 
#define ARCH_EXCEPT(reason_p) do { \
        __asm__ volatile( \
                "push %[reason]\n\t" \
                "int %[vector]\n\t" \
                : \
                : [vector] "i" (Z_X86_OOPS_VECTOR), \
                  [reason] "i" (reason_p) \
                : "memory"); \
        CODE_UNREACHABLE; /* LCOV_EXCL_LINE */ \
} while (false)
 
/*
 * Dynamic thread object memory alignment.
 *
 * If support for SSEx extensions is enabled a 16 byte boundary is required,
 * since the 'fxsave' and 'fxrstor' instructions require this. In all other
 * cases a 4 byte boundary is sufficient.
 */
#if defined(CONFIG_EAGER_FPU_SHARING) || defined(CONFIG_LAZY_FPU_SHARING)
#ifdef CONFIG_SSE
#define ARCH_DYNAMIC_OBJ_K_THREAD_ALIGNMENT     16
#else
#define ARCH_DYNAMIC_OBJ_K_THREAD_ALIGNMENT     (sizeof(void *))
#endif
#else
/* No special alignment requirements, simply align on pointer size. */
#define ARCH_DYNAMIC_OBJ_K_THREAD_ALIGNMENT     (sizeof(void *))
#endif /* CONFIG_*_FP_SHARING */
 
 
#ifdef __cplusplus
}
#endif
 
#endif /* !_ASMLANGUAGE */
 
#endif /* ZEPHYR_INCLUDE_ARCH_X86_IA32_ARCH_H_ */