You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
/* Copyright (C) 2021,2022 fef <owo@fef.moe>. All rights reserved. */
|
|
|
|
#pragma once
|
|
|
|
#include <arch/cpufunc.h>
|
|
#include <arch/trap.h>
|
|
|
|
#include <gay/cdefs.h>
|
|
#include <gay/irq.h>
|
|
#include <gay/sched.h>
|
|
#include <gay/types.h>
|
|
|
|
/**
|
|
* @brief Print an error message and halt the system immediately.
|
|
*
|
|
* @param fmt printf style format string
|
|
*/
|
|
void panic(const char *fmt, ...) __noreturn __printflike(1, 2);
|
|
#define panic_if(condition, msg, ...) do { \
|
|
if (__predict_false(condition)) \
|
|
panic(msg, ##__VA_ARGS__); \
|
|
} while (0)
|
|
|
|
void print_regs(const trap_frame_t *ctx);
|
|
|
|
#ifdef DEBUG
|
|
/**
|
|
* @brief Assert that statement `x` is true.
|
|
* If it is not and debugging is enabled, the kernel panics.
|
|
*/
|
|
#define KASSERT(x) do { \
|
|
if ( __predict_false(!(x)) ) { \
|
|
panic("Assertion \"%s\" failed!\n" \
|
|
" in function %s()\n" \
|
|
" in file %s, line %u\n", \
|
|
#x, __func__, __FILENAME__, __LINE__); \
|
|
} \
|
|
} while (0)
|
|
#else
|
|
#define KASSERT(x) do { } while (0)
|
|
#endif
|
|
|
|
/**
|
|
* @brief Enter a critical section, meaning preemption gets disabled.
|
|
* Critical sections should be kept as short as possible for performance.
|
|
* Cannot be called from irq context because irqs always run atomically.
|
|
*
|
|
* @see `critical_leave()`
|
|
*/
|
|
static inline void critical_enter(void)
|
|
{
|
|
KASSERT(!in_irq());
|
|
|
|
struct task *tsk = current;
|
|
tsk->critnest++;
|
|
}
|
|
|
|
/**
|
|
* @brief Leave a critical section.
|
|
* Cannot be called from irq context.
|
|
*
|
|
* @see `critical_enter()`
|
|
*/
|
|
static inline void critical_leave(void)
|
|
{
|
|
KASSERT(!in_irq());
|
|
|
|
struct task *tsk = current;
|
|
tsk->critnest--;
|
|
|
|
KASSERT(tsk->critnest >= 0);
|
|
}
|
|
|
|
static inline bool in_critical(void)
|
|
{
|
|
if (in_irq() || !intr_enabled())
|
|
return true;
|
|
return current->critnest > 0;
|
|
}
|