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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* kprintf.cc — Kernel formatted output
*
* Uses mpaland/printf's vsnprintf_ as the core formatting engine.
*
* Architecture:
* vsnprintf_() ← pure formatting, writes to buffer
* ↓
* kprintf() ← format + emit via console_write_all()
* kvprintf() ← va_list variant
* ksnprintf() ← format into caller's buffer
*
* Output path:
* Pre-registration: console_write_all() → early_putc() fallback
* Post-registration: console_write_all() → struct console chain
*/
#include <lume/kprintf.h>
#include <lume/console.h>
#include <lume/atomic.h>
#include <arch/cpu.h>
#include "printf.h"
/* ------------------------------------------------------------------ */
/* Console spinlock (raw, no scheduler dependency — safe in panic) */
/* ------------------------------------------------------------------ */
static lume::atomic<uint32> g_console_lock{0};
static inline void console_lock_acquire()
{
while (g_console_lock.exchange(1, __ATOMIC_ACQUIRE) != 0) {
/* spin */
}
}
static inline void console_lock_release()
{
g_console_lock.store(0, __ATOMIC_RELEASE);
}
/* ------------------------------------------------------------------ */
/* _putchar: required by mpaland/printf for printf_() / vprintf_() */
/* ------------------------------------------------------------------ */
void _putchar(char character)
{
early_putc(character);
}
/* ------------------------------------------------------------------ */
/* Public API */
/* ------------------------------------------------------------------ */
extern "C" int kprintf(const char* fmt, ...)
{
char buf[256];
va_list va;
va_start(va, fmt);
int len = vsnprintf_(buf, sizeof(buf), fmt, va);
va_end(va);
/* Emit to console under lock */
console_lock_acquire();
console_write_all(buf, len);
console_lock_release();
return len;
}
extern "C" int kvprintf(const char* fmt, va_list va)
{
char buf[256];
int len = vsnprintf_(buf, sizeof(buf), fmt, va);
console_lock_acquire();
console_write_all(buf, len);
console_lock_release();
return len;
}
extern "C" int ksnprintf(char* buf, int count, const char* fmt, ...)
{
va_list va;
va_start(va, fmt);
int ret = vsnprintf_(buf, (size_t)count, fmt, va);
va_end(va);
return ret;
}
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