source: mainline/kernel/arch/mips32/include/asm.h@ 0fb70e1

/*
 * Copyright (c) 2003-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup mips32
 * @{
 */
/** @file
 */

#ifndef KERN_mips32_ASM_H_
#define KERN_mips32_ASM_H_

#include <typedefs.h>
#include <config.h>
#include <trace.h>

NO_TRACE static inline void cpu_sleep(void)
{
        /*
         * Unfortunatelly most of the simulators do not support
         *
         * asm volatile (
         *     "wait"
         * );
         *
         */
}

/** Return base address of current stack
 *
 * Return the base address of the current stack.
 * The stack is assumed to be STACK_SIZE bytes long.
 * The stack must start on page boundary.
 *
 */
NO_TRACE static inline uintptr_t get_stack_base(void)
{
        uintptr_t base;
        
        asm volatile (
                "and %[base], $29, %[mask]\n"
                : [base] "=r" (base)
                : [mask] "r" (~(STACK_SIZE - 1))
        );
        
        return base;
}

NO_TRACE static inline void pio_write_8(ioport8_t *port, uint8_t v)
{
        *port = v;
}

NO_TRACE static inline void pio_write_16(ioport16_t *port, uint16_t v)
{
        *port = v;
}

NO_TRACE static inline void pio_write_32(ioport32_t *port, uint32_t v)
{
        *port = v;
}

NO_TRACE static inline uint8_t pio_read_8(ioport8_t *port)
{
        return *port;
}

NO_TRACE static inline uint16_t pio_read_16(ioport16_t *port)
{
        return *port;
}

NO_TRACE static inline uint32_t pio_read_32(ioport32_t *port)
{
        return *port;
}

extern void cpu_halt(void) __attribute__((noreturn));
extern void asm_delay_loop(uint32_t);
extern void userspace_asm(uintptr_t, uintptr_t, uintptr_t);

extern ipl_t interrupts_disable(void);
extern ipl_t interrupts_enable(void);
extern void interrupts_restore(ipl_t);
extern ipl_t interrupts_read(void);
extern bool interrupts_disabled(void);

#endif

/** @}
 */