asm.h

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/*
 * Copyright (C) 2001-2004 Jakub Jermar
 * Copyright (C) 2005 Sergey Bondari
 * 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.
 */

#ifndef __ia32_ASM_H__
#define __ia32_ASM_H__

#include <arch/pm.h>
#include <arch/types.h>
#include <config.h>

extern __u32 interrupt_handler_size;

extern void paging_on(void);

extern void interrupt_handlers(void);

extern void enable_l_apic_in_msr(void);


extern void asm_delay_loop(__u32 t);
extern void asm_fake_loop(__u32 t);


static inline void cpu_halt(void) { __asm__("hlt\n"); };
static inline void cpu_sleep(void) { __asm__("hlt\n"); };

#define GEN_READ_REG(reg) static inline __native read_ ##reg (void) \
    { \
        __native res; \
        __asm__ volatile ("movl %%" #reg ", %0" : "=r" (res) ); \
        return res; \
    }

#define GEN_WRITE_REG(reg) static inline void write_ ##reg (__native regn) \
    { \
        __asm__ volatile ("movl %0, %%" #reg : : "r" (regn)); \
    }

GEN_READ_REG(cr0);
GEN_READ_REG(cr2);
GEN_READ_REG(cr3);
GEN_WRITE_REG(cr3);

GEN_READ_REG(dr0);
GEN_READ_REG(dr1);
GEN_READ_REG(dr2);
GEN_READ_REG(dr3);
GEN_READ_REG(dr6);
GEN_READ_REG(dr7);

GEN_WRITE_REG(dr0);
GEN_WRITE_REG(dr1);
GEN_WRITE_REG(dr2);
GEN_WRITE_REG(dr3);
GEN_WRITE_REG(dr6);
GEN_WRITE_REG(dr7);

static inline void outb(__u16 port, __u8 val) { __asm__ volatile ("outb %b0, %w1\n" : : "a" (val), "d" (port) ); }

static inline void outw(__u16 port, __u16 val) { __asm__ volatile ("outw %w0, %w1\n" : : "a" (val), "d" (port) ); }

static inline void outl(__u16 port, __u32 val) { __asm__ volatile ("outl %l0, %w1\n" : : "a" (val), "d" (port) ); }

static inline __u8 inb(__u16 port) { __u8 val; __asm__ volatile ("inb %w1, %b0 \n" : "=a" (val) : "d" (port) ); return val; }

static inline __u16 inw(__u16 port) { __u16 val; __asm__ volatile ("inw %w1, %w0 \n" : "=a" (val) : "d" (port) ); return val; }

static inline __u32 inl(__u16 port) { __u32 val; __asm__ volatile ("inl %w1, %l0 \n" : "=a" (val) : "d" (port) ); return val; }

static inline ipl_t interrupts_enable(void)
{
        ipl_t v;
        __asm__ volatile (
                "pushf\n\t"
                "popl %0\n\t"
                "sti\n"
                : "=r" (v)
        );
        return v;
}

static inline ipl_t interrupts_disable(void)
{
        ipl_t v;
        __asm__ volatile (
                "pushf\n\t"
                "popl %0\n\t"
                "cli\n"
                : "=r" (v)
        );
        return v;
}

static inline void interrupts_restore(ipl_t ipl)
{
        __asm__ volatile (
                "pushl %0\n\t"
                "popf\n"
                : : "r" (ipl)
        );
}

static inline ipl_t interrupts_read(void)
{
        ipl_t v;
        __asm__ volatile (
                "pushf\n\t"
                "popl %0\n"
                : "=r" (v)
        );
        return v;
}

static inline __address get_stack_base(void)
{
        __address v;
        
        __asm__ volatile ("andl %%esp, %0\n" : "=r" (v) : "0" (~(STACK_SIZE-1)));
        
        return v;
}

static inline __u64 rdtsc(void)
{
        __u64 v;
        
        __asm__ volatile("rdtsc\n" : "=A" (v));
        
        return v;
}

static inline __address * get_ip() 
{
        __address *ip;

        __asm__ volatile (
                "mov %%eip, %0"
                : "=r" (ip)
                );
        return ip;
}

static inline void invlpg(__address addr)
{
        __asm__ volatile ("invlpg %0\n" :: "m" (*(__native *)addr));
}

static inline void gdtr_load(ptr_16_32_t *gdtr_reg)
{
        __asm__ volatile ("lgdtl %0\n" : : "m" (*gdtr_reg));
}

static inline void gdtr_store(ptr_16_32_t *gdtr_reg)
{
        __asm__ volatile ("sgdtl %0\n" : : "m" (*gdtr_reg));
}

static inline void idtr_load(ptr_16_32_t *idtr_reg)
{
        __asm__ volatile ("lidtl %0\n" : : "m" (*idtr_reg));
}

static inline void tr_load(__u16 sel)
{
        __asm__ volatile ("ltr %0" : : "r" (sel));
}

#endif

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