/*
* 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/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);
/** Halt CPU
*
* Halt the current CPU until interrupt event.
*/
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);
/** Byte to port
*
* Output byte to port
*
* @param port Port to write to
* @param val Value to write
*/
static inline void outb(__u16 port, __u8 val) { __asm__ volatile ("outb %b0, %w1\n" : : "a" (val), "d" (port) ); }
/** Word to port
*
* Output word to port
*
* @param port Port to write to
* @param val Value to write
*/
static inline void outw(__u16 port, __u16 val) { __asm__ volatile ("outw %w0, %w1\n" : : "a" (val), "d" (port) ); }
/** Double word to port
*
* Output double word to port
*
* @param port Port to write to
* @param val Value to write
*/
static inline void outl(__u16 port, __u32 val) { __asm__ volatile ("outl %l0, %w1\n" : : "a" (val), "d" (port) ); }
/** Byte from port
*
* Get byte from port
*
* @param port Port to read from
* @return Value read
*/
static inline __u8 inb(__u16 port) { __u8 val; __asm__ volatile ("inb %w1, %b0 \n" : "=a" (val) : "d" (port) ); return val; }
/** Word from port
*
* Get word from port
*
* @param port Port to read from
* @return Value read
*/
static inline __u16 inw(__u16 port) { __u16 val; __asm__ volatile ("inw %w1, %w0 \n" : "=a" (val) : "d" (port) ); return val; }
/** Double word from port
*
* Get double word from port
*
* @param port Port to read from
* @return Value read
*/
static inline __u32 inl(__u16 port) { __u32 val; __asm__ volatile ("inl %w1, %l0 \n" : "=a" (val) : "d" (port) ); return val; }
/** Enable interrupts.
*
* Enable interrupts and return previous
* value of EFLAGS.
*
* @return Old interrupt priority level.
*/
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;
}
/** Disable interrupts.
*
* Disable interrupts and return previous
* value of EFLAGS.
*
* @return Old interrupt priority level.
*/
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;
}
/** Restore interrupt priority level.
*
* Restore EFLAGS.
*
* @param ipl Saved interrupt priority level.
*/
static inline void interrupts_restore(ipl_t ipl)
{
__asm__ volatile (
"pushl %0\n\t"
"popf\n"
: : "r" (ipl)
);
}
/** Return interrupt priority level.
*
* @return EFLAFS.
*/
static inline ipl_t interrupts_read(void)
{
ipl_t v;
__asm__ volatile (
"pushf\n\t"
"popl %0\n"
: "=r" (v)
);
return v;
}
/** 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.
*/
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;
}
/** Return current IP address */
static inline __address * get_ip()
{
__address *ip;
__asm__ volatile (
"mov %%eip, %0"
: "=r" (ip)
);
return ip;
}
/** Invalidate TLB Entry.
*
* @param addr Address on a page whose TLB entry is to be invalidated.
*/
static inline void invlpg(__address addr)
{
__asm__ volatile ("invlpg %0\n" :: "m" (*(__native *)addr));
}
#endif