/*
* Copyright (C) 2005 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.
*/
#ifndef __amd64_ASM_H__
#define __amd64_ASM_H__
#include <arch/types.h>
#include <config.h>
extern void asm_delay_loop(__u32 t);
extern void asm_fake_loop(__u32 t);
/** 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 ("andq %%rsp, %0\n" : "=r" (v) : "0" (~((__u64)STACK_SIZE-1)));
return v;
}
static inline void cpu_sleep(void) { __asm__ volatile ("hlt\n"); };
static inline void cpu_halt(void) { __asm__ volatile ("hlt\n"); };
/** 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; }
/** 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) ); }
/** Swap Hidden part of GS register with visible one */
static inline void swapgs(void) { __asm__ volatile("swapgs"); }
/** 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 (
"pushfq\n"
"popq %0\n"
"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 (
"pushfq\n"
"popq %0\n"
"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 (
"pushq %0\n"
"popfq\n"
: : "r" (ipl)
);
}
/** Return interrupt priority level.
*
* Return EFLAFS.
*
* @return Current interrupt priority level.
*/
static inline ipl_t interrupts_read(void) {
ipl_t v;
__asm__ volatile (
"pushfq\n"
"popq %0\n"
: "=r" (v)
);
return v;
}
/** Read CR0
*
* Return value in CR0
*
* @return Value read.
*/
static inline __u64 read_cr0(void)
{
__u64 v;
__asm__ volatile ("movq %%cr0,%0\n" : "=r" (v));
return v;
}
/** Read CR2
*
* Return value in CR2
*
* @return Value read.
*/
static inline __u64 read_cr2(void)
{
__u64 v;
__asm__ volatile ("movq %%cr2,%0\n" : "=r" (v));
return v;
}
/** Write CR3
*
* Write value to CR3.
*
* @param v Value to be written.
*/
static inline void write_cr3(__u64 v)
{
__asm__ volatile ("movq %0,%%cr3\n" : : "r" (v));
}
/** Read CR3
*
* Return value in CR3
*
* @return Value read.
*/
static inline __u64 read_cr3(void)
{
__u64 v;
__asm__ volatile ("movq %%cr3,%0" : "=r" (v));
return v;
}
/** Write to MSR */
static inline void write_msr(__u32 msr, __u64 value)
{
__asm__ volatile (
"wrmsr;" : : "c" (msr),
"a" ((__u32)(value)),
"d" ((__u32)(value >> 32))
);
}
static inline __native read_msr(__u32 msr)
{
__u32 ax, dx;
__asm__ volatile (
"rdmsr;" : "=a"(ax), "=d"(dx) : "c" (msr)
);
return ((__u64)dx << 32) | ax;
}
/** Enable local APIC
*
* Enable local APIC in MSR.
*/
static inline void enable_l_apic_in_msr()
{
__asm__ volatile (
"movl $0x1b, %%ecx\n"
"rdmsr\n"
"orl $(1<<11),%%eax\n"
"orl $(0xfee00000),%%eax\n"
"wrmsr\n"
:
:
:"%eax","%ecx","%edx"
);
}
static inline __address * get_ip()
{
__address *ip;
__asm__ volatile (
"mov %%rip, %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" (addr));
}
extern size_t interrupt_handler_size;
extern void interrupt_handlers(void);
#endif