/*
* 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.
*/
/** @addtogroup ia32
* @{
*/
/** @file
*/
#ifndef KERN_ia32_ASM_H_
#define KERN_ia32_ASM_H_
#include <arch/pm.h>
#include <arch/types.h>
#include <config.h>
extern uint32_t 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(uint32_t t);
extern void asm_fake_loop(uint32_t t);
/** Halt CPU
*
* Halt the current CPU until interrupt event.
*/
static inline void cpu_halt(void)
{
asm volatile ("hlt\n");
}
static inline void cpu_sleep(void)
{
asm volatile ("hlt\n");
}
#define GEN_READ_REG(reg) static inline unative_t read_ ##reg (void) \
{ \
unative_t res; \
asm volatile ("movl %%" #reg ", %0" : "=r" (res) ); \
return res; \
}
#define GEN_WRITE_REG(reg) static inline void write_ ##reg (unative_t 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(uint16_t port, uint8_t 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(uint16_t port, uint16_t 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(uint16_t port, uint32_t 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 uint8_t inb(uint16_t port)
{
uint8_t 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 uint16_t inw(uint16_t port)
{
uint16_t 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 uint32_t inl(uint16_t port)
{
uint32_t 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;
}
/** Write to MSR */
static inline void write_msr(uint32_t msr, uint64_t value)
{
asm volatile ("wrmsr" : : "c" (msr), "a" ((uint32_t)(value)),
"d" ((uint32_t)(value >> 32)));
}
static inline uint64_t read_msr(uint32_t msr)
{
uint32_t ax, dx;
asm volatile ("rdmsr" : "=a"(ax), "=d"(dx) : "c" (msr));
return ((uint64_t)dx << 32) | ax;
}
/** 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 uintptr_t get_stack_base(void)
{
uintptr_t v;
asm volatile (
"andl %%esp, %0\n"
: "=r" (v)
: "0" (~(STACK_SIZE - 1))
);
return v;
}
/** Return current IP address */
static inline uintptr_t * get_ip()
{
uintptr_t *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(uintptr_t addr)
{
asm volatile ("invlpg %0\n" :: "m" (*(unative_t *)addr));
}
/** Load GDTR register from memory.
*
* @param gdtr_reg Address of memory from where to load GDTR.
*/
static inline void gdtr_load(ptr_16_32_t *gdtr_reg)
{
asm volatile ("lgdtl %0\n" : : "m" (*gdtr_reg));
}
/** Store GDTR register to memory.
*
* @param gdtr_reg Address of memory to where to load GDTR.
*/
static inline void gdtr_store(ptr_16_32_t *gdtr_reg)
{
asm volatile ("sgdtl %0\n" : : "m" (*gdtr_reg));
}
/** Load IDTR register from memory.
*
* @param idtr_reg Address of memory from where to load IDTR.
*/
static inline void idtr_load(ptr_16_32_t *idtr_reg)
{
asm volatile ("lidtl %0\n" : : "m" (*idtr_reg));
}
/** Load TR from descriptor table.
*
* @param sel Selector specifying descriptor of TSS segment.
*/
static inline void tr_load(uint16_t sel)
{
asm volatile ("ltr %0" : : "r" (sel));
}
#endif
/** @}
*/