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locore.h
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locore.h
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#ifndef _MACH_LOCORE_H
#define _MACH_LOCORE_H
/*
* locore.h
* Inlined i386 processor specific functions
*
* Note that the "\n" and "\t" terminators at the end of the assembly
* opcodes are simply there to prettify the assembly output from the
* compiler - if you compile using gcc and use the "-S" switch you'll
* see what I mean :-)
*/
#include <mach/setjmp.h>
#include <mach/machreg.h>
#include <mach/vm.h>
#include <sys/percpu.h>
#include <sys/thread.h>
extern int cpfail(void);
extern unsigned char id_stack[];
/*
* set_cr0()
* Set the value of the processor config register cr0
*/
inline extern void
set_cr0(ulong addr)
{
__asm__ __volatile__(
"movl %0, %%cr0\n\t"
: /* No output */
: "r" (addr));
}
/*
* set_cr3()
* Set the value of the processor config register cr3 - the L1 page
* table pointer
*/
inline extern void
set_cr3(ulong addr)
{
__asm__ __volatile__(
"movl %0, %%cr3\n\t"
: /* No output */
: "r" (addr));
}
/*
* get_cr3()
* Return the value of the processor config register cr0
*/
inline extern ulong
get_cr0(void)
{
register ulong res;
__asm__ __volatile__(
"movl %%cr0, %0\n\t"
: "=r" (res)
: /* No input */);
return(res);
}
/*
* get_cr3()
* Get the value of the processor config register cr2 - the fault
* address register
*/
inline extern ulong
get_cr2(void)
{
register ulong res;
__asm__ __volatile__(
"movl %%cr2, %0\n\t"
: "=r" (res)
: /* No input */);
return(res);
}
/*
* get_cr3()
* Get the value of the processor config register cr3 - the L1 page
* table pointer
*/
inline extern ulong
get_cr3(void)
{
register ulong res;
__asm__ __volatile__(
"movl %%cr3, %0\n\t"
: "=r" (res)
: /* No input */);
return(res);
}
/*
* flush_tlb()
* Flush the processor page table "translation lookaside buffer"
*
* Shoot the whole thing on the i386; invalidate individual entries
* on the i486 and later.
*/
inline extern void
flush_tlb(void *va)
{
#ifndef __i486__
__asm__ __volatile__ (
"movl %%cr3, %%eax\n\t"
"movl %%eax, %%cr3\n\t"
: /* No output */
: /* No input */
: "ax");
#else
__asm__ __volatile__ (
"invlpg ($0)\n\t"
: /* No output */
: "r" (vaddr));
#endif
}
/*
* lgdt()
* Load the global descriptor table register
*/
inline extern void
lgdt(void *gdt_base)
{
__asm__ __volatile__(
"lgdt (%%eax)\n\t"
"jmp 1f\n"
"1:\n\t"
: /* No output */
: "a" (gdt_base));
}
/*
* lidt()
* Load the interrupt descriptor table register
*/
inline extern void
lidt(void *idt_base)
{
__asm__ __volatile__(
"lidt (%%eax)\n\t"
"jmp 1f\n"
"1:\n\t"
: /* No output */
: "a" (idt_base));
}
/*
* ltr()
* Load the task register
*/
inline extern void
ltr(uint tr_base)
{
__asm__ __volatile__(
"ltr %%eax\n\t"
"jmp 1f\n"
"1:\n\t"
: /* No output */
: "a" (tr_base));
}
/*
* cli()
* Disable the maskable processor interrupts.
*/
inline extern void
cli(void)
{
__asm__ __volatile__(
"cli\n\t"
: /* No output */
: /* No input */);
}
/*
* sti()
* Enable maskable interrupts
*/
inline extern void
sti(void)
{
__asm__ __volatile__(
"sti\n\t"
: /* No output */
: /* No input */);
}
/*
* geti()
* Get the mask setting for the maskable interrupts
*
* We return the result directly in the form required for a spinlock op
*/
inline extern uint
geti(void)
{
register uint res;
__asm__ __volatile__(
"pushfl\n\t"
"popl %0\n\t"
"andl $0x200,%0\n\t"
"shrl $2,%0\n\t"
"xorl $0x80,%0"
: "=r" (res)
: /* No input */);
return(res);
}
/*
* inportb()
* Get a byte from an I/O port
*/
inline extern uchar
inportb(int port)
{
register uchar res;
__asm__ __volatile__(
"inb %%dx,%%al\n\t"
: "=a" (res)
: "d" (port));
return(res);
}
/*
* outportb()
* Write a byte to an I/O port
*/
inline extern void
outportb(int port, uchar data)
{
__asm__ __volatile__(
"outb %%al,%%dx\n\t"
: /* No output */
: "a" (data), "d" (port));
}
/*
* idle_stack()
* Switch to using the idle stack
*/
inline extern void
idle_stack(void)
{
__asm__ __volatile__ (
"movl $_id_stack-0x40,%%esp\n\t"
"movl $_id_stack,%%ebp\n\t"
: /* No output */
: /* No input */);
}
/*
* on_idle_stack()
* Tell if we're running on the idle stack
*/
inline extern int
on_idle_stack(void)
{
extern void *id_top;
int res;
__asm__ __volatile__ (
" subl %0,%0\n"
" cmpl $_id_top,%%esp\n"
" ja 1f\n"
" incl %0\n"
"1:"
: "=r" (res)
: /* No input */);
return(res);
}
/*
* idle()
* Run idle - do nothing except wait for something to happen :-)
*
* We watch for num_run to go non-zero; we use sti/halt to atomically
* enable interrupts and halt the CPU--this saves a fair amount of power
* and heat.
*/
inline extern void
idle(void)
{
__asm__ __volatile__ (
"movl $_num_run,%%eax\n\t"
"movl $0,%%edx\n"
"1:\t"
"cmpl %%edx,(%%eax)\n\t"
"jne 2f\n\t"
"hlt\n\t"
"jmp 1b\n\t"
".align 2,0x90\n"
"2:\n\t"
: /* No output */
: /* No input */
: "ax", "dx");
}
/*
* setjmp()
* Save context, returning 0
*
* We don't bother to save registers whose value we know at the end of
* a matching longjmp (eax and edi)
*/
inline extern int
setjmp(jmp_buf regs)
{
register int retcode;
__asm__ __volatile__ (
"movl $1f,(%%edi)\n\t"
"movl %%esi,8(%%edi)\n\t"
"movl %%esp,%%eax\n\t"
"movl %%ebp,12(%%edi)\n\t"
"subl $4,%%eax\n\t"
"movl %%eax,16(%%edi)\n\t"
"xorl %%eax,%%eax\n\t"
"movl %%ebx,20(%%edi)\n\t"
"movl %%edx,24(%%edi)\n\t"
"movl %%ecx,28(%%edi)\n"
"1:\n\t"
: "=a" (retcode)
: "D" (regs));
return(retcode);
}
/*
* longjmp()
* Restore context, returning a specified result
*/
inline extern void
longjmp(jmp_buf regs, int retval)
{
__asm__ __volatile__ (
"movl 16(%%edi),%%esp\n\t"
"movl 12(%%edi),%%ebp\n\t"
"movl 8(%%edi),%%esi\n\t"
"movl (%%edi),%%edx\n\t"
"movl %%edx,(%%esp)\n\t"
"movl 20(%%edi),%%ebx\n\t"
"movl 24(%%edi),%%edx\n\t"
"movl 28(%%edi),%%ecx\n\t"
"ret\n\t"
: /* No output */
: "D" (regs), "a" (retval));
}
/*
* copyin()
* Copy data from user to kernel space
*
* This is really just a frontend to the real copy function, but
* using this we pass the parameters in registers so it's a little quicker
*/
inline extern int
copyin(void *uaddr, void *sysaddr, uint nbyte)
{
register int retval;
struct thread *t = curthread;
extern int __copyin();
t->t_probe = cpfail;
__asm__ __volatile__ (
"call ___copyin\n\t"
: "=a" (retval)
: "S" (uaddr), "D" (sysaddr), "c" (nbyte)
: "si", "di", "cx");
t->t_probe = 0;
return(retval);
}
/*
* copyout()
* Copy data from kernel to user space
*
* This is really just a frontend to the real copy function, but
* using this we pass the parameters in registers so it's a little quicker
*/
inline extern int
copyout(void *uaddr, void *sysaddr, uint nbyte)
{
register int retval;
struct thread *t = curthread;
extern int __copyout();
t->t_probe = cpfail;
__asm__ __volatile__ (
"call ___copyout\n\t"
: "=a" (retval)
: "S" (sysaddr), "D" (uaddr), "c" (nbyte)
: "si", "di", "cx");
t->t_probe = 0;
return(retval);
}
/*
* uucopy()
* Copy bytes from one user space to another
*
* This is used to copy memory from a message reply after attaching
* it to the user's address space.
*
* We just map the "from" address into user space, then let copyout()
* do all the work. This means we trust "from", but since it's a
* system-generated address, this should be OK.
*/
inline extern int
uucopy(void *uaddr, void *sysaddr, uint count)
{
return(copyout(uaddr, (void *)((ulong)sysaddr | UOFF), count));
}
#endif /* _MACH_LOCORE_H */