xv6-cs450/x86.h

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C
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// Routines to let C code use special x86 instructions.
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static inline uchar
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inb(ushort port)
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{
uchar data;
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asm volatile("in %1,%0" : "=a" (data) : "d" (port));
return data;
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}
static inline void
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insl(int port, void *addr, int cnt)
{
asm volatile("cld; rep insl" :
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"=D" (addr), "=c" (cnt) :
"d" (port), "0" (addr), "1" (cnt) :
"memory", "cc");
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}
static inline void
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outb(ushort port, uchar data)
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{
asm volatile("out %0,%1" : : "a" (data), "d" (port));
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}
static inline void
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outw(ushort port, ushort data)
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{
asm volatile("out %0,%1" : : "a" (data), "d" (port));
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}
static inline void
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outsl(int port, const void *addr, int cnt)
{
asm volatile("cld; rep outsl" :
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"=S" (addr), "=c" (cnt) :
"d" (port), "0" (addr), "1" (cnt) :
"cc");
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}
static inline void
stosb(void *addr, int data, int cnt)
{
asm volatile("cld; rep stosb" :
"=D" (addr), "=c" (cnt) :
"0" (addr), "1" (cnt), "a" (data) :
"memory", "cc");
}
struct segdesc;
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static inline void
lgdt(struct segdesc *p, int size)
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{
volatile ushort pd[3];
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pd[0] = size-1;
pd[1] = (uint)p;
pd[2] = (uint)p >> 16;
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asm volatile("lgdt (%0)" : : "r" (pd));
}
struct gatedesc;
static inline void
lidt(struct gatedesc *p, int size)
{
volatile ushort pd[3];
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pd[0] = size-1;
pd[1] = (uint)p;
pd[2] = (uint)p >> 16;
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asm volatile("lidt (%0)" : : "r" (pd));
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}
static inline void
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ltr(ushort sel)
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{
asm volatile("ltr %0" : : "r" (sel));
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}
static inline uint
readeflags(void)
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{
uint eflags;
asm volatile("pushfl; popl %0" : "=r" (eflags));
return eflags;
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}
static inline uint
xchg(volatile uint *addr, uint newval)
{
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uint result;
// The + in "+m" denotes a read-modify-write operand.
asm volatile("lock; xchgl %0, %1" :
"+m" (*addr), "=a" (result) :
"1" (newval) :
"cc");
return result;
}
static inline void
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loadfsgs(ushort v)
{
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asm volatile("movw %0, %%fs" : : "r" (v));
asm volatile("movw %0, %%gs" : : "r" (v));
}
static inline void
cli(void)
{
asm volatile("cli");
}
static inline void
sti(void)
{
asm volatile("sti");
}
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// Layout of the trap frame built on the stack by the
// hardware and by trapasm.S, and passed to trap().
struct trapframe {
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// registers as pushed by pusha
uint edi;
uint esi;
uint ebp;
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uint oesp; // useless & ignored
uint ebx;
uint edx;
uint ecx;
uint eax;
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// rest of trap frame
ushort gs;
ushort padding1;
ushort fs;
ushort padding2;
ushort es;
ushort padding3;
ushort ds;
ushort padding4;
uint trapno;
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// below here defined by x86 hardware
uint err;
uint eip;
ushort cs;
ushort padding5;
uint eflags;
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// below here only when crossing rings, such as from user to kernel
uint esp;
ushort ss;
ushort padding6;
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};