xv6/x86.h
rtm 8a8be1b8c3 low-level keyboard input (not hooked up to /dev yet)
fix acquire() to cli() *before* incrementing nlock
make T_SYSCALL a trap gate, not an interrupt gate
sadly, various crashes if you hold down a keyboard key...
2006-08-10 02:07:10 +00:00

368 lines
8.2 KiB
C

static __inline void breakpoint(void) __attribute__((always_inline));
static __inline uchar inb(int port) __attribute__((always_inline));
static __inline void insb(int port, void *addr, int cnt) __attribute__((always_inline));
static __inline ushort inw(int port) __attribute__((always_inline));
static __inline void insw(int port, void *addr, int cnt) __attribute__((always_inline));
static __inline uint inl(int port) __attribute__((always_inline));
static __inline void insl(int port, void *addr, int cnt) __attribute__((always_inline));
static __inline void outb(int port, uchar data) __attribute__((always_inline));
static __inline void outsb(int port, const void *addr, int cnt) __attribute__((always_inline));
static __inline void outw(int port, ushort data) __attribute__((always_inline));
static __inline void outsw(int port, const void *addr, int cnt) __attribute__((always_inline));
static __inline void outsl(int port, const void *addr, int cnt) __attribute__((always_inline));
static __inline void outl(int port, uint data) __attribute__((always_inline));
static __inline void invlpg(void *addr) __attribute__((always_inline));
struct segdesc;
static __inline void lgdt(struct segdesc *p, int) __attribute__((always_inline));
struct gatedesc;
static __inline void lidt(struct gatedesc *p, int) __attribute__((always_inline));
static __inline void lldt(ushort sel) __attribute__((always_inline));
static __inline void ltr(ushort sel) __attribute__((always_inline));
static __inline void lcr0(uint val) __attribute__((always_inline));
static __inline uint rcr0(void) __attribute__((always_inline));
static __inline uint rcr2(void) __attribute__((always_inline));
static __inline void lcr3(uint val) __attribute__((always_inline));
static __inline uint rcr3(void) __attribute__((always_inline));
static __inline void lcr4(uint val) __attribute__((always_inline));
static __inline uint rcr4(void) __attribute__((always_inline));
static __inline void tlbflush(void) __attribute__((always_inline));
static __inline uint read_eflags(void) __attribute__((always_inline));
static __inline void write_eflags(uint eflags) __attribute__((always_inline));
static __inline uint read_ebp(void) __attribute__((always_inline));
static __inline uint read_esp(void) __attribute__((always_inline));
static __inline void cpuid(uint info, uint *eaxp, uint *ebxp, uint *ecxp, uint *edxp);
static __inline void cli(void) __attribute__((always_inline));
static __inline void sti(void) __attribute__((always_inline));
static __inline void
breakpoint(void)
{
__asm __volatile("int3");
}
static __inline uchar
inb(int port)
{
uchar data;
__asm __volatile("inb %w1,%0" : "=a" (data) : "d" (port));
return data;
}
static __inline void
insb(int port, void *addr, int cnt)
{
__asm __volatile("cld\n\trepne\n\tinsb" :
"=D" (addr), "=c" (cnt) :
"d" (port), "0" (addr), "1" (cnt) :
"memory", "cc");
}
static __inline ushort
inw(int port)
{
ushort data;
__asm __volatile("inw %w1,%0" : "=a" (data) : "d" (port));
return data;
}
static __inline void
insw(int port, void *addr, int cnt)
{
__asm __volatile("cld\n\trepne\n\tinsw" :
"=D" (addr), "=c" (cnt) :
"d" (port), "0" (addr), "1" (cnt) :
"memory", "cc");
}
static __inline uint
inl(int port)
{
uint data;
__asm __volatile("inl %w1,%0" : "=a" (data) : "d" (port));
return data;
}
static __inline void
insl(int port, void *addr, int cnt)
{
__asm __volatile("cld\n\trepne\n\tinsl" :
"=D" (addr), "=c" (cnt) :
"d" (port), "0" (addr), "1" (cnt) :
"memory", "cc");
}
static __inline void
outb(int port, uchar data)
{
__asm __volatile("outb %0,%w1" : : "a" (data), "d" (port));
}
static __inline void
outsb(int port, const void *addr, int cnt)
{
__asm __volatile("cld\n\trepne\n\toutsb" :
"=S" (addr), "=c" (cnt) :
"d" (port), "0" (addr), "1" (cnt) :
"cc");
}
static __inline void
outw(int port, ushort data)
{
__asm __volatile("outw %0,%w1" : : "a" (data), "d" (port));
}
static __inline void
outsw(int port, const void *addr, int cnt)
{
__asm __volatile("cld\n\trepne\n\toutsw" :
"=S" (addr), "=c" (cnt) :
"d" (port), "0" (addr), "1" (cnt) :
"cc");
}
static __inline void
outsl(int port, const void *addr, int cnt)
{
__asm __volatile("cld\n\trepne\n\toutsl" :
"=S" (addr), "=c" (cnt) :
"d" (port), "0" (addr), "1" (cnt) :
"cc");
}
static __inline void
outl(int port, uint data)
{
__asm __volatile("outl %0,%w1" : : "a" (data), "d" (port));
}
static __inline void
invlpg(void *addr)
{
__asm __volatile("invlpg (%0)" : : "r" (addr) : "memory");
}
static __inline void
lgdt(struct segdesc *p, int size)
{
volatile ushort pd[3];
pd[0] = size-1;
pd[1] = (uint)p;
pd[2] = (uint)p >> 16;
asm volatile("lgdt (%0)" : : "g" (pd));
}
static __inline void
lidt(struct gatedesc *p, int size)
{
volatile ushort pd[3];
pd[0] = size-1;
pd[1] = (uint)p;
pd[2] = (uint)p >> 16;
asm volatile("lidt (%0)" : : "g" (pd));
}
static __inline void
lldt(ushort sel)
{
__asm __volatile("lldt %0" : : "r" (sel));
}
static __inline void
ltr(ushort sel)
{
__asm __volatile("ltr %0" : : "r" (sel));
}
static __inline void
lcr0(uint val)
{
__asm __volatile("movl %0,%%cr0" : : "r" (val));
}
static __inline uint
rcr0(void)
{
uint val;
__asm __volatile("movl %%cr0,%0" : "=r" (val));
return val;
}
static __inline uint
rcr2(void)
{
uint val;
__asm __volatile("movl %%cr2,%0" : "=r" (val));
return val;
}
static __inline void
lcr3(uint val)
{
__asm __volatile("movl %0,%%cr3" : : "r" (val));
}
static __inline uint
rcr3(void)
{
uint val;
__asm __volatile("movl %%cr3,%0" : "=r" (val));
return val;
}
static __inline void
lcr4(uint val)
{
__asm __volatile("movl %0,%%cr4" : : "r" (val));
}
static __inline uint
rcr4(void)
{
uint cr4;
__asm __volatile("movl %%cr4,%0" : "=r" (cr4));
return cr4;
}
static __inline void
tlbflush(void)
{
uint cr3;
__asm __volatile("movl %%cr3,%0" : "=r" (cr3));
__asm __volatile("movl %0,%%cr3" : : "r" (cr3));
}
static __inline uint
read_eflags(void)
{
uint eflags;
__asm __volatile("pushfl; popl %0" : "=r" (eflags));
return eflags;
}
static __inline void
write_eflags(uint eflags)
{
__asm __volatile("pushl %0; popfl" : : "r" (eflags));
}
static __inline uint
read_ebp(void)
{
uint ebp;
__asm __volatile("movl %%ebp,%0" : "=r" (ebp));
return ebp;
}
static __inline uint
read_esp(void)
{
uint esp;
__asm __volatile("movl %%esp,%0" : "=r" (esp));
return esp;
}
static __inline uint
read_esi(void)
{
uint esi;
__asm __volatile("movl %%esi,%0" : "=r" (esi));
return esi;
}
static __inline uint
read_edi(void)
{
uint edi;
__asm __volatile("movl %%edi,%0" : "=r" (edi));
return edi;
}
static __inline uint
read_ebx(void)
{
uint ebx;
__asm __volatile("movl %%ebx,%0" : "=r" (ebx));
return ebx;
}
static __inline void
cpuid(uint info, uint *eaxp, uint *ebxp, uint *ecxp, uint *edxp)
{
uint eax, ebx, ecx, edx;
asm volatile("cpuid"
: "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)
: "a" (info));
if (eaxp)
*eaxp = eax;
if (ebxp)
*ebxp = ebx;
if (ecxp)
*ecxp = ecx;
if (edxp)
*edxp = edx;
}
static __inline uint
cmpxchg(uint oldval, uint newval, volatile uint* lock_addr)
{
uint result;
__asm__ __volatile__(
"lock; cmpxchgl %2, %0"
:"+m" (*lock_addr), "=a" (result) : "r"(newval), "1"(oldval) : "cc"
);
return result;
}
static __inline void
cli(void)
{
__asm__ volatile("cli");
}
static __inline void
sti(void)
{
__asm__ volatile("sti");
}
struct trapframe {
/* registers as pushed by pusha */
uint edi;
uint esi;
uint ebp;
uint oesp; /* Useless */
uint ebx;
uint edx;
uint ecx;
uint eax;
/* rest of trap frame */
ushort es;
ushort padding1;
ushort ds;
ushort padding2;
uint trapno;
/* below here defined by x86 hardware */
uint err;
uint eip;
ushort cs;
ushort padding3;
uint eflags;
/* below here only when crossing rings, such as from user to kernel */
uint esp;
ushort ss;
ushort padding4;
};
#define MAX_IRQS 16 // Number of IRQs
#define IRQ_OFFSET 32 // IRQ 0 corresponds to int IRQ_OFFSET
#define IRQ_KBD 1
#define IRQ_IDE 14
#define IRQ_ERROR 19
#define IRQ_SPURIOUS 31