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#ifndef CPU_X86_LAPIC_H
#define CPU_X86_LAPIC_H
#include <cpu/x86/lapic_def.h>
#include <cpu/x86/msr.h>
#include <halt.h>
static __always_inline unsigned long lapic_read(unsigned long reg)
{
return *((volatile unsigned long *)(LAPIC_DEFAULT_BASE+reg));
}
static __always_inline void lapic_write(unsigned long reg, unsigned long v)
{
*((volatile unsigned long *)(LAPIC_DEFAULT_BASE+reg)) = v;
}
static __always_inline void lapic_wait_icr_idle(void)
{
do { } while (lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY);
}
static inline void enable_lapic(void)
{
msr_t msr;
msr = rdmsr(LAPIC_BASE_MSR);
msr.hi &= 0xffffff00;
msr.lo &= ~LAPIC_BASE_MSR_ADDR_MASK;
msr.lo |= LAPIC_DEFAULT_BASE;
msr.lo |= LAPIC_BASE_MSR_ENABLE;
wrmsr(LAPIC_BASE_MSR, msr);
}
static inline void disable_lapic(void)
{
msr_t msr;
msr = rdmsr(LAPIC_BASE_MSR);
msr.lo &= ~LAPIC_BASE_MSR_ENABLE;
wrmsr(LAPIC_BASE_MSR, msr);
}
static __always_inline unsigned long lapicid(void)
{
return lapic_read(LAPIC_ID) >> 24;
}
#if !CONFIG(AP_IN_SIPI_WAIT)
/* If we need to go back to sipi wait, we use the long non-inlined version of
* this function in lapic_cpu_init.c
*/
static __always_inline void stop_this_cpu(void)
{
/* Called by an AP when it is ready to halt and wait for a new task */
halt();
}
#else
void stop_this_cpu(void);
#endif
#define xchg(ptr, v) ((__typeof__(*(ptr)))__xchg((unsigned long)(v), (ptr), \
sizeof(*(ptr))))
struct __xchg_dummy { unsigned long a[100]; };
#define __xg(x) ((struct __xchg_dummy *)(x))
/*
* Note: no "lock" prefix even on SMP: xchg always implies lock anyway
* Note 2: xchg has side effect, so that attribute volatile is necessary,
* but generally the primitive is invalid, *ptr is output argument. --ANK
*/
static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
int size)
{
switch (size) {
case 1:
__asm__ __volatile__("xchgb %b0,%1"
: "=q" (x)
: "m" (*__xg(ptr)), "0" (x)
: "memory");
break;
case 2:
__asm__ __volatile__("xchgw %w0,%1"
: "=r" (x)
: "m" (*__xg(ptr)), "0" (x)
: "memory");
break;
case 4:
__asm__ __volatile__("xchgl %0,%1"
: "=r" (x)
: "m" (*__xg(ptr)), "0" (x)
: "memory");
break;
}
return x;
}
static inline void lapic_write_atomic(unsigned long reg, unsigned long v)
{
(void)xchg((volatile unsigned long *)(LAPIC_DEFAULT_BASE+reg), v);
}
#ifdef X86_GOOD_APIC
# define FORCE_READ_AROUND_WRITE 0
# define lapic_read_around(x) lapic_read(x)
# define lapic_write_around(x, y) lapic_write((x), (y))
#else
# define FORCE_READ_AROUND_WRITE 1
# define lapic_read_around(x) lapic_read(x)
# define lapic_write_around(x, y) lapic_write_atomic((x), (y))
#endif
void do_lapic_init(void);
/* See if I need to initialize the local APIC */
static inline int need_lapic_init(void)
{
return CONFIG(SMP) || CONFIG(IOAPIC);
}
static inline void setup_lapic(void)
{
if (need_lapic_init())
do_lapic_init();
else
disable_lapic();
}
struct device;
int start_cpu(struct device *cpu);
#endif /* CPU_X86_LAPIC_H */
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