![Ralf Baechle](/assets/img/avatar_default.png)
Since Ingo's recent scheduler rewrite which was merged as commit
0437e109e1
sched_cacheflush is unused.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
319 lines
8.3 KiB
C
319 lines
8.3 KiB
C
#ifndef __ASM_SYSTEM_H
|
|
#define __ASM_SYSTEM_H
|
|
|
|
#include <linux/kernel.h>
|
|
#include <asm/segment.h>
|
|
#include <asm/cpufeature.h>
|
|
#include <asm/cmpxchg.h>
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
struct task_struct; /* one of the stranger aspects of C forward declarations.. */
|
|
extern struct task_struct * FASTCALL(__switch_to(struct task_struct *prev, struct task_struct *next));
|
|
|
|
/*
|
|
* Saving eflags is important. It switches not only IOPL between tasks,
|
|
* it also protects other tasks from NT leaking through sysenter etc.
|
|
*/
|
|
#define switch_to(prev,next,last) do { \
|
|
unsigned long esi,edi; \
|
|
asm volatile("pushfl\n\t" /* Save flags */ \
|
|
"pushl %%ebp\n\t" \
|
|
"movl %%esp,%0\n\t" /* save ESP */ \
|
|
"movl %5,%%esp\n\t" /* restore ESP */ \
|
|
"movl $1f,%1\n\t" /* save EIP */ \
|
|
"pushl %6\n\t" /* restore EIP */ \
|
|
"jmp __switch_to\n" \
|
|
"1:\t" \
|
|
"popl %%ebp\n\t" \
|
|
"popfl" \
|
|
:"=m" (prev->thread.esp),"=m" (prev->thread.eip), \
|
|
"=a" (last),"=S" (esi),"=D" (edi) \
|
|
:"m" (next->thread.esp),"m" (next->thread.eip), \
|
|
"2" (prev), "d" (next)); \
|
|
} while (0)
|
|
|
|
#define _set_base(addr,base) do { unsigned long __pr; \
|
|
__asm__ __volatile__ ("movw %%dx,%1\n\t" \
|
|
"rorl $16,%%edx\n\t" \
|
|
"movb %%dl,%2\n\t" \
|
|
"movb %%dh,%3" \
|
|
:"=&d" (__pr) \
|
|
:"m" (*((addr)+2)), \
|
|
"m" (*((addr)+4)), \
|
|
"m" (*((addr)+7)), \
|
|
"0" (base) \
|
|
); } while(0)
|
|
|
|
#define _set_limit(addr,limit) do { unsigned long __lr; \
|
|
__asm__ __volatile__ ("movw %%dx,%1\n\t" \
|
|
"rorl $16,%%edx\n\t" \
|
|
"movb %2,%%dh\n\t" \
|
|
"andb $0xf0,%%dh\n\t" \
|
|
"orb %%dh,%%dl\n\t" \
|
|
"movb %%dl,%2" \
|
|
:"=&d" (__lr) \
|
|
:"m" (*(addr)), \
|
|
"m" (*((addr)+6)), \
|
|
"0" (limit) \
|
|
); } while(0)
|
|
|
|
#define set_base(ldt,base) _set_base( ((char *)&(ldt)) , (base) )
|
|
#define set_limit(ldt,limit) _set_limit( ((char *)&(ldt)) , ((limit)-1) )
|
|
|
|
/*
|
|
* Load a segment. Fall back on loading the zero
|
|
* segment if something goes wrong..
|
|
*/
|
|
#define loadsegment(seg,value) \
|
|
asm volatile("\n" \
|
|
"1:\t" \
|
|
"mov %0,%%" #seg "\n" \
|
|
"2:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
"3:\t" \
|
|
"pushl $0\n\t" \
|
|
"popl %%" #seg "\n\t" \
|
|
"jmp 2b\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n\t" \
|
|
".align 4\n\t" \
|
|
".long 1b,3b\n" \
|
|
".previous" \
|
|
: :"rm" (value))
|
|
|
|
/*
|
|
* Save a segment register away
|
|
*/
|
|
#define savesegment(seg, value) \
|
|
asm volatile("mov %%" #seg ",%0":"=rm" (value))
|
|
|
|
|
|
static inline void native_clts(void)
|
|
{
|
|
asm volatile ("clts");
|
|
}
|
|
|
|
static inline unsigned long native_read_cr0(void)
|
|
{
|
|
unsigned long val;
|
|
asm volatile("movl %%cr0,%0\n\t" :"=r" (val));
|
|
return val;
|
|
}
|
|
|
|
static inline void native_write_cr0(unsigned long val)
|
|
{
|
|
asm volatile("movl %0,%%cr0": :"r" (val));
|
|
}
|
|
|
|
static inline unsigned long native_read_cr2(void)
|
|
{
|
|
unsigned long val;
|
|
asm volatile("movl %%cr2,%0\n\t" :"=r" (val));
|
|
return val;
|
|
}
|
|
|
|
static inline void native_write_cr2(unsigned long val)
|
|
{
|
|
asm volatile("movl %0,%%cr2": :"r" (val));
|
|
}
|
|
|
|
static inline unsigned long native_read_cr3(void)
|
|
{
|
|
unsigned long val;
|
|
asm volatile("movl %%cr3,%0\n\t" :"=r" (val));
|
|
return val;
|
|
}
|
|
|
|
static inline void native_write_cr3(unsigned long val)
|
|
{
|
|
asm volatile("movl %0,%%cr3": :"r" (val));
|
|
}
|
|
|
|
static inline unsigned long native_read_cr4(void)
|
|
{
|
|
unsigned long val;
|
|
asm volatile("movl %%cr4,%0\n\t" :"=r" (val));
|
|
return val;
|
|
}
|
|
|
|
static inline unsigned long native_read_cr4_safe(void)
|
|
{
|
|
unsigned long val;
|
|
/* This could fault if %cr4 does not exist */
|
|
asm("1: movl %%cr4, %0 \n"
|
|
"2: \n"
|
|
".section __ex_table,\"a\" \n"
|
|
".long 1b,2b \n"
|
|
".previous \n"
|
|
: "=r" (val): "0" (0));
|
|
return val;
|
|
}
|
|
|
|
static inline void native_write_cr4(unsigned long val)
|
|
{
|
|
asm volatile("movl %0,%%cr4": :"r" (val));
|
|
}
|
|
|
|
static inline void native_wbinvd(void)
|
|
{
|
|
asm volatile("wbinvd": : :"memory");
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_PARAVIRT
|
|
#include <asm/paravirt.h>
|
|
#else
|
|
#define read_cr0() (native_read_cr0())
|
|
#define write_cr0(x) (native_write_cr0(x))
|
|
#define read_cr2() (native_read_cr2())
|
|
#define write_cr2(x) (native_write_cr2(x))
|
|
#define read_cr3() (native_read_cr3())
|
|
#define write_cr3(x) (native_write_cr3(x))
|
|
#define read_cr4() (native_read_cr4())
|
|
#define read_cr4_safe() (native_read_cr4_safe())
|
|
#define write_cr4(x) (native_write_cr4(x))
|
|
#define wbinvd() (native_wbinvd())
|
|
|
|
/* Clear the 'TS' bit */
|
|
#define clts() (native_clts())
|
|
|
|
#endif/* CONFIG_PARAVIRT */
|
|
|
|
/* Set the 'TS' bit */
|
|
#define stts() write_cr0(8 | read_cr0())
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
static inline unsigned long get_limit(unsigned long segment)
|
|
{
|
|
unsigned long __limit;
|
|
__asm__("lsll %1,%0"
|
|
:"=r" (__limit):"r" (segment));
|
|
return __limit+1;
|
|
}
|
|
|
|
#define nop() __asm__ __volatile__ ("nop")
|
|
|
|
/*
|
|
* Force strict CPU ordering.
|
|
* And yes, this is required on UP too when we're talking
|
|
* to devices.
|
|
*
|
|
* For now, "wmb()" doesn't actually do anything, as all
|
|
* Intel CPU's follow what Intel calls a *Processor Order*,
|
|
* in which all writes are seen in the program order even
|
|
* outside the CPU.
|
|
*
|
|
* I expect future Intel CPU's to have a weaker ordering,
|
|
* but I'd also expect them to finally get their act together
|
|
* and add some real memory barriers if so.
|
|
*
|
|
* Some non intel clones support out of order store. wmb() ceases to be a
|
|
* nop for these.
|
|
*/
|
|
|
|
|
|
/*
|
|
* Actually only lfence would be needed for mb() because all stores done
|
|
* by the kernel should be already ordered. But keep a full barrier for now.
|
|
*/
|
|
|
|
#define mb() alternative("lock; addl $0,0(%%esp)", "mfence", X86_FEATURE_XMM2)
|
|
#define rmb() alternative("lock; addl $0,0(%%esp)", "lfence", X86_FEATURE_XMM2)
|
|
|
|
/**
|
|
* read_barrier_depends - Flush all pending reads that subsequents reads
|
|
* depend on.
|
|
*
|
|
* No data-dependent reads from memory-like regions are ever reordered
|
|
* over this barrier. All reads preceding this primitive are guaranteed
|
|
* to access memory (but not necessarily other CPUs' caches) before any
|
|
* reads following this primitive that depend on the data return by
|
|
* any of the preceding reads. This primitive is much lighter weight than
|
|
* rmb() on most CPUs, and is never heavier weight than is
|
|
* rmb().
|
|
*
|
|
* These ordering constraints are respected by both the local CPU
|
|
* and the compiler.
|
|
*
|
|
* Ordering is not guaranteed by anything other than these primitives,
|
|
* not even by data dependencies. See the documentation for
|
|
* memory_barrier() for examples and URLs to more information.
|
|
*
|
|
* For example, the following code would force ordering (the initial
|
|
* value of "a" is zero, "b" is one, and "p" is "&a"):
|
|
*
|
|
* <programlisting>
|
|
* CPU 0 CPU 1
|
|
*
|
|
* b = 2;
|
|
* memory_barrier();
|
|
* p = &b; q = p;
|
|
* read_barrier_depends();
|
|
* d = *q;
|
|
* </programlisting>
|
|
*
|
|
* because the read of "*q" depends on the read of "p" and these
|
|
* two reads are separated by a read_barrier_depends(). However,
|
|
* the following code, with the same initial values for "a" and "b":
|
|
*
|
|
* <programlisting>
|
|
* CPU 0 CPU 1
|
|
*
|
|
* a = 2;
|
|
* memory_barrier();
|
|
* b = 3; y = b;
|
|
* read_barrier_depends();
|
|
* x = a;
|
|
* </programlisting>
|
|
*
|
|
* does not enforce ordering, since there is no data dependency between
|
|
* the read of "a" and the read of "b". Therefore, on some CPUs, such
|
|
* as Alpha, "y" could be set to 3 and "x" to 0. Use rmb()
|
|
* in cases like this where there are no data dependencies.
|
|
**/
|
|
|
|
#define read_barrier_depends() do { } while(0)
|
|
|
|
#ifdef CONFIG_X86_OOSTORE
|
|
/* Actually there are no OOO store capable CPUs for now that do SSE,
|
|
but make it already an possibility. */
|
|
#define wmb() alternative("lock; addl $0,0(%%esp)", "sfence", X86_FEATURE_XMM)
|
|
#else
|
|
#define wmb() __asm__ __volatile__ ("": : :"memory")
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
#define smp_mb() mb()
|
|
#define smp_rmb() rmb()
|
|
#define smp_wmb() wmb()
|
|
#define smp_read_barrier_depends() read_barrier_depends()
|
|
#define set_mb(var, value) do { (void) xchg(&var, value); } while (0)
|
|
#else
|
|
#define smp_mb() barrier()
|
|
#define smp_rmb() barrier()
|
|
#define smp_wmb() barrier()
|
|
#define smp_read_barrier_depends() do { } while(0)
|
|
#define set_mb(var, value) do { var = value; barrier(); } while (0)
|
|
#endif
|
|
|
|
#include <linux/irqflags.h>
|
|
|
|
/*
|
|
* disable hlt during certain critical i/o operations
|
|
*/
|
|
#define HAVE_DISABLE_HLT
|
|
void disable_hlt(void);
|
|
void enable_hlt(void);
|
|
|
|
extern int es7000_plat;
|
|
void cpu_idle_wait(void);
|
|
|
|
extern unsigned long arch_align_stack(unsigned long sp);
|
|
extern void free_init_pages(char *what, unsigned long begin, unsigned long end);
|
|
|
|
void default_idle(void);
|
|
|
|
#endif
|