FreeBSD/Linux Kernel Cross Reference
sys/i386/include/cpufunc.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1993 The Regents of the University of California.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/12.0/sys/i386/include/cpufunc.h 334890 2018-06-09 18:31:19Z markj $
     */
    
    /*
     * Functions to provide access to special i386 instructions.
     * This in included in sys/systm.h, and that file should be
     * used in preference to this.
     */
    
    #ifndef _MACHINE_CPUFUNC_H_
    #define _MACHINE_CPUFUNC_H_
    
    #ifndef _SYS_CDEFS_H_
    #error this file needs sys/cdefs.h as a prerequisite
    #endif
    
    struct region_descriptor;
    
    #define readb(va)       (*(volatile uint8_t *) (va))
    #define readw(va)       (*(volatile uint16_t *) (va))
    #define readl(va)       (*(volatile uint32_t *) (va))
    
    #define writeb(va, d)   (*(volatile uint8_t *) (va) = (d))
    #define writew(va, d)   (*(volatile uint16_t *) (va) = (d))
    #define writel(va, d)   (*(volatile uint32_t *) (va) = (d))
    
    #if defined(__GNUCLIKE_ASM) && defined(__CC_SUPPORTS___INLINE)
    
    static __inline void
    breakpoint(void)
    {
            __asm __volatile("int $3");
    }
    
    static __inline __pure2 u_int
    bsfl(u_int mask)
    {
            u_int   result;
    
            __asm("bsfl %1,%0" : "=r" (result) : "rm" (mask) : "cc");
            return (result);
    }
    
    static __inline __pure2 u_int
    bsrl(u_int mask)
    {
            u_int   result;
    
            __asm("bsrl %1,%0" : "=r" (result) : "rm" (mask) : "cc");
            return (result);
    }
    
    static __inline void
    clflush(u_long addr)
    {
    
            __asm __volatile("clflush %0" : : "m" (*(char *)addr));
    }
    
    static __inline void
    clflushopt(u_long addr)
    {
    
            __asm __volatile(".byte 0x66;clflush %0" : : "m" (*(char *)addr));
    }
    
    static __inline void
    clts(void)
    {
   
           __asm __volatile("clts");
   }
   
   static __inline void
   disable_intr(void)
   {
   
           __asm __volatile("cli" : : : "memory");
   }
   
   static __inline void
   do_cpuid(u_int ax, u_int *p)
   {
           __asm __volatile("cpuid"
                            : "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3])
                            :  "" (ax));
   }
   
   static __inline void
   cpuid_count(u_int ax, u_int cx, u_int *p)
   {
           __asm __volatile("cpuid"
                            : "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3])
                            :  "" (ax), "c" (cx));
   }
   
   static __inline void
   enable_intr(void)
   {
   
           __asm __volatile("sti");
   }
   
   static __inline void
   cpu_monitor(const void *addr, u_long extensions, u_int hints)
   {
   
           __asm __volatile("monitor"
               : : "a" (addr), "c" (extensions), "d" (hints));
   }
   
   static __inline void
   cpu_mwait(u_long extensions, u_int hints)
   {
   
           __asm __volatile("mwait" : : "a" (hints), "c" (extensions));
   }
   
   static __inline void
   lfence(void)
   {
   
           __asm __volatile("lfence" : : : "memory");
   }
   
   static __inline void
   mfence(void)
   {
   
           __asm __volatile("mfence" : : : "memory");
   }
   
   static __inline void
   sfence(void)
   {
   
           __asm __volatile("sfence" : : : "memory");
   }
   
   #ifdef _KERNEL
   
   #define HAVE_INLINE_FFS
   
   static __inline __pure2 int
   ffs(int mask)
   {
           /*
            * Note that gcc-2's builtin ffs would be used if we didn't declare
            * this inline or turn off the builtin.  The builtin is faster but
            * broken in gcc-2.4.5 and slower but working in gcc-2.5 and later
            * versions.
            */
            return (mask == 0 ? mask : (int)bsfl((u_int)mask) + 1);
   }
   
   #define HAVE_INLINE_FFSL
   
   static __inline __pure2 int
   ffsl(long mask)
   {
           return (ffs((int)mask));
   }
   
   #define HAVE_INLINE_FLS
   
   static __inline __pure2 int
   fls(int mask)
   {
           return (mask == 0 ? mask : (int)bsrl((u_int)mask) + 1);
   }
   
   #define HAVE_INLINE_FLSL
   
   static __inline __pure2 int
   flsl(long mask)
   {
           return (fls((int)mask));
   }
   
   #endif /* _KERNEL */
   
   static __inline void
   halt(void)
   {
           __asm __volatile("hlt");
   }
   
   static __inline u_char
   inb(u_int port)
   {
           u_char  data;
   
           __asm __volatile("inb %w1, %0" : "=a" (data) : "Nd" (port));
           return (data);
   }
   
   static __inline u_int
   inl(u_int port)
   {
           u_int   data;
   
           __asm __volatile("inl %w1, %0" : "=a" (data) : "Nd" (port));
           return (data);
   }
   
   static __inline void
   insb(u_int port, void *addr, size_t count)
   {
           __asm __volatile("cld; rep; insb"
                            : "+D" (addr), "+c" (count)
                            : "d" (port)
                            : "memory");
   }
   
   static __inline void
   insw(u_int port, void *addr, size_t count)
   {
           __asm __volatile("cld; rep; insw"
                            : "+D" (addr), "+c" (count)
                            : "d" (port)
                            : "memory");
   }
   
   static __inline void
   insl(u_int port, void *addr, size_t count)
   {
           __asm __volatile("cld; rep; insl"
                            : "+D" (addr), "+c" (count)
                            : "d" (port)
                            : "memory");
   }
   
   static __inline void
   invd(void)
   {
           __asm __volatile("invd");
   }
   
   static __inline u_short
   inw(u_int port)
   {
           u_short data;
   
           __asm __volatile("inw %w1, %0" : "=a" (data) : "Nd" (port));
           return (data);
   }
   
   static __inline void
   outb(u_int port, u_char data)
   {
           __asm __volatile("outb %0, %w1" : : "a" (data), "Nd" (port));
   }
   
   static __inline void
   outl(u_int port, u_int data)
   {
           __asm __volatile("outl %0, %w1" : : "a" (data), "Nd" (port));
   }
   
   static __inline void
   outsb(u_int port, const void *addr, size_t count)
   {
           __asm __volatile("cld; rep; outsb"
                            : "+S" (addr), "+c" (count)
                            : "d" (port));
   }
   
   static __inline void
   outsw(u_int port, const void *addr, size_t count)
   {
           __asm __volatile("cld; rep; outsw"
                            : "+S" (addr), "+c" (count)
                            : "d" (port));
   }
   
   static __inline void
   outsl(u_int port, const void *addr, size_t count)
   {
           __asm __volatile("cld; rep; outsl"
                            : "+S" (addr), "+c" (count)
                            : "d" (port));
   }
   
   static __inline void
   outw(u_int port, u_short data)
   {
           __asm __volatile("outw %0, %w1" : : "a" (data), "Nd" (port));
   }
   
   static __inline void
   ia32_pause(void)
   {
           __asm __volatile("pause");
   }
   
   static __inline u_int
   read_eflags(void)
   {
           u_int   ef;
   
           __asm __volatile("pushfl; popl %0" : "=r" (ef));
           return (ef);
   }
   
   static __inline uint64_t
   rdmsr(u_int msr)
   {
           uint64_t rv;
   
           __asm __volatile("rdmsr" : "=A" (rv) : "c" (msr));
           return (rv);
   }
   
   static __inline uint32_t
   rdmsr32(u_int msr)
   {
           uint32_t low;
   
           __asm __volatile("rdmsr" : "=a" (low) : "c" (msr) : "edx");
           return (low);
   }
   
   static __inline uint64_t
   rdpmc(u_int pmc)
   {
           uint64_t rv;
   
           __asm __volatile("rdpmc" : "=A" (rv) : "c" (pmc));
           return (rv);
   }
   
   static __inline uint64_t
   rdtsc(void)
   {
           uint64_t rv;
   
           __asm __volatile("rdtsc" : "=A" (rv));
           return (rv);
   }
   
   static __inline uint64_t
   rdtscp(void)
   {
           uint64_t rv;
   
           __asm __volatile("rdtscp" : "=A" (rv) : : "ecx");
           return (rv);
   }
   
   static __inline uint32_t
   rdtsc32(void)
   {
           uint32_t rv;
   
           __asm __volatile("rdtsc" : "=a" (rv) : : "edx");
           return (rv);
   }
   
   static __inline void
   wbinvd(void)
   {
           __asm __volatile("wbinvd");
   }
   
   static __inline void
   write_eflags(u_int ef)
   {
           __asm __volatile("pushl %0; popfl" : : "r" (ef));
   }
   
   static __inline void
   wrmsr(u_int msr, uint64_t newval)
   {
           __asm __volatile("wrmsr" : : "A" (newval), "c" (msr));
   }
   
   static __inline void
   load_cr0(u_int data)
   {
   
           __asm __volatile("movl %0,%%cr0" : : "r" (data));
   }
   
   static __inline u_int
   rcr0(void)
   {
           u_int   data;
   
           __asm __volatile("movl %%cr0,%0" : "=r" (data));
           return (data);
   }
   
   static __inline u_int
   rcr2(void)
   {
           u_int   data;
   
           __asm __volatile("movl %%cr2,%0" : "=r" (data));
           return (data);
   }
   
   static __inline void
   load_cr3(u_int data)
   {
   
           __asm __volatile("movl %0,%%cr3" : : "r" (data) : "memory");
   }
   
   static __inline u_int
   rcr3(void)
   {
           u_int   data;
   
           __asm __volatile("movl %%cr3,%0" : "=r" (data));
           return (data);
   }
   
   static __inline void
   load_cr4(u_int data)
   {
           __asm __volatile("movl %0,%%cr4" : : "r" (data));
   }
   
   static __inline u_int
   rcr4(void)
   {
           u_int   data;
   
           __asm __volatile("movl %%cr4,%0" : "=r" (data));
           return (data);
   }
   
   static __inline uint64_t
   rxcr(u_int reg)
   {
           u_int low, high;
   
           __asm __volatile("xgetbv" : "=a" (low), "=d" (high) : "c" (reg));
           return (low | ((uint64_t)high << 32));
   }
   
   static __inline void
   load_xcr(u_int reg, uint64_t val)
   {
           u_int low, high;
   
           low = val;
           high = val >> 32;
           __asm __volatile("xsetbv" : : "c" (reg), "a" (low), "d" (high));
   }
   
   /*
    * Global TLB flush (except for thise for pages marked PG_G)
    */
   static __inline void
   invltlb(void)
   {
   
           load_cr3(rcr3());
   }
   
   /*
    * TLB flush for an individual page (even if it has PG_G).
    * Only works on 486+ CPUs (i386 does not have PG_G).
    */
   static __inline void
   invlpg(u_int addr)
   {
   
           __asm __volatile("invlpg %0" : : "m" (*(char *)addr) : "memory");
   }
   
   static __inline u_short
   rfs(void)
   {
           u_short sel;
           __asm __volatile("movw %%fs,%0" : "=rm" (sel));
           return (sel);
   }
   
   static __inline uint64_t
   rgdt(void)
   {
           uint64_t gdtr;
           __asm __volatile("sgdt %0" : "=m" (gdtr));
           return (gdtr);
   }
   
   static __inline u_short
   rgs(void)
   {
           u_short sel;
           __asm __volatile("movw %%gs,%0" : "=rm" (sel));
           return (sel);
   }
   
   static __inline uint64_t
   ridt(void)
   {
           uint64_t idtr;
           __asm __volatile("sidt %0" : "=m" (idtr));
           return (idtr);
   }
   
   static __inline u_short
   rldt(void)
   {
           u_short ldtr;
           __asm __volatile("sldt %0" : "=g" (ldtr));
           return (ldtr);
   }
   
   static __inline u_short
   rss(void)
   {
           u_short sel;
           __asm __volatile("movw %%ss,%0" : "=rm" (sel));
           return (sel);
   }
   
   static __inline u_short
   rtr(void)
   {
           u_short tr;
           __asm __volatile("str %0" : "=g" (tr));
           return (tr);
   }
   
   static __inline void
   load_fs(u_short sel)
   {
           __asm __volatile("movw %0,%%fs" : : "rm" (sel));
   }
   
   static __inline void
   load_gs(u_short sel)
   {
           __asm __volatile("movw %0,%%gs" : : "rm" (sel));
   }
   
   static __inline void
   lidt(struct region_descriptor *addr)
   {
           __asm __volatile("lidt (%0)" : : "r" (addr));
   }
   
   static __inline void
   lldt(u_short sel)
   {
           __asm __volatile("lldt %0" : : "r" (sel));
   }
   
   static __inline void
   ltr(u_short sel)
   {
           __asm __volatile("ltr %0" : : "r" (sel));
   }
   
   static __inline u_int
   rdr0(void)
   {
           u_int   data;
           __asm __volatile("movl %%dr0,%0" : "=r" (data));
           return (data);
   }
   
   static __inline void
   load_dr0(u_int dr0)
   {
           __asm __volatile("movl %0,%%dr0" : : "r" (dr0));
   }
   
   static __inline u_int
   rdr1(void)
   {
           u_int   data;
           __asm __volatile("movl %%dr1,%0" : "=r" (data));
           return (data);
   }
   
   static __inline void
   load_dr1(u_int dr1)
   {
           __asm __volatile("movl %0,%%dr1" : : "r" (dr1));
   }
   
   static __inline u_int
   rdr2(void)
   {
           u_int   data;
           __asm __volatile("movl %%dr2,%0" : "=r" (data));
           return (data);
   }
   
   static __inline void
   load_dr2(u_int dr2)
   {
           __asm __volatile("movl %0,%%dr2" : : "r" (dr2));
   }
   
   static __inline u_int
   rdr3(void)
   {
           u_int   data;
           __asm __volatile("movl %%dr3,%0" : "=r" (data));
           return (data);
   }
   
   static __inline void
   load_dr3(u_int dr3)
   {
           __asm __volatile("movl %0,%%dr3" : : "r" (dr3));
   }
   
   static __inline u_int
   rdr6(void)
   {
           u_int   data;
           __asm __volatile("movl %%dr6,%0" : "=r" (data));
           return (data);
   }
   
   static __inline void
   load_dr6(u_int dr6)
   {
           __asm __volatile("movl %0,%%dr6" : : "r" (dr6));
   }
   
   static __inline u_int
   rdr7(void)
   {
           u_int   data;
           __asm __volatile("movl %%dr7,%0" : "=r" (data));
           return (data);
   }
   
   static __inline void
   load_dr7(u_int dr7)
   {
           __asm __volatile("movl %0,%%dr7" : : "r" (dr7));
   }
   
   static __inline u_char
   read_cyrix_reg(u_char reg)
   {
           outb(0x22, reg);
           return inb(0x23);
   }
   
   static __inline void
   write_cyrix_reg(u_char reg, u_char data)
   {
           outb(0x22, reg);
           outb(0x23, data);
   }
   
   static __inline register_t
   intr_disable(void)
   {
           register_t eflags;
   
           eflags = read_eflags();
           disable_intr();
           return (eflags);
   }
   
   static __inline void
   intr_restore(register_t eflags)
   {
           write_eflags(eflags);
   }
   
   #else /* !(__GNUCLIKE_ASM && __CC_SUPPORTS___INLINE) */
   
   int     breakpoint(void);
   u_int   bsfl(u_int mask);
   u_int   bsrl(u_int mask);
   void    clflush(u_long addr);
   void    clts(void);
   void    cpuid_count(u_int ax, u_int cx, u_int *p);
   void    disable_intr(void);
   void    do_cpuid(u_int ax, u_int *p);
   void    enable_intr(void);
   void    halt(void);
   void    ia32_pause(void);
   u_char  inb(u_int port);
   u_int   inl(u_int port);
   void    insb(u_int port, void *addr, size_t count);
   void    insl(u_int port, void *addr, size_t count);
   void    insw(u_int port, void *addr, size_t count);
   register_t      intr_disable(void);
   void    intr_restore(register_t ef);
   void    invd(void);
   void    invlpg(u_int addr);
   void    invltlb(void);
   u_short inw(u_int port);
   void    lidt(struct region_descriptor *addr);
   void    lldt(u_short sel);
   void    load_cr0(u_int cr0);
   void    load_cr3(u_int cr3);
   void    load_cr4(u_int cr4);
   void    load_dr0(u_int dr0);
   void    load_dr1(u_int dr1);
   void    load_dr2(u_int dr2);
   void    load_dr3(u_int dr3);
   void    load_dr6(u_int dr6);
   void    load_dr7(u_int dr7);
   void    load_fs(u_short sel);
   void    load_gs(u_short sel);
   void    ltr(u_short sel);
   void    outb(u_int port, u_char data);
   void    outl(u_int port, u_int data);
   void    outsb(u_int port, const void *addr, size_t count);
   void    outsl(u_int port, const void *addr, size_t count);
   void    outsw(u_int port, const void *addr, size_t count);
   void    outw(u_int port, u_short data);
   u_int   rcr0(void);
   u_int   rcr2(void);
   u_int   rcr3(void);
   u_int   rcr4(void);
   uint64_t rdmsr(u_int msr);
   uint64_t rdpmc(u_int pmc);
   u_int   rdr0(void);
   u_int   rdr1(void);
   u_int   rdr2(void);
   u_int   rdr3(void);
   u_int   rdr6(void);
   u_int   rdr7(void);
   uint64_t rdtsc(void);
   u_char  read_cyrix_reg(u_char reg);
   u_int   read_eflags(void);
   u_int   rfs(void);
   uint64_t rgdt(void);
   u_int   rgs(void);
   uint64_t ridt(void);
   u_short rldt(void);
   u_short rtr(void);
   void    wbinvd(void);
   void    write_cyrix_reg(u_char reg, u_char data);
   void    write_eflags(u_int ef);
   void    wrmsr(u_int msr, uint64_t newval);
   
   #endif  /* __GNUCLIKE_ASM && __CC_SUPPORTS___INLINE */
   
   void    reset_dbregs(void);
   
   #ifdef _KERNEL
   int     rdmsr_safe(u_int msr, uint64_t *val);
   int     wrmsr_safe(u_int msr, uint64_t newval);
   #endif
   
   #endif /* !_MACHINE_CPUFUNC_H_ */

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