FreeBSD/Linux Kernel Cross Reference
sys/mips/nlm/hal/mmu.h

     /*-
      * Copyright 2003-2011 Netlogic Microsystems (Netlogic). 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.
     *
     * THIS SOFTWARE IS PROVIDED BY Netlogic Microsystems ``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 NETLOGIC 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.
     *
     * NETLOGIC_BSD
     * $FreeBSD$
     */
    
    #ifndef __XLP_MMU_H__
    #define __XLP_MMU_H__
    
    #include <mips/nlm/hal/mips-extns.h>
    
    static __inline__ uint32_t
    nlm_read_c0_config6(void)
    {
            uint32_t rv;
    
            __asm__ __volatile__ (
                    ".set   push\n"
                    ".set   mips64\n"
                    "mfc0   %0, $16, 6\n"
                    ".set   pop\n" 
                    : "=r" (rv));
    
            return rv;
    }
    
    static __inline__ void
    nlm_write_c0_config6(uint32_t value)
    {
            __asm__ __volatile__ (
                    ".set   push\n"
                    ".set   mips64\n"
                    "mtc0   %0, $16, 6\n"
                    ".set   pop\n" 
                    : : "r" (value));
    }
    
    static __inline__ uint32_t
    nlm_read_c0_config7(void)
    {
            uint32_t rv;
    
            __asm__ __volatile__ (
                    ".set   push\n"
                    ".set   mips64\n"
                    "mfc0   %0, $16, 7\n"
                    ".set   pop\n" 
                    : "=r" (rv));
    
            return rv;
    }
    
    static __inline__ void
    nlm_write_c0_config7(uint32_t value)
    {
            __asm__ __volatile__ (
                    ".set   push\n"
                    ".set   mips64\n"
                    "mtc0   %0, $16, 7\n"
                    ".set   pop\n" 
                    : : "r" (value));
    }
    /**
     * On power on reset, XLP comes up with 64 TLBs.
     * Large-variable-tlb's (ELVT) and extended TLB is disabled.
     * Enabling large-variable-tlb's sets up the standard
     * TLB size from 64 to 128 TLBs.
     * Enabling fixed TLB (EFT) sets up an additional 2048 tlbs.
     * ELVT + EFT = 128 + 2048 = 2176 TLB entries.
     * threads  64-entry-standard-tlb    128-entry-standard-tlb
     * per      std-tlb-only| std+EFT  | std-tlb-only| std+EFT
     * core                 |          |             |
     * --------------------------------------------------------
     * 1         64           64+2048     128          128+2048
    * 2         64           64+1024      64           64+1024
    * 4         32           32+512       32           32+512
    *
    * 1(G)      64           64+2048     128          128+2048
    * 2(G)      128         128+2048     128          128+2048
    * 4(G)      128         128+2048     128          128+2048
    * (G) = Global mode
    */
   
   
   /* en = 1 to enable
    * en = 0 to disable
    */
   static __inline__ void nlm_large_variable_tlb_en (int en)
   {
           unsigned int val;
   
           val = nlm_read_c0_config6();
           val |= (en << 5);
           nlm_write_c0_config6(val);
           return;
   }
   
   /* en = 1 to enable
    * en = 0 to disable
    */
   static __inline__ void nlm_pagewalker_en(int en)
   {
           unsigned int val;
   
           val = nlm_read_c0_config6();
           val |= (en << 3);
           nlm_write_c0_config6(val);
           return;
   }
   
   /* en = 1 to enable
    * en = 0 to disable
    */
   static __inline__ void nlm_extended_tlb_en(int en)
   {
           unsigned int val;
   
           val = nlm_read_c0_config6();
           val |= (en << 2);
           nlm_write_c0_config6(val);
           return;
   }
   
   static __inline__ int nlm_get_num_combined_tlbs(void)
   {
           return (((nlm_read_c0_config6() >> 16) & 0xffff) + 1);
   }
   
   /* get number of variable TLB entries */
   static __inline__ int nlm_get_num_vtlbs(void)
   {
           return (((nlm_read_c0_config6() >> 6) & 0x3ff) + 1);
   }
   
   static __inline__ void nlm_setup_extended_pagemask(int mask)
   {
           nlm_write_c0_config7(mask);
   }
   
   #endif

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