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lxdream.org :: lxdream/src/sh4/mmux86.c
lxdream 0.9.1
released Jun 29
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filename src/sh4/mmux86.c
changeset 939:6f2302afeb89
next940:81e0d3051d5f
author nkeynes
date Sat Jan 03 03:30:26 2009 +0000 (12 years ago)
branchlxdream-mem
permissions -rw-r--r--
last change MMU work-in-progress
* Move SDRAM out into separate sdram.c
* Move all page-table management into mmu.c
* Convert UTLB management to use the new page-tables
* Rip out all calls to mmu_vma_to_phys_* and replace with direct access
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     1 /**
     2  * $Id: mmux86.c 957 2008-12-27 03:14:59Z nkeynes $
     3  * 
     4  * x86-specific MMU code - this emits simple TLB stubs for TLB indirection.
     5   *
     6  * Copyright (c) 2008 Nathan Keynes.
     7  *
     8  * This program is free software; you can redistribute it and/or modify
     9  * it under the terms of the GNU General Public License as published by
    10  * the Free Software Foundation; either version 2 of the License, or
    11  * (at your option) any later version.
    12  *
    13  * This program is distributed in the hope that it will be useful,
    14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    16  * GNU General Public License for more details.
    17  */
    19 #include "lxdream.h"
    20 #include "mem.h"
    21 #include "sh4/sh4core.h"
    22 #include "sh4/sh4mmio.h"
    23 #include "sh4/sh4trans.h"
    24 #include "sh4/mmu.h"
    25 #include "sh4/x86op.h"
    27 #if SIZEOF_VOID_P == 8
    28 #define ARG1 R_EDI
    29 #define ARG2 R_ESI
    30 #define DECODE() \
    31     MOV_imm64_r32((uintptr_t)ext_address_space, R_EAX);     /* movq ptr, %rax */ \
    32     REXW(); OP(0x8B); OP(0x0C); OP(0xC8)                    /* movq [%rax + %rcx*8], %rcx */
    33 #else
    34 #define ARG1 R_EAX
    35 #define ARG2 R_EDX
    36 #define DECODE() \
    37     MOV_r32disp32x4_r32( R_ECX, (uintptr_t)ext_address_space, R_ECX );
    38 #endif
    40 void mmu_utlb_init_vtable( struct utlb_entry *ent, struct utlb_page_entry *page, gboolean writable )
    41 {
    42     uint32_t mask = ent->mask;
    43     uint32_t ppn = ent->ppn & mask;
    44     int inc = writable ? 1 : 2; 
    45     int i;
    47     xlat_output = page->code;
    48     uint8_t **fn = (uint8_t **)ext_address_space[ppn>>12];
    49     uint8_t **out = (uint8_t **)&page->fn;
    51     for( i=0; i<8; i+= inc, fn += inc, out += inc ) {
    52         *out = xlat_output;
    53 #if SIZEOF_VOID_P == 8
    54         MOV_imm64_r32((uintptr_t)&mmu_urc, R_EAX );
    55         OP(0x83); OP(0x00); OP(0x01); // ADD #1, [RAX]
    56 #else 
    57         OP(0x83); MODRM_r32_disp32(0, (uintptr_t)&mmu_urc); OP(0x01); // ADD #1, mmu_urc
    58 #endif
    59         AND_imm32_r32( ~mask, ARG1 ); // 6
    60         OR_imm32_r32( ppn, ARG1 );    // 6
    61         if( ent->mask >= 0xFFFFF000 ) {
    62             // Maps to a single page, so jump directly there
    63             int rel = (*fn - xlat_output);
    64             JMP_rel( rel ); // 5
    65         } else {
    66             MOV_r32_r32( ARG1, R_ECX ); // 2
    67             SHR_imm8_r32( 12, R_ECX );  // 3
    68             DECODE();                   // 14
    69             JMP_r32disp8(R_ECX, (((uintptr_t)out) - ((uintptr_t)&page->fn)) );    // 3
    70         }
    71     }
    72 }
    74 void mmu_utlb_1k_init_vtable( struct utlb_1k_entry *entry )
    75 {
    76     xlat_output = entry->code;
    77     int i;
    78     uint8_t **out = (uint8_t **)&entry->fn;
    80     for( i=0; i<8; i++, out++ ) {
    81         *out = xlat_output;
    82         MOV_r32_r32( ARG1, R_ECX );
    83         SHR_imm8_r32( 10, R_ECX );
    84         AND_imm8s_r32( 0x3, R_ECX );
    85 #if SIZEOF_VOID_P == 8
    86         MOV_imm64_r32( (uintptr_t)&entry->subpages[0], R_EAX );
    87         REXW(); OP(0x8B); OP(0x0C); OP(0xC8);                   /* movq [%rax + %rcx*8], %rcx */
    88 #else
    89         MOV_r32disp32x4_r32( R_ECX, ((uintptr_t)&entry->subpages[0]), R_ECX );
    90 #endif                
    91         JMP_r32disp8(R_ECX, (((uintptr_t)out) - ((uintptr_t)&entry->fn)) );    // 3
    92     }
    94     out = (uint8_t **)&entry->user_fn;
    95     for( i=0; i<8; i++, out++ ) {
    96         *out = xlat_output;
    97         MOV_r32_r32( ARG1, R_ECX );
    98         SHR_imm8_r32( 10, R_ECX );
    99         AND_imm8s_r32( 0x3, R_ECX );
   100 #if SIZEOF_VOID_P == 8
   101         MOV_imm64_r32( (uintptr_t)&entry->user_subpages[0], R_EAX );
   102         REXW(); OP(0x8B); OP(0x0C); OP(0xC8);                   /* movq [%rax + %rcx*8], %rcx */
   103 #else
   104         MOV_r32disp32x4_r32( R_ECX, ((uintptr_t)&entry->user_subpages[0]), R_ECX );
   105 #endif                
   106         JMP_r32disp8(R_ECX, (((uintptr_t)out) - ((uintptr_t)&entry->user_fn)) );    // 3
   107     }
   109 }
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