gwj / at91sam9263 · Commits

Commit 94cff60a0219eecd83a1fbd20a8db7e527322674

Authored by ths
1 parent 81fdc5f8

CRIS MMU emulation, by Edgar E. Iglesias. 


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3362 c046a42c-6fe2-441c-8c8c-71466251a162
Inline Side-by-side
Showing 2 changed files with 167 additions and 0 deletions
target-cris/mmu.c 0 → 100644
  View file @94cff60
  1 +/*
  2 + * CRIS mmu emulation.
  3 + *
  4 + * Copyright (c) 2007 AXIS Communications AB
  5 + * Written by Edgar E. Iglesias.
  6 + *
  7 + * This library is free software; you can redistribute it and/or
  8 + * modify it under the terms of the GNU Lesser General Public
  9 + * License as published by the Free Software Foundation; either
  10 + * version 2 of the License, or (at your option) any later version.
  11 + *
  12 + * This library is distributed in the hope that it will be useful,
  13 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15 + * Lesser General Public License for more details.
  16 + *
  17 + * You should have received a copy of the GNU Lesser General Public
  18 + * License along with this library; if not, write to the Free Software
  19 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20 + */
  21 +
  22 +#ifndef CONFIG_USER_ONLY
  23 +
  24 +#include <stdio.h>
  25 +#include <string.h>
  26 +#include <stdlib.h>
  27 +
  28 +#include "config.h"
  29 +#include "cpu.h"
  30 +#include "mmu.h"
  31 +#include "exec-all.h"
  32 +
  33 +
  34 +static int cris_mmu_enabled(uint32_t rw_gc_cfg)
  35 +{
  36 + return (rw_gc_cfg & 12) != 0;
  37 +}
  38 +
  39 +static int cris_mmu_segmented_addr(int seg, uint32_t rw_mm_cfg)
  40 +{
  41 + return (1 << seg) & rw_mm_cfg;
  42 +}
  43 +
  44 +static uint32_t cris_mmu_translate_seg(CPUState *env, int seg)
  45 +{
  46 + uint32_t base;
  47 + int i;
  48 +
  49 + if (seg < 8)
  50 + base = env->sregs[SFR_RW_MM_KBASE_LO];
  51 + else
  52 + base = env->sregs[SFR_RW_MM_KBASE_HI];
  53 +
  54 + i = seg & 7;
  55 + base >>= i * 4;
  56 + base &= 15;
  57 +
  58 + base <<= 28;
  59 + return base;
  60 +}
  61 +/* Used by the tlb decoder. */
  62 +#define EXTRACT_FIELD(src, start, end) \
  63 + (((src) >> start) & ((1 << (end - start + 1)) - 1))
  64 +
  65 +static int cris_mmu_translate_page(struct cris_mmu_result_t *res,
  66 + CPUState *env, uint32_t vaddr,
  67 + int rw, int usermode)
  68 +{
  69 + unsigned int vpage;
  70 + unsigned int idx;
  71 + uint32_t lo, hi;
  72 + uint32_t vpn, pfn = 0, pid, fg, fv, fk, fw, fx;
  73 + int i, match = 0;
  74 +
  75 + vpage = vaddr >> 13;
  76 + idx = vpage & 31;
  77 + vpage >>= 4;
  78 +
  79 + /* We know the index which to check on each set.
  80 + Scan both I and D. */
  81 + for (i = 0; i < 4; i++)
  82 + {
  83 + lo = env->tlbsets[0][i][idx].lo;
  84 + hi = env->tlbsets[0][i][idx].hi;
  85 +
  86 + vpn = EXTRACT_FIELD(hi, 13, 31);
  87 + pid = EXTRACT_FIELD(hi, 0, 7);
  88 +
  89 + if (vpn == vpage
  90 + && pid == env->pregs[SR_PID]) {
  91 + match = 1;
  92 + break;
  93 + }
  94 + }
  95 +
  96 + if (match) {
  97 + pfn = EXTRACT_FIELD(lo, 13, 31);
  98 + fg = EXTRACT_FIELD(lo, 4, 4);
  99 + fv = EXTRACT_FIELD(lo, 3, 3);
  100 + fk = EXTRACT_FIELD(lo, 2, 2);
  101 + fw = EXTRACT_FIELD(lo, 1, 1);
  102 + fx = EXTRACT_FIELD(lo, 0, 0);
  103 + }
  104 + printf ("%s match=%d vaddr=%x vpage=%x vpn=%x pfn=%x pid=%x %x\n",
  105 + __func__, match,
  106 + vaddr, vpage,
  107 + vpn, pfn, pid, env->pregs[SR_PID]);
  108 + res->pfn = pfn;
  109 + return !match;
  110 +}
  111 +
  112 +int cris_mmu_translate(struct cris_mmu_result_t *res,
  113 + CPUState *env, uint32_t vaddr,
  114 + int rw, int is_user)
  115 +{
  116 + uint32_t phy = vaddr;
  117 + int seg;
  118 + int miss = 0;
  119 +
  120 + if (!cris_mmu_enabled(env->sregs[SFR_RW_GC_CFG])) {
  121 + res->phy = vaddr;
  122 + return 0;
  123 + }
  124 +
  125 + seg = vaddr >> 28;
  126 + if (cris_mmu_segmented_addr(seg, env->sregs[SFR_RW_MM_CFG]))
  127 + {
  128 + uint32_t base;
  129 +
  130 + miss = 0;
  131 + base = cris_mmu_translate_seg(env, seg);
  132 + phy = base | (0x0fffffff & vaddr);
  133 + res->phy = phy;
  134 + }
  135 + else
  136 + {
  137 + miss = cris_mmu_translate_page(res, env, vaddr, rw, is_user);
  138 + if (!miss) {
  139 + phy &= 8191;
  140 + phy |= (res->pfn << 13);
  141 + res->phy = phy;
  142 + }
  143 + }
  144 +// printf ("miss=%d v=%x -> p=%x\n", miss, vaddr, phy);
  145 + return miss;
  146 +}
  147 +#endif
target-cris/mmu.h 0 → 100644
  View file @94cff60
  1 +#define CRIS_MMU_ERR_EXEC 0
  2 +#define CRIS_MMU_ERR_READ 1
  3 +#define CRIS_MMU_ERR_WRITE 2
  4 +#define CRIS_MMU_ERR_FLUSH 3
  5 +
  6 +struct cris_mmu_result_t
  7 +{
  8 + uint32_t phy;
  9 + uint32_t pfn;
  10 + int g:1;
  11 + int v:1;
  12 + int k:1;
  13 + int w:1;
  14 + int e:1;
  15 + int cause_op;
  16 +};
  17 +
  18 +int cris_mmu_translate(struct cris_mmu_result_t *res,
  19 + CPUState *env, uint32_t vaddr,
  20 + int rw, int is_user);