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Annotation of qemu/target-cris/mmu.c, revision 1.1.1.1

1.1       root        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 mmu_idx)
                    115: {
                    116:        uint32_t phy = vaddr;
                    117:        int seg;
                    118:        int miss = 0;
                    119:         int is_user = mmu_idx == MMU_USER_IDX;
                    120: 
                    121:        if (!cris_mmu_enabled(env->sregs[SFR_RW_GC_CFG])) {
                    122:                res->phy = vaddr;
                    123:                return 0;
                    124:        }
                    125: 
                    126:        seg = vaddr >> 28;
                    127:        if (cris_mmu_segmented_addr(seg, env->sregs[SFR_RW_MM_CFG]))
                    128:        {
                    129:                uint32_t base;
                    130: 
                    131:                miss = 0;
                    132:                base = cris_mmu_translate_seg(env, seg);
                    133:                phy = base | (0x0fffffff & vaddr);
                    134:                res->phy = phy;
                    135:        }
                    136:        else
                    137:        {
                    138:                miss = cris_mmu_translate_page(res, env, vaddr, rw, is_user);
                    139:                if (!miss) {
                    140:                        phy &= 8191;
                    141:                        phy |= (res->pfn << 13);
                    142:                        res->phy = phy;
                    143:                }
                    144:        }
                    145: //     printf ("miss=%d v=%x -> p=%x\n", miss, vaddr, phy);
                    146:        return miss;
                    147: }
                    148: #endif

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