786c02f1ac
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4056 c046a42c-6fe2-441c-8c8c-71466251a162
268 lines
6.3 KiB
C
268 lines
6.3 KiB
C
/*
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* CRIS mmu emulation.
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*
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* Copyright (c) 2007 AXIS Communications AB
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* Written by Edgar E. Iglesias.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef CONFIG_USER_ONLY
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "config.h"
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#include "cpu.h"
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#include "mmu.h"
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#include "exec-all.h"
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#define D(x)
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static int cris_mmu_enabled(uint32_t rw_gc_cfg)
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{
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return (rw_gc_cfg & 12) != 0;
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}
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static int cris_mmu_segmented_addr(int seg, uint32_t rw_mm_cfg)
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{
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return (1 << seg) & rw_mm_cfg;
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}
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static uint32_t cris_mmu_translate_seg(CPUState *env, int seg)
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{
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uint32_t base;
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int i;
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if (seg < 8)
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base = env->sregs[SFR_RW_MM_KBASE_LO];
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else
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base = env->sregs[SFR_RW_MM_KBASE_HI];
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i = seg & 7;
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base >>= i * 4;
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base &= 15;
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base <<= 28;
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return base;
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}
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/* Used by the tlb decoder. */
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#define EXTRACT_FIELD(src, start, end) \
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(((src) >> start) & ((1 << (end - start + 1)) - 1))
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static inline void set_field(uint32_t *dst, unsigned int val,
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unsigned int offset, unsigned int width)
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{
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uint32_t mask;
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mask = (1 << width) - 1;
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mask <<= offset;
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val <<= offset;
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val &= mask;
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D(printf ("val=%x mask=%x dst=%x\n", val, mask, *dst));
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*dst &= ~(mask);
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*dst |= val;
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}
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static int cris_mmu_translate_page(struct cris_mmu_result_t *res,
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CPUState *env, uint32_t vaddr,
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int rw, int usermode)
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{
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unsigned int vpage;
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unsigned int idx;
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uint32_t lo, hi;
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uint32_t tlb_vpn, tlb_pfn = 0;
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int tlb_pid, tlb_g, tlb_v, tlb_k, tlb_w, tlb_x;
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int cfg_v, cfg_k, cfg_w, cfg_x;
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int i, match = 0;
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uint32_t r_cause;
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uint32_t r_cfg;
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int rwcause;
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int update_sel = 0;
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r_cause = env->sregs[SFR_R_MM_CAUSE];
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r_cfg = env->sregs[SFR_RW_MM_CFG];
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rwcause = rw ? CRIS_MMU_ERR_WRITE : CRIS_MMU_ERR_READ;
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vpage = vaddr >> 13;
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idx = vpage & 15;
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/* We know the index which to check on each set.
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Scan both I and D. */
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#if 0
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for (i = 0; i < 4; i++) {
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int j;
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for (j = 0; j < 16; j++) {
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lo = env->tlbsets[1][i][j].lo;
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hi = env->tlbsets[1][i][j].hi;
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tlb_vpn = EXTRACT_FIELD(hi, 13, 31);
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tlb_pfn = EXTRACT_FIELD(lo, 13, 31);
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printf ("TLB: [%d][%d] hi=%x lo=%x v=%x p=%x\n",
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i, j, hi, lo, tlb_vpn, tlb_pfn);
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}
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}
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#endif
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for (i = 0; i < 4; i++)
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{
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lo = env->tlbsets[1][i][idx].lo;
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hi = env->tlbsets[1][i][idx].hi;
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tlb_vpn = EXTRACT_FIELD(hi, 13, 31);
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tlb_pfn = EXTRACT_FIELD(lo, 13, 31);
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D(printf ("TLB[%d][%d] tlbv=%x vpage=%x -> pfn=%x\n",
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i, idx, tlb_vpn, vpage, tlb_pfn));
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if (tlb_vpn == vpage) {
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match = 1;
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break;
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}
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}
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if (match) {
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cfg_w = EXTRACT_FIELD(r_cfg, 19, 19);
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cfg_k = EXTRACT_FIELD(r_cfg, 18, 18);
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cfg_x = EXTRACT_FIELD(r_cfg, 17, 17);
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cfg_v = EXTRACT_FIELD(r_cfg, 16, 16);
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tlb_pid = EXTRACT_FIELD(hi, 0, 7);
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tlb_pfn = EXTRACT_FIELD(lo, 13, 31);
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tlb_g = EXTRACT_FIELD(lo, 4, 4);
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tlb_v = EXTRACT_FIELD(lo, 3, 3);
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tlb_k = EXTRACT_FIELD(lo, 2, 2);
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tlb_w = EXTRACT_FIELD(lo, 1, 1);
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tlb_x = EXTRACT_FIELD(lo, 0, 0);
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/*
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set_exception_vector(0x04, i_mmu_refill);
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set_exception_vector(0x05, i_mmu_invalid);
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set_exception_vector(0x06, i_mmu_access);
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set_exception_vector(0x07, i_mmu_execute);
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set_exception_vector(0x08, d_mmu_refill);
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set_exception_vector(0x09, d_mmu_invalid);
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set_exception_vector(0x0a, d_mmu_access);
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set_exception_vector(0x0b, d_mmu_write);
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*/
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if (cfg_v && !tlb_v) {
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printf ("tlb: invalid\n");
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set_field(&r_cause, rwcause, 8, 9);
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match = 0;
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res->bf_vec = 0x9;
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update_sel = 1;
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}
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else if (!tlb_g
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&& tlb_pid != 0xff
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&& tlb_pid != env->pregs[PR_PID]
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&& cfg_w && !tlb_w) {
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printf ("tlb: wrong pid\n");
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match = 0;
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res->bf_vec = 0xa;
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}
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else if (rw && cfg_w && !tlb_w) {
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printf ("tlb: write protected\n");
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match = 0;
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res->bf_vec = 0xb;
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}
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} else
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update_sel = 1;
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if (update_sel) {
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/* miss. */
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env->sregs[SFR_RW_MM_TLB_SEL] = 0;
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D(printf ("tlb: miss %x vp=%x\n",
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env->sregs[SFR_RW_MM_TLB_SEL], vpage & 15));
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set_field(&env->sregs[SFR_RW_MM_TLB_SEL], vpage & 15, 0, 4);
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set_field(&env->sregs[SFR_RW_MM_TLB_SEL], 0, 4, 5);
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res->bf_vec = 0x8;
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}
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if (!match) {
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set_field(&r_cause, rwcause, 8, 9);
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set_field(&r_cause, vpage, 13, 19);
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set_field(&r_cause, env->pregs[PR_PID], 0, 8);
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env->sregs[SFR_R_MM_CAUSE] = r_cause;
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}
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D(printf ("%s mtch=%d pc=%x va=%x vpn=%x tlbvpn=%x pfn=%x pid=%x"
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" %x cause=%x sel=%x r13=%x\n",
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__func__, match, env->pc,
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vaddr, vpage,
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tlb_vpn, tlb_pfn, tlb_pid,
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env->pregs[PR_PID],
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r_cause,
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env->sregs[SFR_RW_MM_TLB_SEL],
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env->regs[13]));
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res->pfn = tlb_pfn;
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return !match;
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}
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/* Give us the vaddr corresponding to the latest TLB update. */
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target_ulong cris_mmu_tlb_latest_update(CPUState *env, uint32_t new_lo)
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{
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uint32_t sel = env->sregs[SFR_RW_MM_TLB_SEL];
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uint32_t vaddr;
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uint32_t hi;
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int set;
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int idx;
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idx = EXTRACT_FIELD(sel, 0, 4);
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set = EXTRACT_FIELD(sel, 4, 5);
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hi = env->tlbsets[1][set][idx].hi;
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vaddr = EXTRACT_FIELD(hi, 13, 31);
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return vaddr << TARGET_PAGE_BITS;
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}
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int cris_mmu_translate(struct cris_mmu_result_t *res,
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CPUState *env, uint32_t vaddr,
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int rw, int mmu_idx)
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{
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uint32_t phy = vaddr;
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int seg;
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int miss = 0;
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int is_user = mmu_idx == MMU_USER_IDX;
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if (!cris_mmu_enabled(env->sregs[SFR_RW_GC_CFG])) {
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res->phy = vaddr;
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return 0;
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}
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seg = vaddr >> 28;
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if (cris_mmu_segmented_addr(seg, env->sregs[SFR_RW_MM_CFG]))
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{
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uint32_t base;
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miss = 0;
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base = cris_mmu_translate_seg(env, seg);
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phy = base | (0x0fffffff & vaddr);
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res->phy = phy;
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}
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else
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{
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miss = cris_mmu_translate_page(res, env, vaddr, rw, is_user);
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if (!miss) {
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phy &= 8191;
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phy |= (res->pfn << 13);
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res->phy = phy;
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}
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}
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D(printf ("miss=%d v=%x -> p=%x\n", miss, vaddr, phy));
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return miss;
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}
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#endif
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