root / target-sh4 / helper.c @ 43dc2a64
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/*
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* SH4 emulation
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*
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* Copyright (c) 2005 Samuel Tardieu
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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, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdarg.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <inttypes.h> |
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#include <signal.h> |
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|
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#include "cpu.h" |
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#include "exec-all.h" |
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#include "hw/sh_intc.h" |
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|
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#if defined(CONFIG_USER_ONLY)
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void do_interrupt (CPUState *env)
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{
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env->exception_index = -1;
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} |
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|
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int cpu_sh4_handle_mmu_fault(CPUState * env, target_ulong address, int rw, |
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int mmu_idx, int is_softmmu) |
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{
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env->tea = address; |
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env->exception_index = -1;
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switch (rw) {
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case 0: |
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env->exception_index = 0x0a0;
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break;
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case 1: |
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env->exception_index = 0x0c0;
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break;
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case 2: |
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env->exception_index = 0x0a0;
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break;
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} |
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return 1; |
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} |
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|
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int cpu_sh4_is_cached(CPUSH4State * env, target_ulong addr)
|
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{
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/* For user mode, only U0 area is cachable. */
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return !(addr & 0x80000000); |
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} |
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|
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#else /* !CONFIG_USER_ONLY */ |
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|
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#define MMU_OK 0 |
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#define MMU_ITLB_MISS (-1) |
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#define MMU_ITLB_MULTIPLE (-2) |
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#define MMU_ITLB_VIOLATION (-3) |
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#define MMU_DTLB_MISS_READ (-4) |
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#define MMU_DTLB_MISS_WRITE (-5) |
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#define MMU_DTLB_INITIAL_WRITE (-6) |
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#define MMU_DTLB_VIOLATION_READ (-7) |
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#define MMU_DTLB_VIOLATION_WRITE (-8) |
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#define MMU_DTLB_MULTIPLE (-9) |
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#define MMU_DTLB_MISS (-10) |
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#define MMU_IADDR_ERROR (-11) |
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#define MMU_DADDR_ERROR_READ (-12) |
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#define MMU_DADDR_ERROR_WRITE (-13) |
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|
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void do_interrupt(CPUState * env)
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{
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int do_irq = env->interrupt_request & CPU_INTERRUPT_HARD;
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int do_exp, irq_vector = env->exception_index;
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|
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/* prioritize exceptions over interrupts */
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|
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do_exp = env->exception_index != -1;
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do_irq = do_irq && (env->exception_index == -1);
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|
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if (env->sr & SR_BL) {
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if (do_exp && env->exception_index != 0x1e0) { |
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env->exception_index = 0x000; /* masked exception -> reset */ |
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} |
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if (do_irq && !env->intr_at_halt) {
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return; /* masked */ |
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} |
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env->intr_at_halt = 0;
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} |
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|
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if (do_irq) {
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irq_vector = sh_intc_get_pending_vector(env->intc_handle, |
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(env->sr >> 4) & 0xf); |
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if (irq_vector == -1) { |
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return; /* masked */ |
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} |
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} |
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|
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if (qemu_loglevel_mask(CPU_LOG_INT)) {
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const char *expname; |
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switch (env->exception_index) {
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case 0x0e0: |
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expname = "addr_error";
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break;
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case 0x040: |
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expname = "tlb_miss";
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break;
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case 0x0a0: |
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expname = "tlb_violation";
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break;
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case 0x180: |
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expname = "illegal_instruction";
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break;
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case 0x1a0: |
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expname = "slot_illegal_instruction";
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break;
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case 0x800: |
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expname = "fpu_disable";
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break;
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case 0x820: |
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expname = "slot_fpu";
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break;
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case 0x100: |
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expname = "data_write";
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break;
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case 0x060: |
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expname = "dtlb_miss_write";
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break;
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case 0x0c0: |
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expname = "dtlb_violation_write";
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break;
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case 0x120: |
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expname = "fpu_exception";
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break;
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case 0x080: |
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expname = "initial_page_write";
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break;
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case 0x160: |
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expname = "trapa";
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break;
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default:
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expname = do_irq ? "interrupt" : "???"; |
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break;
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} |
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qemu_log("exception 0x%03x [%s] raised\n",
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irq_vector, expname); |
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log_cpu_state(env, 0);
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} |
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env->ssr = env->sr; |
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env->spc = env->pc; |
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env->sgr = env->gregs[15];
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env->sr |= SR_BL | SR_MD | SR_RB; |
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|
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if (env->flags & (DELAY_SLOT | DELAY_SLOT_CONDITIONAL)) {
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/* Branch instruction should be executed again before delay slot. */
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env->spc -= 2;
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/* Clear flags for exception/interrupt routine. */
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env->flags &= ~(DELAY_SLOT | DELAY_SLOT_CONDITIONAL | DELAY_SLOT_TRUE); |
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} |
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if (env->flags & DELAY_SLOT_CLEARME)
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env->flags = 0;
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|
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if (do_exp) {
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env->expevt = env->exception_index; |
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switch (env->exception_index) {
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case 0x000: |
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case 0x020: |
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case 0x140: |
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env->sr &= ~SR_FD; |
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env->sr |= 0xf << 4; /* IMASK */ |
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env->pc = 0xa0000000;
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break;
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case 0x040: |
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case 0x060: |
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env->pc = env->vbr + 0x400;
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break;
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case 0x160: |
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env->spc += 2; /* special case for TRAPA */ |
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/* fall through */
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default:
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env->pc = env->vbr + 0x100;
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break;
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} |
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return;
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} |
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|
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if (do_irq) {
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env->intevt = irq_vector; |
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env->pc = env->vbr + 0x600;
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return;
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} |
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} |
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|
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static void update_itlb_use(CPUState * env, int itlbnb) |
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{
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uint8_t or_mask = 0, and_mask = (uint8_t) - 1; |
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switch (itlbnb) {
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case 0: |
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and_mask = 0x1f;
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break;
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case 1: |
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and_mask = 0xe7;
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or_mask = 0x80;
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break;
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case 2: |
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and_mask = 0xfb;
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or_mask = 0x50;
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break;
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case 3: |
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or_mask = 0x2c;
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break;
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} |
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|
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env->mmucr &= (and_mask << 24) | 0x00ffffff; |
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env->mmucr |= (or_mask << 24);
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} |
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|
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static int itlb_replacement(CPUState * env) |
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{
|
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if ((env->mmucr & 0xe0000000) == 0xe0000000) |
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return 0; |
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if ((env->mmucr & 0x98000000) == 0x18000000) |
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return 1; |
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if ((env->mmucr & 0x54000000) == 0x04000000) |
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return 2; |
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if ((env->mmucr & 0x2c000000) == 0x00000000) |
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return 3; |
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cpu_abort(env, "Unhandled itlb_replacement");
|
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} |
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|
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/* Find the corresponding entry in the right TLB
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Return entry, MMU_DTLB_MISS or MMU_DTLB_MULTIPLE
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*/
|
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static int find_tlb_entry(CPUState * env, target_ulong address, |
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tlb_t * entries, uint8_t nbtlb, int use_asid)
|
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{
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int match = MMU_DTLB_MISS;
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uint32_t start, end; |
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uint8_t asid; |
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int i;
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|
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asid = env->pteh & 0xff;
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|
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for (i = 0; i < nbtlb; i++) { |
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if (!entries[i].v)
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continue; /* Invalid entry */ |
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if (!entries[i].sh && use_asid && entries[i].asid != asid)
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continue; /* Bad ASID */ |
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start = (entries[i].vpn << 10) & ~(entries[i].size - 1); |
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end = start + entries[i].size - 1;
|
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if (address >= start && address <= end) { /* Match */ |
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if (match != MMU_DTLB_MISS)
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return MMU_DTLB_MULTIPLE; /* Multiple match */ |
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match = i; |
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} |
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} |
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return match;
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} |
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|
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static void increment_urc(CPUState * env) |
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{
|
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uint8_t urb, urc; |
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|
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/* Increment URC */
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urb = ((env->mmucr) >> 18) & 0x3f; |
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urc = ((env->mmucr) >> 10) & 0x3f; |
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urc++; |
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if ((urb > 0 && urc > urb) || urc > (UTLB_SIZE - 1)) |
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urc = 0;
|
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env->mmucr = (env->mmucr & 0xffff03ff) | (urc << 10); |
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} |
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|
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/* Find itlb entry - update itlb from utlb if necessary and asked for
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Return entry, MMU_ITLB_MISS, MMU_ITLB_MULTIPLE or MMU_DTLB_MULTIPLE
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Update the itlb from utlb if update is not 0
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*/
|
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static int find_itlb_entry(CPUState * env, target_ulong address, |
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int use_asid, int update) |
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{
|
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int e, n;
|
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|
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e = find_tlb_entry(env, address, env->itlb, ITLB_SIZE, use_asid); |
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if (e == MMU_DTLB_MULTIPLE)
|
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e = MMU_ITLB_MULTIPLE; |
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else if (e == MMU_DTLB_MISS && update) { |
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e = find_tlb_entry(env, address, env->utlb, UTLB_SIZE, use_asid); |
| 297 |
if (e >= 0) { |
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tlb_t * ientry; |
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n = itlb_replacement(env); |
| 300 |
ientry = &env->itlb[n]; |
| 301 |
if (ientry->v) {
|
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tlb_flush_page(env, ientry->vpn << 10);
|
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} |
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*ientry = env->utlb[e]; |
| 305 |
e = n; |
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} else if (e == MMU_DTLB_MISS) |
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e = MMU_ITLB_MISS; |
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} else if (e == MMU_DTLB_MISS) |
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e = MMU_ITLB_MISS; |
| 310 |
if (e >= 0) |
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update_itlb_use(env, e); |
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return e;
|
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} |
| 314 |
|
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/* Find utlb entry
|
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Return entry, MMU_DTLB_MISS, MMU_DTLB_MULTIPLE */
|
| 317 |
static int find_utlb_entry(CPUState * env, target_ulong address, int use_asid) |
| 318 |
{
|
| 319 |
/* per utlb access */
|
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increment_urc(env); |
| 321 |
|
| 322 |
/* Return entry */
|
| 323 |
return find_tlb_entry(env, address, env->utlb, UTLB_SIZE, use_asid);
|
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} |
| 325 |
|
| 326 |
/* Match address against MMU
|
| 327 |
Return MMU_OK, MMU_DTLB_MISS_READ, MMU_DTLB_MISS_WRITE,
|
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MMU_DTLB_INITIAL_WRITE, MMU_DTLB_VIOLATION_READ,
|
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MMU_DTLB_VIOLATION_WRITE, MMU_ITLB_MISS,
|
| 330 |
MMU_ITLB_MULTIPLE, MMU_ITLB_VIOLATION,
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MMU_IADDR_ERROR, MMU_DADDR_ERROR_READ, MMU_DADDR_ERROR_WRITE.
|
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*/
|
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static int get_mmu_address(CPUState * env, target_ulong * physical, |
| 334 |
int *prot, target_ulong address,
|
| 335 |
int rw, int access_type) |
| 336 |
{
|
| 337 |
int use_asid, n;
|
| 338 |
tlb_t *matching = NULL;
|
| 339 |
|
| 340 |
use_asid = (env->mmucr & MMUCR_SV) == 0 || (env->sr & SR_MD) == 0; |
| 341 |
|
| 342 |
if (rw == 2) { |
| 343 |
n = find_itlb_entry(env, address, use_asid, 1);
|
| 344 |
if (n >= 0) { |
| 345 |
matching = &env->itlb[n]; |
| 346 |
if (!(env->sr & SR_MD) && !(matching->pr & 2)) |
| 347 |
n = MMU_ITLB_VIOLATION; |
| 348 |
else
|
| 349 |
*prot = PAGE_EXEC; |
| 350 |
} |
| 351 |
} else {
|
| 352 |
n = find_utlb_entry(env, address, use_asid); |
| 353 |
if (n >= 0) { |
| 354 |
matching = &env->utlb[n]; |
| 355 |
if (!(env->sr & SR_MD) && !(matching->pr & 2)) { |
| 356 |
n = (rw == 1) ? MMU_DTLB_VIOLATION_WRITE :
|
| 357 |
MMU_DTLB_VIOLATION_READ; |
| 358 |
} else if ((rw == 1) && !(matching->pr & 1)) { |
| 359 |
n = MMU_DTLB_VIOLATION_WRITE; |
| 360 |
} else if ((rw == 1) & !matching->d) { |
| 361 |
n = MMU_DTLB_INITIAL_WRITE; |
| 362 |
} else {
|
| 363 |
*prot = PAGE_READ; |
| 364 |
if ((matching->pr & 1) && matching->d) { |
| 365 |
*prot |= PAGE_WRITE; |
| 366 |
} |
| 367 |
} |
| 368 |
} else if (n == MMU_DTLB_MISS) { |
| 369 |
n = (rw == 1) ? MMU_DTLB_MISS_WRITE :
|
| 370 |
MMU_DTLB_MISS_READ; |
| 371 |
} |
| 372 |
} |
| 373 |
if (n >= 0) { |
| 374 |
n = MMU_OK; |
| 375 |
*physical = ((matching->ppn << 10) & ~(matching->size - 1)) | |
| 376 |
(address & (matching->size - 1));
|
| 377 |
} |
| 378 |
return n;
|
| 379 |
} |
| 380 |
|
| 381 |
static int get_physical_address(CPUState * env, target_ulong * physical, |
| 382 |
int *prot, target_ulong address,
|
| 383 |
int rw, int access_type) |
| 384 |
{
|
| 385 |
/* P1, P2 and P4 areas do not use translation */
|
| 386 |
if ((address >= 0x80000000 && address < 0xc0000000) || |
| 387 |
address >= 0xe0000000) {
|
| 388 |
if (!(env->sr & SR_MD)
|
| 389 |
&& (address < 0xe0000000 || address >= 0xe4000000)) { |
| 390 |
/* Unauthorized access in user mode (only store queues are available) */
|
| 391 |
fprintf(stderr, "Unauthorized access\n");
|
| 392 |
if (rw == 0) |
| 393 |
return MMU_DADDR_ERROR_READ;
|
| 394 |
else if (rw == 1) |
| 395 |
return MMU_DADDR_ERROR_WRITE;
|
| 396 |
else
|
| 397 |
return MMU_IADDR_ERROR;
|
| 398 |
} |
| 399 |
if (address >= 0x80000000 && address < 0xc0000000) { |
| 400 |
/* Mask upper 3 bits for P1 and P2 areas */
|
| 401 |
*physical = address & 0x1fffffff;
|
| 402 |
} else {
|
| 403 |
*physical = address; |
| 404 |
} |
| 405 |
*prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; |
| 406 |
return MMU_OK;
|
| 407 |
} |
| 408 |
|
| 409 |
/* If MMU is disabled, return the corresponding physical page */
|
| 410 |
if (!env->mmucr & MMUCR_AT) {
|
| 411 |
*physical = address & 0x1FFFFFFF;
|
| 412 |
*prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; |
| 413 |
return MMU_OK;
|
| 414 |
} |
| 415 |
|
| 416 |
/* We need to resort to the MMU */
|
| 417 |
return get_mmu_address(env, physical, prot, address, rw, access_type);
|
| 418 |
} |
| 419 |
|
| 420 |
int cpu_sh4_handle_mmu_fault(CPUState * env, target_ulong address, int rw, |
| 421 |
int mmu_idx, int is_softmmu) |
| 422 |
{
|
| 423 |
target_ulong physical; |
| 424 |
int prot, ret, access_type;
|
| 425 |
|
| 426 |
access_type = ACCESS_INT; |
| 427 |
ret = |
| 428 |
get_physical_address(env, &physical, &prot, address, rw, |
| 429 |
access_type); |
| 430 |
|
| 431 |
if (ret != MMU_OK) {
|
| 432 |
env->tea = address; |
| 433 |
switch (ret) {
|
| 434 |
case MMU_ITLB_MISS:
|
| 435 |
case MMU_DTLB_MISS_READ:
|
| 436 |
env->exception_index = 0x040;
|
| 437 |
break;
|
| 438 |
case MMU_DTLB_MULTIPLE:
|
| 439 |
case MMU_ITLB_MULTIPLE:
|
| 440 |
env->exception_index = 0x140;
|
| 441 |
break;
|
| 442 |
case MMU_ITLB_VIOLATION:
|
| 443 |
env->exception_index = 0x0a0;
|
| 444 |
break;
|
| 445 |
case MMU_DTLB_MISS_WRITE:
|
| 446 |
env->exception_index = 0x060;
|
| 447 |
break;
|
| 448 |
case MMU_DTLB_INITIAL_WRITE:
|
| 449 |
env->exception_index = 0x080;
|
| 450 |
break;
|
| 451 |
case MMU_DTLB_VIOLATION_READ:
|
| 452 |
env->exception_index = 0x0a0;
|
| 453 |
break;
|
| 454 |
case MMU_DTLB_VIOLATION_WRITE:
|
| 455 |
env->exception_index = 0x0c0;
|
| 456 |
break;
|
| 457 |
case MMU_IADDR_ERROR:
|
| 458 |
case MMU_DADDR_ERROR_READ:
|
| 459 |
env->exception_index = 0x0c0;
|
| 460 |
break;
|
| 461 |
case MMU_DADDR_ERROR_WRITE:
|
| 462 |
env->exception_index = 0x100;
|
| 463 |
break;
|
| 464 |
default:
|
| 465 |
cpu_abort(env, "Unhandled MMU fault");
|
| 466 |
} |
| 467 |
return 1; |
| 468 |
} |
| 469 |
|
| 470 |
address &= TARGET_PAGE_MASK; |
| 471 |
physical &= TARGET_PAGE_MASK; |
| 472 |
|
| 473 |
tlb_set_page(env, address, physical, prot, mmu_idx, TARGET_PAGE_SIZE); |
| 474 |
return 0; |
| 475 |
} |
| 476 |
|
| 477 |
target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr) |
| 478 |
{
|
| 479 |
target_ulong physical; |
| 480 |
int prot;
|
| 481 |
|
| 482 |
get_physical_address(env, &physical, &prot, addr, 0, 0); |
| 483 |
return physical;
|
| 484 |
} |
| 485 |
|
| 486 |
void cpu_load_tlb(CPUSH4State * env)
|
| 487 |
{
|
| 488 |
int n = cpu_mmucr_urc(env->mmucr);
|
| 489 |
tlb_t * entry = &env->utlb[n]; |
| 490 |
|
| 491 |
if (entry->v) {
|
| 492 |
/* Overwriting valid entry in utlb. */
|
| 493 |
target_ulong address = entry->vpn << 10;
|
| 494 |
tlb_flush_page(env, address); |
| 495 |
} |
| 496 |
|
| 497 |
/* Take values into cpu status from registers. */
|
| 498 |
entry->asid = (uint8_t)cpu_pteh_asid(env->pteh); |
| 499 |
entry->vpn = cpu_pteh_vpn(env->pteh); |
| 500 |
entry->v = (uint8_t)cpu_ptel_v(env->ptel); |
| 501 |
entry->ppn = cpu_ptel_ppn(env->ptel); |
| 502 |
entry->sz = (uint8_t)cpu_ptel_sz(env->ptel); |
| 503 |
switch (entry->sz) {
|
| 504 |
case 0: /* 00 */ |
| 505 |
entry->size = 1024; /* 1K */ |
| 506 |
break;
|
| 507 |
case 1: /* 01 */ |
| 508 |
entry->size = 1024 * 4; /* 4K */ |
| 509 |
break;
|
| 510 |
case 2: /* 10 */ |
| 511 |
entry->size = 1024 * 64; /* 64K */ |
| 512 |
break;
|
| 513 |
case 3: /* 11 */ |
| 514 |
entry->size = 1024 * 1024; /* 1M */ |
| 515 |
break;
|
| 516 |
default:
|
| 517 |
cpu_abort(env, "Unhandled load_tlb");
|
| 518 |
break;
|
| 519 |
} |
| 520 |
entry->sh = (uint8_t)cpu_ptel_sh(env->ptel); |
| 521 |
entry->c = (uint8_t)cpu_ptel_c(env->ptel); |
| 522 |
entry->pr = (uint8_t)cpu_ptel_pr(env->ptel); |
| 523 |
entry->d = (uint8_t)cpu_ptel_d(env->ptel); |
| 524 |
entry->wt = (uint8_t)cpu_ptel_wt(env->ptel); |
| 525 |
entry->sa = (uint8_t)cpu_ptea_sa(env->ptea); |
| 526 |
entry->tc = (uint8_t)cpu_ptea_tc(env->ptea); |
| 527 |
} |
| 528 |
|
| 529 |
void cpu_sh4_invalidate_tlb(CPUSH4State *s)
|
| 530 |
{
|
| 531 |
int i;
|
| 532 |
|
| 533 |
/* UTLB */
|
| 534 |
for (i = 0; i < UTLB_SIZE; i++) { |
| 535 |
tlb_t * entry = &s->utlb[i]; |
| 536 |
entry->v = 0;
|
| 537 |
} |
| 538 |
/* ITLB */
|
| 539 |
for (i = 0; i < UTLB_SIZE; i++) { |
| 540 |
tlb_t * entry = &s->utlb[i]; |
| 541 |
entry->v = 0;
|
| 542 |
} |
| 543 |
|
| 544 |
tlb_flush(s, 1);
|
| 545 |
} |
| 546 |
|
| 547 |
void cpu_sh4_write_mmaped_utlb_addr(CPUSH4State *s, target_phys_addr_t addr,
|
| 548 |
uint32_t mem_value) |
| 549 |
{
|
| 550 |
int associate = addr & 0x0000080; |
| 551 |
uint32_t vpn = (mem_value & 0xfffffc00) >> 10; |
| 552 |
uint8_t d = (uint8_t)((mem_value & 0x00000200) >> 9); |
| 553 |
uint8_t v = (uint8_t)((mem_value & 0x00000100) >> 8); |
| 554 |
uint8_t asid = (uint8_t)(mem_value & 0x000000ff);
|
| 555 |
int use_asid = (s->mmucr & MMUCR_SV) == 0 || (s->sr & SR_MD) == 0; |
| 556 |
|
| 557 |
if (associate) {
|
| 558 |
int i;
|
| 559 |
tlb_t * utlb_match_entry = NULL;
|
| 560 |
int needs_tlb_flush = 0; |
| 561 |
|
| 562 |
/* search UTLB */
|
| 563 |
for (i = 0; i < UTLB_SIZE; i++) { |
| 564 |
tlb_t * entry = &s->utlb[i]; |
| 565 |
if (!entry->v)
|
| 566 |
continue;
|
| 567 |
|
| 568 |
if (entry->vpn == vpn
|
| 569 |
&& (!use_asid || entry->asid == asid || entry->sh)) {
|
| 570 |
if (utlb_match_entry) {
|
| 571 |
/* Multiple TLB Exception */
|
| 572 |
s->exception_index = 0x140;
|
| 573 |
s->tea = addr; |
| 574 |
break;
|
| 575 |
} |
| 576 |
if (entry->v && !v)
|
| 577 |
needs_tlb_flush = 1;
|
| 578 |
entry->v = v; |
| 579 |
entry->d = d; |
| 580 |
utlb_match_entry = entry; |
| 581 |
} |
| 582 |
increment_urc(s); /* per utlb access */
|
| 583 |
} |
| 584 |
|
| 585 |
/* search ITLB */
|
| 586 |
for (i = 0; i < ITLB_SIZE; i++) { |
| 587 |
tlb_t * entry = &s->itlb[i]; |
| 588 |
if (entry->vpn == vpn
|
| 589 |
&& (!use_asid || entry->asid == asid || entry->sh)) {
|
| 590 |
if (entry->v && !v)
|
| 591 |
needs_tlb_flush = 1;
|
| 592 |
if (utlb_match_entry)
|
| 593 |
*entry = *utlb_match_entry; |
| 594 |
else
|
| 595 |
entry->v = v; |
| 596 |
break;
|
| 597 |
} |
| 598 |
} |
| 599 |
|
| 600 |
if (needs_tlb_flush)
|
| 601 |
tlb_flush_page(s, vpn << 10);
|
| 602 |
|
| 603 |
} else {
|
| 604 |
int index = (addr & 0x00003f00) >> 8; |
| 605 |
tlb_t * entry = &s->utlb[index]; |
| 606 |
if (entry->v) {
|
| 607 |
/* Overwriting valid entry in utlb. */
|
| 608 |
target_ulong address = entry->vpn << 10;
|
| 609 |
tlb_flush_page(s, address); |
| 610 |
} |
| 611 |
entry->asid = asid; |
| 612 |
entry->vpn = vpn; |
| 613 |
entry->d = d; |
| 614 |
entry->v = v; |
| 615 |
increment_urc(s); |
| 616 |
} |
| 617 |
} |
| 618 |
|
| 619 |
int cpu_sh4_is_cached(CPUSH4State * env, target_ulong addr)
|
| 620 |
{
|
| 621 |
int n;
|
| 622 |
int use_asid = (env->mmucr & MMUCR_SV) == 0 || (env->sr & SR_MD) == 0; |
| 623 |
|
| 624 |
/* check area */
|
| 625 |
if (env->sr & SR_MD) {
|
| 626 |
/* For previledged mode, P2 and P4 area is not cachable. */
|
| 627 |
if ((0xA0000000 <= addr && addr < 0xC0000000) || 0xE0000000 <= addr) |
| 628 |
return 0; |
| 629 |
} else {
|
| 630 |
/* For user mode, only U0 area is cachable. */
|
| 631 |
if (0x80000000 <= addr) |
| 632 |
return 0; |
| 633 |
} |
| 634 |
|
| 635 |
/*
|
| 636 |
* TODO : Evaluate CCR and check if the cache is on or off.
|
| 637 |
* Now CCR is not in CPUSH4State, but in SH7750State.
|
| 638 |
* When you move the ccr inot CPUSH4State, the code will be
|
| 639 |
* as follows.
|
| 640 |
*/
|
| 641 |
#if 0
|
| 642 |
/* check if operand cache is enabled or not. */
|
| 643 |
if (!(env->ccr & 1))
|
| 644 |
return 0;
|
| 645 |
#endif
|
| 646 |
|
| 647 |
/* if MMU is off, no check for TLB. */
|
| 648 |
if (env->mmucr & MMUCR_AT)
|
| 649 |
return 1; |
| 650 |
|
| 651 |
/* check TLB */
|
| 652 |
n = find_tlb_entry(env, addr, env->itlb, ITLB_SIZE, use_asid); |
| 653 |
if (n >= 0) |
| 654 |
return env->itlb[n].c;
|
| 655 |
|
| 656 |
n = find_tlb_entry(env, addr, env->utlb, UTLB_SIZE, use_asid); |
| 657 |
if (n >= 0) |
| 658 |
return env->utlb[n].c;
|
| 659 |
|
| 660 |
return 0; |
| 661 |
} |
| 662 |
|
| 663 |
#endif
|