helper.c
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/*
* CRIS helper routines.
*
* Copyright (c) 2007 AXIS Communications AB
* Written by Edgar E. Iglesias.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <string.h>
#include "config.h"
#include "cpu.h"
#include "mmu.h"
#include "exec-all.h"
#if defined(CONFIG_USER_ONLY)
void do_interrupt (CPUState *env)
{
env->exception_index = -1;
}
int cpu_cris_handle_mmu_fault(CPUState * env, target_ulong address, int rw,
int mmu_idx, int is_softmmu)
{
env->exception_index = 0xaa;
env->debug1 = address;
cpu_dump_state(env, stderr, fprintf, 0);
printf("%s addr=%x env->pc=%x\n", __func__, address, env->pc);
return 1;
}
target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
{
return addr;
}
#else /* !CONFIG_USER_ONLY */
int cpu_cris_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
int mmu_idx, int is_softmmu)
{
struct cris_mmu_result_t res;
int prot, miss;
target_ulong phy;
address &= TARGET_PAGE_MASK;
prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
// printf ("%s pc=%x %x w=%d smmu=%d\n", __func__, env->pc, address, rw, is_softmmu);
miss = cris_mmu_translate(&res, env, address, rw, mmu_idx);
if (miss)
{
/* handle the miss. */
phy = 0;
env->exception_index = EXCP_MMU_MISS;
}
else
{
phy = res.phy;
}
// printf ("a=%x phy=%x\n", address, phy);
return tlb_set_page(env, address, phy, prot, mmu_idx, is_softmmu);
}
static void cris_shift_ccs(CPUState *env)
{
uint32_t ccs;
/* Apply the ccs shift. */
ccs = env->pregs[SR_CCS];
ccs = (ccs & 0xc0000000) | ((ccs << 12) >> 2);
// printf ("ccs=%x %x\n", env->pregs[SR_CCS], ccs);
env->pregs[SR_CCS] = ccs;
}
void do_interrupt(CPUState *env)
{
uint32_t ebp, isr;
int irqnum;
fflush(NULL);
#if 0
printf ("exception index=%d interrupt_req=%d\n",
env->exception_index,
env->interrupt_request);
#endif
switch (env->exception_index)
{
case EXCP_BREAK:
// printf ("BREAK! %d\n", env->trapnr);
irqnum = env->trapnr;
ebp = env->pregs[SR_EBP];
isr = ldl_code(ebp + irqnum * 4);
env->pregs[SR_ERP] = env->pc + 2;
env->pc = isr;
cris_shift_ccs(env);
break;
case EXCP_MMU_MISS:
// printf ("MMU miss\n");
irqnum = 4;
ebp = env->pregs[SR_EBP];
isr = ldl_code(ebp + irqnum * 4);
env->pregs[SR_ERP] = env->pc;
env->pc = isr;
cris_shift_ccs(env);
break;
default:
{
/* Maybe the irq was acked by sw before we got a
change to take it. */
if (env->interrupt_request & CPU_INTERRUPT_HARD) {
if (!env->pending_interrupts)
return;
if (!(env->pregs[SR_CCS] & I_FLAG)) {
return;
}
irqnum = 31 -
__builtin_clz(env->pending_interrupts);
irqnum += 0x30;
ebp = env->pregs[SR_EBP];
isr = ldl_code(ebp + irqnum * 4);
env->pregs[SR_ERP] = env->pc;
env->pc = isr;
cris_shift_ccs(env);
#if 0
printf ("%s ebp=%x %x isr=%x %d"
" ir=%x pending=%x\n",
__func__,
ebp, ebp + irqnum * 4,
isr, env->exception_index,
env->interrupt_request,
env->pending_interrupts);
#endif
}
}
break;
}
}
target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
{
// printf ("%s\n", __func__);
uint32_t phy = addr;
struct cris_mmu_result_t res;
int miss;
miss = cris_mmu_translate(&res, env, addr, 0, 0);
if (!miss)
phy = res.phy;
return phy;
}
#endif