LXR qemu/target/tricore/helper.c

   1/*
   2 *  Copyright (c) 2012-2014 Bastian Koppelmann C-Lab/University Paderborn
   3 *
   4 * This library is free software; you can redistribute it and/or
   5 * modify it under the terms of the GNU Lesser General Public
   6 * License as published by the Free Software Foundation; either
   7 * version 2 of the License, or (at your option) any later version.
   8 *
   9 * This library is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 * Lesser General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU Lesser General Public
  15 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18#include "qemu/osdep.h"
  19
  20#include "cpu.h"
  21#include "exec/exec-all.h"
  22
  23enum {
  24    TLBRET_DIRTY = -4,
  25    TLBRET_INVALID = -3,
  26    TLBRET_NOMATCH = -2,
  27    TLBRET_BADADDR = -1,
  28    TLBRET_MATCH = 0
  29};
  30
  31#if defined(CONFIG_SOFTMMU)
  32static int get_physical_address(CPUTriCoreState *env, hwaddr *physical,
  33                                int *prot, target_ulong address,
  34                                int rw, int access_type)
  35{
  36    int ret = TLBRET_MATCH;
  37
  38    *physical = address & 0xFFFFFFFF;
  39    *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
  40
  41    return ret;
  42}
  43#endif
  44
  45/* TODO: Add exeption support*/
  46static void raise_mmu_exception(CPUTriCoreState *env, target_ulong address,
  47                                int rw, int tlb_error)
  48{
  49}
  50
  51int cpu_tricore_handle_mmu_fault(CPUState *cs, target_ulong address,
  52                                 int rw, int mmu_idx)
  53{
  54    TriCoreCPU *cpu = TRICORE_CPU(cs);
  55    CPUTriCoreState *env = &cpu->env;
  56    hwaddr physical;
  57    int prot;
  58    int access_type;
  59    int ret = 0;
  60
  61    rw &= 1;
  62    access_type = ACCESS_INT;
  63    ret = get_physical_address(env, &physical, &prot,
  64                               address, rw, access_type);
  65    qemu_log_mask(CPU_LOG_MMU, "%s address=" TARGET_FMT_lx " ret %d physical " TARGET_FMT_plx
  66                  " prot %d\n", __func__, address, ret, physical, prot);
  67
  68    if (ret == TLBRET_MATCH) {
  69        tlb_set_page(cs, address & TARGET_PAGE_MASK,
  70                     physical & TARGET_PAGE_MASK, prot | PAGE_EXEC,
  71                     mmu_idx, TARGET_PAGE_SIZE);
  72        ret = 0;
  73    } else if (ret < 0) {
  74        raise_mmu_exception(env, address, rw, ret);
  75        ret = 1;
  76    }
  77
  78    return ret;
  79}
  80
  81static void tricore_cpu_list_entry(gpointer data, gpointer user_data)
  82{
  83    ObjectClass *oc = data;
  84    CPUListState *s = user_data;
  85    const char *typename;
  86    char *name;
  87
  88    typename = object_class_get_name(oc);
  89    name = g_strndup(typename, strlen(typename) - strlen("-" TYPE_TRICORE_CPU));
  90    (*s->cpu_fprintf)(s->file, "  %s\n",
  91                      name);
  92    g_free(name);
  93}
  94
  95void tricore_cpu_list(FILE *f, fprintf_function cpu_fprintf)
  96{
  97    CPUListState s = {
  98        .file = f,
  99        .cpu_fprintf = cpu_fprintf,
 100    };
 101    GSList *list;
 102
 103    list = object_class_get_list(TYPE_TRICORE_CPU, false);
 104    (*cpu_fprintf)(f, "Available CPUs:\n");
 105    g_slist_foreach(list, tricore_cpu_list_entry, &s);
 106    g_slist_free(list);
 107}
 108
 109void fpu_set_state(CPUTriCoreState *env)
 110{
 111    set_float_rounding_mode(env->PSW & MASK_PSW_FPU_RM, &env->fp_status);
 112    set_flush_inputs_to_zero(1, &env->fp_status);
 113    set_flush_to_zero(1, &env->fp_status);
 114    set_default_nan_mode(1, &env->fp_status);
 115}
 116
 117uint32_t psw_read(CPUTriCoreState *env)
 118{
 119    /* clear all USB bits */
 120    env->PSW &= 0x6ffffff;
 121    /* now set them from the cache */
 122    env->PSW |= ((env->PSW_USB_C != 0) << 31);
 123    env->PSW |= ((env->PSW_USB_V   & (1 << 31))  >> 1);
 124    env->PSW |= ((env->PSW_USB_SV  & (1 << 31))  >> 2);
 125    env->PSW |= ((env->PSW_USB_AV  & (1 << 31))  >> 3);
 126    env->PSW |= ((env->PSW_USB_SAV & (1 << 31))  >> 4);
 127
 128    return env->PSW;
 129}
 130
 131void psw_write(CPUTriCoreState *env, uint32_t val)
 132{
 133    env->PSW_USB_C = (val & MASK_USB_C);
 134    env->PSW_USB_V = (val & MASK_USB_V) << 1;
 135    env->PSW_USB_SV = (val & MASK_USB_SV) << 2;
 136    env->PSW_USB_AV = (val & MASK_USB_AV) << 3;
 137    env->PSW_USB_SAV = (val & MASK_USB_SAV) << 4;
 138    env->PSW = val;
 139
 140    fpu_set_state(env);
 141}
 142