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 2.1 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 #include "fpu/softfloat-helpers.h"
  23 #include "qemu/qemu-print.h"
  24
  25 enum {
  26     TLBRET_DIRTY = -4,
  27     TLBRET_INVALID = -3,
  28     TLBRET_NOMATCH = -2,
  29     TLBRET_BADADDR = -1,
  30     TLBRET_MATCH = 0
  31 };
  32
  33 #if defined(CONFIG_SOFTMMU)
  34 static int get_physical_address(CPUTriCoreState *env, hwaddr *physical,
  35                                 int *prot, target_ulong address,
  36                                 int rw, int access_type)
  37 {
  38     int ret = TLBRET_MATCH;
  39
  40     *physical = address & 0xFFFFFFFF;
  41     *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
  42
  43     return ret;
  44 }
  45 #endif
  46
  47 /* TODO: Add exeption support*/
  48 static void raise_mmu_exception(CPUTriCoreState *env, target_ulong address,
  49                                 int rw, int tlb_error)
  50 {
  51 }
  52
  53 bool tricore_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
  54                           MMUAccessType rw, int mmu_idx,
  55                           bool probe, uintptr_t retaddr)
  56 {
  57     TriCoreCPU *cpu = TRICORE_CPU(cs);
  58     CPUTriCoreState *env = &cpu->env;
  59     hwaddr physical;
  60     int prot;
  61     int access_type;
  62     int ret = 0;
  63
  64     rw &= 1;
  65     access_type = ACCESS_INT;
  66     ret = get_physical_address(env, &physical, &prot,
  67                                address, rw, access_type);
  68
  69     qemu_log_mask(CPU_LOG_MMU, "%s address=" TARGET_FMT_lx " ret %d physical "
  70                   TARGET_FMT_plx " prot %d\n",
  71                   __func__, (target_ulong)address, ret, physical, prot);
  72
  73     if (ret == TLBRET_MATCH) {
  74         tlb_set_page(cs, address & TARGET_PAGE_MASK,
  75                      physical & TARGET_PAGE_MASK, prot | PAGE_EXEC,
  76                      mmu_idx, TARGET_PAGE_SIZE);
  77         return true;
  78     } else {
  79         assert(ret < 0);
  80         if (probe) {
  81             return false;
  82         }
  83         raise_mmu_exception(env, address, rw, ret);
  84         cpu_loop_exit_restore(cs, retaddr);
  85     }
  86 }
  87
  88 static void tricore_cpu_list_entry(gpointer data, gpointer user_data)
  89 {
  90     ObjectClass *oc = data;
  91     const char *typename;
  92     char *name;
  93
  94     typename = object_class_get_name(oc);
  95     name = g_strndup(typename, strlen(typename) - strlen("-" TYPE_TRICORE_CPU));
  96     qemu_printf("  %s\n", name);
  97     g_free(name);
  98 }
  99
 100 void tricore_cpu_list(void)
 101 {
 102     GSList *list;
 103
 104     list = object_class_get_list_sorted(TYPE_TRICORE_CPU, false);
 105     qemu_printf("Available CPUs:\n");
 106     g_slist_foreach(list, tricore_cpu_list_entry, NULL);
 107     g_slist_free(list);
 108 }
 109
 110 void fpu_set_state(CPUTriCoreState *env)
 111 {
 112     set_float_rounding_mode(env->PSW & MASK_PSW_FPU_RM, &env->fp_status);
 113     set_flush_inputs_to_zero(1, &env->fp_status);
 114     set_flush_to_zero(1, &env->fp_status);
 115     set_default_nan_mode(1, &env->fp_status);
 116 }
 117
 118 uint32_t psw_read(CPUTriCoreState *env)
 119 {
 120     /* clear all USB bits */
 121     env->PSW &= 0x6ffffff;
 122     /* now set them from the cache */
 123     env->PSW |= ((env->PSW_USB_C != 0) << 31);
 124     env->PSW |= ((env->PSW_USB_V   & (1 << 31))  >> 1);
 125     env->PSW |= ((env->PSW_USB_SV  & (1 << 31))  >> 2);
 126     env->PSW |= ((env->PSW_USB_AV  & (1 << 31))  >> 3);
 127     env->PSW |= ((env->PSW_USB_SAV & (1 << 31))  >> 4);
 128
 129     return env->PSW;
 130 }
 131
 132 void psw_write(CPUTriCoreState *env, uint32_t val)
 133 {
 134     env->PSW_USB_C = (val & MASK_USB_C);
 135     env->PSW_USB_V = (val & MASK_USB_V) << 1;
 136     env->PSW_USB_SV = (val & MASK_USB_SV) << 2;
 137     env->PSW_USB_AV = (val & MASK_USB_AV) << 3;
 138     env->PSW_USB_SAV = (val & MASK_USB_SAV) << 4;
 139     env->PSW = val;
 140
 141     fpu_set_state(env);
 142 }