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 #include "qemu/log.h"
  20 #include "hw/registerfields.h"
  21 #include "cpu.h"
  22 #include "exec/exec-all.h"
  23 #include "fpu/softfloat-helpers.h"
  24 #include "qemu/qemu-print.h"
  25
  26 enum {
  27     TLBRET_DIRTY = -4,
  28     TLBRET_INVALID = -3,
  29     TLBRET_NOMATCH = -2,
  30     TLBRET_BADADDR = -1,
  31     TLBRET_MATCH = 0
  32 };
  33
  34 static int get_physical_address(CPUTriCoreState *env, hwaddr *physical,
  35                                 int *prot, target_ulong address,
  36                                 MMUAccessType access_type, int mmu_idx)
  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
  46 hwaddr tricore_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
  47 {
  48     TriCoreCPU *cpu = TRICORE_CPU(cs);
  49     hwaddr phys_addr;
  50     int prot;
  51     int mmu_idx = cpu_mmu_index(cs, false);
  52
  53     if (get_physical_address(&cpu->env, &phys_addr, &prot, addr,
  54                              MMU_DATA_LOAD, mmu_idx)) {
  55         return -1;
  56     }
  57     return phys_addr;
  58 }
  59
  60 /* TODO: Add exception support */
  61 static void raise_mmu_exception(CPUTriCoreState *env, target_ulong address,
  62                                 int rw, int tlb_error)
  63 {
  64 }
  65
  66 bool tricore_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
  67                           MMUAccessType rw, int mmu_idx,
  68                           bool probe, uintptr_t retaddr)
  69 {
  70     CPUTriCoreState *env = cpu_env(cs);
  71     hwaddr physical;
  72     int prot;
  73     int ret = 0;
  74
  75     rw &= 1;
  76     ret = get_physical_address(env, &physical, &prot,
  77                                address, rw, mmu_idx);
  78
  79     qemu_log_mask(CPU_LOG_MMU, "%s address=0x%" VADDR_PRIx " ret %d physical "
  80                   HWADDR_FMT_plx " prot %d\n",
  81                   __func__, address, ret, physical, prot);
  82
  83     if (ret == TLBRET_MATCH) {
  84         tlb_set_page(cs, address & TARGET_PAGE_MASK,
  85                      physical & TARGET_PAGE_MASK, prot | PAGE_EXEC,
  86                      mmu_idx, TARGET_PAGE_SIZE);
  87         return true;
  88     } else {
  89         assert(ret < 0);
  90         if (probe) {
  91             return false;
  92         }
  93         raise_mmu_exception(env, address, rw, ret);
  94         cpu_loop_exit_restore(cs, retaddr);
  95     }
  96 }
  97
  98 void fpu_set_state(CPUTriCoreState *env)
  99 {
 100     switch (extract32(env->PSW, 24, 2)) {
 101     case 0:
 102         set_float_rounding_mode(float_round_nearest_even, &env->fp_status);
 103         break;
 104     case 1:
 105         set_float_rounding_mode(float_round_up, &env->fp_status);
 106         break;
 107     case 2:
 108         set_float_rounding_mode(float_round_down, &env->fp_status);
 109         break;
 110     case 3:
 111         set_float_rounding_mode(float_round_to_zero, &env->fp_status);
 112         break;
 113     }
 114
 115     set_flush_inputs_to_zero(1, &env->fp_status);
 116     set_flush_to_zero(1, &env->fp_status);
 117     set_float_detect_tininess(float_tininess_before_rounding, &env->fp_status);
 118     set_default_nan_mode(1, &env->fp_status);
 119 }
 120
 121 uint32_t psw_read(CPUTriCoreState *env)
 122 {
 123     /* clear all USB bits */
 124     env->PSW &= 0x7ffffff;
 125     /* now set them from the cache */
 126     env->PSW |= ((env->PSW_USB_C != 0) << 31);
 127     env->PSW |= ((env->PSW_USB_V   & (1 << 31))  >> 1);
 128     env->PSW |= ((env->PSW_USB_SV  & (1 << 31))  >> 2);
 129     env->PSW |= ((env->PSW_USB_AV  & (1 << 31))  >> 3);
 130     env->PSW |= ((env->PSW_USB_SAV & (1 << 31))  >> 4);
 131
 132     return env->PSW;
 133 }
 134
 135 void psw_write(CPUTriCoreState *env, uint32_t val)
 136 {
 137     env->PSW_USB_C = (val & MASK_USB_C);
 138     env->PSW_USB_V = (val & MASK_USB_V) << 1;
 139     env->PSW_USB_SV = (val & MASK_USB_SV) << 2;
 140     env->PSW_USB_AV = (val & MASK_USB_AV) << 3;
 141     env->PSW_USB_SAV = (val & MASK_USB_SAV) << 4;
 142     env->PSW = val;
 143
 144     fpu_set_state(env);
 145 }
 146
 147 #define FIELD_GETTER_WITH_FEATURE(NAME, REG, FIELD, FEATURE)     \
 148 uint32_t NAME(CPUTriCoreState *env)                             \
 149 {                                                                \
 150     if (tricore_has_feature(env, TRICORE_FEATURE_##FEATURE)) {   \
 151         return FIELD_EX32(env->REG, REG, FIELD ## _ ## FEATURE); \
 152     }                                                            \
 153     return FIELD_EX32(env->REG, REG, FIELD ## _13);              \
 154 }
 155
 156 #define FIELD_GETTER(NAME, REG, FIELD)       \
 157 uint32_t NAME(CPUTriCoreState *env)         \
 158 {                                            \
 159     return FIELD_EX32(env->REG, REG, FIELD); \
 160 }
 161
 162 #define FIELD_SETTER_WITH_FEATURE(NAME, REG, FIELD, FEATURE)              \
 163 void NAME(CPUTriCoreState *env, uint32_t val)                            \
 164 {                                                                         \
 165     if (tricore_has_feature(env, TRICORE_FEATURE_##FEATURE)) {            \
 166         env->REG = FIELD_DP32(env->REG, REG, FIELD ## _ ## FEATURE, val); \
 167     }                                                                     \
 168     env->REG = FIELD_DP32(env->REG, REG, FIELD ## _13, val);              \
 169 }
 170
 171 #define FIELD_SETTER(NAME, REG, FIELD)                \
 172 void NAME(CPUTriCoreState *env, uint32_t val)        \
 173 {                                                     \
 174     env->REG = FIELD_DP32(env->REG, REG, FIELD, val); \
 175 }
 176
 177 FIELD_GETTER_WITH_FEATURE(pcxi_get_pcpn, PCXI, PCPN, 161)
 178 FIELD_SETTER_WITH_FEATURE(pcxi_set_pcpn, PCXI, PCPN, 161)
 179 FIELD_GETTER_WITH_FEATURE(pcxi_get_pie, PCXI, PIE, 161)
 180 FIELD_SETTER_WITH_FEATURE(pcxi_set_pie, PCXI, PIE, 161)
 181 FIELD_GETTER_WITH_FEATURE(pcxi_get_ul, PCXI, UL, 161)
 182 FIELD_SETTER_WITH_FEATURE(pcxi_set_ul, PCXI, UL, 161)
 183 FIELD_GETTER(pcxi_get_pcxs, PCXI, PCXS)
 184 FIELD_GETTER(pcxi_get_pcxo, PCXI, PCXO)
 185
 186 FIELD_GETTER_WITH_FEATURE(icr_get_ie, ICR, IE, 161)
 187 FIELD_SETTER_WITH_FEATURE(icr_set_ie, ICR, IE, 161)
 188 FIELD_GETTER(icr_get_ccpn, ICR, CCPN)
 189 FIELD_SETTER(icr_set_ccpn, ICR, CCPN)