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 2.1 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.h"
  23#include "qemu/qemu-print.h"
  24
  25enum {
  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)
  34static 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*/
  48static void raise_mmu_exception(CPUTriCoreState *env, target_ulong address,
  49                                int rw, int tlb_error)
  50{
  51}
  52
  53bool 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
  88static 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
 100void 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
 110void 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
 118uint32_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
 132void 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}
 143