target/ppc/misc_helper.c

   1 /*
   2  * Miscellaneous PowerPC emulation helpers for QEMU.
   3  *
   4  *  Copyright (c) 2003-2007 Jocelyn Mayer
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include "qemu/osdep.h"
  20 #include "cpu.h"
  21 #include "exec/exec-all.h"
  22 #include "exec/helper-proto.h"
  23 #include "qemu/error-report.h"
  24
  25 #include "helper_regs.h"
  26
  27 /*****************************************************************************/
  28 /* SPR accesses */
  29 void helper_load_dump_spr(CPUPPCState *env, uint32_t sprn)
  30 {
  31     qemu_log("Read SPR %d %03x => " TARGET_FMT_lx "\n", sprn, sprn,
  32              env->spr[sprn]);
  33 }
  34
  35 void helper_store_dump_spr(CPUPPCState *env, uint32_t sprn)
  36 {
  37     qemu_log("Write SPR %d %03x <= " TARGET_FMT_lx "\n", sprn, sprn,
  38              env->spr[sprn]);
  39 }
  40
  41 #ifdef TARGET_PPC64
  42 static void raise_fu_exception(CPUPPCState *env, uint32_t bit,
  43                                uint32_t sprn, uint32_t cause,
  44                                uintptr_t raddr)
  45 {
  46     qemu_log("Facility SPR %d is unavailable (SPR FSCR:%d)\n", sprn, bit);
  47
  48     env->spr[SPR_FSCR] &= ~((target_ulong)FSCR_IC_MASK << FSCR_IC_POS);
  49     cause &= FSCR_IC_MASK;
  50     env->spr[SPR_FSCR] |= (target_ulong)cause << FSCR_IC_POS;
  51
  52     raise_exception_err_ra(env, POWERPC_EXCP_FU, 0, raddr);
  53 }
  54 #endif
  55
  56 void helper_fscr_facility_check(CPUPPCState *env, uint32_t bit,
  57                                 uint32_t sprn, uint32_t cause)
  58 {
  59 #ifdef TARGET_PPC64
  60     if (env->spr[SPR_FSCR] & (1ULL << bit)) {
  61         /* Facility is enabled, continue */
  62         return;
  63     }
  64     raise_fu_exception(env, bit, sprn, cause, GETPC());
  65 #endif
  66 }
  67
  68 void helper_msr_facility_check(CPUPPCState *env, uint32_t bit,
  69                                uint32_t sprn, uint32_t cause)
  70 {
  71 #ifdef TARGET_PPC64
  72     if (env->msr & (1ULL << bit)) {
  73         /* Facility is enabled, continue */
  74         return;
  75     }
  76     raise_fu_exception(env, bit, sprn, cause, GETPC());
  77 #endif
  78 }
  79
  80 #if !defined(CONFIG_USER_ONLY)
  81
  82 void helper_store_sdr1(CPUPPCState *env, target_ulong val)
  83 {
  84     PowerPCCPU *cpu = ppc_env_get_cpu(env);
  85
  86     if (env->spr[SPR_SDR1] != val) {
  87         ppc_store_sdr1(env, val);
  88         tlb_flush(CPU(cpu));
  89     }
  90 }
  91
  92 #if defined(TARGET_PPC64)
  93 void helper_store_ptcr(CPUPPCState *env, target_ulong val)
  94 {
  95     PowerPCCPU *cpu = ppc_env_get_cpu(env);
  96
  97     if (env->spr[SPR_PTCR] != val) {
  98         ppc_store_ptcr(env, val);
  99         tlb_flush(CPU(cpu));
 100     }
 101 }
 102
 103 void helper_store_pcr(CPUPPCState *env, target_ulong value)
 104 {
 105     PowerPCCPU *cpu = ppc_env_get_cpu(env);
 106     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
 107
 108     env->spr[SPR_PCR] = value & pcc->pcr_mask;
 109 }
 110 #endif /* defined(TARGET_PPC64) */
 111
 112 void helper_store_pidr(CPUPPCState *env, target_ulong val)
 113 {
 114     PowerPCCPU *cpu = ppc_env_get_cpu(env);
 115
 116     env->spr[SPR_BOOKS_PID] = val;
 117     tlb_flush(CPU(cpu));
 118 }
 119
 120 void helper_store_lpidr(CPUPPCState *env, target_ulong val)
 121 {
 122     PowerPCCPU *cpu = ppc_env_get_cpu(env);
 123
 124     env->spr[SPR_LPIDR] = val;
 125
 126     /*
 127      * We need to flush the TLB on LPID changes as we only tag HV vs
 128      * guest in TCG TLB. Also the quadrants means the HV will
 129      * potentially access and cache entries for the current LPID as
 130      * well.
 131      */
 132     tlb_flush(CPU(cpu));
 133 }
 134
 135 void helper_store_hid0_601(CPUPPCState *env, target_ulong val)
 136 {
 137     target_ulong hid0;
 138
 139     hid0 = env->spr[SPR_HID0];
 140     if ((val ^ hid0) & 0x00000008) {
 141         /* Change current endianness */
 142         env->hflags &= ~(1 << MSR_LE);
 143         env->hflags_nmsr &= ~(1 << MSR_LE);
 144         env->hflags_nmsr |= (1 << MSR_LE) & (((val >> 3) & 1) << MSR_LE);
 145         env->hflags |= env->hflags_nmsr;
 146         qemu_log("%s: set endianness to %c => " TARGET_FMT_lx "\n", __func__,
 147                  val & 0x8 ? 'l' : 'b', env->hflags);
 148     }
 149     env->spr[SPR_HID0] = (uint32_t)val;
 150 }
 151
 152 void helper_store_403_pbr(CPUPPCState *env, uint32_t num, target_ulong value)
 153 {
 154     PowerPCCPU *cpu = ppc_env_get_cpu(env);
 155
 156     if (likely(env->pb[num] != value)) {
 157         env->pb[num] = value;
 158         /* Should be optimized */
 159         tlb_flush(CPU(cpu));
 160     }
 161 }
 162
 163 void helper_store_40x_dbcr0(CPUPPCState *env, target_ulong val)
 164 {
 165     store_40x_dbcr0(env, val);
 166 }
 167
 168 void helper_store_40x_sler(CPUPPCState *env, target_ulong val)
 169 {
 170     store_40x_sler(env, val);
 171 }
 172 #endif
 173 /*****************************************************************************/
 174 /* PowerPC 601 specific instructions (POWER bridge) */
 175
 176 target_ulong helper_clcs(CPUPPCState *env, uint32_t arg)
 177 {
 178     switch (arg) {
 179     case 0x0CUL:
 180         /* Instruction cache line size */
 181         return env->icache_line_size;
 182         break;
 183     case 0x0DUL:
 184         /* Data cache line size */
 185         return env->dcache_line_size;
 186         break;
 187     case 0x0EUL:
 188         /* Minimum cache line size */
 189         return (env->icache_line_size < env->dcache_line_size) ?
 190             env->icache_line_size : env->dcache_line_size;
 191         break;
 192     case 0x0FUL:
 193         /* Maximum cache line size */
 194         return (env->icache_line_size > env->dcache_line_size) ?
 195             env->icache_line_size : env->dcache_line_size;
 196         break;
 197     default:
 198         /* Undefined */
 199         return 0;
 200         break;
 201     }
 202 }
 203
 204 /*****************************************************************************/
 205 /* Special registers manipulation */
 206
 207 /* GDBstub can read and write MSR... */
 208 void ppc_store_msr(CPUPPCState *env, target_ulong value)
 209 {
 210     hreg_store_msr(env, value, 0);
 211 }
 212
 213 /* This code is lifted from MacOnLinux. It is called whenever
 214  * THRM1,2 or 3 is read an fixes up the values in such a way
 215  * that will make MacOS not hang. These registers exist on some
 216  * 75x and 74xx processors.
 217  */
 218 void helper_fixup_thrm(CPUPPCState *env)
 219 {
 220     target_ulong v, t;
 221     int i;
 222
 223 #define THRM1_TIN       (1 << 31)
 224 #define THRM1_TIV       (1 << 30)
 225 #define THRM1_THRES(x)  (((x) & 0x7f) << 23)
 226 #define THRM1_TID       (1 << 2)
 227 #define THRM1_TIE       (1 << 1)
 228 #define THRM1_V         (1 << 0)
 229 #define THRM3_E         (1 << 0)
 230
 231     if (!(env->spr[SPR_THRM3] & THRM3_E)) {
 232         return;
 233     }
 234
 235     /* Note: Thermal interrupts are unimplemented */
 236     for (i = SPR_THRM1; i <= SPR_THRM2; i++) {
 237         v = env->spr[i];
 238         if (!(v & THRM1_V)) {
 239             continue;
 240         }
 241         v |= THRM1_TIV;
 242         v &= ~THRM1_TIN;
 243         t = v & THRM1_THRES(127);
 244         if ((v & THRM1_TID) && t < THRM1_THRES(24)) {
 245             v |= THRM1_TIN;
 246         }
 247         if (!(v & THRM1_TID) && t > THRM1_THRES(24)) {
 248             v |= THRM1_TIN;
 249         }
 250         env->spr[i] = v;
 251     }
 252 }