hw/spapr_rtas.c

   1 /*
   2  * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
   3  *
   4  * Hypercall based emulated RTAS
   5  *
   6  * Copyright (c) 2010-2011 David Gibson, IBM Corporation.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  *
  26  */
  27 #include "cpu.h"
  28 #include "sysemu.h"
  29 #include "qemu-char.h"
  30 #include "hw/qdev.h"
  31 #include "device_tree.h"
  32
  33 #include "hw/spapr.h"
  34 #include "hw/spapr_vio.h"
  35
  36 #include <libfdt.h>
  37
  38 #define TOKEN_BASE      0x2000
  39 #define TOKEN_MAX       0x100
  40
  41 static void rtas_display_character(sPAPREnvironment *spapr,
  42                                    uint32_t token, uint32_t nargs,
  43                                    target_ulong args,
  44                                    uint32_t nret, target_ulong rets)
  45 {
  46     uint8_t c = rtas_ld(args, 0);
  47     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, 0);
  48
  49     if (!sdev) {
  50         rtas_st(rets, 0, -1);
  51     } else {
  52         vty_putchars(sdev, &c, sizeof(c));
  53         rtas_st(rets, 0, 0);
  54     }
  55 }
  56
  57 static void rtas_get_time_of_day(sPAPREnvironment *spapr,
  58                                  uint32_t token, uint32_t nargs,
  59                                  target_ulong args,
  60                                  uint32_t nret, target_ulong rets)
  61 {
  62     struct tm tm;
  63
  64     if (nret != 8) {
  65         rtas_st(rets, 0, -3);
  66         return;
  67     }
  68
  69     qemu_get_timedate(&tm, 0);
  70
  71     rtas_st(rets, 0, 0); /* Success */
  72     rtas_st(rets, 1, tm.tm_year + 1900);
  73     rtas_st(rets, 2, tm.tm_mon + 1);
  74     rtas_st(rets, 3, tm.tm_mday);
  75     rtas_st(rets, 4, tm.tm_hour);
  76     rtas_st(rets, 5, tm.tm_min);
  77     rtas_st(rets, 6, tm.tm_sec);
  78     rtas_st(rets, 7, 0); /* we don't do nanoseconds */
  79 }
  80
  81 static void rtas_power_off(sPAPREnvironment *spapr,
  82                            uint32_t token, uint32_t nargs, target_ulong args,
  83                            uint32_t nret, target_ulong rets)
  84 {
  85     if (nargs != 2 || nret != 1) {
  86         rtas_st(rets, 0, -3);
  87         return;
  88     }
  89     qemu_system_shutdown_request();
  90     rtas_st(rets, 0, 0);
  91 }
  92
  93 static struct rtas_call {
  94     const char *name;
  95     spapr_rtas_fn fn;
  96 } rtas_table[TOKEN_MAX];
  97
  98 struct rtas_call *rtas_next = rtas_table;
  99
 100 target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
 101                              uint32_t token, uint32_t nargs, target_ulong args,
 102                              uint32_t nret, target_ulong rets)
 103 {
 104     if ((token >= TOKEN_BASE)
 105         && ((token - TOKEN_BASE) < TOKEN_MAX)) {
 106         struct rtas_call *call = rtas_table + (token - TOKEN_BASE);
 107
 108         if (call->fn) {
 109             call->fn(spapr, token, nargs, args, nret, rets);
 110             return H_SUCCESS;
 111         }
 112     }
 113
 114     /* HACK: Some Linux early debug code uses RTAS display-character,
 115      * but assumes the token value is 0xa (which it is on some real
 116      * machines) without looking it up in the device tree.  This
 117      * special case makes this work */
 118     if (token == 0xa) {
 119         rtas_display_character(spapr, 0xa, nargs, args, nret, rets);
 120         return H_SUCCESS;
 121     }
 122
 123     hcall_dprintf("Unknown RTAS token 0x%x\n", token);
 124     rtas_st(rets, 0, -3);
 125     return H_PARAMETER;
 126 }
 127
 128 void spapr_rtas_register(const char *name, spapr_rtas_fn fn)
 129 {
 130     assert(rtas_next < (rtas_table + TOKEN_MAX));
 131
 132     rtas_next->name = name;
 133     rtas_next->fn = fn;
 134
 135     rtas_next++;
 136 }
 137
 138 int spapr_rtas_device_tree_setup(void *fdt, target_phys_addr_t rtas_addr,
 139                                  target_phys_addr_t rtas_size)
 140 {
 141     int ret;
 142     int i;
 143
 144     ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
 145     if (ret < 0) {
 146         fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
 147                 fdt_strerror(ret));
 148         return ret;
 149     }
 150
 151     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base",
 152                                     rtas_addr);
 153     if (ret < 0) {
 154         fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
 155                 fdt_strerror(ret));
 156         return ret;
 157     }
 158
 159     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
 160                                     rtas_addr);
 161     if (ret < 0) {
 162         fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
 163                 fdt_strerror(ret));
 164         return ret;
 165     }
 166
 167     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size",
 168                                     rtas_size);
 169     if (ret < 0) {
 170         fprintf(stderr, "Couldn't add rtas-size property: %s\n",
 171                 fdt_strerror(ret));
 172         return ret;
 173     }
 174
 175     for (i = 0; i < TOKEN_MAX; i++) {
 176         struct rtas_call *call = &rtas_table[i];
 177
 178         if (!call->fn) {
 179             continue;
 180         }
 181
 182         ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name,
 183                                         i + TOKEN_BASE);
 184         if (ret < 0) {
 185             fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
 186                     call->name, fdt_strerror(ret));
 187             return ret;
 188         }
 189
 190     }
 191     return 0;
 192 }
 193
 194 static void register_core_rtas(void)
 195 {
 196     spapr_rtas_register("display-character", rtas_display_character);
 197     spapr_rtas_register("get-time-of-day", rtas_get_time_of_day);
 198     spapr_rtas_register("power-off", rtas_power_off);
 199 }
 200 device_init(register_core_rtas);