/* * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator * * Hypercall based emulated RTAS * * Copyright (c) 2010-2011 David Gibson, IBM Corporation. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. * */ #include "cpu.h" #include "sysemu.h" #include "qemu-char.h" #include "hw/qdev.h" #include "device_tree.h" #include "hw/spapr.h" #include "hw/spapr_vio.h" #include <libfdt.h> #define TOKEN_BASE 0x2000 #define TOKEN_MAX 0x100 static void rtas_display_character(sPAPREnvironment *spapr, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { uint8_t c = rtas_ld(args, 0); VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, SPAPR_VTY_BASE_ADDRESS); if (!sdev) { rtas_st(rets, 0, -1); } else { vty_putchars(sdev, &c, sizeof(c)); rtas_st(rets, 0, 0); } } static void rtas_get_time_of_day(sPAPREnvironment *spapr, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { struct tm tm; if (nret != 8) { rtas_st(rets, 0, -3); return; } qemu_get_timedate(&tm, 0); rtas_st(rets, 0, 0); /* Success */ rtas_st(rets, 1, tm.tm_year + 1900); rtas_st(rets, 2, tm.tm_mon + 1); rtas_st(rets, 3, tm.tm_mday); rtas_st(rets, 4, tm.tm_hour); rtas_st(rets, 5, tm.tm_min); rtas_st(rets, 6, tm.tm_sec); rtas_st(rets, 7, 0); /* we don't do nanoseconds */ } static void rtas_power_off(sPAPREnvironment *spapr, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { if (nargs != 2 || nret != 1) { rtas_st(rets, 0, -3); return; } qemu_system_shutdown_request(); rtas_st(rets, 0, 0); } static void rtas_query_cpu_stopped_state(sPAPREnvironment *spapr, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { target_ulong id; CPUState *env; if (nargs != 1 || nret != 2) { rtas_st(rets, 0, -3); return; } id = rtas_ld(args, 0); for (env = first_cpu; env; env = env->next_cpu) { if (env->cpu_index != id) { continue; } if (env->halted) { rtas_st(rets, 1, 0); } else { rtas_st(rets, 1, 2); } rtas_st(rets, 0, 0); return; } /* Didn't find a matching cpu */ rtas_st(rets, 0, -3); } static void rtas_start_cpu(sPAPREnvironment *spapr, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { target_ulong id, start, r3; CPUState *env; if (nargs != 3 || nret != 1) { rtas_st(rets, 0, -3); return; } id = rtas_ld(args, 0); start = rtas_ld(args, 1); r3 = rtas_ld(args, 2); for (env = first_cpu; env; env = env->next_cpu) { if (env->cpu_index != id) { continue; } if (!env->halted) { rtas_st(rets, 0, -1); return; } env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME); env->nip = start; env->gpr[3] = r3; env->halted = 0; qemu_cpu_kick(env); rtas_st(rets, 0, 0); return; } /* Didn't find a matching cpu */ rtas_st(rets, 0, -3); } static struct rtas_call { const char *name; spapr_rtas_fn fn; } rtas_table[TOKEN_MAX]; struct rtas_call *rtas_next = rtas_table; target_ulong spapr_rtas_call(sPAPREnvironment *spapr, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { if ((token >= TOKEN_BASE) && ((token - TOKEN_BASE) < TOKEN_MAX)) { struct rtas_call *call = rtas_table + (token - TOKEN_BASE); if (call->fn) { call->fn(spapr, token, nargs, args, nret, rets); return H_SUCCESS; } } /* HACK: Some Linux early debug code uses RTAS display-character, * but assumes the token value is 0xa (which it is on some real * machines) without looking it up in the device tree. This * special case makes this work */ if (token == 0xa) { rtas_display_character(spapr, 0xa, nargs, args, nret, rets); return H_SUCCESS; } hcall_dprintf("Unknown RTAS token 0x%x\n", token); rtas_st(rets, 0, -3); return H_PARAMETER; } void spapr_rtas_register(const char *name, spapr_rtas_fn fn) { assert(rtas_next < (rtas_table + TOKEN_MAX)); rtas_next->name = name; rtas_next->fn = fn; rtas_next++; } int spapr_rtas_device_tree_setup(void *fdt, target_phys_addr_t rtas_addr, target_phys_addr_t rtas_size) { int ret; int i; ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size); if (ret < 0) { fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n", fdt_strerror(ret)); return ret; } ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base", rtas_addr); if (ret < 0) { fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n", fdt_strerror(ret)); return ret; } ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry", rtas_addr); if (ret < 0) { fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n", fdt_strerror(ret)); return ret; } ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size", rtas_size); if (ret < 0) { fprintf(stderr, "Couldn't add rtas-size property: %s\n", fdt_strerror(ret)); return ret; } for (i = 0; i < TOKEN_MAX; i++) { struct rtas_call *call = &rtas_table[i]; if (!call->fn) { continue; } ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name, i + TOKEN_BASE); if (ret < 0) { fprintf(stderr, "Couldn't add rtas token for %s: %s\n", call->name, fdt_strerror(ret)); return ret; } } return 0; } static void register_core_rtas(void) { spapr_rtas_register("display-character", rtas_display_character); spapr_rtas_register("get-time-of-day", rtas_get_time_of_day); spapr_rtas_register("power-off", rtas_power_off); spapr_rtas_register("query-cpu-stopped-state", rtas_query_cpu_stopped_state); spapr_rtas_register("start-cpu", rtas_start_cpu); } device_init(register_core_rtas);