root / hw / spapr_rtas.c @ ba7cb5a8
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/*
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* QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
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*
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* Hypercall based emulated RTAS
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*
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* Copyright (c) 2010-2011 David Gibson, IBM Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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*/
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#include "cpu.h" |
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#include "sysemu.h" |
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#include "qemu-char.h" |
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#include "hw/qdev.h" |
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#include "device_tree.h" |
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#include "hw/spapr.h" |
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#include "hw/spapr_vio.h" |
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#include <libfdt.h> |
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#define TOKEN_BASE 0x2000 |
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#define TOKEN_MAX 0x100 |
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static void rtas_display_character(sPAPREnvironment *spapr, |
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uint32_t token, uint32_t nargs, |
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target_ulong args, |
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uint32_t nret, target_ulong rets) |
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{ |
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uint8_t c = rtas_ld(args, 0);
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VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, |
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SPAPR_VTY_BASE_ADDRESS); |
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if (!sdev) {
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rtas_st(rets, 0, -1); |
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} else {
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vty_putchars(sdev, &c, sizeof(c));
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rtas_st(rets, 0, 0); |
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} |
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} |
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static void rtas_get_time_of_day(sPAPREnvironment *spapr, |
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uint32_t token, uint32_t nargs, |
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target_ulong args, |
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uint32_t nret, target_ulong rets) |
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{ |
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struct tm tm;
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if (nret != 8) { |
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rtas_st(rets, 0, -3); |
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return;
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} |
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qemu_get_timedate(&tm, 0);
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rtas_st(rets, 0, 0); /* Success */ |
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rtas_st(rets, 1, tm.tm_year + 1900); |
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rtas_st(rets, 2, tm.tm_mon + 1); |
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rtas_st(rets, 3, tm.tm_mday);
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rtas_st(rets, 4, tm.tm_hour);
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rtas_st(rets, 5, tm.tm_min);
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rtas_st(rets, 6, tm.tm_sec);
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rtas_st(rets, 7, 0); /* we don't do nanoseconds */ |
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} |
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static void rtas_power_off(sPAPREnvironment *spapr, |
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uint32_t token, uint32_t nargs, target_ulong args, |
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uint32_t nret, target_ulong rets) |
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{ |
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if (nargs != 2 || nret != 1) { |
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rtas_st(rets, 0, -3); |
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return;
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} |
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qemu_system_shutdown_request(); |
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rtas_st(rets, 0, 0); |
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} |
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static void rtas_query_cpu_stopped_state(sPAPREnvironment *spapr, |
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uint32_t token, uint32_t nargs, |
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target_ulong args, |
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uint32_t nret, target_ulong rets) |
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{ |
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target_ulong id; |
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CPUState *env; |
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if (nargs != 1 || nret != 2) { |
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rtas_st(rets, 0, -3); |
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return;
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} |
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id = rtas_ld(args, 0);
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for (env = first_cpu; env; env = env->next_cpu) {
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if (env->cpu_index != id) {
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continue;
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} |
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if (env->halted) {
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rtas_st(rets, 1, 0); |
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} else {
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rtas_st(rets, 1, 2); |
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} |
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rtas_st(rets, 0, 0); |
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return;
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} |
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/* Didn't find a matching cpu */
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rtas_st(rets, 0, -3); |
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} |
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static void rtas_start_cpu(sPAPREnvironment *spapr, |
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uint32_t token, uint32_t nargs, |
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target_ulong args, |
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uint32_t nret, target_ulong rets) |
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{ |
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target_ulong id, start, r3; |
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CPUState *env; |
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if (nargs != 3 || nret != 1) { |
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rtas_st(rets, 0, -3); |
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return;
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} |
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id = rtas_ld(args, 0);
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start = rtas_ld(args, 1);
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r3 = rtas_ld(args, 2);
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for (env = first_cpu; env; env = env->next_cpu) {
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if (env->cpu_index != id) {
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continue;
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} |
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if (!env->halted) {
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rtas_st(rets, 0, -1); |
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return;
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} |
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env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME); |
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env->nip = start; |
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env->gpr[3] = r3;
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env->halted = 0;
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qemu_cpu_kick(env); |
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rtas_st(rets, 0, 0); |
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return;
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} |
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/* Didn't find a matching cpu */
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rtas_st(rets, 0, -3); |
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} |
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static struct rtas_call { |
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const char *name; |
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spapr_rtas_fn fn; |
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} rtas_table[TOKEN_MAX]; |
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struct rtas_call *rtas_next = rtas_table;
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target_ulong spapr_rtas_call(sPAPREnvironment *spapr, |
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uint32_t token, uint32_t nargs, target_ulong args, |
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uint32_t nret, target_ulong rets) |
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{ |
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if ((token >= TOKEN_BASE)
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&& ((token - TOKEN_BASE) < TOKEN_MAX)) { |
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struct rtas_call *call = rtas_table + (token - TOKEN_BASE);
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if (call->fn) {
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call->fn(spapr, token, nargs, args, nret, rets); |
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return H_SUCCESS;
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} |
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} |
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/* HACK: Some Linux early debug code uses RTAS display-character,
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* but assumes the token value is 0xa (which it is on some real
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* machines) without looking it up in the device tree. This
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* special case makes this work */
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if (token == 0xa) { |
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rtas_display_character(spapr, 0xa, nargs, args, nret, rets);
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return H_SUCCESS;
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} |
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hcall_dprintf("Unknown RTAS token 0x%x\n", token);
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rtas_st(rets, 0, -3); |
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return H_PARAMETER;
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} |
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void spapr_rtas_register(const char *name, spapr_rtas_fn fn) |
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{ |
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assert(rtas_next < (rtas_table + TOKEN_MAX)); |
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rtas_next->name = name; |
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rtas_next->fn = fn; |
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rtas_next++; |
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} |
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int spapr_rtas_device_tree_setup(void *fdt, target_phys_addr_t rtas_addr, |
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target_phys_addr_t rtas_size) |
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{ |
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int ret;
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int i;
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ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size); |
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if (ret < 0) { |
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fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
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fdt_strerror(ret)); |
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return ret;
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} |
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ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base", |
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rtas_addr); |
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if (ret < 0) { |
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fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
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fdt_strerror(ret)); |
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return ret;
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} |
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ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry", |
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rtas_addr); |
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if (ret < 0) { |
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fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
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fdt_strerror(ret)); |
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return ret;
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} |
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ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size", |
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rtas_size); |
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if (ret < 0) { |
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fprintf(stderr, "Couldn't add rtas-size property: %s\n",
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fdt_strerror(ret)); |
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return ret;
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} |
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for (i = 0; i < TOKEN_MAX; i++) { |
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struct rtas_call *call = &rtas_table[i];
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if (!call->fn) {
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continue;
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} |
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ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name,
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i + TOKEN_BASE); |
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if (ret < 0) { |
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fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
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call->name, fdt_strerror(ret)); |
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return ret;
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} |
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} |
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return 0; |
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} |
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static void register_core_rtas(void) |
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{ |
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spapr_rtas_register("display-character", rtas_display_character);
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spapr_rtas_register("get-time-of-day", rtas_get_time_of_day);
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spapr_rtas_register("power-off", rtas_power_off);
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spapr_rtas_register("query-cpu-stopped-state",
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rtas_query_cpu_stopped_state); |
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spapr_rtas_register("start-cpu", rtas_start_cpu);
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} |
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device_init(register_core_rtas); |