/* * SPAPR base RTAS calls * * Borrowed heavily from QEMU's spapr_rtas.c * Copyright (c) 2010-2011 David Gibson, IBM Corporation. * * Modifications copyright 2011 Matt Evans , IBM Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. */ #include "kvm/kvm.h" #include "kvm/kvm-cpu.h" #include "kvm/util.h" #include "kvm/term.h" #include "spapr.h" #include #include #include #define TOKEN_BASE 0x2000 #define TOKEN_MAX 0x100 #define RTAS_CONSOLE static struct rtas_call { const char *name; spapr_rtas_fn fn; } rtas_table[TOKEN_MAX]; struct rtas_call *rtas_next = rtas_table; static void rtas_display_character(struct kvm_cpu *vcpu, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { char c = rtas_ld(vcpu->kvm, args, 0); term_putc(&c, 1, 0); rtas_st(vcpu->kvm, rets, 0, 0); } #ifdef RTAS_CONSOLE static void rtas_put_term_char(struct kvm_cpu *vcpu, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { char c = rtas_ld(vcpu->kvm, args, 0); term_putc(&c, 1, 0); rtas_st(vcpu->kvm, rets, 0, 0); } static void rtas_get_term_char(struct kvm_cpu *vcpu, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { int c; if (vcpu->kvm->cfg.active_console == CONSOLE_HV && term_readable(0) && (c = term_getc(vcpu->kvm, 0)) >= 0) { rtas_st(vcpu->kvm, rets, 0, 0); rtas_st(vcpu->kvm, rets, 1, c); } else { rtas_st(vcpu->kvm, rets, 0, -2); } } #endif static void rtas_get_time_of_day(struct kvm_cpu *vcpu, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { struct tm tm; time_t tnow; if (nret != 8) { rtas_st(vcpu->kvm, rets, 0, -3); return; } tnow = time(NULL); /* Guest time is currently not offset in any way. */ gmtime_r(&tnow, &tm); rtas_st(vcpu->kvm, rets, 0, 0); /* Success */ rtas_st(vcpu->kvm, rets, 1, tm.tm_year + 1900); rtas_st(vcpu->kvm, rets, 2, tm.tm_mon + 1); rtas_st(vcpu->kvm, rets, 3, tm.tm_mday); rtas_st(vcpu->kvm, rets, 4, tm.tm_hour); rtas_st(vcpu->kvm, rets, 5, tm.tm_min); rtas_st(vcpu->kvm, rets, 6, tm.tm_sec); rtas_st(vcpu->kvm, rets, 7, 0); } static void rtas_set_time_of_day(struct kvm_cpu *vcpu, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { pr_warning("%s called; TOD set ignored.\n", __FUNCTION__); } static void rtas_power_off(struct kvm_cpu *vcpu, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { if (nargs != 2 || nret != 1) { rtas_st(vcpu->kvm, rets, 0, -3); return; } kvm__reboot(vcpu->kvm); } static void rtas_system_reboot(struct kvm_cpu *vcpu, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { if (nargs != 0 || nret != 1) { rtas_st(vcpu->kvm, rets, 0, -3); return; } /* NB this actually halts the VM */ kvm__reboot(vcpu->kvm); } static void rtas_query_cpu_stopped_state(struct kvm_cpu *vcpu, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { if (nargs != 1 || nret != 2) { rtas_st(vcpu->kvm, rets, 0, -3); return; } /* * Can read id = rtas_ld(vcpu->kvm, args, 0), but * we currently start all CPUs. So just return true. */ rtas_st(vcpu->kvm, rets, 0, 0); rtas_st(vcpu->kvm, rets, 1, 2); } static void rtas_start_cpu(struct kvm_cpu *vcpu, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { die(__FUNCTION__); } target_ulong spapr_rtas_call(struct kvm_cpu *vcpu, 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(vcpu, 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(vcpu, 0xa, nargs, args, nret, rets); return H_SUCCESS; } hcall_dprintf("Unknown RTAS token 0x%x\n", token); rtas_st(vcpu->kvm, 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++; } /* * This is called from the context of an open /rtas node, in order to add * properties for the rtas call tokens. */ int spapr_rtas_fdt_setup(struct kvm *kvm, void *fdt) { int ret; int i; for (i = 0; i < TOKEN_MAX; i++) { struct rtas_call *call = &rtas_table[i]; if (!call->fn) { continue; } ret = fdt_property_cell(fdt, call->name, i + TOKEN_BASE); if (ret < 0) { pr_warning("Couldn't add rtas token for %s: %s\n", call->name, fdt_strerror(ret)); return ret; } } return 0; } 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("set-time-of-day", rtas_set_time_of_day); spapr_rtas_register("power-off", rtas_power_off); spapr_rtas_register("system-reboot", rtas_system_reboot); spapr_rtas_register("query-cpu-stopped-state", rtas_query_cpu_stopped_state); spapr_rtas_register("start-cpu", rtas_start_cpu); #ifdef RTAS_CONSOLE /* These are unused: We do console I/O via hcalls, not rtas. */ spapr_rtas_register("put-term-char", rtas_put_term_char); spapr_rtas_register("get-term-char", rtas_get_term_char); #endif }