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/* $OpenBSD: psci.c,v 1.9 2021/10/10 16:20:37 kettenis Exp $ */
/*
* Copyright (c) 2016 Jonathan Gray <jsg@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
#include <dev/fdt/pscivar.h>
extern void (*cpuresetfn)(void);
extern void (*powerdownfn)(void);
#define SMCCC_VERSION 0x80000000
#define SMCCC_ARCH_FEATURES 0x80000001
#define SMCCC_ARCH_WORKAROUND_1 0x80008000
#define PSCI_VERSION 0x84000000
#ifdef __LP64__
#define CPU_ON 0xc4000003
#else
#define CPU_ON 0x84000003
#endif
#define SYSTEM_OFF 0x84000008
#define SYSTEM_RESET 0x84000009
#define PSCI_FEATURES 0x8400000a
struct psci_softc {
struct device sc_dev;
register_t (*sc_callfn)(register_t, register_t, register_t,
register_t);
uint32_t sc_psci_version;
uint32_t sc_system_off;
uint32_t sc_system_reset;
uint32_t sc_cpu_on;
uint32_t sc_smccc_version;
};
struct psci_softc *psci_sc;
int psci_match(struct device *, void *, void *);
void psci_attach(struct device *, struct device *, void *);
void psci_reset(void);
void psci_powerdown(void);
extern register_t hvc_call(register_t, register_t, register_t, register_t);
extern register_t smc_call(register_t, register_t, register_t, register_t);
int32_t smccc_version(void);
int32_t smccc_arch_features(uint32_t);
uint32_t psci_version(void);
int32_t psci_features(uint32_t);
struct cfattach psci_ca = {
sizeof(struct psci_softc), psci_match, psci_attach
};
struct cfdriver psci_cd = {
NULL, "psci", DV_DULL
};
int
psci_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "arm,psci") ||
OF_is_compatible(faa->fa_node, "arm,psci-0.2") ||
OF_is_compatible(faa->fa_node, "arm,psci-1.0");
}
void
psci_attach(struct device *parent, struct device *self, void *aux)
{
struct psci_softc *sc = (struct psci_softc *)self;
struct fdt_attach_args *faa = aux;
char method[128];
uint32_t version;
if (OF_getprop(faa->fa_node, "method", method, sizeof(method))) {
if (strcmp(method, "hvc") == 0)
sc->sc_callfn = hvc_call;
else if (strcmp(method, "smc") == 0)
sc->sc_callfn = smc_call;
}
/*
* The function IDs are only to be parsed for the old specification
* (as in version 0.1). All newer implementations are supposed to
* use the specified values.
*/
if (OF_is_compatible(faa->fa_node, "arm,psci-0.2") ||
OF_is_compatible(faa->fa_node, "arm,psci-1.0")) {
sc->sc_psci_version = PSCI_VERSION;
sc->sc_system_off = SYSTEM_OFF;
sc->sc_system_reset = SYSTEM_RESET;
sc->sc_cpu_on = CPU_ON;
} else if (OF_is_compatible(faa->fa_node, "arm,psci")) {
sc->sc_system_off = OF_getpropint(faa->fa_node,
"system_off", 0);
sc->sc_system_reset = OF_getpropint(faa->fa_node,
"system_reset", 0);
sc->sc_cpu_on = OF_getpropint(faa->fa_node, "cpu_on", 0);
}
psci_sc = sc;
version = psci_version();
printf(": PSCI %d.%d", version >> 16, version & 0xffff);
if (version >= 0x10000) {
if (psci_features(SMCCC_VERSION) == PSCI_SUCCESS) {
sc->sc_smccc_version = smccc_version();
printf(", SMCCC %d.%d", sc->sc_smccc_version >> 16,
sc->sc_smccc_version & 0xffff);
}
}
printf("\n");
if (sc->sc_system_off != 0)
powerdownfn = psci_powerdown;
if (sc->sc_system_reset != 0)
cpuresetfn = psci_reset;
}
void
psci_reset(void)
{
struct psci_softc *sc = psci_sc;
if (sc->sc_callfn)
(*sc->sc_callfn)(sc->sc_system_reset, 0, 0, 0);
}
void
psci_powerdown(void)
{
struct psci_softc *sc = psci_sc;
if (sc->sc_callfn)
(*sc->sc_callfn)(sc->sc_system_off, 0, 0, 0);
}
/*
* Firmware-based workaround for CVE-2017-5715. We determine whether
* the workaround is actually implemented and needed the first time we
* are invoked such that we only make the firmware call when appropriate.
*/
void
psci_flush_bp_none(void)
{
}
void
psci_flush_bp_smccc_arch_workaround_1(void)
{
struct psci_softc *sc = psci_sc;
(*sc->sc_callfn)(SMCCC_ARCH_WORKAROUND_1, 0, 0, 0);
}
void
psci_flush_bp(void)
{
struct psci_softc *sc = psci_sc;
struct cpu_info *ci = curcpu();
/*
* SMCCC 1.1 allows us to detect if the workaround is
* implemented and needed.
*/
if (sc && sc->sc_smccc_version >= 0x10001 &&
smccc_arch_features(SMCCC_ARCH_WORKAROUND_1) == 0) {
/* Workaround implemented and needed. */
ci->ci_flush_bp = psci_flush_bp_smccc_arch_workaround_1;
ci->ci_flush_bp();
} else {
/* Workaround isn't implemented or isn't needed. */
ci->ci_flush_bp = psci_flush_bp_none;
}
}
int32_t
smccc_version(void)
{
struct psci_softc *sc = psci_sc;
int32_t version;
KASSERT(sc && sc->sc_callfn);
version = (*sc->sc_callfn)(SMCCC_VERSION, 0, 0, 0);
if (version != PSCI_NOT_SUPPORTED)
return version;
/* Treat NOT_SUPPORTED as 1.0 */
return 0x10000;
}
int32_t
smccc_arch_features(uint32_t arch_func_id)
{
struct psci_softc *sc = psci_sc;
KASSERT(sc && sc->sc_callfn);
return (*sc->sc_callfn)(SMCCC_ARCH_FEATURES, arch_func_id, 0, 0);
}
uint32_t
psci_version(void)
{
struct psci_softc *sc = psci_sc;
if (sc && sc->sc_callfn && sc->sc_psci_version != 0)
return (*sc->sc_callfn)(sc->sc_psci_version, 0, 0, 0);
/* No version support; return 0.0. */
return 0;
}
int32_t
psci_cpu_on(register_t target_cpu, register_t entry_point_address,
register_t context_id)
{
struct psci_softc *sc = psci_sc;
if (sc && sc->sc_callfn && sc->sc_cpu_on != 0)
return (*sc->sc_callfn)(sc->sc_cpu_on, target_cpu,
entry_point_address, context_id);
return PSCI_NOT_SUPPORTED;
}
int32_t
psci_features(uint32_t psci_func_id)
{
struct psci_softc *sc = psci_sc;
if (sc && sc->sc_callfn)
return (*sc->sc_callfn)(PSCI_FEATURES, psci_func_id, 0, 0);
return PSCI_NOT_SUPPORTED;
}
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