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target/arm: Support multiple EL change hooks 

Signed-off-by: Aaron Lindsay <alindsay@codeaurora.org>
Message-id: 1523997485-1905-7-git-send-email-alindsay@codeaurora.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Aaron Lindsay 2018-04-26 11:04:39 +01:00 committed by Peter Maydell
parent d5a5e4c93d
commit 08267487c9
3 changed files with 30 additions and 18 deletions
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21
target/arm/cpu.c
View File

@ -55,13 +55,15 @@ static bool arm_cpu_has_work(CPUState *cs)
| CPU_INTERRUPT_EXITTB);
}
void arm_register_el_change_hook(ARMCPU *cpu, ARMELChangeHook *hook,
void arm_register_el_change_hook(ARMCPU *cpu, ARMELChangeHookFn *hook,
void *opaque)
{
/* We currently only support registering a single hook function */
assert(!cpu->el_change_hook);
cpu->el_change_hook = hook;
cpu->el_change_hook_opaque = opaque;
ARMELChangeHook *entry = g_new0(ARMELChangeHook, 1);
entry->hook = hook;
entry->opaque = opaque;
QLIST_INSERT_HEAD(&cpu->el_change_hooks, entry, node);
}
static void cp_reg_reset(gpointer key, gpointer value, gpointer opaque)
@ -552,6 +554,8 @@ static void arm_cpu_initfn(Object *obj)
cpu->cp_regs = g_hash_table_new_full(g_int_hash, g_int_equal,
g_free, g_free);
QLIST_INIT(&cpu->el_change_hooks);
#ifndef CONFIG_USER_ONLY
/* Our inbound IRQ and FIQ lines */
if (kvm_enabled()) {
@ -713,7 +717,14 @@ static void arm_cpu_post_init(Object *obj)
static void arm_cpu_finalizefn(Object *obj)
{
ARMCPU *cpu = ARM_CPU(obj);
ARMELChangeHook *hook, *next;
g_hash_table_destroy(cpu->cp_regs);
QLIST_FOREACH_SAFE(hook, &cpu->el_change_hooks, node, next) {
QLIST_REMOVE(hook, node);
g_free(hook);
}
}
static void arm_cpu_realizefn(DeviceState *dev, Error **errp)

20
target/arm/cpu.h
View File

@ -632,12 +632,17 @@ typedef struct CPUARMState {
} CPUARMState;
/**
* ARMELChangeHook:
* ARMELChangeHookFn:
* type of a function which can be registered via arm_register_el_change_hook()
* to get callbacks when the CPU changes its exception level or mode.
*/
typedef void ARMELChangeHook(ARMCPU *cpu, void *opaque);
typedef void ARMELChangeHookFn(ARMCPU *cpu, void *opaque);
typedef struct ARMELChangeHook ARMELChangeHook;
struct ARMELChangeHook {
ARMELChangeHookFn *hook;
void *opaque;
QLIST_ENTRY(ARMELChangeHook) node;
};
/* These values map onto the return values for
* QEMU_PSCI_0_2_FN_AFFINITY_INFO */
@ -826,8 +831,7 @@ struct ARMCPU {
*/
bool cfgend;
ARMELChangeHook *el_change_hook;
void *el_change_hook_opaque;
QLIST_HEAD(, ARMELChangeHook) el_change_hooks;
int32_t node_id; /* NUMA node this CPU belongs to */
@ -2894,12 +2898,8 @@ static inline AddressSpace *arm_addressspace(CPUState *cs, MemTxAttrs attrs)
* CPU changes exception level or mode. The hook function will be
* passed a pointer to the ARMCPU and the opaque data pointer passed
* to this function when the hook was registered.
*
* Note that we currently only support registering a single hook function,
* and will assert if this function is called twice.
* This facility is intended for the use of the GICv3 emulation.
*/
void arm_register_el_change_hook(ARMCPU *cpu, ARMELChangeHook *hook,
void arm_register_el_change_hook(ARMCPU *cpu, ARMELChangeHookFn *hook,
void *opaque);
/**

7
target/arm/internals.h
View File

@ -727,11 +727,12 @@ void arm_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
int mmu_idx, MemTxAttrs attrs,
MemTxResult response, uintptr_t retaddr);
/* Call the EL change hook if one has been registered */
/* Call any registered EL change hooks */
static inline void arm_call_el_change_hook(ARMCPU *cpu)
{
if (cpu->el_change_hook) {
cpu->el_change_hook(cpu, cpu->el_change_hook_opaque);
ARMELChangeHook *hook, *next;
QLIST_FOREACH_SAFE(hook, &cpu->el_change_hooks, node, next) {
hook->hook(cpu, hook->opaque);
}
}