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ppc: allow the hdecr timer to be created/destroyed

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Machines which don't emulate the HDEC facility are able to use the
timer for something else. Provide functions to start and stop the
hdecr timer.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[ clg: checkpatch fixes ]
Message-Id: <20220216102545.1808018-4-npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Nicholas Piggin 2022-02-18 08:34:14 +01:00 committed by Cédric Le Goater
parent 5ff40b0124
commit 93aeb70210
2 changed files with 24 additions and 0 deletions
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21
hw/ppc/ppc.c
View File

@ -1083,6 +1083,27 @@ clk_setup_cb cpu_ppc_tb_init (CPUPPCState *env, uint32_t freq)
return &cpu_ppc_set_tb_clk;
}
/* cpu_ppc_hdecr_init may be used if the timer is not used by HDEC emulation */
void cpu_ppc_hdecr_init(CPUPPCState *env)
{
PowerPCCPU *cpu = env_archcpu(env);
assert(env->tb_env->hdecr_timer == NULL);
env->tb_env->hdecr_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
&cpu_ppc_hdecr_cb, cpu);
}
void cpu_ppc_hdecr_exit(CPUPPCState *env)
{
PowerPCCPU *cpu = env_archcpu(env);
timer_free(env->tb_env->hdecr_timer);
env->tb_env->hdecr_timer = NULL;
cpu_ppc_hdecr_lower(cpu);
}
/*****************************************************************************/
/* PowerPC 40x timers */

3
include/hw/ppc/ppc.h
View File

@ -54,6 +54,9 @@ struct ppc_tb_t {
uint64_t cpu_ppc_get_tb(ppc_tb_t *tb_env, uint64_t vmclk, int64_t tb_offset);
clk_setup_cb cpu_ppc_tb_init (CPUPPCState *env, uint32_t freq);
void cpu_ppc_hdecr_init(CPUPPCState *env);
void cpu_ppc_hdecr_exit(CPUPPCState *env);
/* Embedded PowerPC DCR management */
typedef uint32_t (*dcr_read_cb)(void *opaque, int dcrn);
typedef void (*dcr_write_cb)(void *opaque, int dcrn, uint32_t val);