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i386/fw_cfg: move hpet_cfg definition to hpet.c

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HPET device needs to access and update hpet_cfg variable, but now it is
defined in hw/i386/fw_cfg.c and Rust code can't access it.

Move hpet_cfg definition to hpet.c (and rename it to hpet_fw_cfg). This
allows Rust HPET device implements its own global hpet_fw_cfg variable,
and will further reduce the use of unsafe C code access and calls in the
Rust HPET implementation.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250210030051.2562726-2-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Zhao Liu 2025-02-10 11:00:42 +08:00 • committed by Paolo Bonzini
parent 7630ca2a70
commit f32352ff9e
3 changed files with 14 additions and 10 deletions
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16
hw/timer/hpet.c
View file

@ -40,6 +40,8 @@
#include "qom/object.h"
#include "trace.h"
struct hpet_fw_config hpet_fw_cfg = {.count = UINT8_MAX};
#define HPET_MSI_SUPPORT 0
OBJECT_DECLARE_SIMPLE_TYPE(HPETState, HPET)
@ -278,7 +280,7 @@ static int hpet_post_load(void *opaque, int version_id)
/* Push number of timers into capability returned via HPET_ID */
s->capability &= ~HPET_ID_NUM_TIM_MASK;
s->capability |= (s->num_timers - 1) << HPET_ID_NUM_TIM_SHIFT;
hpet_cfg.hpet[s->hpet_id].event_timer_block_id = (uint32_t)s->capability;
hpet_fw_cfg.hpet[s->hpet_id].event_timer_block_id = (uint32_t)s->capability;
/* Derive HPET_MSI_SUPPORT from the capability of the first timer. */
s->flags &= ~(1 << HPET_MSI_SUPPORT);
@ -665,8 +667,8 @@ static void hpet_reset(DeviceState *d)
s->hpet_counter = 0ULL;
s->hpet_offset = 0ULL;
s->config = 0ULL;
hpet_cfg.hpet[s->hpet_id].event_timer_block_id = (uint32_t)s->capability;
hpet_cfg.hpet[s->hpet_id].address = sbd->mmio[0].addr;
hpet_fw_cfg.hpet[s->hpet_id].event_timer_block_id = (uint32_t)s->capability;
hpet_fw_cfg.hpet[s->hpet_id].address = sbd->mmio[0].addr;
/* to document that the RTC lowers its output on reset as well */
s->rtc_irq_level = 0;
@ -708,17 +710,17 @@ static void hpet_realize(DeviceState *dev, Error **errp)
if (!s->intcap) {
warn_report("Hpet's intcap not initialized");
}
if (hpet_cfg.count == UINT8_MAX) {
if (hpet_fw_cfg.count == UINT8_MAX) {
/* first instance */
hpet_cfg.count = 0;
hpet_fw_cfg.count = 0;
}
if (hpet_cfg.count == 8) {
if (hpet_fw_cfg.count == 8) {
error_setg(errp, "Only 8 instances of HPET is allowed");
return;
}
s->hpet_id = hpet_cfg.count++;
s->hpet_id = hpet_fw_cfg.count++;
for (i = 0; i < HPET_NUM_IRQ_ROUTES; i++) {
sysbus_init_irq(sbd, &s->irqs[i]);