diff options
Diffstat (limited to 'hw/openrisc/cputimer.c')
| -rw-r--r-- | hw/openrisc/cputimer.c | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/hw/openrisc/cputimer.c b/hw/openrisc/cputimer.c index 835986c..6331997 100644 --- a/hw/openrisc/cputimer.c +++ b/hw/openrisc/cputimer.c @@ -22,14 +22,15 @@ #include "cpu.h" #include "migration/vmstate.h" #include "qemu/timer.h" -#include "sysemu/reset.h" +#include "system/reset.h" #define TIMER_PERIOD 50 /* 50 ns period for 20 MHz timer */ /* Tick Timer global state to allow all cores to be in sync */ typedef struct OR1KTimerState { uint32_t ttcr; - uint64_t last_clk; + uint32_t ttcr_offset; + uint64_t clk_offset; } OR1KTimerState; static OR1KTimerState *or1k_timer; @@ -37,6 +38,8 @@ static OR1KTimerState *or1k_timer; void cpu_openrisc_count_set(OpenRISCCPU *cpu, uint32_t val) { or1k_timer->ttcr = val; + or1k_timer->ttcr_offset = val; + or1k_timer->clk_offset = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); } uint32_t cpu_openrisc_count_get(OpenRISCCPU *cpu) @@ -53,9 +56,8 @@ void cpu_openrisc_count_update(OpenRISCCPU *cpu) return; } now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); - or1k_timer->ttcr += (uint32_t)((now - or1k_timer->last_clk) - / TIMER_PERIOD); - or1k_timer->last_clk = now; + or1k_timer->ttcr = or1k_timer->ttcr_offset + + DIV_ROUND_UP(now - or1k_timer->clk_offset, TIMER_PERIOD); } /* Update the next timeout time as difference between ttmr and ttcr */ @@ -69,7 +71,7 @@ void cpu_openrisc_timer_update(OpenRISCCPU *cpu) } cpu_openrisc_count_update(cpu); - now = or1k_timer->last_clk; + now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); if ((cpu->env.ttmr & TTMR_TP) <= (or1k_timer->ttcr & TTMR_TP)) { wait = TTMR_TP - (or1k_timer->ttcr & TTMR_TP) + 1; @@ -110,7 +112,8 @@ static void openrisc_timer_cb(void *opaque) case TIMER_NONE: break; case TIMER_INTR: - or1k_timer->ttcr = 0; + /* Zero the count by applying a negative offset to the counter */ + or1k_timer->ttcr_offset -= (cpu->env.ttmr & TTMR_TP); break; case TIMER_SHOT: cpu_openrisc_count_stop(cpu); @@ -137,17 +140,18 @@ static void openrisc_count_reset(void *opaque) /* Reset the global timer state. */ static void openrisc_timer_reset(void *opaque) { - or1k_timer->ttcr = 0x00000000; - or1k_timer->last_clk = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + OpenRISCCPU *cpu = opaque; + cpu_openrisc_count_set(cpu, 0); } static const VMStateDescription vmstate_or1k_timer = { .name = "or1k_timer", - .version_id = 1, - .minimum_version_id = 1, + .version_id = 2, + .minimum_version_id = 2, .fields = (const VMStateField[]) { VMSTATE_UINT32(ttcr, OR1KTimerState), - VMSTATE_UINT64(last_clk, OR1KTimerState), + VMSTATE_UINT32(ttcr_offset, OR1KTimerState), + VMSTATE_UINT64(clk_offset, OR1KTimerState), VMSTATE_END_OF_LIST() } }; |