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-rw-r--r--hw/ppc.c121
1 files changed, 92 insertions, 29 deletions
diff --git a/hw/ppc.c b/hw/ppc.c
index 2fd3a4e57f..742d3de591 100644
--- a/hw/ppc.c
+++ b/hw/ppc.c
@@ -30,6 +30,9 @@
extern FILE *logfile;
extern int loglevel;
+static void cpu_ppc_tb_stop (CPUState *env);
+static void cpu_ppc_tb_start (CPUState *env);
+
static void ppc_set_irq (CPUState *env, int n_IRQ, int level)
{
if (level) {
@@ -65,6 +68,19 @@ static void ppc6xx_set_irq (void *opaque, int pin, int level)
/* Don't generate spurious events */
if ((cur_level == 1 && level == 0) || (cur_level == 0 && level != 0)) {
switch (pin) {
+ case PPC6xx_INPUT_TBEN:
+ /* Level sensitive - active high */
+#if defined(PPC_DEBUG_IRQ)
+ if (loglevel & CPU_LOG_INT) {
+ fprintf(logfile, "%s: %s the time base\n",
+ __func__, level ? "start" : "stop");
+ }
+#endif
+ if (level) {
+ cpu_ppc_tb_start(env);
+ } else {
+ cpu_ppc_tb_stop(env);
+ }
case PPC6xx_INPUT_INT:
/* Level sensitive - active high */
#if defined(PPC_DEBUG_IRQ)
@@ -402,11 +418,12 @@ void ppc40x_irq_init (CPUState *env)
/* PowerPC time base and decrementer emulation */
struct ppc_tb_t {
/* Time base management */
- int64_t tb_offset; /* Compensation */
- int64_t atb_offset; /* Compensation */
- uint32_t tb_freq; /* TB frequency */
+ int64_t tb_offset; /* Compensation */
+ int64_t atb_offset; /* Compensation */
+ uint32_t tb_freq; /* TB frequency */
/* Decrementer management */
- uint64_t decr_next; /* Tick for next decr interrupt */
+ uint64_t decr_next; /* Tick for next decr interrupt */
+ uint32_t decr_freq; /* decrementer frequency */
struct QEMUTimer *decr_timer;
#if defined(TARGET_PPC64H)
/* Hypervisor decrementer management */
@@ -418,12 +435,11 @@ struct ppc_tb_t {
void *opaque;
};
-static always_inline uint64_t cpu_ppc_get_tb (ppc_tb_t *tb_env,
+static always_inline uint64_t cpu_ppc_get_tb (ppc_tb_t *tb_env, uint64_t vmclk,
int64_t tb_offset)
{
/* TB time in tb periods */
- return muldiv64(qemu_get_clock(vm_clock) + tb_env->tb_offset,
- tb_env->tb_freq, ticks_per_sec);
+ return muldiv64(vmclk, tb_env->tb_freq, ticks_per_sec) + tb_offset;
}
uint32_t cpu_ppc_load_tbl (CPUState *env)
@@ -431,7 +447,7 @@ uint32_t cpu_ppc_load_tbl (CPUState *env)
ppc_tb_t *tb_env = env->tb_env;
uint64_t tb;
- tb = cpu_ppc_get_tb(tb_env, tb_env->tb_offset);
+ tb = cpu_ppc_get_tb(tb_env, qemu_get_clock(vm_clock), tb_env->tb_offset);
#if defined(PPC_DEBUG_TB)
if (loglevel != 0) {
fprintf(logfile, "%s: tb=0x%016lx\n", __func__, tb);
@@ -446,7 +462,7 @@ static always_inline uint32_t _cpu_ppc_load_tbu (CPUState *env)
ppc_tb_t *tb_env = env->tb_env;
uint64_t tb;
- tb = cpu_ppc_get_tb(tb_env, tb_env->tb_offset);
+ tb = cpu_ppc_get_tb(tb_env, qemu_get_clock(vm_clock), tb_env->tb_offset);
#if defined(PPC_DEBUG_TB)
if (loglevel != 0) {
fprintf(logfile, "%s: tb=0x%016lx\n", __func__, tb);
@@ -461,12 +477,11 @@ uint32_t cpu_ppc_load_tbu (CPUState *env)
return _cpu_ppc_load_tbu(env);
}
-static always_inline void cpu_ppc_store_tb (ppc_tb_t *tb_env,
+static always_inline void cpu_ppc_store_tb (ppc_tb_t *tb_env, uint64_t vmclk,
int64_t *tb_offsetp,
uint64_t value)
{
- *tb_offsetp = muldiv64(value, ticks_per_sec, tb_env->tb_freq)
- - qemu_get_clock(vm_clock);
+ *tb_offsetp = value - muldiv64(vmclk, tb_env->tb_freq, ticks_per_sec);
#ifdef PPC_DEBUG_TB
if (loglevel != 0) {
fprintf(logfile, "%s: tb=0x%016lx offset=%08lx\n", __func__, value,
@@ -480,9 +495,10 @@ void cpu_ppc_store_tbl (CPUState *env, uint32_t value)
ppc_tb_t *tb_env = env->tb_env;
uint64_t tb;
- tb = cpu_ppc_get_tb(tb_env, tb_env->tb_offset);
+ tb = cpu_ppc_get_tb(tb_env, qemu_get_clock(vm_clock), tb_env->tb_offset);
tb &= 0xFFFFFFFF00000000ULL;
- cpu_ppc_store_tb(tb_env, &tb_env->tb_offset, tb | (uint64_t)value);
+ cpu_ppc_store_tb(tb_env, qemu_get_clock(vm_clock),
+ &tb_env->tb_offset, tb | (uint64_t)value);
}
static always_inline void _cpu_ppc_store_tbu (CPUState *env, uint32_t value)
@@ -490,10 +506,10 @@ static always_inline void _cpu_ppc_store_tbu (CPUState *env, uint32_t value)
ppc_tb_t *tb_env = env->tb_env;
uint64_t tb;
- tb = cpu_ppc_get_tb(tb_env, tb_env->tb_offset);
+ tb = cpu_ppc_get_tb(tb_env, qemu_get_clock(vm_clock), tb_env->tb_offset);
tb &= 0x00000000FFFFFFFFULL;
- cpu_ppc_store_tb(tb_env, &tb_env->tb_offset,
- ((uint64_t)value << 32) | tb);
+ cpu_ppc_store_tb(tb_env, qemu_get_clock(vm_clock),
+ &tb_env->tb_offset, ((uint64_t)value << 32) | tb);
}
void cpu_ppc_store_tbu (CPUState *env, uint32_t value)
@@ -506,7 +522,7 @@ uint32_t cpu_ppc_load_atbl (CPUState *env)
ppc_tb_t *tb_env = env->tb_env;
uint64_t tb;
- tb = cpu_ppc_get_tb(tb_env, tb_env->atb_offset);
+ tb = cpu_ppc_get_tb(tb_env, qemu_get_clock(vm_clock), tb_env->atb_offset);
#if defined(PPC_DEBUG_TB)
if (loglevel != 0) {
fprintf(logfile, "%s: tb=0x%016lx\n", __func__, tb);
@@ -521,7 +537,7 @@ uint32_t cpu_ppc_load_atbu (CPUState *env)
ppc_tb_t *tb_env = env->tb_env;
uint64_t tb;
- tb = cpu_ppc_get_tb(tb_env, tb_env->atb_offset);
+ tb = cpu_ppc_get_tb(tb_env, qemu_get_clock(vm_clock), tb_env->atb_offset);
#if defined(PPC_DEBUG_TB)
if (loglevel != 0) {
fprintf(logfile, "%s: tb=0x%016lx\n", __func__, tb);
@@ -536,9 +552,10 @@ void cpu_ppc_store_atbl (CPUState *env, uint32_t value)
ppc_tb_t *tb_env = env->tb_env;
uint64_t tb;
- tb = cpu_ppc_get_tb(tb_env, tb_env->atb_offset);
+ tb = cpu_ppc_get_tb(tb_env, qemu_get_clock(vm_clock), tb_env->atb_offset);
tb &= 0xFFFFFFFF00000000ULL;
- cpu_ppc_store_tb(tb_env, &tb_env->atb_offset, tb | (uint64_t)value);
+ cpu_ppc_store_tb(tb_env, qemu_get_clock(vm_clock),
+ &tb_env->atb_offset, tb | (uint64_t)value);
}
void cpu_ppc_store_atbu (CPUState *env, uint32_t value)
@@ -546,10 +563,53 @@ void cpu_ppc_store_atbu (CPUState *env, uint32_t value)
ppc_tb_t *tb_env = env->tb_env;
uint64_t tb;
- tb = cpu_ppc_get_tb(tb_env, tb_env->atb_offset);
+ tb = cpu_ppc_get_tb(tb_env, qemu_get_clock(vm_clock), tb_env->atb_offset);
tb &= 0x00000000FFFFFFFFULL;
- cpu_ppc_store_tb(tb_env, &tb_env->atb_offset,
- ((uint64_t)value << 32) | tb);
+ cpu_ppc_store_tb(tb_env, qemu_get_clock(vm_clock),
+ &tb_env->atb_offset, ((uint64_t)value << 32) | tb);
+}
+
+static void cpu_ppc_tb_stop (CPUState *env)
+{
+ ppc_tb_t *tb_env = env->tb_env;
+ uint64_t tb, atb, vmclk;
+
+ /* If the time base is already frozen, do nothing */
+ if (tb_env->tb_freq != 0) {
+ vmclk = qemu_get_clock(vm_clock);
+ /* Get the time base */
+ tb = cpu_ppc_get_tb(tb_env, vmclk, tb_env->tb_offset);
+ /* Get the alternate time base */
+ atb = cpu_ppc_get_tb(tb_env, vmclk, tb_env->atb_offset);
+ /* Store the time base value (ie compute the current offset) */
+ cpu_ppc_store_tb(tb_env, vmclk, &tb_env->tb_offset, tb);
+ /* Store the alternate time base value (compute the current offset) */
+ cpu_ppc_store_tb(tb_env, vmclk, &tb_env->atb_offset, atb);
+ /* Set the time base frequency to zero */
+ tb_env->tb_freq = 0;
+ /* Now, the time bases are frozen to tb_offset / atb_offset value */
+ }
+}
+
+static void cpu_ppc_tb_start (CPUState *env)
+{
+ ppc_tb_t *tb_env = env->tb_env;
+ uint64_t tb, atb, vmclk;
+
+ /* If the time base is not frozen, do nothing */
+ if (tb_env->tb_freq == 0) {
+ vmclk = qemu_get_clock(vm_clock);
+ /* Get the time base from tb_offset */
+ tb = tb_env->tb_offset;
+ /* Get the alternate time base from atb_offset */
+ atb = tb_env->atb_offset;
+ /* Restore the tb frequency from the decrementer frequency */
+ tb_env->tb_freq = tb_env->decr_freq;
+ /* Store the time base value */
+ cpu_ppc_store_tb(tb_env, vmclk, &tb_env->tb_offset, tb);
+ /* Store the alternate time base value */
+ cpu_ppc_store_tb(tb_env, vmclk, &tb_env->atb_offset, atb);
+ }
}
static always_inline uint32_t _cpu_ppc_load_decr (CPUState *env,
@@ -561,9 +621,9 @@ static always_inline uint32_t _cpu_ppc_load_decr (CPUState *env,
diff = tb_env->decr_next - qemu_get_clock(vm_clock);
if (diff >= 0)
- decr = muldiv64(diff, tb_env->tb_freq, ticks_per_sec);
+ decr = muldiv64(diff, tb_env->decr_freq, ticks_per_sec);
else
- decr = -muldiv64(-diff, tb_env->tb_freq, ticks_per_sec);
+ decr = -muldiv64(-diff, tb_env->decr_freq, ticks_per_sec);
#if defined(PPC_DEBUG_TB)
if (loglevel != 0) {
fprintf(logfile, "%s: 0x%08x\n", __func__, decr);
@@ -639,7 +699,7 @@ static void __cpu_ppc_store_decr (CPUState *env, uint64_t *nextp,
}
#endif
now = qemu_get_clock(vm_clock);
- next = now + muldiv64(value, ticks_per_sec, tb_env->tb_freq);
+ next = now + muldiv64(value, ticks_per_sec, tb_env->decr_freq);
if (is_excp)
next += *nextp - now;
if (next == now)
@@ -708,6 +768,7 @@ static void cpu_ppc_set_tb_clk (void *opaque, uint32_t freq)
ppc_tb_t *tb_env = env->tb_env;
tb_env->tb_freq = freq;
+ tb_env->decr_freq = freq;
/* There is a bug in Linux 2.4 kernels:
* if a decrementer exception is pending when it enables msr_ee at startup,
* it's not ready to handle it...
@@ -848,7 +909,7 @@ static void start_stop_pit (CPUState *env, ppc_tb_t *tb_env, int is_excp)
#endif
now = qemu_get_clock(vm_clock);
next = now + muldiv64(ppcemb_timer->pit_reload,
- ticks_per_sec, tb_env->tb_freq);
+ ticks_per_sec, tb_env->decr_freq);
if (is_excp)
next += tb_env->decr_next - now;
if (next == now)
@@ -912,7 +973,7 @@ static void cpu_4xx_wdt_cb (void *opaque)
/* Cannot occur, but makes gcc happy */
return;
}
- next = now + muldiv64(next, ticks_per_sec, tb_env->tb_freq);
+ next = now + muldiv64(next, ticks_per_sec, tb_env->decr_freq);
if (next == now)
next++;
#ifdef PPC_DEBUG_TB
@@ -1014,6 +1075,7 @@ static void ppc_emb_set_tb_clk (void *opaque, uint32_t freq)
}
#endif
tb_env->tb_freq = freq;
+ tb_env->decr_freq = freq;
/* XXX: we should also update all timers */
}
@@ -1029,6 +1091,7 @@ clk_setup_cb ppc_emb_timers_init (CPUState *env, uint32_t freq)
env->tb_env = tb_env;
ppcemb_timer = qemu_mallocz(sizeof(ppcemb_timer_t));
tb_env->tb_freq = freq;
+ tb_env->decr_freq = freq;
tb_env->opaque = ppcemb_timer;
#ifdef PPC_DEBUG_TB
if (loglevel != 0) {
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-15 15:40:51 +0000