From dbdd25065e90ba78c01b03d238785f25476c04a1 Mon Sep 17 00:00:00 2001 From: j_mayer Date: Sun, 14 Oct 2007 09:35:30 +0000 Subject: Implement time-base start/stop helpers. Implement PowerPC 6xx time-base enable input pin. git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3394 c046a42c-6fe2-441c-8c8c-71466251a162 --- hw/ppc.c | 121 ++++++++++++++++++++++++++++++++++++++++++++++++--------------- 1 file changed, 92 insertions(+), 29 deletions(-) (limited to 'hw') diff --git a/hw/ppc.c b/hw/ppc.c index 2fd3a4e..742d3de 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) { -- cgit v1.1