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PowerPC merge: real time TB and decrementer - faster and simpler exception handling (Jocelyn Mayer)
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@841 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard
parent
4a0fb71e67
commit
9fddaa0c0c
14 changed files with 475 additions and 309 deletions
175
hw/ppc.c
175
hw/ppc.c
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@ -28,6 +28,181 @@ void ppc_prep_init (int ram_size, int vga_ram_size, int boot_device,
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const char *kernel_filename, const char *kernel_cmdline,
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const char *initrd_filename);
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/*****************************************************************************/
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/* PPC time base and decrementer emulation */
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//#define DEBUG_TB
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struct ppc_tb_t {
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/* Time base management */
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int64_t tb_offset; /* Compensation */
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uint32_t tb_freq; /* TB frequency */
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/* Decrementer management */
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uint64_t decr_next; /* Tick for next decr interrupt */
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struct QEMUTimer *decr_timer;
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};
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static inline uint64_t cpu_ppc_get_tb (ppc_tb_t *tb_env)
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{
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/* TB time in tb periods */
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return muldiv64(qemu_get_clock(vm_clock) + tb_env->tb_offset,
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tb_env->tb_freq, ticks_per_sec);
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}
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uint32_t cpu_ppc_load_tbl (CPUState *env)
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{
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ppc_tb_t *tb_env = env->tb_env;
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uint64_t tb;
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tb = cpu_ppc_get_tb(tb_env);
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#ifdef DEBUG_TB
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{
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static int last_time;
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int now;
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now = time(NULL);
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if (last_time != now) {
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last_time = now;
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printf("%s: tb=0x%016lx %d %08lx\n",
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__func__, tb, now, tb_env->tb_offset);
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}
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}
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#endif
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return tb & 0xFFFFFFFF;
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}
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uint32_t cpu_ppc_load_tbu (CPUState *env)
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{
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ppc_tb_t *tb_env = env->tb_env;
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uint64_t tb;
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tb = cpu_ppc_get_tb(tb_env);
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#ifdef DEBUG_TB
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printf("%s: tb=0x%016lx\n", __func__, tb);
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#endif
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return tb >> 32;
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}
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static void cpu_ppc_store_tb (ppc_tb_t *tb_env, uint64_t value)
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{
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tb_env->tb_offset = muldiv64(value, ticks_per_sec, tb_env->tb_freq)
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- qemu_get_clock(vm_clock);
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#ifdef DEBUG_TB
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printf("%s: tb=0x%016lx offset=%08x\n", __func__, value);
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#endif
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}
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void cpu_ppc_store_tbu (CPUState *env, uint32_t value)
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{
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ppc_tb_t *tb_env = env->tb_env;
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cpu_ppc_store_tb(tb_env,
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((uint64_t)value << 32) | cpu_ppc_load_tbl(env));
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}
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void cpu_ppc_store_tbl (CPUState *env, uint32_t value)
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{
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ppc_tb_t *tb_env = env->tb_env;
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cpu_ppc_store_tb(tb_env,
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((uint64_t)cpu_ppc_load_tbu(env) << 32) | value);
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}
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uint32_t cpu_ppc_load_decr (CPUState *env)
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{
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ppc_tb_t *tb_env = env->tb_env;
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uint32_t decr;
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decr = muldiv64(tb_env->decr_next - qemu_get_clock(vm_clock),
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tb_env->tb_freq, ticks_per_sec);
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#ifdef DEBUG_TB
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printf("%s: 0x%08x\n", __func__, decr);
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#endif
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return decr;
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}
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/* When decrementer expires,
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* all we need to do is generate or queue a CPU exception
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*/
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static inline void cpu_ppc_decr_excp (CPUState *env)
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{
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/* Raise it */
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#ifdef DEBUG_TB
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printf("raise decrementer exception\n");
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#endif
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cpu_interrupt(env, CPU_INTERRUPT_TIMER);
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}
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static void _cpu_ppc_store_decr (CPUState *env, uint32_t decr,
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uint32_t value, int is_excp)
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{
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ppc_tb_t *tb_env = env->tb_env;
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uint64_t now, next;
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#ifdef DEBUG_TB
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printf("%s: 0x%08x => 0x%08x\n", __func__, decr, value);
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#endif
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now = qemu_get_clock(vm_clock);
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next = now + muldiv64(value, ticks_per_sec, tb_env->tb_freq);
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if (is_excp)
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next += tb_env->decr_next - now;
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if (next == now)
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next++;
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tb_env->decr_next = next;
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/* Adjust timer */
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qemu_mod_timer(tb_env->decr_timer, next);
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/* If we set a negative value and the decrementer was positive,
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* raise an exception.
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*/
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if ((value & 0x80000000) && !(decr & 0x80000000))
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cpu_ppc_decr_excp(env);
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}
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void cpu_ppc_store_decr (CPUState *env, uint32_t value)
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{
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_cpu_ppc_store_decr(env, cpu_ppc_load_decr(env), value, 0);
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}
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static void cpu_ppc_decr_cb (void *opaque)
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{
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_cpu_ppc_store_decr(opaque, 0x00000000, 0xFFFFFFFF, 1);
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}
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/* Set up (once) timebase frequency (in Hz) */
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ppc_tb_t *cpu_ppc_tb_init (CPUState *env, uint32_t freq)
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{
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ppc_tb_t *tb_env;
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tb_env = qemu_mallocz(sizeof(ppc_tb_t));
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if (tb_env == NULL)
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return NULL;
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env->tb_env = tb_env;
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if (tb_env->tb_freq == 0 || 1) {
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tb_env->tb_freq = freq;
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/* Create new timer */
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tb_env->decr_timer =
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qemu_new_timer(vm_clock, &cpu_ppc_decr_cb, env);
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/* There is a bug in 2.4 kernels:
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* if a decrementer exception is pending when it enables msr_ee,
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* it's not ready to handle it...
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*/
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_cpu_ppc_store_decr(env, 0xFFFFFFFF, 0xFFFFFFFF, 0);
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}
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return tb_env;
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}
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#if 0
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/*****************************************************************************/
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/* Handle system reset (for now, just stop emulation) */
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void cpu_ppc_reset (CPUState *env)
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{
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printf("Reset asked... Stop emulation\n");
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abort();
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}
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#endif
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/*****************************************************************************/
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void ppc_init (int ram_size, int vga_ram_size, int boot_device,
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DisplayState *ds, const char **fd_filename, int snapshot,
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const char *kernel_filename, const char *kernel_cmdline,
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