diff options
author | Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com> | 2023-10-10 11:40:56 +0000 |
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committer | Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com> | 2023-10-10 11:40:56 +0000 |
commit | e02cda008591317b1625707ff8e115a4841aa889 (patch) | |
tree | aee302e3cf8b59ec2d32ec481be3d1afddfc8968 /hw/ppc/ppc_booke.c | |
parent | cc668e6b7e0ffd8c9d130513d12053cf5eda1d3b (diff) |
Introduce Virtio-loopback epsilon release:
Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.
Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9
Diffstat (limited to 'hw/ppc/ppc_booke.c')
-rw-r--r-- | hw/ppc/ppc_booke.c | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/hw/ppc/ppc_booke.c b/hw/ppc/ppc_booke.c new file mode 100644 index 000000000..10b643861 --- /dev/null +++ b/hw/ppc/ppc_booke.c @@ -0,0 +1,369 @@ +/* + * QEMU PowerPC Booke hardware System Emulator + * + * Copyright (c) 2011 AdaCore + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "qemu/osdep.h" +#include "cpu.h" +#include "hw/ppc/ppc.h" +#include "qemu/timer.h" +#include "sysemu/reset.h" +#include "sysemu/runstate.h" +#include "hw/loader.h" +#include "kvm_ppc.h" + + +/* Timer Control Register */ + +#define TCR_WP_SHIFT 30 /* Watchdog Timer Period */ +#define TCR_WP_MASK (0x3U << TCR_WP_SHIFT) +#define TCR_WRC_SHIFT 28 /* Watchdog Timer Reset Control */ +#define TCR_WRC_MASK (0x3U << TCR_WRC_SHIFT) +#define TCR_WIE (1U << 27) /* Watchdog Timer Interrupt Enable */ +#define TCR_DIE (1U << 26) /* Decrementer Interrupt Enable */ +#define TCR_FP_SHIFT 24 /* Fixed-Interval Timer Period */ +#define TCR_FP_MASK (0x3U << TCR_FP_SHIFT) +#define TCR_FIE (1U << 23) /* Fixed-Interval Timer Interrupt Enable */ +#define TCR_ARE (1U << 22) /* Auto-Reload Enable */ + +/* Timer Control Register (e500 specific fields) */ + +#define TCR_E500_FPEXT_SHIFT 13 /* Fixed-Interval Timer Period Extension */ +#define TCR_E500_FPEXT_MASK (0xf << TCR_E500_FPEXT_SHIFT) +#define TCR_E500_WPEXT_SHIFT 17 /* Watchdog Timer Period Extension */ +#define TCR_E500_WPEXT_MASK (0xf << TCR_E500_WPEXT_SHIFT) + +/* Timer Status Register */ + +#define TSR_FIS (1U << 26) /* Fixed-Interval Timer Interrupt Status */ +#define TSR_DIS (1U << 27) /* Decrementer Interrupt Status */ +#define TSR_WRS_SHIFT 28 /* Watchdog Timer Reset Status */ +#define TSR_WRS_MASK (0x3U << TSR_WRS_SHIFT) +#define TSR_WIS (1U << 30) /* Watchdog Timer Interrupt Status */ +#define TSR_ENW (1U << 31) /* Enable Next Watchdog Timer */ + +typedef struct booke_timer_t booke_timer_t; +struct booke_timer_t { + + uint64_t fit_next; + QEMUTimer *fit_timer; + + uint64_t wdt_next; + QEMUTimer *wdt_timer; + + uint32_t flags; +}; + +static void booke_update_irq(PowerPCCPU *cpu) +{ + CPUPPCState *env = &cpu->env; + + ppc_set_irq(cpu, PPC_INTERRUPT_DECR, + (env->spr[SPR_BOOKE_TSR] & TSR_DIS + && env->spr[SPR_BOOKE_TCR] & TCR_DIE)); + + ppc_set_irq(cpu, PPC_INTERRUPT_WDT, + (env->spr[SPR_BOOKE_TSR] & TSR_WIS + && env->spr[SPR_BOOKE_TCR] & TCR_WIE)); + + ppc_set_irq(cpu, PPC_INTERRUPT_FIT, + (env->spr[SPR_BOOKE_TSR] & TSR_FIS + && env->spr[SPR_BOOKE_TCR] & TCR_FIE)); +} + +/* Return the location of the bit of time base at which the FIT will raise an + interrupt */ +static uint8_t booke_get_fit_target(CPUPPCState *env, ppc_tb_t *tb_env) +{ + uint8_t fp = (env->spr[SPR_BOOKE_TCR] & TCR_FP_MASK) >> TCR_FP_SHIFT; + + if (tb_env->flags & PPC_TIMER_E500) { + /* e500 Fixed-interval timer period extension */ + uint32_t fpext = (env->spr[SPR_BOOKE_TCR] & TCR_E500_FPEXT_MASK) + >> TCR_E500_FPEXT_SHIFT; + fp = 63 - (fp | fpext << 2); + } else { + fp = env->fit_period[fp]; + } + + return fp; +} + +/* Return the location of the bit of time base at which the WDT will raise an + interrupt */ +static uint8_t booke_get_wdt_target(CPUPPCState *env, ppc_tb_t *tb_env) +{ + uint8_t wp = (env->spr[SPR_BOOKE_TCR] & TCR_WP_MASK) >> TCR_WP_SHIFT; + + if (tb_env->flags & PPC_TIMER_E500) { + /* e500 Watchdog timer period extension */ + uint32_t wpext = (env->spr[SPR_BOOKE_TCR] & TCR_E500_WPEXT_MASK) + >> TCR_E500_WPEXT_SHIFT; + wp = 63 - (wp | wpext << 2); + } else { + wp = env->wdt_period[wp]; + } + + return wp; +} + +static void booke_update_fixed_timer(CPUPPCState *env, + uint8_t target_bit, + uint64_t *next, + QEMUTimer *timer, + int tsr_bit) +{ + ppc_tb_t *tb_env = env->tb_env; + uint64_t delta_tick, ticks = 0; + uint64_t tb; + uint64_t period; + uint64_t now; + + if (!(env->spr[SPR_BOOKE_TSR] & tsr_bit)) { + /* + * Don't arm the timer again when the guest has the current + * interrupt still pending. Wait for it to ack it. + */ + return; + } + + now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + tb = cpu_ppc_get_tb(tb_env, now, tb_env->tb_offset); + period = 1ULL << target_bit; + delta_tick = period - (tb & (period - 1)); + + /* the timer triggers only when the selected bit toggles from 0 to 1 */ + if (tb & period) { + ticks = period; + } + + if (ticks + delta_tick < ticks) { + /* Overflow, so assume the biggest number we can express. */ + ticks = UINT64_MAX; + } else { + ticks += delta_tick; + } + + *next = now + muldiv64(ticks, NANOSECONDS_PER_SECOND, tb_env->tb_freq); + if ((*next < now) || (*next > INT64_MAX)) { + /* Overflow, so assume the biggest number the qemu timer supports. */ + *next = INT64_MAX; + } + + /* XXX: If expire time is now. We can't run the callback because we don't + * have access to it. So we just set the timer one nanosecond later. + */ + + if (*next == now) { + (*next)++; + } else { + /* + * There's no point to fake any granularity that's more fine grained + * than milliseconds. Anything beyond that just overloads the system. + */ + *next = MAX(*next, now + SCALE_MS); + } + + /* Fire the next timer */ + timer_mod(timer, *next); +} + +static void booke_decr_cb(void *opaque) +{ + PowerPCCPU *cpu = opaque; + CPUPPCState *env = &cpu->env; + + env->spr[SPR_BOOKE_TSR] |= TSR_DIS; + booke_update_irq(cpu); + + if (env->spr[SPR_BOOKE_TCR] & TCR_ARE) { + /* Do not reload 0, it is already there. It would just trigger + * the timer again and lead to infinite loop */ + if (env->spr[SPR_BOOKE_DECAR] != 0) { + /* Auto Reload */ + cpu_ppc_store_decr(env, env->spr[SPR_BOOKE_DECAR]); + } + } +} + +static void booke_fit_cb(void *opaque) +{ + PowerPCCPU *cpu = opaque; + CPUPPCState *env = &cpu->env; + ppc_tb_t *tb_env; + booke_timer_t *booke_timer; + + tb_env = env->tb_env; + booke_timer = tb_env->opaque; + env->spr[SPR_BOOKE_TSR] |= TSR_FIS; + + booke_update_irq(cpu); + + booke_update_fixed_timer(env, + booke_get_fit_target(env, tb_env), + &booke_timer->fit_next, + booke_timer->fit_timer, + TSR_FIS); +} + +static void booke_wdt_cb(void *opaque) +{ + PowerPCCPU *cpu = opaque; + CPUPPCState *env = &cpu->env; + ppc_tb_t *tb_env; + booke_timer_t *booke_timer; + + tb_env = env->tb_env; + booke_timer = tb_env->opaque; + + /* TODO: There's lots of complicated stuff to do here */ + + booke_update_irq(cpu); + + booke_update_fixed_timer(env, + booke_get_wdt_target(env, tb_env), + &booke_timer->wdt_next, + booke_timer->wdt_timer, + TSR_WIS); +} + +void store_booke_tsr(CPUPPCState *env, target_ulong val) +{ + PowerPCCPU *cpu = env_archcpu(env); + ppc_tb_t *tb_env = env->tb_env; + booke_timer_t *booke_timer = tb_env->opaque; + + env->spr[SPR_BOOKE_TSR] &= ~val; + kvmppc_clear_tsr_bits(cpu, val); + + if (val & TSR_FIS) { + booke_update_fixed_timer(env, + booke_get_fit_target(env, tb_env), + &booke_timer->fit_next, + booke_timer->fit_timer, + TSR_FIS); + } + + if (val & TSR_WIS) { + booke_update_fixed_timer(env, + booke_get_wdt_target(env, tb_env), + &booke_timer->wdt_next, + booke_timer->wdt_timer, + TSR_WIS); + } + + booke_update_irq(cpu); +} + +void store_booke_tcr(CPUPPCState *env, target_ulong val) +{ + PowerPCCPU *cpu = env_archcpu(env); + ppc_tb_t *tb_env = env->tb_env; + booke_timer_t *booke_timer = tb_env->opaque; + + env->spr[SPR_BOOKE_TCR] = val; + kvmppc_set_tcr(cpu); + + booke_update_irq(cpu); + + booke_update_fixed_timer(env, + booke_get_fit_target(env, tb_env), + &booke_timer->fit_next, + booke_timer->fit_timer, + TSR_FIS); + + booke_update_fixed_timer(env, + booke_get_wdt_target(env, tb_env), + &booke_timer->wdt_next, + booke_timer->wdt_timer, + TSR_WIS); +} + +static void ppc_booke_timer_reset_handle(void *opaque) +{ + PowerPCCPU *cpu = opaque; + CPUPPCState *env = &cpu->env; + + store_booke_tcr(env, 0); + store_booke_tsr(env, -1); +} + +/* + * This function will be called whenever the CPU state changes. + * CPU states are defined "typedef enum RunState". + * Regarding timer, When CPU state changes to running after debug halt + * or similar cases which takes time then in between final watchdog + * expiry happenes. This will cause exit to QEMU and configured watchdog + * action will be taken. To avoid this we always clear the watchdog state when + * state changes to running. + */ +static void cpu_state_change_handler(void *opaque, bool running, RunState state) +{ + PowerPCCPU *cpu = opaque; + CPUPPCState *env = &cpu->env; + + if (!running) { + return; + } + + /* + * Clear watchdog interrupt condition by clearing TSR. + */ + store_booke_tsr(env, TSR_ENW | TSR_WIS | TSR_WRS_MASK); +} + +void ppc_booke_timers_init(PowerPCCPU *cpu, uint32_t freq, uint32_t flags) +{ + ppc_tb_t *tb_env; + booke_timer_t *booke_timer; + int ret = 0; + + tb_env = g_malloc0(sizeof(ppc_tb_t)); + booke_timer = g_malloc0(sizeof(booke_timer_t)); + + cpu->env.tb_env = tb_env; + tb_env->flags = flags | PPC_TIMER_BOOKE | PPC_DECR_ZERO_TRIGGERED; + + tb_env->tb_freq = freq; + tb_env->decr_freq = freq; + tb_env->opaque = booke_timer; + tb_env->decr_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, &booke_decr_cb, cpu); + + booke_timer->fit_timer = + timer_new_ns(QEMU_CLOCK_VIRTUAL, &booke_fit_cb, cpu); + booke_timer->wdt_timer = + timer_new_ns(QEMU_CLOCK_VIRTUAL, &booke_wdt_cb, cpu); + + ret = kvmppc_booke_watchdog_enable(cpu); + + if (ret) { + /* TODO: Start the QEMU emulated watchdog if not running on KVM. + * Also start the QEMU emulated watchdog if KVM does not support + * emulated watchdog or somehow it is not enabled (supported but + * not enabled is though some bug and requires debugging :)). + */ + } + + qemu_add_vm_change_state_handler(cpu_state_change_handler, cpu); + + qemu_register_reset(ppc_booke_timer_reset_handle, cpu); +} |