acpi: Add IORT helper functions

[coreboot2.git] / src / lib / hardwaremain.c

/* SPDX-License-Identifier: GPL-2.0-only */


/*
 * C Bootstrap code for the coreboot
 */

#include <acpi/acpi.h>
#include <acpi/acpi_gnvs.h>
#include <adainit.h>
#include <arch/exception.h>
#include <boot/tables.h>
#include <bootstate.h>
#include <cbmem.h>
#include <commonlib/console/post_codes.h>
#include <commonlib/helpers.h>
#include <console/console.h>
#include <delay.h>
#include <device/device.h>
#include <device/pci.h>
#include <program_loading.h>
#include <thread.h>
#include <timer.h>
#include <timestamp.h>
#include <types.h>

static boot_state_t bs_pre_device(void *arg);
static boot_state_t bs_dev_init_chips(void *arg);
static boot_state_t bs_dev_enumerate(void *arg);
static boot_state_t bs_dev_resources(void *arg);
static boot_state_t bs_dev_enable(void *arg);
static boot_state_t bs_dev_init(void *arg);
static boot_state_t bs_post_device(void *arg);
static boot_state_t bs_os_resume_check(void *arg);
static boot_state_t bs_os_resume(void *arg);
static boot_state_t bs_write_tables(void *arg);
static boot_state_t bs_payload_load(void *arg);
static boot_state_t bs_payload_boot(void *arg);

/* The prologue (BS_ON_ENTRY) and epilogue (BS_ON_EXIT) of a state can be
 * blocked from transitioning to the next (state,seq) pair. When the blockers
 * field is 0 a transition may occur. */
struct boot_phase {
        struct boot_state_callback *callbacks;
        int blockers;
};

struct boot_state {
        const char *name;
        boot_state_t id;
        u8 post_code;
        struct boot_phase phases[2];
        boot_state_t (*run_state)(void *arg);
        void *arg;
        int num_samples;
        bool complete;
};

#define BS_INIT(state_, run_func_)                              \
        {                                                       \
                .name = #state_,                                \
                .id = state_,                                   \
                .post_code = POSTCODE_ ## state_,               \
                .phases = { { NULL, 0 }, { NULL, 0 } },         \
                .run_state = run_func_,                         \
                .arg = NULL,                                    \
                .complete = false,                              \
        }
#define BS_INIT_ENTRY(state_, run_func_)        \
        [state_] = BS_INIT(state_, run_func_)

static struct boot_state boot_states[] = {
        BS_INIT_ENTRY(BS_PRE_DEVICE, bs_pre_device),
        BS_INIT_ENTRY(BS_DEV_INIT_CHIPS, bs_dev_init_chips),
        BS_INIT_ENTRY(BS_DEV_ENUMERATE, bs_dev_enumerate),
        BS_INIT_ENTRY(BS_DEV_RESOURCES, bs_dev_resources),
        BS_INIT_ENTRY(BS_DEV_ENABLE, bs_dev_enable),
        BS_INIT_ENTRY(BS_DEV_INIT, bs_dev_init),
        BS_INIT_ENTRY(BS_POST_DEVICE, bs_post_device),
        BS_INIT_ENTRY(BS_OS_RESUME_CHECK, bs_os_resume_check),
        BS_INIT_ENTRY(BS_OS_RESUME, bs_os_resume),
        BS_INIT_ENTRY(BS_WRITE_TABLES, bs_write_tables),
        BS_INIT_ENTRY(BS_PAYLOAD_LOAD, bs_payload_load),
        BS_INIT_ENTRY(BS_PAYLOAD_BOOT, bs_payload_boot),
};

void __weak arch_bootstate_coreboot_exit(void) { }

static boot_state_t bs_pre_device(void *arg)
{
        return BS_DEV_INIT_CHIPS;
}

static boot_state_t bs_dev_init_chips(void *arg)
{
        timestamp_add_now(TS_DEVICE_ENUMERATE);

        /* Initialize chips early, they might disable unused devices. */
        dev_initialize_chips();

        return BS_DEV_ENUMERATE;
}

static boot_state_t bs_dev_enumerate(void *arg)
{
        /* Find the devices we don't have hard coded knowledge about. */
        dev_enumerate();

        return BS_DEV_RESOURCES;
}

static boot_state_t bs_dev_resources(void *arg)
{
        timestamp_add_now(TS_DEVICE_CONFIGURE);

        /* Now compute and assign the bus resources. */
        dev_configure();

        return BS_DEV_ENABLE;
}

static boot_state_t bs_dev_enable(void *arg)
{
        timestamp_add_now(TS_DEVICE_ENABLE);

        /* Now actually enable devices on the bus */
        dev_enable();

        return BS_DEV_INIT;
}

static boot_state_t bs_dev_init(void *arg)
{
        timestamp_add_now(TS_DEVICE_INITIALIZE);

        /* And of course initialize devices on the bus */
        dev_initialize();

        return BS_POST_DEVICE;
}

static boot_state_t bs_post_device(void *arg)
{
        dev_finalize();
        timestamp_add_now(TS_DEVICE_DONE);

        return BS_OS_RESUME_CHECK;
}

static boot_state_t bs_os_resume_check(void *arg)
{
        void *wake_vector = NULL;

        if (CONFIG(HAVE_ACPI_RESUME))
                wake_vector = acpi_find_wakeup_vector();

        if (wake_vector != NULL) {
                boot_states[BS_OS_RESUME].arg = wake_vector;
                return BS_OS_RESUME;
        }

        timestamp_add_now(TS_CBMEM_POST);

        return BS_WRITE_TABLES;
}

static boot_state_t bs_os_resume(void *wake_vector)
{
        if (CONFIG(HAVE_ACPI_RESUME)) {
                arch_bootstate_coreboot_exit();
                acpi_resume(wake_vector);
                /* We will not come back. */
        }
        die("Failed OS resume\n");
}

static boot_state_t bs_write_tables(void *arg)
{
        timestamp_add_now(TS_WRITE_TABLES);

        /* Now that we have collected all of our information
         * write our configuration tables.
         */
        write_tables();

        timestamp_add_now(TS_FINALIZE_CHIPS);
        dev_finalize_chips();

        return BS_PAYLOAD_LOAD;
}

static boot_state_t bs_payload_load(void *arg)
{
        payload_load();

        return BS_PAYLOAD_BOOT;
}

static boot_state_t bs_payload_boot(void *arg)
{
        arch_bootstate_coreboot_exit();
        payload_run();

        printk(BIOS_EMERG, "Boot failed\n");
        /* Returning from this state will fail because the following signals
         * return to a completed state. */
        return BS_PAYLOAD_BOOT;
}

/*
 * Typically a state will take 4 time samples:
 *   1. Before state entry callbacks
 *   2. After state entry callbacks / Before state function.
 *   3. After state function / Before state exit callbacks.
 *   4. After state exit callbacks.
 */
static void bs_sample_time(struct boot_state *state)
{
        static const char *const sample_id[] = { "entry", "run", "exit" };
        static struct mono_time previous_sample;
        struct mono_time this_sample;
        long console;

        if (!CONFIG(HAVE_MONOTONIC_TIMER))
                return;

        console = console_time_get_and_reset();
        timer_monotonic_get(&this_sample);
        state->num_samples++;

        int i = state->num_samples - 2;
        if ((i >= 0) && (i < ARRAY_SIZE(sample_id))) {
                long execution = mono_time_diff_microseconds(&previous_sample, &this_sample);

                /* Report with millisecond precision to reduce log diffs. */
                execution = DIV_ROUND_CLOSEST(execution, USECS_PER_MSEC);
                console = DIV_ROUND_CLOSEST(console, USECS_PER_MSEC);
                if (execution) {
                        printk(BIOS_DEBUG, "BS: %s %s times (exec / console): %ld / %ld ms\n",
                                state->name, sample_id[i], execution - console, console);
                        /* Reset again to ignore printk() time above. */
                        console_time_get_and_reset();
                }
        }
        timer_monotonic_get(&previous_sample);
}

#if CONFIG(TIMER_QUEUE)
static void bs_run_timers(int drain)
{
        /* Drain all timer callbacks until none are left, if directed.
         * Otherwise run the timers only once. */
        do {
                if (!timers_run())
                        break;
        } while (drain);
}
#else
static void bs_run_timers(int drain) {}
#endif

static void bs_call_callbacks(struct boot_state *state,
                              boot_state_sequence_t seq)
{
        struct boot_phase *phase = &state->phases[seq];
        struct mono_time mt_start, mt_stop;

        while (1) {
                if (phase->callbacks != NULL) {
                        struct boot_state_callback *bscb;

                        /* Remove the first callback. */
                        bscb = phase->callbacks;
                        phase->callbacks = bscb->next;
                        bscb->next = NULL;

                        if (CONFIG(DEBUG_BOOT_STATE)) {
                                printk(BIOS_DEBUG, "BS: callback (%p) @ %s.\n",
                                        bscb, bscb_location(bscb));
                                timer_monotonic_get(&mt_start);
                        }
                        bscb->callback(bscb->arg);
                        if (CONFIG(DEBUG_BOOT_STATE)) {
                                timer_monotonic_get(&mt_stop);
                                printk(BIOS_DEBUG, "BS: callback (%p) @ %s (%lld ms).\n", bscb,
                                       bscb_location(bscb),
                                       mono_time_diff_microseconds(&mt_start, &mt_stop)
                                               / USECS_PER_MSEC);
                        }

                        bs_run_timers(0);

                        continue;
                }

                /* All callbacks are complete and there are no blockers for
                 * this state. Therefore, this part of the state is complete. */
                if (!phase->blockers)
                        break;

                /* Something is blocking this state from transitioning. As
                 * there are no more callbacks a pending timer needs to be
                 * ran to unblock the state. */
                bs_run_timers(0);
        }
}

/* Keep track of the current state. */
static struct state_tracker {
        boot_state_t state_id;
        boot_state_sequence_t seq;
} current_phase = {
        .state_id = BS_PRE_DEVICE,
        .seq = BS_ON_ENTRY,
};

static void bs_walk_state_machine(void)
{
        while (1) {
                struct boot_state *state;
                boot_state_t next_id;

                state = &boot_states[current_phase.state_id];

                if (state->complete) {
                        printk(BIOS_EMERG, "BS: %s state already executed.\n",
                               state->name);
                        break;
                }

                if (CONFIG(DEBUG_BOOT_STATE))
                        printk(BIOS_DEBUG, "BS: Entering %s state.\n",
                                state->name);

                bs_run_timers(0);

                bs_sample_time(state);

                bs_call_callbacks(state, current_phase.seq);
                /* Update the current sequence so that any calls to block the
                 * current state from the run_state() function will place a
                 * block on the correct phase. */
                current_phase.seq = BS_ON_EXIT;

                bs_sample_time(state);

                post_code(state->post_code);

                next_id = state->run_state(state->arg);

                if (CONFIG(DEBUG_BOOT_STATE))
                        printk(BIOS_DEBUG, "BS: Exiting %s state.\n",
                        state->name);

                bs_sample_time(state);

                bs_run_timers(0);

                bs_call_callbacks(state, current_phase.seq);

                if (CONFIG(DEBUG_BOOT_STATE))
                        printk(BIOS_DEBUG,
                                "----------------------------------------\n");

                /* Update the current phase with new state id and sequence. */
                current_phase.state_id = next_id;
                current_phase.seq = BS_ON_ENTRY;

                bs_sample_time(state);

                state->complete = true;
        }
}

static int boot_state_sched_callback(struct boot_state *state,
                                     struct boot_state_callback *bscb,
                                     boot_state_sequence_t seq)
{
        if (state->complete) {
                printk(BIOS_WARNING,
                       "Tried to schedule callback on completed state %s.\n",
                       state->name);

                return -1;
        }

        bscb->next = state->phases[seq].callbacks;
        state->phases[seq].callbacks = bscb;

        return 0;
}

int boot_state_sched_on_entry(struct boot_state_callback *bscb,
                              boot_state_t state_id)
{
        struct boot_state *state = &boot_states[state_id];

        return boot_state_sched_callback(state, bscb, BS_ON_ENTRY);
}

int boot_state_sched_on_exit(struct boot_state_callback *bscb,
                             boot_state_t state_id)
{
        struct boot_state *state = &boot_states[state_id];

        return boot_state_sched_callback(state, bscb, BS_ON_EXIT);
}

static void boot_state_schedule_static_entries(void)
{
        extern struct boot_state_init_entry *_bs_init_begin[];
        struct boot_state_init_entry **slot;

        for (slot = &_bs_init_begin[0]; *slot != NULL; slot++) {
                struct boot_state_init_entry *cur = *slot;

                if (cur->when == BS_ON_ENTRY)
                        boot_state_sched_on_entry(&cur->bscb, cur->state);
                else
                        boot_state_sched_on_exit(&cur->bscb, cur->state);
        }
}

void main(void)
{
        /*
         * We can generally jump between C and Ada code back and forth
         * without trouble. But since we don't have an Ada main() we
         * have to do some Ada package initializations that GNAT would
         * do there. This has to be done before calling any Ada code.
         *
         * The package initializations should not have any dependen-
         * cies on C code. So we can call them here early, and don't
         * have to worry at which point we can start to use Ada.
         */
        ramstage_adainit();

        /* TODO: Understand why this is here and move to arch/platform code. */
        /* For MMIO UART this needs to be called before any other printk. */
        if (ENV_X86)
                init_timer();

        /* console_init() MUST PRECEDE ALL printk()! Additionally, ensure
         * it is the very first thing done in ramstage.*/
        console_init();
        post_code(POSTCODE_CONSOLE_READY);

        exception_init();

        /*
         * CBMEM needs to be recovered because timestamps, ACPI, etc rely on
         * the cbmem infrastructure being around. Explicitly recover it.
         */
        cbmem_initialize();

        timestamp_add_now(TS_RAMSTAGE_START);
        post_code(POSTCODE_ENTRY_HARDWAREMAIN);

        /* Handoff sleep type from romstage. */
        acpi_is_wakeup_s3();

        /* Schedule the static boot state entries. */
        boot_state_schedule_static_entries();

        bs_walk_state_machine();

        die("Boot state machine failure.\n");
}


int boot_state_block(boot_state_t state, boot_state_sequence_t seq)
{
        struct boot_phase *bp;

        /* Blocking a previously ran state is not appropriate. */
        if (current_phase.state_id > state ||
            (current_phase.state_id == state && current_phase.seq > seq)) {
                printk(BIOS_WARNING,
                       "BS: Completed state (%d, %d) block attempted.\n",
                       state, seq);
                return -1;
        }

        bp = &boot_states[state].phases[seq];
        bp->blockers++;

        return 0;
}

int boot_state_unblock(boot_state_t state, boot_state_sequence_t seq)
{
        struct boot_phase *bp;

        /* Blocking a previously ran state is not appropriate. */
        if (current_phase.state_id > state ||
            (current_phase.state_id == state && current_phase.seq > seq)) {
                printk(BIOS_WARNING,
                       "BS: Completed state (%d, %d) unblock attempted.\n",
                       state, seq);
                return -1;
        }

        bp = &boot_states[state].phases[seq];

        if (bp->blockers == 0) {
                printk(BIOS_WARNING,
                       "BS: Unblock attempted on non-blocked state (%d, %d).\n",
                       state, seq);
                return -1;
        }

        bp->blockers--;

        return 0;
}