block: add NVMe boot support

This patch enables SeaBIOS to boot from NVMe. Finding namespaces and
basic I/O works. Testing has been done in qemu and so far it works with
Grub, syslinux, and the FreeBSD loader. You need a recent Qemu (>=
2.7.0), because older versions have buggy NVMe support.

The NVMe code is currently only enabled on Qemu due to lack of testing
on real hardware.

Signed-off-by: Julian Stecklina <jsteckli@amazon.de>
diff --git a/src/hw/nvme.c b/src/hw/nvme.c
new file mode 100644
index 0000000..31edf29
--- /dev/null
+++ b/src/hw/nvme.c
@@ -0,0 +1,655 @@
+// Low level NVMe disk access
+//
+// Copyright 2017 Amazon.com, Inc. or its affiliates.
+//
+// This file may be distributed under the terms of the GNU LGPLv3 license.
+
+#include "blockcmd.h"
+#include "fw/paravirt.h" // runningOnQEMU
+#include "malloc.h" // malloc_high
+#include "output.h" // dprintf
+#include "pci.h"
+#include "pci_ids.h" // PCI_CLASS_STORAGE_NVME
+#include "pci_regs.h" // PCI_BASE_ADDRESS_0
+#include "pcidevice.h" // foreachpci
+#include "stacks.h" // yield
+#include "std/disk.h" // DISK_RET_
+#include "string.h" // memset
+#include "util.h" // boot_add_hd
+#include "x86.h" // readl
+
+#include "nvme.h"
+#include "nvme-int.h"
+
+static void *
+zalloc_page_aligned(struct zone_s *zone, u32 size)
+{
+    void *res = _malloc(zone, size, NVME_PAGE_SIZE);
+    if (res) memset(res, 0, size);
+    return res;
+}
+
+static void
+nvme_init_queue_common(struct nvme_ctrl *ctrl, struct nvme_queue *q, u16 q_idx,
+                       u16 length)
+{
+    memset(q, 0, sizeof(*q));
+    q->dbl = (u32 *)((char *)ctrl->reg + 0x1000 + q_idx * ctrl->doorbell_stride);
+    dprintf(3, " q %p q_idx %u dbl %p\n", q, q_idx, q->dbl);
+    q->mask = length - 1;
+}
+
+static void
+nvme_init_sq(struct nvme_ctrl *ctrl, struct nvme_sq *sq, u16 q_idx, u16 length,
+             struct nvme_cq *cq)
+{
+    nvme_init_queue_common(ctrl, &sq->common, q_idx, length);
+    sq->sqe = zalloc_page_aligned(&ZoneHigh, sizeof(*sq->sqe) * length);
+    dprintf(3, "sq %p q_idx %u sqe %p\n", sq, q_idx, sq->sqe);
+    sq->cq   = cq;
+    sq->head = 0;
+    sq->tail = 0;
+}
+
+static void
+nvme_init_cq(struct nvme_ctrl *ctrl, struct nvme_cq *cq, u16 q_idx, u16 length)
+{
+    nvme_init_queue_common(ctrl, &cq->common, q_idx, length);
+    cq->cqe = zalloc_page_aligned(&ZoneHigh, sizeof(*cq->cqe) * length);
+
+    cq->head = 0;
+
+    /* All CQE phase bits are initialized to zero. This means initially we wait
+       for the host controller to set these to 1. */
+    cq->phase = 1;
+}
+
+static int
+nvme_poll_cq(struct nvme_cq *cq)
+{
+    u32 dw3 = readl(&cq->cqe[cq->head].dword[3]);
+    return (!!(dw3 & NVME_CQE_DW3_P) == cq->phase);
+}
+
+static int
+nvme_is_cqe_success(struct nvme_cqe const *cqe)
+{
+    return (cqe->status & 0xFF) >> 1 == 0;
+}
+
+
+static struct nvme_cqe
+nvme_error_cqe(void)
+{
+    struct nvme_cqe r;
+
+    /* 0xFF is a vendor specific status code != success. Should be okay for
+       indicating failure. */
+    memset(&r, 0xFF, sizeof(r));
+    return r;
+}
+
+static struct nvme_cqe
+nvme_consume_cqe(struct nvme_sq *sq)
+{
+    struct nvme_cq *cq = sq->cq;
+
+    if (!nvme_poll_cq(cq)) {
+        /* Cannot consume a completion queue entry, if there is none ready. */
+        return nvme_error_cqe();
+    }
+
+    struct nvme_cqe *cqe = &cq->cqe[cq->head];
+    u16 cq_next_head = (cq->head + 1) & cq->common.mask;
+    dprintf(4, "cq %p head %u -> %u\n", cq, cq->head, cq_next_head);
+    if (cq_next_head < cq->head) {
+        dprintf(3, "cq %p wrap\n", cq);
+        cq->phase = ~cq->phase;
+    }
+    cq->head = cq_next_head;
+
+    /* Update the submission queue head. */
+    if (cqe->sq_head != sq->head) {
+        sq->head = cqe->sq_head;
+        dprintf(4, "sq %p advanced to %u\n", sq, cqe->sq_head);
+    }
+
+    /* Tell the controller that we consumed the completion. */
+    writel(cq->common.dbl, cq->head);
+
+    return *cqe;
+}
+
+static struct nvme_cqe
+nvme_wait(struct nvme_sq *sq)
+{
+    static const unsigned nvme_timeout = 500 /* ms */;
+    u32 to = timer_calc(nvme_timeout);
+    while (!nvme_poll_cq(sq->cq)) {
+        yield();
+
+        if (timer_check(to)) {
+            warn_timeout();
+            return nvme_error_cqe();
+        }
+    }
+
+    return nvme_consume_cqe(sq);
+}
+
+/* Returns the next submission queue entry (or NULL if the queue is full). It
+   also fills out Command Dword 0 and clears the rest. */
+static struct nvme_sqe *
+nvme_get_next_sqe(struct nvme_sq *sq, u8 opc, void *metadata, void *data)
+{
+    if (((sq->head + 1) & sq->common.mask) == sq->tail) {
+        dprintf(3, "submission queue is full");
+        return NULL;
+    }
+
+    struct nvme_sqe *sqe = &sq->sqe[sq->tail];
+    dprintf(4, "sq %p next_sqe %u\n", sq, sq->tail);
+
+    memset(sqe, 0, sizeof(*sqe));
+    sqe->cdw0 = opc | (sq->tail << 16 /* CID */);
+    sqe->mptr = (u32)metadata;
+    sqe->dptr_prp1 = (u32)data;
+
+    if (sqe->dptr_prp1 & (NVME_PAGE_SIZE - 1)) {
+        /* Data buffer not page aligned. */
+        warn_internalerror();
+    }
+
+    return sqe;
+}
+
+/* Call this after you've filled out an sqe that you've got from nvme_get_next_sqe. */
+static void
+nvme_commit_sqe(struct nvme_sq *sq)
+{
+    dprintf(4, "sq %p commit_sqe %u\n", sq, sq->tail);
+    sq->tail = (sq->tail + 1) & sq->common.mask;
+    writel(sq->common.dbl, sq->tail);
+}
+
+/* Perform an identify command on the admin queue and return the resulting
+   buffer. This may be a NULL pointer, if something failed. This function
+   cannot be used after initialization, because it uses buffers in tmp zone. */
+static union nvme_identify *
+nvme_admin_identify(struct nvme_ctrl *ctrl, u8 cns, u32 nsid)
+{
+    union nvme_identify *identify_buf = zalloc_page_aligned(&ZoneTmpHigh, 4096);
+    if (!identify_buf) {
+        /* Could not allocate identify buffer. */
+        warn_internalerror();
+        return NULL;
+    }
+
+    struct nvme_sqe *cmd_identify;
+    cmd_identify = nvme_get_next_sqe(&ctrl->admin_sq,
+                                     NVME_SQE_OPC_ADMIN_IDENTIFY, NULL,
+                                     identify_buf);
+
+    if (!cmd_identify) {
+        warn_internalerror();
+        goto error;
+    }
+
+    cmd_identify->nsid = nsid;
+    cmd_identify->dword[10] = cns;
+
+    nvme_commit_sqe(&ctrl->admin_sq);
+
+    struct nvme_cqe cqe = nvme_wait(&ctrl->admin_sq);
+
+    if (!nvme_is_cqe_success(&cqe)) {
+        goto error;
+    }
+
+    return identify_buf;
+ error:
+    free(identify_buf);
+    return NULL;
+}
+
+static struct nvme_identify_ctrl *
+nvme_admin_identify_ctrl(struct nvme_ctrl *ctrl)
+{
+    return &nvme_admin_identify(ctrl, NVME_ADMIN_IDENTIFY_CNS_ID_CTRL, 0)->ctrl;
+}
+
+static struct nvme_identify_ns_list *
+nvme_admin_identify_get_ns_list(struct nvme_ctrl *ctrl)
+{
+    return &nvme_admin_identify(ctrl, NVME_ADMIN_IDENTIFY_CNS_GET_NS_LIST,
+                                0)->ns_list;
+}
+
+static struct nvme_identify_ns *
+nvme_admin_identify_ns(struct nvme_ctrl *ctrl, u32 ns_id)
+{
+    return &nvme_admin_identify(ctrl, NVME_ADMIN_IDENTIFY_CNS_ID_NS,
+                                ns_id)->ns;
+}
+
+static void
+nvme_probe_ns(struct nvme_ctrl *ctrl, struct nvme_namespace *ns, u32 ns_id)
+{
+    ns->ctrl  = ctrl;
+    ns->ns_id = ns_id;
+
+    struct nvme_identify_ns *id = nvme_admin_identify_ns(ctrl, ns_id);
+    if (!id) {
+        dprintf(2, "NVMe couldn't identify namespace %u.\n", ns_id);
+        goto free_buffer;
+    }
+
+    u8 current_lba_format = id->flbas & 0xF;
+    if (current_lba_format > id->nlbaf) {
+        dprintf(2, "NVMe NS %u: current LBA format %u is beyond what the "
+                " namespace supports (%u)?\n",
+                ns_id, current_lba_format, id->nlbaf + 1);
+        goto free_buffer;
+    }
+
+    ns->lba_count = id->nsze;
+
+    struct nvme_lba_format *fmt = &id->lbaf[current_lba_format];
+
+    ns->block_size    = 1U << fmt->lbads;
+    ns->metadata_size = fmt->ms;
+
+    if (ns->block_size > NVME_PAGE_SIZE) {
+        /* If we see devices that trigger this path, we need to increase our
+           buffer size. */
+        warn_internalerror();
+        goto free_buffer;
+    }
+
+    ns->drive.cntl_id   = ns - ctrl->ns;
+    ns->drive.removable = 0;
+    ns->drive.type      = DTYPE_NVME;
+    ns->drive.blksize   = ns->block_size;
+    ns->drive.sectors   = ns->lba_count;
+
+    ns->dma_buffer = zalloc_page_aligned(&ZoneHigh, NVME_PAGE_SIZE);
+
+    char *desc = znprintf(MAXDESCSIZE, "NVMe NS %u: %llu MiB (%llu %u-byte "
+                          "blocks + %u-byte metadata)\n",
+                          ns_id, (ns->lba_count * ns->block_size) >> 20,
+                          ns->lba_count, ns->block_size, ns->metadata_size);
+
+    dprintf(3, "%s", desc);
+    boot_add_hd(&ns->drive, desc, bootprio_find_pci_device(ctrl->pci));
+
+ free_buffer:
+    free (id);
+ }
+
+/* Returns 0 on success. */
+static int
+nvme_create_io_cq(struct nvme_ctrl *ctrl, struct nvme_cq *cq, u16 q_idx)
+{
+    struct nvme_sqe *cmd_create_cq;
+
+    nvme_init_cq(ctrl, cq, q_idx, NVME_PAGE_SIZE / sizeof(struct nvme_cqe));
+    cmd_create_cq = nvme_get_next_sqe(&ctrl->admin_sq,
+                                      NVME_SQE_OPC_ADMIN_CREATE_IO_CQ, NULL,
+                                      cq->cqe);
+    if (!cmd_create_cq) {
+        return -1;
+    }
+
+    cmd_create_cq->dword[10] = (cq->common.mask << 16) | (q_idx >> 1);
+    cmd_create_cq->dword[11] = 1 /* physically contiguous */;
+
+    nvme_commit_sqe(&ctrl->admin_sq);
+
+    struct nvme_cqe cqe = nvme_wait(&ctrl->admin_sq);
+
+    if (!nvme_is_cqe_success(&cqe)) {
+        dprintf(2, "create io cq failed: %08x %08x %08x %08x\n",
+                cqe.dword[0], cqe.dword[1], cqe.dword[2], cqe.dword[3]);
+
+        return -1;
+    }
+
+    return 0;
+}
+
+/* Returns 0 on success. */
+static int
+nvme_create_io_sq(struct nvme_ctrl *ctrl, struct nvme_sq *sq, u16 q_idx, struct nvme_cq *cq)
+{
+    struct nvme_sqe *cmd_create_sq;
+
+    nvme_init_sq(ctrl, sq, q_idx, NVME_PAGE_SIZE / sizeof(struct nvme_cqe), cq);
+    cmd_create_sq = nvme_get_next_sqe(&ctrl->admin_sq,
+                                      NVME_SQE_OPC_ADMIN_CREATE_IO_SQ, NULL,
+                                      sq->sqe);
+    if (!cmd_create_sq) {
+        return -1;
+    }
+
+    cmd_create_sq->dword[10] = (sq->common.mask << 16) | (q_idx >> 1);
+    cmd_create_sq->dword[11] = (q_idx >> 1) << 16 | 1 /* contiguous */;
+    dprintf(3, "sq %p create dword10 %08x dword11 %08x\n", sq,
+            cmd_create_sq->dword[10], cmd_create_sq->dword[11]);
+
+    nvme_commit_sqe(&ctrl->admin_sq);
+
+    struct nvme_cqe cqe = nvme_wait(&ctrl->admin_sq);
+
+    if (!nvme_is_cqe_success(&cqe)) {
+        dprintf(2, "create io sq failed: %08x %08x %08x %08x\n",
+                cqe.dword[0], cqe.dword[1], cqe.dword[2], cqe.dword[3]);
+        return -1;
+    }
+
+    return 0;
+}
+
+/* Reads count sectors into buf. Returns DISK_RET_*. The buffer cannot cross
+   page boundaries. */
+static int
+nvme_io_readwrite(struct nvme_namespace *ns, u64 lba, char *buf, u16 count,
+                  int write)
+{
+    u32 buf_addr = (u32)buf;
+
+    if ((buf_addr & 0x3) ||
+        ((buf_addr & ~(NVME_PAGE_SIZE - 1)) !=
+         ((buf_addr + ns->block_size * count - 1) & ~(NVME_PAGE_SIZE - 1)))) {
+        /* Buffer is misaligned or crosses page boundary */
+        warn_internalerror();
+        return DISK_RET_EBADTRACK;
+    }
+
+    struct nvme_sqe *io_read = nvme_get_next_sqe(&ns->ctrl->io_sq,
+                                                 write ? NVME_SQE_OPC_IO_WRITE
+                                                       : NVME_SQE_OPC_IO_READ,
+                                                 NULL, buf);
+    io_read->nsid = ns->ns_id;
+    io_read->dword[10] = (u32)lba;
+    io_read->dword[11] = (u32)(lba >> 32);
+    io_read->dword[12] = (1U << 31 /* limited retry */) | (count - 1);
+
+    nvme_commit_sqe(&ns->ctrl->io_sq);
+
+    struct nvme_cqe cqe = nvme_wait(&ns->ctrl->io_sq);
+
+    if (!nvme_is_cqe_success(&cqe)) {
+        dprintf(2, "read io: %08x %08x %08x %08x\n",
+                cqe.dword[0], cqe.dword[1], cqe.dword[2], cqe.dword[3]);
+
+        return DISK_RET_EBADTRACK;
+    }
+
+    return DISK_RET_SUCCESS;
+}
+
+
+static int
+nvme_create_io_queues(struct nvme_ctrl *ctrl)
+{
+    if (nvme_create_io_cq(ctrl, &ctrl->io_cq, 3))
+        return -1;
+
+    if (nvme_create_io_sq(ctrl, &ctrl->io_sq, 2, &ctrl->io_cq))
+        return -1;
+
+    return 0;
+}
+
+/* Waits for CSTS.RDY to match rdy. Returns 0 on success. */
+static int
+nvme_wait_csts_rdy(struct nvme_ctrl *ctrl, unsigned rdy)
+{
+    u32 const max_to = 500 /* ms */ * ((ctrl->reg->cap >> 24) & 0xFFU);
+    u32 to = timer_calc(max_to);
+    u32 csts;
+
+    while (rdy != ((csts = ctrl->reg->csts) & NVME_CSTS_RDY)) {
+        yield();
+
+        if (csts & NVME_CSTS_FATAL) {
+            dprintf(3, "NVMe fatal error during controller shutdown\n");
+            return -1;
+        }
+
+        if (timer_check(to)) {
+            warn_timeout();
+            return -1;
+        }
+    }
+
+    return 0;
+}
+
+/* Returns 0 on success. */
+static int
+nvme_controller_enable(struct nvme_ctrl *ctrl)
+{
+    pci_enable_busmaster(ctrl->pci);
+
+    /* Turn the controller off. */
+    ctrl->reg->cc = 0;
+    if (nvme_wait_csts_rdy(ctrl, 0)) {
+        dprintf(2, "NVMe fatal error during controller shutdown\n");
+        return -1;
+    }
+
+    ctrl->doorbell_stride = 4U << ((ctrl->reg->cap >> 32) & 0xF);
+
+    nvme_init_cq(ctrl, &ctrl->admin_cq, 1,
+                 NVME_PAGE_SIZE / sizeof(struct nvme_cqe));
+
+    nvme_init_sq(ctrl, &ctrl->admin_sq, 0,
+                 NVME_PAGE_SIZE / sizeof(struct nvme_sqe), &ctrl->admin_cq);
+
+    ctrl->reg->aqa = ctrl->admin_cq.common.mask << 16
+        | ctrl->admin_sq.common.mask;
+
+    /* Create the admin queue pair */
+    if (!ctrl->admin_sq.sqe || !ctrl->admin_cq.cqe) goto out_of_memory;
+
+    ctrl->reg->asq = (u32)ctrl->admin_sq.sqe;
+    ctrl->reg->acq = (u32)ctrl->admin_cq.cqe;
+
+    dprintf(3, "  admin submission queue: %p\n", ctrl->admin_sq.sqe);
+    dprintf(3, "  admin completion queue: %p\n", ctrl->admin_cq.cqe);
+
+    ctrl->reg->cc = NVME_CC_EN | (NVME_CQE_SIZE_LOG << 20)
+        | (NVME_SQE_SIZE_LOG << 16 /* IOSQES */);
+
+    if (nvme_wait_csts_rdy(ctrl, 1)) {
+        dprintf(2, "NVMe fatal error while enabling controller\n");
+        goto failed;
+    }
+    /* The admin queue is set up and the controller is ready. Let's figure out
+       what namespaces we have. */
+
+    struct nvme_identify_ctrl *identify = nvme_admin_identify_ctrl(ctrl);
+
+    if (!identify) {
+        dprintf(2, "NVMe couldn't identify controller.\n");
+        goto failed;
+    }
+
+    /* TODO Print model/serial info. */
+    dprintf(3, "NVMe has %u namespace%s.\n",
+            identify->nn, (identify->nn == 1) ? "" : "s");
+
+    ctrl->ns_count = identify->nn;
+    free(identify);
+
+    if ((ctrl->ns_count == 0) || nvme_create_io_queues(ctrl)) {
+        /* No point to continue, if the controller says it doesn't have
+           namespaces or we couldn't create I/O queues. */
+        goto failed;
+    }
+
+    ctrl->ns = malloc_fseg(sizeof(*ctrl->ns) * ctrl->ns_count);
+    if (!ctrl->ns) goto out_of_memory;
+    memset(ctrl->ns, 0, sizeof(*ctrl->ns) * ctrl->ns_count);
+
+    struct nvme_identify_ns_list *ns_list = nvme_admin_identify_get_ns_list(ctrl);
+    if (!ns_list) {
+        dprintf(2, "NVMe couldn't get namespace list.\n");
+        goto failed;
+    }
+
+    /* Populate namespace IDs */
+    int ns_idx;
+    for (ns_idx = 0;
+         ns_idx < ARRAY_SIZE(ns_list->ns_id)
+             && ns_idx < ctrl->ns_count
+             && ns_list->ns_id[ns_idx];
+         ns_idx++) {
+        nvme_probe_ns(ctrl, &ctrl->ns[ns_idx], ns_list->ns_id[ns_idx]);
+    }
+
+    free(ns_list);
+
+    /* If for some reason the namespace list gives us fewer namespaces, we just
+       go along. */
+    if (ns_idx != ctrl->ns_count) {
+        dprintf(2, "NVMe namespace list has only %u namespaces?\n", ns_idx);
+        ctrl->ns_count = ns_idx;
+    }
+
+    dprintf(3, "NVMe initialization complete!\n");
+    return 0;
+
+ out_of_memory:
+    warn_noalloc();
+ failed:
+    free(ctrl->admin_sq.sqe);
+    free(ctrl->admin_cq.cqe);
+    free(ctrl->ns);
+    return -1;
+}
+
+/* Initialize an NVMe controller and detect its drives. */
+static void
+nvme_controller_setup(void *opaque)
+{
+    struct pci_device *pci = opaque;
+
+    struct nvme_reg volatile *reg = pci_enable_membar(pci, PCI_BASE_ADDRESS_0);
+    if (!reg)
+        return;
+
+    u32 version = reg->vs;
+    dprintf(3, "Found NVMe controller with version %u.%u.%u.\n",
+            version >> 16, (version >> 8) & 0xFF, version & 0xFF);
+    dprintf(3, "  Capabilities %016llx\n", reg->cap);
+
+    if (version < 0x00010100U) {
+        dprintf(3, "Need at least 1.1.0! Skipping.\n");
+        return;
+    }
+
+    if (~reg->cap & NVME_CAP_CSS_NVME) {
+        dprintf(3, "Controller doesn't speak NVMe command set. Skipping.\n");
+        return;
+    }
+
+    struct nvme_ctrl *ctrl = malloc_high(sizeof(*ctrl));
+    if (!ctrl) {
+        warn_noalloc();
+        return;
+    }
+
+    memset(ctrl, 0, sizeof(*ctrl));
+
+    ctrl->reg = reg;
+    ctrl->pci = pci;
+
+    if (nvme_controller_enable(ctrl)) {
+        /* Initialization failed */
+        free(ctrl);
+    }
+}
+
+// Locate and init NVMe controllers
+static void
+nvme_scan(void)
+{
+    // Scan PCI bus for ATA adapters
+    struct pci_device *pci;
+
+    foreachpci(pci) {
+        if (pci->class != PCI_CLASS_STORAGE_NVME)
+            continue;
+        if (pci->prog_if != 2 /* as of NVM 1.0e */) {
+            dprintf(3, "Found incompatble NVMe: prog-if=%02x\n", pci->prog_if);
+            continue;
+        }
+
+        run_thread(nvme_controller_setup, pci);
+    }
+}
+
+static int
+nvme_cmd_readwrite(struct nvme_namespace *ns, struct disk_op_s *op, int write)
+{
+    int res = DISK_RET_SUCCESS;
+    u16 const max_blocks = NVME_PAGE_SIZE / ns->block_size;
+    u16 i;
+
+    for (i = 0; i < op->count || res != DISK_RET_SUCCESS;) {
+        u16 blocks_remaining = op->count - i;
+        u16 blocks = blocks_remaining < max_blocks ? blocks_remaining
+                                                   : max_blocks;
+        char *op_buf = op->buf_fl + i * ns->block_size;
+
+        if (write) {
+            memcpy(ns->dma_buffer, op_buf, blocks * ns->block_size);
+        }
+
+        res = nvme_io_readwrite(ns, op->lba + i, ns->dma_buffer, blocks, write);
+        dprintf(3, "ns %u %s lba %llu+%u: %d\n", ns->ns_id, write ? "write"
+                                                                  : "read",
+                op->lba + i, blocks, res);
+
+        if (!write && res == DISK_RET_SUCCESS) {
+            memcpy(op_buf, ns->dma_buffer, blocks * ns->block_size);
+        }
+
+        i += blocks;
+    }
+
+    return res;
+}
+
+int
+nvme_process_op(struct disk_op_s *op)
+{
+    if (!CONFIG_NVME || !runningOnQEMU())
+        return DISK_RET_SUCCESS;
+
+    struct nvme_namespace *ns = container_of(op->drive_gf, struct nvme_namespace,
+                                             drive);
+
+    switch (op->command) {
+    case CMD_READ:
+    case CMD_WRITE:
+        return nvme_cmd_readwrite(ns, op, op->command == CMD_WRITE);
+    default:
+        return default_process_op(op);
+    }
+}
+
+void
+nvme_setup(void)
+{
+    ASSERT32FLAT();
+    if (!CONFIG_NVME || !runningOnQEMU())
+        return;
+
+    dprintf(3, "init nvme\n");
+    nvme_scan();
+}
+
+/* EOF */