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diff --git a/usr.sbin/bhyve/Makefile b/usr.sbin/bhyve/Makefile
--- a/usr.sbin/bhyve/Makefile
+++ b/usr.sbin/bhyve/Makefile
@@ -15,6 +15,7 @@
BHYVE_SYSDIR?=${SRCTOP}
SRCS= \
+ acpi_device.c \
atkbdc.c \
acpi.c \
audio.c \
@@ -61,6 +62,7 @@
post.c \
ps2kbd.c \
ps2mouse.c \
+ qemu_fwcfg.c \
rfb.c \
rtc.c \
smbiostbl.c \
diff --git a/usr.sbin/bhyve/acpi.h b/usr.sbin/bhyve/acpi.h
--- a/usr.sbin/bhyve/acpi.h
+++ b/usr.sbin/bhyve/acpi.h
@@ -31,6 +31,8 @@
#ifndef _ACPI_H_
#define _ACPI_H_
+#include "acpi_device.h"
+
#define SCI_INT 9
#define SMI_CMD 0xb2
@@ -55,6 +57,7 @@
int acpi_build(struct vmctx *ctx, int ncpu);
void acpi_raise_gpe(struct vmctx *ctx, unsigned bit);
+int acpi_tables_add_device(const struct acpi_device *const dev);
void dsdt_line(const char *fmt, ...);
void dsdt_fixed_ioport(uint16_t iobase, uint16_t length);
void dsdt_fixed_irq(uint8_t irq);
diff --git a/usr.sbin/bhyve/acpi.c b/usr.sbin/bhyve/acpi.c
--- a/usr.sbin/bhyve/acpi.c
+++ b/usr.sbin/bhyve/acpi.c
@@ -139,6 +139,30 @@
#define EFFLUSH(x) \
if (fflush(x) != 0) goto err_exit;
+/*
+ * A list for additional ACPI devices like a TPM.
+ */
+struct acpi_device_list_entry {
+ SLIST_ENTRY(acpi_device_list_entry) chain;
+ const struct acpi_device *dev;
+};
+SLIST_HEAD(acpi_device_list,
+ acpi_device_list_entry) acpi_devices = SLIST_HEAD_INITIALIZER(acpi_devices);
+
+int
+acpi_tables_add_device(const struct acpi_device *const dev)
+{
+ struct acpi_device_list_entry *const entry = calloc(1, sizeof(*entry));
+ if (entry == NULL) {
+ return (ENOMEM);
+ }
+
+ entry->dev = dev;
+ SLIST_INSERT_HEAD(&acpi_devices, entry, chain);
+
+ return (0);
+}
+
static int
basl_fwrite_rsdp(FILE *fp)
{
@@ -760,6 +784,11 @@
vmgenc_write_dsdt();
+ const struct acpi_device_list_entry *entry;
+ SLIST_FOREACH(entry, &acpi_devices, chain) {
+ acpi_device_write_dsdt(entry->dev);
+ }
+
dsdt_line("}");
if (dsdt_error != 0)
diff --git a/usr.sbin/bhyve/acpi_device.h b/usr.sbin/bhyve/acpi_device.h
new file mode 100644
--- /dev/null
+++ b/usr.sbin/bhyve/acpi_device.h
@@ -0,0 +1,42 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Beckhoff Automation GmbH & Co. KG
+ * Author: Corvin Köhne <c.koehne@beckhoff.com>
+ */
+
+#pragma once
+
+#include <contrib/dev/acpica/include/acpi.h>
+
+struct vmctx;
+
+struct acpi_device;
+
+/**
+ * Creates an ACPI device.
+ *
+ * @param[out] new_dev Returns the newly create ACPI device.
+ * @param[in] vm_ctx VM context the ACPI device is created in.
+ * @param[in] name Name of the ACPI device. Should always be a NULL
+ * terminated string.
+ * @param[in] hid Hardware ID of the ACPI device. Should always be a NULL
+ * terminated string.
+ */
+int acpi_device_create(struct acpi_device **const new_dev,
+ struct vmctx *const vm_ctx, const char *const name, const char *const hid);
+void acpi_device_destroy(struct acpi_device *const dev);
+
+/**
+ * @note: acpi_device_add_res_acpi_buffer doesn't ensure that no resources are
+ * added on an error condition. On error the caller should assume that
+ * the ACPI_BUFFER is partially added to the ACPI device.
+ */
+int acpi_device_add_res_acpi_buffer(struct acpi_device *const dev,
+ const ACPI_BUFFER resources);
+int acpi_device_add_res_fixed_ioport(struct acpi_device *const dev,
+ const UINT16 port, UINT8 length);
+int acpi_device_add_res_fixed_memory32(struct acpi_device *const dev,
+ const UINT8 write_protected, const UINT32 address, const UINT32 length);
+
+void acpi_device_write_dsdt(const struct acpi_device *const dev);
diff --git a/usr.sbin/bhyve/acpi_device.c b/usr.sbin/bhyve/acpi_device.c
new file mode 100644
--- /dev/null
+++ b/usr.sbin/bhyve/acpi_device.c
@@ -0,0 +1,240 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Beckhoff Automation GmbH & Co. KG
+ * Author: Corvin Köhne <c.koehne@beckhoff.com>
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/queue.h>
+
+#include <machine/vmm.h>
+
+#include <err.h>
+#include <errno.h>
+#include <vmmapi.h>
+
+#include "acpi.h"
+#include "acpi_device.h"
+
+/**
+ * List entry to enumerate all resources used by an ACPI device.
+ *
+ * @param chain Used to chain multiple elements together.
+ * @param type Type of the ACPI resource.
+ * @param data Data of the ACPI resource.
+ */
+struct acpi_resource_list_entry {
+ SLIST_ENTRY(acpi_resource_list_entry) chain;
+ UINT32 type;
+ ACPI_RESOURCE_DATA data;
+};
+
+/**
+ * Holds information about an ACPI device.
+ *
+ * @param vm_ctx VM context the ACPI device was created in.
+ * @param name Name of the ACPI device.
+ * @param hid Hardware ID of the ACPI device.
+ * @param crs Current resources used by the ACPI device.
+ */
+struct acpi_device {
+ struct vmctx *vm_ctx;
+ const char *name;
+ const char *hid;
+ SLIST_HEAD(acpi_resource_list, acpi_resource_list_entry) crs;
+};
+
+int
+acpi_device_create(struct acpi_device **const new_dev,
+ struct vmctx *const vm_ctx, const char *const name, const char *const hid)
+{
+ if (new_dev == NULL || vm_ctx == NULL || name == NULL || hid == NULL) {
+ return (EINVAL);
+ }
+
+ struct acpi_device *const dev = calloc(1, sizeof(*dev));
+ if (dev == NULL) {
+ return (ENOMEM);
+ }
+
+ dev->vm_ctx = vm_ctx;
+ dev->name = name;
+ dev->hid = hid;
+ SLIST_INIT(&dev->crs);
+
+ /* current resources always contain an end tag */
+ struct acpi_resource_list_entry *const crs_end_tag = calloc(1,
+ sizeof(*crs_end_tag));
+ if (crs_end_tag == NULL) {
+ acpi_device_destroy(dev);
+ return (ENOMEM);
+ }
+ crs_end_tag->type = ACPI_RESOURCE_TYPE_END_TAG;
+ SLIST_INSERT_HEAD(&dev->crs, crs_end_tag, chain);
+
+ const int error = acpi_tables_add_device(dev);
+ if (error) {
+ acpi_device_destroy(dev);
+ return (error);
+ }
+
+ *new_dev = dev;
+
+ return (0);
+}
+
+void
+acpi_device_destroy(struct acpi_device *const dev)
+{
+ if (dev == NULL) {
+ return;
+ }
+
+ struct acpi_resource_list_entry *res;
+ while (!SLIST_EMPTY(&dev->crs)) {
+ res = SLIST_FIRST(&dev->crs);
+ SLIST_REMOVE_HEAD(&dev->crs, chain);
+ free(res);
+ }
+}
+
+int
+acpi_device_add_res_acpi_buffer(struct acpi_device *const dev,
+ const ACPI_BUFFER resources)
+{
+ if (dev == NULL) {
+ return (EINVAL);
+ }
+
+ int error = 0;
+ size_t offset = 0;
+ while (offset < resources.Length) {
+ const ACPI_RESOURCE *const res =
+ (const ACPI_RESOURCE *)((UINT8 *)resources.Pointer +
+ offset);
+ switch (res->Type) {
+ case ACPI_RESOURCE_TYPE_FIXED_IO:
+ error = acpi_device_add_res_fixed_ioport(dev,
+ res->Data.FixedIo.Address,
+ res->Data.FixedIo.AddressLength);
+ break;
+ case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
+ error = acpi_device_add_res_fixed_memory32(dev,
+ res->Data.FixedMemory32.WriteProtect,
+ res->Data.FixedMemory32.Address,
+ res->Data.FixedMemory32.AddressLength);
+ break;
+ case ACPI_RESOURCE_TYPE_END_TAG:
+ break;
+ default:
+ warnx("%s: unknown resource type %d", __func__,
+ res->Type);
+ return (ENODEV);
+ }
+ if (error) {
+ break;
+ }
+ offset += res->Length;
+ }
+
+ return (error);
+}
+
+int
+acpi_device_add_res_fixed_ioport(struct acpi_device *const dev,
+ const UINT16 port, const UINT8 length)
+{
+ if (dev == NULL) {
+ return (EINVAL);
+ }
+
+ struct acpi_resource_list_entry *const res = calloc(1, sizeof(*res));
+ if (res == NULL) {
+ return (ENOMEM);
+ }
+
+ res->type = ACPI_RESOURCE_TYPE_FIXED_IO;
+ res->data.FixedIo.Address = port;
+ res->data.FixedIo.AddressLength = length;
+
+ SLIST_INSERT_HEAD(&dev->crs, res, chain);
+
+ return (0);
+}
+
+int
+acpi_device_add_res_fixed_memory32(struct acpi_device *const dev,
+ const UINT8 write_protected, const UINT32 address, const UINT32 length)
+{
+ if (dev == NULL) {
+ return (EINVAL);
+ }
+
+ struct acpi_resource_list_entry *const res = calloc(1, sizeof(*res));
+ if (res == NULL) {
+ return (ENOMEM);
+ }
+
+ res->type = ACPI_RESOURCE_TYPE_FIXED_MEMORY32;
+ res->data.FixedMemory32.WriteProtect = write_protected;
+ res->data.FixedMemory32.Address = address;
+ res->data.FixedMemory32.AddressLength = length;
+
+ SLIST_INSERT_HEAD(&dev->crs, res, chain);
+
+ return (0);
+}
+
+static void
+acpi_device_write_dsdt_crs(const struct acpi_device *const dev)
+{
+ const struct acpi_resource_list_entry *res;
+ SLIST_FOREACH (res, &dev->crs, chain) {
+ switch (res->type) {
+ case ACPI_RESOURCE_TYPE_FIXED_IO:
+ dsdt_fixed_ioport(res->data.FixedIo.Address,
+ res->data.FixedIo.AddressLength);
+ break;
+ case ACPI_RESOURCE_TYPE_FIXED_MEMORY32: {
+ dsdt_fixed_mem32(res->data.FixedMemory32.Address,
+ res->data.FixedMemory32.AddressLength);
+ break;
+ }
+ case ACPI_RESOURCE_TYPE_END_TAG:
+ break;
+ default:
+ warnx("%s: unknown resource type %d", __func__,
+ res->type);
+ return;
+ }
+ }
+}
+
+void
+acpi_device_write_dsdt(const struct acpi_device *const dev)
+{
+ if (dev == NULL) {
+ return;
+ }
+
+ dsdt_line("");
+ dsdt_line(" Scope (\\_SB)");
+ dsdt_line(" {");
+ dsdt_line(" Device (%s)", dev->name);
+ dsdt_line(" {");
+ dsdt_line(" Name (_HID, \"%s\")", dev->hid);
+ dsdt_line(" Name (_STA, 0x0F)");
+ dsdt_line(" Name (_CRS, ResourceTemplate ()");
+ dsdt_line(" {");
+ dsdt_indent(4);
+ acpi_device_write_dsdt_crs(dev);
+ dsdt_unindent(4);
+ dsdt_line(" })");
+ dsdt_line(" }");
+ dsdt_line(" }");
+}
diff --git a/usr.sbin/bhyve/bhyverun.c b/usr.sbin/bhyve/bhyverun.c
--- a/usr.sbin/bhyve/bhyverun.c
+++ b/usr.sbin/bhyve/bhyverun.c
@@ -100,6 +100,7 @@
#include "pci_emul.h"
#include "pci_irq.h"
#include "pci_lpc.h"
+#include "qemu_fwcfg.h"
#include "smbiostbl.h"
#ifdef BHYVE_SNAPSHOT
#include "snapshot.h"
@@ -1452,6 +1453,52 @@
rtc_init(ctx);
sci_init(ctx);
+ const char *fwcfg = lpc_fwcfg();
+ if (lpc_bootrom()) {
+ if (fwcfg == NULL || strcmp(fwcfg, "bhyve") == 0) {
+ fwctl_init();
+ } else if (strcmp(fwcfg, "qemu") == 0) {
+ if (qemu_fwcfg_init(ctx) != 0) {
+ fprintf(stderr,
+ "qemu fwcfg initialization error");
+ exit(4);
+ }
+ /*
+ * QEMU uses fwcfg item 0x0f (FW_CFG_MAX_CPUS) to report
+ * the number of cpus to the guest but states that it
+ * has a special meaning for x86. Don't know yet if that
+ * can cause unintented side-effects. Use an own fwcfg
+ * item to be safe.
+ *
+ * QEMU comment:
+ * FW_CFG_MAX_CPUS is a bit confusing/problematic
+ * on x86:
+ *
+ * For machine types prior to 1.8, SeaBIOS needs
+ * FW_CFG_MAX_CPUS for building MPTable, ACPI MADT,
+ * ACPI CPU hotplug and ACPI SRAT table, that
+ * tables are based on xAPIC ID and QEMU<->SeaBIOS
+ * interface for CPU hotplug also uses APIC ID and
+ * not "CPU index". This means that FW_CFG_MAX_CPUS
+ * is not the "maximum number of CPUs", but the
+ * "limit to the APIC ID values SeaBIOS may see".
+ *
+ * So for compatibility reasons with old BIOSes we
+ * are stuck with "etc/max-cpus" actually being
+ * apic_id_limit
+ */
+ if (qemu_fwcfg_add_file("opt/bhyve/hw.ncpu",
+ sizeof(guest_ncpus), &guest_ncpus) != 0) {
+ fprintf(stderr,
+ "Could not add qemu fwcfg opt/bhyve/hw.ncpu");
+ exit(4);
+ }
+ } else {
+ fprintf(stderr, "Invalid fwcfg %s", fwcfg);
+ exit(4);
+ }
+ }
+
/*
* Exit if a device emulation finds an error in its initilization
*/
@@ -1535,9 +1582,6 @@
assert(error == 0);
}
- if (lpc_bootrom())
- fwctl_init();
-
/*
* Change the proc title to include the VM name.
*/
diff --git a/usr.sbin/bhyve/pci_lpc.h b/usr.sbin/bhyve/pci_lpc.h
--- a/usr.sbin/bhyve/pci_lpc.h
+++ b/usr.sbin/bhyve/pci_lpc.h
@@ -72,5 +72,6 @@
char *lpc_pirq_name(int pin);
void lpc_pirq_routed(void);
const char *lpc_bootrom(void);
+const char *lpc_fwcfg(void);
#endif
diff --git a/usr.sbin/bhyve/pci_lpc.c b/usr.sbin/bhyve/pci_lpc.c
--- a/usr.sbin/bhyve/pci_lpc.c
+++ b/usr.sbin/bhyve/pci_lpc.c
@@ -101,7 +101,13 @@
lpcdev = strsep(&str, ",");
if (lpcdev != NULL) {
if (strcasecmp(lpcdev, "bootrom") == 0) {
- set_config_value("lpc.bootrom", str);
+ nvlist_t *const nvl = create_config_node("lpc.bootrom");
+ /* use qemu as default fwcfg */
+ set_config_value_node(nvl, "fwcfg", "qemu");
+
+ const char *const code = strsep(&str, ",");
+ set_config_value_node(nvl, "code", code);
+ pci_parse_legacy_config(nvl, str);
error = 0;
goto done;
}
@@ -145,7 +151,13 @@
lpc_bootrom(void)
{
- return (get_config_value("lpc.bootrom"));
+ return (get_config_value("lpc.bootrom.code"));
+}
+
+const char *
+lpc_fwcfg(void)
+{
+ return (get_config_value("lpc.bootrom.fwcfg"));
}
static void
@@ -208,7 +220,7 @@
char *node_name;
int unit, error;
- romfile = get_config_value("lpc.bootrom");
+ romfile = get_config_value("lpc.bootrom.code");
if (romfile != NULL) {
error = bootrom_loadrom(ctx, romfile);
if (error)
diff --git a/usr.sbin/bhyve/qemu_fwcfg.h b/usr.sbin/bhyve/qemu_fwcfg.h
new file mode 100644
--- /dev/null
+++ b/usr.sbin/bhyve/qemu_fwcfg.h
@@ -0,0 +1,23 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Beckhoff Automation GmbH & Co. KG
+ * Author: Corvin Köhne <c.koehne@beckhoff.com>
+ */
+
+#pragma once
+
+#include <vmmapi.h>
+
+#define QEMU_FWCFG_MAX_ARCHS 0x2
+#define QEMU_FWCFG_MAX_ENTRIES 0x3FFF
+#define QEMU_FWCFG_MAX_NAME 56
+
+struct qemu_fwcfg_item {
+ uint32_t size;
+ uint8_t *data;
+};
+
+int qemu_fwcfg_add_file(const uint8_t name[QEMU_FWCFG_MAX_NAME],
+ const uint32_t size, void *const data);
+int qemu_fwcfg_init(struct vmctx *const ctx);
diff --git a/usr.sbin/bhyve/qemu_fwcfg.c b/usr.sbin/bhyve/qemu_fwcfg.c
new file mode 100644
--- /dev/null
+++ b/usr.sbin/bhyve/qemu_fwcfg.c
@@ -0,0 +1,411 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Beckhoff Automation GmbH & Co. KG
+ * Author: Corvin Köhne <c.koehne@beckhoff.com>
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/endian.h>
+
+#include <machine/vmm.h>
+
+#include <err.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "acpi_device.h"
+#include "inout.h"
+#include "qemu_fwcfg.h"
+
+#define QEMU_FWCFG_ACPI_DEVICE_NAME "FWCF"
+#define QEMU_FWCFG_ACPI_HARDWARE_ID "QEMU0002"
+
+#define QEMU_FWCFG_SELECTOR_PORT_NUMBER 0x510
+#define QEMU_FWCFG_SELECTOR_PORT_SIZE 1
+#define QEMU_FWCFG_SELECTOR_PORT_FLAGS IOPORT_F_INOUT
+#define QEMU_FWCFG_DATA_PORT_NUMBER 0x511
+#define QEMU_FWCFG_DATA_PORT_SIZE 1
+#define QEMU_FWCFG_DATA_PORT_FLAGS \
+ IOPORT_F_INOUT /* QEMU v2.4+ ignores writes */
+
+#define QEMU_FWCFG_ARCHITECTURE_MASK 0x0001
+#define QEMU_FWCFG_INDEX_MASK 0x3FFF
+
+#define QEMU_FWCFG_SELECT_READ 0
+#define QEMU_FWCFG_SELECT_WRITE 1
+
+#define QEMU_FWCFG_ARCHITECTURE_GENERIC 0
+#define QEMU_FWCFG_ARCHITECTURE_SPECIFIC 1
+
+#define QEMU_FWCFG_INDEX_SIGNATURE 0x00
+#define QEMU_FWCFG_INDEX_ID 0x01
+#define QEMU_FWCFG_INDEX_FILE_DIR 0x19
+
+#define QEMU_FWCFG_FIRST_FILE_INDEX 0x20
+
+#define QEMU_FWCFG_MIN_FILES 10
+
+#pragma pack(1)
+
+union qemu_fwcfg_selector {
+ struct {
+ uint16_t index : 14;
+ uint16_t writeable : 1;
+ /*
+ * 0 = generic | for all architectures
+ * 1 = specific | only for current architecture
+ */
+ uint16_t architecture : 1;
+ };
+ uint16_t bits;
+};
+
+struct qemu_fwcfg_signature {
+ uint8_t signature[4];
+};
+
+struct qemu_fwcfg_id {
+ uint32_t interface : 1; /* always set */
+ uint32_t DMA : 1;
+ uint32_t reserved : 30;
+};
+
+struct qemu_fwcfg_file {
+ uint32_t be_size;
+ uint16_t be_selector;
+ uint16_t reserved;
+ uint8_t name[QEMU_FWCFG_MAX_NAME];
+};
+
+struct qemu_fwcfg_directory {
+ uint32_t be_count;
+ struct qemu_fwcfg_file files[0];
+};
+
+struct qemu_fwcfg_softc {
+ struct acpi_device *acpi_dev;
+
+ uint32_t data_offset;
+ union qemu_fwcfg_selector selector;
+ struct qemu_fwcfg_item items[QEMU_FWCFG_MAX_ARCHS]
+ [QEMU_FWCFG_MAX_ENTRIES];
+ struct qemu_fwcfg_directory *directory;
+};
+
+#pragma pack()
+
+static struct qemu_fwcfg_softc sc;
+
+static int
+qemu_fwcfg_selector_port_handler(struct vmctx *const ctx, const int vcpu,
+ const int in, const int port, const int bytes, uint32_t *const eax,
+ void *const arg)
+{
+ if (in) {
+ *eax = *(uint16_t *)&sc.selector;
+ return (0);
+ }
+
+ sc.data_offset = 0;
+ sc.selector.bits = *eax;
+
+ return (0);
+}
+
+static int
+qemu_fwcfg_data_port_handler(struct vmctx *const ctx, const int vcpu,
+ const int in, const int port, const int bytes, uint32_t *const eax,
+ void *const arg)
+{
+ if (!in) {
+ warnx("%s: Writes to qemu fwcfg data port aren't allowed",
+ __func__);
+ return (-1);
+ }
+
+ /* get fwcfg item */
+ struct qemu_fwcfg_item *const item =
+ &sc.items[sc.selector.architecture][sc.selector.index];
+ if (item->data == NULL) {
+ warnx(
+ "%s: qemu fwcfg item doesn't exist (architecture %s index 0x%x)",
+ __func__, sc.selector.architecture ? "specific" : "generic",
+ sc.selector.index);
+ *eax = 0x00;
+ return (0);
+ } else if (sc.data_offset >= item->size) {
+ warnx(
+ "%s: qemu fwcfg item read exceeds size (architecture %s index 0x%x size 0x%x offset 0x%x)",
+ __func__, sc.selector.architecture ? "specific" : "generic",
+ sc.selector.index, item->size, sc.data_offset);
+ *eax = 0x00;
+ return (0);
+ }
+
+ /* return item data */
+ *eax = item->data[sc.data_offset];
+ sc.data_offset++;
+
+ return (0);
+}
+
+static int
+qemu_fwcfg_add_item(const uint16_t architecture, const uint16_t index,
+ const uint32_t size, void *const data)
+{
+ /* truncate architecture and index to their desired size */
+ const uint16_t arch = architecture & QEMU_FWCFG_ARCHITECTURE_MASK;
+ const uint16_t idx = index & QEMU_FWCFG_INDEX_MASK;
+
+ /* get pointer to item specified by selector */
+ struct qemu_fwcfg_item *const fwcfg_item = &sc.items[arch][idx];
+
+ /* check if item is already used */
+ if (fwcfg_item->data != NULL) {
+ warnx("%s: qemu fwcfg item exists (architecture %s index 0x%x)",
+ __func__, arch ? "specific" : "generic", idx);
+ return (-1);
+ }
+
+ /* save data of the item */
+ fwcfg_item->size = size;
+ fwcfg_item->data = data;
+
+ return (0);
+}
+
+static int
+qemu_fwcfg_add_item_file_dir()
+{
+ /* alloc directory */
+ const size_t size = sizeof(struct qemu_fwcfg_directory) +
+ QEMU_FWCFG_MIN_FILES * sizeof(struct qemu_fwcfg_file);
+ struct qemu_fwcfg_directory *const fwcfg_directory = calloc(1, size);
+ if (fwcfg_directory == NULL) {
+ return (-ENOMEM);
+ }
+
+ /* init directory */
+ sc.directory = fwcfg_directory;
+
+ /* add directory */
+ return qemu_fwcfg_add_item(QEMU_FWCFG_ARCHITECTURE_GENERIC,
+ QEMU_FWCFG_INDEX_FILE_DIR, sizeof(struct qemu_fwcfg_directory), (uint8_t *)sc.directory);
+}
+
+static int
+qemu_fwcfg_add_item_id()
+{
+ /* alloc id */
+ struct qemu_fwcfg_id *const fwcfg_id = calloc(1,
+ sizeof(struct qemu_fwcfg_id));
+ if (fwcfg_id == NULL) {
+ return (-ENOMEM);
+ }
+
+ /* init id */
+ fwcfg_id->interface = 1;
+ fwcfg_id->DMA = 0;
+
+ /*
+ * QEMU specifies ID as little endian.
+ * Convert fwcfg_id to little endian.
+ */
+ uint32_t *const le_fwcfg_id_ptr = (uint32_t *)fwcfg_id;
+ *le_fwcfg_id_ptr = htole32(*le_fwcfg_id_ptr);
+
+ /* add id */
+ return qemu_fwcfg_add_item(QEMU_FWCFG_ARCHITECTURE_GENERIC,
+ QEMU_FWCFG_INDEX_ID, sizeof(struct qemu_fwcfg_id),
+ (uint8_t *)fwcfg_id);
+}
+
+static int
+qemu_fwcfg_add_item_signature()
+{
+ /* alloc signature */
+ struct qemu_fwcfg_signature *const fwcfg_signature = calloc(1,
+ sizeof(struct qemu_fwcfg_signature));
+ if (fwcfg_signature == NULL) {
+ return (-ENOMEM);
+ }
+
+ /* init signature */
+ fwcfg_signature->signature[0] = 'Q';
+ fwcfg_signature->signature[1] = 'E';
+ fwcfg_signature->signature[2] = 'M';
+ fwcfg_signature->signature[3] = 'U';
+
+ /* add signature */
+ return qemu_fwcfg_add_item(QEMU_FWCFG_ARCHITECTURE_GENERIC,
+ QEMU_FWCFG_INDEX_SIGNATURE, sizeof(struct qemu_fwcfg_signature),
+ (uint8_t *)fwcfg_signature);
+}
+
+static int
+qemu_fwcfg_register_port(const char *const name, const int port, const int size,
+ const int flags, const inout_func_t handler)
+{
+ struct inout_port iop;
+
+ bzero(&iop, sizeof(iop));
+ iop.name = name;
+ iop.port = port;
+ iop.size = size;
+ iop.flags = flags;
+ iop.handler = handler;
+
+ return register_inout(&iop);
+}
+
+int
+qemu_fwcfg_add_file(const uint8_t name[QEMU_FWCFG_MAX_NAME], const uint32_t size,
+ void *const data)
+{
+ /*
+ * QEMU specifies count as big endian.
+ * Convert it to host endian to work with it.
+ */
+ const uint32_t count = be32toh(sc.directory->be_count) + 1;
+
+ /* add file to items list */
+ const uint32_t index = QEMU_FWCFG_FIRST_FILE_INDEX + count - 1;
+ const int error = qemu_fwcfg_add_item(QEMU_FWCFG_ARCHITECTURE_GENERIC,
+ index, size, data);
+ if (error != 0) {
+ return (error);
+ }
+
+ /*
+ * files should be sorted alphabetical, get index for new file
+ */
+ uint32_t file_index;
+ for (file_index = 0; file_index < count - 1; ++file_index) {
+ if (strcmp(name, sc.directory->files[file_index].name) < 0)
+ break;
+ }
+
+ if (count > QEMU_FWCFG_MIN_FILES) {
+ /* alloc new file directory */
+ const uint64_t new_size = sizeof(struct qemu_fwcfg_directory) +
+ count * sizeof(struct qemu_fwcfg_file);
+ struct qemu_fwcfg_directory *const new_directory = calloc(1,
+ new_size);
+ if (new_directory == NULL) {
+ warnx(
+ "%s: Unable to allocate a new qemu fwcfg files directory (count %d)",
+ __func__, count);
+ return (-ENOMEM);
+ }
+
+ /* copy files below file_index to new directory */
+ memcpy(new_directory->files, sc.directory->files,
+ file_index * sizeof(struct qemu_fwcfg_file));
+
+ /* copy files behind file_index to directory */
+ memcpy(&new_directory->files[file_index + 1],
+ &sc.directory->files[file_index],
+ (count - file_index) * sizeof(struct qemu_fwcfg_file));
+
+ /* free old directory */
+ free(sc.directory);
+
+ /* set directory pointer to new directory */
+ sc.directory = new_directory;
+
+ /* adjust directory pointer */
+ sc.items[0][QEMU_FWCFG_INDEX_FILE_DIR].data = (uint8_t *)
+ sc.directory;
+ } else {
+ /* shift files behind file_index */
+ for (uint32_t i = QEMU_FWCFG_MIN_FILES - 1; i > file_index; --i) {
+ memcpy(&sc.directory->files[i],
+ &sc.directory->files[i - 1],
+ sizeof(struct qemu_fwcfg_file));
+ }
+ }
+
+ /*
+ * QEMU specifies count, size and index as big endian.
+ * Save these values in big endian to simplify guest reads of these
+ * values.
+ */
+ sc.directory->be_count = htobe32(count);
+ sc.directory->files[file_index].be_size = htobe32(size);
+ sc.directory->files[file_index].be_selector = htobe16(index);
+ strcpy(sc.directory->files[file_index].name, name);
+
+ /* set new size for the fwcfg_file_directory */
+ sc.items[0][QEMU_FWCFG_INDEX_FILE_DIR].size =
+ sizeof(struct qemu_fwcfg_directory) +
+ count * sizeof(struct qemu_fwcfg_file);
+
+ return (0);
+}
+
+int
+qemu_fwcfg_init(struct vmctx *const ctx)
+{
+ int error;
+
+ error = acpi_device_create(&sc.acpi_dev, ctx,
+ QEMU_FWCFG_ACPI_DEVICE_NAME, QEMU_FWCFG_ACPI_HARDWARE_ID);
+ if (error) {
+ warnx("%s: failed to create ACPI device for QEMU FwCfg",
+ __func__);
+ goto done;
+ }
+
+ error = acpi_device_add_res_fixed_ioport(sc.acpi_dev,
+ QEMU_FWCFG_SELECTOR_PORT_NUMBER, 2);
+ if (error) {
+ warnx("%s: failed to add fixed IO port for QEMU FwCfg",
+ __func__);
+ goto done;
+ }
+
+ /* add common fwcfg items */
+ if ((error = qemu_fwcfg_add_item_signature()) != 0) {
+ warnx("%s: Unable to add signature item", __func__);
+ goto done;
+ }
+ if ((error = qemu_fwcfg_add_item_id()) != 0) {
+ warnx("%s: Unable to add id item", __func__);
+ goto done;
+ }
+ if ((error = qemu_fwcfg_add_item_file_dir()) != 0) {
+ warnx("%s: Unable to add file_dir item", __func__);
+ goto done;
+ }
+
+ /* add handlers for fwcfg ports */
+ if ((error = qemu_fwcfg_register_port("qemu_fwcfg_selector",
+ QEMU_FWCFG_SELECTOR_PORT_NUMBER, QEMU_FWCFG_SELECTOR_PORT_SIZE,
+ QEMU_FWCFG_SELECTOR_PORT_FLAGS,
+ qemu_fwcfg_selector_port_handler)) != 0) {
+ warnx("%s: Unable to register qemu fwcfg selector port 0x%x",
+ __func__, QEMU_FWCFG_SELECTOR_PORT_NUMBER);
+ goto done;
+ }
+ if ((error = qemu_fwcfg_register_port("qemu_fwcfg_data",
+ QEMU_FWCFG_DATA_PORT_NUMBER, QEMU_FWCFG_DATA_PORT_SIZE,
+ QEMU_FWCFG_DATA_PORT_FLAGS, qemu_fwcfg_data_port_handler)) !=
+ 0) {
+ warnx("%s: Unable to register qemu fwcfg data port 0x%x",
+ __func__, QEMU_FWCFG_DATA_PORT_NUMBER);
+ goto done;
+ }
+
+done:
+ if (error) {
+ acpi_device_destroy(sc.acpi_dev);
+ }
+
+ return (error);
+}

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