hw/arm/virt-acpi-build: Basic framework for building ACPI tables on ARM

Introduce a preliminary framework in virt-acpi-build.c with the main
ACPI build functions. It exposes the generated ACPI contents to
guest over fw_cfg.

The required ACPI v5.1 tables for ARM are:
- RSDP: Initial table that points to XSDT
- RSDT: Points to FADT GTDT MADT tables
- FADT: Generic information about the machine
- GTDT: Generic timer description table
- MADT: Multiple APIC description table
- DSDT: Holds all information about system devices/peripherals, pointed by FADT

Signed-off-by: Shannon Zhao <zhaoshenglong@huawei.com>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-id: 1432522520-8068-5-git-send-email-zhaoshenglong@huawei.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 183 insertions, 0 deletions

diff --git a/hw/arm/Makefile.objs b/hw/arm/Makefile.objs
index a75a182..4b09caf 100644
--- a/hw/arm/Makefile.objs
+++ b/hw/arm/Makefile.objs
@@ -3,6 +3,7 @@ obj-$(CONFIG_DIGIC) += digic_boards.o
 obj-y += integratorcp.o kzm.o mainstone.o musicpal.o nseries.o
 obj-y += omap_sx1.o palm.o realview.o spitz.o stellaris.o
 obj-y += tosa.o versatilepb.o vexpress.o virt.o xilinx_zynq.o z2.o
+obj-$(CONFIG_ACPI) += virt-acpi-build.o
 obj-y += netduino2.o
 
 obj-y += armv7m.o exynos4210.o pxa2xx.o pxa2xx_gpio.o pxa2xx_pic.o
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
new file mode 100644
index 0000000..b8a5bd8
--- /dev/null
+++ b/hw/arm/virt-acpi-build.c
@@ -0,0 +1,182 @@
+/* Support for generating ACPI tables and passing them to Guests
+ *
+ * ARM virt ACPI generation
+ *
+ * Copyright (C) 2008-2010  Kevin O'Connor <kevin@koconnor.net>
+ * Copyright (C) 2006 Fabrice Bellard
+ * Copyright (C) 2013 Red Hat Inc
+ *
+ * Author: Michael S. Tsirkin <mst@redhat.com>
+ *
+ * Copyright (c) 2015 HUAWEI TECHNOLOGIES CO.,LTD.
+ *
+ * Author: Shannon Zhao <zhaoshenglong@huawei.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu-common.h"
+#include "hw/arm/virt-acpi-build.h"
+#include "qemu/bitmap.h"
+#include "trace.h"
+#include "qom/cpu.h"
+#include "target-arm/cpu.h"
+#include "hw/acpi/acpi-defs.h"
+#include "hw/acpi/acpi.h"
+#include "hw/nvram/fw_cfg.h"
+#include "hw/acpi/bios-linker-loader.h"
+#include "hw/loader.h"
+#include "hw/hw.h"
+#include "hw/acpi/aml-build.h"
+
+typedef
+struct AcpiBuildState {
+    /* Copy of table in RAM (for patching). */
+    MemoryRegion *table_mr;
+    MemoryRegion *rsdp_mr;
+    MemoryRegion *linker_mr;
+    /* Is table patched? */
+    bool patched;
+    VirtGuestInfo *guest_info;
+} AcpiBuildState;
+
+static
+void virt_acpi_build(VirtGuestInfo *guest_info, AcpiBuildTables *tables)
+{
+    GArray *table_offsets;
+
+    table_offsets = g_array_new(false, true /* clear */,
+                                        sizeof(uint32_t));
+
+    bios_linker_loader_alloc(tables->linker, ACPI_BUILD_TABLE_FILE,
+                             64, false /* high memory */);
+
+    /*
+     * The ACPI v5.1 tables for Hardware-reduced ACPI platform are:
+     * RSDP
+     * RSDT
+     * FADT
+     * GTDT
+     * MADT
+     * DSDT
+     */
+
+    /* Cleanup memory that's no longer used. */
+    g_array_free(table_offsets, true);
+}
+
+static void acpi_ram_update(MemoryRegion *mr, GArray *data)
+{
+    uint32_t size = acpi_data_len(data);
+
+    /* Make sure RAM size is correct - in case it got changed
+     * e.g. by migration */
+    memory_region_ram_resize(mr, size, &error_abort);
+
+    memcpy(memory_region_get_ram_ptr(mr), data->data, size);
+    memory_region_set_dirty(mr, 0, size);
+}
+
+static void virt_acpi_build_update(void *build_opaque, uint32_t offset)
+{
+    AcpiBuildState *build_state = build_opaque;
+    AcpiBuildTables tables;
+
+    /* No state to update or already patched? Nothing to do. */
+    if (!build_state || build_state->patched) {
+        return;
+    }
+    build_state->patched = true;
+
+    acpi_build_tables_init(&tables);
+
+    virt_acpi_build(build_state->guest_info, &tables);
+
+    acpi_ram_update(build_state->table_mr, tables.table_data);
+    acpi_ram_update(build_state->rsdp_mr, tables.rsdp);
+    acpi_ram_update(build_state->linker_mr, tables.linker);
+
+
+    acpi_build_tables_cleanup(&tables, true);
+}
+
+static void virt_acpi_build_reset(void *build_opaque)
+{
+    AcpiBuildState *build_state = build_opaque;
+    build_state->patched = false;
+}
+
+static MemoryRegion *acpi_add_rom_blob(AcpiBuildState *build_state,
+                                       GArray *blob, const char *name,
+                                       uint64_t max_size)
+{
+    return rom_add_blob(name, blob->data, acpi_data_len(blob), max_size, -1,
+                        name, virt_acpi_build_update, build_state);
+}
+
+static const VMStateDescription vmstate_virt_acpi_build = {
+    .name = "virt_acpi_build",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_BOOL(patched, AcpiBuildState),
+        VMSTATE_END_OF_LIST()
+    },
+};
+
+void virt_acpi_setup(VirtGuestInfo *guest_info)
+{
+    AcpiBuildTables tables;
+    AcpiBuildState *build_state;
+
+    if (!guest_info->fw_cfg) {
+        trace_virt_acpi_setup();
+        return;
+    }
+
+    if (!acpi_enabled) {
+        trace_virt_acpi_setup();
+        return;
+    }
+
+    build_state = g_malloc0(sizeof *build_state);
+    build_state->guest_info = guest_info;
+
+    acpi_build_tables_init(&tables);
+    virt_acpi_build(build_state->guest_info, &tables);
+
+    /* Now expose it all to Guest */
+    build_state->table_mr = acpi_add_rom_blob(build_state, tables.table_data,
+                                               ACPI_BUILD_TABLE_FILE,
+                                               ACPI_BUILD_TABLE_MAX_SIZE);
+    assert(build_state->table_mr != NULL);
+
+    build_state->linker_mr =
+        acpi_add_rom_blob(build_state, tables.linker, "etc/table-loader", 0);
+
+    fw_cfg_add_file(guest_info->fw_cfg, ACPI_BUILD_TPMLOG_FILE,
+                    tables.tcpalog->data, acpi_data_len(tables.tcpalog));
+
+    build_state->rsdp_mr = acpi_add_rom_blob(build_state, tables.rsdp,
+                                              ACPI_BUILD_RSDP_FILE, 0);
+
+    qemu_register_reset(virt_acpi_build_reset, build_state);
+    virt_acpi_build_reset(build_state);
+    vmstate_register(NULL, 0, &vmstate_virt_acpi_build, build_state);
+
+    /* Cleanup tables but don't free the memory: we track it
+     * in build_state.
+     */
+    acpi_build_tables_cleanup(&tables, false);
+}