From d8b1ae4237b5f8cf5037a7f341ff43dc02955256 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Tue, 8 Sep 2015 17:38:43 +0100 Subject: [PATCH] hw/arm: new interface for devices which need to behave differently for kernel boot For ARM we have a little minimalist bootloader in hw/arm/boot.c which takes the place of firmware if we're directly booting a Linux kernel. Unfortunately a few devices need special case handling in this situation to do the initialization which on real hardware would be done by firmware. (In particular if we're booting a kernel in NonSecure state then we need to make a TZ-aware GIC put all its interrupts into Group 1, or the guest will be unable to use them.) Create a new QOM interface which can be implemented by devices which need to do something different from their default reset behaviour. The callback will be called after machine initialization and before first reset. Suggested-by: Peter Crosthwaite Signed-off-by: Peter Maydell Reviewed-by: Edgar E. Iglesias Reviewed-by: Peter Maydell Tested-by: Edgar E. Iglesias Message-id: 1441383782-24378-3-git-send-email-peter.maydell@linaro.org --- hw/arm/boot.c | 34 +++++++++++++++++++++++++++ include/hw/arm/linux-boot-if.h | 43 ++++++++++++++++++++++++++++++++++ 2 files changed, 77 insertions(+) create mode 100644 include/hw/arm/linux-boot-if.h diff --git a/hw/arm/boot.c b/hw/arm/boot.c index 5b969cda1c..bef451b3b2 100644 --- a/hw/arm/boot.c +++ b/hw/arm/boot.c @@ -10,6 +10,7 @@ #include "config.h" #include "hw/hw.h" #include "hw/arm/arm.h" +#include "hw/arm/linux-boot-if.h" #include "sysemu/sysemu.h" #include "hw/boards.h" #include "hw/loader.h" @@ -555,6 +556,20 @@ static void load_image_to_fw_cfg(FWCfgState *fw_cfg, uint16_t size_key, fw_cfg_add_bytes(fw_cfg, data_key, data, size); } +static int do_arm_linux_init(Object *obj, void *opaque) +{ + if (object_dynamic_cast(obj, TYPE_ARM_LINUX_BOOT_IF)) { + ARMLinuxBootIf *albif = ARM_LINUX_BOOT_IF(obj); + ARMLinuxBootIfClass *albifc = ARM_LINUX_BOOT_IF_GET_CLASS(obj); + struct arm_boot_info *info = opaque; + + if (albifc->arm_linux_init) { + albifc->arm_linux_init(albif, info->secure_boot); + } + } + return 0; +} + static void arm_load_kernel_notify(Notifier *notifier, void *data) { CPUState *cs; @@ -778,6 +793,12 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data) if (info->nb_cpus > 1) { info->write_secondary_boot(cpu, info); } + + /* Notify devices which need to fake up firmware initialization + * that we're doing a direct kernel boot. + */ + object_child_foreach_recursive(object_get_root(), + do_arm_linux_init, info); } info->is_linux = is_linux; @@ -803,3 +824,16 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info) qemu_register_reset(do_cpu_reset, ARM_CPU(cs)); } } + +static const TypeInfo arm_linux_boot_if_info = { + .name = TYPE_ARM_LINUX_BOOT_IF, + .parent = TYPE_INTERFACE, + .class_size = sizeof(ARMLinuxBootIfClass), +}; + +static void arm_linux_boot_register_types(void) +{ + type_register_static(&arm_linux_boot_if_info); +} + +type_init(arm_linux_boot_register_types) diff --git a/include/hw/arm/linux-boot-if.h b/include/hw/arm/linux-boot-if.h new file mode 100644 index 0000000000..aba4479a14 --- /dev/null +++ b/include/hw/arm/linux-boot-if.h @@ -0,0 +1,43 @@ +/* + * hw/arm/linux-boot-if.h : interface for devices which need to behave + * specially for direct boot of an ARM Linux kernel + */ + +#ifndef HW_ARM_LINUX_BOOT_IF_H +#define HW_ARM_LINUX_BOOT_IF_H + +#include "qom/object.h" + +#define TYPE_ARM_LINUX_BOOT_IF "arm-linux-boot-if" +#define ARM_LINUX_BOOT_IF_CLASS(klass) \ + OBJECT_CLASS_CHECK(ARMLinuxBootIfClass, (klass), TYPE_ARM_LINUX_BOOT_IF) +#define ARM_LINUX_BOOT_IF_GET_CLASS(obj) \ + OBJECT_GET_CLASS(ARMLinuxBootIfClass, (obj), TYPE_ARM_LINUX_BOOT_IF) +#define ARM_LINUX_BOOT_IF(obj) \ + INTERFACE_CHECK(ARMLinuxBootIf, (obj), TYPE_ARM_LINUX_BOOT_IF) + +typedef struct ARMLinuxBootIf { + /*< private >*/ + Object parent_obj; +} ARMLinuxBootIf; + +typedef struct ARMLinuxBootIfClass { + /*< private >*/ + InterfaceClass parent_class; + + /*< public >*/ + /** arm_linux_init: configure the device for a direct boot + * of an ARM Linux kernel (so that device reset puts it into + * the state the kernel expects after firmware initialization, + * rather than the true hardware reset state). This callback is + * called once after machine construction is complete (before the + * first system reset). + * + * @obj: the object implementing this interface + * @secure_boot: true if we are booting Secure, false for NonSecure + * (or for a CPU which doesn't support TrustZone) + */ + void (*arm_linux_init)(ARMLinuxBootIf *obj, bool secure_boot); +} ARMLinuxBootIfClass; + +#endif