vdev_register_factory()

https://www.qnx.com/developers/docs/7.0.0/index.html#com.qnx.doc.hypervisor.vdev.api/topic/vdev_register_factory.html

如 qnx 官网资料介绍，vdev_register_factory() 方法将 vdev 工厂添加到可用的vdevs 工厂列表中．

#include <qvm/vdev-core.h>void vdev_register_factory(struct vdev_factory *factory,unsigned abi_version)参数：
factoryThe virtual device factory structure to be added. This structure must have a static lifetime. abi_versionThe ABI version, checked against QVM_VDEV_ABI.

该函数通常由构造 vdev 的例程调用，通常在vdev由带有__attribute__((constructor))的函数加载时调用。

当您调用这个函数时，您将一个指针传递给 vdev_factory 结构。在 vdev 的生命周期中，这是惟一一次传递这个指针。

vdev_factory

#include <qvm/vdev-core.h>struct vdev_factory {struct vdev_factory* next;int (*control)(vdev_t *vdev, unsigned ctrl, const char *arg);enum vdev_ref_status (*vread)(vdev_t *vdev, unsigned cookie, const struct qvm_state_block *vopnd,const struct qvm_state_block *oopnd,struct guest_cpu *gcp);enum vdev_ref_status (*vwrite)(vdev_t *vdev, unsigned cookie, const struct qvm_state_block *vopnd,const struct qvm_state_block *oopnd,struct guest_cpu *gcp);int (*pulse)(vdev_t *vdev, int8_t code);void (*timer)(vdev_t *vdev, void *data,const struct guest_timer_data *tdp, struct guest_cpu *gcp);const struct vdev_pic_functions* pic;const char *const * option_list;const char* name;unsigned factory_flags;unsigned acc_sizes;unsigned extra_space;unsigned safety;
} ;Data:struct vdev_factory* nextA pointer to next entry in a linked list of structures Initialized by qvm.
int (*control)(vdev_t *vdev, unsigned ctrl, const char *arg)Required function to perform various operations on the vdev (see VDEV_CTRL_* macros)
enum vdev_ref_status (*vread)(vdev_t *vdev, unsigned cookie, const struct qvm_state_block *vopnd, const struct qvm_state_block *oopnd, struct guest_cpu *gcp)Optional function to handle a read from the vdev. If you don't handle this request, behavior is as specified by the unsupported option in the VM configuration (see the unsupported option in the QHS 2.0 User's Guide).
enum vdev_ref_status (*vwrite)(vdev_t *vdev, unsigned cookie, const struct qvm_state_block *vopnd, const struct qvm_state_block *oopnd, struct guest_cpu *gcp)Optional function to handle a write to the vdev. If you don't handle this request, behavior is as specified by the unsupported option in the VM configuration (see the unsupported option in the QHS 2.0 User's Guide).
int (*pulse)(vdev_t *vdev, int8_t code)Optional function to handle a pulse delivery for the vdev. Optional: if you send pulse to yourself, you need this vdev, or you'll get a crash.
void (*timer)(vdev_t *vdev, void *data, const struct guest_timer_data *tdp, struct guest_cpu *gcp)Optional function to handle a timer or trigger notification for the vdev. If you use guest_timer_notify(), you need this, or you'll get a crash.
const struct vdev_pic_functions* picPIC-specific operations. See vdev_pic_functions.
const char *const * option_listA pointer to an array of vdev-specific options (Optional: VDEV_CTRL_FIRST_OPTIDX).
const char* nameThe name of the vdev type. If NULL, the name is filled in with the name of the shared object the factory is in. This should typically be NULL. The qvm process adds the vdev- prefix and the .so suffix.
unsigned factory_flagsBit set of vdev_factory_flags values to control parsing and creation of the device. See above.
unsigned acc_sizesBit set of (1u << byte_size) values for a list of allowed access sizes.
unsigned extra_spaceThe number of additional bytes to allocate in the vdev_s structure for the device-specific state. A pointer to that space is stored in the vdev_s structure's v_device member.
unsigned safetySpecify if this is the safety version of the vdev; if this is the safety version, you should use VDEV_SAFETY_SELECTED.

vdev 驱动例子

其中 "__attribute__((constructor))" ，这个扩展和C＋＋的构造函数很像，它会在main函数之前由程序加载器自动调用，与之相对的是destructor，它会在main函数执行结束或者exit的时候自动调用，由于两个扩展是一对。

它有如下规则

构造函数先于main函数而执行
不同构造函数如果在同一个文件中，则先出现的函数后执行
对于不同文件中的构造函数，编译命令中后出现的.c文件的构造函数先执行

vdev_factory 对应的成员变量，如函数指针要自行进行实现。

static void __attribute__((constructor)) vio_i2c_register(void)
{static const char * const vio_i2c_options[] = { "verbose", "device", NULL };static struct vdev_factory vio_i2c_factory = {.next = NULL, // patched.control = vio_i2c_control,.vread = vio_i2c_vread,.vwrite = vio_i2c_vwrite,.option_list = vio_i2c_options,.name = NULL, // patched.factory_flags = VFF_NONE,.acc_sizes = 1u << sizeof(uint32_t),.extra_space = sizeof(vio_i2c_dev_t),.safety = VDEV_SAFETY_SELECTED,};vdev_register_factory(&vio_i2c_factory, QVM_VDEV_ABI);
}

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QNX vdev 创建驱动程序流程

vdev_register_factory()

vdev_factory

vdev 驱动例子

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