domain create分析

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struct domain *domain_create(domid_t dom_id, unsigned int cpu)

分配一个struct domain空间，并初始化此空间

之后执行construct_dom0

int construct_dom0(struct domain *d,

unsigned long guest_start, unsigned long guest_size,

unsigned long image_start, unsigned long image_size,

unsigned long initrd_start, unsigned long initrd_size,

char *cmdline)

模拟器启动参数都保存在domain_addrs[]中，其中domain0的相关属性为：

{

MEMMAP_GUEST_0_START_PADDR, // guest memory start 0x00200000

0x05e00000,//MEMMAP_GUEST_0_SIZE, // guest memory size 0x05e00000

MEMMAP_GUEST_0_ELF_IMAGE_PADDR, // elf image address 0x01c00000

// _binary_mini_start,

MEMMAP_GUEST_0_ELF_MAX_SIZE, // elf image size 0x00400000

MEMMAP_GUEST_0_RAMDISK_IMAGE_PADDR,//0, // ramdisk image address 0x00800000

0x00046daf,//MEMMAP_GUEST_0_RAMDISK_SIZE,//0, // ramdisk image size 0x00046daf

0, // commandline

}

要想指定Xen ARM的启动位置，需要修改此数据结构。当然，首先要将domain镜像加载如内存。

附domain和domain_addrs的定义

struct domain

{

domid_t domain_id;

shared_info_t *shared_info; /* shared data area */

spinlock_t big_lock;

spinlock_t page_alloc_lock; /* protects all the following fields */

struct list_head page_list; /* linked list, of size tot_pages */

struct list_head xenpage_list; /* linked list, of size xenheap_pages */

unsigned int tot_pages; /* number of pages currently possesed */

unsigned int max_pages; /* maximum value for tot_pages */

unsigned int xenheap_pages; /* # pages allocated from Xen heap */

/* Scheduling. */

int shutdown_code; /* code value from OS (if DOMF_shutdown) */

void *sched_priv; /* scheduler-specific data */

struct domain *next_in_list;

struct domain *next_in_hashbucket;

struct list_head rangesets;

spinlock_t rangesets_lock;

/* Event channel information. */

struct evtchn *evtchn[NR_EVTCHN_BUCKETS];

spinlock_t evtchn_lock;

grant_table_t *grant_table;

* Interrupt to event-channel mappings. Updates should be protected by the

* domain's event-channel spinlock. Read accesses can also synchronise on

* the lock, but races don't usually matter.

#define NR_PIRQS 256 /* Put this somewhere sane! */

u16 pirq_to_evtchn[NR_PIRQS];

u32 pirq_mask[NR_PIRQS/32];

/* I/O capabilities (access to IRQs and memory-mapped I/O). */

struct rangeset *iomem_caps;

struct rangeset *irq_caps;

struct rangeset *dma_caps;

unsigned long domain_flags;

unsigned long vm_assist;

atomic_t refcnt;

struct vcpu *vcpu[MAX_VIRT_CPUS];

/* Bitmask of CPUs which are holding onto this domain's state. */

cpumask_t domain_dirty_cpumask;

struct arch_domain arch;

void *ssid; /* sHype security subject identifier */

/* Control-plane tools handle for this domain. */

xen_domain_handle_t handle;

uint32_t store_port; //for xenstore kcr

unsigned long store_mfn; //for xenstore kcr

uint32_t console_port; //for console ldh

unsigned long console_mfn; //for console ldh

/* For ACM */

unsigned long scid;

uint8_t acm_batterylife;

uint16_t acm_battery_save_mode;

uint16_t acm_shutdown;

u32 *status;

void *scan_code;

};

struct domain_addr_set domain_addrs[4]= {

{

MEMMAP_GUEST_0_START_PADDR, // guest memory start

0x05e00000,//MEMMAP_GUEST_0_SIZE, // guest memory size

MEMMAP_GUEST_0_ELF_IMAGE_PADDR, // elf image address

// _binary_mini_start,

MEMMAP_GUEST_0_ELF_MAX_SIZE, // elf image size

MEMMAP_GUEST_0_RAMDISK_IMAGE_PADDR,//0, // ramdisk image address

0x00046daf,//MEMMAP_GUEST_0_RAMDISK_SIZE,//0, // ramdisk image size

0, // commandline

{

MEMMAP_GUEST_1_START_PADDR, // guest memory start

MEMMAP_GUEST_1_SIZE, // guest memory size

MEMMAP_GUEST_1_ELF_IMAGE_PADDR, // elf image address

//_binary_mini_start,

MEMMAP_GUEST_1_ELF_MAX_SIZE, // elf image size

0, // ramdisk image address

0, // ramdisk image size

0, // commandline

{

MEMMAP_GUEST_2_START_PADDR, // guest memory start

MEMMAP_GUEST_2_SIZE, // guest memory size

MEMMAP_GUEST_2_ELF_IMAGE_PADDR, // elf image address

MEMMAP_GUEST_2_ELF_MAX_SIZE, // elf image size

0, // ramdisk image address

0, // ramdisk image size

0, // commandline

{

MEMMAP_GUEST_3_START_PADDR, // guest memory start

MEMMAP_GUEST_3_SIZE, // guest memory size

MEMMAP_GUEST_3_ELF_IMAGE_PADDR, // elf image address

MEMMAP_GUEST_3_ELF_MAX_SIZE, // elf image size

0, // ramdisk image address

0, // ramdisk image size

0, // commandline

};