[Xen-devel] Magic numbers in xen-arm hypercall

[Sengul Thomas <thomas.sengul@xxxxxxxxx>]

Hello,

I saw some scary magic numbers in linux/arch/arm/hypercall.S, which are:

#define XEN_IMM 0xEA1


and in arch/arm/include/asm/opcodes-virt.h, which are

#define __HVC(imm16) __inst_arm_thumb32(                                \
        0xE1400070 | (((imm16) & 0xFFF0) << 4) | ((imm16) & 0x000F),    \
        0xF7E08000 | (((imm16) & 0xF000) << 4) | ((imm16) & 0x0FFF)     \
)

all that I know is those are used for hypercalls.
Could you give any hint or reference that I can learn those magic numbers?

thanks,
Thomas

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel