Differential D40266 Diff 122443 sys/cddl/dev/kinst/trampoline.c

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sys/cddl/dev/kinst/trampoline.c

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	kinst_trampchunk_alloc(void)			kinst_trampchunk_alloc(void)
	{			{
	struct trampchunk *chunk;			struct trampchunk *chunk;
	vm_offset_t trampaddr;			vm_offset_t trampaddr;
	int error __diagused;			int error __diagused;

	sx_assert(&kinst_tramp_sx, SX_XLOCKED);			sx_assert(&kinst_tramp_sx, SX_XLOCKED);

				#ifdef __amd64__
	/*			/*
	* Allocate virtual memory for the trampoline chunk. The returned			* To simplify population of trampolines, we follow the amd64 kernel's
	* address is saved in "trampaddr". To simplify population of			* code model and allocate them above KERNBASE, i.e., in the top 2GB of
	* trampolines, we follow the amd64 kernel's code model and allocate			* the kernel's virtual address space (not the case for other
	* them above KERNBASE, i.e., in the top 2GB of the kernel's virtual			* platforms).
	* address space. Trampolines must be executable so max_prot must
	* include VM_PROT_EXECUTE.
	*/			*/
	trampaddr = KERNBASE;			trampaddr = KERNBASE;
				#else
				trampaddr = VM_MIN_KERNEL_ADDRESS;
				#endif
				/*
				* Allocate virtual memory for the trampoline chunk. The returned
				* address is saved in "trampaddr". Trampolines must be executable so
				* max_prot must include VM_PROT_EXECUTE.
				*/
	error = vm_map_find(kernel_map, NULL, 0, &trampaddr,			error = vm_map_find(kernel_map, NULL, 0, &trampaddr,
	KINST_TRAMPCHUNK_SIZE, 0, VMFS_ANY_SPACE, VM_PROT_ALL, VM_PROT_ALL,			KINST_TRAMPCHUNK_SIZE, 0, VMFS_ANY_SPACE, VM_PROT_ALL, VM_PROT_ALL,
	0);			0);
	if (error != KERN_SUCCESS) {			if (error != KERN_SUCCESS) {
	KINST_LOG("trampoline chunk allocation failed: %d", error);			KINST_LOG("trampoline chunk allocation failed: %d", error);
	return (NULL);			return (NULL);
	}			}

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