arch/arm64/kernel/machine_kexec_file.c

Source file repositories/reference/linux-study-clean/arch/arm64/kernel/machine_kexec_file.c

File Facts

System
Linux kernel
Corpus path
arch/arm64/kernel/machine_kexec_file.c
Extension
.c
Size
4712 bytes
Lines
202
Domain
Architecture Layer
Bucket
arch/arm64
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

if (ret) {
			pr_err("Preparing elf core header failed\n");
			goto out_err;
		}

		kbuf.buffer = headers;
		kbuf.bufsz = headers_sz;
		kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
		kbuf.memsz = headers_sz;
		kbuf.buf_align = SZ_64K; /* largest supported page size */
		kbuf.buf_max = ULONG_MAX;
		kbuf.top_down = true;

		ret = kexec_add_buffer(&kbuf);
		if (ret) {
			vfree(headers);
			goto out_err;
		}
		image->elf_headers = headers;
		image->elf_load_addr = kbuf.mem;
		image->elf_headers_sz = headers_sz;

		kexec_dprintk("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
			      image->elf_load_addr, kbuf.bufsz, kbuf.memsz);

		ret = crash_load_dm_crypt_keys(image);
		if (ret)
			goto out_err;
	}
#endif

	/* load initrd */
	if (initrd) {
		kbuf.buffer = initrd;
		kbuf.bufsz = initrd_len;
		kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
		kbuf.memsz = initrd_len;
		kbuf.buf_align = 0;
		/* within 1GB-aligned window of up to 32GB in size */
		kbuf.buf_max = round_down(kernel_load_addr, SZ_1G)
						+ (unsigned long)SZ_1G * 32;
		kbuf.top_down = false;

		ret = kexec_add_buffer(&kbuf);
		if (ret)
			goto out_err;
		initrd_load_addr = kbuf.mem;

		kexec_dprintk("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
			      initrd_load_addr, kbuf.bufsz, kbuf.memsz);
	}

	/* load dtb */
	dtb = of_kexec_alloc_and_setup_fdt(image, initrd_load_addr,
					   initrd_len, cmdline, 0);
	if (!dtb) {
		pr_err("Preparing for new dtb failed\n");
		ret = -EINVAL;
		goto out_err;
	}

	/* trim it */
	fdt_pack(dtb);
	dtb_len = fdt_totalsize(dtb);
	kbuf.buffer = dtb;
	kbuf.bufsz = dtb_len;
	kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
	kbuf.memsz = dtb_len;
	/* not across 2MB boundary */
	kbuf.buf_align = SZ_2M;
	kbuf.buf_max = ULONG_MAX;
	kbuf.top_down = true;

	ret = kexec_add_buffer(&kbuf);
	if (ret)
		goto out_err;
	image->arch.dtb = dtb;
	image->arch.dtb_mem = kbuf.mem;

	kexec_dprintk("Loaded dtb at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
		      kbuf.mem, kbuf.bufsz, kbuf.memsz);

	return 0;

out_err:
	image->nr_segments = orig_segments;
	kvfree(dtb);
	return ret;
}

Annotation

Implementation Notes