arch/loongarch/kernel/machine_kexec_file.c

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

File Facts

System
Linux kernel
Corpus path
arch/loongarch/kernel/machine_kexec_file.c
Extension
.c
Size
6670 bytes
Lines
240
Domain
Architecture Layer
Bucket
arch/loongarch
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 < 0) {
			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 < 0) {
			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);

		/* Add the mem=size@start parameter to the command line */
		cmdline_add_mem(&cmdline_tmplen, modified_cmdline);

		/* Add the elfcorehdr=size@start parameter to the command line */
		cmdline_add_elfcorehdr(image, &cmdline_tmplen, modified_cmdline, headers_sz);
	}
#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 < 0)
			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);

		/* Add the initrd=start,size parameter to the command line */
		cmdline_add_initrd(image, &cmdline_tmplen, modified_cmdline, initrd_load_addr);
	}

	if (cmdline_len + cmdline_tmplen > COMMAND_LINE_SIZE) {
		pr_err("Appending command line exceeds COMMAND_LINE_SIZE\n");
		ret = -EINVAL;
		goto out_err;
	}

	memcpy(modified_cmdline + cmdline_tmplen, cmdline, cmdline_len);
	cmdline = modified_cmdline;
	image->arch.cmdline_ptr = (unsigned long)cmdline;

	return 0;

out_err:
	image->nr_segments = orig_segments;
	kfree(modified_cmdline);
	return ret;
}

Annotation

Implementation Notes