From 361640b4fdc86167b0c25d8e73c08dcaa4ecd28a Mon Sep 17 00:00:00 2001 From: Vincent Whitchurch Date: Wed, 8 Dec 2021 16:11:22 +0100 Subject: [PATCH] um: Extract load file helper from initrd.c The file loading support in initrd.c can be re-used for loading devicetrees. Move it out of initrd.c. Signed-off-by: Vincent Whitchurch Signed-off-by: Richard Weinberger --- arch/um/kernel/Makefile | 1 + arch/um/kernel/initrd.c | 48 ++++-------------------------------- arch/um/kernel/load_file.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++ arch/um/kernel/um_arch.h | 8 ++++++ 4 files changed, 75 insertions(+), 43 deletions(-) create mode 100644 arch/um/kernel/load_file.c create mode 100644 arch/um/kernel/um_arch.h diff --git a/arch/um/kernel/Makefile b/arch/um/kernel/Makefile index 7ab6d40..4ab4a00 100644 --- a/arch/um/kernel/Makefile +++ b/arch/um/kernel/Makefile @@ -18,6 +18,7 @@ obj-y = config.o exec.o exitcode.o irq.o ksyms.o mem.o \ physmem.o process.o ptrace.o reboot.o sigio.o \ signal.o sysrq.o time.o tlb.o trap.o \ um_arch.o umid.o maccess.o kmsg_dump.o capflags.o skas/ +obj-y += load_file.o obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o obj-$(CONFIG_GPROF) += gprof_syms.o diff --git a/arch/um/kernel/initrd.c b/arch/um/kernel/initrd.c index c1981ff..47b8cb1 100644 --- a/arch/um/kernel/initrd.c +++ b/arch/um/kernel/initrd.c @@ -10,37 +10,21 @@ #include #include +#include "um_arch.h" + /* Changed by uml_initrd_setup, which is a setup */ static char *initrd __initdata = NULL; -static int load_initrd(char *filename, void *buf, int size); int __init read_initrd(void) { + unsigned long long size; void *area; - long long size; - int err; - - if (initrd == NULL) - return 0; - err = os_file_size(initrd, &size); - if (err) + if (!initrd) return 0; - /* - * This is necessary because alloc_bootmem craps out if you - * ask for no memory. - */ - if (size == 0) { - printk(KERN_ERR "\"%s\" is a zero-size initrd\n", initrd); - return 0; - } - - area = memblock_alloc(size, SMP_CACHE_BYTES); + area = uml_load_file(initrd, &size); if (!area) - panic("%s: Failed to allocate %llu bytes\n", __func__, size); - - if (load_initrd(initrd, area, size) == -1) return 0; initrd_start = (unsigned long) area; @@ -59,25 +43,3 @@ __uml_setup("initrd=", uml_initrd_setup, " This is used to boot UML from an initrd image. The argument is the\n" " name of the file containing the image.\n\n" ); - -static int load_initrd(char *filename, void *buf, int size) -{ - int fd, n; - - fd = os_open_file(filename, of_read(OPENFLAGS()), 0); - if (fd < 0) { - printk(KERN_ERR "Opening '%s' failed - err = %d\n", filename, - -fd); - return -1; - } - n = os_read_file(fd, buf, size); - if (n != size) { - printk(KERN_ERR "Read of %d bytes from '%s' failed, " - "err = %d\n", size, - filename, -n); - return -1; - } - - os_close_file(fd); - return 0; -} diff --git a/arch/um/kernel/load_file.c b/arch/um/kernel/load_file.c new file mode 100644 index 0000000..5cecd0e --- /dev/null +++ b/arch/um/kernel/load_file.c @@ -0,0 +1,61 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) + */ +#include +#include + +#include "um_arch.h" + +static int __init __uml_load_file(const char *filename, void *buf, int size) +{ + int fd, n; + + fd = os_open_file(filename, of_read(OPENFLAGS()), 0); + if (fd < 0) { + printk(KERN_ERR "Opening '%s' failed - err = %d\n", filename, + -fd); + return -1; + } + n = os_read_file(fd, buf, size); + if (n != size) { + printk(KERN_ERR "Read of %d bytes from '%s' failed, " + "err = %d\n", size, + filename, -n); + return -1; + } + + os_close_file(fd); + return 0; +} + +void *uml_load_file(const char *filename, unsigned long long *size) +{ + void *area; + int err; + + *size = 0; + + if (!filename) + return NULL; + + err = os_file_size(filename, size); + if (err) + return NULL; + + if (*size == 0) { + printk(KERN_ERR "\"%s\" is empty\n", filename); + return NULL; + } + + area = memblock_alloc(*size, SMP_CACHE_BYTES); + if (!area) + panic("%s: Failed to allocate %llu bytes\n", __func__, *size); + + if (__uml_load_file(filename, area, *size)) { + memblock_free(area, *size); + return NULL; + } + + return area; +} diff --git a/arch/um/kernel/um_arch.h b/arch/um/kernel/um_arch.h new file mode 100644 index 0000000..b195df3 --- /dev/null +++ b/arch/um/kernel/um_arch.h @@ -0,0 +1,8 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef __UML_ARCH_H__ +#define __UML_ARCH_H__ + +extern void * __init uml_load_file(const char *filename, unsigned long long *size); + +#endif -- 2.7.4