This patch cleans up image generation in several ways: - Firstly, it removes tools/build, and uses binutils to do all the final construction of the bzImage. This removes a chunk of code and makes the image generation more flexible, since we can compute various numbers rather than be forced to use fixed constants. - Rename compressed/vmlinux to compressed/blob, to make it a bit clearer that it's the compressed kernel image + decompressor (now all the files named "vmlinux*" are directly derived from the kernel vmlinux). - Rather than using objcopy to wrap the compressed kernel into an object file, simply use the assembler: payload.S does a .bininc of the blob.bin file, which allows us to easily place it into a section, and it makes the Makefile dependency a little clearer. - Similarly, use the same technique to create compressed/piggy.o, which cleans things up even more, since the .S file can also set the input and output_size symbols without further linker script hackery; it also removes a complete linker script. - Also, remove stray "sti" Signed-off-by: Jeremy Fitzhardinge Cc: "Eric W. Biederman" Cc: H. Peter Anvin Cc: Vivek Goyal Cc: Rusty Russell --- arch/i386/boot/Makefile | 31 +----- arch/i386/boot/compressed/Makefile | 13 -- arch/i386/boot/compressed/piggy.S | 10 + arch/i386/boot/compressed/vmlinux.scr | 10 - arch/i386/boot/header.S | 7 - arch/i386/boot/payload.S | 3 arch/i386/boot/setup.ld | 37 ++++--- arch/i386/boot/tools/.gitignore | 1 arch/i386/boot/tools/build.c | 168 --------------------------------- 9 files changed, 55 insertions(+), 225 deletions(-) =================================================================== --- a/arch/i386/boot/Makefile +++ b/arch/i386/boot/Makefile @@ -25,12 +25,13 @@ SVGA_MODE := -DSVGA_MODE=NORMAL_VGA #RAMDISK := -DRAMDISK=512 -targets := vmlinux.bin setup.bin setup.elf zImage bzImage +targets := blob.bin setup.elf zImage bzImage subdir- := compressed setup-y += a20.o apm.o cmdline.o copy.o cpu.o cpucheck.o edd.o -setup-y += header.o main.o mca.o memory.o pm.o pmjump.o -setup-y += printf.o string.o tty.o video.o version.o voyager.o +setup-y += header.o main.o mca.o memory.o payload.o pm.o +setup-y += pmjump.o printf.o string.o tty.o video.o version.o +setup-y += voyager.o # The link order of the video-*.o modules can matter. In particular, # video-vga.o *must* be listed first, followed by video-vesa.o. @@ -39,10 +40,6 @@ setup-y += video-vga.o setup-y += video-vga.o setup-y += video-vesa.o setup-y += video-bios.o - -hostprogs-y := tools/build - -HOSTCFLAGS_build.o := $(LINUXINCLUDE) # --------------------------------------------------------------------------- @@ -65,18 +62,12 @@ AFLAGS := $(CFLAGS) -D__ASSEMBLY__ $(obj)/bzImage: IMAGE_OFFSET := 0x100000 $(obj)/bzImage: EXTRA_CFLAGS := -D__BIG_KERNEL__ $(obj)/bzImage: EXTRA_AFLAGS := $(SVGA_MODE) $(RAMDISK) -D__BIG_KERNEL__ -$(obj)/bzImage: BUILDFLAGS := -b -quiet_cmd_image = BUILD $@ -cmd_image = $(obj)/tools/build $(BUILDFLAGS) $(obj)/setup.bin \ - $(obj)/vmlinux.bin $(ROOT_DEV) > $@ - -$(obj)/zImage $(obj)/bzImage: $(obj)/setup.bin \ - $(obj)/vmlinux.bin $(obj)/tools/build FORCE - $(call if_changed,image) +$(obj)/zImage $(obj)/bzImage: $(obj)/setup.elf FORCE + $(call if_changed,objcopy) @echo 'Kernel: $@ is ready' ' (#'`cat .version`')' -$(obj)/vmlinux.bin: $(obj)/compressed/vmlinux FORCE +$(obj)/blob.bin: $(obj)/compressed/blob FORCE $(call if_changed,objcopy) SETUP_OBJS = $(addprefix $(obj)/,$(setup-y)) @@ -85,12 +76,10 @@ LDFLAGS_setup.elf := -T $(obj)/setup.elf: $(src)/setup.ld $(SETUP_OBJS) FORCE $(call if_changed,ld) -OBJCOPYFLAGS_setup.bin := -O binary +$(obj)/payload.o: EXTRA_AFLAGS := -Wa,-I$(obj) +$(obj)/payload.o: $(src)/payload.S $(obj)/blob.bin -$(obj)/setup.bin: $(obj)/setup.elf FORCE - $(call if_changed,objcopy) - -$(obj)/compressed/vmlinux: FORCE +$(obj)/compressed/blob: FORCE $(Q)$(MAKE) $(build)=$(obj)/compressed IMAGE_OFFSET=$(IMAGE_OFFSET) $@ # Set this if you want to pass append arguments to the zdisk/fdimage/isoimage kernel =================================================================== --- a/arch/i386/boot/compressed/Makefile +++ b/arch/i386/boot/compressed/Makefile @@ -4,11 +4,10 @@ # create a compressed vmlinux image from the original vmlinux # -targets := vmlinux vmlinux.bin vmlinux.bin.gz head.o misc.o piggy.o \ +targets := blob vmlinux.bin vmlinux.bin.gz head.o misc.o piggy.o \ vmlinux.bin.all vmlinux.relocs -EXTRA_AFLAGS := -traditional -LDFLAGS_vmlinux := -T +LDFLAGS_blob := -T hostprogs-y := relocs CFLAGS := -m32 -D__KERNEL__ $(LINUX_INCLUDE) -O2 \ @@ -17,7 +16,7 @@ CFLAGS := -m32 -D__KERNEL__ $(LINUX_INC $(call cc-option,-fno-stack-protector) LDFLAGS := -m elf_i386 -$(obj)/vmlinux: $(src)/vmlinux.lds $(obj)/head.o $(obj)/misc.o $(obj)/piggy.o FORCE +$(obj)/blob: $(src)/vmlinux.lds $(obj)/head.o $(obj)/misc.o $(obj)/piggy.o FORCE $(call if_changed,ld) @: @@ -44,7 +43,5 @@ else $(call if_changed,gzip) endif -LDFLAGS_piggy.o := -r --format binary --oformat elf32-i386 -T - -$(obj)/piggy.o: $(src)/vmlinux.scr $(obj)/vmlinux.bin.gz FORCE - $(call if_changed,ld) +$(obj)/piggy.o: EXTRA_AFLAGS := -Wa,-I$(obj) +$(obj)/piggy.o: $(src)/piggy.S $(obj)/vmlinux.bin.gz =================================================================== --- /dev/null +++ b/arch/i386/boot/compressed/piggy.S @@ -0,0 +1,10 @@ +.section .data.compressed,"a",@progbits + +.globl input_data, input_len, output_len + +input_len: .long input_data_end - input_data + +input_data: +.incbin "vmlinux.bin.gz" +output_len = .-4 +input_data_end: =================================================================== --- a/arch/i386/boot/compressed/vmlinux.scr +++ /dev/null @@ -1,10 +0,0 @@ -SECTIONS -{ - .data.compressed : { - input_len = .; - LONG(input_data_end - input_data) input_data = .; - *(.data) - output_len = . - 4; - input_data_end = .; - } -} =================================================================== --- a/arch/i386/boot/header.S +++ b/arch/i386/boot/header.S @@ -97,9 +97,9 @@ bugger_off_msg: .section ".header", "a" .globl hdr hdr: -setup_sects: .byte SETUPSECTS +setup_sects: .byte _setup_sects root_flags: .word ROOT_RDONLY -syssize: .long SYSSIZE +syssize: .long kernel_size_para ram_size: .word RAMDISK vid_mode: .word SVGA_MODE root_dev: .word ROOT_DEV @@ -148,7 +148,7 @@ CAN_USE_HEAP = 0x80 # If set, the load .byte LOADED_HIGH #endif -setup_move_size: .word 0x8000 # size to move, when setup is not +setup_move_size: .word _setup_size # size to move, when setup is not # loaded at 0x90000. We will move setup # to 0x90000 then just before jumping # into the kernel. However, only the @@ -246,7 +246,6 @@ setup2: jnz 1f movw $0xfffc, %sp # Make sure we're not zero 1: movzwl %sp, %esp # Clear upper half of %esp - sti # Check signature at end of setup cmpl $0x5a5aaa55, setup_sig =================================================================== --- /dev/null +++ b/arch/i386/boot/payload.S @@ -0,0 +1,3 @@ +.section .kernel,"a",@progbits + +.incbin "blob.bin" =================================================================== --- a/arch/i386/boot/setup.ld +++ b/arch/i386/boot/setup.ld @@ -3,18 +3,16 @@ * * Linker script for the i386 setup code */ -OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386") +OUTPUT_FORMAT("elf32-i386") OUTPUT_ARCH(i386) ENTRY(_start) SECTIONS { - . = 0; - .bstext : { *(.bstext) } + .bstext 0 : { *(.bstext) } .bsdata : { *(.bsdata) } - . = 497; - .header : { *(.header) } + .header 497 : { *(.header) } .inittext : { *(.inittext) } .initdata : { *(.initdata) } .text : { *(.text*) } @@ -38,16 +36,29 @@ SECTIONS . = ALIGN(16); - __bss_start = .; - .bss : - { - *(.bss) - } - . = ALIGN(16); + .bss ALIGN(16) : { + __bss_start = .; + *(.bss) + . = ALIGN(16); + } _end = .; /DISCARD/ : { *(.note*) } - . = ASSERT(_end <= 0x8000, "Setup too big!"); - . = ASSERT(hdr == 0x1f1, "The setup header has the wrong offset!"); + . = ALIGN(512); /* align to sector size */ + _setup_size = . - _start; + _setup_sects = _setup_size / 512; + + /* compressed kernel data */ + .kernel : { + kernel = .; + *(.kernel) + kernel_end = .; + + } + kernel_size = kernel_end - kernel; + kernel_size_para = (kernel_size + 15) / 16; } + +ASSERT(_end <= 0x8000, "Setup too big!"); +ASSERT(hdr == 0x1f1, "The setup header has the wrong offset!"); =================================================================== --- a/arch/i386/boot/tools/.gitignore +++ /dev/null @@ -1,1 +0,0 @@ -build =================================================================== --- a/arch/i386/boot/tools/build.c +++ /dev/null @@ -1,168 +0,0 @@ -/* - * Copyright (C) 1991, 1992 Linus Torvalds - * Copyright (C) 1997 Martin Mares - * Copyright (C) 2007 H. Peter Anvin - */ - -/* - * This file builds a disk-image from three different files: - * - * - setup: 8086 machine code, sets up system parm - * - system: 80386 code for actual system - * - * It does some checking that all files are of the correct type, and - * just writes the result to stdout, removing headers and padding to - * the right amount. It also writes some system data to stderr. - */ - -/* - * Changes by tytso to allow root device specification - * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996 - * Cross compiling fixes by Gertjan van Wingerde, July 1996 - * Rewritten by Martin Mares, April 1997 - * Substantially overhauled by H. Peter Anvin, April 2007 - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -typedef unsigned char u8; -typedef unsigned short u16; -typedef unsigned long u32; - -#define DEFAULT_MAJOR_ROOT 0 -#define DEFAULT_MINOR_ROOT 0 - -/* Minimal number of setup sectors */ -#define SETUP_SECT_MIN 5 -#define SETUP_SECT_MAX 64 - -/* This must be large enough to hold the entire setup */ -u8 buf[SETUP_SECT_MAX*512]; -int is_big_kernel; - -static void die(const char * str, ...) -{ - va_list args; - va_start(args, str); - vfprintf(stderr, str, args); - fputc('\n', stderr); - exit(1); -} - -static void usage(void) -{ - die("Usage: build [-b] setup system [rootdev] [> image]"); -} - -int main(int argc, char ** argv) -{ - unsigned int i, sz, setup_sectors; - int c; - u32 sys_size; - u8 major_root, minor_root; - struct stat sb; - FILE *file; - int fd; - void *kernel; - - if (argc > 2 && !strcmp(argv[1], "-b")) - { - is_big_kernel = 1; - argc--, argv++; - } - if ((argc < 3) || (argc > 4)) - usage(); - if (argc > 3) { - if (!strcmp(argv[3], "CURRENT")) { - if (stat("/", &sb)) { - perror("/"); - die("Couldn't stat /"); - } - major_root = major(sb.st_dev); - minor_root = minor(sb.st_dev); - } else if (strcmp(argv[3], "FLOPPY")) { - if (stat(argv[3], &sb)) { - perror(argv[3]); - die("Couldn't stat root device."); - } - major_root = major(sb.st_rdev); - minor_root = minor(sb.st_rdev); - } else { - major_root = 0; - minor_root = 0; - } - } else { - major_root = DEFAULT_MAJOR_ROOT; - minor_root = DEFAULT_MINOR_ROOT; - } - fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root); - - /* Copy the setup code */ - file = fopen(argv[1], "r"); - if (!file) - die("Unable to open `%s': %m", argv[1]); - c = fread(buf, 1, sizeof(buf), file); - if (ferror(file)) - die("read-error on `setup'"); - if (c < 1024) - die("The setup must be at least 1024 bytes"); - if (buf[510] != 0x55 || buf[511] != 0xaa) - die("Boot block hasn't got boot flag (0xAA55)"); - fclose(file); - - /* Pad unused space with zeros */ - setup_sectors = (c + 511) / 512; - if (setup_sectors < SETUP_SECT_MIN) - setup_sectors = SETUP_SECT_MIN; - i = setup_sectors*512; - memset(buf+c, 0, i-c); - - /* Set the default root device */ - buf[508] = minor_root; - buf[509] = major_root; - - fprintf(stderr, "Setup is %d bytes (padded to %d bytes).\n", c, i); - - /* Open and stat the kernel file */ - fd = open(argv[2], O_RDONLY); - if (fd < 0) - die("Unable to open `%s': %m", argv[2]); - if (fstat(fd, &sb)) - die("Unable to stat `%s': %m", argv[2]); - sz = sb.st_size; - fprintf (stderr, "System is %d kB\n", (sz+1023)/1024); - kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0); - if (kernel == MAP_FAILED) - die("Unable to mmap '%s': %m", argv[2]); - sys_size = (sz + 15) / 16; - if (!is_big_kernel && sys_size > DEF_SYSSIZE) - die("System is too big. Try using bzImage or modules."); - - /* Patch the setup code with the appropriate size parameters */ - buf[0x1f1] = setup_sectors-1; - buf[0x1f4] = sys_size; - buf[0x1f5] = sys_size >> 8; - buf[0x1f6] = sys_size >> 16; - buf[0x1f7] = sys_size >> 24; - - if (fwrite(buf, 1, i, stdout) != i) - die("Writing setup failed"); - - /* Copy the kernel code */ - if (fwrite(kernel, 1, sz, stdout) != sz) - die("Writing kernel failed"); - close(fd); - - /* Everything is OK */ - return 0; -} -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/