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Use the new x86 setup code for i386
This patch hooks the new x86 setup code into the Makefile machinery. It also adapts boot/tools/build.c to a two-file (as opposed to three-file) universe, and simplifies it substantially. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
H. Peter Anvin
Linus Torvalds
parent
f2d98ae63d
commit
4fd06960f1
@ -25,27 +25,56 @@ SVGA_MODE := -DSVGA_MODE=NORMAL_VGA
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#RAMDISK := -DRAMDISK=512
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targets := vmlinux.bin bootsect bootsect.o \
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setup setup.o zImage bzImage
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targets := vmlinux.bin setup.bin setup.elf zImage bzImage
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subdir- := compressed
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setup-y += a20.o apm.o cmdline.o copy.o cpu.o cpucheck.o edd.o
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setup-y += header.o main.o mca.o memory.o pm.o pmjump.o
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setup-y += printf.o string.o tty.o video.o version.o voyager.o
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# The link order of the video-*.o modules can matter. In particular,
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# video-vga.o *must* be listed first, followed by video-vesa.o.
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# Hardware-specific drivers should follow in the order they should be
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# probed, and video-bios.o should typically be last.
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setup-y += video-vga.o
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setup-y += video-vesa.o
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setup-y += video-bios.o
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hostprogs-y := tools/build
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HOSTCFLAGS_build.o := $(LINUXINCLUDE)
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# ---------------------------------------------------------------------------
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# How to compile the 16-bit code. Note we always compile for -march=i386,
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# that way we can complain to the user if the CPU is insufficient.
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cflags-i386 :=
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cflags-x86_64 := -m32
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CFLAGS := $(LINUXINCLUDE) -g -Os -D_SETUP -D__KERNEL__ \
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$(cflags-$(ARCH)) \
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-Wall -Wstrict-prototypes \
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-march=i386 -mregparm=3 \
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-include $(srctree)/$(src)/code16gcc.h \
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-fno-strict-aliasing -fomit-frame-pointer \
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$(call cc-option, -ffreestanding) \
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$(call cc-option, -fno-toplevel-reorder,\
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$(call cc-option, -fno-unit-at-a-time)) \
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$(call cc-option, -fno-stack-protector) \
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$(call cc-option, -mpreferred-stack-boundary=2)
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AFLAGS := $(CFLAGS) -D__ASSEMBLY__
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$(obj)/zImage: IMAGE_OFFSET := 0x1000
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$(obj)/zImage: EXTRA_AFLAGS := $(SVGA_MODE) $(RAMDISK)
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$(obj)/bzImage: IMAGE_OFFSET := 0x100000
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$(obj)/bzImage: EXTRA_CFLAGS := -D__BIG_KERNEL__
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$(obj)/bzImage: EXTRA_AFLAGS := $(SVGA_MODE) $(RAMDISK) -D__BIG_KERNEL__
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$(obj)/bzImage: BUILDFLAGS := -b
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quiet_cmd_image = BUILD $@
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cmd_image = $(obj)/tools/build $(BUILDFLAGS) $(obj)/bootsect $(obj)/setup \
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cmd_image = $(obj)/tools/build $(BUILDFLAGS) $(obj)/setup.bin \
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$(obj)/vmlinux.bin $(ROOT_DEV) > $@
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$(obj)/zImage $(obj)/bzImage: $(obj)/bootsect $(obj)/setup \
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$(obj)/zImage $(obj)/bzImage: $(obj)/setup.bin \
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$(obj)/vmlinux.bin $(obj)/tools/build FORCE
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$(call if_changed,image)
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@echo 'Kernel: $@ is ready' ' (#'`cat .version`')'
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@ -53,12 +82,17 @@ $(obj)/zImage $(obj)/bzImage: $(obj)/bootsect $(obj)/setup \
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$(obj)/vmlinux.bin: $(obj)/compressed/vmlinux FORCE
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$(call if_changed,objcopy)
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LDFLAGS_bootsect := -Ttext 0x0 -s --oformat binary
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LDFLAGS_setup := -Ttext 0x0 -s --oformat binary -e begtext
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SETUP_OBJS = $(addprefix $(obj)/,$(setup-y))
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$(obj)/setup $(obj)/bootsect: %: %.o FORCE
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LDFLAGS_setup.elf := -T
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$(obj)/setup.elf: $(src)/setup.ld $(SETUP_OBJS) FORCE
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$(call if_changed,ld)
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OBJCOPYFLAGS_setup.bin := -O binary
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$(obj)/setup.bin: $(obj)/setup.elf FORCE
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$(call if_changed,objcopy)
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$(obj)/compressed/vmlinux: FORCE
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$(Q)$(MAKE) $(build)=$(obj)/compressed IMAGE_OFFSET=$(IMAGE_OFFSET) $@
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@ -9,9 +9,14 @@ targets := vmlinux vmlinux.bin vmlinux.bin.gz head.o misc.o piggy.o \
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EXTRA_AFLAGS := -traditional
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LDFLAGS_vmlinux := -T
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CFLAGS_misc.o += -fPIC
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hostprogs-y := relocs
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CFLAGS := -m32 -D__KERNEL__ $(LINUX_INCLUDE) -O2 \
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-fno-strict-aliasing -fPIC \
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$(call cc-option,-ffreestanding) \
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$(call cc-option,-fno-stack-protector)
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LDFLAGS := -m elf_i386
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$(obj)/vmlinux: $(src)/vmlinux.lds $(obj)/head.o $(obj)/misc.o $(obj)/piggy.o FORCE
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$(call if_changed,ld)
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@:
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@ -1,13 +1,12 @@
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/*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1997 Martin Mares
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* Copyright (C) 2007 H. Peter Anvin
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*/
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/*
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* This file builds a disk-image from three different files:
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*
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* - bootsect: compatibility mbr which prints an error message if
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* someone tries to boot the kernel directly.
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* - setup: 8086 machine code, sets up system parm
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* - system: 80386 code for actual system
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*
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@ -21,6 +20,7 @@
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* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
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* Cross compiling fixes by Gertjan van Wingerde, July 1996
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* Rewritten by Martin Mares, April 1997
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* Substantially overhauled by H. Peter Anvin, April 2007
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*/
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#include <stdio.h>
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@ -32,23 +32,25 @@
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#include <sys/sysmacros.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <asm/boot.h>
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typedef unsigned char byte;
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typedef unsigned short word;
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typedef unsigned long u32;
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned long u32;
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#define DEFAULT_MAJOR_ROOT 0
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#define DEFAULT_MINOR_ROOT 0
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/* Minimal number of setup sectors (see also bootsect.S) */
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#define SETUP_SECTS 4
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/* Minimal number of setup sectors */
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#define SETUP_SECT_MIN 5
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#define SETUP_SECT_MAX 64
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byte buf[1024];
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int fd;
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/* This must be large enough to hold the entire setup */
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u8 buf[SETUP_SECT_MAX*512];
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int is_big_kernel;
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void die(const char * str, ...)
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static void die(const char * str, ...)
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{
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va_list args;
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va_start(args, str);
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@ -57,15 +59,9 @@ void die(const char * str, ...)
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exit(1);
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}
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void file_open(const char *name)
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static void usage(void)
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{
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if ((fd = open(name, O_RDONLY, 0)) < 0)
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die("Unable to open `%s': %m", name);
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}
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void usage(void)
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{
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die("Usage: build [-b] bootsect setup system [rootdev] [> image]");
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die("Usage: build [-b] setup system [rootdev] [> image]");
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}
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int main(int argc, char ** argv)
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@ -73,27 +69,30 @@ int main(int argc, char ** argv)
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unsigned int i, sz, setup_sectors;
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int c;
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u32 sys_size;
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byte major_root, minor_root;
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u8 major_root, minor_root;
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struct stat sb;
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FILE *file;
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int fd;
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void *kernel;
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if (argc > 2 && !strcmp(argv[1], "-b"))
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{
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is_big_kernel = 1;
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argc--, argv++;
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}
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if ((argc < 4) || (argc > 5))
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if ((argc < 3) || (argc > 4))
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usage();
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if (argc > 4) {
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if (!strcmp(argv[4], "CURRENT")) {
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if (argc > 3) {
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if (!strcmp(argv[3], "CURRENT")) {
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if (stat("/", &sb)) {
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perror("/");
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die("Couldn't stat /");
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}
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major_root = major(sb.st_dev);
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minor_root = minor(sb.st_dev);
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} else if (strcmp(argv[4], "FLOPPY")) {
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if (stat(argv[4], &sb)) {
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perror(argv[4]);
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} else if (strcmp(argv[3], "FLOPPY")) {
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if (stat(argv[3], &sb)) {
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perror(argv[3]);
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die("Couldn't stat root device.");
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}
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major_root = major(sb.st_rdev);
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@ -108,79 +107,62 @@ int main(int argc, char ** argv)
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}
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fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root);
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file_open(argv[1]);
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i = read(fd, buf, sizeof(buf));
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fprintf(stderr,"Boot sector %d bytes.\n",i);
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if (i != 512)
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die("Boot block must be exactly 512 bytes");
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/* Copy the setup code */
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file = fopen(argv[1], "r");
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if (!file)
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die("Unable to open `%s': %m", argv[1]);
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c = fread(buf, 1, sizeof(buf), file);
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if (ferror(file))
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die("read-error on `setup'");
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if (c < 1024)
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die("The setup must be at least 1024 bytes");
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if (buf[510] != 0x55 || buf[511] != 0xaa)
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die("Boot block hasn't got boot flag (0xAA55)");
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fclose(file);
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/* Pad unused space with zeros */
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setup_sectors = (c + 511) / 512;
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if (setup_sectors < SETUP_SECT_MIN)
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setup_sectors = SETUP_SECT_MIN;
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i = setup_sectors*512;
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memset(buf+c, 0, i-c);
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/* Set the default root device */
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buf[508] = minor_root;
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buf[509] = major_root;
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if (write(1, buf, 512) != 512)
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die("Write call failed");
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close (fd);
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file_open(argv[2]); /* Copy the setup code */
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for (i=0 ; (c=read(fd, buf, sizeof(buf)))>0 ; i+=c )
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if (write(1, buf, c) != c)
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die("Write call failed");
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if (c != 0)
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die("read-error on `setup'");
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close (fd);
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fprintf(stderr, "Setup is %d bytes (padded to %d bytes).\n", c, i);
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setup_sectors = (i + 511) / 512; /* Pad unused space with zeros */
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/* for compatibility with ancient versions of LILO. */
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if (setup_sectors < SETUP_SECTS)
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setup_sectors = SETUP_SECTS;
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fprintf(stderr, "Setup is %d bytes.\n", i);
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memset(buf, 0, sizeof(buf));
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while (i < setup_sectors * 512) {
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c = setup_sectors * 512 - i;
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if (c > sizeof(buf))
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c = sizeof(buf);
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if (write(1, buf, c) != c)
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die("Write call failed");
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i += c;
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}
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file_open(argv[3]);
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if (fstat (fd, &sb))
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die("Unable to stat `%s': %m", argv[3]);
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/* Open and stat the kernel file */
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fd = open(argv[2], O_RDONLY);
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if (fd < 0)
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die("Unable to open `%s': %m", argv[2]);
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if (fstat(fd, &sb))
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die("Unable to stat `%s': %m", argv[2]);
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sz = sb.st_size;
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fprintf (stderr, "System is %d kB\n", sz/1024);
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fprintf (stderr, "System is %d kB\n", (sz+1023)/1024);
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kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0);
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if (kernel == MAP_FAILED)
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die("Unable to mmap '%s': %m", argv[2]);
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sys_size = (sz + 15) / 16;
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if (!is_big_kernel && sys_size > DEF_SYSSIZE)
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die("System is too big. Try using bzImage or modules.");
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while (sz > 0) {
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int l, n;
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l = (sz > sizeof(buf)) ? sizeof(buf) : sz;
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if ((n=read(fd, buf, l)) != l) {
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if (n < 0)
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die("Error reading %s: %m", argv[3]);
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else
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die("%s: Unexpected EOF", argv[3]);
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}
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if (write(1, buf, l) != l)
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die("Write failed");
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sz -= l;
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}
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/* Patch the setup code with the appropriate size parameters */
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buf[0x1f1] = setup_sectors-1;
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buf[0x1f4] = sys_size;
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buf[0x1f5] = sys_size >> 8;
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buf[0x1f6] = sys_size >> 16;
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buf[0x1f7] = sys_size >> 24;
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if (fwrite(buf, 1, i, stdout) != i)
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die("Writing setup failed");
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/* Copy the kernel code */
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if (fwrite(kernel, 1, sz, stdout) != sz)
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die("Writing kernel failed");
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close(fd);
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if (lseek(1, 497, SEEK_SET) != 497) /* Write sizes to the bootsector */
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die("Output: seek failed");
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buf[0] = setup_sectors;
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if (write(1, buf, 1) != 1)
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die("Write of setup sector count failed");
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if (lseek(1, 500, SEEK_SET) != 500)
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die("Output: seek failed");
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buf[0] = (sys_size & 0xff);
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buf[1] = ((sys_size >> 8) & 0xff);
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buf[2] = ((sys_size >> 16) & 0xff);
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buf[3] = ((sys_size >> 24) & 0xff);
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if (write(1, buf, 4) != 4)
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die("Write of image length failed");
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return 0; /* Everything is OK */
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/* Everything is OK */
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return 0;
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}
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