x86: remove zImage support
Impact: obsolete feature removal The zImage kernel format has been functionally unused for a very long time. It is just barely possible to build a modern kernel that still fits within the zImage size limit, but it is highly unlikely that anyone ever uses it. Furthermore, although it is still supported by most bootloaders, it has been at best poorly tested (or not tested at all); some bootloaders are even known to not support zImage at all and not having even noticed. Also remove some really obsolete constants that no longer have any meaning. LKML-Reference: <49B703D4.1000008@zytor.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin
parent
78b020d035
commit
5e47c478b0
5 changed files with 18 additions and 91 deletions
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@ -6,26 +6,23 @@
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# for more details.
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#
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# Copyright (C) 1994 by Linus Torvalds
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# Changed by many, many contributors over the years.
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#
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# ROOT_DEV specifies the default root-device when making the image.
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# This can be either FLOPPY, CURRENT, /dev/xxxx or empty, in which case
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# the default of FLOPPY is used by 'build'.
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ROOT_DEV := CURRENT
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ROOT_DEV := CURRENT
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# If you want to preset the SVGA mode, uncomment the next line and
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# set SVGA_MODE to whatever number you want.
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# Set it to -DSVGA_MODE=NORMAL_VGA if you just want the EGA/VGA mode.
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# The number is the same as you would ordinarily press at bootup.
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SVGA_MODE := -DSVGA_MODE=NORMAL_VGA
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SVGA_MODE := -DSVGA_MODE=NORMAL_VGA
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# If you want the RAM disk device, define this to be the size in blocks.
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#RAMDISK := -DRAMDISK=512
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targets := vmlinux.bin setup.bin setup.elf zImage bzImage
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targets := vmlinux.bin setup.bin setup.elf bzImage
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subdir- := compressed
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setup-y += a20.o cmdline.o copy.o cpu.o cpucheck.o edd.o
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@ -71,17 +68,13 @@ KBUILD_CFLAGS := $(LINUXINCLUDE) -g -Os -D_SETUP -D__KERNEL__ \
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KBUILD_CFLAGS += $(call cc-option,-m32)
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KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__
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$(obj)/zImage: asflags-y := $(SVGA_MODE) $(RAMDISK)
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$(obj)/bzImage: ccflags-y := -D__BIG_KERNEL__
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$(obj)/bzImage: asflags-y := $(SVGA_MODE) $(RAMDISK) -D__BIG_KERNEL__
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$(obj)/bzImage: BUILDFLAGS := -b
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$(obj)/bzImage: asflags-y := $(SVGA_MODE)
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quiet_cmd_image = BUILD $@
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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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cmd_image = $(obj)/tools/build $(obj)/setup.bin $(obj)/vmlinux.bin \
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$(ROOT_DEV) > $@
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$(obj)/zImage $(obj)/bzImage: $(obj)/setup.bin \
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$(obj)/vmlinux.bin $(obj)/tools/build FORCE
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$(obj)/bzImage: $(obj)/setup.bin $(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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@ -24,12 +24,8 @@
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#include "boot.h"
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#include "offsets.h"
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SETUPSECTS = 4 /* default nr of setup-sectors */
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BOOTSEG = 0x07C0 /* original address of boot-sector */
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SYSSEG = DEF_SYSSEG /* system loaded at 0x10000 (65536) */
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SYSSIZE = DEF_SYSSIZE /* system size: # of 16-byte clicks */
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/* to be loaded */
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ROOT_DEV = 0 /* ROOT_DEV is now written by "build" */
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SYSSEG = 0x1000 /* historical load address >> 4 */
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#ifndef SVGA_MODE
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#define SVGA_MODE ASK_VGA
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@ -97,12 +93,12 @@ bugger_off_msg:
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.section ".header", "a"
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.globl hdr
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hdr:
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setup_sects: .byte SETUPSECTS
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setup_sects: .byte 0 /* Filled in by build.c */
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root_flags: .word ROOT_RDONLY
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syssize: .long SYSSIZE
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ram_size: .word RAMDISK
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syssize: .long 0 /* Filled in by build.c */
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ram_size: .word 0 /* Obsolete */
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vid_mode: .word SVGA_MODE
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root_dev: .word ROOT_DEV
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root_dev: .word 0 /* Filled in by build.c */
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boot_flag: .word 0xAA55
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# offset 512, entry point
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@ -123,14 +119,15 @@ _start:
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# or else old loadlin-1.5 will fail)
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.globl realmode_swtch
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realmode_swtch: .word 0, 0 # default_switch, SETUPSEG
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start_sys_seg: .word SYSSEG
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start_sys_seg: .word SYSSEG # obsolete and meaningless, but just
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# in case something decided to "use" it
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.word kernel_version-512 # pointing to kernel version string
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# above section of header is compatible
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# with loadlin-1.5 (header v1.5). Don't
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# change it.
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type_of_loader: .byte 0 # = 0, old one (LILO, Loadlin,
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# Bootlin, SYSLX, bootsect...)
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type_of_loader: .byte 0 # 0 means ancient bootloader, newer
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# bootloaders know to change this.
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# See Documentation/i386/boot.txt for
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# assigned ids
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@ -142,11 +139,7 @@ CAN_USE_HEAP = 0x80 # If set, the loader also has set
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# space behind setup.S can be used for
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# heap purposes.
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# Only the loader knows what is free
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#ifndef __BIG_KERNEL__
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.byte 0
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#else
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.byte LOADED_HIGH
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#endif
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setup_move_size: .word 0x8000 # size to move, when setup is not
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# loaded at 0x90000. We will move setup
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@ -157,11 +150,7 @@ setup_move_size: .word 0x8000 # size to move, when setup is not
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code32_start: # here loaders can put a different
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# start address for 32-bit code.
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#ifndef __BIG_KERNEL__
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.long 0x1000 # 0x1000 = default for zImage
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#else
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.long 0x100000 # 0x100000 = default for big kernel
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#endif
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ramdisk_image: .long 0 # address of loaded ramdisk image
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# Here the loader puts the 32-bit
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@ -32,47 +32,6 @@ static void realmode_switch_hook(void)
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}
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}
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/*
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* A zImage kernel is loaded at 0x10000 but wants to run at 0x1000.
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* A bzImage kernel is loaded and runs at 0x100000.
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*/
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static void move_kernel_around(void)
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{
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/* Note: rely on the compile-time option here rather than
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the LOADED_HIGH flag. The Qemu kernel loader unconditionally
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sets the loadflags to zero. */
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#ifndef __BIG_KERNEL__
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u16 dst_seg, src_seg;
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u32 syssize;
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dst_seg = 0x1000 >> 4;
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src_seg = 0x10000 >> 4;
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syssize = boot_params.hdr.syssize; /* Size in 16-byte paragraphs */
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while (syssize) {
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int paras = (syssize >= 0x1000) ? 0x1000 : syssize;
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int dwords = paras << 2;
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asm volatile("pushw %%es ; "
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"pushw %%ds ; "
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"movw %1,%%es ; "
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"movw %2,%%ds ; "
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"xorw %%di,%%di ; "
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"xorw %%si,%%si ; "
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"rep;movsl ; "
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"popw %%ds ; "
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"popw %%es"
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: "+c" (dwords)
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: "r" (dst_seg), "r" (src_seg)
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: "esi", "edi");
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syssize -= paras;
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dst_seg += paras;
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src_seg += paras;
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}
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#endif
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}
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/*
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* Disable all interrupts at the legacy PIC.
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*/
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@ -147,9 +106,6 @@ void go_to_protected_mode(void)
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/* Hook before leaving real mode, also disables interrupts */
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realmode_switch_hook();
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/* Move the kernel/setup to their final resting places */
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move_kernel_around();
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/* Enable the A20 gate */
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if (enable_a20()) {
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puts("A20 gate not responding, unable to boot...\n");
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@ -130,7 +130,7 @@ static void die(const char * str, ...)
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static void usage(void)
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{
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die("Usage: build [-b] setup system [rootdev] [> image]");
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die("Usage: build setup system [rootdev] [> image]");
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}
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int main(int argc, char ** argv)
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@ -145,11 +145,6 @@ int main(int argc, char ** argv)
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void *kernel;
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u32 crc = 0xffffffffUL;
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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 < 3) || (argc > 4))
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usage();
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if (argc > 3) {
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@ -216,8 +211,6 @@ int main(int argc, char ** argv)
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die("Unable to mmap '%s': %m", argv[2]);
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/* Number of 16-byte paragraphs, including space for a 4-byte CRC */
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sys_size = (sz + 15 + 4) / 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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/* Patch the setup code with the appropriate size parameters */
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buf[0x1f1] = setup_sectors-1;
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@ -1,10 +1,6 @@
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#ifndef _ASM_X86_BOOT_H
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#define _ASM_X86_BOOT_H
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/* Don't touch these, unless you really know what you're doing. */
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#define DEF_SYSSEG 0x1000
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#define DEF_SYSSIZE 0x7F00
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/* Internal svga startup constants */
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#define NORMAL_VGA 0xffff /* 80x25 mode */
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#define EXTENDED_VGA 0xfffe /* 80x50 mode */
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