kernel.git/arch/x86/boot, branch linux-2.6.37.y

x86-32: Make sure we can map all of lowmem if we need to

2010-12-17T03:11:09Z

A relocatable kernel can be anywhere in lowmem -- and in the case of a kdump kernel, is likely to be fairly high. Since the early page tables map everything from address zero up we need to make sure we allocate enough brk that we can map all of lowmem if we need to. Reported-by: Stanislaw Gruszka Signed-off-by: H. Peter Anvin Tested-by: Yinghai Lu LKML-Reference: <4D0AD3ED.8070607@kernel.org>

x86, setup: Use string copy operation to optimze copy in kernel compression

2010-10-08T04:23:09Z

The kernel decompression code parses the ELF header and then copies the segment to the corresponding destination. Currently it uses slow byte-copy code. This patch makes it use the string copy operations instead. In the test the copy performance can be improved very significantly after using the string copy operation mechanism. 1. The copy time can be reduced from 150ms to 20ms on one Atom machine 2. The copy time can be reduced about 80% on another machine The time is reduced from 7ms to 1.5ms when using 32-bit kernel. The time is reduced from 10ms to 2ms when using 64-bit kernel. Signed-off-by: Zhao Yakui LKML-Reference: <1286502453-7043-1-git-send-email-yakui.zhao@intel.com> Signed-off-by: H. Peter Anvin

x86, setup: Fix earlyprintk=serial,0x3f8,115200

2010-09-21T17:18:33Z

earlyprintk can take and I/O port, so we need to handle this case in the setup code too, otherwise 0x3f8 will be treated as a baud rate. Signed-off-by: Yinghai Lu LKML-Reference: <4C7B05A6.4010801@kernel.org> Signed-off-by: H. Peter Anvin

x86, setup: Fix earlyprintk=serial,ttyS0,115200

2010-09-21T17:18:14Z

Torsten reported that there is garbage output, after commit 8fee13a48e4879fba57725f6d9513df4bfa8e9f3 (x86, setup: enable early console output from the decompressor) It turns out we missed the offset for that case. Reported-by: Torsten Kaiser Signed-off-by: Yinghai Lu LKML-Reference: <4C7B0578.8090807@kernel.org> Signed-off-by: H. Peter Anvin

x86, setup: move isdigit.h to ctype.h, header files on top.

2010-08-03T04:07:20Z

It is a subset of functionality, so name it ctype.h. Also, reorganize header files so #include statements are clustered near the top as they should be. Signed-off-by: H. Peter Anvin LKML-Reference: <4C5752F2.8030206@kernel.org>

x86, setup: enable early console output from the decompressor

2010-08-03T03:32:20Z

This enables the decompressor output to be seen on the serial console. Most of the code is shared with the regular boot code. We could add printf to the decompressor if needed, but currently there is no sufficiently compelling user. -v2: define BOOT_BOOT_H to avoid include boot.h -v3: early_serial_base need to be static in misc.c ? -v4: create seperate string.c printf.c cmdline.c early_serial_console.c after hpa's patch that allow global variables in compressed/misc stage -v5: remove printf.c related Signed-off-by: Yinghai Lu Signed-off-by: H. Peter Anvin

x86, setup: reorganize the early console setup

2010-08-02T22:51:56Z

Separate early_serial_console from tty.c This allows for reuse of early_serial_console.c/string.c/printf.c/cmdline.c in boot/compressed/. -v2: according to hpa, don't include string.c etc -v3: compressed/misc.c must have early_serial_base as static, so move it back to tty.c for setup code Signed-off-by: Yinghai Lu LKML-Reference: <4C568D2B.205@kernel.org> Signed-off-by: H. Peter Anvin

x86, setup: Allow global variables and functions in the decompressor

2010-08-02T22:34:44Z

In order for global variables and functions to work in the decompressor, we need to fix up the GOT in assembly code. Signed-off-by: H. Peter Anvin LKML-Reference: <4C57382E.8050501@zytor.com>

x86, setup: Only set early_serial_base after port is initialized

2010-07-14T19:07:16Z

putchar is using early_serial_base to check if port is initialized. So we only assign it after early_serial_init() is called, in case we need use VGA to debug early serial console. Also add display for port addr and baud. -v2: update to current tip Acked-by: Pekka Enberg Signed-off-by: Yinghai Lu LKML-Reference: <4C3E0171.6050008@kernel.org> Signed-off-by: H. Peter Anvin

x86, setup: Make the setup code also accept console=uart8250

2010-07-13T21:08:12Z

Make the boot code also accept the console=uart8250,io,0x2f8,115200n form of early console. Also add back simple_guess_base(), otherwise those simple_strtoull(,,0) are not going to work. Signed-off-by: Yinghai Lu LKML-Reference: <4C3CCE05.4090505@kernel.org> Acked-by: Pekka Enberg Signed-off-by: H. Peter Anvin