Re: [PATCH -v3 2/2] x86: more early console output from compressed/misc.c
From: H. Peter Anvin
Date: Mon Aug 02 2010 - 16:39:24 EST
On 08/02/2010 12:35 PM, Yinghai Lu wrote:
> it seems I can not global variables in arch/x86/boot/compressed/misc.c
Well, that should be fixed, then. If we can't use the linker for what
it's supposed to be used for it's just crap.
> and misc.c already include some decompress .c like
> #ifdef CONFIG_KERNEL_GZIP
> #include "../../../../lib/decompress_inflate.c"
> #ifdef CONFIG_KERNEL_BZIP2
> #include "../../../../lib/decompress_bunzip2.c"
> #ifdef CONFIG_KERNEL_LZMA
> #include "../../../../lib/decompress_unlzma.c"
> #ifdef CONFIG_KERNEL_LZO
> #include "../../../../lib/decompress_unlzo.c"
Yes, I know; that's crap in a lot of ways too... the whole decompression
stuff is its own issue which is slowly being addressed. It's not an
excuse to make the code crappier than it already is.
> this patch change to misc.c are following lines:
> #define BOOT_BOOT_H
> #include "../isdigit.h"
> #include "../string.c"
> #include "../printf.c"
> static unsigned long fs;
> static inline void set_fs(unsigned long seg)
> fs = seg << 4; /* shift it back */
> typedef unsigned long addr_t;
> static inline char rdfs8(addr_t addr)
> return *((char *)(fs + addr));
> #include "../cmdline.c"
> static inline int cmdline_find_option(const char *option, char *buffer, int bufsize)
> return __cmdline_find_option(real_mode->hdr.cmd_line_ptr, option, buffer, bufsize);
> static inline int cmdline_find_option_bool(const char *option)
> return __cmdline_find_option_bool(real_mode->hdr.cmd_line_ptr, option);
> static int early_serial_base;
> #include "../early_serial_console.c"
> or put them in another file?
Hmf... games with set_fs() aren't a whole lot of fun at all. I think it
would be better to define some wrappers specific to cmdline.c which
allow it to be using a real pointer in 32-bit mode.
I'll see if I can muck with it, it shouldn't take long.
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