From: "Jan Beulich" <JBeulich@suse.com>
To: Daniel Kiper <daniel.kiper@oracle.com>
Cc: Juergen Gross <JGross@suse.com>,
stefano.stabellini@eu.citrix.com, andrew.cooper3@citrix.com,
cardoe@cardoe.com, pgnet.dev@gmail.com, ning.sun@intel.com,
david.vrabel@citrix.com, xen-devel@lists.xenproject.org,
qiaowei.ren@intel.com, richard.l.maliszewski@intel.com,
gang.wei@intel.com, fu.wei@linaro.org
Subject: Re: [PATCH v3 08/16] x86: add multiboot2 protocol support
Date: Fri, 27 May 2016 02:11:01 -0600 [thread overview]
Message-ID: <57481D3502000078000EF106@prv-mh.provo.novell.com> (raw)
In-Reply-To: <20160525163441.GK5490@olila.local.net-space.pl>
>>> On 25.05.16 at 18:34, <daniel.kiper@oracle.com> wrote:
> On Tue, May 24, 2016 at 09:46:13AM -0600, Jan Beulich wrote:
>> >>> On 15.04.16 at 14:33, <daniel.kiper@oracle.com> wrote:
>> > @@ -19,6 +20,28 @@
>> > #define BOOT_PSEUDORM_CS 0x0020
>> > #define BOOT_PSEUDORM_DS 0x0028
>> >
>> > +#define MB2_HT(name) (MULTIBOOT2_HEADER_TAG_##name)
>> > +#define MB2_TT(name) (MULTIBOOT2_TAG_TYPE_##name)
>> > +
>> > + .macro mb2ht_args arg, args:vararg
>> > + .long \arg
>> > + .ifnb \args
>> > + mb2ht_args \args
>> > + .endif
>> > + .endm
>> > +
>> > + .macro mb2ht_init type, req, args:vararg
>>
>> If you already use :vararg here and above, please also use :req on
>> the other macro arguments.
>
> Why?
Because they're not allowed to be blank, yet it looks like if they
are left blank no error would otherwise be reported by gas?
>> > @@ -34,6 +57,42 @@ multiboot1_header_start: /*** MULTIBOOT1 HEADER ****/
>> > .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
>> > multiboot1_header_end:
>> >
>> > +/*** MULTIBOOT2 HEADER ****/
>> > +/* Some ideas are taken from grub-2.00/grub-core/tests/boot/kernel-i386.S file. */
>> > + .align MULTIBOOT2_HEADER_ALIGN
>> > +
>> > +multiboot2_header_start:
>> > + /* Magic number indicating a Multiboot2 header. */
>> > + .long MULTIBOOT2_HEADER_MAGIC
>> > + /* Architecture: i386. */
>> > + .long MULTIBOOT2_ARCHITECTURE_I386
>> > + /* Multiboot2 header length. */
>> > + .long multiboot2_header_end - multiboot2_header_start
>> > + /* Multiboot2 header checksum. */
>> > + .long -(MULTIBOOT2_HEADER_MAGIC + MULTIBOOT2_ARCHITECTURE_I386 + \
>> > + (multiboot2_header_end - multiboot2_header_start))
>> > +
>> > + /* Multiboot2 information request tag. */
>> > + mb2ht_init MB2_HT(INFORMATION_REQUEST), MB2_HT(REQUIRED), \
>> > + MB2_TT(BASIC_MEMINFO), MB2_TT(MMAP)
>> > +
>> > + /* Align modules at page boundry. */
>> > + mb2ht_init MB2_HT(MODULE_ALIGN), MB2_HT(REQUIRED)
>> > +
>> > + /* Console flags tag. */
>> > + mb2ht_init MB2_HT(CONSOLE_FLAGS), MB2_HT(OPTIONAL), \
>> > + MULTIBOOT2_CONSOLE_FLAGS_EGA_TEXT_SUPPORTED
>> > +
>> > + /* Framebuffer tag. */
>> > + mb2ht_init MB2_HT(FRAMEBUFFER), MB2_HT(OPTIONAL), \
>> > + 0, /* Number of the columns - no preference. */ \
>> > + 0, /* Number of the lines - no preference. */ \
>> > + 0 /* Number of bits per pixel - no preference. */
>> > +
>> > + /* Multiboot2 header end tag. */
>> > + mb2ht_init MB2_HT(END), MB2_HT(REQUIRED)
>> > +multiboot2_header_end:
>>
>> Imo "end" labels should always preferably be .L-prefixed, to avoid
>> them getting used by a consumer instead of another "proper" label
>> starting whatever comes next.
>
> Make sense, however, I am in line with multiboot1_header_end label here.
> So, if we wish .L here then we should change multiboot1_header_end label
> above too. Of course in separate patch.
Sure. My main point (as always) is that stuff that's there without a
good reason shouldn't be cloned. At least the clone should be done
right from the beginning. Cleaning up existing code is appreciated,
but secondary.
Jan
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next prev parent reply other threads:[~2016-05-27 8:11 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-15 12:33 [PATCH v3 00/16] x86: multiboot2 protocol support Daniel Kiper
2016-04-15 12:33 ` [PATCH v3 01/16] x86/boot: do not create unwind tables Daniel Kiper
2016-04-15 15:45 ` Andrew Cooper
2016-04-15 12:33 ` [PATCH v3 02/16] x86: zero BSS using stosl instead of stosb Daniel Kiper
2016-04-15 13:57 ` Konrad Rzeszutek Wilk
2016-04-15 15:48 ` Andrew Cooper
2016-04-15 12:33 ` [PATCH v3 03/16] x86/boot: call reloc() using cdecl calling convention Daniel Kiper
2016-04-15 15:56 ` Andrew Cooper
2016-06-17 8:41 ` Daniel Kiper
2016-06-17 9:30 ` Jan Beulich
2016-05-24 8:42 ` Jan Beulich
2016-04-15 12:33 ` [PATCH v3 04/16] x86/boot/reloc: create generic alloc and copy functions Daniel Kiper
2016-04-15 12:33 ` [PATCH v3 05/16] x86/boot: use %ecx instead of %eax Daniel Kiper
2016-04-15 12:33 ` [PATCH v3 06/16] x86/boot/reloc: Rename some variables and rearrange code a bit Daniel Kiper
2016-04-15 12:33 ` [PATCH v3 07/16] x86/boot: create *.lnk files with linker script Daniel Kiper
2016-04-15 14:04 ` Konrad Rzeszutek Wilk
2016-05-24 9:05 ` Jan Beulich
2016-05-24 12:28 ` Daniel Kiper
2016-05-24 12:52 ` Jan Beulich
2016-06-17 9:06 ` Daniel Kiper
2016-06-17 10:04 ` Jan Beulich
2016-06-17 10:34 ` Daniel Kiper
2016-04-15 12:33 ` [PATCH v3 08/16] x86: add multiboot2 protocol support Daniel Kiper
2016-05-24 15:46 ` Jan Beulich
2016-05-25 16:34 ` Daniel Kiper
2016-05-26 10:28 ` Andrew Cooper
2016-05-27 8:08 ` Jan Beulich
2016-05-27 8:13 ` Andrew Cooper
2016-05-27 8:24 ` Jan Beulich
2016-05-27 8:11 ` Jan Beulich [this message]
2016-04-15 12:33 ` [PATCH v3 09/16] efi: explicitly define efi struct in xen/arch/x86/efi/stub.c Daniel Kiper
2016-05-25 7:03 ` Jan Beulich
2016-05-25 16:45 ` Daniel Kiper
2016-05-27 8:16 ` Jan Beulich
2016-06-01 15:07 ` Daniel Kiper
2016-07-05 18:33 ` Daniel Kiper
2016-07-06 6:55 ` Jan Beulich
2016-07-06 10:27 ` Daniel Kiper
2016-07-06 12:00 ` Jan Beulich
2016-07-06 12:55 ` Daniel Kiper
2016-04-15 12:33 ` [PATCH v3 10/16] efi: create efi_enabled() Daniel Kiper
2016-05-25 7:20 ` Jan Beulich
2016-05-25 17:15 ` Daniel Kiper
2016-05-26 10:31 ` Andrew Cooper
2016-05-27 8:22 ` Jan Beulich
2016-06-01 15:23 ` Daniel Kiper
2016-06-01 15:41 ` Jan Beulich
2016-06-01 19:28 ` Daniel Kiper
2016-06-02 8:06 ` Jan Beulich
2016-04-15 12:33 ` [PATCH v3 11/16] efi: build xen.gz with EFI code Daniel Kiper
2016-05-25 7:53 ` Jan Beulich
2016-05-25 19:07 ` Daniel Kiper
2016-05-27 8:31 ` Jan Beulich
2016-06-01 15:48 ` Daniel Kiper
2016-06-01 15:58 ` Jan Beulich
2016-06-01 19:39 ` Daniel Kiper
2016-04-15 12:33 ` [PATCH v3 12/16 - RFC] x86/efi: create new early memory allocator Daniel Kiper
2016-05-25 8:39 ` Jan Beulich
2016-05-25 19:48 ` Daniel Kiper
2016-05-27 8:37 ` Jan Beulich
2016-06-01 15:58 ` Daniel Kiper
2016-06-01 16:02 ` Jan Beulich
2016-06-01 19:53 ` Daniel Kiper
2016-06-02 8:11 ` Jan Beulich
2016-06-02 10:43 ` Daniel Kiper
2016-06-02 11:10 ` Jan Beulich
2016-06-01 16:01 ` Daniel Kiper
2016-07-05 18:26 ` Daniel Kiper
2016-07-06 7:22 ` Jan Beulich
2016-07-06 11:15 ` Daniel Kiper
2016-04-15 12:33 ` [PATCH v3 13/16 - RFC] x86: add multiboot2 protocol support for EFI platforms Daniel Kiper
2016-05-25 9:32 ` Jan Beulich
2016-05-25 10:29 ` Jan Beulich
2016-05-25 21:02 ` Daniel Kiper
2016-05-27 9:02 ` Jan Beulich
2016-06-01 19:03 ` Daniel Kiper
2016-06-02 8:34 ` Jan Beulich
2016-06-02 16:12 ` Daniel Kiper
2016-06-03 9:26 ` Jan Beulich
2016-06-03 17:06 ` Konrad Rzeszutek Wilk
2016-04-15 12:33 ` [PATCH v3 14/16] x86/boot: implement early command line parser in C Daniel Kiper
2016-05-25 10:33 ` Jan Beulich
2016-05-25 21:36 ` Daniel Kiper
2016-05-27 9:33 ` Jan Beulich
2016-06-02 8:15 ` Daniel Kiper
2016-06-02 8:39 ` Jan Beulich
2016-04-15 12:33 ` [PATCH v3 15/16 - RFC] x86: make Xen early boot code relocatable Daniel Kiper
2016-05-25 10:48 ` Jan Beulich
2016-04-15 12:33 ` [PATCH v3 16/16] x86: add multiboot2 protocol support for relocatable images Daniel Kiper
2016-05-25 11:03 ` Jan Beulich
2016-06-01 13:35 ` Daniel Kiper
2016-06-01 14:44 ` Jan Beulich
2016-06-01 19:16 ` Daniel Kiper
2016-06-02 8:41 ` Jan Beulich
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