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Mon, 12 Sep 2016 13:21:48 -0700 From: Daniel Kiper To: xen-devel@lists.xenproject.org Date: Mon, 12 Sep 2016 22:18:30 +0200 Message-Id: <1473711511-11931-16-git-send-email-daniel.kiper@oracle.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1473711511-11931-1-git-send-email-daniel.kiper@oracle.com> References: <1473711511-11931-1-git-send-email-daniel.kiper@oracle.com> X-Source-IP: userv0022.oracle.com [156.151.31.74] Cc: jgross@suse.com, sstabellini@kernel.org, andrew.cooper3@citrix.com, cardoe@cardoe.com, pgnet.dev@gmail.com, ning.sun@intel.com, david.vrabel@citrix.com, jbeulich@suse.com, qiaowei.ren@intel.com, gang.wei@intel.com, fu.wei@linaro.org Subject: [Xen-devel] [PATCH v6 15/15] x86: add multiboot2 protocol support for relocatable images X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP Add multiboot2 protocol support for relocatable images. Only GRUB2 with "multiboot2: Add support for relocatable images" patch understands that feature. Older multiboot protocol (regardless of version) compatible loaders ignore it and everything works as usual. Signed-off-by: Daniel Kiper --- v4 - suggestions/fixes: - do not get Xen image load base address from multiboot2 information in x86_64 code (suggested by Jan Beulich), - improve label names (suggested by Jan Beulich), - improve comments, (suggested by Jan Beulich). v3 - suggestions/fixes: - use %esi and %r15d instead of %ebp to store Xen image load base address, - rename some types and constants, - reformat xen/include/xen/multiboot2.h (suggested by Konrad Rzeszutek Wilk), - improve comments, - improve commit message (suggested by Konrad Rzeszutek Wilk). --- xen/arch/x86/boot/head.S | 19 ++++++++++++++++++- xen/arch/x86/x86_64/asm-offsets.c | 1 + xen/include/xen/multiboot2.h | 13 +++++++++++++ 3 files changed, 32 insertions(+), 1 deletion(-) diff --git a/xen/arch/x86/boot/head.S b/xen/arch/x86/boot/head.S index bb2163a..9761d30 100644 --- a/xen/arch/x86/boot/head.S +++ b/xen/arch/x86/boot/head.S @@ -82,6 +82,13 @@ multiboot2_header_start: /* Align modules at page boundry. */ mb2ht_init MB2_HT(MODULE_ALIGN), MB2_HT(REQUIRED) + /* Load address preference. */ + mb2ht_init MB2_HT(RELOCATABLE), MB2_HT(OPTIONAL), \ + sym_offs(start), /* Min load address. */ \ + 0xffffffff, /* The end of image max load address (4 GiB - 1). */ \ + 0x200000, /* Load address alignment (2 MiB). */ \ + MULTIBOOT2_LOAD_PREFERENCE_HIGH + /* Console flags tag. */ mb2ht_init MB2_HT(CONSOLE_FLAGS), MB2_HT(OPTIONAL), \ MULTIBOOT2_CONSOLE_FLAGS_EGA_TEXT_SUPPORTED @@ -382,10 +389,19 @@ __start: cmp %edi,MB2_fixed_total_size(%ebx) jbe trampoline_bios_setup + /* Get Xen image load base address from Multiboot2 information. */ + cmpl $MULTIBOOT2_TAG_TYPE_LOAD_BASE_ADDR,MB2_tag_type(%ecx) + jne 1f + + mov MB2_load_base_addr(%ecx),%esi + sub $XEN_IMG_OFFSET,%esi + jmp 9f + +1: /* Get mem_lower from Multiboot2 information. */ cmpl $MULTIBOOT2_TAG_TYPE_BASIC_MEMINFO,MB2_tag_type(%ecx) cmove MB2_mem_lower(%ecx),%edx - je trampoline_bios_setup + je 9f /* EFI IA-32 platforms are not supported. */ cmpl $MULTIBOOT2_TAG_TYPE_EFI32,MB2_tag_type(%ecx) @@ -399,6 +415,7 @@ __start: cmpl $MULTIBOOT2_TAG_TYPE_END,MB2_tag_type(%ecx) je trampoline_bios_setup +9: /* Go to next Multiboot2 information tag. */ add MB2_tag_size(%ecx),%ecx add $(MULTIBOOT2_TAG_ALIGN-1),%ecx diff --git a/xen/arch/x86/x86_64/asm-offsets.c b/xen/arch/x86/x86_64/asm-offsets.c index 5d7a8e5..beac5ca 100644 --- a/xen/arch/x86/x86_64/asm-offsets.c +++ b/xen/arch/x86/x86_64/asm-offsets.c @@ -174,6 +174,7 @@ void __dummy__(void) OFFSET(MB2_fixed_total_size, multiboot2_fixed_t, total_size); OFFSET(MB2_tag_type, multiboot2_tag_t, type); OFFSET(MB2_tag_size, multiboot2_tag_t, size); + OFFSET(MB2_load_base_addr, multiboot2_tag_load_base_addr_t, load_base_addr); OFFSET(MB2_mem_lower, multiboot2_tag_basic_meminfo_t, mem_lower); OFFSET(MB2_efi64_st, multiboot2_tag_efi64_t, pointer); OFFSET(MB2_efi64_ih, multiboot2_tag_efi64_ih_t, pointer); diff --git a/xen/include/xen/multiboot2.h b/xen/include/xen/multiboot2.h index 8dd5800..feb4297 100644 --- a/xen/include/xen/multiboot2.h +++ b/xen/include/xen/multiboot2.h @@ -59,11 +59,17 @@ #define MULTIBOOT2_HEADER_TAG_EFI_BS 7 #define MULTIBOOT2_HEADER_TAG_ENTRY_ADDRESS_EFI32 8 #define MULTIBOOT2_HEADER_TAG_ENTRY_ADDRESS_EFI64 9 +#define MULTIBOOT2_HEADER_TAG_RELOCATABLE 10 /* Header tag flags. */ #define MULTIBOOT2_HEADER_TAG_REQUIRED 0 #define MULTIBOOT2_HEADER_TAG_OPTIONAL 1 +/* Where image should be loaded (suggestion not requirement). */ +#define MULTIBOOT2_LOAD_PREFERENCE_NONE 0 +#define MULTIBOOT2_LOAD_PREFERENCE_LOW 1 +#define MULTIBOOT2_LOAD_PREFERENCE_HIGH 2 + /* Header console tag console_flags. */ #define MULTIBOOT2_CONSOLE_FLAGS_CONSOLE_REQUIRED 1 #define MULTIBOOT2_CONSOLE_FLAGS_EGA_TEXT_SUPPORTED 2 @@ -90,6 +96,7 @@ #define MULTIBOOT2_TAG_TYPE_EFI_BS 18 #define MULTIBOOT2_TAG_TYPE_EFI32_IH 19 #define MULTIBOOT2_TAG_TYPE_EFI64_IH 20 +#define MULTIBOOT2_TAG_TYPE_LOAD_BASE_ADDR 21 /* Multiboot 2 tag alignment. */ #define MULTIBOOT2_TAG_ALIGN 8 @@ -120,6 +127,12 @@ typedef struct { typedef struct { u32 type; u32 size; + u32 load_base_addr; +} multiboot2_tag_load_base_addr_t; + +typedef struct { + u32 type; + u32 size; char string[]; } multiboot2_tag_string_t;