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Tue, 14 Feb 2017 10:34:18 -0800 From: Daniel Kiper To: xen-devel@lists.xenproject.org Date: Tue, 14 Feb 2017 19:33:24 +0100 Message-Id: <1487097209-19552-6-git-send-email-daniel.kiper@oracle.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1487097209-19552-1-git-send-email-daniel.kiper@oracle.com> References: <1487097209-19552-1-git-send-email-daniel.kiper@oracle.com> MIME-Version: 1.0 X-Source-IP: userv0021.oracle.com [156.151.31.71] Cc: jgross@suse.com, sstabellini@kernel.org, andrew.cooper3@citrix.com, cardoe@cardoe.com, pgnet.dev@gmail.com, ning.sun@intel.com, julien.grall@arm.com, jbeulich@suse.com, qiaowei.ren@intel.com, gang.wei@intel.com, fu.wei@linaro.org Subject: [Xen-devel] [PATCH v15 05/10] x86: add multiboot2 protocol support for EFI platforms 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: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP This way Xen can be loaded on EFI platforms using GRUB2 and other boot loaders which support multiboot2 protocol. Signed-off-by: Daniel Kiper --- v15 - suggestions/fixes: - rearrange inline assembly arguments in xen/arch/x86/efi/stub.c:efi_multiboot2() (suggested by Jan Beulich), - improve comments in error handling in legacy BIOS Multiboot2 scanning loop (suggested by Jan Beulich). v14 - suggestions/fixes: - mark .init.data section as writable; by the way we must change similar definition in xen/arch/x86/boot/x86_64.S because otherwise compiler complains about section types conflicts (suggested by Jan Beulich), - use %r15 instead of %r15d (suggested by Jan Beulich), - remove redundant add from UEFI stack alignment (suggested by Jan Beulich), - use "mov (%rsp),%rdi" instead of "pop %rdi/push %rdi" (suggested by Jan Beulich), - return void instead of paddr_t from efi_multiboot2() and then simplify a bit trampoline setup assembly (suggested by Jan Beulich), - remove "(XEN)" from efi_multiboot2() stub error messages (suggested by Jan Beulich), - move err from inline assembly OutputOperands to InputOperands in stub.c:efi_multiboot2(); this way we avoid following compile time error: stub.c: In function ‘efi_multiboot2’: stub.c:36:5: error: read-only variable ‘err’ used as ‘asm’ output asm volatile( ^~~ issue was introduced by changing err type to "static const CHAR16 __initconst"; potentially we can revert this change but move to InputOperands looks better IMO; even if we are not able to specify %rdx in Clobbers; simply we do not care because next instruction after call is hlt (discovered by Konrad Rzeszutek Wilk and Marcos Matsunaga), - take into account MBI_SPACE_MIN in ASSERT((trampoline_end - trampoline_start) < ...) (suggested by Jan Beulich), - improve comments (suggested by Jan Beulich). v13 - suggestions/fixes: - move vga_text_buffer and efi_platform to .init.data section (suggested by Jan Beulich), - reduce number of error branches in EFI code in xen/arch/x86/boot/head.S (suggested by Jan Beulich), - rename run_bs label to .Lrun_bs (suggested by Jan Beulich), - align the stack as UEFI spec requires (suggested by Jan Beulich), - change trampoline region memory layout (suggested by Jan Beulich), - revert changes in efi_arch_pre_exit_boot() (suggested by Jan Beulich), - relocate_trampoline() must set trampoline_phys for all bootloaders; otherwise fallback allocator is always used if Xen was loaded with Multiboot2 protocol, - change err type in efi_multiboot2() to "static const CHAR16 __initconst" (suggested by Jan Beulich), - change asm "g" constraint to "rm" in efi_multiboot2() (suggested by Jan Beulich), - improve comments (suggested by Jan Beulich and Doug Goldstein). v12 - suggestions/fixes: - rename __efi64_start to __efi64_mb2_start (suggested by Andrew Cooper), - use efi_arch_memory_setup() machinery as trampoline et consortes main memory allocator (suggested by Doug Goldstein), - allocate space for mbi struct in efi_arch_memory_setup() too; this thing was not taken into account in earlier releases, - revert trampoline et consortes fallback memory allocator code in efi_arch_process_memory_map() to current upstream state (suggested by Doug Goldstein), - further simplify efi_arch_pre_exit_boot() code, - call efi_arch_memory_setup() from efi_multiboot2() (suggested by Doug Goldstein), - fix asembly call argument in xen/arch/x86/efi/stub.c (suggested by Andrew Cooper), - add ASSERT() for trampoline size (suggested by Doug Goldstein), - add KB() macro (suggested by Doug Goldstein), - improve comments (suggested by Andrew Cooper and Doug Goldstein). v10 - suggestions/fixes: - replace ljmpl with lretq (suggested by Andrew Cooper), - introduce efi_platform to increase code readability (suggested by Andrew Cooper). v9 - suggestions/fixes: - use .L labels instead of numeric ones in multiboot2 data scanning loops (suggested by Jan Beulich). v8 - suggestions/fixes: - use __bss_start(%rip)/__bss_end(%rip) instead of of .startof.(.bss)(%rip)/$.sizeof.(.bss) because latter is not tested extensively in different built environments yet (suggested by Andrew Cooper), - fix multiboot2 data scanning loop in x86_32 code (suggested by Jan Beulich), - add check for extra mem for mbi data if Xen is loaded via multiboot2 protocol on EFI platform (suggested by Jan Beulich), - improve comments (suggested by Jan Beulich). v7 - suggestions/fixes: - do not allocate twice memory for trampoline if we were loaded via multiboot2 protocol on EFI platform, - wrap long line (suggested by Jan Beulich), - improve comments (suggested by Jan Beulich). v6 - suggestions/fixes: - improve label names in assembly error printing code (suggested by Jan Beulich), - improve comments (suggested by Jan Beulich), - various minor cleanups and fixes (suggested by Jan Beulich). v4 - suggestions/fixes: - remove redundant BSS alignment, - update BSS alignment check, - use __set_bit() instead of set_bit() if possible (suggested by Jan Beulich), - call efi_arch_cpu() from efi_multiboot2() even if the same work is done later in other place right now (suggested by Jan Beulich), - xen/arch/x86/efi/stub.c:efi_multiboot2() fail properly on EFI platforms, - do not read data beyond the end of multiboot2 information in xen/arch/x86/boot/head.S (suggested by Jan Beulich), - use 32-bit registers in x86_64 code if possible (suggested by Jan Beulich), - multiboot2 information address is 64-bit in x86_64 code, so, treat it is as is (suggested by Jan Beulich), - use cmovcc if possible, - leave only one space between rep and stosq (suggested by Jan Beulich), - improve error handling, - improve early error messages, (suggested by Jan Beulich), - improve early error messages printing code, - improve label names (suggested by Jan Beulich), - improve comments (suggested by Jan Beulich), - various minor cleanups. v3 - suggestions/fixes: - take into account alignment when skipping multiboot2 fixed part (suggested by Konrad Rzeszutek Wilk), - improve segment registers initialization (suggested by Jan Beulich), - improve comments (suggested by Jan Beulich and Konrad Rzeszutek Wilk), - improve commit message (suggested by Jan Beulich). v2 - suggestions/fixes: - generate multiboot2 header using macros (suggested by Jan Beulich), - switch CPU to x86_32 mode before jumping to 32-bit code (suggested by Andrew Cooper), - reduce code changes to increase patch readability (suggested by Jan Beulich), - improve comments (suggested by Jan Beulich), - ignore MULTIBOOT2_TAG_TYPE_BASIC_MEMINFO tag on EFI platform and find on my own multiboot2.mem_lower value, - stop execution if EFI platform is detected in legacy BIOS path. --- xen/arch/x86/boot/head.S | 305 ++++++++++++++++++++++++++++++++++--- xen/arch/x86/boot/reloc.c | 2 +- xen/arch/x86/efi/efi-boot.h | 49 +++++- xen/arch/x86/efi/stub.c | 39 +++++ xen/arch/x86/x86_64/asm-offsets.c | 2 + xen/arch/x86/xen.lds.S | 7 +- xen/common/efi/boot.c | 11 ++ xen/include/asm-x86/config.h | 5 + xen/include/xen/config.h | 1 + 9 files changed, 399 insertions(+), 22 deletions(-) diff --git a/xen/arch/x86/boot/head.S b/xen/arch/x86/boot/head.S index 84cf44d..eb738d4 100644 --- a/xen/arch/x86/boot/head.S +++ b/xen/arch/x86/boot/head.S @@ -89,6 +89,13 @@ multiboot2_header_start: 0, /* Number of the lines - no preference. */ \ 0 /* Number of bits per pixel - no preference. */ + /* Request that ExitBootServices() not be called. */ + mb2ht_init MB2_HT(EFI_BS), MB2_HT(OPTIONAL) + + /* EFI64 Multiboot2 entry point. */ + mb2ht_init MB2_HT(ENTRY_ADDRESS_EFI64), MB2_HT(OPTIONAL), \ + sym_phys(__efi64_mb2_start) + /* Multiboot2 header end tag. */ mb2ht_init MB2_HT(END), MB2_HT(REQUIRED) .Lmultiboot2_header_end: @@ -100,20 +107,50 @@ multiboot2_header_start: gdt_boot_descr: .word 6*8-1 .long sym_phys(trampoline_gdt) + .long 0 /* Needed for 64-bit lgdt */ .Lbad_cpu_msg: .asciz "ERR: Not a 64-bit CPU!" .Lbad_ldr_msg: .asciz "ERR: Not a Multiboot bootloader!" +.Lbad_ldr_nbs: .asciz "ERR: Bootloader shutdown EFI x64 boot services!" +.Lbad_ldr_nst: .asciz "ERR: EFI SystemTable is not provided by bootloader!" +.Lbad_ldr_nih: .asciz "ERR: EFI ImageHandle is not provided by bootloader!" +.Lbad_efi_msg: .asciz "ERR: EFI IA-32 platforms are not supported!" + + .section .init.data, "aw", @progbits + .align 4 + +vga_text_buffer: + .long 0xb8000 + +efi_platform: + .byte 0 .section .init.text, "ax", @progbits bad_cpu: mov $(sym_phys(.Lbad_cpu_msg)),%esi # Error message - jmp print_err + jmp .Lget_vtb not_multiboot: mov $(sym_phys(.Lbad_ldr_msg)),%esi # Error message -print_err: - mov $0xB8000,%edi # VGA framebuffer -1: mov (%esi),%bl + jmp .Lget_vtb +.Lmb2_no_st: + mov $(sym_phys(.Lbad_ldr_nst)),%esi # Error message + jmp .Lget_vtb +.Lmb2_no_ih: + mov $(sym_phys(.Lbad_ldr_nih)),%esi # Error message + jmp .Lget_vtb +.Lmb2_no_bs: + mov $(sym_phys(.Lbad_ldr_nbs)),%esi # Error message + xor %edi,%edi # No VGA text buffer + jmp .Lsend_chr +.Lmb2_efi_ia_32: + mov $(sym_phys(.Lbad_efi_msg)),%esi # Error message + xor %edi,%edi # No VGA text buffer + jmp .Lsend_chr +.Lget_vtb: + mov sym_phys(vga_text_buffer),%edi +.Lsend_chr: + mov (%esi),%bl test %bl,%bl # Terminate on '\0' sentinel je .Lhalt mov $0x3f8+5,%dx # UART Line Status Register @@ -123,13 +160,192 @@ print_err: mov $0x3f8+0,%dx # UART Transmit Holding Register mov %bl,%al out %al,%dx # Send a character over the serial line - movsb # Write a character to the VGA framebuffer + test %edi,%edi # Is the VGA text buffer available? + jz .Lsend_chr + movsb # Write a character to the VGA text buffer mov $7,%al - stosb # Write an attribute to the VGA framebuffer - jmp 1b + stosb # Write an attribute to the VGA text buffer + jmp .Lsend_chr .Lhalt: hlt jmp .Lhalt + .code64 + +__efi64_mb2_start: + /* + * Multiboot2 spec says that here CPU is in 64-bit mode. However, + * there is also guarantee that all code and data is always put + * by the bootloader below 4 GiB. Hence, we can safely truncate + * addresses to 32-bits in most cases below. + */ + + cld + + /* VGA is not available on EFI platforms. */ + movl $0,vga_text_buffer(%rip) + + /* Check for Multiboot2 bootloader. */ + cmp $MULTIBOOT2_BOOTLOADER_MAGIC,%eax + je .Lefi_multiboot2_proto + + /* Jump to not_multiboot after switching CPU to x86_32 mode. */ + lea not_multiboot(%rip),%r15 + jmp x86_32_switch + +.Lefi_multiboot2_proto: + /* Zero EFI SystemTable and EFI ImageHandle addresses. */ + xor %esi,%esi + xor %edi,%edi + + /* Skip Multiboot2 information fixed part. */ + lea (MB2_fixed_sizeof+MULTIBOOT2_TAG_ALIGN-1)(%rbx),%ecx + and $~(MULTIBOOT2_TAG_ALIGN-1),%ecx + +.Lefi_mb2_tsize: + /* Check Multiboot2 information total size. */ + mov %ecx,%r8d + sub %ebx,%r8d + cmp %r8d,MB2_fixed_total_size(%rbx) + jbe .Lrun_bs + + /* Are EFI boot services available? */ + cmpl $MULTIBOOT2_TAG_TYPE_EFI_BS,MB2_tag_type(%rcx) + jne .Lefi_mb2_st + + /* We are on EFI platform and EFI boot services are available. */ + incb efi_platform(%rip) + + /* + * Disable real mode and other legacy stuff which should not + * be run on EFI platforms. + */ + incb skip_realmode(%rip) + jmp .Lefi_mb2_next_tag + +.Lefi_mb2_st: + /* Get EFI SystemTable address from Multiboot2 information. */ + cmpl $MULTIBOOT2_TAG_TYPE_EFI64,MB2_tag_type(%rcx) + cmove MB2_efi64_st(%rcx),%rsi + je .Lefi_mb2_next_tag + + /* Get EFI ImageHandle address from Multiboot2 information. */ + cmpl $MULTIBOOT2_TAG_TYPE_EFI64_IH,MB2_tag_type(%rcx) + cmove MB2_efi64_ih(%rcx),%rdi + je .Lefi_mb2_next_tag + + /* Is it the end of Multiboot2 information? */ + cmpl $MULTIBOOT2_TAG_TYPE_END,MB2_tag_type(%rcx) + je .Lrun_bs + +.Lefi_mb2_next_tag: + /* Go to next Multiboot2 information tag. */ + add MB2_tag_size(%rcx),%ecx + add $(MULTIBOOT2_TAG_ALIGN-1),%ecx + and $~(MULTIBOOT2_TAG_ALIGN-1),%ecx + jmp .Lefi_mb2_tsize + +.Lrun_bs: + /* Are EFI boot services available? */ + cmpb $0,efi_platform(%rip) + + /* Jump to .Lmb2_no_bs after switching CPU to x86_32 mode. */ + lea .Lmb2_no_bs(%rip),%r15 + jz x86_32_switch + + /* Is EFI SystemTable address provided by boot loader? */ + test %rsi,%rsi + + /* Jump to .Lmb2_no_st after switching CPU to x86_32 mode. */ + lea .Lmb2_no_st(%rip),%r15 + jz x86_32_switch + + /* Is EFI ImageHandle address provided by boot loader? */ + test %rdi,%rdi + + /* Jump to .Lmb2_no_ih after switching CPU to x86_32 mode. */ + lea .Lmb2_no_ih(%rip),%r15 + jz x86_32_switch + + /* + * Align the stack as UEFI spec requires. Keep it aligned + * before efi_multiboot2() call by pushing/popping even + * numbers of items on it. + */ + and $~15,%rsp + + /* Save Multiboot2 magic on the stack. */ + push %rax + + /* Save EFI ImageHandle on the stack. */ + push %rdi + + /* + * Initialize BSS (no nasty surprises!). + * It must be done earlier than in BIOS case + * because efi_multiboot2() touches it. + */ + lea __bss_start(%rip),%edi + lea __bss_end(%rip),%ecx + sub %edi,%ecx + shr $3,%ecx + xor %eax,%eax + rep stosq + + /* Keep the stack aligned. Do not pop a single item off it. */ + mov (%rsp),%rdi + + /* + * efi_multiboot2() is called according to System V AMD64 ABI: + * - IN: %rdi - EFI ImageHandle, %rsi - EFI SystemTable. + */ + call efi_multiboot2 + + /* Just pop an item from the stack. */ + pop %rax + + /* Restore Multiboot2 magic. */ + pop %rax + + /* Jump to trampoline_setup after switching CPU to x86_32 mode. */ + lea trampoline_setup(%rip),%r15 + +x86_32_switch: + mov %r15,%rdi + + cli + + /* Initialize GDTR. */ + lgdt gdt_boot_descr(%rip) + + /* Reload code selector. */ + pushq $BOOT_CS32 + lea cs32_switch(%rip),%edx + push %rdx + lretq + + .code32 + +cs32_switch: + /* Initialize basic data segments. */ + mov $BOOT_DS,%edx + mov %edx,%ds + mov %edx,%es + mov %edx,%ss + /* %esp is initialized later. */ + + /* Load null descriptor to unused segment registers. */ + xor %edx,%edx + mov %edx,%fs + mov %edx,%gs + + /* Disable paging. */ + mov %cr0,%edx + and $(~X86_CR0_PG),%edx + mov %edx,%cr0 + + /* Jump to earlier loaded address. */ + jmp *%edi + __start: cld cli @@ -157,7 +373,7 @@ __start: /* Not available? BDA value will be fine. */ cmovnz MB_mem_lower(%ebx),%edx - jmp trampoline_setup + jmp trampoline_bios_setup .Lmultiboot2_proto: /* Skip Multiboot2 information fixed part. */ @@ -169,24 +385,41 @@ __start: mov %ecx,%edi sub %ebx,%edi cmp %edi,MB2_fixed_total_size(%ebx) - jbe trampoline_setup + jbe trampoline_bios_setup /* Get mem_lower from Multiboot2 information. */ cmpl $MULTIBOOT2_TAG_TYPE_BASIC_MEMINFO,MB2_tag_type(%ecx) cmove MB2_mem_lower(%ecx),%edx - je trampoline_setup + je .Lmb2_next_tag + + /* EFI IA-32 platforms are not supported. */ + cmpl $MULTIBOOT2_TAG_TYPE_EFI32,MB2_tag_type(%ecx) + /* + * Here we should zap vga_text_buffer. However, we can disable + * VGA updates in simpler and more reliable way later. + */ + je .Lmb2_efi_ia_32 + + /* Bootloader shutdown EFI x64 boot services. */ + cmpl $MULTIBOOT2_TAG_TYPE_EFI64,MB2_tag_type(%ecx) + /* + * Here we should zap vga_text_buffer. However, we can disable + * VGA updates in simpler and more reliable way later. + */ + je .Lmb2_no_bs /* Is it the end of Multiboot2 information? */ cmpl $MULTIBOOT2_TAG_TYPE_END,MB2_tag_type(%ecx) - je trampoline_setup + je trampoline_bios_setup +.Lmb2_next_tag: /* Go to next Multiboot2 information tag. */ add MB2_tag_size(%ecx),%ecx add $(MULTIBOOT2_TAG_ALIGN-1),%ecx and $~(MULTIBOOT2_TAG_ALIGN-1),%ecx jmp .Lmb2_tsize -trampoline_setup: +trampoline_bios_setup: /* Set up trampoline segment 64k below EBDA */ movzwl 0x40e,%ecx /* EBDA segment */ cmp $0xa000,%ecx /* sanity check (high) */ @@ -207,23 +440,54 @@ trampoline_setup: cmp %ecx,%edx /* compare with BDA value */ cmovb %edx,%ecx /* and use the smaller */ -2: /* Reserve 64kb for the trampoline */ - sub $0x1000,%ecx +2: + /* Reserve memory for the trampoline and the low-memory stack. */ + sub $((TRAMPOLINE_SPACE+TRAMPOLINE_STACK_SPACE)>>4),%ecx /* From arch/x86/smpboot.c: start_eip had better be page-aligned! */ xor %cl, %cl shl $4, %ecx mov %ecx,sym_phys(trampoline_phys) +trampoline_setup: + mov sym_phys(trampoline_phys),%ecx + + /* Get bottom-most low-memory stack address. */ + add $TRAMPOLINE_SPACE,%ecx + /* Save the Multiboot info struct (after relocation) for later use. */ mov $sym_phys(cpu0_stack)+1024,%esp - push %ecx /* Boot trampoline address. */ + push %ecx /* Bottom-most low-memory stack address. */ push %ebx /* Multiboot information address. */ push %eax /* Multiboot magic. */ call reloc mov %eax,sym_phys(multiboot_ptr) - /* Initialize BSS (no nasty surprises!) */ + /* + * Now trampoline_phys points to the following structure (lowest address + * is at the bottom): + * + * +------------------------+ + * | TRAMPOLINE_STACK_SPACE | + * +------------------------+ + * | mbi data | + * +- - - - - - - - - - - - + + * | TRAMPOLINE_SPACE | + * +------------------------+ + * + * mbi data grows downwards from the highest address of TRAMPOLINE_SPACE + * region to the end of the trampoline. The rest of TRAMPOLINE_SPACE is + * reserved for trampoline code and data. + */ + + /* + * Do not zero BSS on EFI platform here. + * It was initialized earlier. + */ + cmpb $0,sym_phys(efi_platform) + jnz 1f + + /* Initialize BSS (no nasty surprises!). */ mov $sym_phys(__bss_start),%edi mov $sym_phys(__bss_end),%ecx sub %edi,%ecx @@ -231,6 +495,7 @@ trampoline_setup: shr $2,%ecx rep stosl +1: /* Interrogate CPU extended features via CPUID. */ mov $0x80000000,%eax cpuid @@ -282,6 +547,10 @@ trampoline_setup: cmp $sym_phys(__trampoline_seg_stop),%edi jb 1b + /* Do not parse command line on EFI platform here. */ + cmpb $0,sym_phys(efi_platform) + jnz 1f + /* Bail if there is no command line to parse. */ mov sym_phys(multiboot_ptr),%ebx testl $MBI_CMDLINE,MB_flags(%ebx) @@ -292,9 +561,9 @@ trampoline_setup: call cmdline_parse_early 1: - /* Switch to low-memory stack. */ + /* Switch to low-memory stack which lives at the end of trampoline region. */ mov sym_phys(trampoline_phys),%edi - lea 0x10000(%edi),%esp + lea TRAMPOLINE_SPACE+TRAMPOLINE_STACK_SPACE(%edi),%esp lea trampoline_boot_cpu_entry-trampoline_start(%edi),%eax pushl $BOOT_CS32 push %eax diff --git a/xen/arch/x86/boot/reloc.c b/xen/arch/x86/boot/reloc.c index 91fab9d..b992678 100644 --- a/xen/arch/x86/boot/reloc.c +++ b/xen/arch/x86/boot/reloc.c @@ -16,7 +16,7 @@ * This entry point is entered from xen/arch/x86/boot/head.S with: * - 0x4(%esp) = MULTIBOOT_MAGIC, * - 0x8(%esp) = MULTIBOOT_INFORMATION_ADDRESS, - * - 0xc(%esp) = BOOT_TRAMPOLINE_ADDRESS. + * - 0xc(%esp) = TOPMOST_LOW_MEMORY_STACK_ADDRESS. */ asm ( " .text \n" diff --git a/xen/arch/x86/efi/efi-boot.h b/xen/arch/x86/efi/efi-boot.h index 62c010e..94418bf 100644 --- a/xen/arch/x86/efi/efi-boot.h +++ b/xen/arch/x86/efi/efi-boot.h @@ -101,6 +101,10 @@ static void __init relocate_trampoline(unsigned long phys) const s32 *trampoline_ptr; trampoline_phys = phys; + + if ( !efi_enabled(EFI_LOADER) ) + return; + /* Apply relocations to trampoline. */ for ( trampoline_ptr = __trampoline_rel_start; trampoline_ptr < __trampoline_rel_stop; @@ -550,7 +554,12 @@ static void __init efi_arch_memory_setup(void) /* Allocate space for trampoline (in first Mb). */ cfg.addr = 0x100000; - cfg.size = trampoline_end - trampoline_start; + + if ( efi_enabled(EFI_LOADER) ) + cfg.size = trampoline_end - trampoline_start; + else + cfg.size = TRAMPOLINE_SPACE + TRAMPOLINE_STACK_SPACE; + status = efi_bs->AllocatePages(AllocateMaxAddress, EfiLoaderData, PFN_UP(cfg.size), &cfg.addr); if ( status == EFI_SUCCESS ) @@ -561,6 +570,9 @@ static void __init efi_arch_memory_setup(void) PrintStr(L"Trampoline space cannot be allocated; will try fallback.\r\n"); } + if ( !efi_enabled(EFI_LOADER) ) + return; + /* Initialise L2 identity-map and boot-map page table entries (16MB). */ for ( i = 0; i < 8; ++i ) { @@ -653,6 +665,41 @@ static bool_t __init efi_arch_use_config_file(EFI_SYSTEM_TABLE *SystemTable) static void efi_arch_flush_dcache_area(const void *vaddr, UINTN size) { } +void __init efi_multiboot2(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) +{ + EFI_GRAPHICS_OUTPUT_PROTOCOL *gop; + UINTN cols, gop_mode = ~0, rows; + + __set_bit(EFI_BOOT, &efi_flags); + __set_bit(EFI_RS, &efi_flags); + + efi_init(ImageHandle, SystemTable); + + efi_console_set_mode(); + + if ( StdOut->QueryMode(StdOut, StdOut->Mode->Mode, + &cols, &rows) == EFI_SUCCESS ) + efi_arch_console_init(cols, rows); + + gop = efi_get_gop(); + + if ( gop ) + gop_mode = efi_find_gop_mode(gop, 0, 0, 0); + + efi_arch_edd(); + efi_arch_cpu(); + + efi_tables(); + setup_efi_pci(); + efi_variables(); + efi_arch_memory_setup(); + + if ( gop ) + efi_set_gop_mode(gop, gop_mode); + + efi_exit_boot(ImageHandle, SystemTable); +} + /* * Local variables: * mode: C diff --git a/xen/arch/x86/efi/stub.c b/xen/arch/x86/efi/stub.c index 4158124..17da050 100644 --- a/xen/arch/x86/efi/stub.c +++ b/xen/arch/x86/efi/stub.c @@ -3,6 +3,45 @@ #include #include #include +#include +#include +#include +#include +#include +#include + +/* + * Here we are in EFI stub. EFI calls are not supported due to lack + * of relevant functionality in compiler and/or linker. + * + * efi_multiboot2() is an exception. Please look below for more details. + */ + +void __init noreturn efi_multiboot2(EFI_HANDLE ImageHandle, + EFI_SYSTEM_TABLE *SystemTable) +{ + static const CHAR16 __initconst err[] = + L"Xen does not have EFI code build in!\r\nSystem halted!\r\n"; + SIMPLE_TEXT_OUTPUT_INTERFACE *StdErr; + + StdErr = SystemTable->StdErr ? SystemTable->StdErr : SystemTable->ConOut; + + /* + * Print error message and halt the system. + * + * We have to open code MS x64 calling convention + * in assembly because here this convention may + * not be directly supported by C compiler. + */ + asm volatile( + " call *%3 \n" + "0: hlt \n" + " jmp 0b \n" + : "+c" (StdErr), "=d" (StdErr) : "1" (err), "rm" (StdErr->OutputString) + : "rax", "r8", "r9", "r10", "r11", "memory"); + + unreachable(); +} bool efi_enabled(unsigned int feature) { diff --git a/xen/arch/x86/x86_64/asm-offsets.c b/xen/arch/x86/x86_64/asm-offsets.c index 92f5d81..f135654 100644 --- a/xen/arch/x86/x86_64/asm-offsets.c +++ b/xen/arch/x86/x86_64/asm-offsets.c @@ -175,6 +175,8 @@ void __dummy__(void) OFFSET(MB2_tag_type, multiboot2_tag_t, type); OFFSET(MB2_tag_size, multiboot2_tag_t, size); 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); BLANK(); OFFSET(DOMAIN_vm_assist, struct domain, vm_assist); diff --git a/xen/arch/x86/xen.lds.S b/xen/arch/x86/xen.lds.S index b0b1c9b..76e18ab 100644 --- a/xen/arch/x86/xen.lds.S +++ b/xen/arch/x86/xen.lds.S @@ -331,5 +331,8 @@ ASSERT(IS_ALIGNED(__init_end, PAGE_SIZE), "__init_end misaligned") ASSERT(IS_ALIGNED(trampoline_start, 4), "trampoline_start misaligned") ASSERT(IS_ALIGNED(trampoline_end, 4), "trampoline_end misaligned") -ASSERT(IS_ALIGNED(__bss_start, 4), "__bss_start misaligned") -ASSERT(IS_ALIGNED(__bss_end, 4), "__bss_end misaligned") +ASSERT(IS_ALIGNED(__bss_start, 8), "__bss_start misaligned") +ASSERT(IS_ALIGNED(__bss_end, 8), "__bss_end misaligned") + +ASSERT((trampoline_end - trampoline_start) < TRAMPOLINE_SPACE - MBI_SPACE_MIN, + "not enough room for trampoline and mbi data") diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c index 36dbb71..b6cbdad 100644 --- a/xen/common/efi/boot.c +++ b/xen/common/efi/boot.c @@ -79,6 +79,17 @@ static size_t wstrlen(const CHAR16 * s); static int set_color(u32 mask, int bpp, u8 *pos, u8 *sz); static bool_t match_guid(const EFI_GUID *guid1, const EFI_GUID *guid2); +static void efi_init(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable); +static void efi_console_set_mode(void); +static EFI_GRAPHICS_OUTPUT_PROTOCOL *efi_get_gop(void); +static UINTN efi_find_gop_mode(EFI_GRAPHICS_OUTPUT_PROTOCOL *gop, + UINTN cols, UINTN rows, UINTN depth); +static void efi_tables(void); +static void setup_efi_pci(void); +static void efi_variables(void); +static void efi_set_gop_mode(EFI_GRAPHICS_OUTPUT_PROTOCOL *gop, UINTN gop_mode); +static void efi_exit_boot(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable); + static const EFI_BOOT_SERVICES *__initdata efi_bs; static UINT32 __initdata efi_bs_revision; static EFI_HANDLE __initdata efi_ih; diff --git a/xen/include/asm-x86/config.h b/xen/include/asm-x86/config.h index 6fd84e7..b9a6d94 100644 --- a/xen/include/asm-x86/config.h +++ b/xen/include/asm-x86/config.h @@ -73,6 +73,11 @@ #define STACK_ORDER 3 #define STACK_SIZE (PAGE_SIZE << STACK_ORDER) +#define TRAMPOLINE_STACK_SPACE PAGE_SIZE +#define TRAMPOLINE_SPACE (KB(64) - TRAMPOLINE_STACK_SPACE) + +#define MBI_SPACE_MIN (2 * PAGE_SIZE) + /* Primary stack is restricted to 8kB by guard pages. */ #define PRIMARY_STACK_SIZE 8192 diff --git a/xen/include/xen/config.h b/xen/include/xen/config.h index 473c5e8..04e4da5 100644 --- a/xen/include/xen/config.h +++ b/xen/include/xen/config.h @@ -70,6 +70,7 @@ #define __force #define __bitwise +#define KB(_kb) (_AC(_kb, ULL) << 10) #define MB(_mb) (_AC(_mb, ULL) << 20) #define GB(_gb) (_AC(_gb, ULL) << 30)