/* Boot.S: boot loader for Siemens DVB-S card Copyright (C) 2001 Convergence integrated media GmbH Written by Ralph Metzler Copyright (C) 2006 Matthieu CASTET This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. */ /* check AV711x_3_1.pdf for some hardware infos build it with : $ cc -mbig-endian -c Boot.S $ ld -Ttext 0x2c000000 -EB -o Boot Boot.o $ objcopy -Obinary Boot */ .text .align .globl _start _start: b reset // reset vector movs pc, r14 // undefined subs pc, r14, #4 // SWI subs pc, r14, #4 // prefetch abort subs pc, r14, #8 // data abort subs pc, r14, #4 // reserved subs pc, r14, #4 // IRQ subs pc, r14, #4 // FIQ .word tbl // table needed by firmware ROM tbl: .word (endtbl - tbl) .word 0 .word conf endtbl: .word 0 conf: .word 0xa5a55a5a .word 0x001f1555 .word 0x00000009 reset: ldr r13, buffer ldr r4, flag mov r0, #0 str r0, [r4] str r0, [r4, #4] ldr r1, wait_address ldr r2, flag_address ldr r3, sram copycode: // copy the code HW Sram ldmia r1!, {r5-r12} stmia r3!, {r5-r12} cmp r1, r2 ble copycode ldr pc, sram // jump to the copied code wait: ldrh r1, [r4] // wait for flag!=0 cmp r1, #0 beq wait mov r1, r13 // buffer address ldr r3, [r4,#4] // destaddr ldrh r2, [r4,#2] // get segment length add r2, r2, #63 // round length to next 64 bytes movs r2, r2, lsr #6 // and divide by 64 moveq r0, #2 // if 0, set flag to 2, else signal strh r0, [r4] // that buffer is accepted by setting to 0 beq wait copyloop: ldmia r1!, {r5-r12} stmia r3!, {r5-r12} ldmia r1!, {r5-r12} stmia r3!, {r5-r12} subs r2, r2, #1 bne copyloop eor r13, r13, #0x1400 // switch to other buffer b wait // flag is stored at 0x2c0003f8, length at 0x2c0003fa, // destaddr at 0x2c0003fc flag: .word 0x2c0003f8 // buffer 1 is at 0x2c000400, buffer 2 at 0x2c001000 buffer: .word 0x2c000400 sram: .word 0x9e000800 wait_address: .word wait flag_address: .word flag
path: root/tools/lib/subcmd/sigchain.h
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authorJiri Kosina <jkosina@suse.cz>2017-01-27 22:25:52 +0000
committerIngo Molnar <mingo@kernel.org>2017-01-28 09:18:56 +0100
commitbf29bddf0417a4783da3b24e8c9e017ac649326f (patch)
tree54a05a4883b73f80e4e1d8c4b15750aa01c39932 /tools/lib/subcmd/sigchain.h
parent883af14e67e8b8702b5560aa64c888c0cd0bd66c (diff)
x86/efi: Always map the first physical page into the EFI pagetables
Commit: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode") stopped creating 1:1 mappings for all RAM, when running in native 64-bit mode. It turns out though that there are 64-bit EFI implementations in the wild (this particular problem has been reported on a Lenovo Yoga 710-11IKB), which still make use of the first physical page for their own private use, even though they explicitly mark it EFI_CONVENTIONAL_MEMORY in the memory map. In case there is no mapping for this particular frame in the EFI pagetables, as soon as firmware tries to make use of it, a triple fault occurs and the system reboots (in case of the Yoga 710-11IKB this is very early during bootup). Fix that by always mapping the first page of physical memory into the EFI pagetables. We're free to hand this page to the BIOS, as trim_bios_range() will reserve the first page and isolate it away from memory allocators anyway. Note that just reverting 129766708 alone is not enough on v4.9-rc1+ to fix the regression on affected hardware, as this commit: ab72a27da ("x86/efi: Consolidate region mapping logic") later made the first physical frame not to be mapped anyway. Reported-by: Hanka Pavlikova <hanka@ucw.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bp@suse.de> Cc: Laura Abbott <labbott@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vojtech Pavlik <vojtech@ucw.cz> Cc: Waiman Long <waiman.long@hpe.com> Cc: linux-efi@vger.kernel.org Cc: stable@kernel.org # v4.8+ Fixes: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode") Link: http://lkml.kernel.org/r/20170127222552.22336-1-matt@codeblueprint.co.uk [ Tidied up the changelog and the comment. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/lib/subcmd/sigchain.h')