Early_ioremap_reset

Author: tntl

August undefined, 2024

WebKernel.org Bugzilla – Bug 121421 Broadwell / Z97 - Early ioremap leak of 1 areas detected Last modified: 2016-08-04 03:20:05 UTC WebThe early ioremap support introduced by patch bf4b558eba92 ("arm64: add early_ioremap support") failed to add a call to early_ioremap_reset() at an appropriate time. Without this call, invocations of early_ioremap etc. that are done too late will go unnoticed and may cause corruption. This is exactly what happened when the first user of this ...

Setting Up the ARM32 Architecture, part 1 — linusw

WebThe call to ioremap is happening early in the boot process which leads to a panic on x86_64 systems: panic+0x01ca do_exit+0x043c oops_end+0x00a7 no_context+0x0119 __bad_area_nosemaphore+0x0138 bad_area_nosemaphore+0x000e do_page_fault+0x0321 page_fault+0x0020 reserve_memtype+0x02a1 … WebAug 5, 2015 · Like user space, the kernel accesses memory through page tables; as a result, when kernel code needs to access memory-mapped I/O devices, it must first set up an appropriate kernel page-table mapping. The in-kernel tool for that job has long been … iphone 11 comparison to iphone 13

[PATCH v2 0/5] generic early_ioremap support

Web> >>> added a missing call to early_ioremap_reset(). This triggers a BUG if code > >>> tries using early_ioremap() after the early_ioremap_reset(). This is a > >>> problem for some ACPI code which needs short-lived temporary mappings > >>> after paging_init() … WebThis patch creates a generic implementation of early_ioremap() support based on the existing x86 implementation. early_ioremp() is useful for early boot code which needs to temporarily map I/O or memory regions WebThe early ioremap interfaces are intended for situations where boot code needs to make temporary virtual mappings before the normal ioremap interfaces are available. Typically, this means before paging_init() has run. These patches are layered on top of generic fixmap patches which were discussed here ... iphone 11 corner radius

mm/early_ioremap.c - kernel/common - Git at Google

121421 – Broadwell / Z97 - Early ioremap leak of 1 areas detected

WebMessage ID: [email protected] (mailing list archive)State: New, archived: Headers: show Webextern void early_ioremap_setup (void); /* * Called as last step in paging_init() so library can act * accordingly for subsequent map/unmap requests. */ extern void early_ioremap_reset (void); /* * Early copy from unmapped memory to kernel mapped memory. */ extern void copy_from_early_mem (void * dest, phys_addr_t src, unsigned … iphone 11 corner bumpersWebThe initial usage is to support the large graphics aperture on 32-bit processors where ioremap_wc cannot be used to statically map the entire aperture to the CPU as it would consume too much of the kernel address space. A mapping object is created during … iphone 11 contracts uk

"WebThis triggers a BUG if code tries using early_ioremap() after the early_ioremap_reset(). This is a problem for some ACPI code which needs short-lived temporary mappings after paging_init() but before mm_init(). " - Early_ioremap_reset

Early_ioremap_reset

include/asm-generic/early_ioremap.h - kernel/quantenna - Git at …

WebWithout this call, >> invocations of early_ioremap etc. that are done too late will go >> unnoticed and may cause corruption. >> >> This is exactly what happened when the first user of this feature >> was added in patch f84d02755f5a ("arm64: add EFI runtime … WebLKML Archive on lore.kernel.org help / color / mirror / Atom feed * [PATCH v3 0/6] generic early_ioremap support @ 2014-01-10 3:50 Mark Salter 2014-01-10 3:50 ` [PATCH v3 1/6] x86/mm: sparse warning fix for early_memremap Mark Salter ` (5 more replies) 0 siblings, 6 replies; 18+ messages in thread From: Mark Salter @ 2014-01-10 3:50 UTC (permalink / …

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WebAug 29, 2009 · I too get this warning message. My "hardware" is a qemu 0.9.1-1ubuntu1 virtual machine, and the kernel is Linux ubuntu 2.6.30-8-generic #9-Ubuntu SMP Wed Jun 3 15:23:55 UTC 2009 i686 GNU/Linux from the live cd of Kubuntu 9.10 karmic alpha 2 … Web// SPDX-License-Identifier: GPL-2.0-only /* * Re-map IO memory to kernel address space so that we can access it. * This is needed for high PCI addresses that aren't mapped in the

Web* Provide common bits of early_ioremap() support for architectures needing * temporary mappings during boot before ioremap() is available. * This is mostly a direct copy of the x86 early_ioremap implementation. Web* Provide common bits of early_ioremap() support for architectures needing * temporary mappings during boot before ioremap() is available. * * This is mostly a direct copy of the x86 early_ioremap implementation. * * (C) Copyright 1995 1996, 2014 Linus Torvalds * …

WebThe early mapping of the EFI memory map is unmapped during an early: initcall, at which time the early ioremap support is long gone. Fix by adding the missing call to early_ioremap_reset to: setup_arch (), and move the offending early_memunmap to right after: the point where the early mapping of the EFI memory map is last used. WebOct 16, 2012 · I have a working version of the driver, but it's currently very slow. So, I've gone back a few steps and tried making a small, simple driver to recreate the problem. I reserve the memory at boot time using the kernel parameter memmap=2G$1G. Then, in the driver's __init function, I ioremap some of this memory, and initialize it to a known value.

Webextern void early_ioremap_setup(void); /* * Called as last step in paging_init() so library can act * accordingly for subsequent map/unmap requests. */ extern void early_ioremap_reset(void); /* * Early copy from unmapped memory to kernel mapped …

WebThe early mapping of the EFI memory map is unmapped during an early initcall, at which time the early ioremap support is long gone. Fix by adding the missing call to early_ioremap_reset() to setup_arch(), and move the offending early_memunmap() to … iphone 11 compatible watchesWebOct 25, 2024 · As ARM32 is using the generic early ioremap code this just calls early_ioremap_setup() in mm/early_ioremap.c. This makes it possible to use early calls to ioremap() . As noted we have defined for NR_FIX_BTMAPS which we use to … iphone 11 cost to buy outright ukWeb/* * Provide common bits of early_ioremap() support for architectures needing * temporary mappings during boot before ioremap() is available. * * This is mostly a direct copy of the x86 early_ioremap implementation. ... void __init early_ioremap_reset(void) { early_ioremap_shutdown(); after_paging_init = 1; } /* * Generally, ioremap() is ... iphone 11 cover elgigantenWebLinux debugging, tracing, profiling & perf. analysis. Check our new training course. with Creative Commons CC-BY-SA iphone 11 cracked back repair costWebFor example, if a PCI device has a BAR, the kernel reads the bus address (A) from the BAR and converts it to a CPU physical address (B). The address B is stored in a struct resource and usually exposed via /proc/iomem. When a driver claims a device, it typically uses ioremap() to map physical address B at a virtual address (C). It can then use ... iphone 11 country of originWebLKML Archive on lore.kernel.org help / color / mirror / Atom feed * [PATCH] x86_32: Construct 32 bit boot time page tables in native format. @ 2008-01-21 22:15 Ian Campbell 0 siblings, 0 replies; only message in thread From: Ian Campbell @ 2008-01-21 22:15 UTC (permalink / raw) To: linux-kernel Cc: Ian Campbell, Thomas Gleixner, Ingo Molnar, H. … iphone 11 cover card holderWeb+ bool "Provide early_ioremap() support for kernel initialization." + select GENERIC_EARLY_IOREMAP + help + Provide a mechanism for kernel initialisation code to temporarily + map, in a highmem-agnostic way, memory pages in before ioremap() + and friends are available (before paging_init() has run). It uses iphone 11 corporate plan