f2566be5ce
The device tree may contain a "reserved-memory" node, whose purpose is to communicate sections of physical memory that should not be used for general allocations. Add the logic to parse and exclude these regions. The particular motivation for this is protection of the SBI runtime firmware. Currently, there is no mechanism through which the SBI can communicate the details of its reserved memory region(s) to a supervisor payload. There has been some discussion recently on how this can be achieved [1], and it seems that the path going forward will be to add an entry to the reserved-memory node. This hasn't caused any issues for us yet, since we exclude all physical memory below the kernel's load address from being allocated, and on all currently supported platforms this covers the SBI firmware region. This will change in another commit, so as a safety measure, ensure that the lowest 2MB of memory is excluded if this region has not been reported. [1] https://github.com/riscv/riscv-sbi-doc/pull/37 Reviewed by: markj, nick (older version) Differential Revision: https://reviews.freebsd.org/D24155 |
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| bin | ||
| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| stand | ||
| sys | ||
| targets | ||
| tests | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| .arcconfig | ||
| .arclint | ||
| .cirrus.yml | ||
| .clang-format | ||
| .gitattributes | ||
| .gitignore | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.libcompat | ||
| Makefile.sys.inc | ||
| ObsoleteFiles.inc | ||
| README | ||
| README.md | ||
| RELNOTES | ||
| UPDATING | ||
FreeBSD Source:
This is the top level of the FreeBSD source directory. This file
was last revised on:
FreeBSD
FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.
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The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html, and https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information, including setting make(1) variables.
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include System include files.
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share Shared resources.
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