This code implements the "kpssv2" flavour of CPU regulator/clock gating in Linux. It's used by at least the ipq4018/4019 to power on and off CPU cores. This is based on the Linux implementation - the register definitions and values are from Linux and I've reverse engineered the sequencing requirements. The MP bring-up is: * set cold boot address via an SCM call - this is the address used by the bootloader/TZ firmware to jump to when the CPUs boot * power down the LDO feeding the CPU core and wait for it to settle * program in the right set of LDO and power tree configuration for the CPU regulator to power up the core. Unfortunately these are magic numbers that I've not found documented anywhere. * (I think) power up the shared L2 cache connect if it isn't. * Clamp the power into the core down; put the core into reset * Unclamp the power rail; release reset; and then set the core to boot. The MP core will then boot the bootloader/TZ firmware and then will wait until an incoming interrupt kicks it to start @ mpentry. Tested: * IPQ4019, 4 CPUs Release APs CPU(3) applied BP hardening: not necessary CPU(1) applied BP hardening: not necessary CPU(2) applied BP hardening: not necessary Reviewed by: andrew, manu, imp Differential Revision: https://reviews.freebsd.org/D32723 |
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.cirrus-ci | ||
.github | ||
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.md | ||
RELNOTES | ||
UPDATING |
FreeBSD Source:
This is the top level of the FreeBSD source directory.
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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Source Roadmap:
Directory | Description |
---|---|
bin | System/user commands. |
cddl | Various commands and libraries under the Common Development and Distribution License. |
contrib | Packages contributed by 3rd parties. |
crypto | Cryptography stuff (see crypto/README). |
etc | Template files for /etc. |
gnu | Various commands and libraries under the GNU Public License. Please see gnu/COPYING and gnu/COPYING.LIB for more information. |
include | System include files. |
kerberos5 | Kerberos5 (Heimdal) package. |
lib | System libraries. |
libexec | System daemons. |
release | Release building Makefile & associated tools. |
rescue | Build system for statically linked /rescue utilities. |
sbin | System commands. |
secure | Cryptographic libraries and commands. |
share | Shared resources. |
stand | Boot loader sources. |
sys | Kernel sources. |
sys/arch /conf |
Kernel configuration files. GENERIC is the configuration used in release builds. NOTES contains documentation of all possible entries. |
tests | Regression tests which can be run by Kyua. See tests/README for additional information. |
tools | Utilities for regression testing and miscellaneous tasks. |
usr.bin | User commands. |
usr.sbin | System administration commands. |
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