The nvmem interface helps provider of nvmem data to expose themselves to consumer.
NVMEM is generally present on some embedded board in a form of eeprom or fuses.
The nvmem api are helpers for consumer to read/write the cell data from a provider.
Differential Revision: https://reviews.freebsd.org/D16419
This calls into the Arm Trusted Firmware to enable and disable the
workaround for the Speculative Store Bypass Disable (SSBD) issue, also
known as Spectre Variant 4.
As this may have a large performance overhead, and how exploitable SSBD is
is unknown we follow the Linux lead of allowing the administrator to select
between always on, always off, or only enabled in the kernel, with the
latter being the default.
PR: 228955
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D15819
See the commit log messages for r321378 and r336288 for descriptions of
this functionality.
Reviewed by: alc
Differential Revision: https://reviews.freebsd.org/D16303
We can now have efifb being setup correctly.
Enjoy video output on some boards when you couldn't before.
Tested-On: Pine64
Tested-On: Pine64-LTS
Tested-On: Pinebook
Some driver (like efifb) needs to map more than the current L2_SIZE
Raise the size so we can map the framebuffer setup by the bootloader.
Reviewed by: cognet
These changes ensure that reclaim_pv_chunk() can be safely be
executed concurrently by multiple threads.
Reviewed by: alc
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D16304
Xilinx Ultrascale+ are based on Cortex-A53 and use existing
UART driver (uart_dev_cdnc). Enable it in arm64 GENERIC config.
Submitted by: Michal Stanek <mst@semihalf.com>
Obtained from: Semihalf
This addresses a problem described in r335784, where memory
pressure forces reclamation of a PV chunk and in rare cases leads to a
use-after-free of a page table page.
Reviewed by: alc, kib
MFC after: 3 weeks
Differential Revision: https://reviews.freebsd.org/D16181
Linux/arm64 is CLONE_BACKWARDS - i.e., "Architecture has tls passed as
the 4th argument of clone(2), not the 5th one."
The linux clone() syscall has four different permutations of argument
order, depending on architecture - see the #ifdef CONFIG_CLONE_BACKWARDS
maze in Linux's kernel/fork.c.
Sponsored by: Turing Robotic Industries
- Change pcpu zone consumers to use a stride size of PAGE_SIZE.
(defined as UMA_PCPU_ALLOC_SIZE to make future identification easier)
- Allocate page from the correct domain for a given cpu.
- Don't initialize pc_domain to non-zero value if NUMA is not defined
There are some misconceptions surrounding this field. It is the
_VM_ NUMA domain and should only ever correspond to valid domain
values as understood by the VM.
The former slab size of sizeof(struct pcpu) was somewhat arbitrary.
The new value is PAGE_SIZE because that's the smallest granularity
which the VM can allocate a slab for a given domain. If you have
fewer than PAGE_SIZE/8 counters on your system there will be some
memory wasted, but this is obviously something where you want the
cache line to be coming from the correct domain.
Reviewed by: jeff
Sponsored by: Limelight Networks
Differential Revision: https://reviews.freebsd.org/D15933
This needs to be revisited with the VDSO implementation, but is
sufficient to allow the linux64 module to build on arm64 for testing
and development.
Sponsored by: Turing Robotic Industries
the Linuxulator. We need to translate error values onto Linux errno values
and return them to userspace when a syscall fails. We also need to preserve
x1 as all registers are preserved other than the return value.
Reviewed by: emaste
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D16008
This is sufficient to run Linux arm64 'hello world' and other simple
binaries.
Reviewed by: andrew
Sponsored by: Turing Robotic Industries
Differential Revision: https://reviews.freebsd.org/D15834
The call to reclaim_pv_chunk() in reserve_pv_entries() may free a
PV chunk with free entries belonging to the current pmap. In this
case we must account for the free entries that were reclaimed, or
reserve_pv_entries() may return without having reserved the requested
number of entries.
Reviewed by: alc, kib
Tested by: pho (previous version)
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D15911
This is needed for efifb.
arm and ricv pmap (the two arch with arm64 that uses subr_devmap) have very
different implementation so for now only add this for arm64.
Tested with efifb on Pine64 with a few other patches.
Reviewed by: cognet
Differential Revision: https://reviews.freebsd.org/D15294
The values for tx/rx delays differs accross the different DTS.
Mainline Linux set it to 0x24/0x18
Mostly-Vendor u-boot (the one maintained and developped) to 0x18/0x18
Mostly-Vendor linux (the one maintained and developped) to 0x26/0x11
By experience only 0x18/0x18 works so until the issue is resolved rely on
the bootloader settings.
The property are named {t,r}x_delay and not {t,r}-delay.
The upper bits of the register are a mask of which bits is allowed
to be written, set it otherwise we write nothing.
OF_getencprop returns <0 = for an error.
Pointy Hat: myself
Reported by: jmcneill (delay and mask bits)
This provides stub implementations of arm64 Linux vdso and machdep,
ptrace, and futex sufficient for executing an arm64 Linux 'hello world'
binary.
Reviewed by: andrew
Sponsored by: Turing Robotic Industries
Differential Revision: https://reviews.freebsd.org/D15832
This controller have a special mode for RX to help with smbus-like transfer
when the controller will automatically send the slave address, register address
and read the data. Use it when possible.
The same mode for TX is describe is the datasheet but is broken and have been
since ~10 years of presence of this controller in RockChip SoCs.
Attach this driver early at we need it to communicate with the PMIC early in the
boot.
Do not hook it to the kernel build for now.
Add driver for the designware ethernet controller found in some RockChip SoCs.
The driver still rely on a lot of things setup by the bootloader like clocks
and phy mode.
But since netbooting is the only/easiest way to boot rockchip board at the
moment add the driver so other people can test/dev on thoses boards.
This was omitted in r334112 and r334996 which cause the PLL to not correctly
reparent, leaving the armclk to be derived from the APLL instead of the NPLL.
The arm core clock is now correctly set to 600Mhz via the assigned-clock present
in the DTB.
RockChip PLL have two modes controlled by a register, a "slow mode" (the
default one) where the frequency is derived from the 24Mhz oscillator on the
board, and a "normal" one when the pll take it's input from the real PLL output.
Default the mode to normal for all the PLLs.
This is the only node we are interested in so do not waste time to test
creating device that will be either unused or fail as most of the nodes
don't have a compatible string.
Parent needs to be the same frequency as the armclk, not twice the freq.
The real divider is incremented by one so write it with - 1
The rate can be at index 0
Pointy Hat To: myself
breakpoint instruction, however this would lose information that may be
useful for debugging.
These are now handled in a similar way to other exceptions, however it
won't exit out of the exception handler until it is known if we can
handle these exceptions in a useful way.
Sponsored by: DARPA, AFRL
With the introduction of pmap_switch(), the DSB instruction on the
address map switch is not necessary executed, which is fixed by
changing the unlock store to release. Also remove comment which
documented pre-pmap_switch() code.
Reviewed by: andrew
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
