Commit Graph

547 Commits

Author SHA1 Message Date
Tomasz Maciej Nowak
539e60539a generic: enable CRYPTO_LIB_BLAKE2S[_X86|_ARM]
This is now built-in, enable so it won't propagate on target configs.

Link: https://lkml.org/lkml/2022/1/3/168
Fixes: 79e7a2552e ("kernel: bump 5.15 to 5.15.44")
Fixes: 0ca9367069 ("kernel: bump 5.10 to 5.10.119")
Signed-off-by: Tomasz Maciej Nowak <tmn505@gmail.com>
(Link to Kernel's commit taht made it built-in,
CRYPTO_LIB_BLAKE2S[_ARM|_X86] as it's selectable, 5.10 backport)
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
2022-06-24 17:10:24 +02:00
Daniel Golle
692d87a27b
mediatek: UniFi 6 LR: disable RTC
There is not RTC battery connected to the SoC of the UniFi 6 LR board.
Disable the RTC to prevent the system coming up with time set to
2000-01-01 00:00:00 after each reboot.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-06-18 17:32:07 +01:00
Felix Fietkau
7676808434 kernel: backport upstream mtk_eth_soc patches
Includes MT7986 ethernet support

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-06-18 10:33:30 +02:00
Henrik Riomar
31d86a1a11 mediatek: add Ubiquiti UniFi 6 LR v2 targets
Add targets:
 * Ubiquiti UniFi 6 LR v2
 * Ubiquiti UniFi 6 LR v2 (U-Boot mod)

This target does not have a RGB led bar like v1 did

Used target/linux/ramips/dts/mt7621_ubnt_unifi.dtsi as inspiration

The white dome LED is default-on, blue will turn on when the system is
in running state

Signed-off-by: Henrik Riomar <henrik.riomar@gmail.com>
2022-06-11 19:51:33 +01:00
Henrik Riomar
5c8d3893a7 mediatek: new target ubnt_unifi-6-lr-v1-ubootmod
based on current ubnt_unifi-6-lr-ubootmod

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
[added SUPPORTED_DEVICES for compatibility with existing setups]
Signed-off-by: Henrik Riomar <henrik.riomar@gmail.com>
2022-06-11 19:51:18 +01:00
Henrik Riomar
15a02471bb mediatek: new target mt7622-ubnt-unifi-6-lr-v1
Based on current mt7622-ubnt-unifi-6-lr, this is a preparation for
adding a v2 version of this target

* v1 - with led-bar
* v2 - two simple GPIO connected LEDs (in later commits)

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
[added SUPPORTED_DEVICES for compatibility with existing setups]
Signed-off-by: Henrik Riomar <henrik.riomar@gmail.com>
2022-06-11 19:50:26 +01:00
Rui Salvaterra
fbf6992f2b kernel: bump 5.15 to 5.15.45
Patches automatically rebased.

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
2022-06-06 19:20:28 +02:00
INAGAKI Hiroshi
58b3b557b6 mediatek: mt7622: add support for ELECOM WRC-X3200GST3
ELECOM WRC-X3200GST3 is a 2.4/5 GHz band 11ax (Wi-Fi 6) router, based on
MT7622B.

Specifications:

- SoC		: MediaTek MT7622B
- RAM		: DDR3 512 MiB (Nanya NT5CC256M16ER-EK)
- Flash		: SPI-NAND 128 MiB (Winbond W25N01GVZEIG)
- WLAN		: 2.4/5 GHz 4T4R
  - 2.4 GHz	: MediaTek MT7622B (SoC)
  - 5 GHz	: MediaTek MT7915A
- Ethernet	: 5x 10/100/1000 Mbps
  - Switch	: MediaTek MT7531
- LEDs/Keys	: 6x/4x (2x buttons, 1x slide-switch)
- UART		: through-hole on PCB
  - J19: 3.3V, GND, TX, RX from power jack side
  - 115200n8
- Power		: 12 VDC, 1.5 A

Flash instruction using factory image:

1. Boot WRC-X3200GST3 normally with "Router" mode
2. Access to "http://192.168.2.1/" and open firmware update page
   ("ファームウェア更新")
3. Select the OpenWrt factory image and click apply ("適用") button
4. Wait ~120 seconds to complete flashing

MAC Addresses:

LAN    : 04:AB:18:xx:xx:77 (Factory, 0x7FFF4 (hex))
WAN    : 04:AB:18:xx:xx:78 (Factory, 0x7FFFA (hex))
2.4 GHz: 04:AB:18:xx:xx:79 (Factory, 0x4     (hex))
5 GHz  : 04:AB:18:xx:xx:7A (none)

Note:

- currently, there is no "phy1tpt" trigger for 5 GHz wlan (MT7915) in
  "trigger" file of LEDs, use "phy1radio" trigger instead

Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
2022-05-21 22:27:01 +01:00
Tony Ambardar
76fae1d169 config: limit CONFIG_DEBUG_INFO to top-level generic configs
Remove redundant target-level entries, noting that these settings will be
configured from "Kernel build options" of Kconfig.

Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
[remove from new configs introduced after patch submission]
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
2022-05-18 13:32:06 +03:00
Rui Salvaterra
d9a063c396 kernel: bump 5.15 to 5.15.38
Deleted (upstreamed):
mediatek/patches-5.15/120-10-v5.18-mtd-nand-fix-ecc-parameters-for-mt7622.patch [1]

Other patches automatically rebased.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.15.38&id=3ec920d755ae69c201b358e8d8e96c32f51145d8

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
2022-05-09 20:49:50 +01:00
Rui Salvaterra
634a45cf1d kernel: bump 5.15 to 5.15.37
Patches automatically rebased.

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
2022-05-09 20:49:50 +01:00
Rui Salvaterra
c3569a70c6 kernel: bump 5.15 to 5.15.36
Patches automatically rebased.

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
2022-05-09 20:49:50 +01:00
Chuanhong Guo
d9ea9c06e9 mediatek: build ubnt-ledbar as a module
The config for LEDS_UBNT_LEDBAR doesn't stay in mt7629 kconfig because
of its I2C dependency. Build it as a module and let buildroot handle
this config option instead.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-30 23:13:33 +08:00
Chuanhong Guo
dcf7285b71 mediatek: mt7629: disable auxadc in kconfig
manually edit kconfig to disable MT6577_AUXADC

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-30 23:13:33 +08:00
Chuanhong Guo
3816b2231c mediatek: mt7623: disable various input devices
Disable support for joysticks, micee and tablets. There's no actual
driver selected in kconfig, and including kernel support is just a
waste of space. Besides that, I believe nobody wants these on a router.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-30 23:13:33 +08:00
Chuanhong Guo
99cd44487e mediatek: mt7622: add irq for spi-nor controller
Save some CPU from unnecessary polling and make SPI flash reading
a tiny bit faster.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-30 23:13:33 +08:00
Daniel Golle
593fe90b53
mediatek: remove left-overs from Linux 5.10
Remove patches and configuration for Linux 5.10 which have been left
in the tree despite the target having been switched to Linux 5.15.

Fixes: c283defa88 ("mediatek: switch to 5.15")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-04-30 16:00:24 +01:00
Daniel Golle
eb96f1413a
mediatek: enable multi-core scheduling
Set CONFIG_SCHED_MC in config-5.15 to have make the scheduler aware
of shared caches.

Reported-by: Rui Salvaterra <rsalvaterra@gmail.com>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-04-30 16:00:19 +01:00
Daniel Golle
9b4041fa2e
mediatek: refresh patches for Linux 5.15
Run `make target/linux/refresh` to align patches with OpenWrt style.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-04-30 16:00:15 +01:00
Daniel Golle
5d135fcf9d
mediatek: backport recent DTS improvements for MT7622 SoC
Daniel Golle:
 190-arm64-dts-mediatek-mt7622-fix-GICv2-range.patch

Rui Salvaterra:
 191-arm64-dts-mt7622-specify-the-L2-cache-topology.patch
 192-arm64-dts-mt7622-specify-the-number-of-DMA-requests.patch

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-04-30 16:00:10 +01:00
Chuanhong Guo
852126680e mediatek: mt7629: disable mtk thermal
Manually edit kconfig to disable CONFIG_MTK_THERMAL

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-29 11:47:04 +08:00
Chuanhong Guo
5de8c3dc1f mediatek: mt7623: disable ecc engine support
There's no board using nand on this target atm.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-29 11:32:51 +08:00
Chuanhong Guo
b2d802f839 mediatek: mt7623 enable arch-timer with a patch
Last attempt on this has a typo and doen't work.
It seems that this is a common problem occurring on every kernel bump,
so let's enforce arch timer support for mt7623 with a patch instead.

Fixes: 9a22943eb2 ("mediatek: 5.15: re-enable arch timer on MT7623 as well")
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-29 11:32:28 +08:00
Chuanhong Guo
c283defa88 mediatek: switch to 5.15
the SPI-NAND driver switch breaks dts compatibility. It's too much work
to backport all ECC framework support to 5.10 so let's switch the target
to 5.15 instead.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-28 21:57:18 +08:00
Chuanhong Guo
6470018c57 mediatek: enable snfi for mt7629
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-28 21:57:18 +08:00
Chuanhong Guo
fe079b7e0e mediatek: restore support for Fidelix FM35X1GA
This patch was dropped when the spi-nand driver got replaced last time.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-28 21:57:06 +08:00
Chuanhong Guo
68d5efaa10 mediatek: add an upstreamed spi-nand driver
This patch implements the spi-nand controller driver as an ECC-capable
spi-mem controller to use the upstream SPI-NAND driver.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-28 18:06:00 +08:00
Chuanhong Guo
2138956bdc mediatek: spi-nand: check for 1 byte BBM only
the OOB layout in MTK SNFI uses the 2nd byte, and anything using OOB
will make the block a bad-block in spi-nand driver.
Hack it for now. We need a proper solution upstream.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-28 18:06:00 +08:00
Chuanhong Guo
861efe158a mediatek: v5.15: backport spi-mem ecc support
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-28 18:06:00 +08:00
Chuanhong Guo
3e5925225e mediatek: drop spi-nand driver from mtk
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-28 18:06:00 +08:00
Daniel Golle
fc245338d6
mediatek: mt7622: remove '0x' prefix from pstore address in dts
Adresses of device tree nodes are typically noted without the '0x'
prefix. While having the '0x' prefix doesn't hurt when using Linux,
more recent versions of U-Boot will add a duplicate ramoops node as a
simple string compare is used to check if the node is already present.

Remove the '0x' prefix to avoid the kernel warning resulting from
U-Boot adding a dupplicate pstore/ramoops node.

See also https://lists.denx.de/pipermail/u-boot/2022-April/481810.html

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-04-19 17:07:23 +01:00
Eneas U de Queiroz
3f2d0703b6 mediatek: remove crypto-hw-mtk package
The MediaTek's Crypto Engine module is only available for mt7623, in
which case it is built into the kernel.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
2022-04-19 19:05:32 +08:00
Daniel Golle
9a22943eb2
mediatek: 5.15: re-enable arch timer on MT7623 as well
Re-enable arch timer also on MT7623, yet another time.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-04-14 07:34:50 +01:00
Chuanhong Guo
e30424112e mediatek: 5.15: enable arm arch timer for mt7629
otherwise the system delay is completely broken.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-14 13:35:12 +08:00
Eneas U de Queiroz
c9c2b01b84 mediatek/mt7622: enable accelerated crypto drivers
Use ARMv8 Crypto Extensions for AES, ghash and sha256.

This results in a 16 times speed gain in speed for aes-128-ctr, 17x in
aes-128-gcm, and 9 times in sha256.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
2022-04-11 20:25:34 +01:00
John Audia
b92ec82235 kernel: bump 5.10 to 5.10.110
Removed upstreamed:
  generic/backport-5.10/350-v5.18-MIPS-pgalloc-fix-memory-leak-caused-by-pgd_free.patch
  generic/pending-5.10/850-0014-PCI-aardvark-Fix-reading-PCI_EXP_RTSTA_PME-bit-on-em.patch
  ipq40xx/patches-5.10/105-ipq40xx-fix-sleep-clock.patch

All patches automatically rebased.

Build system: x86_64
Build-tested: bcm2711/RPi4B, mt7622/RT3200
Run-tested: bcm2711/RPi4B, mt7622/RT3200
Compile-/run-tested: ath79/generic (Archer C7 v2).

Signed-off-by: John Audia <graysky@archlinux.us>
2022-04-09 19:31:46 +02:00
Rui Salvaterra
be381a7ac7 kernel: bump 5.15 to 5.15.33
Deleted (upstreamed):
generic/backport-5.15/350-v5.18-MIPS-pgalloc-fix-memory-leak-caused-by-pgd_free.patch [1]
generic/backport-5.15/730-v5.16-hv-utils-add-PTP_1588_CLOCK-to-Kconfig-to-fix-build.patch [2]
generic/pending-5.15/850-0014-PCI-aardvark-Fix-reading-PCI_EXP_RTSTA_PME-bit-on-em.patch [3]
generic/pending-5.15/850-0002-PCI-aardvark-Fix-reading-MSI-interrupt-number.patch [4]

Manually rebased:
generic/pending-5.15/850-0002-PCI-aardvark-Fix-reading-MSI-interrupt-number.patch
ramips/patches-5.15/710-at803x.patch

[1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.15.33&id=d29cda15cab086d82d692de016f7249545d4b6b4
[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.15.33&id=d5aad7d63b1b5c1f3c4b69e12c05e7c7d196fae8
[3] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.15.33&id=ed750e22e44366e264bcdf7b1cf0713f08f7980a
[4] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.15.33&id=0fe94b84c43cfea867e1721606185e8686d7d32f

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
[Refresh patches again]
[Remove generic/pending-5.15/850-0002-PCI-aardvark-Fix-reading-MSI-interrupt-number.patch]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
2022-04-09 19:31:46 +02:00
Aleksander Jan Bajkowski
a98ded6c5c kernel: move some symbols to generic config
This commit add some enabled symbols to generic config.
LTO is only supported by clang compiler and therefore should
be disabled in the generic config instead of duplicating this
symbol in each target. CONFIG_LTO_NONE do this job.

The second group of symbols is enabled by the options available
in the generic config and is therefore added here:
* CONFIG_AF_UNIX_OOB is selected by CONFIG_NET && CONFIG_UNIX,
* CONFIG_BINARY_PRINTF is selected by CONFIG_BPF_SYSCALL,
* CONFIG_NET_SOCK_MSG is selected by CONFIG_BPF_SYSCALL && CONFIG_NET.

The other symbols are disabled and should be in the generic config.

This commit also removes these symbols from subtargets.

Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
2022-04-09 19:31:46 +02:00
John Audia
c41da167d2 kernel: bump 5.10 to 5.10.109
All patches automatically rebased.

Build system: x86_64
Build-tested: bcm2711/RPi4B, mt7622/RT3200
Run-tested: bcm2711/RPi4B, mt7622/RT3200

Signed-off-by: John Audia <graysky@archlinux.us>
2022-03-30 18:33:38 +02:00
Daniel Golle
c3029f3652
mediatek: add 5.15 config for mt7623 and mt7629
Compile tested both with all kernel modules.
Run-time tested mt7623 on BananaPi-R2.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-03-27 14:51:04 +01:00
Felix Fietkau
ade563ba84 mediatek: add patches for 5.15 and kernel config for mt7622
Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-03-27 12:55:53 +02:00
Felix Fietkau
0f029b3d2b mediatek: add patches for MT7622 WED (wireless ethernet dispatch)
This series also contains other improvement for hardware flow offload support

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-03-27 12:54:38 +02:00
Ansuel Smith
07b92c636a generic: 5.15: refresh config
Refresh kernel 5.15 generic config file

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
[added some missing Kconfig symbols]
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-03-27 02:17:24 +01:00
Felix Fietkau
fdbb468c59 ramips/mediatek: enable threaded NAPI in the ethernet driver
Improves performance, especially under load

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-03-21 21:07:14 +01:00
Richard Huynh
9f9477b275 mediatek: Add support for Xiaomi Redmi Router AX6S
Also known as the "Xiaomi Router AX3200" in western markets,
but only the AX6S is widely installation-capable at this time.

SoC: MediaTek MT7622B
RAM: DDR3 256 MiB (ESMT M15T2G16128A)
Flash: SPI-NAND 128 MiB (ESMT F50L1G41LB or Gigadevice GD5F1GQ5xExxG)
WLAN: 2.4/5 GHz 4T4R
2.4 GHz: MediaTek MT7622B
5 GHz: MediaTek MT7915E
Ethernet: 4x 10/100/1000 Mbps
Switch: MediaTek MT7531B
LEDs/Keys: 2/2 (Internet + System LED, Mesh button + Reset pin)
UART: Marked J1 on board VCC RX GND TX, beginning from "1". 3.3v, 115200n8
Power: 12 VDC, 1.5 A

Notes:
U-Boot passes through the ethaddr from uboot-env partition,
but also has been known to reset it to a generic mac address
hardcoded in the bootloader.

However, bdata is also populated with the ethernet mac addresses,
but is also typically never written to. Thus this is used instead.

Installation:
1. Flash stock Xiaomi "closed beta" image labelled
'miwifi_rb03_firmware_stable_1.2.7_closedbeta.bin'.
(MD5: 5eedf1632ac97bb5a6bb072c08603ed7)

2. Calculate telnet password from serial number and login

3. Execute commands to prepare device
nvram set ssh_en=1
nvram set uart_en=1
nvram set boot_wait=on
nvram set flag_boot_success=1
nvram set flag_try_sys1_failed=0
nvram set flag_try_sys2_failed=0
nvram commit

4. Download and flash image
On computer:
python -m http.server
On router:
cd /tmp
wget http://<IP>:8000/factory.bin
mtd -r write factory.bin firmware

Device should reboot at this point.

Reverting to stock:
Stock Xiaomi recovery tftp that accepts their signed images,
with default ips of 192.168.31.1 + 192.168.31.100.
Stock image should be renamed to tftp server ip in hex (Eg. C0A81F64.img)
Triggered by holding reset pin on powerup.

A simple implementation of this would be via dnsmasq's
dhcp-boot option or using the vendor's (Windows only)
recovery tool available on their website.

Signed-off-by: Richard Huynh <voxlympha@gmail.com>
2022-03-20 18:33:39 +00:00
Richard Huynh
4177de10df mediatek: Add GD5F1GQ5xExxG to mtk-snand
Some units of the Xiaomi Redmi Router AX6S/Xiaomi Router AX3200 contain this part.

Signed-off-by: Richard Huynh <voxlympha@gmail.com>
2022-03-20 18:33:39 +00:00
INAGAKI Hiroshi
cc49abc06b kernel: move parser_trx patches of custom magic to generic
This patch moves the patches of parser_trx in mediatek target to
generic/backport-5.10 to use the changes from ramips target and
backport the additional patch of the parser.

Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
2022-03-06 20:40:07 +01:00
Langhua Ye
ce8a33b021 mediatek: add support for Ruijie RG-EW3200GX PRO
X32 Pro is another product  name for it in the Chinese market.

Specifications:
- SoC: MT7622B
- RAM: 256MB
- Flash: XMC XM25QH128C or Winbond WQ25Q128JVSQ 16MB SPI NOR
- Ethernet: 5x1GbE
- Switch: MT7531BE
- WiFi: 2.4G: MT7622 5G: MT7915AN+MT7975AN
- 3LEDs: System LED(blue) + Mesh LED(green) + Mesh LED(red)
- 2Keys: Mesh button + Reset button
- UART: Marked J19 on board. 3.3v, 115200n1
- Power: 12V 2.5A

MAC addresses as verified by OEM firmware:
use   address    source
WAN   *:F4       ethaddr@product_info
LAN   *:F5
5g    *:F6
2g    *:F7

Flash instruction:
1. Serve the initramfs.img using a TFTP server with address 10.10.10.3.
2. Interrupt the uboot startup process via UART.
3. Select "System Load Linux to SDRAM via TFTP" item.
4. (important) Back up firmware(mtd7) partitions with:
        dd if=/dev/mtd7 of=/tmp/firmware.bin
   and then download the firmware.bin image via SCP.
5. Flash the OpenWrt sysupgrade firmware.

Recovery stock firmware:
1. Transfer the firmware.bin image to the device.
2. Flash the image with:
        mtd write firmware.bin firmware

Signed-off-by: Langhua Ye <y1248289414@outlook.com>
2022-03-05 21:06:35 +01:00
Rui Salvaterra
8235723c78 kernel: 5.10: remove CONFIG_DEVTMPFS{,_MOUNT} from kconfigs
They are required for container support, but are handled in Config-kernel.in.

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
2022-03-01 22:57:40 +00:00
Rui Salvaterra
72d2c54ccb kernel: 5.10: allocate last level PTEs in high memory
Enable support for allocating user space page table entries in high memory [1],
for the targets which support this feature. This saves precious low memory
(permanently mapped, the only type of memory directly accessible by the kernel).

[1] https://www.kernel.org/doc/html/latest/vm/highmem.html

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
2022-03-01 22:57:34 +00:00