kernels: add linux-libre-aarch64

Some System On a Chip (SOC) have 64bit ARM CPUs that are also
capable of running arm 32bit applications.

Since:
- Parabola doesn't have an aarch64 package repository yet
- The devicetree of devices using such System On a Chip
  are not compiled when using the armv7 defconfig
- Drivers or other platform support code for such hardware
  might also not be compiled in with the armv7 defconfig
- This approach has already been tested with the linux-libre-x86_64
  kenrel

It's then a good idea to add support for such devices by adding
an arrch64 kernel as the maintenance and work is minimal.

The downside is that the external kernel modules that are either
compiled against the kernel or using DKMS will not work by default.

It's however still possible to compile them by hand by using
ARCH= and CROSS_COMPILE= as it is done for this kernel, so it
should be relatively easy to add support for the non-dkms modules.

As for DKMS, someone would need to look into it to understand how
to pass it the make flags (ARCH= and CROSS_COMPILE=) that are
required to automatically build modules.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

1 files changed, 95 insertions, 0 deletions

diff --git a/kernels/linux-libre-arm64/0005-net-smsc95xx-Allow-mac-address-to-be-set-as-a-parame.patch b/kernels/linux-libre-arm64/0005-net-smsc95xx-Allow-mac-address-to-be-set-as-a-parame.patch
new file mode 100644
index 000000000..e95960163
--- /dev/null
+++ b/kernels/linux-libre-arm64/0005-net-smsc95xx-Allow-mac-address-to-be-set-as-a-parame.patch
@@ -0,0 +1,95 @@
+From 585c73f82751043ebcf1e097a29bb9c6d2c3fbd1 Mon Sep 17 00:00:00 2001
+From: popcornmix <popcornmix@gmail.com>
+Date: Tue, 18 Feb 2014 01:43:50 -0300
+Subject: [PATCH 5/9] net/smsc95xx: Allow mac address to be set as a parameter
+
+---
+ drivers/net/usb/smsc95xx.c | 56 ++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 56 insertions(+)
+
+diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
+index 355be77f4241..c94a7193e0b9 100644
+--- a/drivers/net/usb/smsc95xx.c
++++ b/drivers/net/usb/smsc95xx.c
+@@ -48,6 +48,7 @@
+ #define SUSPEND_SUSPEND3		(0x08)
+ #define SUSPEND_ALLMODES		(SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
+ 					 SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
++#define MAC_ADDR_LEN                    (6)
+ 
+ #define CARRIER_CHECK_DELAY (2 * HZ)
+ 
+@@ -70,6 +71,10 @@ static bool turbo_mode = true;
+ module_param(turbo_mode, bool, 0644);
+ MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
+ 
++static char *macaddr = ":";
++module_param(macaddr, charp, 0);
++MODULE_PARM_DESC(macaddr, "MAC address");
++
+ static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
+ 					    u32 *data, int in_pm)
+ {
+@@ -899,8 +904,59 @@ static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
+ 	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
+ }
+ 
++/* Check the macaddr module parameter for a MAC address */
++static int smsc95xx_is_macaddr_param(struct usbnet *dev, u8 *dev_mac)
++{
++       int i, j, got_num, num;
++       u8 mtbl[MAC_ADDR_LEN];
++
++       if (macaddr[0] == ':')
++               return 0;
++
++       i = 0;
++       j = 0;
++       num = 0;
++       got_num = 0;
++       while (j < MAC_ADDR_LEN) {
++               if (macaddr[i] && macaddr[i] != ':') {
++                       got_num++;
++                       if ('0' <= macaddr[i] && macaddr[i] <= '9')
++                               num = num * 16 + macaddr[i] - '0';
++                       else if ('A' <= macaddr[i] && macaddr[i] <= 'F')
++                               num = num * 16 + 10 + macaddr[i] - 'A';
++                       else if ('a' <= macaddr[i] && macaddr[i] <= 'f')
++                               num = num * 16 + 10 + macaddr[i] - 'a';
++                       else
++                               break;
++                       i++;
++               } else if (got_num == 2) {
++                       mtbl[j++] = (u8) num;
++                       num = 0;
++                       got_num = 0;
++                       i++;
++               } else {
++                       break;
++               }
++       }
++
++       if (j == MAC_ADDR_LEN) {
++               netif_dbg(dev, ifup, dev->net, "Overriding MAC address with: "
++               "%02x:%02x:%02x:%02x:%02x:%02x\n", mtbl[0], mtbl[1], mtbl[2],
++                                               mtbl[3], mtbl[4], mtbl[5]);
++               for (i = 0; i < MAC_ADDR_LEN; i++)
++                       dev_mac[i] = mtbl[i];
++               return 1;
++       } else {
++               return 0;
++       }
++}
++
+ static void smsc95xx_init_mac_address(struct usbnet *dev)
+ {
++       /* Check module parameters */
++       if (smsc95xx_is_macaddr_param(dev, dev->net->dev_addr))
++               return;
++
+ 	const u8 *mac_addr;
+ 
+ 	/* maybe the boot loader passed the MAC address in devicetree */
+-- 
+2.23.0
+