#ifndef TAIA_H
#define TAIA_H

#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/time.h>

#include "rnd.h"

struct tai {
	uint64_t x;
};

struct taia {
	struct tai sec;
	uint32_t nano;
	uint32_t atto;
};

static inline void tai_pack(unsigned char *s, struct tai *t)
{
	uint64_t x;

	x = t->x;

	s[7] = x & 255; x >>= 8;
	s[6] = x & 255; x >>= 8;
	s[5] = x & 255; x >>= 8;
	s[4] = x & 255; x >>= 8;
	s[3] = x & 255; x >>= 8;
	s[2] = x & 255; x >>= 8;
	s[1] = x & 255; x >>= 8;
	s[0] = x;
}

static inline void tai_unpack(unsigned char *s, struct tai *t)
{
	uint64_t x;

	x = (unsigned char) s[0];
	x <<= 8; x += (unsigned char) s[1];
	x <<= 8; x += (unsigned char) s[2];
	x <<= 8; x += (unsigned char) s[3];
	x <<= 8; x += (unsigned char) s[4];
	x <<= 8; x += (unsigned char) s[5];
	x <<= 8; x += (unsigned char) s[6];
	x <<= 8; x += (unsigned char) s[7];

	t->x = x;
}

static inline void taia_pack(unsigned char *s, struct taia *t)
{
	unsigned long x;

	tai_pack(s, &t->sec);

	s += 8;

	x = t->atto;

	s[7] = x & 255; x >>= 8;
	s[6] = x & 255; x >>= 8;
	s[5] = x & 255; x >>= 8;
	s[4] = x;

	x = t->nano;

	s[3] = x & 255; x >>= 8;
	s[2] = x & 255; x >>= 8;
	s[1] = x & 255; x >>= 8;
	s[0] = x;
} 

static inline void taia_unpack(unsigned char *s, struct taia *t)
{
	unsigned long x;

	tai_unpack(s, &t->sec);

	s += 8;

	x = (unsigned char) s[4];
	x <<= 8; x += (unsigned char) s[5];
	x <<= 8; x += (unsigned char) s[6];
	x <<= 8; x += (unsigned char) s[7];

	t->atto = x;

	x = (unsigned char) s[0];
	x <<= 8; x += (unsigned char) s[1];
	x <<= 8; x += (unsigned char) s[2];
	x <<= 8; x += (unsigned char) s[3];

	t->nano = x;
}

#define tai_unix(t, u) \
		((void) ((t)->x = 4611686018427387914ULL + \
				  (uint64_t) (u)))

static inline void taia_now(struct taia *t)
{
	struct timeval now;

	gettimeofday(&now, NULL);

	tai_unix(&t->sec, now.tv_sec);
	t->nano = 1000 * now.tv_usec + 500;
	/* We don't really have it, but bring some noise in. */
	t->atto = secrand();
}

static inline void taia_sub(struct taia *res, const struct taia *u,
			    const struct taia *v)
{
	unsigned long unano = u->nano;
	unsigned long uatto = u->atto;

	res->sec.x = u->sec.x - v->sec.x;
	res->nano = unano - v->nano;
	res->atto = uatto - v->atto;

	if (res->atto > uatto) {
		res->atto += 1000000000UL;
		--res->nano;
	}

	if (res->nano > unano) {
		res->nano += 1000000000UL;
		--res->sec.x;
	}
}

static inline void taia_add(struct taia *res, const struct taia *u,
			    const struct taia *v)
{
	res->sec.x = u->sec.x + v->sec.x;
	res->nano = u->nano + v->nano;
	res->atto = u->atto + v->atto;

	if (res->atto > 999999999UL) {
		res->atto -= 1000000000UL;
		++res->nano;
	}

	if (res->nano > 999999999UL) {
		res->nano -= 1000000000UL;
		++res->sec.x;
	}
}

static inline int taia_less(const struct taia *t, const struct taia *u)
{
	if (t->sec.x < u->sec.x)
		return 1;
	if (t->sec.x > u->sec.x)
		return 0;
	if (t->nano < u->nano)
		return 1;
	if (t->nano > u->nano)
		return 0;
	return t->atto < u->atto;
}

extern bool taia_looks_good(struct taia *arr_taia, struct taia *pkt_taia);

#endif /* TAIA_H */
5c25e92'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound/usb?h=nds-private-remove&amp;id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound/usb/line6?h=nds-private-remove&amp;id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>line6</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='c8f325a59cfc718d13a50fbc746ed9b415c25e92'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;</td><td class='right'>2017-02-01 17:45:02 +0000</td></tr>
<tr><th>committer</th><td>Ingo Molnar &lt;mingo@kernel.org&gt;</td><td class='right'>2017-02-01 21:17:49 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/usb/line6?h=nds-private-remove&amp;id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>c8f325a59cfc718d13a50fbc746ed9b415c25e92</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/usb/line6?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>d53fbdac9d0781e39a13b2ac6b2bd258cf3b4140</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/usb/line6?h=nds-private-remove&amp;id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>sound/usb/line6</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/usb/line6?h=nds-private-remove&amp;id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>bf29bddf0417a4783da3b24e8c9e017ac649326f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/usb/line6?h=nds-private-remove&amp;id=c8f325a59cfc718d13a50fbc746ed9b415c25e92&amp;id2=bf29bddf0417a4783da3b24e8c9e017ac649326f'>diff</a>)</td></tr></table>
<div class='commit-subject'>efi/fdt: Avoid FDT manipulation after ExitBootServices()</div><div class='commit-msg'>Some AArch64 UEFI implementations disable the MMU in ExitBootServices(),
after which unaligned accesses to RAM are no longer supported.

Commit:

  abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel")

fixed an issue in the memory map handling of the stub FDT code, but
inadvertently created an issue with such firmware, by moving some
of the FDT manipulation to after the invocation of ExitBootServices().

Given that the stub's libfdt implementation uses the ordinary, accelerated
string functions, which rely on hardware handling of unaligned accesses,
manipulating the FDT with the MMU off may result in alignment faults.

So fix the situation by moving the update_fdt_memmap() call into the
callback function invoked by efi_exit_boot_services() right before it
calls the ExitBootServices() UEFI service (which is arguably a better
place for it anyway)

Note that disabling the MMU in ExitBootServices() is not compliant with
the UEFI spec, and carries great risk due to the fact that switching from
cached to uncached memory accesses halfway through compiler generated code
(i.e., involving a stack) can never be done in a way that is architecturally
safe.

Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel")
Signed-off-by: Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;
Tested-by: Riku Voipio &lt;riku.voipio@linaro.org&gt;
Cc: &lt;stable@vger.kernel.org&gt;
Cc: mark.rutland@arm.com
Cc: linux-efi@vger.kernel.org
Cc: matt@codeblueprint.co.uk
Cc: leif.lindholm@linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>Diffstat</a> (limited to 'sound/usb/line6')</div><table summary='diffstat' class='diffstat'>