/*
 *  (C) 2003  Bruno Ducrot
 *  (C) 2004  Dominik Brodowski <linux@dominikbrodowski.de>
 *
 *  Licensed under the terms of the GNU GPL License version 2.
 *
 * Based on code found in
 * linux/include/asm-i386/ist.h and linux/arch/i386/kernel/setup.c
 * and originally developed by Andy Grover <andrew.grover@intel.com>
 */

#include <stdio.h>
#include <string.h>
#include <lrmi.h>

int main (void)
{
	struct LRMI_regs	r;
	int			retval;

	if (!LRMI_init())
		return 0;

	memset(&r, 0, sizeof(r));

	r.eax = 0x0000E980;
	r.edx = 0x47534943;

	retval = LRMI_int(0x15, &r);

	if (!retval) {
		printf("Failed!\n");
		return 0;
	}
	if (r.eax == 0x47534943) {
		printf("BIOS supports GSIC call:\n");
		printf("\tsignature: %c%c%c%c\n",
		       (r.eax >> 24) & 0xff,
		       (r.eax >> 16) & 0xff,
		       (r.eax >> 8) & 0xff,
		       (r.eax) & 0xff);
		printf("\tcommand port = 0x%.4x\n",
		       r.ebx & 0xffff);
		printf("\tcommand =      0x%.4x\n",
		       (r.ebx >> 16) & 0xffff);
		printf("\tevent port =   0x%.8x\n", r.ecx);
		printf("\tflags =        0x%.8x\n", r.edx);
		if (((r.ebx >> 16) & 0xffff) != 0x82) {
			printf("non-default command value. If speedstep-smi "
			       "doesn't work out of the box,\nyou may want to "
			       "try out the default value by passing "
			       "smi_cmd=0x82 to the module\n ON YOUR OWN "
			       "RISK.\n");
		}
		if ((r.ebx & 0xffff) != 0xb2) {
			printf("non-default command port. If speedstep-smi "
			       "doesn't work out of the box,\nyou may want to "
			       "try out the default value by passing "
			       "smi_port=0x82 to the module\n ON YOUR OWN "
			       "RISK.\n");
		}
	} else {
		printf("BIOS DOES NOT support GSIC call.  Dumping registers anyway:\n");
		printf("eax = 0x%.8x\n", r.eax);
		printf("ebx = 0x%.8x\n", r.ebx);
		printf("ecx = 0x%.8x\n", r.ecx);
		printf("edx = 0x%.8x\n", r.edx);
		printf("Note also that some BIOS do not support the initial "
		       "GSIC call, but the newer\nspeedstep-smi driver may "
		       "work.\nFor this, you need to pass some arguments to "
		       "the speedstep-smi driver:\n");
		printf("\tsmi_cmd=0x?? smi_port=0x?? smi_sig=1\n");
		printf("\nUnfortunately, you have to know what exactly are "
		       "smi_cmd and smi_port, and this\nis system "
		       "dependant.\n");
	}
	return 1;
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=4b3e6f2ef3722f1a6a97b6034ed492c1a21fd4ae&amp;showmsg=1'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools?id=4b3e6f2ef3722f1a6a97b6034ed492c1a21fd4ae&amp;showmsg=1'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/perf?id=4b3e6f2ef3722f1a6a97b6034ed492c1a21fd4ae&amp;showmsg=1'>perf</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/tools/perf?id=4b3e6f2ef3722f1a6a97b6034ed492c1a21fd4ae'>Collapse</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
ipts</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/scripts/perl?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>perl</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/scripts/perl/Perf-Trace-Util?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>Perf-Trace-Util</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/scripts/perl/Perf-Trace-Util/lib?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>lib</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/scripts/perl/Perf-Trace-Util/lib/Perf?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>Perf</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/scripts/perl/Perf-Trace-Util/lib/Perf/Trace?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>Trace</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><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/tools/perf/scripts/perl/Perf-Trace-Util/lib/Perf/Trace?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>c8f325a59cfc718d13a50fbc746ed9b415c25e92</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/perf/scripts/perl/Perf-Trace-Util/lib/Perf/Trace?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>patch</a>)</td></tr>
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<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/scripts/perl/Perf-Trace-Util/lib/Perf/Trace?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>bf29bddf0417a4783da3b24e8c9e017ac649326f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/scripts/perl/Perf-Trace-Util/lib/Perf/Trace?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/?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>Diffstat</a> (limited to 'tools/perf/scripts/perl/Perf-Trace-Util/lib/Perf/Trace')</div><table summary='diffstat' class='diffstat'>