/* * (C) 2003 Bruno Ducrot * (C) 2004 Dominik Brodowski * * 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 */ #include #include #include 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; } 6ee7c05a88e4996e8177f91b'>diff
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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2017-02-03 17:10:28 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2017-02-08 23:36:29 +1100
commitd7df2443cd5f67fc6ee7c05a88e4996e8177f91b (patch)
tree098a7c0ca4fceb8a65cb1f693c9d71990388933d /tools/build/feature/test-bpf.c
parenta0615a16f7d0ceb5804d295203c302d496d8ee91 (diff)
powerpc/mm: Fix spurrious segfaults on radix with autonuma
When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it clears all the protection bits but leave the PTE valid. With the Radix MMU, an attempt at executing from such a PTE will take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G". It is thus incorrect to treat all such faults as errors. We should pass them to handle_mm_fault() for autonuma to deal with. The case of pages that are really not executable is handled by the existing test for VM_EXEC further down. That leaves us with catching the kernel attempts at executing user pages. We can catch that earlier, even before we do find_vma. It is never valid on powerpc for the kernel to take an exec fault to begin with. So fold that test with the existing test for the kernel faulting on kernel addresses to bail out early. Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report") Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools/build/feature/test-bpf.c')