6b5bc77c9b
Stefan thinks they don't add value. Command used: sed -i -e '/file is part of /d' $(git grep "file is part of " |egrep ":( */\*.*\*/\$|#|;#|-- | *\* )" | cut -d: -f1 |grep -v crossgcc |grep -v gcov | grep -v /elf.h |grep -v nvramtool) The exceptions are for: - crossgcc (patch file) - gcov (imported from gcc) - elf.h (imported from GNU's libc) - nvramtool (more complicated header) The removed lines are: - fmt.Fprintln(f, "/* This file is part of the coreboot project. */") -# This file is part of a set of unofficial pre-commit hooks available -/* This file is part of coreboot */ -# This file is part of msrtool. -/* This file is part of msrtool. */ - * This file is part of ncurses, designed to be appended after curses.h.in -/* This file is part of pgtblgen. */ - * This file is part of the coreboot project. - /* This file is part of the coreboot project. */ -# This file is part of the coreboot project. -# This file is part of the coreboot project. -## This file is part of the coreboot project. --- This file is part of the coreboot project. -/* This file is part of the coreboot project */ -/* This file is part of the coreboot project. */ -;## This file is part of the coreboot project. -# This file is part of the coreboot project. It originated in the - * This file is part of the coreinfo project. -## This file is part of the coreinfo project. - * This file is part of the depthcharge project. -/* This file is part of the depthcharge project. */ -/* This file is part of the ectool project. */ - * This file is part of the GNU C Library. - * This file is part of the libpayload project. -## This file is part of the libpayload project. -/* This file is part of the Linux kernel. */ -## This file is part of the superiotool project. -/* This file is part of the superiotool project */ -/* This file is part of uio_usbdebug */ Change-Id: I82d872b3b337388c93d5f5bf704e9ee9e53ab3a9 Signed-off-by: Patrick Georgi <pgeorgi@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/41194 Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#include <random.h>
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/*
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* Intel recommends that applications attempt 10 retries in a tight loop
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* in the unlikely event that the RDRAND instruction does not successfully
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* return a random number. The odds of ten failures in a row would in fact
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* be an indication of a larger CPU issue.
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*/
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#define RDRAND_RETRY_LOOPS 10
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/*
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* Generate a 32-bit random number through RDRAND instruction.
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* Carry flag is set on RDRAND success and 0 on failure.
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*/
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static inline uint8_t rdrand_32(uint32_t *rand)
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{
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uint8_t carry;
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__asm__ __volatile__(
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".byte 0x0f; .byte 0xc7; .byte 0xf0; setc %1"
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: "=a" (*rand), "=qm" (carry));
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return carry;
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}
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#if ENV_X86_64
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/*
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* Generate a 64-bit random number through RDRAND instruction.
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* Carry flag is set on RDRAND success and 0 on failure.
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*/
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static inline uint8_t rdrand_64(uint64_t *rand)
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{
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uint8_t carry;
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__asm__ __volatile__(
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".byte 0x48; .byte 0x0f; .byte 0xc7; .byte 0xf0; setc %1"
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: "=a" (*rand), "=qm" (carry));
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return carry;
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}
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#endif
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int get_random_number_32(uint32_t *rand)
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{
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int i;
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/* Perform a loop call until RDRAND succeeds or returns failure. */
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for (i = 0; i < RDRAND_RETRY_LOOPS; i++) {
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if (rdrand_32(rand))
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return 0;
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}
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return -1;
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}
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int get_random_number_64(uint64_t *rand)
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{
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int i;
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uint32_t rand_high, rand_low;
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/* Perform a loop call until RDRAND succeeds or returns failure. */
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for (i = 0; i < RDRAND_RETRY_LOOPS; i++) {
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#if ENV_X86_64
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if (rdrand_64(rand))
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return 0;
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#endif
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if (rdrand_32(&rand_high) && rdrand_32(&rand_low)) {
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*rand = ((uint64_t)rand_high << 32) |
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(uint64_t)rand_low;
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return 0;
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}
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}
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return -1;
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}
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