cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bootstr_32.c (1340B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * bootstr.c:  Boot string/argument acquisition from the PROM.
      4 *
      5 * Copyright(C) 1995 David S. Miller (davem@caip.rutgers.edu)
      6 */
      7
      8#include <linux/string.h>
      9#include <asm/oplib.h>
     10#include <linux/init.h>
     11
     12#define BARG_LEN  256
     13static char barg_buf[BARG_LEN] = { 0 };
     14static char fetched __initdata = 0;
     15
     16char * __init
     17prom_getbootargs(void)
     18{
     19	int iter;
     20	char *cp, *arg;
     21
     22	/* This check saves us from a panic when bootfd patches args. */
     23	if (fetched) {
     24		return barg_buf;
     25	}
     26
     27	switch (prom_vers) {
     28	case PROM_V0:
     29		cp = barg_buf;
     30		/* Start from 1 and go over fd(0,0,0)kernel */
     31		for (iter = 1; iter < 8; iter++) {
     32			arg = (*(romvec->pv_v0bootargs))->argv[iter];
     33			if (arg == NULL)
     34				break;
     35			while (*arg != 0) {
     36				/* Leave place for space and null. */
     37				if (cp >= barg_buf + BARG_LEN - 2)
     38					/* We might issue a warning here. */
     39					break;
     40				*cp++ = *arg++;
     41			}
     42			*cp++ = ' ';
     43			if (cp >= barg_buf + BARG_LEN - 1)
     44				/* We might issue a warning here. */
     45				break;
     46		}
     47		*cp = 0;
     48		break;
     49	case PROM_V2:
     50	case PROM_V3:
     51		/*
     52		 * V3 PROM cannot supply as with more than 128 bytes
     53		 * of an argument. But a smart bootstrap loader can.
     54		 */
     55		strlcpy(barg_buf, *romvec->pv_v2bootargs.bootargs, sizeof(barg_buf));
     56		break;
     57	default:
     58		break;
     59	}
     60
     61	fetched = 1;
     62	return barg_buf;
     63}