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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of.c (2129B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Copyright (C) Paul Mackerras 1997.
      4 */
      5#include <stdarg.h>
      6#include <stddef.h>
      7#include "types.h"
      8#include "elf.h"
      9#include "string.h"
     10#include "stdio.h"
     11#include "page.h"
     12#include "ops.h"
     13
     14#include "of.h"
     15
     16/* Value picked to match that used by yaboot */
     17#define PROG_START	0x01400000	/* only used on 64-bit systems */
     18#define RAM_END		(512<<20)	/* Fixme: use OF */
     19#define	ONE_MB		0x100000
     20
     21
     22
     23static unsigned long claim_base;
     24
     25void epapr_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
     26			 unsigned long r6, unsigned long r7);
     27
     28static void *of_try_claim(unsigned long size)
     29{
     30	unsigned long addr = 0;
     31
     32	if (claim_base == 0)
     33		claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
     34
     35	for(; claim_base < RAM_END; claim_base += ONE_MB) {
     36#ifdef DEBUG
     37		printf("    trying: 0x%08lx\n\r", claim_base);
     38#endif
     39		addr = (unsigned long) of_claim(claim_base, size, 0);
     40		if (addr != PROM_ERROR)
     41			break;
     42	}
     43	if (addr == 0)
     44		return NULL;
     45	claim_base = PAGE_ALIGN(claim_base + size);
     46	return (void *)addr;
     47}
     48
     49static void of_image_hdr(const void *hdr)
     50{
     51	const Elf64_Ehdr *elf64 = hdr;
     52
     53	if (elf64->e_ident[EI_CLASS] == ELFCLASS64) {
     54		/*
     55		 * Maintain a "magic" minimum address. This keeps some older
     56		 * firmware platforms running.
     57		 */
     58		if (claim_base < PROG_START)
     59			claim_base = PROG_START;
     60	}
     61}
     62
     63static void of_platform_init(unsigned long a1, unsigned long a2, void *promptr)
     64{
     65	platform_ops.image_hdr = of_image_hdr;
     66	platform_ops.malloc = of_try_claim;
     67	platform_ops.exit = of_exit;
     68	platform_ops.vmlinux_alloc = of_vmlinux_alloc;
     69
     70	dt_ops.finddevice = of_finddevice;
     71	dt_ops.getprop = of_getprop;
     72	dt_ops.setprop = of_setprop;
     73
     74	of_console_init();
     75
     76	of_init(promptr);
     77	loader_info.promptr = promptr;
     78	if (a1 && a2 && a2 != 0xdeadbeef) {
     79		loader_info.initrd_addr = a1;
     80		loader_info.initrd_size = a2;
     81	}
     82}
     83
     84void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
     85		   unsigned long r6, unsigned long r7)
     86{
     87	/* Detect OF vs. ePAPR boot */
     88	if (r5)
     89		of_platform_init(r3, r4, (void *)r5);
     90	else
     91		epapr_platform_init(r3, r4, r5, r6, r7);
     92}
     93