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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sniprom.c (3874B)

      1/*
      2 * Big Endian PROM code for SNI RM machines
      3 *
      4 * This file is subject to the terms and conditions of the GNU General Public
      5 * License.  See the file "COPYING" in the main directory of this archive
      6 * for more details.
      7 *
      8 * Copyright (C) 2005-2006 Florian Lohoff (flo@rfc822.org)
      9 * Copyright (C) 2005-2006 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
     10 */
     11
     12#include <linux/kernel.h>
     13#include <linux/init.h>
     14#include <linux/memblock.h>
     15#include <linux/string.h>
     16#include <linux/console.h>
     17
     18#include <asm/addrspace.h>
     19#include <asm/sni.h>
     20#include <asm/mipsprom.h>
     21#include <asm/mipsregs.h>
     22#include <asm/bootinfo.h>
     23#include <asm/setup.h>
     24
     25/* special SNI prom calls */
     26/*
     27 * This does not exist in all proms - SINIX compares
     28 * the prom env variable "version" against "2.0008"
     29 * or greater. If lesser it tries to probe interesting
     30 * registers
     31 */
     32#define PROM_GET_MEMCONF	58
     33#define PROM_GET_HWCONF		61
     34
     35#define PROM_VEC		(u64 *)CKSEG1ADDR(0x1fc00000)
     36#define PROM_ENTRY(x)		(PROM_VEC + (x))
     37
     38#define ___prom_putchar		((int *(*)(int))PROM_ENTRY(PROM_PUTCHAR))
     39#define ___prom_getenv		((char *(*)(char *))PROM_ENTRY(PROM_GETENV))
     40#define ___prom_get_memconf	((void (*)(void *))PROM_ENTRY(PROM_GET_MEMCONF))
     41#define ___prom_get_hwconf	((u32 (*)(void))PROM_ENTRY(PROM_GET_HWCONF))
     42
     43#ifdef CONFIG_64BIT
     44
     45/* O32 stack has to be 8-byte aligned. */
     46static u64 o32_stk[4096];
     47#define O32_STK	  (&o32_stk[ARRAY_SIZE(o32_stk)])
     48
     49#define __PROM_O32(fun, arg) fun arg __asm__(#fun); \
     50				     __asm__(#fun " = call_o32")
     51
     52int   __PROM_O32(__prom_putchar, (int *(*)(int), void *, int));
     53char *__PROM_O32(__prom_getenv, (char *(*)(char *), void *, char *));
     54void  __PROM_O32(__prom_get_memconf, (void (*)(void *), void *, void *));
     55u32   __PROM_O32(__prom_get_hwconf, (u32 (*)(void), void *));
     56
     57#define _prom_putchar(x)     __prom_putchar(___prom_putchar, O32_STK, x)
     58#define _prom_getenv(x)	     __prom_getenv(___prom_getenv, O32_STK, x)
     59#define _prom_get_memconf(x) __prom_get_memconf(___prom_get_memconf, O32_STK, x)
     60#define _prom_get_hwconf()   __prom_get_hwconf(___prom_get_hwconf, O32_STK)
     61
     62#else
     63#define _prom_putchar(x)     ___prom_putchar(x)
     64#define _prom_getenv(x)	     ___prom_getenv(x)
     65#define _prom_get_memconf(x) ___prom_get_memconf(x)
     66#define _prom_get_hwconf(x)  ___prom_get_hwconf(x)
     67#endif
     68
     69void prom_putchar(char c)
     70{
     71	_prom_putchar(c);
     72}
     73
     74
     75char *prom_getenv(char *s)
     76{
     77	return _prom_getenv(s);
     78}
     79
     80void *prom_get_hwconf(void)
     81{
     82	u32 hwconf = _prom_get_hwconf();
     83
     84	if (hwconf == 0xffffffff)
     85		return NULL;
     86
     87	return (void *)CKSEG1ADDR(hwconf);
     88}
     89
     90/*
     91 * /proc/cpuinfo system type
     92 *
     93 */
     94char *system_type = "Unknown";
     95const char *get_system_type(void)
     96{
     97	return system_type;
     98}
     99
    100static void __init sni_mem_init(void)
    101{
    102	int i, memsize;
    103	struct membank {
    104		u32		size;
    105		u32		base;
    106		u32		size2;
    107		u32		pad1;
    108		u32		pad2;
    109	} memconf[8];
    110	int brd_type = *(unsigned char *)SNI_IDPROM_BRDTYPE;
    111
    112
    113	/* MemSIZE from prom in 16MByte chunks */
    114	memsize = *((unsigned char *) SNI_IDPROM_MEMSIZE) * 16;
    115
    116	pr_debug("IDProm memsize: %u MByte\n", memsize);
    117
    118	/* get memory bank layout from prom */
    119	_prom_get_memconf(&memconf);
    120
    121	pr_debug("prom_get_mem_conf memory configuration:\n");
    122	for (i = 0; i < 8 && memconf[i].size; i++) {
    123		if (brd_type == SNI_BRD_PCI_TOWER ||
    124		    brd_type == SNI_BRD_PCI_TOWER_CPLUS) {
    125			if (memconf[i].base >= 0x20000000 &&
    126			    memconf[i].base <  0x30000000)
    127				memconf[i].base -= 0x20000000;
    128		}
    129		pr_debug("Bank%d: %08x @ %08x\n", i,
    130			memconf[i].size, memconf[i].base);
    131		memblock_add(memconf[i].base, memconf[i].size);
    132	}
    133}
    134
    135void __init prom_init(void)
    136{
    137	int argc = fw_arg0;
    138	u32 *argv = (u32 *)CKSEG0ADDR(fw_arg1);
    139	int i;
    140
    141	sni_mem_init();
    142
    143	/* copy prom cmdline parameters to kernel cmdline */
    144	for (i = 1; i < argc; i++) {
    145		strcat(arcs_cmdline, (char *)CKSEG0ADDR(argv[i]));
    146		if (i < (argc - 1))
    147			strcat(arcs_cmdline, " ");
    148	}
    149}