cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

wii.c (3008B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * arch/powerpc/boot/wii.c
      4 *
      5 * Nintendo Wii bootwrapper support
      6 * Copyright (C) 2008-2009 The GameCube Linux Team
      7 * Copyright (C) 2008,2009 Albert Herranz
      8 */
      9
     10#include <stddef.h>
     11#include "stdio.h"
     12#include "types.h"
     13#include "io.h"
     14#include "ops.h"
     15
     16#include "ugecon.h"
     17
     18BSS_STACK(8192);
     19
     20#define HW_REG(x)		((void *)(x))
     21
     22#define EXI_CTRL		HW_REG(0x0d800070)
     23#define EXI_CTRL_ENABLE		(1<<0)
     24
     25#define MEM2_TOP		(0x10000000 + 64*1024*1024)
     26#define FIRMWARE_DEFAULT_SIZE	(12*1024*1024)
     27
     28
     29struct mipc_infohdr {
     30	char magic[3];
     31	u8 version;
     32	u32 mem2_boundary;
     33	u32 ipc_in;
     34	size_t ipc_in_size;
     35	u32 ipc_out;
     36	size_t ipc_out_size;
     37};
     38
     39static int mipc_check_address(u32 pa)
     40{
     41	/* only MEM2 addresses */
     42	if (pa < 0x10000000 || pa > 0x14000000)
     43		return -EINVAL;
     44	return 0;
     45}
     46
     47static struct mipc_infohdr *mipc_get_infohdr(void)
     48{
     49	struct mipc_infohdr **hdrp, *hdr;
     50
     51	/* 'mini' header pointer is the last word of MEM2 memory */
     52	hdrp = (struct mipc_infohdr **)0x13fffffc;
     53	if (mipc_check_address((u32)hdrp)) {
     54		printf("mini: invalid hdrp %08X\n", (u32)hdrp);
     55		hdr = NULL;
     56		goto out;
     57	}
     58
     59	hdr = *hdrp;
     60	if (mipc_check_address((u32)hdr)) {
     61		printf("mini: invalid hdr %08X\n", (u32)hdr);
     62		hdr = NULL;
     63		goto out;
     64	}
     65	if (memcmp(hdr->magic, "IPC", 3)) {
     66		printf("mini: invalid magic\n");
     67		hdr = NULL;
     68		goto out;
     69	}
     70
     71out:
     72	return hdr;
     73}
     74
     75static int mipc_get_mem2_boundary(u32 *mem2_boundary)
     76{
     77	struct mipc_infohdr *hdr;
     78	int error;
     79
     80	hdr = mipc_get_infohdr();
     81	if (!hdr) {
     82		error = -1;
     83		goto out;
     84	}
     85
     86	if (mipc_check_address(hdr->mem2_boundary)) {
     87		printf("mini: invalid mem2_boundary %08X\n",
     88		       hdr->mem2_boundary);
     89		error = -EINVAL;
     90		goto out;
     91	}
     92	*mem2_boundary = hdr->mem2_boundary;
     93	error = 0;
     94out:
     95	return error;
     96
     97}
     98
     99static void platform_fixups(void)
    100{
    101	void *mem;
    102	u32 reg[4];
    103	u32 mem2_boundary;
    104	int len;
    105	int error;
    106
    107	mem = finddevice("/memory");
    108	if (!mem)
    109		fatal("Can't find memory node\n");
    110
    111	/* two ranges of (address, size) words */
    112	len = getprop(mem, "reg", reg, sizeof(reg));
    113	if (len != sizeof(reg)) {
    114		/* nothing to do */
    115		goto out;
    116	}
    117
    118	/* retrieve MEM2 boundary from 'mini' */
    119	error = mipc_get_mem2_boundary(&mem2_boundary);
    120	if (error) {
    121		/* if that fails use a sane value */
    122		mem2_boundary = MEM2_TOP - FIRMWARE_DEFAULT_SIZE;
    123	}
    124
    125	if (mem2_boundary > reg[2] && mem2_boundary < reg[2] + reg[3]) {
    126		reg[3] = mem2_boundary - reg[2];
    127		printf("top of MEM2 @ %08X\n", reg[2] + reg[3]);
    128		setprop(mem, "reg", reg, sizeof(reg));
    129	}
    130
    131out:
    132	return;
    133}
    134
    135void platform_init(unsigned long r3, unsigned long r4, unsigned long r5)
    136{
    137	u32 heapsize = 24*1024*1024 - (u32)_end;
    138
    139	simple_alloc_init(_end, heapsize, 32, 64);
    140	fdt_init(_dtb_start);
    141
    142	/*
    143	 * 'mini' boots the Broadway processor with EXI disabled.
    144	 * We need it enabled before probing for the USB Gecko.
    145	 */
    146	out_be32(EXI_CTRL, in_be32(EXI_CTRL) | EXI_CTRL_ENABLE);
    147
    148	if (ug_probe())
    149		console_ops.write = ug_console_write;
    150
    151	platform_ops.fixups = platform_fixups;
    152}
    153