misc.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * arch/sh/boot/compressed/misc.c
  4 *
  5 * This is a collection of several routines from gzip-1.0.3
  6 * adapted for Linux.
  7 *
  8 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
  9 *
 10 * Adapted for SH by Stuart Menefy, Aug 1999
 11 *
 12 * Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000
 13 */
 14
 15#include <linux/uaccess.h>
 16#include <asm/addrspace.h>
 17#include <asm/page.h>
 18
 19#include "misc.h"
 20
 21/*
 22 * gzip declarations
 23 */
 24
 25#define STATIC static
 26
 27#undef memset
 28#undef memcpy
 29#define memzero(s, n)     memset ((s), 0, (n))
 30
 31extern char input_data[];
 32extern int input_len;
 33static unsigned char *output;
 34
 35static void error(char *m);
 36
 37int puts(const char *);
 38
 39extern int _text;		/* Defined in vmlinux.lds.S */
 40extern int _end;
 41static unsigned long free_mem_ptr;
 42static unsigned long free_mem_end_ptr;
 43
 44#ifdef CONFIG_HAVE_KERNEL_BZIP2
 45#define HEAP_SIZE	0x400000
 46#else
 47#define HEAP_SIZE	0x10000
 48#endif
 49
 50#ifdef CONFIG_KERNEL_GZIP
 51#include "../../../../lib/decompress_inflate.c"
 52#endif
 53
 54#ifdef CONFIG_KERNEL_BZIP2
 55#include "../../../../lib/decompress_bunzip2.c"
 56#endif
 57
 58#ifdef CONFIG_KERNEL_LZMA
 59#include "../../../../lib/decompress_unlzma.c"
 60#endif
 61
 62#ifdef CONFIG_KERNEL_XZ
 63#include "../../../../lib/decompress_unxz.c"
 64#endif
 65
 66#ifdef CONFIG_KERNEL_LZO
 67#include "../../../../lib/decompress_unlzo.c"
 68#endif
 69
 70int puts(const char *s)
 71{
 72	/* This should be updated to use the sh-sci routines */
 73	return 0;
 74}
 75
 76void* memset(void* s, int c, size_t n)
 77{
 78	int i;
 79	char *ss = (char*)s;
 80
 81	for (i=0;i<n;i++) ss[i] = c;
 82	return s;
 83}
 84
 85void* memcpy(void* __dest, __const void* __src,
 86			    size_t __n)
 87{
 88	int i;
 89	char *d = (char *)__dest, *s = (char *)__src;
 90
 91	for (i=0;i<__n;i++) d[i] = s[i];
 92	return __dest;
 93}
 94
 95static void error(char *x)
 96{
 97	puts("\n\n");
 98	puts(x);
 99	puts("\n\n -- System halted");
100
101	while(1);	/* Halt */
102}
103
104const unsigned long __stack_chk_guard = 0x000a0dff;
105
106void __stack_chk_fail(void)
107{
108	error("stack-protector: Kernel stack is corrupted\n");
109}
110
111/* Needed because vmlinux.lds.h references this */
112void ftrace_stub(void)
113{
114}
115void arch_ftrace_ops_list_func(void)
116{
117}
118
119#define stackalign	4
120
121#define STACK_SIZE (4096)
122long __attribute__ ((aligned(stackalign))) user_stack[STACK_SIZE];
123long *stack_start = &user_stack[STACK_SIZE];
124
125void decompress_kernel(void)
126{
127	unsigned long output_addr;
128
129	output_addr = __pa((unsigned long)&_text+PAGE_SIZE);
130#if defined(CONFIG_29BIT)
131	output_addr |= P2SEG;
132#endif
133
134	output = (unsigned char *)output_addr;
135	free_mem_ptr = (unsigned long)&_end;
136	free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
137
138	puts("Uncompressing Linux... ");
139	__decompress(input_data, input_len, NULL, NULL, output, 0, NULL, error);
140	puts("Ok, booting the kernel.\n");
141}