2 * Definitions and wrapper functions for kernel decompressor
4 * Copyright IBM Corp. 2010
6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
9 #include <asm/uaccess.h>
22 #define memzero(s, n) memset((s), 0, (n))
24 /* Symbols defined by linker scripts */
25 extern char input_data[];
27 extern char _text, _end;
28 extern char _bss, _ebss;
30 static void error(char *m);
32 static unsigned long free_mem_ptr;
33 static unsigned long free_mem_end_ptr;
35 #ifdef CONFIG_HAVE_KERNEL_BZIP2
36 #define HEAP_SIZE 0x400000
38 #define HEAP_SIZE 0x10000
41 #ifdef CONFIG_KERNEL_GZIP
42 #include "../../../../lib/decompress_inflate.c"
45 #ifdef CONFIG_KERNEL_BZIP2
46 #include "../../../../lib/decompress_bunzip2.c"
49 #ifdef CONFIG_KERNEL_LZMA
50 #include "../../../../lib/decompress_unlzma.c"
53 extern _sclp_print_early(const char *);
55 int puts(const char *s)
61 void *memset(void *s, int c, size_t n)
66 return __builtin_memset(s, 0, n);
76 void *memcpy(void *__dest, __const void *__src, size_t __n)
78 return __builtin_memcpy(__dest, __src, __n);
81 void *memmove(void *__dest, __const void *__src, size_t __n)
87 return __builtin_memcpy(__dest, __src, __n);
95 static void error(char *x)
97 unsigned long long psw = 0x000a0000deadbeefULL;
101 puts("\n\n -- System halted");
103 asm volatile("lpsw %0" : : "Q" (psw));
107 * Safe guard the ipl parameter block against a memory area that will be
108 * overwritten. The validity check for the ipl parameter block is complex
109 * (see cio_get_iplinfo and ipl_save_parameters) but if the pointer to
110 * the ipl parameter block intersects with the passed memory area we can
111 * safely assume that we can read from that memory. In that case just copy
112 * the memory to IPL_PARMBLOCK_ORIGIN even if there is no ipl parameter
115 static void check_ipl_parmblock(void *start, unsigned long size)
119 src = (void *)(unsigned long) S390_lowcore.ipl_parmblock_ptr;
120 if (src + PAGE_SIZE <= start || src >= start + size)
122 dst = (void *) IPL_PARMBLOCK_ORIGIN;
123 memmove(dst, src, PAGE_SIZE);
124 S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
127 unsigned long decompress_kernel(void)
129 unsigned long output_addr;
130 unsigned char *output;
132 check_ipl_parmblock((void *) 0, (unsigned long) output + SZ__bss_start);
133 memset(&_bss, 0, &_ebss - &_bss);
134 free_mem_ptr = (unsigned long)&_end;
135 free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
136 output = (unsigned char *) ((free_mem_end_ptr + 4095UL) & -4096UL);
138 #ifdef CONFIG_BLK_DEV_INITRD
140 * Move the initrd right behind the end of the decompressed
143 if (INITRD_START && INITRD_SIZE &&
144 INITRD_START < (unsigned long) output + SZ__bss_start) {
145 check_ipl_parmblock(output + SZ__bss_start,
146 INITRD_START + INITRD_SIZE);
147 memmove(output + SZ__bss_start,
148 (void *) INITRD_START, INITRD_SIZE);
149 INITRD_START = (unsigned long) output + SZ__bss_start;
153 puts("Uncompressing Linux... ");
154 decompress(input_data, input_len, NULL, NULL, output, NULL, error);
155 puts("Ok, booting the kernel.\n");
156 return (unsigned long) output;