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Linux/arch/sh/boot/compressed/misc.c

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  1 /*
  2  * arch/sh/boot/compressed/misc.c
  3  *
  4  * This is a collection of several routines from gzip-1.0.3
  5  * adapted for Linux.
  6  *
  7  * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
  8  *
  9  * Adapted for SH by Stuart Menefy, Aug 1999
 10  *
 11  * Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000
 12  */
 13 
 14 #include <asm/uaccess.h>
 15 #include <asm/addrspace.h>
 16 #include <asm/page.h>
 17 
 18 /*
 19  * gzip declarations
 20  */
 21 
 22 #define STATIC static
 23 
 24 #undef memset
 25 #undef memcpy
 26 #define memzero(s, n)     memset ((s), 0, (n))
 27 
 28 /* cache.c */
 29 #define CACHE_ENABLE      0
 30 #define CACHE_DISABLE     1
 31 int cache_control(unsigned int command);
 32 
 33 extern char input_data[];
 34 extern int input_len;
 35 static unsigned char *output;
 36 
 37 static void error(char *m);
 38 
 39 int puts(const char *);
 40 
 41 extern int _text;               /* Defined in vmlinux.lds.S */
 42 extern int _end;
 43 static unsigned long free_mem_ptr;
 44 static unsigned long free_mem_end_ptr;
 45 
 46 #ifdef CONFIG_HAVE_KERNEL_BZIP2
 47 #define HEAP_SIZE       0x400000
 48 #else
 49 #define HEAP_SIZE       0x10000
 50 #endif
 51 
 52 #ifdef CONFIG_KERNEL_GZIP
 53 #include "../../../../lib/decompress_inflate.c"
 54 #endif
 55 
 56 #ifdef CONFIG_KERNEL_BZIP2
 57 #include "../../../../lib/decompress_bunzip2.c"
 58 #endif
 59 
 60 #ifdef CONFIG_KERNEL_LZMA
 61 #include "../../../../lib/decompress_unlzma.c"
 62 #endif
 63 
 64 #ifdef CONFIG_KERNEL_XZ
 65 #include "../../../../lib/decompress_unxz.c"
 66 #endif
 67 
 68 #ifdef CONFIG_KERNEL_LZO
 69 #include "../../../../lib/decompress_unlzo.c"
 70 #endif
 71 
 72 int puts(const char *s)
 73 {
 74         /* This should be updated to use the sh-sci routines */
 75         return 0;
 76 }
 77 
 78 void* memset(void* s, int c, size_t n)
 79 {
 80         int i;
 81         char *ss = (char*)s;
 82 
 83         for (i=0;i<n;i++) ss[i] = c;
 84         return s;
 85 }
 86 
 87 void* memcpy(void* __dest, __const void* __src,
 88                             size_t __n)
 89 {
 90         int i;
 91         char *d = (char *)__dest, *s = (char *)__src;
 92 
 93         for (i=0;i<__n;i++) d[i] = s[i];
 94         return __dest;
 95 }
 96 
 97 static void error(char *x)
 98 {
 99         puts("\n\n");
100         puts(x);
101         puts("\n\n -- System halted");
102 
103         while(1);       /* Halt */
104 }
105 
106 #ifdef CONFIG_SUPERH64
107 #define stackalign      8
108 #else
109 #define stackalign      4
110 #endif
111 
112 #define STACK_SIZE (4096)
113 long __attribute__ ((aligned(stackalign))) user_stack[STACK_SIZE];
114 long *stack_start = &user_stack[STACK_SIZE];
115 
116 void decompress_kernel(void)
117 {
118         unsigned long output_addr;
119 
120 #ifdef CONFIG_SUPERH64
121         output_addr = (CONFIG_MEMORY_START + 0x2000);
122 #else
123         output_addr = __pa((unsigned long)&_text+PAGE_SIZE);
124 #if defined(CONFIG_29BIT)
125         output_addr |= P2SEG;
126 #endif
127 #endif
128 
129         output = (unsigned char *)output_addr;
130         free_mem_ptr = (unsigned long)&_end;
131         free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
132 
133         puts("Uncompressing Linux... ");
134         cache_control(CACHE_ENABLE);
135         decompress(input_data, input_len, NULL, NULL, output, NULL, error);
136         cache_control(CACHE_DISABLE);
137         puts("Ok, booting the kernel.\n");
138 }
139 

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