1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 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 * Modified for ARM Linux by Russell King 11 * 12 * Nicolas Pitre <nico@visuaide.com> 1999/04/14 : 13 * For this code to run directly from Flash, all constant variables must 14 * be marked with 'const' and all other variables initialized at run-time 15 * only. This way all non constant variables will end up in the bss segment, 16 * which should point to addresses in RAM and cleared to 0 on start. 17 * This allows for a much quicker boot time. 18 */ 19 20 unsigned int __machine_arch_type; 21 22 #include <linux/compiler.h> /* for inline */ 23 #include <linux/types.h> 24 #include <linux/linkage.h> 25 #include "misc.h" 26 #include "misc-ep93xx.h" 27 28 static void putstr(const char *ptr); 29 30 #include CONFIG_UNCOMPRESS_INCLUDE 31 32 #ifdef CONFIG_DEBUG_ICEDCC 33 34 #if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7) 35 36 static void icedcc_putc(int ch) 37 { 38 int status, i = 0x4000000; 39 40 do { 41 if (--i < 0) 42 return; 43 44 asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status)); 45 } while (status & (1 << 29)); 46 47 asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch)); 48 } 49 50 51 #elif defined(CONFIG_CPU_XSCALE) 52 53 static void icedcc_putc(int ch) 54 { 55 int status, i = 0x4000000; 56 57 do { 58 if (--i < 0) 59 return; 60 61 asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status)); 62 } while (status & (1 << 28)); 63 64 asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch)); 65 } 66 67 #else 68 69 static void icedcc_putc(int ch) 70 { 71 int status, i = 0x4000000; 72 73 do { 74 if (--i < 0) 75 return; 76 77 asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status)); 78 } while (status & 2); 79 80 asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch)); 81 } 82 83 #endif 84 85 #define putc(ch) icedcc_putc(ch) 86 #endif 87 88 static void putstr(const char *ptr) 89 { 90 char c; 91 92 while ((c = *ptr++) != '\0') { 93 if (c == '\n') 94 putc('\r'); 95 putc(c); 96 } 97 98 flush(); 99 } 100 101 /* 102 * gzip declarations 103 */ 104 extern char input_data[]; 105 extern char input_data_end[]; 106 107 unsigned char *output_data; 108 109 unsigned long free_mem_ptr; 110 unsigned long free_mem_end_ptr; 111 112 #ifndef arch_error 113 #define arch_error(x) 114 #endif 115 116 void error(char *x) 117 { 118 arch_error(x); 119 120 putstr("\n\n"); 121 putstr(x); 122 putstr("\n\n -- System halted"); 123 124 while(1); /* Halt */ 125 } 126 127 asmlinkage void __div0(void) 128 { 129 error("Attempting division by 0!"); 130 } 131 132 extern int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x)); 133 134 135 void 136 decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p, 137 unsigned long free_mem_ptr_end_p, 138 int arch_id) 139 { 140 int ret; 141 142 output_data = (unsigned char *)output_start; 143 free_mem_ptr = free_mem_ptr_p; 144 free_mem_end_ptr = free_mem_ptr_end_p; 145 __machine_arch_type = arch_id; 146 147 #ifdef CONFIG_ARCH_EP93XX 148 ep93xx_decomp_setup(); 149 #endif 150 arch_decomp_setup(); 151 152 putstr("Uncompressing Linux..."); 153 ret = do_decompress(input_data, input_data_end - input_data, 154 output_data, error); 155 if (ret) 156 error("decompressor returned an error"); 157 else 158 putstr(" done, booting the kernel.\n"); 159 } 160 161 void fortify_panic(const char *name) 162 { 163 error("detected buffer overflow"); 164 } 165