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 #ifdef CONFIG_ARCH_EP93XX 27 #include "misc-ep93xx.h" 28 #endif 29 30 static void putstr(const char *ptr); 31 32 #include CONFIG_UNCOMPRESS_INCLUDE 33 34 #ifdef CONFIG_DEBUG_ICEDCC 35 36 #if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7) 37 38 static void icedcc_putc(int ch) 39 { 40 int status, i = 0x4000000; 41 42 do { 43 if (--i < 0) 44 return; 45 46 asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status)); 47 } while (status & (1 << 29)); 48 49 asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch)); 50 } 51 52 53 #elif defined(CONFIG_CPU_XSCALE) 54 55 static void icedcc_putc(int ch) 56 { 57 int status, i = 0x4000000; 58 59 do { 60 if (--i < 0) 61 return; 62 63 asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status)); 64 } while (status & (1 << 28)); 65 66 asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch)); 67 } 68 69 #else 70 71 static void icedcc_putc(int ch) 72 { 73 int status, i = 0x4000000; 74 75 do { 76 if (--i < 0) 77 return; 78 79 asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status)); 80 } while (status & 2); 81 82 asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch)); 83 } 84 85 #endif 86 87 #define putc(ch) icedcc_putc(ch) 88 #endif 89 90 static void putstr(const char *ptr) 91 { 92 char c; 93 94 while ((c = *ptr++) != '\0') { 95 if (c == '\n') 96 putc('\r'); 97 putc(c); 98 } 99 100 flush(); 101 } 102 103 /* 104 * gzip declarations 105 */ 106 unsigned char *output_data; 107 108 unsigned long free_mem_ptr; 109 unsigned long free_mem_end_ptr; 110 111 #ifndef arch_error 112 #define arch_error(x) 113 #endif 114 115 void error(char *x) 116 { 117 arch_error(x); 118 119 putstr("\n\n"); 120 putstr(x); 121 putstr("\n\n -- System halted"); 122 123 while(1); /* Halt */ 124 } 125 126 asmlinkage void __div0(void) 127 { 128 error("Attempting division by 0!"); 129 } 130 131 void 132 decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p, 133 unsigned long free_mem_ptr_end_p, 134 int arch_id) 135 { 136 int ret; 137 138 output_data = (unsigned char *)output_start; 139 free_mem_ptr = free_mem_ptr_p; 140 free_mem_end_ptr = free_mem_ptr_end_p; 141 __machine_arch_type = arch_id; 142 143 #ifdef CONFIG_ARCH_EP93XX 144 ep93xx_decomp_setup(); 145 #endif 146 arch_decomp_setup(); 147 148 putstr("Uncompressing Linux..."); 149 ret = do_decompress(input_data, input_data_end - input_data, 150 output_data, error); 151 if (ret) 152 error("decompressor returned an error"); 153 else 154 putstr(" done, booting the kernel.\n"); 155 } 156 157 void fortify_panic(const char *name) 158 { 159 error("detected buffer overflow"); 160 } 161