1 // SPDX-License-Identifier: GPL-2.0
5 * This is a collection of several routines from gzip-1.0.3
8 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
10 * Modified for ARM Linux by Russell King
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.
20 unsigned int __machine_arch_type;
22 #include <linux/compiler.h> /* for inline */
23 #include <linux/types.h>
24 #include <linux/linkage.h>
26 static void putstr(const char *ptr);
27 extern void error(char *x);
29 #include CONFIG_UNCOMPRESS_INCLUDE
31 #ifdef CONFIG_DEBUG_ICEDCC
33 #if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7)
35 static void icedcc_putc(int ch)
37 int status, i = 0x4000000;
43 asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status));
44 } while (status & (1 << 29));
46 asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch));
50 #elif defined(CONFIG_CPU_XSCALE)
52 static void icedcc_putc(int ch)
54 int status, i = 0x4000000;
60 asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status));
61 } while (status & (1 << 28));
63 asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch));
68 static void icedcc_putc(int ch)
70 int status, i = 0x4000000;
76 asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status));
79 asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch));
84 #define putc(ch) icedcc_putc(ch)
87 static void putstr(const char *ptr)
91 while ((c = *ptr++) != '\0') {
103 extern char input_data[];
104 extern char input_data_end[];
106 unsigned char *output_data;
108 unsigned long free_mem_ptr;
109 unsigned long free_mem_end_ptr;
112 #define arch_error(x)
121 putstr("\n\n -- System halted");
126 asmlinkage void __div0(void)
128 error("Attempting division by 0!");
131 unsigned long __stack_chk_guard;
133 void __stack_chk_guard_setup(void)
135 __stack_chk_guard = 0x000a0dff;
138 void __stack_chk_fail(void)
140 error("stack-protector: Kernel stack is corrupted\n");
143 extern int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x));
147 decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
148 unsigned long free_mem_ptr_end_p,
153 __stack_chk_guard_setup();
155 output_data = (unsigned char *)output_start;
156 free_mem_ptr = free_mem_ptr_p;
157 free_mem_end_ptr = free_mem_ptr_end_p;
158 __machine_arch_type = arch_id;
162 putstr("Uncompressing Linux...");
163 ret = do_decompress(input_data, input_data_end - input_data,
166 error("decompressor returned an error");
168 putstr(" done, booting the kernel.\n");