mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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06c0dd72ae
Fix two bugs with the kernel image compression: 1) reset the bss section of the compressed vmlinux 2) clear the high half of the registers for 64 bit early enough for the decompression step Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
159 lines
3.5 KiB
C
159 lines
3.5 KiB
C
/*
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* Definitions and wrapper functions for kernel decompressor
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*
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* Copyright IBM Corp. 2010
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*
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#include <asm/uaccess.h>
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#include <asm/page.h>
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#include <asm/ipl.h>
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#include "sizes.h"
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/*
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* gzip declarations
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*/
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#define STATIC static
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#undef memset
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#undef memcpy
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#undef memmove
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#define memzero(s, n) memset((s), 0, (n))
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/* Symbols defined by linker scripts */
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extern char input_data[];
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extern int input_len;
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extern char _text, _end;
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extern char _bss, _ebss;
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static void error(char *m);
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static unsigned long free_mem_ptr;
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static unsigned long free_mem_end_ptr;
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#ifdef CONFIG_HAVE_KERNEL_BZIP2
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#define HEAP_SIZE 0x400000
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#else
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#define HEAP_SIZE 0x10000
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#endif
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#ifdef CONFIG_KERNEL_GZIP
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#include "../../../../lib/decompress_inflate.c"
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#endif
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#ifdef CONFIG_KERNEL_BZIP2
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#include "../../../../lib/decompress_bunzip2.c"
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#endif
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#ifdef CONFIG_KERNEL_LZMA
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#include "../../../../lib/decompress_unlzma.c"
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#endif
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extern _sclp_print_early(const char *);
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int puts(const char *s)
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{
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_sclp_print_early(s);
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return 0;
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}
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void *memset(void *s, int c, size_t n)
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{
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char *xs;
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if (c == 0)
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return __builtin_memset(s, 0, n);
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xs = (char *) s;
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if (n > 0)
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do {
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*xs++ = c;
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} while (--n > 0);
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return s;
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}
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void *memcpy(void *__dest, __const void *__src, size_t __n)
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{
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return __builtin_memcpy(__dest, __src, __n);
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}
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void *memmove(void *__dest, __const void *__src, size_t __n)
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{
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char *d;
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const char *s;
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if (__dest <= __src)
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return __builtin_memcpy(__dest, __src, __n);
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d = __dest + __n;
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s = __src + __n;
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while (__n--)
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*--d = *--s;
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return __dest;
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}
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static void error(char *x)
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{
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unsigned long long psw = 0x000a0000deadbeefULL;
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puts("\n\n");
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puts(x);
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puts("\n\n -- System halted");
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asm volatile("lpsw %0" : : "Q" (psw));
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}
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/*
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* Safe guard the ipl parameter block against a memory area that will be
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* overwritten. The validity check for the ipl parameter block is complex
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* (see cio_get_iplinfo and ipl_save_parameters) but if the pointer to
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* the ipl parameter block intersects with the passed memory area we can
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* safely assume that we can read from that memory. In that case just copy
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* the memory to IPL_PARMBLOCK_ORIGIN even if there is no ipl parameter
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* block.
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*/
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static void check_ipl_parmblock(void *start, unsigned long size)
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{
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void *src, *dst;
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src = (void *)(unsigned long) S390_lowcore.ipl_parmblock_ptr;
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if (src + PAGE_SIZE <= start || src >= start + size)
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return;
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dst = (void *) IPL_PARMBLOCK_ORIGIN;
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memmove(dst, src, PAGE_SIZE);
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S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
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}
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unsigned long decompress_kernel(void)
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{
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unsigned long output_addr;
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unsigned char *output;
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check_ipl_parmblock((void *) 0, (unsigned long) output + SZ__bss_start);
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memset(&_bss, 0, &_ebss - &_bss);
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free_mem_ptr = (unsigned long)&_end;
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free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
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output = (unsigned char *) ((free_mem_end_ptr + 4095UL) & -4096UL);
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#ifdef CONFIG_BLK_DEV_INITRD
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/*
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* Move the initrd right behind the end of the decompressed
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* kernel image.
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*/
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if (INITRD_START && INITRD_SIZE &&
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INITRD_START < (unsigned long) output + SZ__bss_start) {
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check_ipl_parmblock(output + SZ__bss_start,
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INITRD_START + INITRD_SIZE);
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memmove(output + SZ__bss_start,
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(void *) INITRD_START, INITRD_SIZE);
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INITRD_START = (unsigned long) output + SZ__bss_start;
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}
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#endif
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puts("Uncompressing Linux... ");
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decompress(input_data, input_len, NULL, NULL, output, NULL, error);
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puts("Ok, booting the kernel.\n");
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return (unsigned long) output;
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}
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