Release 4.14 arch/x86/purgatory/purgatory.c
/*
* purgatory: Runs between two kernels
*
* Copyright (C) 2014 Red Hat Inc.
*
* Author:
* Vivek Goyal <vgoyal@redhat.com>
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
#include <linux/bug.h>
#include <asm/purgatory.h>
#include "sha256.h"
#include "../boot/string.h"
unsigned long purgatory_backup_dest __section(.kexec-purgatory);
unsigned long purgatory_backup_src __section(.kexec-purgatory);
unsigned long purgatory_backup_sz __section(.kexec-purgatory);
u8 purgatory_sha256_digest[SHA256_DIGEST_SIZE] __section(.kexec-purgatory);
struct kexec_sha_region purgatory_sha_regions[KEXEC_SEGMENT_MAX] __section(.kexec-purgatory);
/*
* On x86, second kernel requries first 640K of memory to boot. Copy
* first 640K to a backup region in reserved memory range so that second
* kernel can use first 640K.
*/
static int copy_backup_region(void)
{
if (purgatory_backup_dest) {
memcpy((void *)purgatory_backup_dest,
(void *)purgatory_backup_src, purgatory_backup_sz);
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Vivek Goyal | 28 | 82.35% | 1 | 50.00% |
| Thomas Gleixner | 6 | 17.65% | 1 | 50.00% |
| Total | 34 | 100.00% | 2 | 100.00% |
static int verify_sha256_digest(void)
{
struct kexec_sha_region *ptr, *end;
u8 digest[SHA256_DIGEST_SIZE];
struct sha256_state sctx;
sha256_init(&sctx);
end = purgatory_sha_regions + ARRAY_SIZE(purgatory_sha_regions);
for (ptr = purgatory_sha_regions; ptr < end; ptr++)
sha256_update(&sctx, (uint8_t *)(ptr->start), ptr->len);
sha256_final(&sctx, digest);
if (memcmp(digest, purgatory_sha256_digest, sizeof(digest)))
return 1;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Vivek Goyal | 94 | 92.16% | 1 | 33.33% |
| Thomas Gleixner | 7 | 6.86% | 1 | 33.33% |
| Tobin C Harding | 1 | 0.98% | 1 | 33.33% |
| Total | 102 | 100.00% | 3 | 100.00% |
void purgatory(void)
{
int ret;
ret = verify_sha256_digest();
if (ret) {
/* loop forever */
for (;;)
;
}
copy_backup_region();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Vivek Goyal | 31 | 100.00% | 1 | 100.00% |
| Total | 31 | 100.00% | 1 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Vivek Goyal | 177 | 73.44% | 1 | 25.00% |
| Thomas Gleixner | 61 | 25.31% | 1 | 25.00% |
| Tobin C Harding | 3 | 1.24% | 2 | 50.00% |
| Total | 241 | 100.00% | 4 | 100.00% |
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