diff options
Diffstat (limited to 'purgatory/arch')
| -rw-r--r-- | purgatory/arch/x86_64/purgatory-x86_64.c | 11 | ||||
| -rw-r--r-- | purgatory/arch/x86_64/setup-x86_64.S | 3 |
2 files changed, 13 insertions, 1 deletions
diff --git a/purgatory/arch/x86_64/purgatory-x86_64.c b/purgatory/arch/x86_64/purgatory-x86_64.c index 1513508..c25a9c2 100644 --- a/purgatory/arch/x86_64/purgatory-x86_64.c +++ b/purgatory/arch/x86_64/purgatory-x86_64.c @@ -6,6 +6,7 @@ uint8_t reset_vga = 0; uint8_t legacy_pic = 0; uint8_t panic_kernel = 0; +unsigned long jump_back_entry = 0; char *cmdline_end = NULL; void setup_arch(void) @@ -14,8 +15,16 @@ void setup_arch(void) if (legacy_pic) x86_setup_legacy_pic(); } +void x86_setup_jump_back_entry(void) +{ + if (cmdline_end) + sprintf(cmdline_end, " kexec_jump_back_entry=0x%lx", + jump_back_entry); +} + /* This function can be used to execute after the SHA256 verification. */ void post_verification_setup_arch(void) { - if (panic_kernel) crashdump_backup_memory(); + if (panic_kernel) crashdump_backup_memory(); + if (jump_back_entry) x86_setup_jump_back_entry(); } diff --git a/purgatory/arch/x86_64/setup-x86_64.S b/purgatory/arch/x86_64/setup-x86_64.S index d3b5993..74997fa 100644 --- a/purgatory/arch/x86_64/setup-x86_64.S +++ b/purgatory/arch/x86_64/setup-x86_64.S @@ -41,6 +41,9 @@ purgatory_start: /* In 64bit mode the code segment is meaningless */ + movq 0(%rsp), %rax + movq %rax, jump_back_entry + /* Setup a stack */ movq $lstack_end, %rsp |