diff options
Diffstat (limited to 'arch/x86/boot')
| -rw-r--r-- | arch/x86/boot/compressed/head_64.S | 10 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/pgtable_64.c | 13 |
2 files changed, 23 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index d598d65db32c..8ba0582c65d5 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -355,6 +355,16 @@ ENTRY(startup_64) lretq lvl5: + /* + * cleanup_trampoline() would restore trampoline memory. + * + * RSI holds real mode data and needs to be preserved across + * this function call. + */ + pushq %rsi + call cleanup_trampoline + popq %rsi + /* Zero EFLAGS */ pushq $0 popfq diff --git a/arch/x86/boot/compressed/pgtable_64.c b/arch/x86/boot/compressed/pgtable_64.c index 21d5cc1cd5fa..01d08d3e3e43 100644 --- a/arch/x86/boot/compressed/pgtable_64.c +++ b/arch/x86/boot/compressed/pgtable_64.c @@ -1,5 +1,6 @@ #include <asm/processor.h> #include "pgtable.h" +#include "../string.h" /* * __force_order is used by special_insns.h asm code to force instruction @@ -18,6 +19,9 @@ struct paging_config { unsigned long l5_required; }; +/* Buffer to preserve trampoline memory */ +static char trampoline_save[TRAMPOLINE_32BIT_SIZE]; + /* * Trampoline address will be printed by extract_kernel() for debugging * purposes. @@ -69,5 +73,14 @@ struct paging_config paging_prepare(void) trampoline_32bit = (unsigned long *)paging_config.trampoline_start; + /* Preserve trampoline memory */ + memcpy(trampoline_save, trampoline_32bit, TRAMPOLINE_32BIT_SIZE); + return paging_config; } + +void cleanup_trampoline(void) +{ + /* Restore trampoline memory */ + memcpy(trampoline_32bit, trampoline_save, TRAMPOLINE_32BIT_SIZE); +} |