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Diffstat (limited to 'arch/parisc/kernel/alternative.c')
-rw-r--r--arch/parisc/kernel/alternative.c23
1 files changed, 17 insertions, 6 deletions
diff --git a/arch/parisc/kernel/alternative.c b/arch/parisc/kernel/alternative.c
index ca1f5ca0540a..3c66d5c4d90d 100644
--- a/arch/parisc/kernel/alternative.c
+++ b/arch/parisc/kernel/alternative.c
@@ -28,7 +28,8 @@ void __init_or_module apply_alternatives(struct alt_instr *start,
for (entry = start; entry < end; entry++, index++) {
- u32 *from, len, cond, replacement;
+ u32 *from, cond, replacement;
+ s32 len;
from = (u32 *)((ulong)&entry->orig_offset + entry->orig_offset);
len = entry->len;
@@ -49,6 +50,8 @@ void __init_or_module apply_alternatives(struct alt_instr *start,
continue;
if ((cond & ALT_COND_NO_ICACHE) && (cache_info.ic_size != 0))
continue;
+ if ((cond & ALT_COND_RUN_ON_QEMU) && !running_on_qemu)
+ continue;
/*
* If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit
@@ -74,11 +77,19 @@ void __init_or_module apply_alternatives(struct alt_instr *start,
if (replacement == INSN_NOP && len > 1)
replacement = 0xe8000002 + (len-2)*8; /* "b,n .+8" */
- pr_debug("Do %d: Cond 0x%x, Replace %02d instructions @ 0x%px with 0x%08x\n",
- index, cond, len, from, replacement);
-
- /* Replace instruction */
- *from = replacement;
+ pr_debug("ALTERNATIVE %3d: Cond %2x, Replace %2d instructions to 0x%08x @ 0x%px (%pS)\n",
+ index, cond, len, replacement, from, from);
+
+ if (len < 0) {
+ /* Replace multiple instruction by new code */
+ u32 *source;
+ len = -len;
+ source = (u32 *)((ulong)&entry->replacement + entry->replacement);
+ memcpy(from, source, 4 * len);
+ } else {
+ /* Replace by one instruction */
+ *from = replacement;
+ }
applied++;
}