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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/s390/boot/compressed/head.S
Initial import
Diffstat (limited to 'arch/s390/boot/compressed/head.S')
-rw-r--r--arch/s390/boot/compressed/head.S48
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/s390/boot/compressed/head.S b/arch/s390/boot/compressed/head.S
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index 000000000..f86a4eef2
--- /dev/null
+++ b/arch/s390/boot/compressed/head.S
@@ -0,0 +1,48 @@
+/*
+ * Startup glue code to uncompress the kernel
+ *
+ * Copyright IBM Corp. 2010
+ *
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+#include <asm/page.h>
+#include "sizes.h"
+
+__HEAD
+ENTRY(startup_continue)
+ basr %r13,0 # get base
+.LPG1:
+ # setup stack
+ lg %r15,.Lstack-.LPG1(%r13)
+ aghi %r15,-160
+ brasl %r14,decompress_kernel
+ # setup registers for memory mover & branch to target
+ lgr %r4,%r2
+ lg %r2,.Loffset-.LPG1(%r13)
+ la %r4,0(%r2,%r4)
+ lg %r3,.Lmvsize-.LPG1(%r13)
+ lgr %r5,%r3
+ # move the memory mover someplace safe
+ la %r1,0x200
+ mvc 0(mover_end-mover,%r1),mover-.LPG1(%r13)
+ # decompress image is started at 0x11000
+ lgr %r6,%r2
+ br %r1
+mover:
+ mvcle %r2,%r4,0
+ jo mover
+ br %r6
+mover_end:
+
+ .align 8
+.Lstack:
+ .quad 0x8000 + (1<<(PAGE_SHIFT+THREAD_ORDER))
+.Loffset:
+ .quad 0x11000
+.Lmvsize:
+ .quad SZ__bss_start