[S390] zfcpdump support.
s390 machines provide hardware support for creating Linux dumps on SCSI
disks. For creating a dump a special purpose dump Linux is used. The first
32 MB of memory are saved by the hardware before the dump Linux is
booted. Via an SCLP interface, the saved memory can be accessed from
Linux. This patch exports memory and registers of the crashed Linux to
userspace via a debugfs file. For more information refer to
Documentation/s390/zfcpdump.txt, which is included in this patch.
Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
diff --git a/include/asm-s390/lowcore.h b/include/asm-s390/lowcore.h
index 4a31d0a..ffc9788 100644
--- a/include/asm-s390/lowcore.h
+++ b/include/asm-s390/lowcore.h
@@ -147,6 +147,52 @@
void mcck_int_handler(void);
void io_int_handler(void);
+struct save_area_s390 {
+ u32 ext_save;
+ u64 timer;
+ u64 clk_cmp;
+ u8 pad1[24];
+ u8 psw[8];
+ u32 pref_reg;
+ u8 pad2[20];
+ u32 acc_regs[16];
+ u64 fp_regs[4];
+ u32 gp_regs[16];
+ u32 ctrl_regs[16];
+} __attribute__((packed));
+
+struct save_area_s390x {
+ u64 fp_regs[16];
+ u64 gp_regs[16];
+ u8 psw[16];
+ u8 pad1[8];
+ u32 pref_reg;
+ u32 fp_ctrl_reg;
+ u8 pad2[4];
+ u32 tod_reg;
+ u64 timer;
+ u64 clk_cmp;
+ u8 pad3[8];
+ u32 acc_regs[16];
+ u64 ctrl_regs[16];
+} __attribute__((packed));
+
+union save_area {
+ struct save_area_s390 s390;
+ struct save_area_s390x s390x;
+};
+
+#define SAVE_AREA_BASE_S390 0xd4
+#define SAVE_AREA_BASE_S390X 0x1200
+
+#ifndef __s390x__
+#define SAVE_AREA_SIZE sizeof(struct save_area_s390)
+#define SAVE_AREA_BASE SAVE_AREA_BASE_S390
+#else
+#define SAVE_AREA_SIZE sizeof(struct save_area_s390x)
+#define SAVE_AREA_BASE SAVE_AREA_BASE_S390X
+#endif
+
struct _lowcore
{
#ifndef __s390x__