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authorAlexander Egorenkov <egorenar@linux.ibm.com>2020-11-05 13:09:06 +0100
committerHeiko Carstens <hca@linux.ibm.com>2021-07-27 09:39:15 +0200
commitf1d3c5323772a215d910aeaf697d210a3671cf81 (patch)
tree18dd370f427bf284c19835fbed139d8ca23083cd
parent8b6bd6f295b7ff5e3205ef135de8ad3b2034ed73 (diff)
s390/boot: move sclp early buffer from fixed address in asm to C
To make the decompressor relocatable, the early SCLP buffer with a fixed address must be replaced with a relocatable C buffer of the according size and alignment as required by SCLP. Introduce a new function sclp_early_set_buffer() into the SCLP driver which enables the decompressor to change the SCLP early buffer at any time. This will be useful when the decompressor becomes fully relocatable and might need to change the SCLP early buffer to one with an address < 2G as required by SCLP because it was loaded at an address >= 2G. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
-rw-r--r--arch/s390/boot/boot.h1
-rw-r--r--arch/s390/boot/compressed/vmlinux.lds.S5
-rw-r--r--arch/s390/boot/head.S4
-rw-r--r--arch/s390/boot/sclp_early_core.c9
-rw-r--r--arch/s390/include/asm/sclp.h1
-rw-r--r--arch/s390/include/asm/setup.h4
-rw-r--r--drivers/s390/char/sclp_early_core.c7
7 files changed, 23 insertions, 8 deletions
diff --git a/arch/s390/boot/boot.h b/arch/s390/boot/boot.h
index 3d7d5ef4d169..716c35c1d78f 100644
--- a/arch/s390/boot/boot.h
+++ b/arch/s390/boot/boot.h
@@ -13,6 +13,7 @@ void setup_boot_command_line(void);
void parse_boot_command_line(void);
void verify_facilities(void);
void print_missing_facilities(void);
+void sclp_early_setup_buffer(void);
void print_pgm_check_info(void);
unsigned long get_random_base(unsigned long safe_addr);
void __printf(1, 2) decompressor_printk(const char *fmt, ...);
diff --git a/arch/s390/boot/compressed/vmlinux.lds.S b/arch/s390/boot/compressed/vmlinux.lds.S
index 0bd8aaaa4b33..d6a69aa6e937 100644
--- a/arch/s390/boot/compressed/vmlinux.lds.S
+++ b/arch/s390/boot/compressed/vmlinux.lds.S
@@ -3,6 +3,7 @@
#include <asm/vmlinux.lds.h>
#include <asm/thread_info.h>
#include <asm/page.h>
+#include <asm/sclp.h>
OUTPUT_FORMAT("elf64-s390", "elf64-s390", "elf64-s390")
OUTPUT_ARCH(s390:64-bit)
@@ -54,7 +55,9 @@ SECTIONS
KEEP(*(.dma.ex_table))
_stop_dma_ex_table = .;
}
- .dma.data : { *(.dma.data) }
+ .dma.data : {
+ *(.dma.data)
+ }
. = ALIGN(PAGE_SIZE);
_edma = .;
diff --git a/arch/s390/boot/head.S b/arch/s390/boot/head.S
index 4ac3958b3032..759f77c6af45 100644
--- a/arch/s390/boot/head.S
+++ b/arch/s390/boot/head.S
@@ -320,6 +320,7 @@ SYM_CODE_START_LOCAL(startup_normal)
spt 6f-.LPG0(%r13)
mvc __LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13)
larl %r15,_stack_end-STACK_FRAME_OVERHEAD
+ brasl %r14,sclp_early_setup_buffer
brasl %r14,verify_facilities
brasl %r14,startup_kernel
SYM_CODE_END(startup_normal)
@@ -410,7 +411,4 @@ SYM_DATA_START(parmarea)
.org PARMAREA+__PARMAREA_SIZE
SYM_DATA_END(parmarea)
- .org EARLY_SCCB_OFFSET
- .fill EXT_SCCB_READ_SCP
-
.org HEAD_END
diff --git a/arch/s390/boot/sclp_early_core.c b/arch/s390/boot/sclp_early_core.c
index 5a19fd7020b5..6f30646afbd0 100644
--- a/arch/s390/boot/sclp_early_core.c
+++ b/arch/s390/boot/sclp_early_core.c
@@ -1,2 +1,11 @@
// SPDX-License-Identifier: GPL-2.0
+#include "boot.h"
#include "../../../drivers/s390/char/sclp_early_core.c"
+
+/* SCLP early buffer must stay page-aligned and below 2GB */
+static char __sclp_early_sccb[EXT_SCCB_READ_SCP] __aligned(PAGE_SIZE);
+
+void sclp_early_setup_buffer(void)
+{
+ sclp_early_set_buffer(&__sclp_early_sccb);
+}
diff --git a/arch/s390/include/asm/sclp.h b/arch/s390/include/asm/sclp.h
index 3adbb417f740..835adb85b016 100644
--- a/arch/s390/include/asm/sclp.h
+++ b/arch/s390/include/asm/sclp.h
@@ -115,6 +115,7 @@ struct zpci_report_error_header {
u8 data[0]; /* Subsequent Data passed verbatim to SCLP ET 24 */
} __packed;
+void sclp_early_set_buffer(void *sccb);
int sclp_early_read_info(void);
int sclp_early_read_storage_info(void);
int sclp_early_get_core_info(struct sclp_core_info *info);
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index cf285f57579f..b72714c632d7 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -7,15 +7,13 @@
#define _ASM_S390_SETUP_H
#include <linux/bits.h>
-#include <asm/sclp.h>
#include <uapi/asm/setup.h>
#include <linux/build_bug.h>
#define EP_OFFSET 0x10008
#define EP_STRING "S390EP"
#define PARMAREA 0x10400
-#define EARLY_SCCB_OFFSET 0x11000
-#define HEAD_END (EARLY_SCCB_OFFSET + EXT_SCCB_READ_SCP)
+#define HEAD_END 0x11000
/*
* Machine features detected in early.c
diff --git a/drivers/s390/char/sclp_early_core.c b/drivers/s390/char/sclp_early_core.c
index 80ba6523e76e..676634de65a8 100644
--- a/drivers/s390/char/sclp_early_core.c
+++ b/drivers/s390/char/sclp_early_core.c
@@ -17,7 +17,7 @@
static struct read_info_sccb __bootdata(sclp_info_sccb);
static int __bootdata(sclp_info_sccb_valid);
-char *sclp_early_sccb = (char *) EARLY_SCCB_OFFSET;
+char *__bootdata(sclp_early_sccb);
int sclp_init_state = sclp_init_state_uninitialized;
/*
* Used to keep track of the size of the event masks. Qemu until version 2.11
@@ -211,6 +211,11 @@ static int sclp_early_setup(int disable, int *have_linemode, int *have_vt220)
return rc;
}
+void sclp_early_set_buffer(void *sccb)
+{
+ sclp_early_sccb = sccb;
+}
+
/*
* Output one or more lines of text on the SCLP console (VT220 and /
* or line-mode).