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-rw-r--r--arch/s390/boot/Makefile2
-rw-r--r--arch/s390/boot/compressed/vmlinux.lds.S21
-rw-r--r--arch/s390/boot/head.S32
-rw-r--r--arch/s390/boot/startup.c39
-rw-r--r--arch/s390/boot/text_dma.S167
-rw-r--r--arch/s390/hypfs/hypfs_diag0c.c18
-rw-r--r--arch/s390/include/asm/diag.h13
-rw-r--r--arch/s390/include/asm/extable.h5
-rw-r--r--arch/s390/include/asm/ipl.h1
-rw-r--r--arch/s390/include/asm/linkage.h7
-rw-r--r--arch/s390/include/asm/sections.h3
-rw-r--r--arch/s390/kernel/base.S68
-rw-r--r--arch/s390/kernel/diag.c67
-rw-r--r--arch/s390/kernel/early.c2
-rw-r--r--arch/s390/kernel/head64.S26
-rw-r--r--arch/s390/kernel/ipl.c2
-rw-r--r--arch/s390/kernel/kprobes.c2
-rw-r--r--arch/s390/kernel/machine_kexec.c2
-rw-r--r--arch/s390/kernel/setup.c9
-rw-r--r--arch/s390/kernel/smp.c2
-rw-r--r--arch/s390/kernel/swsusp.S15
-rw-r--r--arch/s390/kernel/traps.c3
-rw-r--r--arch/s390/mm/fault.c14
-rw-r--r--arch/s390/mm/vmem.c2
24 files changed, 334 insertions, 188 deletions
diff --git a/arch/s390/boot/Makefile b/arch/s390/boot/Makefile
index 4df43e83363a..88932c25ad26 100644
--- a/arch/s390/boot/Makefile
+++ b/arch/s390/boot/Makefile
@@ -30,7 +30,7 @@ CFLAGS_sclp_early_core.o += -I$(srctree)/drivers/s390/char
obj-y := head.o als.o startup.o mem_detect.o ipl_parm.o ipl_report.o
obj-y += string.o ebcdic.o sclp_early_core.o mem.o ipl_vmparm.o cmdline.o
-obj-y += ctype.o
+obj-y += ctype.o text_dma.o
obj-$(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) += uv.o
obj-$(CONFIG_RELOCATABLE) += machine_kexec_reloc.o
targets := bzImage startup.a section_cmp.boot.data section_cmp.boot.preserved.data $(obj-y)
diff --git a/arch/s390/boot/compressed/vmlinux.lds.S b/arch/s390/boot/compressed/vmlinux.lds.S
index 1c8ef393c656..112b8d9f1e4c 100644
--- a/arch/s390/boot/compressed/vmlinux.lds.S
+++ b/arch/s390/boot/compressed/vmlinux.lds.S
@@ -33,6 +33,27 @@ SECTIONS
*(.data.*)
_edata = . ;
}
+ /*
+ * .dma section for code, data, ex_table that need to stay below 2 GB,
+ * even when the kernel is relocate: above 2 GB.
+ */
+ _sdma = .;
+ .dma.text : {
+ . = ALIGN(PAGE_SIZE);
+ _stext_dma = .;
+ *(.dma.text)
+ . = ALIGN(PAGE_SIZE);
+ _etext_dma = .;
+ }
+ . = ALIGN(16);
+ .dma.ex_table : {
+ _start_dma_ex_table = .;
+ KEEP(*(.dma.ex_table))
+ _stop_dma_ex_table = .;
+ }
+ .dma.data : { *(.dma.data) }
+ _edma = .;
+
BOOT_DATA
BOOT_DATA_PRESERVED
diff --git a/arch/s390/boot/head.S b/arch/s390/boot/head.S
index c6b4b4c5dd58..028aab03a9e7 100644
--- a/arch/s390/boot/head.S
+++ b/arch/s390/boot/head.S
@@ -305,7 +305,7 @@ ENTRY(startup_kdump)
xc 0x300(256),0x300
xc 0xe00(256),0xe00
xc 0xf00(256),0xf00
- lctlg %c0,%c15,0x200(%r0) # initialize control registers
+ lctlg %c0,%c15,.Lctl-.LPG0(%r13) # load control registers
stcke __LC_BOOT_CLOCK
mvc __LC_LAST_UPDATE_CLOCK(8),__LC_BOOT_CLOCK+1
spt 6f-.LPG0(%r13)
@@ -319,6 +319,36 @@ ENTRY(startup_kdump)
.align 8
6: .long 0x7fffffff,0xffffffff
+.Lctl: .quad 0x04040000 # cr0: AFP registers & secondary space
+ .quad 0 # cr1: primary space segment table
+ .quad .Lduct # cr2: dispatchable unit control table
+ .quad 0 # cr3: instruction authorization
+ .quad 0xffff # cr4: instruction authorization
+ .quad .Lduct # cr5: primary-aste origin
+ .quad 0 # cr6: I/O interrupts
+ .quad 0 # cr7: secondary space segment table
+ .quad 0 # cr8: access registers translation
+ .quad 0 # cr9: tracing off
+ .quad 0 # cr10: tracing off
+ .quad 0 # cr11: tracing off
+ .quad 0 # cr12: tracing off
+ .quad 0 # cr13: home space segment table
+ .quad 0xc0000000 # cr14: machine check handling off
+ .quad .Llinkage_stack # cr15: linkage stack operations
+
+ .section .dma.data,"aw",@progbits
+.Lduct: .long 0,.Laste,.Laste,0,.Lduald,0,0,0
+ .long 0,0,0,0,0,0,0,0
+.Llinkage_stack:
+ .long 0,0,0x89000000,0,0,0,0x8a000000,0
+ .align 64
+.Laste: .quad 0,0xffffffffffffffff,0,0,0,0,0,0
+ .align 128
+.Lduald:.rept 8
+ .long 0x80000000,0,0,0 # invalid access-list entries
+ .endr
+ .previous
+
#include "head_kdump.S"
#
diff --git a/arch/s390/boot/startup.c b/arch/s390/boot/startup.c
index b7d6a76cb5e9..e3f339d248ce 100644
--- a/arch/s390/boot/startup.c
+++ b/arch/s390/boot/startup.c
@@ -1,9 +1,11 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/string.h>
#include <linux/elf.h>
+#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/kexec.h>
#include <asm/sclp.h>
+#include <asm/diag.h>
#include <asm/uv.h>
#include "compressed/decompressor.h"
#include "boot.h"
@@ -11,6 +13,43 @@
extern char __boot_data_start[], __boot_data_end[];
extern char __boot_data_preserved_start[], __boot_data_preserved_end[];
+/*
+ * Some code and data needs to stay below 2 GB, even when the kernel would be
+ * relocated above 2 GB, because it has to use 31 bit addresses.
+ * Such code and data is part of the .dma section, and its location is passed
+ * over to the decompressed / relocated kernel via the .boot.preserved.data
+ * section.
+ */
+extern char _sdma[], _edma[];
+extern char _stext_dma[], _etext_dma[];
+extern struct exception_table_entry _start_dma_ex_table[];
+extern struct exception_table_entry _stop_dma_ex_table[];
+unsigned long __bootdata_preserved(__sdma) = __pa(&_sdma);
+unsigned long __bootdata_preserved(__edma) = __pa(&_edma);
+unsigned long __bootdata_preserved(__stext_dma) = __pa(&_stext_dma);
+unsigned long __bootdata_preserved(__etext_dma) = __pa(&_etext_dma);
+struct exception_table_entry *
+ __bootdata_preserved(__start_dma_ex_table) = _start_dma_ex_table;
+struct exception_table_entry *
+ __bootdata_preserved(__stop_dma_ex_table) = _stop_dma_ex_table;
+
+int _diag210_dma(struct diag210 *addr);
+int _diag26c_dma(void *req, void *resp, enum diag26c_sc subcode);
+int _diag14_dma(unsigned long rx, unsigned long ry1, unsigned long subcode);
+void _diag0c_dma(struct hypfs_diag0c_entry *entry);
+void _diag308_reset_dma(void);
+struct diag_ops __bootdata_preserved(diag_dma_ops) = {
+ .diag210 = _diag210_dma,
+ .diag26c = _diag26c_dma,
+ .diag14 = _diag14_dma,
+ .diag0c = _diag0c_dma,
+ .diag308_reset = _diag308_reset_dma
+};
+static struct diag210 _diag210_tmp_dma __section(".dma.data");
+struct diag210 *__bootdata_preserved(__diag210_tmp_dma) = &_diag210_tmp_dma;
+void _swsusp_reset_dma(void);
+unsigned long __bootdata_preserved(__swsusp_reset_dma) = __pa(_swsusp_reset_dma);
+
void error(char *x)
{
sclp_early_printk("\n\n");
diff --git a/arch/s390/boot/text_dma.S b/arch/s390/boot/text_dma.S
new file mode 100644
index 000000000000..2414360ff22d
--- /dev/null
+++ b/arch/s390/boot/text_dma.S
@@ -0,0 +1,167 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Code that needs to run below 2 GB.
+ *
+ * Copyright IBM Corp. 2019
+ */
+
+#include <linux/linkage.h>
+#include <asm/errno.h>
+#include <asm/sigp.h>
+
+ .section .dma.text,"ax"
+/*
+ * Simplified version of expoline thunk. The normal thunks can not be used here,
+ * because they might be more than 2 GB away, and not reachable by the relative
+ * branch. No comdat, exrl, etc. optimizations used here, because it only
+ * affects a few functions that are not performance-relevant.
+ */
+ .macro BR_EX_DMA_r14
+ larl %r1,0f
+ ex 0,0(%r1)
+ j .
+0: br %r14
+ .endm
+
+/*
+ * int _diag14_dma(unsigned long rx, unsigned long ry1, unsigned long subcode)
+ */
+ENTRY(_diag14_dma)
+ lgr %r1,%r2
+ lgr %r2,%r3
+ lgr %r3,%r4
+ lhi %r5,-EIO
+ sam31
+ diag %r1,%r2,0x14
+.Ldiag14_ex:
+ ipm %r5
+ srl %r5,28
+.Ldiag14_fault:
+ sam64
+ lgfr %r2,%r5
+ BR_EX_DMA_r14
+ EX_TABLE_DMA(.Ldiag14_ex, .Ldiag14_fault)
+
+/*
+ * int _diag210_dma(struct diag210 *addr)
+ */
+ENTRY(_diag210_dma)
+ lgr %r1,%r2
+ lhi %r2,-1
+ sam31
+ diag %r1,%r0,0x210
+.Ldiag210_ex:
+ ipm %r2
+ srl %r2,28
+.Ldiag210_fault:
+ sam64
+ lgfr %r2,%r2
+ BR_EX_DMA_r14
+ EX_TABLE_DMA(.Ldiag210_ex, .Ldiag210_fault)
+
+/*
+ * int _diag26c_dma(void *req, void *resp, enum diag26c_sc subcode)
+ */
+ENTRY(_diag26c_dma)
+ lghi %r5,-EOPNOTSUPP
+ sam31
+ diag %r2,%r4,0x26c
+.Ldiag26c_ex:
+ sam64
+ lgfr %r2,%r5
+ BR_EX_DMA_r14
+ EX_TABLE_DMA(.Ldiag26c_ex, .Ldiag26c_ex)
+
+/*
+ * void _diag0c_dma(struct hypfs_diag0c_entry *entry)
+ */
+ENTRY(_diag0c_dma)
+ sam31
+ diag %r2,%r2,0x0c
+ sam64
+ BR_EX_DMA_r14
+
+/*
+ * void _swsusp_reset_dma(void)
+ */
+ENTRY(_swsusp_reset_dma)
+ larl %r1,restart_entry
+ larl %r2,.Lrestart_diag308_psw
+ og %r1,0(%r2)
+ stg %r1,0(%r0)
+ lghi %r0,0
+ diag %r0,%r0,0x308
+restart_entry:
+ lhi %r1,1
+ sigp %r1,%r0,SIGP_SET_ARCHITECTURE
+ sam64
+ BR_EX_DMA_r14
+
+/*
+ * void _diag308_reset_dma(void)
+ *
+ * Calls diag 308 subcode 1 and continues execution
+ */
+ENTRY(_diag308_reset_dma)
+ larl %r4,.Lctlregs # Save control registers
+ stctg %c0,%c15,0(%r4)
+ lg %r2,0(%r4) # Disable lowcore protection
+ nilh %r2,0xefff
+ larl %r4,.Lctlreg0
+ stg %r2,0(%r4)
+ lctlg %c0,%c0,0(%r4)
+ larl %r4,.Lfpctl # Floating point control register
+ stfpc 0(%r4)
+ larl %r4,.Lprefix # Save prefix register
+ stpx 0(%r4)
+ larl %r4,.Lprefix_zero # Set prefix register to 0
+ spx 0(%r4)
+ larl %r4,.Lcontinue_psw # Save PSW flags
+ epsw %r2,%r3
+ stm %r2,%r3,0(%r4)
+ larl %r4,restart_part2 # Setup restart PSW at absolute 0
+ larl %r3,.Lrestart_diag308_psw
+ og %r4,0(%r3) # Save PSW
+ lghi %r3,0
+ sturg %r4,%r3 # Use sturg, because of large pages
+ lghi %r1,1
+ lghi %r0,0
+ diag %r0,%r1,0x308
+restart_part2:
+ lhi %r0,0 # Load r0 with zero
+ lhi %r1,2 # Use mode 2 = ESAME (dump)
+ sigp %r1,%r0,SIGP_SET_ARCHITECTURE # Switch to ESAME mode
+ sam64 # Switch to 64 bit addressing mode
+ larl %r4,.Lctlregs # Restore control registers
+ lctlg %c0,%c15,0(%r4)
+ larl %r4,.Lfpctl # Restore floating point ctl register
+ lfpc 0(%r4)
+ larl %r4,.Lprefix # Restore prefix register
+ spx 0(%r4)
+ larl %r4,.Lcontinue_psw # Restore PSW flags
+ lpswe 0(%r4)
+.Lcontinue:
+ BR_EX_DMA_r14
+
+ .section .dma.data,"aw",@progbits
+.align 8
+.Lrestart_diag308_psw:
+ .long 0x00080000,0x80000000
+
+.align 8
+.Lcontinue_psw:
+ .quad 0,.Lcontinue
+
+.align 8
+.Lctlreg0:
+ .quad 0
+.Lctlregs:
+ .rept 16
+ .quad 0
+ .endr
+.Lfpctl:
+ .long 0
+.Lprefix:
+ .long 0
+.Lprefix_zero:
+ .long 0
diff --git a/arch/s390/hypfs/hypfs_diag0c.c b/arch/s390/hypfs/hypfs_diag0c.c
index 72e3140fafb5..3235e4d82f2d 100644
--- a/arch/s390/hypfs/hypfs_diag0c.c
+++ b/arch/s390/hypfs/hypfs_diag0c.c
@@ -16,26 +16,12 @@
#define DBFS_D0C_HDR_VERSION 0
/*
- * Execute diagnose 0c in 31 bit mode
- */
-static void diag0c(struct hypfs_diag0c_entry *entry)
-{
- diag_stat_inc(DIAG_STAT_X00C);
- asm volatile (
- " sam31\n"
- " diag %0,%0,0x0c\n"
- " sam64\n"
- : /* no output register */
- : "a" (entry)
- : "memory");
-}
-
-/*
* Get hypfs_diag0c_entry from CPU vector and store diag0c data
*/
static void diag0c_fn(void *data)
{
- diag0c(((void **) data)[smp_processor_id()]);
+ diag_stat_inc(DIAG_STAT_X00C);
+ diag_dma_ops.diag0c(((void **) data)[smp_processor_id()]);
}
/*
diff --git a/arch/s390/include/asm/diag.h b/arch/s390/include/asm/diag.h
index 19562be22b7e..0036eab14391 100644
--- a/arch/s390/include/asm/diag.h
+++ b/arch/s390/include/asm/diag.h
@@ -308,4 +308,17 @@ union diag318_info {
int diag204(unsigned long subcode, unsigned long size, void *addr);
int diag224(void *ptr);
int diag26c(void *req, void *resp, enum diag26c_sc subcode);
+
+struct hypfs_diag0c_entry;
+
+struct diag_ops {
+ int (*diag210)(struct diag210 *addr);
+ int (*diag26c)(void *req, void *resp, enum diag26c_sc subcode);
+ int (*diag14)(unsigned long rx, unsigned long ry1, unsigned long subcode);
+ void (*diag0c)(struct hypfs_diag0c_entry *entry);
+ void (*diag308_reset)(void);
+};
+
+extern struct diag_ops diag_dma_ops;
+extern struct diag210 *__diag210_tmp_dma;
#endif /* _ASM_S390_DIAG_H */
diff --git a/arch/s390/include/asm/extable.h b/arch/s390/include/asm/extable.h
index 80a4e5a9cb46..ae27f756b409 100644
--- a/arch/s390/include/asm/extable.h
+++ b/arch/s390/include/asm/extable.h
@@ -19,6 +19,11 @@ struct exception_table_entry
int insn, fixup;
};
+extern struct exception_table_entry *__start_dma_ex_table;
+extern struct exception_table_entry *__stop_dma_ex_table;
+
+const struct exception_table_entry *s390_search_extables(unsigned long addr);
+
static inline unsigned long extable_fixup(const struct exception_table_entry *x)
{
return (unsigned long)&x->fixup + x->fixup;
diff --git a/arch/s390/include/asm/ipl.h b/arch/s390/include/asm/ipl.h
index 420d39ebdc46..084e71b7272a 100644
--- a/arch/s390/include/asm/ipl.h
+++ b/arch/s390/include/asm/ipl.h
@@ -127,7 +127,6 @@ enum diag308_rc {
};
extern int diag308(unsigned long subcode, void *addr);
-extern void diag308_reset(void);
extern void store_status(void (*fn)(void *), void *data);
extern void lgr_info_log(void);
diff --git a/arch/s390/include/asm/linkage.h b/arch/s390/include/asm/linkage.h
index 1b95da3fdd64..7f22262b0e46 100644
--- a/arch/s390/include/asm/linkage.h
+++ b/arch/s390/include/asm/linkage.h
@@ -28,5 +28,12 @@
.long (_target) - . ; \
.previous
+#define EX_TABLE_DMA(_fault, _target) \
+ .section .dma.ex_table, "a" ; \
+ .align 4 ; \
+ .long (_fault) - . ; \
+ .long (_target) - . ; \
+ .previous
+
#endif /* __ASSEMBLY__ */
#endif
diff --git a/arch/s390/include/asm/sections.h b/arch/s390/include/asm/sections.h
index 29e55739b516..af670fa4b12a 100644
--- a/arch/s390/include/asm/sections.h
+++ b/arch/s390/include/asm/sections.h
@@ -23,4 +23,7 @@
*/
#define __bootdata_preserved(var) __section(.boot.preserved.data.var) var
+extern unsigned long __sdma, __edma;
+extern unsigned long __stext_dma, __etext_dma;
+
#endif
diff --git a/arch/s390/kernel/base.S b/arch/s390/kernel/base.S
index f268fca67e82..d6ee5978e273 100644
--- a/arch/s390/kernel/base.S
+++ b/arch/s390/kernel/base.S
@@ -79,71 +79,3 @@ disabled_wait_psw:
s390_base_pgm_handler_fn:
.quad 0
.previous
-
-#
-# Calls diag 308 subcode 1 and continues execution
-#
-ENTRY(diag308_reset)
- larl %r4,.Lctlregs # Save control registers
- stctg %c0,%c15,0(%r4)
- lg %r2,0(%r4) # Disable lowcore protection
- nilh %r2,0xefff
- larl %r4,.Lctlreg0
- stg %r2,0(%r4)
- lctlg %c0,%c0,0(%r4)
- larl %r4,.Lfpctl # Floating point control register
- stfpc 0(%r4)
- larl %r4,.Lprefix # Save prefix register
- stpx 0(%r4)
- larl %r4,.Lprefix_zero # Set prefix register to 0
- spx 0(%r4)
- larl %r4,.Lcontinue_psw # Save PSW flags
- epsw %r2,%r3
- stm %r2,%r3,0(%r4)
- larl %r4,.Lrestart_psw # Setup restart PSW at absolute 0
- lghi %r3,0
- lg %r4,0(%r4) # Save PSW
- sturg %r4,%r3 # Use sturg, because of large pages
- lghi %r1,1
- lghi %r0,0
- diag %r0,%r1,0x308
-.Lrestart_part2:
- lhi %r0,0 # Load r0 with zero
- lhi %r1,2 # Use mode 2 = ESAME (dump)
- sigp %r1,%r0,SIGP_SET_ARCHITECTURE # Switch to ESAME mode
- sam64 # Switch to 64 bit addressing mode
- larl %r4,.Lctlregs # Restore control registers
- lctlg %c0,%c15,0(%r4)
- larl %r4,.Lfpctl # Restore floating point ctl register
- lfpc 0(%r4)
- larl %r4,.Lprefix # Restore prefix register
- spx 0(%r4)
- larl %r4,.Lcontinue_psw # Restore PSW flags
- lpswe 0(%r4)
-.Lcontinue:
- BR_EX %r14
-.align 16
-.Lrestart_psw:
- .long 0x00080000,0x80000000 + .Lrestart_part2
-
- .section .data..nosave,"aw",@progbits
-.align 8
-.Lcontinue_psw:
- .quad 0,.Lcontinue
- .previous
-
- .section .bss
-.align 8
-.Lctlreg0:
- .quad 0
-.Lctlregs:
- .rept 16
- .quad 0
- .endr
-.Lfpctl:
- .long 0
-.Lprefix:
- .long 0
-.Lprefix_zero:
- .long 0
- .previous
diff --git a/arch/s390/kernel/diag.c b/arch/s390/kernel/diag.c
index 7edaa733a77f..e9dac9a24d3f 100644
--- a/arch/s390/kernel/diag.c
+++ b/arch/s390/kernel/diag.c
@@ -13,6 +13,7 @@
#include <linux/debugfs.h>
#include <asm/diag.h>
#include <asm/trace/diag.h>
+#include <asm/sections.h>
struct diag_stat {
unsigned int counter[NR_DIAG_STAT];
@@ -49,6 +50,9 @@ static const struct diag_desc diag_map[NR_DIAG_STAT] = {
[DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
};
+struct diag_ops __bootdata_preserved(diag_dma_ops);
+struct diag210 *__bootdata_preserved(__diag210_tmp_dma);
+
static int show_diag_stat(struct seq_file *m, void *v)
{
struct diag_stat *stat;
@@ -139,30 +143,10 @@ EXPORT_SYMBOL(diag_stat_inc_norecursion);
/*
* Diagnose 14: Input spool file manipulation
*/
-static inline int __diag14(unsigned long rx, unsigned long ry1,
- unsigned long subcode)
-{
- register unsigned long _ry1 asm("2") = ry1;
- register unsigned long _ry2 asm("3") = subcode;
- int rc = 0;
-
- asm volatile(
- " sam31\n"
- " diag %2,2,0x14\n"
- " sam64\n"
- " ipm %0\n"
- " srl %0,28\n"
- : "=d" (rc), "+d" (_ry2)
- : "d" (rx), "d" (_ry1)
- : "cc");
-
- return rc;
-}
-
int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
{
diag_stat_inc(DIAG_STAT_X014);
- return __diag14(rx, ry1, subcode);
+ return diag_dma_ops.diag14(rx, ry1, subcode);
}
EXPORT_SYMBOL(diag14);
@@ -195,30 +179,17 @@ EXPORT_SYMBOL(diag204);
*/
int diag210(struct diag210 *addr)
{
- /*
- * diag 210 needs its data below the 2GB border, so we
- * use a static data area to be sure
- */
- static struct diag210 diag210_tmp;
static DEFINE_SPINLOCK(diag210_lock);
unsigned long flags;
int ccode;
spin_lock_irqsave(&diag210_lock, flags);
- diag210_tmp = *addr;
+ *__diag210_tmp_dma = *addr;
diag_stat_inc(DIAG_STAT_X210);
- asm volatile(
- " lhi %0,-1\n"
- " sam31\n"
- " diag %1,0,0x210\n"
- "0: ipm %0\n"
- " srl %0,28\n"
- "1: sam64\n"
- EX_TABLE(0b, 1b)
- : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
-
- *addr = diag210_tmp;
+ ccode = diag_dma_ops.diag210(__diag210_tmp_dma);
+
+ *addr = *__diag210_tmp_dma;
spin_unlock_irqrestore(&diag210_lock, flags);
return ccode;
@@ -243,27 +214,9 @@ EXPORT_SYMBOL(diag224);
/*
* Diagnose 26C: Access Certain System Information
*/
-static inline int __diag26c(void *req, void *resp, enum diag26c_sc subcode)
-{
- register unsigned long _req asm("2") = (addr_t) req;
- register unsigned long _resp asm("3") = (addr_t) resp;
- register unsigned long _subcode asm("4") = subcode;
- register unsigned long _rc asm("5") = -EOPNOTSUPP;
-
- asm volatile(
- " sam31\n"
- " diag %[rx],%[ry],0x26c\n"
- "0: sam64\n"
- EX_TABLE(0b,0b)
- : "+d" (_rc)
- : [rx] "d" (_req), "d" (_resp), [ry] "d" (_subcode)
- : "cc", "memory");
- return _rc;
-}
-
int diag26c(void *req, void *resp, enum diag26c_sc subcode)
{
diag_stat_inc(DIAG_STAT_X26C);
- return __diag26c(req, resp, subcode);
+ return diag_dma_ops.diag26c(req, resp, subcode);
}
EXPORT_SYMBOL(diag26c);
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index ab09ada0e930..33f704c16bd3 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -139,7 +139,7 @@ static void early_pgm_check_handler(void)
unsigned long addr;
addr = S390_lowcore.program_old_psw.addr;
- fixup = search_exception_tables(addr);
+ fixup = s390_search_extables(addr);
if (!fixup)
disabled_wait(0);
/* Disable low address protection before storing into lowcore. */
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index 56491e636eab..5aea1a527443 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -26,7 +26,6 @@ ENTRY(startup_continue)
0: larl %r1,tod_clock_base
mvc 0(16,%r1),__LC_BOOT_CLOCK
larl %r13,.LPG1 # get base
- lctlg %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
larl %r0,boot_vdso_data
stg %r0,__LC_VDSO_PER_CPU
#
@@ -61,22 +60,6 @@ ENTRY(startup_continue)
.align 16
.LPG1:
-.Lctl: .quad 0x04040000 # cr0: AFP registers & secondary space
- .quad 0 # cr1: primary space segment table
- .quad .Lduct # cr2: dispatchable unit control table
- .quad 0 # cr3: instruction authorization
- .quad 0xffff # cr4: instruction authorization
- .quad .Lduct # cr5: primary-aste origin
- .quad 0 # cr6: I/O interrupts
- .quad 0 # cr7: secondary space segment table
- .quad 0 # cr8: access registers translation
- .quad 0 # cr9: tracing off
- .quad 0 # cr10: tracing off
- .quad 0 # cr11: tracing off
- .quad 0 # cr12: tracing off
- .quad 0 # cr13: home space segment table
- .quad 0xc0000000 # cr14: machine check handling off
- .quad .Llinkage_stack # cr15: linkage stack operations
.Lpcmsk:.quad 0x0000000180000000
.L4malign:.quad 0xffffffffffc00000
.Lscan2g:.quad 0x80000000 + 0x20000 - 8 # 2GB + 128K - 8
@@ -84,14 +67,5 @@ ENTRY(startup_continue)
.Lparmaddr:
.quad PARMAREA
.align 64
-.Lduct: .long 0,.Laste,.Laste,0,.Lduald,0,0,0
- .long 0,0,0,0,0,0,0,0
-.Laste: .quad 0,0xffffffffffffffff,0,0,0,0,0,0
- .align 128
-.Lduald:.rept 8
- .long 0x80000000,0,0,0 # invalid access-list entries
- .endr
-.Llinkage_stack:
- .long 0,0,0x89000000,0,0,0,0x8a000000,0
.Ldw: .quad 0x0002000180000000,0x0000000000000000
.Laregs:.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index e123c0df83f1..aa8fe768640e 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -1720,7 +1720,7 @@ void s390_reset_system(void)
/* Disable lowcore protection */
__ctl_clear_bit(0, 28);
- diag308_reset();
+ diag_dma_ops.diag308_reset();
}
#ifdef CONFIG_KEXEC_FILE
diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c
index 263426dcf97d..6f1388391620 100644
--- a/arch/s390/kernel/kprobes.c
+++ b/arch/s390/kernel/kprobes.c
@@ -573,7 +573,7 @@ static int kprobe_trap_handler(struct pt_regs *regs, int trapnr)
* In case the user-specified fault handler returned
* zero, try to fix up.
*/
- entry = search_exception_tables(regs->psw.addr);
+ entry = s390_search_extables(regs->psw.addr);
if (entry) {
regs->psw.addr = extable_fixup(entry);
return 1;
diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c
index cb582649aba6..4b998d639c32 100644
--- a/arch/s390/kernel/machine_kexec.c
+++ b/arch/s390/kernel/machine_kexec.c
@@ -253,6 +253,8 @@ void arch_crash_save_vmcoreinfo(void)
VMCOREINFO_SYMBOL(high_memory);
VMCOREINFO_LENGTH(lowcore_ptr, NR_CPUS);
mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
+ vmcoreinfo_append_str("SDMA=%lx\n", __sdma);
+ vmcoreinfo_append_str("EDMA=%lx\n", __edma);
}
void machine_shutdown(void)
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 94efb1eb34b6..4ccaf5ed96ee 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -101,6 +101,14 @@ unsigned long __bootdata(memory_end);
unsigned long __bootdata(max_physmem_end);
struct mem_detect_info __bootdata(mem_detect);
+struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
+struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
+unsigned long __bootdata_preserved(__swsusp_reset_dma);
+unsigned long __bootdata_preserved(__stext_dma);
+unsigned long __bootdata_preserved(__etext_dma);
+unsigned long __bootdata_preserved(__sdma);
+unsigned long __bootdata_preserved(__edma);
+
unsigned long VMALLOC_START;
EXPORT_SYMBOL(VMALLOC_START);
@@ -832,6 +840,7 @@ static void __init reserve_kernel(void)
memblock_reserve(0, HEAD_END);
memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
- (unsigned long)_stext);
+ memblock_reserve(__sdma, __edma - __sdma);
}
static void __init setup_memory(void)
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index bd197baf1dc3..88634fb0cc50 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -689,7 +689,7 @@ void __init smp_save_dump_cpus(void)
smp_save_cpu_regs(sa, addr, is_boot_cpu, page);
}
memblock_free(page, PAGE_SIZE);
- diag308_reset();
+ diag_dma_ops.diag308_reset();
pcpu_set_smt(0);
}
#endif /* CONFIG_CRASH_DUMP */
diff --git a/arch/s390/kernel/swsusp.S b/arch/s390/kernel/swsusp.S
index 993100c31d65..f5219ce11cc5 100644
--- a/arch/s390/kernel/swsusp.S
+++ b/arch/s390/kernel/swsusp.S
@@ -154,20 +154,13 @@ ENTRY(swsusp_arch_resume)
ptlb /* flush tlb */
/* Reset System */
- larl %r1,restart_entry
- larl %r2,.Lrestart_diag308_psw
- og %r1,0(%r2)
- stg %r1,0(%r0)
larl %r1,.Lnew_pgm_check_psw
epsw %r2,%r3
stm %r2,%r3,0(%r1)
mvc __LC_PGM_NEW_PSW(16,%r0),0(%r1)
- lghi %r0,0
- diag %r0,%r0,0x308
-restart_entry:
- lhi %r1,1
- sigp %r1,%r0,SIGP_SET_ARCHITECTURE
- sam64
+ larl %r1,__swsusp_reset_dma
+ lg %r1,0(%r1)
+ BASR_EX %r14,%r1
#ifdef CONFIG_SMP
larl %r1,smp_cpu_mt_shift
icm %r1,15,0(%r1)
@@ -275,8 +268,6 @@ restore_registers:
.Lpanic_string:
.asciz "Resume not possible because suspend CPU is no longer available\n"
.align 8
-.Lrestart_diag308_psw:
- .long 0x00080000,0x80000000
.Lrestart_suspend_psw:
.quad 0x0000000180000000,restart_suspend
.Lnew_pgm_check_psw:
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 8003b38c1688..82e81a9f7112 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -49,7 +49,7 @@ void do_report_trap(struct pt_regs *regs, int si_signo, int si_code, char *str)
report_user_fault(regs, si_signo, 0);
} else {
const struct exception_table_entry *fixup;
- fixup = search_exception_tables(regs->psw.addr);
+ fixup = s390_search_extables(regs->psw.addr);
if (fixup)
regs->psw.addr = extable_fixup(fixup);
else {
@@ -263,5 +263,6 @@ NOKPROBE_SYMBOL(kernel_stack_overflow);
void __init trap_init(void)
{
+ sort_extable(__start_dma_ex_table, __stop_dma_ex_table);
local_mcck_enable();
}
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 11613362c4e7..c220399ae196 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -247,12 +247,24 @@ static noinline void do_sigsegv(struct pt_regs *regs, int si_code)
current);
}
+const struct exception_table_entry *s390_search_extables(unsigned long addr)
+{
+ const struct exception_table_entry *fixup;
+
+ fixup = search_extable(__start_dma_ex_table,
+ __stop_dma_ex_table - __start_dma_ex_table,
+ addr);
+ if (!fixup)
+ fixup = search_exception_tables(addr);
+ return fixup;
+}
+
static noinline void do_no_context(struct pt_regs *regs)
{
const struct exception_table_entry *fixup;
/* Are we prepared to handle this kernel fault? */
- fixup = search_exception_tables(regs->psw.addr);
+ fixup = s390_search_extables(regs->psw.addr);
if (fixup) {
regs->psw.addr = extable_fixup(fixup);
return;
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 0472e27febdf..b403fa14847d 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -413,6 +413,8 @@ void __init vmem_map_init(void)
__set_memory((unsigned long)_sinittext,
(unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT,
SET_MEMORY_RO | SET_MEMORY_X);
+ __set_memory(__stext_dma, (__etext_dma - __stext_dma) >> PAGE_SHIFT,
+ SET_MEMORY_RO | SET_MEMORY_X);
pr_info("Write protected kernel read-only data: %luk\n",
(unsigned long)(__end_rodata - _stext) >> 10);
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.