1 files changed, 386 insertions, 0 deletions
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
new file mode 100644
index 000000000..7f2953c15
--- /dev/null
+++ b/arch/s390/include/asm/processor.h
@@ -0,0 +1,386 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  S390 version
+ *    Copyright IBM Corp. 1999
+ *    Author(s): Hartmut Penner (hp@de.ibm.com),
+ *               Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ *  Derived from "include/asm-i386/processor.h"
+ *    Copyright (C) 1994, Linus Torvalds
+ */
+
+#ifndef __ASM_S390_PROCESSOR_H
+#define __ASM_S390_PROCESSOR_H
+
+#include <linux/const.h>
+
+#define CIF_MCCK_PENDING	0	/* machine check handling is pending */
+#define CIF_ASCE_PRIMARY	1	/* primary asce needs fixup / uaccess */
+#define CIF_ASCE_SECONDARY	2	/* secondary asce needs fixup / uaccess */
+#define CIF_NOHZ_DELAY		3	/* delay HZ disable for a tick */
+#define CIF_FPU			4	/* restore FPU registers */
+#define CIF_IGNORE_IRQ		5	/* ignore interrupt (for udelay) */
+#define CIF_ENABLED_WAIT	6	/* in enabled wait state */
+#define CIF_MCCK_GUEST		7	/* machine check happening in guest */
+#define CIF_DEDICATED_CPU	8	/* this CPU is dedicated */
+
+#define _CIF_MCCK_PENDING	_BITUL(CIF_MCCK_PENDING)
+#define _CIF_ASCE_PRIMARY	_BITUL(CIF_ASCE_PRIMARY)
+#define _CIF_ASCE_SECONDARY	_BITUL(CIF_ASCE_SECONDARY)
+#define _CIF_NOHZ_DELAY		_BITUL(CIF_NOHZ_DELAY)
+#define _CIF_FPU		_BITUL(CIF_FPU)
+#define _CIF_IGNORE_IRQ		_BITUL(CIF_IGNORE_IRQ)
+#define _CIF_ENABLED_WAIT	_BITUL(CIF_ENABLED_WAIT)
+#define _CIF_MCCK_GUEST		_BITUL(CIF_MCCK_GUEST)
+#define _CIF_DEDICATED_CPU	_BITUL(CIF_DEDICATED_CPU)
+
+#ifndef __ASSEMBLY__
+
+#include <linux/linkage.h>
+#include <linux/irqflags.h>
+#include <asm/cpu.h>
+#include <asm/page.h>
+#include <asm/ptrace.h>
+#include <asm/setup.h>
+#include <asm/runtime_instr.h>
+#include <asm/fpu/types.h>
+#include <asm/fpu/internal.h>
+
+static inline void set_cpu_flag(int flag)
+{
+	S390_lowcore.cpu_flags |= (1UL << flag);
+}
+
+static inline void clear_cpu_flag(int flag)
+{
+	S390_lowcore.cpu_flags &= ~(1UL << flag);
+}
+
+static inline int test_cpu_flag(int flag)
+{
+	return !!(S390_lowcore.cpu_flags & (1UL << flag));
+}
+
+/*
+ * Test CIF flag of another CPU. The caller needs to ensure that
+ * CPU hotplug can not happen, e.g. by disabling preemption.
+ */
+static inline int test_cpu_flag_of(int flag, int cpu)
+{
+	struct lowcore *lc = lowcore_ptr[cpu];
+	return !!(lc->cpu_flags & (1UL << flag));
+}
+
+#define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY)
+
+/*
+ * Default implementation of macro that returns current
+ * instruction pointer ("program counter").
+ */
+#define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
+
+static inline void get_cpu_id(struct cpuid *ptr)
+{
+	asm volatile("stidp %0" : "=Q" (*ptr));
+}
+
+void s390_adjust_jiffies(void);
+void s390_update_cpu_mhz(void);
+void cpu_detect_mhz_feature(void);
+
+extern const struct seq_operations cpuinfo_op;
+extern int sysctl_ieee_emulation_warnings;
+extern void execve_tail(void);
+extern void __bpon(void);
+
+/*
+ * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
+ */
+
+#define TASK_SIZE_OF(tsk)	(test_tsk_thread_flag(tsk, TIF_31BIT) ? \
+					(1UL << 31) : -PAGE_SIZE)
+#define TASK_UNMAPPED_BASE	(test_thread_flag(TIF_31BIT) ? \
+					(1UL << 30) : (1UL << 41))
+#define TASK_SIZE		TASK_SIZE_OF(current)
+#define TASK_SIZE_MAX		(-PAGE_SIZE)
+
+#define STACK_TOP		(test_thread_flag(TIF_31BIT) ? \
+					(1UL << 31) : (1UL << 42))
+#define STACK_TOP_MAX		(1UL << 42)
+
+#define HAVE_ARCH_PICK_MMAP_LAYOUT
+
+typedef unsigned int mm_segment_t;
+
+/*
+ * Thread structure
+ */
+struct thread_struct {
+	unsigned int  acrs[NUM_ACRS];
+        unsigned long ksp;              /* kernel stack pointer             */
+	unsigned long user_timer;	/* task cputime in user space */
+	unsigned long guest_timer;	/* task cputime in kvm guest */
+	unsigned long system_timer;	/* task cputime in kernel space */
+	unsigned long hardirq_timer;	/* task cputime in hardirq context */
+	unsigned long softirq_timer;	/* task cputime in softirq context */
+	unsigned long sys_call_table;	/* system call table address */
+	mm_segment_t mm_segment;
+	unsigned long gmap_addr;	/* address of last gmap fault. */
+	unsigned int gmap_write_flag;	/* gmap fault write indication */
+	unsigned int gmap_int_code;	/* int code of last gmap fault */
+	unsigned int gmap_pfault;	/* signal of a pending guest pfault */
+	/* Per-thread information related to debugging */
+	struct per_regs per_user;	/* User specified PER registers */
+	struct per_event per_event;	/* Cause of the last PER trap */
+	unsigned long per_flags;	/* Flags to control debug behavior */
+	unsigned int system_call;	/* system call number in signal */
+	unsigned long last_break;	/* last breaking-event-address. */
+        /* pfault_wait is used to block the process on a pfault event */
+	unsigned long pfault_wait;
+	struct list_head list;
+	/* cpu runtime instrumentation */
+	struct runtime_instr_cb *ri_cb;
+	struct gs_cb *gs_cb;		/* Current guarded storage cb */
+	struct gs_cb *gs_bc_cb;		/* Broadcast guarded storage cb */
+	unsigned char trap_tdb[256];	/* Transaction abort diagnose block */
+	/*
+	 * Warning: 'fpu' is dynamically-sized. It *MUST* be at
+	 * the end.
+	 */
+	struct fpu fpu;			/* FP and VX register save area */
+};
+
+/* Flag to disable transactions. */
+#define PER_FLAG_NO_TE			1UL
+/* Flag to enable random transaction aborts. */
+#define PER_FLAG_TE_ABORT_RAND		2UL
+/* Flag to specify random transaction abort mode:
+ * - abort each transaction at a random instruction before TEND if set.
+ * - abort random transactions at a random instruction if cleared.
+ */
+#define PER_FLAG_TE_ABORT_RAND_TEND	4UL
+
+typedef struct thread_struct thread_struct;
+
+/*
+ * Stack layout of a C stack frame.
+ */
+#ifndef __PACK_STACK
+struct stack_frame {
+	unsigned long back_chain;
+	unsigned long empty1[5];
+	unsigned long gprs[10];
+	unsigned int  empty2[8];
+};
+#else
+struct stack_frame {
+	unsigned long empty1[5];
+	unsigned int  empty2[8];
+	unsigned long gprs[10];
+	unsigned long back_chain;
+};
+#endif
+
+#define ARCH_MIN_TASKALIGN	8
+
+#define INIT_THREAD {							\
+	.ksp = sizeof(init_stack) + (unsigned long) &init_stack,	\
+	.fpu.regs = (void *) init_task.thread.fpu.fprs,			\
+}
+
+/*
+ * Do necessary setup to start up a new thread.
+ */
+#define start_thread(regs, new_psw, new_stackp) do {			\
+	regs->psw.mask	= PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA;	\
+	regs->psw.addr	= new_psw;					\
+	regs->gprs[15]	= new_stackp;					\
+	execve_tail();							\
+} while (0)
+
+#define start_thread31(regs, new_psw, new_stackp) do {			\
+	regs->psw.mask	= PSW_USER_BITS | PSW_MASK_BA;			\
+	regs->psw.addr	= new_psw;					\
+	regs->gprs[15]	= new_stackp;					\
+	crst_table_downgrade(current->mm);				\
+	execve_tail();							\
+} while (0)
+
+/* Forward declaration, a strange C thing */
+struct task_struct;
+struct mm_struct;
+struct seq_file;
+struct pt_regs;
+
+typedef int (*dump_trace_func_t)(void *data, unsigned long address, int reliable);
+void dump_trace(dump_trace_func_t func, void *data,
+		struct task_struct *task, unsigned long sp);
+void show_registers(struct pt_regs *regs);
+
+void show_cacheinfo(struct seq_file *m);
+
+/* Free all resources held by a thread. */
+static inline void release_thread(struct task_struct *tsk) { }
+
+/* Free guarded storage control block */
+void guarded_storage_release(struct task_struct *tsk);
+
+unsigned long get_wchan(struct task_struct *p);
+#define task_pt_regs(tsk) ((struct pt_regs *) \
+        (task_stack_page(tsk) + THREAD_SIZE) - 1)
+#define KSTK_EIP(tsk)	(task_pt_regs(tsk)->psw.addr)
+#define KSTK_ESP(tsk)	(task_pt_regs(tsk)->gprs[15])
+
+/* Has task runtime instrumentation enabled ? */
+#define is_ri_task(tsk) (!!(tsk)->thread.ri_cb)
+
+static inline unsigned long current_stack_pointer(void)
+{
+	unsigned long sp;
+
+	asm volatile("la %0,0(15)" : "=a" (sp));
+	return sp;
+}
+
+static inline unsigned short stap(void)
+{
+	unsigned short cpu_address;
+
+	asm volatile("stap %0" : "=Q" (cpu_address));
+	return cpu_address;
+}
+
+/*
+ * Give up the time slice of the virtual PU.
+ */
+#define cpu_relax_yield cpu_relax_yield
+void cpu_relax_yield(void);
+
+#define cpu_relax() barrier()
+
+#define ECAG_CACHE_ATTRIBUTE	0
+#define ECAG_CPU_ATTRIBUTE	1
+
+static inline unsigned long __ecag(unsigned int asi, unsigned char parm)
+{
+	unsigned long val;
+
+	asm volatile(".insn	rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
+		     : "=d" (val) : "a" (asi << 8 | parm));
+	return val;
+}
+
+static inline void psw_set_key(unsigned int key)
+{
+	asm volatile("spka 0(%0)" : : "d" (key));
+}
+
+/*
+ * Set PSW to specified value.
+ */
+static inline void __load_psw(psw_t psw)
+{
+	asm volatile("lpswe %0" : : "Q" (psw) : "cc");
+}
+
+/*
+ * Set PSW mask to specified value, while leaving the
+ * PSW addr pointing to the next instruction.
+ */
+static inline void __load_psw_mask(unsigned long mask)
+{
+	unsigned long addr;
+	psw_t psw;
+
+	psw.mask = mask;
+
+	asm volatile(
+		"	larl	%0,1f\n"
+		"	stg	%0,%O1+8(%R1)\n"
+		"	lpswe	%1\n"
+		"1:"
+		: "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
+}
+
+/*
+ * Extract current PSW mask
+ */
+static inline unsigned long __extract_psw(void)
+{
+	unsigned int reg1, reg2;
+
+	asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2));
+	return (((unsigned long) reg1) << 32) | ((unsigned long) reg2);
+}
+
+static inline void local_mcck_enable(void)
+{
+	__load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
+}
+
+static inline void local_mcck_disable(void)
+{
+	__load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK);
+}
+
+/*
+ * Rewind PSW instruction address by specified number of bytes.
+ */
+static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
+{
+	unsigned long mask;
+
+	mask = (psw.mask & PSW_MASK_EA) ? -1UL :
+	       (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
+					  (1UL << 24) - 1;
+	return (psw.addr - ilc) & mask;
+}
+
+/*
+ * Function to stop a processor until the next interrupt occurs
+ */
+void enabled_wait(void);
+
+/*
+ * Function to drop a processor into disabled wait state
+ */
+static inline void __noreturn disabled_wait(unsigned long code)
+{
+	psw_t psw;
+
+	psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
+	psw.addr = code;
+	__load_psw(psw);
+	while (1);
+}
+
+/*
+ * Basic Machine Check/Program Check Handler.
+ */
+
+extern void s390_base_mcck_handler(void);
+extern void s390_base_pgm_handler(void);
+extern void s390_base_ext_handler(void);
+
+extern void (*s390_base_mcck_handler_fn)(void);
+extern void (*s390_base_pgm_handler_fn)(void);
+extern void (*s390_base_ext_handler_fn)(void);
+
+#define ARCH_LOW_ADDRESS_LIMIT	0x7fffffffUL
+
+extern int memcpy_real(void *, void *, size_t);
+extern void memcpy_absolute(void *, void *, size_t);
+
+#define mem_assign_absolute(dest, val) do {			\
+	__typeof__(dest) __tmp = (val);				\
+								\
+	BUILD_BUG_ON(sizeof(__tmp) != sizeof(val));		\
+	memcpy_absolute(&(dest), &__tmp, sizeof(__tmp));	\
+} while (0)
+
+extern int s390_isolate_bp(void);
+extern int s390_isolate_bp_guest(void);
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __ASM_S390_PROCESSOR_H */