initial risc-v exampleHEADmaster

1 files changed, 150 insertions, 0 deletions

diff --git a/riscv/include/asm/processor.h b/riscv/include/asm/processor.h
new file mode 100644
index 0000000..e1944ff
--- /dev/null
+++ b/riscv/include/asm/processor.h
@@ -0,0 +1,150 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ */
+
+#ifndef _ASM_RISCV_PROCESSOR_H
+#define _ASM_RISCV_PROCESSOR_H
+
+#include <linux/const.h>
+#include <linux/cache.h>
+#include <linux/prctl.h>
+
+#include <vdso/processor.h>
+
+#include <asm/ptrace.h>
+
+#ifdef CONFIG_64BIT
+#define DEFAULT_MAP_WINDOW	(UL(1) << (MMAP_VA_BITS - 1))
+#define STACK_TOP_MAX		TASK_SIZE
+
+#define arch_get_mmap_end(addr, len, flags)			\
+({								\
+	unsigned long mmap_end;					\
+	typeof(addr) _addr = (addr);				\
+	if ((_addr) == 0 || (IS_ENABLED(CONFIG_COMPAT) && is_compat_task())) \
+		mmap_end = STACK_TOP_MAX;			\
+	else if ((_addr) >= VA_USER_SV57)			\
+		mmap_end = STACK_TOP_MAX;			\
+	else if ((((_addr) >= VA_USER_SV48)) && (VA_BITS >= VA_BITS_SV48)) \
+		mmap_end = VA_USER_SV48;			\
+	else							\
+		mmap_end = VA_USER_SV39;			\
+	mmap_end;						\
+})
+
+#define arch_get_mmap_base(addr, base)				\
+({								\
+	unsigned long mmap_base;				\
+	typeof(addr) _addr = (addr);				\
+	typeof(base) _base = (base);				\
+	unsigned long rnd_gap = DEFAULT_MAP_WINDOW - (_base);	\
+	if ((_addr) == 0 || (IS_ENABLED(CONFIG_COMPAT) && is_compat_task())) \
+		mmap_base = (_base);				\
+	else if (((_addr) >= VA_USER_SV57) && (VA_BITS >= VA_BITS_SV57)) \
+		mmap_base = VA_USER_SV57 - rnd_gap;		\
+	else if ((((_addr) >= VA_USER_SV48)) && (VA_BITS >= VA_BITS_SV48)) \
+		mmap_base = VA_USER_SV48 - rnd_gap;		\
+	else							\
+		mmap_base = VA_USER_SV39 - rnd_gap;		\
+	mmap_base;						\
+})
+
+#else
+#define DEFAULT_MAP_WINDOW	TASK_SIZE
+#define STACK_TOP_MAX		TASK_SIZE
+#endif
+#define STACK_ALIGN		16
+
+#define STACK_TOP		DEFAULT_MAP_WINDOW
+
+/*
+ * This decides where the kernel will search for a free chunk of vm
+ * space during mmap's.
+ */
+#ifdef CONFIG_64BIT
+#define TASK_UNMAPPED_BASE	PAGE_ALIGN((UL(1) << MMAP_MIN_VA_BITS) / 3)
+#else
+#define TASK_UNMAPPED_BASE	PAGE_ALIGN(TASK_SIZE / 3)
+#endif
+
+#ifndef __ASSEMBLY__
+
+struct task_struct;
+struct pt_regs;
+
+/* CPU-specific state of a task */
+struct thread_struct {
+	/* Callee-saved registers */
+	unsigned long ra;
+	unsigned long sp;	/* Kernel mode stack */
+	unsigned long s[12];	/* s[0]: frame pointer */
+	struct __riscv_d_ext_state fstate;
+	unsigned long bad_cause;
+	unsigned long vstate_ctrl;
+	struct __riscv_v_ext_state vstate;
+	unsigned long align_ctl;
+};
+
+/* Whitelist the fstate from the task_struct for hardened usercopy */
+static inline void arch_thread_struct_whitelist(unsigned long *offset,
+						unsigned long *size)
+{
+	*offset = offsetof(struct thread_struct, fstate);
+	*size = sizeof_field(struct thread_struct, fstate);
+}
+
+#define INIT_THREAD {					\
+	.sp = sizeof(init_stack) + (long)&init_stack,	\
+	.align_ctl = PR_UNALIGN_NOPRINT,		\
+}
+
+#define task_pt_regs(tsk)						\
+	((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE		\
+			    - ALIGN(sizeof(struct pt_regs), STACK_ALIGN)))
+
+#define KSTK_EIP(tsk)		(task_pt_regs(tsk)->epc)
+#define KSTK_ESP(tsk)		(task_pt_regs(tsk)->sp)
+
+
+/* Do necessary setup to start up a newly executed thread. */
+extern void start_thread(struct pt_regs *regs,
+			unsigned long pc, unsigned long sp);
+
+extern unsigned long __get_wchan(struct task_struct *p);
+
+
+static inline void wait_for_interrupt(void)
+{
+	__asm__ __volatile__ ("wfi");
+}
+
+extern phys_addr_t dma32_phys_limit;
+
+struct device_node;
+int riscv_of_processor_hartid(struct device_node *node, unsigned long *hartid);
+int riscv_early_of_processor_hartid(struct device_node *node, unsigned long *hartid);
+int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid);
+
+extern void riscv_fill_hwcap(void);
+extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
+
+extern unsigned long signal_minsigstksz __ro_after_init;
+
+#ifdef CONFIG_RISCV_ISA_V
+/* Userspace interface for PR_RISCV_V_{SET,GET}_VS prctl()s: */
+#define RISCV_V_SET_CONTROL(arg)	riscv_v_vstate_ctrl_set_current(arg)
+#define RISCV_V_GET_CONTROL()		riscv_v_vstate_ctrl_get_current()
+extern long riscv_v_vstate_ctrl_set_current(unsigned long arg);
+extern long riscv_v_vstate_ctrl_get_current(void);
+#endif /* CONFIG_RISCV_ISA_V */
+
+extern int get_unalign_ctl(struct task_struct *tsk, unsigned long addr);
+extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
+
+#define GET_UNALIGN_CTL(tsk, addr)	get_unalign_ctl((tsk), (addr))
+#define SET_UNALIGN_CTL(tsk, val)	set_unalign_ctl((tsk), (val))
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_RISCV_PROCESSOR_H */