1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
114 lines
3.9 KiB
C
114 lines
3.9 KiB
C
/*
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* include/asm-v850/entry.h -- Definitions used by low-level trap handlers
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*
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* Copyright (C) 2001,02,03 NEC Electronics Corporation
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* Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* Written by Miles Bader <miles@gnu.org>
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*/
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#ifndef __V850_ENTRY_H__
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#define __V850_ENTRY_H__
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#include <asm/ptrace.h>
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#include <asm/machdep.h>
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/* These are special variables using by the kernel trap/interrupt code
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to save registers in, at a time when there are no spare registers we
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can use to do so, and we can't depend on the value of the stack
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pointer. This means that they must be within a signed 16-bit
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displacement of 0x00000000. */
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#define KERNEL_VAR_SPACE_ADDR R0_RAM_ADDR
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#ifdef __ASSEMBLY__
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#define KERNEL_VAR(addr) addr[r0]
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#else
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#define KERNEL_VAR(addr) (*(volatile unsigned long *)(addr))
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#endif
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/* Kernel stack pointer, 4 bytes. */
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#define KSP_ADDR (KERNEL_VAR_SPACE_ADDR + 0)
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#define KSP KERNEL_VAR (KSP_ADDR)
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/* 1 if in kernel-mode, 0 if in user mode, 1 byte. */
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#define KM_ADDR (KERNEL_VAR_SPACE_ADDR + 4)
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#define KM KERNEL_VAR (KM_ADDR)
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/* Temporary storage for interrupt handlers, 4 bytes. */
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#define INT_SCRATCH_ADDR (KERNEL_VAR_SPACE_ADDR + 8)
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#define INT_SCRATCH KERNEL_VAR (INT_SCRATCH_ADDR)
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/* Where the stack-pointer is saved when jumping to various sorts of
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interrupt handlers. ENTRY_SP is used by everything except NMIs,
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which have their own location. Higher-priority NMIs can clobber the
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value written by a lower priority NMI, since they can't be disabled,
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but that's OK, because only NMI0 (the lowest-priority one) is allowed
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to return. */
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#define ENTRY_SP_ADDR (KERNEL_VAR_SPACE_ADDR + 12)
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#define ENTRY_SP KERNEL_VAR (ENTRY_SP_ADDR)
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#define NMI_ENTRY_SP_ADDR (KERNEL_VAR_SPACE_ADDR + 16)
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#define NMI_ENTRY_SP KERNEL_VAR (NMI_ENTRY_SP_ADDR)
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#ifdef CONFIG_RESET_GUARD
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/* Used to detect unexpected resets (since the v850 has no MMU, any call
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through a null pointer will jump to the reset vector). We detect
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such resets by checking for a magic value, RESET_GUARD_ACTIVE, in
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this location. Properly resetting the machine stores zero there, so
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it shouldn't trigger the guard; the power-on value is uncertain, but
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it's unlikely to be RESET_GUARD_ACTIVE. */
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#define RESET_GUARD_ADDR (KERNEL_VAR_SPACE_ADDR + 28)
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#define RESET_GUARD KERNEL_VAR (RESET_GUARD_ADDR)
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#define RESET_GUARD_ACTIVE 0xFAB4BEEF
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#endif /* CONFIG_RESET_GUARD */
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#ifdef CONFIG_V850E_HIGHRES_TIMER
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#define HIGHRES_TIMER_SLOW_TICKS_ADDR (KERNEL_VAR_SPACE_ADDR + 32)
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#define HIGHRES_TIMER_SLOW_TICKS KERNEL_VAR (HIGHRES_TIMER_SLOW_TICKS_ADDR)
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#endif /* CONFIG_V850E_HIGHRES_TIMER */
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_RESET_GUARD
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/* Turn off reset guard, so that resetting the machine works normally.
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This should be called in the various machine_halt, etc., functions. */
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static inline void disable_reset_guard (void)
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{
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RESET_GUARD = 0;
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}
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#endif /* CONFIG_RESET_GUARD */
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#endif /* !__ASSEMBLY__ */
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/* A `state save frame' is a struct pt_regs preceded by some extra space
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suitable for a function call stack frame. */
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/* Amount of room on the stack reserved for arguments and to satisfy the
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C calling conventions, in addition to the space used by the struct
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pt_regs that actually holds saved values. */
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#define STATE_SAVE_ARG_SPACE (6*4) /* Up to six arguments. */
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#ifdef __ASSEMBLY__
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/* The size of a state save frame. */
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#define STATE_SAVE_SIZE (PT_SIZE + STATE_SAVE_ARG_SPACE)
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#else /* !__ASSEMBLY__ */
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/* The size of a state save frame. */
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#define STATE_SAVE_SIZE (sizeof (struct pt_regs) + STATE_SAVE_ARG_SPACE)
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#endif /* __ASSEMBLY__ */
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/* Offset of the struct pt_regs in a state save frame. */
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#define STATE_SAVE_PT_OFFSET STATE_SAVE_ARG_SPACE
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#endif /* __V850_ENTRY_H__ */
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