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Diffstat (limited to 'include/asm-v850/entry.h')
| -rw-r--r-- | include/asm-v850/entry.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/include/asm-v850/entry.h b/include/asm-v850/entry.h new file mode 100644 index 00000000000..d9df8ac4858 --- /dev/null +++ b/include/asm-v850/entry.h @@ -0,0 +1,113 @@ +/* + * include/asm-v850/entry.h -- Definitions used by low-level trap handlers + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#ifndef __V850_ENTRY_H__ +#define __V850_ENTRY_H__ + + +#include <asm/ptrace.h> +#include <asm/machdep.h> + + +/* These are special variables using by the kernel trap/interrupt code + to save registers in, at a time when there are no spare registers we + can use to do so, and we can't depend on the value of the stack + pointer. This means that they must be within a signed 16-bit + displacement of 0x00000000. */ + +#define KERNEL_VAR_SPACE_ADDR R0_RAM_ADDR + +#ifdef __ASSEMBLY__ +#define KERNEL_VAR(addr) addr[r0] +#else +#define KERNEL_VAR(addr) (*(volatile unsigned long *)(addr)) +#endif + +/* Kernel stack pointer, 4 bytes. */ +#define KSP_ADDR (KERNEL_VAR_SPACE_ADDR + 0) +#define KSP KERNEL_VAR (KSP_ADDR) +/* 1 if in kernel-mode, 0 if in user mode, 1 byte. */ +#define KM_ADDR (KERNEL_VAR_SPACE_ADDR + 4) +#define KM KERNEL_VAR (KM_ADDR) +/* Temporary storage for interrupt handlers, 4 bytes. */ +#define INT_SCRATCH_ADDR (KERNEL_VAR_SPACE_ADDR + 8) +#define INT_SCRATCH KERNEL_VAR (INT_SCRATCH_ADDR) +/* Where the stack-pointer is saved when jumping to various sorts of + interrupt handlers. ENTRY_SP is used by everything except NMIs, + which have their own location. Higher-priority NMIs can clobber the + value written by a lower priority NMI, since they can't be disabled, + but that's OK, because only NMI0 (the lowest-priority one) is allowed + to return. */ +#define ENTRY_SP_ADDR (KERNEL_VAR_SPACE_ADDR + 12) +#define ENTRY_SP KERNEL_VAR (ENTRY_SP_ADDR) +#define NMI_ENTRY_SP_ADDR (KERNEL_VAR_SPACE_ADDR + 16) +#define NMI_ENTRY_SP KERNEL_VAR (NMI_ENTRY_SP_ADDR) + +#ifdef CONFIG_RESET_GUARD +/* Used to detect unexpected resets (since the v850 has no MMU, any call + through a null pointer will jump to the reset vector). We detect + such resets by checking for a magic value, RESET_GUARD_ACTIVE, in + this location. Properly resetting the machine stores zero there, so + it shouldn't trigger the guard; the power-on value is uncertain, but + it's unlikely to be RESET_GUARD_ACTIVE. */ +#define RESET_GUARD_ADDR (KERNEL_VAR_SPACE_ADDR + 28) +#define RESET_GUARD KERNEL_VAR (RESET_GUARD_ADDR) +#define RESET_GUARD_ACTIVE 0xFAB4BEEF +#endif /* CONFIG_RESET_GUARD */ + +#ifdef CONFIG_V850E_HIGHRES_TIMER +#define HIGHRES_TIMER_SLOW_TICKS_ADDR (KERNEL_VAR_SPACE_ADDR + 32) +#define HIGHRES_TIMER_SLOW_TICKS KERNEL_VAR (HIGHRES_TIMER_SLOW_TICKS_ADDR) +#endif /* CONFIG_V850E_HIGHRES_TIMER */ + +#ifndef __ASSEMBLY__ + +#ifdef CONFIG_RESET_GUARD +/* Turn off reset guard, so that resetting the machine works normally. + This should be called in the various machine_halt, etc., functions. */ +static inline void disable_reset_guard (void) +{ + RESET_GUARD = 0; +} +#endif /* CONFIG_RESET_GUARD */ + +#endif /* !__ASSEMBLY__ */ + + +/* A `state save frame' is a struct pt_regs preceded by some extra space + suitable for a function call stack frame. */ + +/* Amount of room on the stack reserved for arguments and to satisfy the + C calling conventions, in addition to the space used by the struct + pt_regs that actually holds saved values. */ +#define STATE_SAVE_ARG_SPACE (6*4) /* Up to six arguments. */ + + +#ifdef __ASSEMBLY__ + +/* The size of a state save frame. */ +#define STATE_SAVE_SIZE (PT_SIZE + STATE_SAVE_ARG_SPACE) + +#else /* !__ASSEMBLY__ */ + +/* The size of a state save frame. */ +#define STATE_SAVE_SIZE (sizeof (struct pt_regs) + STATE_SAVE_ARG_SPACE) + +#endif /* __ASSEMBLY__ */ + + +/* Offset of the struct pt_regs in a state save frame. */ +#define STATE_SAVE_PT_OFFSET STATE_SAVE_ARG_SPACE + + +#endif /* __V850_ENTRY_H__ */ |