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Diffstat (limited to 'kernel/arch/m68k/include/asm/processor.h')
| -rw-r--r-- | kernel/arch/m68k/include/asm/processor.h | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/kernel/arch/m68k/include/asm/processor.h b/kernel/arch/m68k/include/asm/processor.h new file mode 100644 index 000000000..20dda1d4b --- /dev/null +++ b/kernel/arch/m68k/include/asm/processor.h @@ -0,0 +1,181 @@ +/* + * include/asm-m68k/processor.h + * + * Copyright (C) 1995 Hamish Macdonald + */ + +#ifndef __ASM_M68K_PROCESSOR_H +#define __ASM_M68K_PROCESSOR_H + +/* + * Default implementation of macro that returns current + * instruction pointer ("program counter"). + */ +#define current_text_addr() ({ __label__ _l; _l: &&_l;}) + +#include <linux/thread_info.h> +#include <asm/segment.h> +#include <asm/fpu.h> +#include <asm/ptrace.h> + +static inline unsigned long rdusp(void) +{ +#ifdef CONFIG_COLDFIRE_SW_A7 + extern unsigned int sw_usp; + return sw_usp; +#else + register unsigned long usp __asm__("a0"); + /* move %usp,%a0 */ + __asm__ __volatile__(".word 0x4e68" : "=a" (usp)); + return usp; +#endif +} + +static inline void wrusp(unsigned long usp) +{ +#ifdef CONFIG_COLDFIRE_SW_A7 + extern unsigned int sw_usp; + sw_usp = usp; +#else + register unsigned long a0 __asm__("a0") = usp; + /* move %a0,%usp */ + __asm__ __volatile__(".word 0x4e60" : : "a" (a0) ); +#endif +} + +/* + * User space process size: 3.75GB. This is hardcoded into a few places, + * so don't change it unless you know what you are doing. + */ +#ifdef CONFIG_MMU +#if defined(CONFIG_COLDFIRE) +#define TASK_SIZE (0xC0000000UL) +#elif defined(CONFIG_SUN3) +#define TASK_SIZE (0x0E000000UL) +#else +#define TASK_SIZE (0xF0000000UL) +#endif +#else +#define TASK_SIZE (0xFFFFFFFFUL) +#endif + +#ifdef __KERNEL__ +#define STACK_TOP TASK_SIZE +#define STACK_TOP_MAX STACK_TOP +#endif + +/* This decides where the kernel will search for a free chunk of vm + * space during mmap's. + */ +#ifdef CONFIG_MMU +#if defined(CONFIG_COLDFIRE) +#define TASK_UNMAPPED_BASE 0x60000000UL +#elif defined(CONFIG_SUN3) +#define TASK_UNMAPPED_BASE 0x0A000000UL +#else +#define TASK_UNMAPPED_BASE 0xC0000000UL +#endif +#define TASK_UNMAPPED_ALIGN(addr, off) PAGE_ALIGN(addr) +#else +#define TASK_UNMAPPED_BASE 0 +#endif + +struct thread_struct { + unsigned long ksp; /* kernel stack pointer */ + unsigned long usp; /* user stack pointer */ + unsigned short sr; /* saved status register */ + unsigned short fs; /* saved fs (sfc, dfc) */ + unsigned long crp[2]; /* cpu root pointer */ + unsigned long esp0; /* points to SR of stack frame */ + unsigned long faddr; /* info about last fault */ + int signo, code; + unsigned long fp[8*3]; + unsigned long fpcntl[3]; /* fp control regs */ + unsigned char fpstate[FPSTATESIZE]; /* floating point state */ +}; + +#define INIT_THREAD { \ + .ksp = sizeof(init_stack) + (unsigned long) init_stack, \ + .sr = PS_S, \ + .fs = __KERNEL_DS, \ +} + +/* + * ColdFire stack format sbould be 0x4 for an aligned usp (will always be + * true on thread creation). We need to set this explicitly. + */ +#ifdef CONFIG_COLDFIRE +#define setframeformat(_regs) do { (_regs)->format = 0x4; } while(0) +#else +#define setframeformat(_regs) do { } while (0) +#endif + +#ifdef CONFIG_MMU +/* + * Do necessary setup to start up a newly executed thread. + */ +static inline void start_thread(struct pt_regs * regs, unsigned long pc, + unsigned long usp) +{ + regs->pc = pc; + regs->sr &= ~0x2000; + setframeformat(regs); + wrusp(usp); +} + +extern int handle_kernel_fault(struct pt_regs *regs); + +#else + +#define start_thread(_regs, _pc, _usp) \ +do { \ + (_regs)->pc = (_pc); \ + setframeformat(_regs); \ + if (current->mm) \ + (_regs)->d5 = current->mm->start_data; \ + (_regs)->sr &= ~0x2000; \ + wrusp(_usp); \ +} while(0) + +static inline int handle_kernel_fault(struct pt_regs *regs) +{ + /* Any fault in kernel is fatal on non-mmu */ + return 0; +} + +#endif + +/* Forward declaration, a strange C thing */ +struct task_struct; + +/* Free all resources held by a thread. */ +static inline void release_thread(struct task_struct *dead_task) +{ +} + +/* + * Free current thread data structures etc.. + */ +static inline void exit_thread(void) +{ +} + +extern unsigned long thread_saved_pc(struct task_struct *tsk); + +unsigned long get_wchan(struct task_struct *p); + +#define KSTK_EIP(tsk) \ + ({ \ + unsigned long eip = 0; \ + if ((tsk)->thread.esp0 > PAGE_SIZE && \ + (virt_addr_valid((tsk)->thread.esp0))) \ + eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \ + eip; }) +#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) + +#define task_pt_regs(tsk) ((struct pt_regs *) ((tsk)->thread.esp0)) + +#define cpu_relax() barrier() +#define cpu_relax_lowlatency() cpu_relax() + +#endif |