diff options
Diffstat (limited to 'arch/m68k/include/asm/processor.h')
| -rw-r--r-- | arch/m68k/include/asm/processor.h | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/processor.h b/arch/m68k/include/asm/processor.h new file mode 100644 index 000000000..7a2da7808 --- /dev/null +++ b/arch/m68k/include/asm/processor.h @@ -0,0 +1,164 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * include/asm-m68k/processor.h + * + * Copyright (C) 1995 Hamish Macdonald + */ + +#ifndef __ASM_M68K_PROCESSOR_H +#define __ASM_M68K_PROCESSOR_H + +#include <linux/thread_info.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 + +/* Address spaces (or Function Codes in Motorola lingo) */ +#define USER_DATA 1 +#define USER_PROGRAM 2 +#define SUPER_DATA 5 +#define SUPER_PROGRAM 6 +#define CPU_SPACE 7 + +#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES +/* + * Set the SFC/DFC registers for special MM operations. For most normal + * operation these remain set to USER_DATA for the uaccess routines. + */ +static inline void set_fc(unsigned long val) +{ + WARN_ON_ONCE(in_interrupt()); + + __asm__ __volatile__ ("movec %0,%/sfc\n\t" + "movec %0,%/dfc\n\t" + : /* no outputs */ : "r" (val) : "memory"); +} +#else +static inline void set_fc(unsigned long val) +{ +} +#endif /* CONFIG_CPU_HAS_ADDRESS_SPACES */ + +struct thread_struct { + unsigned long ksp; /* kernel stack pointer */ + unsigned long usp; /* user stack pointer */ + unsigned short sr; /* saved status register */ + unsigned short fc; /* saved fc (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, \ + .fc = USER_DATA, \ +} + +/* + * 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 + +/* + * 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); +} + +/* Forward declaration, a strange C thing */ +struct task_struct; + +unsigned long __get_wchan(struct task_struct *p); +void show_registers(struct pt_regs *regs); + +#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() + +#endif |