/*
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/*
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* include/asm-m68k/processor.h
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* include/asm-m68k/processor.h
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*
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*
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* Copyright (C) 1995 Hamish Macdonald
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* Copyright (C) 1995 Hamish Macdonald
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*/
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*/
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#ifndef __ASM_M68K_PROCESSOR_H
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#ifndef __ASM_M68K_PROCESSOR_H
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#define __ASM_M68K_PROCESSOR_H
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#define __ASM_M68K_PROCESSOR_H
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#include <asm/segment.h>
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#include <asm/segment.h>
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/*
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/*
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* User space process size: 3.75GB. This is hardcoded into a few places,
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* User space process size: 3.75GB. This is hardcoded into a few places,
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* so don't change it unless you know what you are doing.
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* so don't change it unless you know what you are doing.
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*/
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*/
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#define TASK_SIZE (0xF0000000UL)
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#define TASK_SIZE (0xF0000000UL)
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#define MAX_USER_ADDR TASK_SIZE
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#define MAX_USER_ADDR TASK_SIZE
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#define MMAP_SEARCH_START (TASK_SIZE/3)
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#define MMAP_SEARCH_START (TASK_SIZE/3)
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/*
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/*
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* Bus types
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* Bus types
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*/
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*/
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#define EISA_bus__is_a_macro 1
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#define EISA_bus__is_a_macro 1
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#define EISA_bus 0
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#define EISA_bus 0
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#define MCA_bus__is_a_macro 1
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#define MCA_bus__is_a_macro 1
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#define MCA_bus 0
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#define MCA_bus 0
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/*
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/*
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* The m68k has no problems with write protection
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* The m68k has no problems with write protection
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*/
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*/
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#define wp_works_ok__is_a_macro 1
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#define wp_works_ok__is_a_macro 1
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#define wp_works_ok 1
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#define wp_works_ok 1
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/* MAX floating point unit state size (FSAVE/FRESTORE) */
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/* MAX floating point unit state size (FSAVE/FRESTORE) */
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#define FPSTATESIZE (216/sizeof(unsigned short))
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#define FPSTATESIZE (216/sizeof(unsigned short))
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/*
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/*
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* if you change this structure, you must change the code and offsets
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* if you change this structure, you must change the code and offsets
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* in m68k/machasm.S
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* in m68k/machasm.S
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*/
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*/
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struct thread_struct {
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struct thread_struct {
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unsigned long ksp; /* kernel stack pointer */
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unsigned long ksp; /* kernel stack pointer */
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unsigned long usp; /* user stack pointer */
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unsigned long usp; /* user stack pointer */
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unsigned short sr; /* saved status register */
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unsigned short sr; /* saved status register */
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unsigned short fs; /* saved fs (sfc, dfc) */
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unsigned short fs; /* saved fs (sfc, dfc) */
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unsigned long *pagedir_v; /* root page table virtual addr */
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unsigned long *pagedir_v; /* root page table virtual addr */
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unsigned long pagedir_p; /* root page table physaddr */
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unsigned long pagedir_p; /* root page table physaddr */
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unsigned long crp[2]; /* cpu root pointer */
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unsigned long crp[2]; /* cpu root pointer */
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unsigned long esp0; /* points to SR of stack frame */
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unsigned long esp0; /* points to SR of stack frame */
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unsigned long fp[8*3];
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unsigned long fp[8*3];
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unsigned long fpcntl[3]; /* fp control regs */
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unsigned long fpcntl[3]; /* fp control regs */
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unsigned short fpstate[FPSTATESIZE]; /* floating point state */
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unsigned short fpstate[FPSTATESIZE]; /* floating point state */
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};
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};
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#define INIT_MMAP { &init_mm, 0, 0x40000000, __pgprot(_PAGE_PRESENT|_PAGE_ACCESSED), VM_READ | VM_WRITE | VM_EXEC }
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#define INIT_MMAP { &init_mm, 0, 0x40000000, __pgprot(_PAGE_PRESENT|_PAGE_ACCESSED), VM_READ | VM_WRITE | VM_EXEC }
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#define INIT_TSS { \
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#define INIT_TSS { \
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sizeof(init_kernel_stack) + (long) init_kernel_stack, 0, \
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sizeof(init_kernel_stack) + (long) init_kernel_stack, 0, \
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PS_S, KERNEL_DS, \
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PS_S, KERNEL_DS, \
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NULL, 0, {0, 0}, 0 \
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NULL, 0, {0, 0}, 0 \
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}
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}
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#define alloc_kernel_stack() get_free_page(GFP_KERNEL)
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#define alloc_kernel_stack() get_free_page(GFP_KERNEL)
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#define free_kernel_stack(page) free_page((page))
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#define free_kernel_stack(page) free_page((page))
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/*
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/*
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* Do necessary setup to start up a newly executed thread.
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* Do necessary setup to start up a newly executed thread.
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*/
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*/
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static inline void start_thread(struct pt_regs * regs, unsigned long pc,
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static inline void start_thread(struct pt_regs * regs, unsigned long pc,
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unsigned long usp)
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unsigned long usp)
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{
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{
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unsigned long nilstate = 0;
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unsigned long nilstate = 0;
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/* clear floating point state */
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/* clear floating point state */
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__asm__ __volatile__ ("frestore %0@" : : "a" (&nilstate));
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__asm__ __volatile__ ("frestore %0@" : : "a" (&nilstate));
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/* reads from user space */
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/* reads from user space */
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set_fs(USER_DS);
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set_fs(USER_DS);
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regs->pc = pc;
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regs->pc = pc;
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regs->sr &= ~0x2000;
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regs->sr &= ~0x2000;
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wrusp(usp);
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wrusp(usp);
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}
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}
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/*
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/*
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* Return saved PC of a blocked thread.
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* Return saved PC of a blocked thread.
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*/
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*/
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extern inline unsigned long thread_saved_pc(struct thread_struct *t)
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extern inline unsigned long thread_saved_pc(struct thread_struct *t)
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{
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{
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return ((unsigned long *)((struct switch_stack *)t->ksp)->a6)[1];
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return ((unsigned long *)((struct switch_stack *)t->ksp)->a6)[1];
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}
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}
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#endif
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#endif
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