patch-1.3.94 linux/include/asm-m68k/processor.h

• Lines: 93
• Date: Sun Mar 24 12:21:16 1996
• Orig file: v1.3.93/linux/include/asm-m68k/processor.h
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.93/linux/include/asm-m68k/processor.h linux/include/asm-m68k/processor.h
@@ -0,0 +1,92 @@
+/*
+ * include/asm-m68k/processor.h
+ *
+ * Copyright (C) 1995 Hamish Macdonald
+ */
+
+#ifndef __ASM_M68K_PROCESSOR_H
+#define __ASM_M68K_PROCESSOR_H
+
+#include <asm/segment.h>
+
+/*
+ * 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.
+ */
+#define TASK_SIZE	(0xF0000000UL)
+
+/*
+ * Bus types
+ */
+#define EISA_bus__is_a_macro	1
+#define EISA_bus 0
+#define MCA_bus__is_a_macro	1
+#define MCA_bus 0
+
+/*
+ * The m68k has no problems with write protection
+ */
+#define wp_works_ok__is_a_macro	1
+#define wp_works_ok 1
+
+/* MAX floating point unit state size (FSAVE/FRESTORE) */
+#define FPSTATESIZE   (216/sizeof(unsigned short))
+
+/* 
+ * if you change this structure, you must change the code and offsets
+ * in m68k/machasm.S
+ */
+   
+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  *pagedir_v;	/* root page table virtual addr */
+	unsigned long  pagedir_p;	/* root page table physaddr */
+	unsigned long  crp[2];		/* cpu root pointer */
+	unsigned long  esp0;		/* points to SR of stack frame */
+	unsigned long  fp[8*3];
+	unsigned long  fpcntl[3];	/* fp control regs */
+	unsigned short fpstate[FPSTATESIZE];  /* floating point state */
+};
+
+#define INIT_MMAP { &init_mm, 0, 0x40000000, __pgprot(_PAGE_PRESENT|_PAGE_ACCESSED), VM_READ | VM_WRITE | VM_EXEC }
+
+#define INIT_TSS  { \
+	sizeof(init_kernel_stack) + (long) init_kernel_stack, 0, \
+	PS_S, KERNEL_DS, \
+	NULL, 0, {0, 0}, 0 \
+}
+
+#define alloc_kernel_stack()    get_free_page(GFP_KERNEL)
+#define free_kernel_stack(page) free_page((page))
+
+/*
+ * 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)
+{
+	unsigned long nilstate = 0;
+
+	/* clear floating point state */
+	__asm__ __volatile__ ("frestore %0@" : : "a" (&nilstate));
+
+	/* reads from user space */
+	set_fs(USER_DS);
+
+	regs->pc = pc;
+	regs->sr &= ~0x2000;
+	wrusp(usp);
+}
+
+/*
+ * Return saved PC of a blocked thread.
+ */
+extern inline unsigned long thread_saved_pc(struct thread_struct *t)
+{
+	return ((unsigned long *)((struct switch_stack *)t->ksp)->a6)[1];
+}
+
+#endif