mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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42a2b54ce8
Clean up the calculation and use of the usable address space size on the host. task_size is gone, replaced with TASK_SIZE, which is calculated from CONFIG_TOP_ADDR. get_kmem_end and set_task_sizes_skas are also gone. host_task_size, which refers to the entire address space usable by the UML kernel and which may be larger than the address space usable by a UML process, since that has to end on a pgdir boundary, is replaced by CONFIG_TOP_ADDR. STACK_TOP is now TASK_SIZE minus the two stub pages. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/*
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* Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#ifndef __START_H__
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#define __START_H__
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#include "uml-config.h"
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#include "kern_constants.h"
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/*
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* Stolen from linux/const.h, which can't be directly included since
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* this is used in userspace code, which has no access to the kernel
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* headers. Changed to be suitable for adding casts to the start,
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* rather than "UL" to the end.
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*/
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/* Some constant macros are used in both assembler and
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* C code. Therefore we cannot annotate them always with
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* 'UL' and other type specifiers unilaterally. We
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* use the following macros to deal with this.
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*/
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#ifdef __ASSEMBLY__
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#define _AC(X, Y) (Y)
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#else
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#define __AC(X, Y) (X (Y))
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#define _AC(X, Y) __AC(X, Y)
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#endif
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/*
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* The "- 1"'s are to avoid gcc complaining about integer overflows
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* and unrepresentable decimal constants. With 3-level page tables,
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* TASK_SIZE is 0x80000000, which gets turned into its signed decimal
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* equivalent in asm-offsets.s. gcc then complains about that being
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* unsigned only in C90. To avoid that, UM_TASK_SIZE is defined as
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* TASK_SIZE - 1. To compensate, we need to add the 1 back here.
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* However, adding it back to UM_TASK_SIZE produces more gcc
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* complaints. So, I adjust the thing being subtracted from
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* UM_TASK_SIZE instead. Bah.
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*/
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#define STUB_CODE _AC((unsigned long), \
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UM_TASK_SIZE - (2 * UM_KERN_PAGE_SIZE - 1))
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#define STUB_DATA _AC((unsigned long), UM_TASK_SIZE - (UM_KERN_PAGE_SIZE - 1))
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#define STUB_START _AC(, STUB_CODE)
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#ifndef __ASSEMBLY__
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#include "sysdep/ptrace.h"
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struct cpu_task {
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int pid;
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void *task;
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};
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extern struct cpu_task cpu_tasks[];
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extern unsigned long low_physmem;
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extern unsigned long high_physmem;
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extern unsigned long uml_physmem;
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extern unsigned long uml_reserved;
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extern unsigned long end_vm;
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extern unsigned long start_vm;
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extern unsigned long long highmem;
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extern unsigned long _stext, _etext, _sdata, _edata, __bss_start, _end;
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extern unsigned long _unprotected_end;
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extern unsigned long brk_start;
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extern int linux_main(int argc, char **argv);
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extern void (*sig_info[])(int, struct uml_pt_regs *);
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#endif
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#endif
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