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SMP - Cpu local variables

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- most global variables carry information which is specific to the
  local CPU and each CPU must have its own copy

- cpu local variable must be declared in cpulocal.h between
  DECLARE_CPULOCAL_START and DECLARE_CPULOCAL_END markers using
  DECLARE_CPULOCAL macro

- to access the cpu local data the provided macros must be used

	get_cpu_var(cpu, name)
	get_cpu_var_ptr(cpu, name)

	get_cpulocal_var(name)
	get_cpulocal_var_ptr(name)

- using this macros makes future changes in the implementation
  possible

- switching to ELF will make the declaration of cpu local data much
  simpler, e.g.

  CPULOCAL int blah;

  anywhere in the kernel source code
This commit is contained in:
Tomas Hruby
2010-09-15 14:09:46 +00:00
parent 2a2a19e542
commit 13a0d5fa5e
17 changed files with 208 additions and 102 deletions
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6
kernel/system/do_update.c
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@@ -76,7 +76,7 @@ PUBLIC int do_update(struct proc * caller, message * m_ptr)
proc_stacktrace(src_rp);
proc_stacktrace(dst_rp);
printf("do_update: curr ptproc %d\n", ptproc->p_endpoint);
printf("do_update: curr ptproc %d\n", get_cpulocal_var(ptproc)->p_endpoint);
#endif
/* Let destination inherit the target mask from source. */
@@ -107,7 +107,7 @@ PUBLIC int do_update(struct proc * caller, message * m_ptr)
adjust_priv_slot(priv(dst_rp), &orig_dst_priv);
/* Swap global process slot addresses. */
swap_proc_slot_pointer(&ptproc, src_rp, dst_rp);
swap_proc_slot_pointer(get_cpulocal_var_ptr(ptproc), src_rp, dst_rp);
/* Fix segments. */
alloc_segments(src_rp);
@@ -121,7 +121,7 @@ PUBLIC int do_update(struct proc * caller, message * m_ptr)
proc_stacktrace(src_rp);
proc_stacktrace(dst_rp);
printf("do_update: curr ptproc %d\n", ptproc->p_endpoint);
printf("do_update: curr ptproc %d\n", get_cpulocal_var(ptproc)->p_endpoint);
#endif
return OK;