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Added function read_cpu_flags() that returns current cpu flags as a

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long.  This is used to check for interrupts being disabled at the time
of a lock() call, if enabled in config.h. The number of times this
happens is then counted in the kinfo structure. These events (recursive
lockings) lead to nasty race conditions.
This commit is contained in:
Ben Gras
2005-06-20 14:53:13 +00:00
parent c60302c1e7
commit 3eeff022fb
4 changed files with 23 additions and 1 deletions
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9
kernel/const.h
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@@ -3,6 +3,7 @@
#include <ibm/interrupt.h> /* interrupt numbers and hardware vectors */
#include <ibm/ports.h> /* port addresses and magic numbers */
#include <ibm/bios.h> /* BIOS addresses, sizes and magic numbers */
#include <ibm/cpu.h> /* BIOS addresses, sizes and magic numbers */
#include <minix/config.h>
/* To translate an address in kernel space to a physical address. This is
@@ -73,8 +74,14 @@
#define locktimeend(c)
#endif
#if ENABLE_K_LOCKCHECK
#define lockcheck if(!(read_cpu_flags() & X86_FLAG_I)) kinfo.relocking++;
#else
#define lockcheck
#endif
/* Disable/Enable hardware interrupts. */
#define lock(c, v) do { intr_disable(); locktimestart(c, v); } while(0)
#define lock(c, v) do { lockcheck; intr_disable(); locktimestart(c, v); } while(0)
#define unlock(c) do { locktimeend(c); intr_enable(); } while(0)
/* Sizes of memory tables. The boot monitor distinguishes three memory areas,