* We now support the global page feature of x86 processors that prevents

kernel TLBs from being flushed on context switch.
* new arch_cpu_user_TLB_invalidate() that now does what arch_cpu_global_TLB_invalidate()
  did before.
* arch_cpu_global_TLB_invalidate() will now flush all TLBs, even those from the
  kernel.
* some cleanups.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15535 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/arch/cpu.h

@@ -27,11 +27,15 @@ status_t arch_cpu_shutdown(bool reboot);
 
 void arch_cpu_invalidate_TLB_range(addr_t start, addr_t end);
 void arch_cpu_invalidate_TLB_list(addr_t pages[], int num_pages);
+void arch_cpu_user_TLB_invalidate(void);
 void arch_cpu_global_TLB_invalidate(void);
 
-status_t arch_cpu_user_memcpy(void *to, const void *from, size_t size, addr_t *faultHandler);
-ssize_t arch_cpu_user_strlcpy(char *to, const char *from, size_t size, addr_t *faultHandler);
-status_t arch_cpu_user_memset(void *s, char c, size_t count, addr_t *faultHandler);
+status_t arch_cpu_user_memcpy(void *to, const void *from, size_t size,
+			addr_t *faultHandler);
+ssize_t arch_cpu_user_strlcpy(char *to, const char *from, size_t size,
+			addr_t *faultHandler);
+status_t arch_cpu_user_memset(void *s, char c, size_t count,
+			addr_t *faultHandler);
 
 void arch_cpu_idle(void);
 void arch_cpu_sync_icache(void *address, size_t length);

headers/private/kernel/arch/x86/arch_cpu.h

@@ -21,6 +21,9 @@
 #define IA32_MSR_MTRR_PHYSICAL_BASE_0	0x200
 #define IA32_MSR_MTRR_PHYSICAL_MASK_0	0x201
 
+// cr4 flags
+#define IA32_CR4_GLOBAL_PAGES		(1UL << 7)
+
 // Memory type ranges
 #define IA32_MTR_UNCACHED			0
 #define IA32_MTR_WRITE_COMBINED		1
@@ -104,6 +107,8 @@ void i386_fxsave_swap(void *old_fpu_state, const void *new_fpu_state);
 uint32 x86_read_ebp();
 uint32 x86_read_cr0();
 void x86_write_cr0(uint32 value);
+uint32 x86_read_cr4();
+void x86_write_cr4(uint32 value);
 uint64 x86_read_msr(uint32 registerNumber);
 void x86_write_msr(uint32 registerNumber, uint64 value);
 void x86_set_task_gate(int32 n, int32 segment);