xnu-792.10.96.tar.gz

[apple/xnu.git] / osfmk / i386 / mp_desc.h

diff --git a/osfmk/i386/mp_desc.h b/osfmk/i386/mp_desc.h
index fd85e29adc2919430e7cbcd02017fe2f775bc5d9..c7916f1c903eb15396f53f4ea433bd6c55ad321c 100644 (file)
--- a/osfmk/i386/mp_desc.h
+++ b/osfmk/i386/mp_desc.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
@@ -54,8 +54,10 @@
 #ifndef        _I386_MP_DESC_H_
 #define        _I386_MP_DESC_H_
 
-#include <cpus.h>
 #include <mach_kdb.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
 
 /*
  * Multiprocessor i386/i486 systems use a separate copy of the
@@ -75,41 +77,114 @@
  * Note that dbtss could be conditionalized on MACH_KDB, but
  * doing so increases misconfiguration risk.
  */
-struct mp_desc_table {
-       struct fake_descriptor  idt[IDTSZ];     /* IDT */
-       struct fake_descriptor  gdt[GDTSZ];     /* GDT */
-       struct fake_descriptor  ldt[LDTSZ];     /* LDT */
-       struct i386_tss         ktss;
-       struct i386_tss         dbtss;
-};
+typedef struct cpu_desc_table {
+       struct fake_descriptor  idt[IDTSZ] __attribute__ ((aligned (16)));
+       struct fake_descriptor  gdt[GDTSZ] __attribute__ ((aligned (16)));
+       struct i386_tss         ktss       __attribute__ ((aligned (16)));
+       struct i386_tss         dbtss      __attribute__ ((aligned (16)));
+       struct sysenter_stack   sstk;
+} cpu_desc_table_t;
 
-/*
- * They are pointed to by a per-processor array.
- */
-extern struct mp_desc_table    *mp_desc_table[NCPUS];
+typedef struct cpu_desc_table64 {
+       struct fake_descriptor64 idt[IDTSZ]      __attribute__ ((aligned (16)));
+       struct fake_descriptor  gdt[GDTSZ]       __attribute__ ((aligned (16)));
+       struct x86_64_tss       ktss             __attribute__ ((aligned (16)));
+       struct sysenter_stack   sstk             __attribute__ ((aligned (16)));
+       uint8_t                 dfstk[PAGE_SIZE] __attribute__ ((aligned (16)));
+} cpu_desc_table64_t;
 
-/*
- * The kernel TSS gets its own pointer.
- */
-extern struct i386_tss         *mp_ktss[NCPUS];
-#if    MACH_KDB
-extern struct i386_tss         *mp_dbtss[NCPUS];
-#endif /* MACH_KDB */
+#define        current_gdt()   (current_cpu_datap()->cpu_desc_index.cdi_gdt)
+#define        current_idt()   (current_cpu_datap()->cpu_desc_index.cdi_idt)
+#define        current_ldt()   (current_cpu_datap()->cpu_desc_index.cdi_ldt)
+#define        current_ktss()  (current_cpu_datap()->cpu_desc_index.cdi_ktss)
+#define        current_dbtss() (current_cpu_datap()->cpu_desc_index.cdi_dbtss)
+#define        current_sstk()  (current_cpu_datap()->cpu_desc_index.cdi_sstk)
 
-/*
- * So does the GDT and IDT.
- */
-extern struct fake_descriptor  *mp_gdt[NCPUS];
-extern struct fake_descriptor  *mp_idt[NCPUS];
-extern struct fake_descriptor  *mp_ldt[NCPUS];
+#define        current_ktss64() ((struct x86_64_tss *) current_ktss())
+#define        current_sstk64() ((addr64_t *) current_sstk())
 
+#define        gdt_desc_p(sel) \
+       ((struct real_descriptor *)&current_gdt()[sel_idx(sel)])
+#define        ldt_desc_p(sel) \
+       ((struct real_descriptor *)&current_ldt()[sel_idx(sel)])
 
-/*
- * Each CPU calls this routine to set up its descriptor tables.
- */
+extern void    cpu_desc_init(
+                       cpu_data_t      *cdp,
+                       boolean_t       is_boot_cpu);
+extern void    cpu_desc_init64(
+                       cpu_data_t      *cdp,
+                       boolean_t       is_boot_cpu);
+extern void    cpu_desc_load64(
+                       cpu_data_t      *cdp);
+extern void    fast_syscall_init(void);
+extern void    fast_syscall_init64(void);
+
+static inline boolean_t
+valid_user_data_selector(uint16_t selector)
+{
+    sel_t      sel = selector_to_sel(selector);
+    
+    if (selector == 0)
+       return (TRUE);
+
+    if (sel.ti == SEL_LDT)
+       return (TRUE);
+    else if (sel.index < GDTSZ) {
+       if ((gdt_desc_p(selector)->access & ACC_PL_U) == ACC_PL_U)
+           return (TRUE);
+    }
+               
+    return (FALSE);
+}
+
+static inline boolean_t
+valid_user_code_selector(uint16_t selector)
+{
+    sel_t      sel = selector_to_sel(selector);
+    
+    if (selector == 0)
+       return (FALSE);
+
+    if (sel.ti == SEL_LDT) {
+       if (sel.rpl == USER_PRIV)
+           return (TRUE);
+    }
+    else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) {
+       if ((gdt_desc_p(selector)->access & ACC_PL_U) == ACC_PL_U)
+           return (TRUE);
+    }
+
+    return (FALSE);
+}
+
+static inline boolean_t
+valid_user_stack_selector(uint16_t selector)
+{
+    sel_t      sel = selector_to_sel(selector);
+    
+    if (selector == 0)
+       return (FALSE);
+
+    if (sel.ti == SEL_LDT) {
+       if (sel.rpl == USER_PRIV)
+           return (TRUE);
+    }
+    else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) {
+       if ((gdt_desc_p(selector)->access & ACC_PL_U) == ACC_PL_U)
+           return (TRUE);
+    }
+               
+    return (FALSE);
+}
+
+extern boolean_t
+valid_user_segment_selectors(uint16_t cs,
+                             uint16_t ss,
+                             uint16_t ds,
+                             uint16_t es,
+                             uint16_t fs,
+                             uint16_t gs);
 
-extern struct mp_desc_table *  mp_desc_init(
-                                       int             cpu);
-extern void                    interrupt_stack_alloc(void);
+__END_DECLS
 
 #endif /* _I386_MP_DESC_H_ */