This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / asm-powerpc / paca.h

diff --git a/include/asm-powerpc/paca.h b/include/asm-powerpc/paca.h
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+/*
+ * include/asm-powerpc/paca.h
+ *
+ * This control block defines the PACA which defines the processor
+ * specific data for each logical processor on the system.
+ * There are some pointers defined that are utilized by PLIC.
+ *
+ * C 2001 PPC 64 Team, IBM Corp
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#ifndef _ASM_POWERPC_PACA_H
+#define _ASM_POWERPC_PACA_H
+#ifdef __KERNEL__
+
+#include       <linux/config.h>
+#include       <asm/types.h>
+#include       <asm/lppaca.h>
+#include       <asm/mmu.h>
+
+register struct paca_struct *local_paca asm("r13");
+#define get_paca()     local_paca
+#define get_lppaca()   (get_paca()->lppaca_ptr)
+
+struct task_struct;
+
+/*
+ * Defines the layout of the paca.
+ *
+ * This structure is not directly accessed by firmware or the service
+ * processor except for the first two pointers that point to the
+ * lppaca area and the ItLpRegSave area for this CPU.  The lppaca
+ * object is currently contained within the PACA but it doesn't need
+ * to be.
+ */
+struct paca_struct {
+       /*
+        * Because hw_cpu_id, unlike other paca fields, is accessed
+        * routinely from other CPUs (from the IRQ code), we stick to
+        * read-only (after boot) fields in the first cacheline to
+        * avoid cacheline bouncing.
+        */
+
+       /*
+        * MAGIC: These first two pointers can't be moved - they're
+        * accessed by the firmware
+        */
+       struct lppaca *lppaca_ptr;      /* Pointer to LpPaca for PLIC */
+#ifdef CONFIG_PPC_ISERIES
+       void *reg_save_ptr; /* Pointer to LpRegSave for PLIC */
+#endif /* CONFIG_PPC_ISERIES */
+
+       /*
+        * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c 
+        * load lock_token and paca_index with a single lwz
+        * instruction.  They must travel together and be properly
+        * aligned.
+        */
+       u16 lock_token;                 /* Constant 0x8000, used in locks */
+       u16 paca_index;                 /* Logical processor number */
+
+       u64 kernel_toc;                 /* Kernel TOC address */
+       u64 stab_real;                  /* Absolute address of segment table */
+       u64 stab_addr;                  /* Virtual address of segment table */
+       void *emergency_sp;             /* pointer to emergency stack */
+       u64 data_offset;                /* per cpu data offset */
+       s16 hw_cpu_id;                  /* Physical processor number */
+       u8 cpu_start;                   /* At startup, processor spins until */
+                                       /* this becomes non-zero. */
+
+       /*
+        * Now, starting in cacheline 2, the exception save areas
+        */
+       /* used for most interrupts/exceptions */
+       u64 exgen[10] __attribute__((aligned(0x80)));
+       u64 exmc[10];           /* used for machine checks */
+       u64 exslb[10];          /* used for SLB/segment table misses
+                                * on the linear mapping */
+#ifdef CONFIG_PPC_64K_PAGES
+       pgd_t *pgdir;
+#endif /* CONFIG_PPC_64K_PAGES */
+
+       mm_context_t context;
+       u16 slb_cache[SLB_CACHE_ENTRIES];
+       u16 slb_cache_ptr;
+
+       /*
+        * then miscellaneous read-write fields
+        */
+       struct task_struct *__current;  /* Pointer to current */
+       u64 kstack;                     /* Saved Kernel stack addr */
+       u64 stab_rr;                    /* stab/slb round-robin counter */
+       u64 saved_r1;                   /* r1 save for RTAS calls */
+       u64 saved_msr;                  /* MSR saved here by enter_rtas */
+       u8 proc_enabled;                /* irq soft-enable flag */
+
+       /* Stuff for accurate time accounting */
+       u64 user_time;                  /* accumulated usermode TB ticks */
+       u64 system_time;                /* accumulated system TB ticks */
+       u64 startpurr;                  /* PURR/TB value snapshot */
+};
+
+extern struct paca_struct paca[];
+
+void setup_boot_paca(void);
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_POWERPC_PACA_H */