#ifndef _PPC64_PACA_H
#define _PPC64_PACA_H
-/*============================================================================
- * Header File Id
- * Name______________: paca.h
- *
- * Description_______:
+/*
+ * include/asm-ppc64/paca.h
*
* This control block defines the PACA which defines the processor
* specific data for each logical processor on the system.
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
-#include <asm/types.h>
-#define N_EXC_STACK 2
-
-/*-----------------------------------------------------------------------------
- * Other Includes
- *-----------------------------------------------------------------------------
- */
+#include <asm/types.h>
#include <asm/iSeries/ItLpPaca.h>
#include <asm/iSeries/ItLpRegSave.h>
-#include <asm/iSeries/ItLpQueue.h>
-#include <asm/rtas.h>
#include <asm/mmu.h>
-#include <asm/processor.h>
extern struct paca_struct paca[];
register struct paca_struct *local_paca asm("r13");
#define get_paca() local_paca
struct task_struct;
+struct ItLpQueue;
-/*============================================================================
- * Name_______: paca
- *
- * Description:
- *
- * Defines the layout of the paca.
+/*
+ * Defines the layout of the paca.
*
- * This structure is not directly accessed by PLIC or the SP except
- * for the first two pointers that point to the ItLpPaca area and the
- * ItLpRegSave area for this processor. Both the ItLpPaca and
- * ItLpRegSave objects are currently contained within the
- * PACA but they do not need to be.
- *
- *============================================================================
+ * This structure is not directly accessed by firmware or the service
+ * processor except for the first two pointers that point to the
+ * ItLpPaca area and the ItLpRegSave area for this CPU. Both the
+ * ItLpPaca and ItLpRegSave objects are currently contained within the
+ * PACA but they do not need to be.
*/
struct paca_struct {
-/*=====================================================================================
- * CACHE_LINE_1 0x0000 - 0x007F
- *=====================================================================================
- */
- struct ItLpPaca *xLpPacaPtr; /* Pointer to LpPaca for PLIC 0x00 */
- struct ItLpRegSave *xLpRegSavePtr; /* Pointer to LpRegSave for PLIC 0x08 */
- struct task_struct *xCurrent; /* Pointer to current 0x10 */
- /* Note: the spinlock functions in arch/ppc64/lib/locks.c load lock_token and
- xPacaIndex with a single lwz instruction, using the constant offset 24.
- If you move either field, fix the spinlocks and rwlocks. */
- u16 lock_token; /* Constant 0x8000, used in spinlocks 0x18 */
- u16 xPacaIndex; /* Logical processor number 0x1A */
- u32 default_decr; /* Default decrementer value 0x1c */
- u64 xKsave; /* Saved Kernel stack addr or zero 0x20 */
- struct ItLpQueue *lpQueuePtr; /* LpQueue handled by this processor 0x28 */
- u64 xTOC; /* Kernel TOC address 0x30 */
- STAB xStab_data; /* Segment table information 0x38,0x40,0x48 */
- u8 *exception_sp; /* 0x50 */
- u8 xProcEnabled; /* 0x58 */
- u8 prof_enabled; /* 1=iSeries profiling enabled 0x59 */
- u16 xHwProcNum; /* Physical processor number 0x5a */
- u8 resv1[36]; /* 0x5c */
-
-/*=====================================================================================
- * CACHE_LINE_2 0x0080 - 0x00FF
- *=====================================================================================
- */
- u64 spare1; /* 0x00 */
- u64 spare2; /* 0x08 */
- u64 spare3; /* 0x10 */
- u64 spare4; /* 0x18 */
- u64 next_jiffy_update_tb; /* TB value for next jiffy update 0x20 */
- u32 lpEvent_count; /* lpEvents processed 0x28 */
- u32 prof_multiplier; /* 0x2C */
- u32 prof_counter; /* 0x30 */
- u32 prof_shift; /* iSeries shift for profile bucket size0x34 */
- u32 *prof_buffer; /* iSeries profiling buffer 0x38 */
- u32 *prof_stext; /* iSeries start of kernel text 0x40 */
- u32 prof_len; /* iSeries length of profile buffer -1 0x48 */
- u8 yielded; /* 0 = this processor is running 0x4c */
- /* 1 = this processor is yielded */
- u8 rsvd2[128-77]; /* 0x49 */
-
-/*=====================================================================================
- * CACHE_LINE_3 0x0100 - 0x017F
- *=====================================================================================
- */
- u8 xProcStart; /* At startup, processor spins until 0x100 */
- /* xProcStart becomes non-zero. */
- u8 rsvd3[127];
-
-/*=====================================================================================
- * CACHE_LINE_4-8 0x0180 - 0x03FF Contains ItLpPaca
- *=====================================================================================
- */
- struct ItLpPaca xLpPaca; /* Space for ItLpPaca */
-
-/*=====================================================================================
- * CACHE_LINE_9-16 0x0400 - 0x07FF Contains ItLpRegSave
- *=====================================================================================
- */
- struct ItLpRegSave xRegSav; /* Register save for proc */
-
-/*=====================================================================================
- * CACHE_LINE_17-18 0x0800 - 0x08FF Reserved
- *=====================================================================================
- */
- struct rtas_args xRtas; /* Per processor RTAS struct */
- u64 xR1; /* r1 save for RTAS calls */
- u64 xSavedMsr; /* Old msr saved here by HvCall */
- u8 rsvd5[256-16-sizeof(struct rtas_args)];
-
-/*=====================================================================================
- * CACHE_LINE_19-30 0x0900 - 0x0EFF Reserved
- *=====================================================================================
- */
- u64 slb_shadow[0x20];
- u64 dispatch_log;
- u8 rsvd6[0x500 - 0x8];
-
-/*=====================================================================================
- * CACHE_LINE_31 0x0F00 - 0x0F7F Exception stack
- *=====================================================================================
- */
- u8 exception_stack[N_EXC_STACK*EXC_FRAME_SIZE];
-
-/*=====================================================================================
- * CACHE_LINE_32 0x0F80 - 0x0FFF Reserved
- *=====================================================================================
- */
- u8 rsvd7[0x80]; /* Give the stack some rope ... */
-
-/*=====================================================================================
- * Page 2 Reserved for guard page. Also used as a stack early in SMP boots before
- * relocation is enabled.
- *=====================================================================================
- */
- u8 guard[0x1000]; /* ... and then hang 'em */
+ /*
+ * 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 ItLpPaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */
+ struct ItLpRegSave *reg_save_ptr; /* Pointer to LpRegSave for PLIC */
+
+ /*
+ * MAGIC: the spinlock functions in arch/ppc64/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 */
+
+ u32 default_decr; /* Default decrementer value */
+ struct ItLpQueue *lpqueue_ptr; /* LpQueue handled by this CPU */
+ 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 */
+ u16 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
+ */
+ u64 exgen[8] __attribute__((aligned(0x80))); /* used for most interrupts/exceptions */
+ u64 exmc[8]; /* used for machine checks */
+ u64 exslb[8]; /* used for SLB/segment table misses
+ * on the linear mapping */
+ u64 slb_r3; /* spot to save R3 on SLB miss */
+ 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 next_jiffy_update_tb; /* TB value for next jiffy update */
+ u64 saved_r1; /* r1 save for RTAS calls */
+ u64 saved_msr; /* MSR saved here by enter_rtas */
+ u32 lpevent_count; /* lpevents processed */
+ u8 proc_enabled; /* irq soft-enable flag */
+
+ /* not yet used */
+ u64 exdsi[8]; /* used for linear mapping hash table misses */
+
+ /*
+ * iSeries structues which the hypervisor knows about - Not
+ * sure if these particularly need to be cacheline aligned.
+ * The lppaca is also used on POWER5 pSeries boxes.
+ */
+ struct ItLpPaca lppaca __attribute__((aligned(0x80)));
+ struct ItLpRegSave reg_save;
+
+ /*
+ * iSeries profiling support
+ *
+ * FIXME: do we still want this, or can we ditch it in favour
+ * of oprofile?
+ */
+ u32 *prof_buffer; /* iSeries profiling buffer */
+ u32 *prof_stext; /* iSeries start of kernel text */
+ u32 prof_multiplier;
+ u32 prof_counter;
+ u32 prof_shift; /* iSeries shift for profile
+ * bucket size */
+ u32 prof_len; /* iSeries length of profile */
+ u8 prof_enabled; /* 1=iSeries profiling enabled */
};
#endif /* _PPC64_PACA_H */
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