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1/*
2 * lppaca.h
3 * Copyright (C) 2001 Mike Corrigan IBM Corporation
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19#ifndef _ASM_POWERPC_LPPACA_H
20#define _ASM_POWERPC_LPPACA_H
21#ifdef __KERNEL__
22
23//=============================================================================
24//
25// This control block contains the data that is shared between the
26// hypervisor (PLIC) and the OS.
27//
28//
29//----------------------------------------------------------------------------
30#include <linux/cache.h>
31#include <asm/types.h>
32#include <asm/mmu.h>
33
34/* The Hypervisor barfs if the lppaca crosses a page boundary. A 1k
35 * alignment is sufficient to prevent this */
36struct lppaca {
37//=============================================================================
38// CACHE_LINE_1 0x0000 - 0x007F Contains read-only data
39// NOTE: The xDynXyz fields are fields that will be dynamically changed by
40// PLIC when preparing to bring a processor online or when dispatching a
41// virtual processor!
42//=============================================================================
43 u32 desc; // Eye catcher 0xD397D781 x00-x03
44 u16 size; // Size of this struct x04-x05
45 u16 reserved1; // Reserved x06-x07
46 u16 reserved2:14; // Reserved x08-x09
47 u8 shared_proc:1; // Shared processor indicator ...
48 u8 secondary_thread:1; // Secondary thread indicator ...
49 volatile u8 dyn_proc_status:8; // Dynamic Status of this proc x0A-x0A
50 u8 secondary_thread_count; // Secondary thread count x0B-x0B
51 volatile u16 dyn_hv_phys_proc_index;// Dynamic HV Physical Proc Index0C-x0D
52 volatile u16 dyn_hv_log_proc_index;// Dynamic HV Logical Proc Indexx0E-x0F
53 u32 decr_val; // Value for Decr programming x10-x13
54 u32 pmc_val; // Value for PMC regs x14-x17
55 volatile u32 dyn_hw_node_id; // Dynamic Hardware Node id x18-x1B
56 volatile u32 dyn_hw_proc_id; // Dynamic Hardware Proc Id x1C-x1F
57 volatile u32 dyn_pir; // Dynamic ProcIdReg value x20-x23
58 u32 dsei_data; // DSEI data x24-x27
59 u64 sprg3; // SPRG3 value x28-x2F
60 u8 reserved3[80]; // Reserved x30-x7F
61
62//=============================================================================
63// CACHE_LINE_2 0x0080 - 0x00FF Contains local read-write data
64//=============================================================================
65 // This Dword contains a byte for each type of interrupt that can occur.
66 // The IPI is a count while the others are just a binary 1 or 0.
67 union {
68 u64 any_int;
69 struct {
70 u16 reserved; // Reserved - cleared by #mpasmbl
71 u8 xirr_int; // Indicates xXirrValue is valid or Immed IO
72 u8 ipi_cnt; // IPI Count
73 u8 decr_int; // DECR interrupt occurred
74 u8 pdc_int; // PDC interrupt occurred
75 u8 quantum_int; // Interrupt quantum reached
76 u8 old_plic_deferred_ext_int; // Old PLIC has a deferred XIRR pending
77 } fields;
78 } int_dword;
79
80 // Whenever any fields in this Dword are set then PLIC will defer the
81 // processing of external interrupts. Note that PLIC will store the
82 // XIRR directly into the xXirrValue field so that another XIRR will
83 // not be presented until this one clears. The layout of the low
84 // 4-bytes of this Dword is upto SLIC - PLIC just checks whether the
85 // entire Dword is zero or not. A non-zero value in the low order
86 // 2-bytes will result in SLIC being granted the highest thread
87 // priority upon return. A 0 will return to SLIC as medium priority.
88 u64 plic_defer_ints_area; // Entire Dword
89
90 // Used to pass the real SRR0/1 from PLIC to SLIC as well as to
91 // pass the target SRR0/1 from SLIC to PLIC on a SetAsrAndRfid.
92 u64 saved_srr0; // Saved SRR0 x10-x17
93 u64 saved_srr1; // Saved SRR1 x18-x1F
94
95 // Used to pass parms from the OS to PLIC for SetAsrAndRfid
96 u64 saved_gpr3; // Saved GPR3 x20-x27
97 u64 saved_gpr4; // Saved GPR4 x28-x2F
98 u64 saved_gpr5; // Saved GPR5 x30-x37
99
100 u8 reserved4; // Reserved x38-x38
101 u8 donate_dedicated_cpu; // Donate dedicated CPU cycles x39-x39
102 u8 fpregs_in_use; // FP regs in use x3A-x3A
103 u8 pmcregs_in_use; // PMC regs in use x3B-x3B
104 volatile u32 saved_decr; // Saved Decr Value x3C-x3F
105 volatile u64 emulated_time_base;// Emulated TB for this thread x40-x47
106 volatile u64 cur_plic_latency; // Unaccounted PLIC latency x48-x4F
107 u64 tot_plic_latency; // Accumulated PLIC latency x50-x57
108 u64 wait_state_cycles; // Wait cycles for this proc x58-x5F
109 u64 end_of_quantum; // TB at end of quantum x60-x67
110 u64 pdc_saved_sprg1; // Saved SPRG1 for PMC int x68-x6F
111 u64 pdc_saved_srr0; // Saved SRR0 for PMC int x70-x77
112 volatile u32 virtual_decr; // Virtual DECR for shared procsx78-x7B
113 u16 slb_count; // # of SLBs to maintain x7C-x7D
114 u8 idle; // Indicate OS is idle x7E
115 u8 vmxregs_in_use; // VMX registers in use x7F
116
117
118//=============================================================================
119// CACHE_LINE_3 0x0100 - 0x017F: This line is shared with other processors
120//=============================================================================
121 // This is the yield_count. An "odd" value (low bit on) means that
122 // the processor is yielded (either because of an OS yield or a PLIC
123 // preempt). An even value implies that the processor is currently
124 // executing.
125 // NOTE: This value will ALWAYS be zero for dedicated processors and
126 // will NEVER be zero for shared processors (ie, initialized to a 1).
127 volatile u32 yield_count; // PLIC increments each dispatchx00-x03
128 u32 reserved6;
129 volatile u64 cmo_faults; // CMO page fault count x08-x0F
130 volatile u64 cmo_fault_time; // CMO page fault time x10-x17
131 u8 reserved7[104]; // Reserved x18-x7F
132
133//=============================================================================
134// CACHE_LINE_4-5 0x0180 - 0x027F Contains PMC interrupt data
135//=============================================================================
136 u8 pmc_save_area[256]; // PMC interrupt Area x00-xFF
137} __attribute__((__aligned__(0x400)));
138
139extern struct lppaca lppaca[];
140
141/*
142 * SLB shadow buffer structure as defined in the PAPR. The save_area
143 * contains adjacent ESID and VSID pairs for each shadowed SLB. The
144 * ESID is stored in the lower 64bits, then the VSID.
145 */
146struct slb_shadow {
147 u32 persistent; // Number of persistent SLBs x00-x03
148 u32 buffer_length; // Total shadow buffer length x04-x07
149 u64 reserved; // Alignment x08-x0f
150 struct {
151 u64 esid;
152 u64 vsid;
153 } save_area[SLB_NUM_BOLTED]; // x10-x40
154} ____cacheline_aligned;
155
156extern struct slb_shadow slb_shadow[];
157
158#endif /* __KERNEL__ */
159#endif /* _ASM_POWERPC_LPPACA_H */
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