2 * c 2001 PPC 64 Team, IBM Corp
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
10 #include <linux/threads.h>
11 #include <linux/module.h>
13 #include <asm/lppaca.h>
16 /* This symbol is provided by the linker - let it fill in the paca
18 extern unsigned long __toc_start
;
21 * The structure which the hypervisor knows about - this structure
22 * should not cross a page boundary. The vpa_init/register_vpa call
23 * is now known to fail if the lppaca structure crosses a page
24 * boundary. The lppaca is also used on legacy iSeries and POWER5
25 * pSeries boxes. The lppaca is 640 bytes long, and cannot readily
26 * change since the hypervisor knows its layout, so a 1kB alignment
27 * will suffice to ensure that it doesn't cross a page boundary.
29 struct lppaca lppaca
[] = {
30 [0 ... (NR_CPUS
-1)] = {
31 .desc
= 0xd397d781, /* "LpPa" */
32 .size
= sizeof(struct lppaca
),
34 .decr_val
= 0x00ff0000,
36 .end_of_quantum
= 0xfffffffffffffffful
,
43 * 3 persistent SLBs are registered here. The buffer will be zero
44 * initially, hence will all be invaild until we actually write them.
46 struct slb_shadow slb_shadow
[] __cacheline_aligned
= {
47 [0 ... (NR_CPUS
-1)] = {
48 .persistent
= SLB_NUM_BOLTED
,
49 .buffer_length
= sizeof(struct slb_shadow
),
53 /* The Paca is an array with one entry per processor. Each contains an
54 * lppaca, which contains the information shared between the
55 * hypervisor and Linux.
56 * On systems with hardware multi-threading, there are two threads
57 * per processor. The Paca array must contain an entry for each thread.
58 * The VPD Areas will give a max logical processors = 2 * max physical
59 * processors. The processor VPD array needs one entry per physical
60 * processor (not thread).
62 struct paca_struct paca
[NR_CPUS
];
65 void __init
initialise_pacas(void)
69 /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB
70 * of the TOC can be addressed using a single machine instruction.
72 unsigned long kernel_toc
= (unsigned long)(&__toc_start
) + 0x8000UL
;
74 /* Can't use for_each_*_cpu, as they aren't functional yet */
75 for (cpu
= 0; cpu
< NR_CPUS
; cpu
++) {
76 struct paca_struct
*new_paca
= &paca
[cpu
];
78 new_paca
->lppaca_ptr
= &lppaca
[cpu
];
79 new_paca
->lock_token
= 0x8000;
80 new_paca
->paca_index
= cpu
;
81 new_paca
->kernel_toc
= kernel_toc
;
82 new_paca
->hw_cpu_id
= 0xffff;
83 new_paca
->slb_shadow_ptr
= &slb_shadow
[cpu
];
84 new_paca
->__current
= &init_task
;