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>
12 #include <linux/memblock.h>
14 #include <asm/firmware.h>
15 #include <asm/lppaca.h>
17 #include <asm/sections.h>
18 #include <asm/pgtable.h>
19 #include <asm/iseries/lpar_map.h>
20 #include <asm/iseries/hv_types.h>
21 #include <asm/kexec.h>
23 /* This symbol is provided by the linker - let it fill in the paca
25 extern unsigned long __toc_start
;
27 #ifdef CONFIG_PPC_BOOK3S
30 * We only have to have statically allocated lppaca structs on
31 * legacy iSeries, which supports at most 64 cpus.
33 #ifdef CONFIG_PPC_ISERIES
35 #define NR_LPPACAS NR_CPUS
39 #else /* not iSeries */
44 * The structure which the hypervisor knows about - this structure
45 * should not cross a page boundary. The vpa_init/register_vpa call
46 * is now known to fail if the lppaca structure crosses a page
47 * boundary. The lppaca is also used on legacy iSeries and POWER5
48 * pSeries boxes. The lppaca is 640 bytes long, and cannot readily
49 * change since the hypervisor knows its layout, so a 1kB alignment
50 * will suffice to ensure that it doesn't cross a page boundary.
52 struct lppaca lppaca
[] = {
53 [0 ... (NR_LPPACAS
-1)] = {
54 .desc
= 0xd397d781, /* "LpPa" */
55 .size
= sizeof(struct lppaca
),
57 .decr_val
= 0x00ff0000,
59 .end_of_quantum
= 0xfffffffffffffffful
,
66 static struct lppaca
*extra_lppacas
;
67 static long __initdata lppaca_size
;
69 static void allocate_lppacas(int nr_cpus
, unsigned long limit
)
71 if (nr_cpus
<= NR_LPPACAS
)
74 lppaca_size
= PAGE_ALIGN(sizeof(struct lppaca
) *
75 (nr_cpus
- NR_LPPACAS
));
76 extra_lppacas
= __va(memblock_alloc_base(lppaca_size
,
80 static struct lppaca
*new_lppaca(int cpu
)
87 lp
= extra_lppacas
+ (cpu
- NR_LPPACAS
);
93 static void free_lppacas(void)
95 long new_size
= 0, nr
;
99 nr
= num_possible_cpus() - NR_LPPACAS
;
101 new_size
= PAGE_ALIGN(nr
* sizeof(struct lppaca
));
102 if (new_size
>= lppaca_size
)
105 memblock_free(__pa(extra_lppacas
) + new_size
, lppaca_size
- new_size
);
106 lppaca_size
= new_size
;
111 static inline void allocate_lppacas(int nr_cpus
, unsigned long limit
) { }
112 static inline void free_lppacas(void) { }
114 #endif /* CONFIG_PPC_BOOK3S */
116 #ifdef CONFIG_PPC_STD_MMU_64
119 * 3 persistent SLBs are registered here. The buffer will be zero
120 * initially, hence will all be invaild until we actually write them.
122 struct slb_shadow slb_shadow
[] __cacheline_aligned
= {
123 [0 ... (NR_CPUS
-1)] = {
124 .persistent
= SLB_NUM_BOLTED
,
125 .buffer_length
= sizeof(struct slb_shadow
),
129 #endif /* CONFIG_PPC_STD_MMU_64 */
131 /* The Paca is an array with one entry per processor. Each contains an
132 * lppaca, which contains the information shared between the
133 * hypervisor and Linux.
134 * On systems with hardware multi-threading, there are two threads
135 * per processor. The Paca array must contain an entry for each thread.
136 * The VPD Areas will give a max logical processors = 2 * max physical
137 * processors. The processor VPD array needs one entry per physical
138 * processor (not thread).
140 struct paca_struct
*paca
;
143 struct paca_struct boot_paca
;
145 void __init
initialise_paca(struct paca_struct
*new_paca
, int cpu
)
147 /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB
148 * of the TOC can be addressed using a single machine instruction.
150 unsigned long kernel_toc
= (unsigned long)(&__toc_start
) + 0x8000UL
;
152 #ifdef CONFIG_PPC_BOOK3S
153 new_paca
->lppaca_ptr
= new_lppaca(cpu
);
155 new_paca
->kernel_pgd
= swapper_pg_dir
;
157 new_paca
->lock_token
= 0x8000;
158 new_paca
->paca_index
= cpu
;
159 new_paca
->kernel_toc
= kernel_toc
;
160 new_paca
->kernelbase
= (unsigned long) _stext
;
161 new_paca
->kernel_msr
= MSR_KERNEL
;
162 new_paca
->hw_cpu_id
= 0xffff;
163 new_paca
->kexec_state
= KEXEC_STATE_NONE
;
164 new_paca
->__current
= &init_task
;
165 #ifdef CONFIG_PPC_STD_MMU_64
166 new_paca
->slb_shadow_ptr
= &slb_shadow
[cpu
];
167 #endif /* CONFIG_PPC_STD_MMU_64 */
170 /* Put the paca pointer into r13 and SPRG_PACA */
171 void setup_paca(struct paca_struct
*new_paca
)
173 local_paca
= new_paca
;
174 mtspr(SPRN_SPRG_PACA
, local_paca
);
175 #ifdef CONFIG_PPC_BOOK3E
176 mtspr(SPRN_SPRG_TLB_EXFRAME
, local_paca
->extlb
);
180 static int __initdata paca_size
;
182 void __init
allocate_pacas(void)
184 int nr_cpus
, cpu
, limit
;
187 * We can't take SLB misses on the paca, and we want to access them
188 * in real mode, so allocate them within the RMA and also within
189 * the first segment. On iSeries they must be within the area mapped
190 * by the HV, which is HvPagesToMap * HVPAGESIZE bytes.
192 limit
= min(0x10000000ULL
, ppc64_rma_size
);
193 if (firmware_has_feature(FW_FEATURE_ISERIES
))
194 limit
= min(limit
, HvPagesToMap
* HVPAGESIZE
);
197 /* On iSeries we know we can never have more than 64 cpus */
198 if (firmware_has_feature(FW_FEATURE_ISERIES
))
199 nr_cpus
= min(64, nr_cpus
);
201 paca_size
= PAGE_ALIGN(sizeof(struct paca_struct
) * nr_cpus
);
203 paca
= __va(memblock_alloc_base(paca_size
, PAGE_SIZE
, limit
));
204 memset(paca
, 0, paca_size
);
206 printk(KERN_DEBUG
"Allocated %u bytes for %d pacas at %p\n",
207 paca_size
, nr_cpus
, paca
);
209 allocate_lppacas(nr_cpus
, limit
);
211 /* Can't use for_each_*_cpu, as they aren't functional yet */
212 for (cpu
= 0; cpu
< nr_cpus
; cpu
++)
213 initialise_paca(&paca
[cpu
], cpu
);
216 void __init
free_unused_pacas(void)
220 new_size
= PAGE_ALIGN(sizeof(struct paca_struct
) * num_possible_cpus());
222 if (new_size
>= paca_size
)
225 memblock_free(__pa(paca
) + new_size
, paca_size
- new_size
);
227 printk(KERN_DEBUG
"Freed %u bytes for unused pacas\n",
228 paca_size
- new_size
);
230 paca_size
= new_size
;
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