Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * c 2001 PPC 64 Team, IBM Corp | |
3 | * | |
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. | |
8 | */ | |
9 | ||
1da177e4 LT |
10 | #include <linux/threads.h> |
11 | #include <linux/module.h> | |
1426d5a3 | 12 | #include <linux/lmb.h> |
1da177e4 | 13 | |
1426d5a3 | 14 | #include <asm/firmware.h> |
1da177e4 | 15 | #include <asm/lppaca.h> |
1da177e4 | 16 | #include <asm/paca.h> |
549e8152 | 17 | #include <asm/sections.h> |
dce6670a | 18 | #include <asm/pgtable.h> |
1426d5a3 ME |
19 | #include <asm/iseries/lpar_map.h> |
20 | #include <asm/iseries/hv_types.h> | |
1da177e4 LT |
21 | |
22 | /* This symbol is provided by the linker - let it fill in the paca | |
23 | * field correctly */ | |
24 | extern unsigned long __toc_start; | |
25 | ||
91c60b5b BH |
26 | #ifdef CONFIG_PPC_BOOK3S |
27 | ||
3356bb9f | 28 | /* |
30ff2e87 | 29 | * The structure which the hypervisor knows about - this structure |
3356bb9f DG |
30 | * should not cross a page boundary. The vpa_init/register_vpa call |
31 | * is now known to fail if the lppaca structure crosses a page | |
30ff2e87 SR |
32 | * boundary. The lppaca is also used on legacy iSeries and POWER5 |
33 | * pSeries boxes. The lppaca is 640 bytes long, and cannot readily | |
34 | * change since the hypervisor knows its layout, so a 1kB alignment | |
35 | * will suffice to ensure that it doesn't cross a page boundary. | |
3356bb9f DG |
36 | */ |
37 | struct lppaca lppaca[] = { | |
38 | [0 ... (NR_CPUS-1)] = { | |
39 | .desc = 0xd397d781, /* "LpPa" */ | |
40 | .size = sizeof(struct lppaca), | |
41 | .dyn_proc_status = 2, | |
42 | .decr_val = 0x00ff0000, | |
43 | .fpregs_in_use = 1, | |
44 | .end_of_quantum = 0xfffffffffffffffful, | |
45 | .slb_count = 64, | |
46 | .vmxregs_in_use = 0, | |
40900194 | 47 | .page_ins = 0, |
3356bb9f DG |
48 | }, |
49 | }; | |
50 | ||
91c60b5b BH |
51 | #endif /* CONFIG_PPC_BOOK3S */ |
52 | ||
53 | #ifdef CONFIG_PPC_STD_MMU_64 | |
54 | ||
2f6093c8 MN |
55 | /* |
56 | * 3 persistent SLBs are registered here. The buffer will be zero | |
57 | * initially, hence will all be invaild until we actually write them. | |
58 | */ | |
59 | struct slb_shadow slb_shadow[] __cacheline_aligned = { | |
60 | [0 ... (NR_CPUS-1)] = { | |
61 | .persistent = SLB_NUM_BOLTED, | |
62 | .buffer_length = sizeof(struct slb_shadow), | |
63 | }, | |
64 | }; | |
65 | ||
91c60b5b BH |
66 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
67 | ||
8882a4da | 68 | /* The Paca is an array with one entry per processor. Each contains an |
1da177e4 | 69 | * lppaca, which contains the information shared between the |
1888e7b5 | 70 | * hypervisor and Linux. |
1da177e4 LT |
71 | * On systems with hardware multi-threading, there are two threads |
72 | * per processor. The Paca array must contain an entry for each thread. | |
73 | * The VPD Areas will give a max logical processors = 2 * max physical | |
74 | * processors. The processor VPD array needs one entry per physical | |
75 | * processor (not thread). | |
76 | */ | |
1426d5a3 | 77 | struct paca_struct *paca; |
1da177e4 | 78 | EXPORT_SYMBOL(paca); |
90035fe3 | 79 | |
1426d5a3 | 80 | struct paca_struct boot_paca; |
90035fe3 | 81 | |
1426d5a3 ME |
82 | void __init initialise_paca(struct paca_struct *new_paca, int cpu) |
83 | { | |
84 | /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB | |
85 | * of the TOC can be addressed using a single machine instruction. | |
86 | */ | |
90035fe3 TB |
87 | unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL; |
88 | ||
91c60b5b | 89 | #ifdef CONFIG_PPC_BOOK3S |
1426d5a3 | 90 | new_paca->lppaca_ptr = &lppaca[cpu]; |
dce6670a | 91 | #else |
1426d5a3 | 92 | new_paca->kernel_pgd = swapper_pg_dir; |
91c60b5b | 93 | #endif |
1426d5a3 ME |
94 | new_paca->lock_token = 0x8000; |
95 | new_paca->paca_index = cpu; | |
96 | new_paca->kernel_toc = kernel_toc; | |
97 | new_paca->kernelbase = (unsigned long) _stext; | |
98 | new_paca->kernel_msr = MSR_KERNEL; | |
99 | new_paca->hw_cpu_id = 0xffff; | |
100 | new_paca->__current = &init_task; | |
91c60b5b | 101 | #ifdef CONFIG_PPC_STD_MMU_64 |
1426d5a3 | 102 | new_paca->slb_shadow_ptr = &slb_shadow[cpu]; |
91c60b5b | 103 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
1426d5a3 ME |
104 | } |
105 | ||
106 | static int __initdata paca_size; | |
107 | ||
108 | void __init allocate_pacas(void) | |
109 | { | |
110 | int nr_cpus, cpu, limit; | |
111 | ||
112 | /* | |
113 | * We can't take SLB misses on the paca, and we want to access them | |
114 | * in real mode, so allocate them within the RMA and also within | |
115 | * the first segment. On iSeries they must be within the area mapped | |
116 | * by the HV, which is HvPagesToMap * HVPAGESIZE bytes. | |
117 | */ | |
118 | limit = min(0x10000000ULL, lmb.rmo_size); | |
119 | if (firmware_has_feature(FW_FEATURE_ISERIES)) | |
120 | limit = min(limit, HvPagesToMap * HVPAGESIZE); | |
121 | ||
122 | nr_cpus = NR_CPUS; | |
123 | /* On iSeries we know we can never have more than 64 cpus */ | |
124 | if (firmware_has_feature(FW_FEATURE_ISERIES)) | |
125 | nr_cpus = min(64, nr_cpus); | |
126 | ||
127 | paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpus); | |
128 | ||
129 | paca = __va(lmb_alloc_base(paca_size, PAGE_SIZE, limit)); | |
130 | memset(paca, 0, paca_size); | |
131 | ||
132 | printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n", | |
133 | paca_size, nr_cpus, paca); | |
134 | ||
135 | /* Can't use for_each_*_cpu, as they aren't functional yet */ | |
136 | for (cpu = 0; cpu < nr_cpus; cpu++) | |
137 | initialise_paca(&paca[cpu], cpu); | |
138 | } | |
139 | ||
140 | void __init free_unused_pacas(void) | |
141 | { | |
142 | int new_size; | |
143 | ||
144 | new_size = PAGE_ALIGN(sizeof(struct paca_struct) * num_possible_cpus()); | |
145 | ||
146 | if (new_size >= paca_size) | |
147 | return; | |
148 | ||
149 | lmb_free(__pa(paca) + new_size, paca_size - new_size); | |
150 | ||
151 | printk(KERN_DEBUG "Freed %u bytes for unused pacas\n", | |
152 | paca_size - new_size); | |
90035fe3 | 153 | |
1426d5a3 | 154 | paca_size = new_size; |
90035fe3 | 155 | } |