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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 | ||
10 | #include <linux/threads.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/memblock.h> | |
13 | ||
14 | #include <asm/firmware.h> | |
15 | #include <asm/lppaca.h> | |
16 | #include <asm/paca.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> | |
22 | ||
23 | /* This symbol is provided by the linker - let it fill in the paca | |
24 | * field correctly */ | |
25 | extern unsigned long __toc_start; | |
26 | ||
27 | #ifdef CONFIG_PPC_BOOK3S | |
28 | ||
29 | /* | |
30 | * The structure which the hypervisor knows about - this structure | |
31 | * should not cross a page boundary. The vpa_init/register_vpa call | |
32 | * is now known to fail if the lppaca structure crosses a page | |
33 | * boundary. The lppaca is also used on legacy iSeries and POWER5 | |
34 | * pSeries boxes. The lppaca is 640 bytes long, and cannot readily | |
35 | * change since the hypervisor knows its layout, so a 1kB alignment | |
36 | * will suffice to ensure that it doesn't cross a page boundary. | |
37 | */ | |
38 | struct lppaca lppaca[] = { | |
39 | [0 ... (NR_CPUS-1)] = { | |
40 | .desc = 0xd397d781, /* "LpPa" */ | |
41 | .size = sizeof(struct lppaca), | |
42 | .dyn_proc_status = 2, | |
43 | .decr_val = 0x00ff0000, | |
44 | .fpregs_in_use = 1, | |
45 | .end_of_quantum = 0xfffffffffffffffful, | |
46 | .slb_count = 64, | |
47 | .vmxregs_in_use = 0, | |
48 | .page_ins = 0, | |
49 | }, | |
50 | }; | |
51 | ||
52 | #endif /* CONFIG_PPC_BOOK3S */ | |
53 | ||
54 | #ifdef CONFIG_PPC_STD_MMU_64 | |
55 | ||
56 | /* | |
57 | * 3 persistent SLBs are registered here. The buffer will be zero | |
58 | * initially, hence will all be invaild until we actually write them. | |
59 | */ | |
60 | struct slb_shadow slb_shadow[] __cacheline_aligned = { | |
61 | [0 ... (NR_CPUS-1)] = { | |
62 | .persistent = SLB_NUM_BOLTED, | |
63 | .buffer_length = sizeof(struct slb_shadow), | |
64 | }, | |
65 | }; | |
66 | ||
67 | #endif /* CONFIG_PPC_STD_MMU_64 */ | |
68 | ||
69 | /* The Paca is an array with one entry per processor. Each contains an | |
70 | * lppaca, which contains the information shared between the | |
71 | * hypervisor and Linux. | |
72 | * On systems with hardware multi-threading, there are two threads | |
73 | * per processor. The Paca array must contain an entry for each thread. | |
74 | * The VPD Areas will give a max logical processors = 2 * max physical | |
75 | * processors. The processor VPD array needs one entry per physical | |
76 | * processor (not thread). | |
77 | */ | |
78 | struct paca_struct *paca; | |
79 | EXPORT_SYMBOL(paca); | |
80 | ||
81 | struct paca_struct boot_paca; | |
82 | ||
83 | void __init initialise_paca(struct paca_struct *new_paca, int cpu) | |
84 | { | |
85 | /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB | |
86 | * of the TOC can be addressed using a single machine instruction. | |
87 | */ | |
88 | unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL; | |
89 | ||
90 | #ifdef CONFIG_PPC_BOOK3S | |
91 | new_paca->lppaca_ptr = &lppaca[cpu]; | |
92 | #else | |
93 | new_paca->kernel_pgd = swapper_pg_dir; | |
94 | #endif | |
95 | new_paca->lock_token = 0x8000; | |
96 | new_paca->paca_index = cpu; | |
97 | new_paca->kernel_toc = kernel_toc; | |
98 | new_paca->kernelbase = (unsigned long) _stext; | |
99 | new_paca->kernel_msr = MSR_KERNEL; | |
100 | new_paca->hw_cpu_id = 0xffff; | |
101 | new_paca->kexec_state = KEXEC_STATE_NONE; | |
102 | new_paca->__current = &init_task; | |
103 | #ifdef CONFIG_PPC_STD_MMU_64 | |
104 | new_paca->slb_shadow_ptr = &slb_shadow[cpu]; | |
105 | #endif /* CONFIG_PPC_STD_MMU_64 */ | |
106 | } | |
107 | ||
108 | static int __initdata paca_size; | |
109 | ||
110 | void __init allocate_pacas(void) | |
111 | { | |
112 | int nr_cpus, cpu, limit; | |
113 | ||
114 | /* | |
115 | * We can't take SLB misses on the paca, and we want to access them | |
116 | * in real mode, so allocate them within the RMA and also within | |
117 | * the first segment. On iSeries they must be within the area mapped | |
118 | * by the HV, which is HvPagesToMap * HVPAGESIZE bytes. | |
119 | */ | |
120 | limit = min(0x10000000ULL, memblock.rmo_size); | |
121 | if (firmware_has_feature(FW_FEATURE_ISERIES)) | |
122 | limit = min(limit, HvPagesToMap * HVPAGESIZE); | |
123 | ||
124 | nr_cpus = NR_CPUS; | |
125 | /* On iSeries we know we can never have more than 64 cpus */ | |
126 | if (firmware_has_feature(FW_FEATURE_ISERIES)) | |
127 | nr_cpus = min(64, nr_cpus); | |
128 | ||
129 | paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpus); | |
130 | ||
131 | paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit)); | |
132 | memset(paca, 0, paca_size); | |
133 | ||
134 | printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n", | |
135 | paca_size, nr_cpus, paca); | |
136 | ||
137 | /* Can't use for_each_*_cpu, as they aren't functional yet */ | |
138 | for (cpu = 0; cpu < nr_cpus; cpu++) | |
139 | initialise_paca(&paca[cpu], cpu); | |
140 | } | |
141 | ||
142 | void __init free_unused_pacas(void) | |
143 | { | |
144 | int new_size; | |
145 | ||
146 | new_size = PAGE_ALIGN(sizeof(struct paca_struct) * num_possible_cpus()); | |
147 | ||
148 | if (new_size >= paca_size) | |
149 | return; | |
150 | ||
151 | memblock_free(__pa(paca) + new_size, paca_size - new_size); | |
152 | ||
153 | printk(KERN_DEBUG "Freed %u bytes for unused pacas\n", | |
154 | paca_size - new_size); | |
155 | ||
156 | paca_size = new_size; | |
157 | } |