Commit | Line | Data |
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d3561b7f RR |
1 | /* Paravirtualization interfaces |
2 | Copyright (C) 2006 Rusty Russell IBM Corporation | |
3 | ||
4 | This program is free software; you can redistribute it and/or modify | |
5 | it under the terms of the GNU General Public License as published by | |
6 | the Free Software Foundation; either version 2 of the License, or | |
7 | (at your option) any later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
15 | along with this program; if not, write to the Free Software | |
16 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | #include <linux/errno.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/efi.h> | |
21 | #include <linux/bcd.h> | |
c9ccf30d | 22 | #include <linux/start_kernel.h> |
ce6234b5 | 23 | #include <linux/highmem.h> |
d3561b7f RR |
24 | |
25 | #include <asm/bug.h> | |
26 | #include <asm/paravirt.h> | |
27 | #include <asm/desc.h> | |
28 | #include <asm/setup.h> | |
29 | #include <asm/arch_hooks.h> | |
30 | #include <asm/time.h> | |
31 | #include <asm/irq.h> | |
32 | #include <asm/delay.h> | |
13623d79 RR |
33 | #include <asm/fixmap.h> |
34 | #include <asm/apic.h> | |
da181a8b | 35 | #include <asm/tlbflush.h> |
6cb9a835 | 36 | #include <asm/timer.h> |
d3561b7f RR |
37 | |
38 | /* nop stub */ | |
45876233 | 39 | void _paravirt_nop(void) |
d3561b7f RR |
40 | { |
41 | } | |
42 | ||
43 | static void __init default_banner(void) | |
44 | { | |
45 | printk(KERN_INFO "Booting paravirtualized kernel on %s\n", | |
46 | paravirt_ops.name); | |
47 | } | |
48 | ||
49 | char *memory_setup(void) | |
50 | { | |
51 | return paravirt_ops.memory_setup(); | |
52 | } | |
53 | ||
139ec7c4 RR |
54 | /* Simple instruction patching code. */ |
55 | #define DEF_NATIVE(name, code) \ | |
56 | extern const char start_##name[], end_##name[]; \ | |
57 | asm("start_" #name ": " code "; end_" #name ":") | |
63f70270 JF |
58 | |
59 | DEF_NATIVE(irq_disable, "cli"); | |
60 | DEF_NATIVE(irq_enable, "sti"); | |
61 | DEF_NATIVE(restore_fl, "push %eax; popf"); | |
62 | DEF_NATIVE(save_fl, "pushf; pop %eax"); | |
139ec7c4 | 63 | DEF_NATIVE(iret, "iret"); |
63f70270 JF |
64 | DEF_NATIVE(irq_enable_sysexit, "sti; sysexit"); |
65 | DEF_NATIVE(read_cr2, "mov %cr2, %eax"); | |
66 | DEF_NATIVE(write_cr3, "mov %eax, %cr3"); | |
67 | DEF_NATIVE(read_cr3, "mov %cr3, %eax"); | |
68 | DEF_NATIVE(clts, "clts"); | |
69 | DEF_NATIVE(read_tsc, "rdtsc"); | |
139ec7c4 | 70 | |
63f70270 | 71 | DEF_NATIVE(ud2a, "ud2a"); |
139ec7c4 RR |
72 | |
73 | static unsigned native_patch(u8 type, u16 clobbers, void *insns, unsigned len) | |
74 | { | |
63f70270 JF |
75 | const unsigned char *start, *end; |
76 | unsigned ret; | |
77 | ||
78 | switch(type) { | |
79 | #define SITE(x) case PARAVIRT_PATCH(x): start = start_##x; end = end_##x; goto patch_site | |
80 | SITE(irq_disable); | |
81 | SITE(irq_enable); | |
82 | SITE(restore_fl); | |
83 | SITE(save_fl); | |
84 | SITE(iret); | |
85 | SITE(irq_enable_sysexit); | |
86 | SITE(read_cr2); | |
87 | SITE(read_cr3); | |
88 | SITE(write_cr3); | |
89 | SITE(clts); | |
90 | SITE(read_tsc); | |
91 | #undef SITE | |
92 | ||
93 | patch_site: | |
94 | ret = paravirt_patch_insns(insns, len, start, end); | |
95 | break; | |
96 | ||
97 | case PARAVIRT_PATCH(make_pgd): | |
98 | case PARAVIRT_PATCH(make_pte): | |
99 | case PARAVIRT_PATCH(pgd_val): | |
100 | case PARAVIRT_PATCH(pte_val): | |
101 | #ifdef CONFIG_X86_PAE | |
102 | case PARAVIRT_PATCH(make_pmd): | |
103 | case PARAVIRT_PATCH(pmd_val): | |
104 | #endif | |
105 | /* These functions end up returning exactly what | |
106 | they're passed, in the same registers. */ | |
107 | ret = paravirt_patch_nop(); | |
108 | break; | |
109 | ||
110 | default: | |
111 | ret = paravirt_patch_default(type, clobbers, insns, len); | |
112 | break; | |
113 | } | |
114 | ||
115 | return ret; | |
116 | } | |
117 | ||
118 | unsigned paravirt_patch_nop(void) | |
119 | { | |
120 | return 0; | |
121 | } | |
122 | ||
123 | unsigned paravirt_patch_ignore(unsigned len) | |
124 | { | |
125 | return len; | |
126 | } | |
127 | ||
128 | unsigned paravirt_patch_call(void *target, u16 tgt_clobbers, | |
129 | void *site, u16 site_clobbers, | |
130 | unsigned len) | |
131 | { | |
132 | unsigned char *call = site; | |
133 | unsigned long delta = (unsigned long)target - (unsigned long)(call+5); | |
134 | ||
135 | if (tgt_clobbers & ~site_clobbers) | |
136 | return len; /* target would clobber too much for this site */ | |
137 | if (len < 5) | |
138 | return len; /* call too long for patch site */ | |
139ec7c4 | 139 | |
63f70270 JF |
140 | *call++ = 0xe8; /* call */ |
141 | *(unsigned long *)call = delta; | |
139ec7c4 | 142 | |
63f70270 JF |
143 | return 5; |
144 | } | |
145 | ||
146 | unsigned paravirt_patch_jmp(void *target, void *site, unsigned len) | |
147 | { | |
148 | unsigned char *jmp = site; | |
149 | unsigned long delta = (unsigned long)target - (unsigned long)(jmp+5); | |
150 | ||
151 | if (len < 5) | |
152 | return len; /* call too long for patch site */ | |
153 | ||
154 | *jmp++ = 0xe9; /* jmp */ | |
155 | *(unsigned long *)jmp = delta; | |
156 | ||
157 | return 5; | |
158 | } | |
159 | ||
160 | unsigned paravirt_patch_default(u8 type, u16 clobbers, void *site, unsigned len) | |
161 | { | |
162 | void *opfunc = *((void **)¶virt_ops + type); | |
163 | unsigned ret; | |
164 | ||
165 | if (opfunc == NULL) | |
166 | /* If there's no function, patch it with a ud2a (BUG) */ | |
167 | ret = paravirt_patch_insns(site, len, start_ud2a, end_ud2a); | |
168 | else if (opfunc == paravirt_nop) | |
169 | /* If the operation is a nop, then nop the callsite */ | |
170 | ret = paravirt_patch_nop(); | |
171 | else if (type == PARAVIRT_PATCH(iret) || | |
172 | type == PARAVIRT_PATCH(irq_enable_sysexit)) | |
173 | /* If operation requires a jmp, then jmp */ | |
174 | ret = paravirt_patch_jmp(opfunc, site, len); | |
175 | else | |
176 | /* Otherwise call the function; assume target could | |
177 | clobber any caller-save reg */ | |
178 | ret = paravirt_patch_call(opfunc, CLBR_ANY, | |
179 | site, clobbers, len); | |
180 | ||
181 | return ret; | |
182 | } | |
183 | ||
184 | unsigned paravirt_patch_insns(void *site, unsigned len, | |
185 | const char *start, const char *end) | |
186 | { | |
187 | unsigned insn_len = end - start; | |
139ec7c4 | 188 | |
63f70270 JF |
189 | if (insn_len > len || start == NULL) |
190 | insn_len = len; | |
191 | else | |
192 | memcpy(site, start, insn_len); | |
139ec7c4 | 193 | |
139ec7c4 RR |
194 | return insn_len; |
195 | } | |
196 | ||
d3561b7f RR |
197 | void init_IRQ(void) |
198 | { | |
199 | paravirt_ops.init_IRQ(); | |
200 | } | |
201 | ||
1a1eecd1 | 202 | static void native_flush_tlb(void) |
da181a8b RR |
203 | { |
204 | __native_flush_tlb(); | |
205 | } | |
206 | ||
207 | /* | |
208 | * Global pages have to be flushed a bit differently. Not a real | |
209 | * performance problem because this does not happen often. | |
210 | */ | |
1a1eecd1 | 211 | static void native_flush_tlb_global(void) |
da181a8b RR |
212 | { |
213 | __native_flush_tlb_global(); | |
214 | } | |
215 | ||
63f70270 | 216 | static void native_flush_tlb_single(unsigned long addr) |
da181a8b RR |
217 | { |
218 | __native_flush_tlb_single(addr); | |
219 | } | |
220 | ||
d3561b7f | 221 | /* These are in entry.S */ |
1a1eecd1 AK |
222 | extern void native_iret(void); |
223 | extern void native_irq_enable_sysexit(void); | |
d3561b7f RR |
224 | |
225 | static int __init print_banner(void) | |
226 | { | |
227 | paravirt_ops.banner(); | |
228 | return 0; | |
229 | } | |
230 | core_initcall(print_banner); | |
231 | ||
232 | struct paravirt_ops paravirt_ops = { | |
233 | .name = "bare hardware", | |
234 | .paravirt_enabled = 0, | |
235 | .kernel_rpl = 0, | |
5311ab62 | 236 | .shared_kernel_pmd = 1, /* Only used when CONFIG_X86_PAE is set */ |
d3561b7f | 237 | |
139ec7c4 | 238 | .patch = native_patch, |
d3561b7f | 239 | .banner = default_banner, |
45876233 | 240 | .arch_setup = paravirt_nop, |
d3561b7f RR |
241 | .memory_setup = machine_specific_memory_setup, |
242 | .get_wallclock = native_get_wallclock, | |
243 | .set_wallclock = native_set_wallclock, | |
e30fab3a | 244 | .time_init = hpet_time_init, |
d3561b7f RR |
245 | .init_IRQ = native_init_IRQ, |
246 | ||
247 | .cpuid = native_cpuid, | |
248 | .get_debugreg = native_get_debugreg, | |
249 | .set_debugreg = native_set_debugreg, | |
250 | .clts = native_clts, | |
251 | .read_cr0 = native_read_cr0, | |
252 | .write_cr0 = native_write_cr0, | |
253 | .read_cr2 = native_read_cr2, | |
254 | .write_cr2 = native_write_cr2, | |
255 | .read_cr3 = native_read_cr3, | |
256 | .write_cr3 = native_write_cr3, | |
257 | .read_cr4 = native_read_cr4, | |
258 | .read_cr4_safe = native_read_cr4_safe, | |
259 | .write_cr4 = native_write_cr4, | |
260 | .save_fl = native_save_fl, | |
261 | .restore_fl = native_restore_fl, | |
262 | .irq_disable = native_irq_disable, | |
263 | .irq_enable = native_irq_enable, | |
264 | .safe_halt = native_safe_halt, | |
265 | .halt = native_halt, | |
266 | .wbinvd = native_wbinvd, | |
90a0a06a RR |
267 | .read_msr = native_read_msr_safe, |
268 | .write_msr = native_write_msr_safe, | |
d3561b7f RR |
269 | .read_tsc = native_read_tsc, |
270 | .read_pmc = native_read_pmc, | |
6cb9a835 | 271 | .get_scheduled_cycles = native_read_tsc, |
1182d852 | 272 | .get_cpu_khz = native_calculate_cpu_khz, |
d3561b7f RR |
273 | .load_tr_desc = native_load_tr_desc, |
274 | .set_ldt = native_set_ldt, | |
275 | .load_gdt = native_load_gdt, | |
276 | .load_idt = native_load_idt, | |
277 | .store_gdt = native_store_gdt, | |
278 | .store_idt = native_store_idt, | |
279 | .store_tr = native_store_tr, | |
280 | .load_tls = native_load_tls, | |
90a0a06a RR |
281 | .write_ldt_entry = write_dt_entry, |
282 | .write_gdt_entry = write_dt_entry, | |
283 | .write_idt_entry = write_dt_entry, | |
d3561b7f RR |
284 | .load_esp0 = native_load_esp0, |
285 | ||
286 | .set_iopl_mask = native_set_iopl_mask, | |
287 | .io_delay = native_io_delay, | |
d3561b7f | 288 | |
13623d79 RR |
289 | #ifdef CONFIG_X86_LOCAL_APIC |
290 | .apic_write = native_apic_write, | |
291 | .apic_write_atomic = native_apic_write_atomic, | |
292 | .apic_read = native_apic_read, | |
bbab4f3b ZA |
293 | .setup_boot_clock = setup_boot_APIC_clock, |
294 | .setup_secondary_clock = setup_secondary_APIC_clock, | |
13623d79 | 295 | #endif |
45876233 | 296 | .set_lazy_mode = paravirt_nop, |
13623d79 | 297 | |
b239fb25 JF |
298 | .pagetable_setup_start = native_pagetable_setup_start, |
299 | .pagetable_setup_done = native_pagetable_setup_done, | |
300 | ||
da181a8b RR |
301 | .flush_tlb_user = native_flush_tlb, |
302 | .flush_tlb_kernel = native_flush_tlb_global, | |
303 | .flush_tlb_single = native_flush_tlb_single, | |
d4c10477 | 304 | .flush_tlb_others = native_flush_tlb_others, |
da181a8b | 305 | |
45876233 JF |
306 | .alloc_pt = paravirt_nop, |
307 | .alloc_pd = paravirt_nop, | |
308 | .alloc_pd_clone = paravirt_nop, | |
309 | .release_pt = paravirt_nop, | |
310 | .release_pd = paravirt_nop, | |
c119ecce | 311 | |
da181a8b RR |
312 | .set_pte = native_set_pte, |
313 | .set_pte_at = native_set_pte_at, | |
314 | .set_pmd = native_set_pmd, | |
45876233 JF |
315 | .pte_update = paravirt_nop, |
316 | .pte_update_defer = paravirt_nop, | |
3dc494e8 | 317 | |
ce6234b5 JF |
318 | #ifdef CONFIG_HIGHPTE |
319 | .kmap_atomic_pte = kmap_atomic, | |
320 | #endif | |
321 | ||
da181a8b RR |
322 | #ifdef CONFIG_X86_PAE |
323 | .set_pte_atomic = native_set_pte_atomic, | |
324 | .set_pte_present = native_set_pte_present, | |
325 | .set_pud = native_set_pud, | |
326 | .pte_clear = native_pte_clear, | |
327 | .pmd_clear = native_pmd_clear, | |
3dc494e8 JF |
328 | |
329 | .pmd_val = native_pmd_val, | |
330 | .make_pmd = native_make_pmd, | |
da181a8b RR |
331 | #endif |
332 | ||
3dc494e8 JF |
333 | .pte_val = native_pte_val, |
334 | .pgd_val = native_pgd_val, | |
335 | ||
336 | .make_pte = native_make_pte, | |
337 | .make_pgd = native_make_pgd, | |
338 | ||
d3561b7f RR |
339 | .irq_enable_sysexit = native_irq_enable_sysexit, |
340 | .iret = native_iret, | |
ae5da273 | 341 | |
d6dd61c8 JF |
342 | .dup_mmap = paravirt_nop, |
343 | .exit_mmap = paravirt_nop, | |
344 | .activate_mm = paravirt_nop, | |
345 | ||
45876233 | 346 | .startup_ipi_hook = paravirt_nop, |
d3561b7f | 347 | }; |
0dbe5a11 | 348 | |
21564fd2 | 349 | EXPORT_SYMBOL(paravirt_ops); |