osfmk/ppc/machine_routines.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 #include <ppc/machine_routines.h>
  23 #include <ppc/machine_cpu.h>
  24 #include <ppc/exception.h>
  25 #include <ppc/misc_protos.h>
  26 #include <ppc/Firmware.h>
  27 #include <vm/vm_page.h>
  28 #include <ppc/pmap.h>
  29 #include <ppc/proc_reg.h>
  30 #include <kern/processor.h>
  31
  32 boolean_t get_interrupts_enabled(void);
  33
  34 /* Map memory map IO space */
  35 vm_offset_t
  36 ml_io_map(
  37         vm_offset_t phys_addr,
  38         vm_size_t size)
  39 {
  40         return(io_map(phys_addr,size));
  41 }
  42
  43 /* static memory allocation */
  44 vm_offset_t
  45 ml_static_malloc(
  46         vm_size_t size)
  47 {
  48         extern vm_offset_t static_memory_end;
  49         extern boolean_t pmap_initialized;
  50         vm_offset_t vaddr;
  51
  52         if (pmap_initialized)
  53                 return((vm_offset_t)NULL);
  54         else {
  55                 vaddr = static_memory_end;
  56                 static_memory_end = round_page(vaddr+size);
  57                 return(vaddr);
  58         }
  59 }
  60
  61 vm_offset_t
  62 ml_static_ptovirt(
  63         vm_offset_t paddr)
  64 {
  65         extern vm_offset_t static_memory_end;
  66         vm_offset_t vaddr;
  67
  68         /* Static memory is map V=R */
  69         vaddr = paddr;
  70         if ( (vaddr < static_memory_end) && (pmap_extract(kernel_pmap, vaddr)==paddr) )
  71                 return(vaddr);
  72         else
  73                 return((vm_offset_t)NULL);
  74 }
  75
  76 void
  77 ml_static_mfree(
  78         vm_offset_t vaddr,
  79         vm_size_t size)
  80 {
  81         vm_offset_t paddr_cur, vaddr_cur;
  82
  83         for (vaddr_cur = round_page(vaddr);
  84              vaddr_cur < trunc_page(vaddr+size);
  85              vaddr_cur += PAGE_SIZE) {
  86                 paddr_cur = pmap_extract(kernel_pmap, vaddr_cur);
  87                 if (paddr_cur != (vm_offset_t)NULL) {
  88                         vm_page_wire_count--;
  89                         pmap_remove(kernel_pmap, vaddr_cur, vaddr_cur+PAGE_SIZE);
  90                         vm_page_create(paddr_cur,paddr_cur+PAGE_SIZE);
  91                 }
  92         }
  93 }
  94
  95 /* virtual to physical on wired pages */
  96 vm_offset_t ml_vtophys(
  97         vm_offset_t vaddr)
  98 {
  99         return(pmap_extract(kernel_pmap, vaddr));
 100 }
 101
 102 /* Initialize Interrupt Handler */
 103 void ml_install_interrupt_handler(
 104         void *nub,
 105         int source,
 106         void *target,
 107         IOInterruptHandler handler,
 108         void *refCon)
 109 {
 110         int     current_cpu;
 111         boolean_t current_state;
 112
 113         current_cpu = cpu_number();
 114         current_state = ml_get_interrupts_enabled();
 115
 116         per_proc_info[current_cpu].interrupt_nub     = nub;
 117         per_proc_info[current_cpu].interrupt_source  = source;
 118         per_proc_info[current_cpu].interrupt_target  = target;
 119         per_proc_info[current_cpu].interrupt_handler = handler;
 120         per_proc_info[current_cpu].interrupt_refCon  = refCon;
 121
 122         per_proc_info[current_cpu].interrupts_enabled = TRUE;
 123         (void) ml_set_interrupts_enabled(current_state);
 124 }
 125
 126 /* Initialize Interrupts */
 127 void ml_init_interrupt(void)
 128 {
 129         int     current_cpu;
 130         boolean_t current_state;
 131
 132         current_state = ml_get_interrupts_enabled();
 133
 134         current_cpu = cpu_number();
 135         per_proc_info[current_cpu].interrupts_enabled = TRUE;
 136         (void) ml_set_interrupts_enabled(current_state);
 137 }
 138
 139 boolean_t fake_get_interrupts_enabled(void)
 140 {
 141         /*
 142          * The scheduler is not active on this cpu. There is no need to disable
 143          * preemption. The current thread wont be dispatched on anhother cpu.
 144          */
 145         return((per_proc_info[cpu_number()].cpu_flags & turnEEon) != 0);
 146 }
 147
 148 boolean_t fake_set_interrupts_enabled(boolean_t enable)
 149 {
 150         boolean_t interrupt_state_prev;
 151
 152         /*
 153          * The scheduler is not active on this cpu. There is no need to disable
 154          * preemption. The current thread wont be dispatched on anhother cpu.
 155          */
 156         interrupt_state_prev =
 157                 (per_proc_info[cpu_number()].cpu_flags & turnEEon) != 0;
 158         if (interrupt_state_prev != enable)
 159                 per_proc_info[cpu_number()].cpu_flags ^= turnEEon;
 160         return(interrupt_state_prev);
 161 }
 162
 163 /* Get Interrupts Enabled */
 164 boolean_t ml_get_interrupts_enabled(void)
 165 {
 166         if (per_proc_info[cpu_number()].interrupts_enabled == TRUE)
 167                 return(get_interrupts_enabled());
 168         else
 169                 return(fake_get_interrupts_enabled());
 170 }
 171
 172 boolean_t get_interrupts_enabled(void)
 173 {
 174         return((mfmsr() & MASK(MSR_EE)) != 0);
 175 }
 176
 177 /* Check if running at interrupt context */
 178 boolean_t ml_at_interrupt_context(void)
 179 {
 180         boolean_t       ret;
 181         boolean_t       current_state;
 182
 183         current_state = ml_set_interrupts_enabled(FALSE);
 184         ret = (per_proc_info[cpu_number()].istackptr == 0);
 185         ml_set_interrupts_enabled(current_state);
 186         return(ret);
 187 }
 188
 189 /* Generate a fake interrupt */
 190 void ml_cause_interrupt(void)
 191 {
 192         CreateFakeIO();
 193 }
 194
 195 void machine_idle(void)
 196 {
 197         if (per_proc_info[cpu_number()].interrupts_enabled == TRUE) {
 198                 int cur_decr;
 199
 200                 machine_idle_ppc();
 201
 202                 /*
 203                  * protect against a lost decrementer trap
 204                  * if the current decrementer value is negative
 205                  * by more than 10 ticks, re-arm it since it's
 206                  * unlikely to fire at this point... a hardware
 207                  * interrupt got us out of machine_idle and may
 208                  * also be contributing to this state
 209                  */
 210                 cur_decr = isync_mfdec();
 211
 212                 if (cur_decr < -10) {
 213                         mtdec(1);
 214                 }
 215         }
 216 }
 217
 218 void
 219 machine_signal_idle(
 220         processor_t processor)
 221 {
 222         (void)cpu_signal(processor->slot_num, SIGPwake, 0, 0);
 223 }
 224
 225 kern_return_t
 226 ml_processor_register(
 227         ml_processor_info_t *processor_info,
 228         processor_t         *processor,
 229         ipi_handler_t       *ipi_handler)
 230 {
 231         kern_return_t ret;
 232         int target_cpu;
 233
 234         if (processor_info->boot_cpu == FALSE) {
 235                  if (cpu_register(&target_cpu) != KERN_SUCCESS)
 236                         return KERN_FAILURE;
 237         } else {
 238                 /* boot_cpu is always 0 */
 239                 target_cpu= 0;
 240         }
 241
 242         per_proc_info[target_cpu].cpu_id = processor_info->cpu_id;
 243         per_proc_info[target_cpu].start_paddr = processor_info->start_paddr;
 244
 245         if(per_proc_info[target_cpu].pf.Available & pfCanNap)
 246           if(processor_info->supports_nap)
 247                 per_proc_info[target_cpu].pf.Available |= pfWillNap;
 248
 249         if(processor_info->time_base_enable !=  (void(*)(cpu_id_t, boolean_t ))NULL)
 250                 per_proc_info[target_cpu].time_base_enable = processor_info->time_base_enable;
 251         else
 252                 per_proc_info[target_cpu].time_base_enable = (void(*)(cpu_id_t, boolean_t ))NULL;
 253
 254         if(target_cpu == cpu_number())
 255                 __asm__ volatile("mtsprg 2,%0" : : "r" (per_proc_info[target_cpu].pf.Available));       /* Set live value */
 256
 257         *processor = cpu_to_processor(target_cpu);
 258         *ipi_handler = cpu_signal_handler;
 259
 260         return KERN_SUCCESS;
 261 }
 262
 263 boolean_t
 264 ml_enable_nap(int target_cpu, boolean_t nap_enabled)
 265 {
 266     boolean_t prev_value = (per_proc_info[target_cpu].pf.Available & pfCanNap) && (per_proc_info[target_cpu].pf.Available & pfWillNap);
 267
 268         if(per_proc_info[target_cpu].pf.Available & pfCanNap) {                         /* Can the processor nap? */
 269                 if (nap_enabled) per_proc_info[target_cpu].pf.Available |= pfWillNap;   /* Is nap supported on this machine? */
 270                 else per_proc_info[target_cpu].pf.Available &= ~pfWillNap;              /* Clear if not */
 271         }
 272
 273         if(target_cpu == cpu_number())
 274                 __asm__ volatile("mtsprg 2,%0" : : "r" (per_proc_info[target_cpu].pf.Available));       /* Set live value */
 275
 276     return (prev_value);
 277 }
 278
 279 void
 280 ml_ppc_get_info(ml_ppc_cpu_info_t *cpu_info)
 281 {
 282   if (cpu_info == 0) return;
 283
 284   cpu_info->vector_unit = (per_proc_info[0].pf.Available & pfAltivec) != 0;
 285   cpu_info->cache_line_size = per_proc_info[0].pf.lineSize;
 286   cpu_info->l1_icache_size = per_proc_info[0].pf.l1iSize;
 287   cpu_info->l1_dcache_size = per_proc_info[0].pf.l1dSize;
 288
 289   if (per_proc_info[0].pf.Available & pfL2) {
 290     cpu_info->l2_settings = per_proc_info[0].pf.l2cr;
 291     cpu_info->l2_cache_size = per_proc_info[0].pf.l2Size;
 292   } else {
 293     cpu_info->l2_settings = 0;
 294     cpu_info->l2_cache_size = 0xFFFFFFFF;
 295   }
 296   if (per_proc_info[0].pf.Available & pfL3) {
 297     cpu_info->l3_settings = per_proc_info[0].pf.l3cr;
 298     cpu_info->l3_cache_size = per_proc_info[0].pf.l3Size;
 299   } else {
 300     cpu_info->l3_settings = 0;
 301     cpu_info->l3_cache_size = 0xFFFFFFFF;
 302   }
 303 }
 304
 305 void
 306 init_ast_check(processor_t processor)
 307 {}
 308
 309 void
 310 cause_ast_check(processor_t processor)
 311 {
 312         if ((processor != current_processor())
 313             && (per_proc_info[processor->slot_num].interrupts_enabled == TRUE))
 314                 cpu_signal(processor->slot_num, SIGPast, NULL, NULL);
 315 }
 316
 317 thread_t
 318 switch_to_shutdown_context(
 319         thread_t        thread,
 320         void            (*doshutdown)(processor_t),
 321         processor_t     processor)
 322 {
 323         disable_preemption();
 324         CreateShutdownCTX();
 325         enable_preemption();
 326         return((thread_t)(per_proc_info[cpu_number()].old_thread));
 327 }
 328
 329 int
 330 set_be_bit()
 331 {
 332
 333         int mycpu;
 334         boolean_t current_state;
 335
 336         current_state = ml_set_interrupts_enabled(FALSE);       /* Can't allow interruptions when mucking with per_proc flags */
 337         mycpu = cpu_number();
 338         per_proc_info[mycpu].cpu_flags |= traceBE;
 339         (void) ml_set_interrupts_enabled(current_state);
 340         return(1);
 341 }
 342
 343 int
 344 clr_be_bit()
 345 {
 346         int mycpu;
 347         boolean_t current_state;
 348
 349         current_state = ml_set_interrupts_enabled(FALSE);       /* Can't allow interruptions when mucking with per_proc flags */
 350         mycpu = cpu_number();
 351         per_proc_info[mycpu].cpu_flags &= ~traceBE;
 352         (void) ml_set_interrupts_enabled(current_state);
 353         return(1);
 354 }
 355
 356 int
 357 be_tracing()
 358 {
 359   int mycpu = cpu_number();
 360   return(per_proc_info[mycpu].cpu_flags & traceBE);
 361 }
 362