2 2005.12 yhlu add coreboot_ram cross the vga font buffer handling
3 2005.12 yhlu add CONFIG_RAMBASE above 1M support for SMP
4 2008.05 stepan add support for going back to sipi wait state
7 #include <cpu/x86/lapic.h>
10 #include <console/console.h>
12 #include <device/device.h>
13 #include <device/path.h>
14 #include <smp/atomic.h>
15 #include <smp/spinlock.h>
19 /* This is a lot more paranoid now, since Linux can NOT handle
20 * being told there is a CPU when none exists. So any errors
21 * will return 0, meaning no CPU.
23 * We actually handling that case by noting which cpus startup
24 * and not telling anyone about the ones that dont.
26 static unsigned long get_valid_start_eip(unsigned long orig_start_eip)
28 return (unsigned long)orig_start_eip & 0xffff; // 16 bit to avoid 0xa0000
31 #if CONFIG_HAVE_ACPI_RESUME == 1
33 char *lowmem_backup_ptr;
34 int lowmem_backup_size;
37 extern char _secondary_start[];
39 static void copy_secondary_start_to_1m_below(void)
41 extern char _secondary_start_end[];
42 unsigned long code_size;
43 unsigned long start_eip;
45 /* _secondary_start need to be masked 20 above bit, because 16 bit code in secondary.S
46 Also We need to copy the _secondary_start to the below 1M region
48 start_eip = get_valid_start_eip((unsigned long)_secondary_start);
49 code_size = (unsigned long)_secondary_start_end - (unsigned long)_secondary_start;
51 #if CONFIG_HAVE_ACPI_RESUME == 1
52 /* need to save it for RAM resume */
53 lowmem_backup_size = code_size;
54 lowmem_backup = malloc(code_size);
55 lowmem_backup_ptr = (char *)start_eip;
57 if (lowmem_backup == NULL)
58 die("Out of backup memory\n");
60 memcpy(lowmem_backup, lowmem_backup_ptr, lowmem_backup_size);
62 /* copy the _secondary_start to the ram below 1M*/
63 memcpy((unsigned char *)start_eip, (unsigned char *)_secondary_start, code_size);
65 printk(BIOS_DEBUG, "start_eip=0x%08lx, offset=0x%08lx, code_size=0x%08lx\n", start_eip, ((unsigned long)_secondary_start - start_eip), code_size);
68 static int lapic_start_cpu(unsigned long apicid)
71 unsigned long send_status, accept_status, start_eip;
72 int j, num_starts, maxlvt;
75 * Starting actual IPI sequence...
78 printk(BIOS_SPEW, "Asserting INIT.\n");
81 * Turn INIT on target chip
83 lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(apicid));
89 lapic_write_around(LAPIC_ICR, LAPIC_INT_LEVELTRIG | LAPIC_INT_ASSERT
92 printk(BIOS_SPEW, "Waiting for send to finish...\n");
95 printk(BIOS_SPEW, "+");
97 send_status = lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY;
98 } while (send_status && (timeout++ < 1000));
99 if (timeout >= 1000) {
100 printk(BIOS_ERR, "CPU %ld: First apic write timed out. Disabling\n",
103 printk(BIOS_ERR, "ESR is 0x%lx\n", lapic_read(LAPIC_ESR));
104 if (lapic_read(LAPIC_ESR)) {
105 printk(BIOS_ERR, "Try to reset ESR\n");
106 lapic_write_around(LAPIC_ESR, 0);
107 printk(BIOS_ERR, "ESR is 0x%lx\n", lapic_read(LAPIC_ESR));
111 #if !defined (CONFIG_CPU_AMD_MODEL_10XXX) && !defined (CONFIG_CPU_AMD_MODEL_14XXX)
115 printk(BIOS_SPEW, "Deasserting INIT.\n");
118 lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(apicid));
121 lapic_write_around(LAPIC_ICR, LAPIC_INT_LEVELTRIG | LAPIC_DM_INIT);
123 printk(BIOS_SPEW, "Waiting for send to finish...\n");
126 printk(BIOS_SPEW, "+");
128 send_status = lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY;
129 } while (send_status && (timeout++ < 1000));
130 if (timeout >= 1000) {
131 printk(BIOS_ERR, "CPU %ld: Second apic write timed out. Disabling\n",
137 start_eip = get_valid_start_eip((unsigned long)_secondary_start);
139 #if !defined (CONFIG_CPU_AMD_MODEL_10XXX) && !defined (CONFIG_CPU_AMD_MODEL_14XXX)
146 * Run STARTUP IPI loop.
148 printk(BIOS_SPEW, "#startup loops: %d.\n", num_starts);
152 for (j = 1; j <= num_starts; j++) {
153 printk(BIOS_SPEW, "Sending STARTUP #%d to %lu.\n", j, apicid);
154 lapic_read_around(LAPIC_SPIV);
155 lapic_write(LAPIC_ESR, 0);
156 lapic_read(LAPIC_ESR);
157 printk(BIOS_SPEW, "After apic_write.\n");
164 lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(apicid));
166 /* Boot on the stack */
167 /* Kick the second */
168 lapic_write_around(LAPIC_ICR, LAPIC_DM_STARTUP
169 | (start_eip >> 12));
172 * Give the other CPU some time to accept the IPI.
176 printk(BIOS_SPEW, "Startup point 1.\n");
178 printk(BIOS_SPEW, "Waiting for send to finish...\n");
181 printk(BIOS_SPEW, "+");
183 send_status = lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY;
184 } while (send_status && (timeout++ < 1000));
187 * Give the other CPU some time to accept the IPI.
191 * Due to the Pentium erratum 3AP.
194 lapic_read_around(LAPIC_SPIV);
195 lapic_write(LAPIC_ESR, 0);
197 accept_status = (lapic_read(LAPIC_ESR) & 0xEF);
198 if (send_status || accept_status)
201 printk(BIOS_SPEW, "After Startup.\n");
203 printk(BIOS_WARNING, "APIC never delivered???\n");
205 printk(BIOS_WARNING, "APIC delivery error (%lx).\n", accept_status);
206 if (send_status || accept_status)
211 /* Number of cpus that are currently running in coreboot */
212 static atomic_t active_cpus = ATOMIC_INIT(1);
214 /* start_cpu_lock covers last_cpu_index and secondary_stack.
215 * Only starting one cpu at a time let's me remove the logic
216 * for select the stack from assembly language.
218 * In addition communicating by variables to the cpu I
219 * am starting allows me to veryify it has started before
223 static spinlock_t start_cpu_lock = SPIN_LOCK_UNLOCKED;
224 static unsigned last_cpu_index = 0;
225 volatile unsigned long secondary_stack;
227 int start_cpu(device_t cpu)
229 extern unsigned char _estack[];
230 struct cpu_info *info;
231 unsigned long stack_end;
232 unsigned long apicid;
237 spin_lock(&start_cpu_lock);
239 /* Get the cpu's apicid */
240 apicid = cpu->path.apic.apic_id;
242 /* Get an index for the new processor */
243 index = ++last_cpu_index;
245 /* Find end of the new processors stack */
246 stack_end = ((unsigned long)_estack) - (CONFIG_STACK_SIZE*index) - sizeof(struct cpu_info);
248 /* Record the index and which cpu structure we are using */
249 info = (struct cpu_info *)stack_end;
253 /* Advertise the new stack to start_cpu */
254 secondary_stack = stack_end;
256 /* Until the cpu starts up report the cpu is not enabled */
258 cpu->initialized = 0;
261 result = lapic_start_cpu(apicid);
265 /* Wait 1s or until the new cpu calls in */
266 for(count = 0; count < 100000 ; count++) {
267 if (secondary_stack == 0) {
275 spin_unlock(&start_cpu_lock);
279 #if CONFIG_AP_IN_SIPI_WAIT == 1
282 * Sending INIT IPI to self is equivalent of asserting #INIT with a bit of delay.
283 * An undefined number of instruction cycles will complete. All global locks
284 * must be released before INIT IPI and no printk is allowed after this.
285 * De-asserting INIT IPI is a no-op on later Intel CPUs.
287 * If you set DEBUG_HALT_SELF to 1, printk's after INIT IPI are enabled
288 * but running thread may halt without releasing the lock and effectively
289 * deadlock other CPUs.
291 #define DEBUG_HALT_SELF 0
294 * Normally this function is defined in lapic.h as an always inline function
295 * that just keeps the CPU in a hlt() loop. This does not work on all CPUs.
296 * I think all hyperthreading CPUs might need this version, but I could only
297 * verify this on the Intel Core Duo
299 void stop_this_cpu(void)
302 unsigned long send_status;
305 id = lapic_read(LAPIC_ID) >> 24;
307 printk(BIOS_DEBUG, "CPU %ld going down...\n", id);
309 /* send an LAPIC INIT to myself */
310 lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(id));
311 lapic_write_around(LAPIC_ICR, LAPIC_INT_LEVELTRIG | LAPIC_INT_ASSERT | LAPIC_DM_INIT);
313 /* wait for the ipi send to finish */
315 printk(BIOS_SPEW, "Waiting for send to finish...\n");
320 printk(BIOS_SPEW, "+");
323 send_status = lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY;
324 } while (send_status && (timeout++ < 1000));
325 if (timeout >= 1000) {
327 printk(BIOS_ERR, "timed out\n");
333 printk(BIOS_SPEW, "Deasserting INIT.\n");
335 /* Deassert the LAPIC INIT */
336 lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(id));
337 lapic_write_around(LAPIC_ICR, LAPIC_INT_LEVELTRIG | LAPIC_DM_INIT);
340 printk(BIOS_SPEW, "Waiting for send to finish...\n");
345 printk(BIOS_SPEW, "+");
348 send_status = lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY;
349 } while (send_status && (timeout++ < 1000));
350 if (timeout >= 1000) {
352 printk(BIOS_ERR, "timed out\n");
363 static __inline__ __attribute__((always_inline)) unsigned long readcr4(void)
366 __asm__ __volatile__ (
367 "mov %%cr4, %[value]"
368 : [value] "=a" (value));
372 static __inline__ __attribute__((always_inline)) void writecr4(unsigned long Data)
374 __asm__ __volatile__ (
382 /* C entry point of secondary cpus */
383 void secondary_cpu_init(void)
385 atomic_inc(&active_cpus);
386 #if CONFIG_SERIAL_CPU_INIT == 1
387 #if CONFIG_MAX_CPUS>2
388 spin_lock(&start_cpu_lock);
394 * Seems that CR4 was cleared when AP start via lapic_start_cpu()
395 * Turn on CR4.OSFXSR and CR4.OSXMMEXCPT when SSE options enabled
399 cr4_val |= (1 << 9 | 1 << 10);
403 #if CONFIG_SERIAL_CPU_INIT == 1
404 #if CONFIG_MAX_CPUS>2
405 spin_unlock(&start_cpu_lock);
409 atomic_dec(&active_cpus);
414 static void start_other_cpus(struct bus *cpu_bus, device_t bsp_cpu)
417 /* Loop through the cpus once getting them started */
419 for(cpu = cpu_bus->children; cpu ; cpu = cpu->sibling) {
420 if (cpu->path.type != DEVICE_PATH_APIC) {
423 #if CONFIG_SERIAL_CPU_INIT == 0
433 if (cpu->initialized) {
437 if (!start_cpu(cpu)) {
438 /* Record the error in cpu? */
439 printk(BIOS_ERR, "CPU 0x%02x would not start!\n",
440 cpu->path.apic.apic_id);
442 #if CONFIG_SERIAL_CPU_INIT == 1
443 #if CONFIG_MAX_CPUS>2
451 static void wait_other_cpus_stop(struct bus *cpu_bus)
454 int old_active_count, active_count;
455 /* Now loop until the other cpus have finished initializing */
456 old_active_count = 1;
457 active_count = atomic_read(&active_cpus);
458 while(active_count > 1) {
459 if (active_count != old_active_count) {
460 printk(BIOS_INFO, "Waiting for %d CPUS to stop\n", active_count - 1);
461 old_active_count = active_count;
464 active_count = atomic_read(&active_cpus);
466 for(cpu = cpu_bus->children; cpu; cpu = cpu->sibling) {
467 if (cpu->path.type != DEVICE_PATH_APIC) {
470 if (!cpu->initialized) {
471 printk(BIOS_ERR, "CPU 0x%02x did not initialize!\n",
472 cpu->path.apic.apic_id);
475 printk(BIOS_DEBUG, "All AP CPUs stopped\n");
478 #else /* CONFIG_SMP */
479 #define initialize_other_cpus(root) do {} while(0)
480 #endif /* CONFIG_SMP */
482 void initialize_cpus(struct bus *cpu_bus)
484 struct device_path cpu_path;
485 struct cpu_info *info;
487 /* Find the info struct for this cpu */
491 /* Ensure the local apic is enabled */
494 /* Get the device path of the boot cpu */
495 cpu_path.type = DEVICE_PATH_APIC;
496 cpu_path.apic.apic_id = lapicid();
498 /* Get the device path of the boot cpu */
499 cpu_path.type = DEVICE_PATH_CPU;
503 /* Find the device structure for the boot cpu */
504 info->cpu = alloc_find_dev(cpu_bus, &cpu_path);
507 copy_secondary_start_to_1m_below(); // why here? In case some day we can start core1 in amd_sibling_init
510 #if CONFIG_HAVE_SMI_HANDLER
514 cpus_ready_for_init();
517 #if CONFIG_SERIAL_CPU_INIT == 0
518 /* start all aps at first, so we can init ECC all together */
519 start_other_cpus(cpu_bus, info->cpu);
523 /* Initialize the bootstrap processor */
527 #if CONFIG_SERIAL_CPU_INIT == 1
528 start_other_cpus(cpu_bus, info->cpu);
531 /* Now wait the rest of the cpus stop*/
532 wait_other_cpus_stop(cpu_bus);