PERFORCE change 42509 for review
Peter Wemm
peter at FreeBSD.org
Sat Nov 15 19:31:01 PST 2003
http://perforce.freebsd.org/chv.cgi?CH=42509
Change 42509 by peter at peter_overcee on 2003/11/15 19:30:12
create AP bootstrap page tables
Affected files ...
.. //depot/projects/hammer/sys/amd64/amd64/mp_machdep.c#30 edit
Differences ...
==== //depot/projects/hammer/sys/amd64/amd64/mp_machdep.c#30 (text+ko) ====
@@ -454,7 +454,8 @@
u_char mpbiosreason;
u_int32_t mpbioswarmvec;
struct pcpu *pc;
- int x, apic_id, cpu;
+ int x, apic_id, cpu, i;
+ u_int64_t *pt4, *pt3, *pt2;
mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
@@ -462,6 +463,28 @@
pmap_kenter(boot_address + KERNBASE, boot_address);
bcopy(mptramp_start, (void *)((uintptr_t)boot_address + KERNBASE), bootMP_size);
+ /* Locate the page tables, they'll be below the trampoline */
+ pt4 = (u_int64_t *)(uintptr_t)mptramp_pagetables;
+ pt3 = pt4 + 512;
+ pt2 = pt3 + 512;
+ printf("pt4 = %p; pt3 = %p; pt2 = %p\n", pt4, pt3, pt2);
+
+ /* Create the initial 1GB replicated page tables */
+ for (i = 0; i < 512; i++) {
+ /* Each slot of the level 4 pages points to the same level 3 page */
+ pt4[i] = (u_int64_t)(uintptr_t)pt3;
+ pt4[i] = PG_V | PG_RW | PG_U;
+
+ /* Each slot of the level 3 pages points to the same level 2 page */
+ pt3[i] = (u_int64_t)(uintptr_t)pt2;
+ pt3[i] = PG_V | PG_RW | PG_U;
+
+ /* The level 2 page slots are mapped with 2MB pages for 1GB. */
+ pt2[i] = i * (2 * 1024 * 1024);
+ pt2[i] = PG_V | PG_RW | PG_PS | PG_U;
+ }
+ printf("pagetables created\n");
+
/* save the current value of the warm-start vector */
mpbioswarmvec = *((u_int32_t *) WARMBOOT_OFF);
outb(CMOS_REG, BIOS_RESET);
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