Implement a facility for dynamic per-cpu variables.

 - Modules and kernel code alike may use DPCPU_DEFINE(),
   DPCPU_GET(), DPCPU_SET(), etc. akin to the statically defined
   PCPU_*.  Requires only one extra instruction more than PCPU_* and is
   virtually the same as __thread for builtin and much faster for shared
   objects.  DPCPU variables can be initialized when defined.
 - Modules are supported by relocating the module's per-cpu linker set
   over space reserved in the kernel.  Modules may fail to load if there
   is insufficient space available.
 - Track space available for modules with a one-off extent allocator.
   Free may block for memory to allocate space for an extent.

Reviewed by:    jhb, rwatson, kan, sam, grehan, marius, marcel, stas

1 files changed, 5 insertions, 0 deletions

diff --git a/sys/arm/xscale/i80321/ep80219_machdep.c b/sys/arm/xscale/i80321/ep80219_machdep.c
index 77fad07..ed77995 100644
--- a/sys/arm/xscale/i80321/ep80219_machdep.c
+++ b/sys/arm/xscale/i80321/ep80219_machdep.c
@@ -186,6 +186,7 @@ void *
 initarm(void *arg, void *arg2)
 {
 	struct pv_addr  kernel_l1pt;
+	struct pv_addr  dpcpu;
 	int loop, i;
 	u_int l1pagetable;
 	vm_offset_t freemempos;
@@ -236,6 +237,10 @@ initarm(void *arg, void *arg2)
 	 */
 	valloc_pages(systempage, 1);
 
+	/* Allocate dynamic per-cpu area. */
+	valloc_pages(dpcpu, DPCPU_SIZE / PAGE_SIZE);
+	dpcpu_init((void *)dpcpu.pv_va, 0);
+
 	/* Allocate stacks for all modes */
 	valloc_pages(irqstack, IRQ_STACK_SIZE);
 	valloc_pages(abtstack, ABT_STACK_SIZE);