L1 memory support for the Blackfin. A couple new syscalls to manage L1

allocations, dma_memcpy to move stuff between L1 and main memory, and a new
structure to describe the global data in L1 scratchpad memory.

1 files changed, 17 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/bfin/bfin_l1layout.h b/libc/sysdeps/linux/bfin/bfin_l1layout.h
new file mode 100644
index 000000000..00efd2358
--- /dev/null
+++ b/libc/sysdeps/linux/bfin/bfin_l1layout.h
@@ -0,0 +1,17 @@
+#define L1_SCRATCH_START	0xFFB00000
+
+/* Data that is "mapped" into the process VM at the start of the L1 scratch
+   memory, so that each process can access it at a fixed address.  Used for
+   stack checking.  */
+struct l1_scratch_task_info
+{
+	/* Points to the start of the stack.  */
+	void *stack_start;
+	/* Not updated by the kernel; a user process can modify this to
+	   keep track of the lowest address of the stack pointer during its
+	   runtime.  */
+	void *lowest_sp;
+};
+
+/* A pointer to the structure in memory.  */
+#define L1_SCRATCH_TASK_INFO ((struct l1_scratch_task_info *)L1_SCRATCH_START)