svn commit: r270081 - head/sys/arm/include
ian at FreeBSD.org
Sun Aug 17 02:56:59 UTC 2014
Date: Sun Aug 17 02:56:58 2014
New Revision: 270081
When the initarm_* routines were renamed to platform_* and moved to their
own header file, the lovely block of comments explaining what the generic
init code expects of the soc implementations got lost, restore it.
--- head/sys/arm/include/platform.h Sun Aug 17 02:53:36 2014 (r270080)
+++ head/sys/arm/include/platform.h Sun Aug 17 02:56:58 2014 (r270081)
@@ -29,6 +29,34 @@
+ * Initialization functions called by the common initarm() function in
+ * arm/machdep.c (but not necessarily from the custom initarm() functions of
+ * older code).
+ * - platform_probe_and_attach() is called very early, after parsing the boot
+ * params and after physical memory has been located and sized.
+ * - platform_devmap_init() is called as one of the last steps of early virtual
+ * memory initialization, shortly before the new page tables are installed.
+ * - platform_lastaddr() is called after platform_devmap_init(), and must return
+ * the address of the first byte of unusable KVA space. This allows a
+ * platform to carve out of the top of the KVA space whatever reserves it
+ * needs for things like static device mapping, and this is called to get the
+ * value before calling pmap_bootstrap() which uses the value to size the
+ * available KVA.
+ * - platform_gpio_init() is called after the static device mappings are
+ * established and just before cninit(). The intention is that the routine
+ * can do any hardware setup (such as gpio or pinmux) necessary to make the
+ * console functional.
+ * - platform_late_init() is called just after cninit(). This is the first of
+ * the init routines that can use printf() and expect the output to appear on
+ * a standard console.
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