Author: cognet
Date: Thu May 29 16:54:15 2014
New Revision: 266849
URL: http://svnweb.freebsd.org/changeset/base/266849
Log:
For old CPUs, map the 64 first MB of RAM as it used to be. Some ports
(XScale mainly) expects the memory located before the kernel to be mapped,
and use it to allocate the page tables, the various stacks, etc.
A better fix would probably be to rewrite the various bla_machdep.c to stop
using that RAM, but I'm not so inclined to do it, especially since I don't
have hardware for all of them.
Modified:
head/sys/arm/arm/locore.S
Modified: head/sys/arm/arm/locore.S
==============================================================================
--- head/sys/arm/arm/locore.S Thu May 29 16:20:34 2014 (r266848)
+++ head/sys/arm/arm/locore.S Thu May 29 16:54:15 2014 (r266849)
@@ -166,9 +166,32 @@ Lunmapped:
ldr r1, [r0, #4]
sub r0, r1, r2
+#ifndef _ARM_ARCH_6
/*
- * Map PA == VA
+ * Some of the older ports (the various XScale, mostly) assume
+ * that the memory before the kernel is mapped, and use it for
+ * the various stacks, page tables, etc. For those CPUs, map the
+ * 64 first MB of RAM, as it used to be.
*/
+ /*
+ * Map PA == VA
+ */
+ ldr r5, =PHYSADDR
+ mov r1, r5
+ mov r2, r5
+ /* Map 64MiB, preserved over calls to build_pagetables */
+ mov r3, #64
+ bl build_pagetables
+
+ /* Create the kernel map to jump to */
+ mov r1, r5
+ ldr r2, =(KERNBASE)
+ bl build_pagetables
+ ldr r5, =(KERNPHYSADDR)
+#else
+ /*
+ * Map PA == VA
+ */
/* Find the start kernels load address */
adr r5, _start
ldr r2, =(L1_S_OFFSET)
@@ -183,6 +206,7 @@ Lunmapped:
mov r1, r5
ldr r2, =(KERNVIRTADDR)
bl build_pagetables
+#endif
#if defined(SOCDEV_PA) && defined(SOCDEV_VA)
/* Create the custom map */
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