sparc: move kernel to a lower address

The openboot mmu code does not like addresses above 4GB, so load the kernel to a lower address. It doesn't really matter anyway, because on sparc the kernel normally lives in a separate address space and uses special instructions to access userland memory. See #19597 for details, further changes will be needed here. Change-Id: Iac6901f275667efef5e64d059daf4c96032a7baf Reviewed-on: https://review.haiku-os.org/c/haiku/+/3573 Reviewed-by: Adrien Destugues <[email protected]> Tested-by: Commit checker robot <[email protected]>
2025-06-11 06:40:13 +00:00
parent 5ac839cb94
commit 26bedc8f4e
2 changed files with 6 additions and 2 deletions
@@ -9,7 +9,11 @@
 #include <arch/cpu.h>

 // memory layout
-#define KERNEL_LOAD_BASE_64_BIT 0xffffffff80000000ll
+// FIXME: On sparc, the kernel should live in an independent address space,
+// and does not share addresses with userspace. So, a lot of this doesn't
+// really make sense. See #19597 for discussion.
+// The consequence is that IS_USER_MEMORY cannot work in the way we need.
+#define KERNEL_LOAD_BASE_64_BIT 0x80000000ll

 // Base of the kernel address space.
 // KERNEL_BASE is the base of the kernel address space. This differs from the