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authorRichard Kuo <rkuo@codeaurora.org>2013-03-22 16:05:40 -0500
committerRichard Kuo <rkuo@codeaurora.org>2013-04-30 19:40:22 -0500
commit8f5a0b9dffeb3cb94f2b0622b6fe0717512ef54b (patch)
treed85d4b7531645b4b189fb88dd8d6b4b62072284b /arch/hexagon/kernel
parente0025a72c37ca404fbf31d569439c20bfb04295e (diff)
downloadlinux-linaro-stable-8f5a0b9dffeb3cb94f2b0622b6fe0717512ef54b.tar.gz
Hexagon: add support for ARCH_PFN_OFFSET
Add support for loading the kernel at a physical offset. The offset should still be 4M aligned. Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Diffstat (limited to 'arch/hexagon/kernel')
-rw-r--r--arch/hexagon/kernel/head.S22
-rw-r--r--arch/hexagon/kernel/setup.c2
-rw-r--r--arch/hexagon/kernel/vmlinux.lds.S10
3 files changed, 22 insertions, 12 deletions
diff --git a/arch/hexagon/kernel/head.S b/arch/hexagon/kernel/head.S
index d859402c73ba..477320c455f7 100644
--- a/arch/hexagon/kernel/head.S
+++ b/arch/hexagon/kernel/head.S
@@ -43,14 +43,21 @@ ENTRY(stext)
* Symbol is kernel segment address, but we need
* the logical/physical address.
*/
- r24 = asl(r24, #2)
- r24 = lsr(r24, #2)
+ r25 = pc;
+ r2.h = #0xffc0;
+ r2.l = #0x0000;
+ r25 = and(r2,r25); /* R25 holds PHYS_OFFSET now */
+ r1.h = #HI(PAGE_OFFSET);
+ r1.l = #LO(PAGE_OFFSET);
+ r24 = sub(r24,r1); /* swapper_pg_dir - PAGE_OFFSET */
+ r24 = add(r24,r25); /* + PHYS_OFFSET */
- r0 = r24
+ r0 = r24; /* aka __pa(swapper_pg_dir) */
/*
- * Initialize a 16MB PTE to make the virtual and physical
+ * Initialize page dir to make the virtual and physical
* addresses where the kernel was loaded be identical.
+ * Done in 4MB chunks.
*/
#define PTE_BITS ( __HVM_PTE_R | __HVM_PTE_W | __HVM_PTE_X \
| __HEXAGON_C_WB_L2 << 6 \
@@ -143,6 +150,13 @@ __head_s_vaddr_target:
r2 = sub(r2,r0);
call memset;
+ /* Set PHYS_OFFSET; should still be in R25 */
+#ifdef CONFIG_HEXAGON_PHYS_OFFSET
+ r0.l = #LO(__phys_offset);
+ r0.h = #HI(__phys_offset);
+ memw(r0) = r25;
+#endif
+
/* Time to make the doughnuts. */
call start_kernel
diff --git a/arch/hexagon/kernel/setup.c b/arch/hexagon/kernel/setup.c
index 94a387835008..2e2304f7b7ee 100644
--- a/arch/hexagon/kernel/setup.c
+++ b/arch/hexagon/kernel/setup.c
@@ -68,6 +68,8 @@ void __init setup_arch(char **cmdline_p)
*/
__vmsetvec(_K_VM_event_vector);
+ printk(KERN_INFO "PHYS_OFFSET=0x%08x\n", PHYS_OFFSET);
+
/*
* Simulator has a few differences from the hardware.
* For now, check uninitialized-but-mapped memory
diff --git a/arch/hexagon/kernel/vmlinux.lds.S b/arch/hexagon/kernel/vmlinux.lds.S
index 14e793f6abbf..fafb886511e3 100644
--- a/arch/hexagon/kernel/vmlinux.lds.S
+++ b/arch/hexagon/kernel/vmlinux.lds.S
@@ -18,8 +18,6 @@
* 02110-1301, USA.
*/
-#define LOAD_OFFSET PAGE_OFFSET
-
#include <asm-generic/vmlinux.lds.h>
#include <asm/asm-offsets.h> /* Most of the kernel defines are here */
#include <asm/mem-layout.h> /* except for page_offset */
@@ -36,13 +34,9 @@ See asm-generic/sections.h for seemingly required labels.
#define PAGE_SIZE _PAGE_SIZE
-/* This LOAD_OFFSET is temporary for debugging on the simulator; it may change
- for hypervisor pseudo-physical memory. */
-
-
SECTIONS
{
- . = PAGE_OFFSET + LOAD_ADDRESS;
+ . = PAGE_OFFSET;
__init_begin = .;
HEAD_TEXT_SECTION
@@ -52,7 +46,7 @@ SECTIONS
. = ALIGN(_PAGE_SIZE);
_stext = .;
- .text : AT(ADDR(.text) - LOAD_OFFSET) {
+ .text : AT(ADDR(.text)) {
_text = .;
TEXT_TEXT
SCHED_TEXT